From c2a1e4474cf12fe48774ec6cf274367abc8bd02b Mon Sep 17 00:00:00 2001
From: sunghee-hwang <97494915+sunghee-hwang@users.noreply.github.com>
Date: Mon, 21 Aug 2023 00:51:12 +0000
Subject: [PATCH] Merge pull request #705 from
 felicialim/662-improve-terminology

SHA: b07e6d675e9b928f59541d5b45a1f8ab494c9520
Reason: push, by sunghee-hwang

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 222 ++++++++++++++++++++++++++---------------------------
 1 file changed, 107 insertions(+), 115 deletions(-)

diff --git a/index.html b/index.html
index 25358eea..ac6f690d 100644
--- a/index.html
+++ b/index.html
@@ -1490,7 +1490,7 @@
 </style>
   <meta content="Bikeshed version 6edc88947, updated Thu Aug 17 11:18:09 2023 -0700" name="generator">
   <link href="https://aomediacodec.github.io/iamf/" rel="canonical">
-  <meta content="bf0b428a4ec37f756f7d7018c39b4f505aa0b7e2" name="document-revision">
+  <meta content="b07e6d675e9b928f59541d5b45a1f8ab494c9520" name="document-revision">
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -2038,7 +2038,7 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
     <li>
      <a href="#iamodel"><span class="secno">2</span> <span class="content">Immersive Audio Model</span></a>
      <ol class="toc">
-      <li><a href="#terminology"><span class="secno">2.1</span> <span class="content">Terminology</span></a>
+      <li><a href="#model-overview"><span class="secno">2.1</span> <span class="content">Model Overview</span></a>
       <li><a href="#architecture"><span class="secno">2.2</span> <span class="content">Architecture</span></a>
       <li>
        <a href="#bitstream"><span class="secno">2.3</span> <span class="content">Bitstream Structure</span></a>
@@ -2226,7 +2226,7 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
         <li><a href="#iamfgeneration-scalablechannelaudio-downmixmechanism"><span class="secno">10.2.2</span> <span class="content">Annex B-2: Down-mix Mechanism</span></a>
         <li><a href="#iamfgeneration-scalablechannelaudio-channellayoutgenerationrule"><span class="secno">10.2.3</span> <span class="content">Annex B-3: Channel Layout Generation Rule</span></a>
         <li><a href="#iamfgeneration-scalablechannelaudio-recongaingeneration"><span class="secno">10.2.4</span> <span class="content">Annex B-4: Recon Gain Generation</span></a>
-        <li><a href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"><span class="secno">10.2.5</span> <span class="content">Annex B-5: ChannelGroup Generation Rule</span></a>
+        <li><a href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"><span class="secno">10.2.5</span> <span class="content">Annex B-5: Channel Group Generation Rule</span></a>
        </ol>
      </ol>
     <li><a href="#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
@@ -2246,14 +2246,8 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
   </nav>
   <main>
    <h2 class="heading settled" data-level="1" id="introduction"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#introduction"></a></h2>
-   <p>This specification defines an immersive audio model and formats (IAMF) to provide an immersive audio experience to end-users.</p>
-   <ul>
-    <li data-md>
-     <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="immersive-audio">Immersive Audio</dfn> (IA) means the combination of <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal">3D audio signal</a>s recreating a sound experience close to that of a natural environment.</p>
-    <li data-md>
-     <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="3d-audio-signal">3D audio signal</dfn> means a representation of sound that incorporates additional information beyond traditional stereo or surround sound formats such as Ambisonics (Scene-based), Object-based audio and Channel-based audio (e.g., 3.1.2ch or 7.1.4ch).</p>
-   </ul>
-   <p>IAMF is used to provide <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio">Immersive Audio</a> content for presentation on a wide range of devices in both streaming and offline applications. These applications include internet audio streaming, multicasting/broadcasting services, file download, gaming, communication, virtual and augmented reality, and others. In these applications, audio may be played back on a wide range of devices, e.g., headphones, mobile phones, tablets, TVs, sound bars, home theater systems, and big screens.</p>
+   <p>This specification defines an immersive audio model and formats (IAMF) to provide an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio">Immersive Audio</a> experience to end-users.</p>
+   <p>IAMF is used to provide <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio①">Immersive Audio</a> content for presentation on a wide range of devices in both streaming and offline applications. These applications include internet audio streaming, multicasting/broadcasting services, file download, gaming, communication, virtual and augmented reality, and others. In these applications, audio may be played back on a wide range of devices, e.g., headphones, mobile phones, tablets, TVs, sound bars, home theater systems, and big screens.</p>
    <p>Here are some typical IAMF use cases and examples of how to instantiate the model for the use cases.</p>
    <ul>
     <li data-md>
@@ -2263,23 +2257,23 @@ <h2 class="heading settled" data-level="1" id="introduction"><span class="secno"
     <li data-md>
      <p>UC3: Two <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element②">Audio Element</a>s (e.g., FOA and Non-diegetic Stereo) are delivered to a mobile device through a unicast network. FOA is rendered to Binaural (or Stereo) and Non-diegetic is rendered to Stereo. After mixing them, it is processed with loudness normalization and is played back on headphones through the mobile device.</p>
    </ul>
-   <p>Example 1: UC1 with <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①">3D audio signal</a> = 3.1.2ch.</p>
+   <p>Example 1: UC1 with <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal">3D audio signal</a> = 3.1.2ch.</p>
    <ul>
     <li data-md>
      <p>Audio Substream: The left (L) and right (R) channels are coded as one audio stream, the left top front (Ltf) and right top front (Rtf) channels as one audio stream, the Center channel as one audio stream, and the low-frequency effects (LFE) channel as one audio stream.</p>
     <li data-md>
-     <p>Audio Element (3.1.2ch): Consists of 4 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup">ChannelGroup</a>.</p>
+     <p>Audio Element (3.1.2ch): Consists of 4 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group">Channel Group</a>.</p>
     <li data-md>
-     <p>Mix Presentation: Provides rendering algorithms for rendering the Audio Element to popular loudspeaker layouts and headphones, and the loudness information of the <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②">3D audio signal</a>.</p>
+     <p>Mix Presentation: Provides rendering algorithms for rendering the Audio Element to popular loudspeaker layouts and headphones, and the loudness information of the <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①">3D audio signal</a>.</p>
    </ul>
-   <p>Example 2: UC2 with two <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal③">3D audio signal</a>s = 5.1.2ch and Stereo.</p>
+   <p>Example 2: UC2 with two <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②">3D audio signal</a>s = 5.1.2ch and Stereo.</p>
    <ul>
     <li data-md>
      <p>Audio Substream: The L and R channels are coded as one audio stream, the left surround (Ls) and right surround (Rs) channels as one audio stream, the Ltf and Rtf channels as one audio stream, the Center channel as one audio stream, and the LFE channel as one audio stream.</p>
     <li data-md>
-     <p>Audio Element 1 (5.1.2ch): Consists of 5 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①">ChannelGroup</a>.</p>
+     <p>Audio Element 1 (5.1.2ch): Consists of 5 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①">Channel Group</a>.</p>
     <li data-md>
-     <p>Audio Element 2 (Stereo): Consists of 1 Audio Substream which is grouped into one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②">ChannelGroup</a>.</p>
+     <p>Audio Element 2 (Stereo): Consists of 1 Audio Substream which is grouped into one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②">Channel Group</a>.</p>
     <li data-md>
      <p>Parameter Substream 1-1: Contains mixing parameter values that are applied to Audio Element 1 by considering the home environment.</p>
     <li data-md>
@@ -2287,14 +2281,14 @@ <h2 class="heading settled" data-level="1" id="introduction"><span class="secno"
     <li data-md>
      <p>Mix Presentation: Provides rendering algorithms for rendering Audio Elements 1 &amp; 2 to popular loudspeaker layouts, mixing information based on Parameter Substreams 1-1 &amp; 1-2, and loudness information of the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation①">Rendered Mix Presentation</a>.</p>
    </ul>
-   <p>Example 3: UC3 with two <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal④">3D audio signal</a>s = first order Ambisonics (FOA) and Non-diegetic Stereo.</p>
+   <p>Example 3: UC3 with two <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal③">3D audio signal</a>s = first order Ambisonics (FOA) and Non-diegetic Stereo.</p>
    <ul>
     <li data-md>
      <p>Audio Substream: The L and R channels are coded as one audio stream and each channel of the FOA signal as one audio stream.</p>
     <li data-md>
-     <p>Audio Element 1 (FOA): Consists of 4 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③">ChannelGroup</a>.</p>
+     <p>Audio Element 1 (FOA): Consists of 4 Audio Substreams which are grouped into one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③">Channel Group</a>.</p>
     <li data-md>
-     <p>Audio Element 2 (Non-diegetic Stereo): Consists of 1 Audio Substream which is grouped into one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④">ChannelGroup</a>.</p>
+     <p>Audio Element 2 (Non-diegetic Stereo): Consists of 1 Audio Substream which is grouped into one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④">Channel Group</a>.</p>
     <li data-md>
      <p>Parameter Substream 1-1: Contains mixing parameter values that are applied to Audio Element 1 by considering the mobile environment.</p>
     <li data-md>
@@ -2303,23 +2297,21 @@ <h2 class="heading settled" data-level="1" id="introduction"><span class="secno"
      <p>Mix Presentation: Provides rendering algorithms for rendering Audio Elements 1 &amp; 2 to popular loudspeaker layouts and headphones, mixing information based on Parameter Substreams 1-1 &amp; 1-2, and loudness information of the <a data-link-type="dfn" href="#rendered-mix-presentation" id="ref-for-rendered-mix-presentation②">Rendered Mix Presentation</a>.</p>
    </ul>
    <h2 class="heading settled" data-level="2" id="iamodel"><span class="secno">2. </span><span class="content">Immersive Audio Model</span><a class="self-link" href="#iamodel"></a></h2>
-   <p>This specification defines a model for representing <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio①">Immersive Audio</a> contents based on <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream">Audio Substream</a>s contributing to <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③">Audio Element</a>s meant to be rendered and mixed to form one or more presentations as depicted in the figure below.</p>
+   <h3 class="heading settled" data-level="2.1" id="model-overview"><span class="secno">2.1. </span><span class="content">Model Overview</span><a class="self-link" href="#model-overview"></a></h3>
+   <p>This specification defines a model for representing <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio②">Immersive Audio</a> contents based on <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream">Audio Substream</a>s contributing to <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③">Audio Element</a>s meant to be rendered and mixed to form one or more presentations as depicted in the figure below.</p>
    <center><img src="images/decoding_flow_cropped.svg" width="800"></center>
    <center>
     <figcaption>Processing flow to decode, reconstruct, render, and mix the 3D audio signals for immersive audio playback.</figcaption>
    </center>
    <p>The model comprises a number of coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①">Audio Substream</a>s and the metadata that describes how to decode, render and mix the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream②">Audio Substream</a>s for playback. The model itself is codec-agnostic; any supported audio codec may be used to code the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream③">Audio Substream</a>s.</p>
-   <p>The model includes one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④">Audio Element</a>s, each of which consists of one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④">Audio Substream</a>s. The <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤">Audio Substream</a>s that make up an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤">Audio Element</a> are grouped into one or more <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤">ChannelGroup</a>s. The model further includes <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation">Mix Presentation</a>s and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream">Parameter Substream</a>s.</p>
-   <h3 class="heading settled" data-level="2.1" id="terminology"><span class="secno">2.1. </span><span class="content">Terminology</span><a class="self-link" href="#terminology"></a></h3>
+   <p>The model includes one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④">Audio Element</a>s, each of which consists of one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④">Audio Substream</a>s. The <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤">Audio Substream</a>s that make up an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑤">Audio Element</a> are grouped into one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤">Channel Group</a>s. The model further includes <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation">Mix Presentation</a>s and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream">Parameter Substream</a>s.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="3d-audio-signal">3D audio signal</dfn> means a representation of sound that incorporates additional information beyond traditional stereo or surround sound formats such as Ambisonics (Scene-based), Object-based audio and Channel-based audio (e.g., 3.1.2ch or 7.1.4ch).</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="immersive-audio">Immersive Audio</dfn> (IA) means the combination of <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal④">3D audio signal</a>s recreating a sound experience close to that of a natural environment.</p>
    <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-substream">Audio Substream</dfn> means a sequence of audio samples, which may be encoded with any compatible audio codec.</p>
-   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-element">Audio Element</dfn> means a <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal⑤">3D audio signal</a>, and is constructed from one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥">Audio Substream</a>s and the metadata describing them. The <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦">Audio Substream</a>s associated with one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥">Audio Element</a> use the same audio codec.</p>
-   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channelgroup">ChannelGroup</dfn> means a set of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧">Audio Substream</a>(s) which is(are) able to provide a spatial resolution of audio contents by itself or which is(are) able to provide an enhanced spatial resolution of audio contents by combining with the preceding <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥">ChannelGroup</a>s.</p>
-   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="parameter-substream">Parameter Substream</dfn> means a sequence of parameter values that are associated with the algorithms used for reconstructing, rendering, and mixing. It is applied to its associated <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦">Audio Element</a> or <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①">Mix Presentation</a>.</p>
-   <ul>
-    <li data-md>
-     <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①">Parameter Substream</a>s may change their values over time and may further be animated; for example, any changes in values may be smoothed over some time duration. As such, they may be viewed as a 1D signal with different metadata specified for different time durations.</p>
-   </ul>
-   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation">Mix Presentation</dfn> means a series of processes to present <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio②">Immersive Audio</a> contents to end-users by using <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧">Audio Element</a>(s). It contains metadata that describes how the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨">Audio Element</a>(s) is(are) rendered and mixed together for playback through physical loudspeakers or headphones, and loudness information.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel-group">Channel Group</dfn> means a set of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥">Audio Substream</a>(s) which is(are) able to provide a spatial resolution of audio contents by itself or which is(are) able to provide an enhanced spatial resolution of audio contents by combining with the preceding <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥">Channel Group</a>s.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-element">Audio Element</dfn> means a <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal⑤">3D audio signal</a>, and is constructed from one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑦">Audio Substream</a>s (grouped into one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦">Channel Groups</a>) and the metadata describing them. The <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧">Audio Substream</a>s associated with one <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑥">Audio Element</a> use the same audio codec.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation">Mix Presentation</dfn> means a series of processes to present <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio③">Immersive Audio</a> contents to end-users by using <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑦">Audio Element</a>(s). It contains metadata that describes how the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧">Audio Element</a>(s) is(are) rendered and mixed together for playback through physical loudspeakers or headphones, as well as loudness information.</p>
+   <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="parameter-substream">Parameter Substream</dfn> means a sequence of parameter values that are associated with the algorithms used for reconstructing, rendering, and mixing. It is applied to its associated <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑨">Audio Element</a> or <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation①">Mix Presentation</a>. <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①">Parameter Substream</a>s may change their values over time and may further be animated; for example, any changes in values may be smoothed over some time duration. As such, they may be viewed as a 1D signal with different metadata specified for different time durations.</p>
    <p>The term <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rendered-mix-presentation">Rendered Mix Presentation</dfn> means a <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal⑥">3D audio signal</a> after the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪">Audio Element</a>(s) defined in a <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation②">Mix Presentation</a> is(are) rendered and mixed together for playback through physical loudspeakers or headphones.</p>
    <h3 class="heading settled" data-level="2.2" id="architecture"><span class="secno">2.2. </span><span class="content">Architecture</span><a class="self-link" href="#architecture"></a></h3>
    <p>Based on the model, this specification defines the immersive audio model and format (<dfn data-dfn-type="dfn" data-noexport id="iamf">IAMF<a class="self-link" href="#iamf"></a></dfn>) architecture as depicted in the figure below.</p>
@@ -2330,7 +2322,7 @@ <h3 class="heading settled" data-level="2.2" id="architecture"><span class="secn
    <p>For a given input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal⑦">3D audio signal</a>,</p>
    <ul>
     <li data-md>
-     <p>A Pre-Processor generates <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦">ChannelGroup</a>(s), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②">Parameter Substream</a>(s).</p>
+     <p>A Pre-Processor generates <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧">Channel Group</a>(s), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream②">Parameter Substream</a>(s).</p>
     <li data-md>
      <p>A Codec Enc generates coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑨">Audio Substream</a>(s).</p>
     <li data-md>
@@ -2342,11 +2334,11 @@ <h3 class="heading settled" data-level="2.2" id="architecture"><span class="secn
     <li data-md>
      <p>An OBU Parser outputs the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①①">Audio Substream</a>(s) and the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④">Parameter Substream</a>(s).</p>
     <li data-md>
-     <p>A Codec Dec outputs decoded <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧">ChannelGroup</a>(s) after decoding of the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①②">Audio Substream</a>(s).</p>
+     <p>A Codec Dec outputs decoded <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨">Channel Group</a>(s) after decoding of the coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①②">Audio Substream</a>(s).</p>
     <li data-md>
-     <p>A Post-Processor outputs an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio③">Immersive Audio</a> by using the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨">ChannelGroup</a>(s), the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②">Descriptors</a> and the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑤">Parameter Substream</a>(s).</p>
+     <p>A Post-Processor outputs an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio④">Immersive Audio</a> by using the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⓪">Channel Group</a>(s), the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②">Descriptors</a> and the <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream⑤">Parameter Substream</a>(s).</p>
     <li data-md>
-     <p>Pre-Processor, <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⓪">ChannelGroup</a>(s), Codec Enc and OBU Packetizer are defined in <a href="#iamfgeneration">§ 8 IAMF Generation Process (Informative)</a>.</p>
+     <p>Pre-Processor, <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①①">Channel Group</a>(s), Codec Enc and OBU Packetizer are defined in <a href="#iamfgeneration">§ 8 IAMF Generation Process (Informative)</a>.</p>
     <li data-md>
      <p><a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence③">IA Sequence</a> is defined in <a href="#iasequence">§ 2.3.1 IA Sequence</a>.</p>
     <li data-md>
@@ -2356,7 +2348,7 @@ <h3 class="heading settled" data-level="2.2" id="architecture"><span class="secn
    </ul>
    <h3 class="heading settled" data-level="2.3" id="bitstream"><span class="secno">2.3. </span><span class="content">Bitstream Structure</span><a class="self-link" href="#bitstream"></a></h3>
    <h4 class="heading settled" data-level="2.3.1" id="iasequence"><span class="secno">2.3.1. </span><span class="content">IA Sequence</span><a class="self-link" href="#iasequence"></a></h4>
-   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④">IA Sequence</a> is a bitstream to represent <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio④">Immersive Audio</a> contents and consists of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data">IA Data</a>.</p>
+   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence④">IA Sequence</a> is a bitstream to represent <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑤">Immersive Audio</a> contents and consists of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data">IA Data</a>.</p>
    <p>The metadata in the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors④">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data①">IA Data</a> are packetized into individual Open Bitstream Units (OBU)s. The term Open Bitstream Unit (OBU) is the concrete, physical unit used to represent the components in the model.</p>
    <h4 class="heading settled" data-level="2.3.2" id="use-of-obu"><span class="secno">2.3.2. </span><span class="content">Use of OBU</span><a class="self-link" href="#use-of-obu"></a></h4>
    <h5 class="heading settled" data-level="2.3.2.1" id="bitstream-descriptors"><span class="secno">2.3.2.1. </span><span class="content">Descriptors</span><a class="self-link" href="#bitstream-descriptors"></a></h5>
@@ -2369,14 +2361,14 @@ <h5 class="heading settled" data-level="2.3.2.1" id="bitstream-descriptors"><spa
     <li data-md>
      <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-element-obu">Audio Element OBU</dfn> provides information to combine one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①④">Audio Substream</a>s to reconstruct an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①">Audio Element</a>.</p>
     <li data-md>
-     <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation-obu">Mix Presentation OBU</dfn> provides information to render and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②">Audio Element</a>s to generate the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑤">Immersive Audio</a> output.</p>
+     <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="mix-presentation-obu">Mix Presentation OBU</dfn> provides information to render and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①②">Audio Element</a>s to generate the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑥">Immersive Audio</a> output.</p>
      <ul>
       <li data-md>
        <p>Multiple <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation③">Mix Presentation</a>s can be defined as alternatives to each other within the same <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥">IA Sequence</a>. Furthermore, the choice of which <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation④">Mix Presentation</a> to use at playback is left to the user. For example, multi-language support is implemented by defining different <a data-link-type="dfn" href="#mix-presentation" id="ref-for-mix-presentation⑤">Mix Presentation</a>s, where the first mix describes the use of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①③">Audio Element</a> with English dialogue, and the second mix describes the use of the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①④">Audio Element</a> with French dialogue.</p>
      </ul>
    </ul>
    <h5 class="heading settled" data-level="2.3.2.2" id="iadata"><span class="secno">2.3.2.2. </span><span class="content">IA Data</span><a class="self-link" href="#iadata"></a></h5>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-data">IA Data</dfn> contains the time-varying data that is required in the generation of the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑥">Immersive Audio</a> output.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="ia-data">IA Data</dfn> contains the time-varying data that is required in the generation of the final <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑦">Immersive Audio</a> output.</p>
    <ul>
     <li data-md>
      <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio-frame-obu">Audio Frame OBU</dfn> provides the coded audio frame for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑤">Audio Substream</a>. Each frame has an implied start timestamp and an explicitly defined duration. A coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream①⑥">Audio Substream</a> is represented as a sequence of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu">Audio Frame OBU</a>s with the same identifier, in time order.</p>
@@ -2645,14 +2637,14 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
    <p><dfn class="css" data-dfn-for="audio_element_obu" data-dfn-type="value" data-noexport id="valdef-audio_element_obu-codec_config_id">codec_config_id<a class="self-link" href="#valdef-audio_element_obu-codec_config_id"></a></dfn> indicates the identifier for the codec configuration which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③①">Audio Element</a> refers to. Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu②">Audio Element OBU</a>s with a <a data-link-type="dfn" href="#codec_config_id" id="ref-for-codec_config_id①">codec_config_id</a> identifying an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id⑤">codec_id</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_substreams">num_substreams</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④④">Audio Substream</a>s that are used to reconstruct this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③②">Audio Element</a>. It SHALL NOT be set to 0.</p>
    <p><dfn class="css" data-dfn-for="audio_element_obu" data-dfn-type="value" data-noexport id="valdef-audio_element_obu-audio_substream_id">audio_substream_id<a class="self-link" href="#valdef-audio_element_obu-audio_substream_id"></a></dfn> indicates the identifier for an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑤">Audio Substream</a> which this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③③">Audio Element</a> refers to.</p>
-   <p>Let a particular <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①①">ChannelGroup</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑥">Audio Substream</a>s be indexed as [<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="c">c</dfn>, <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="n_c">n_c</dfn>], where a <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①②">ChannelGroup</a> generation rule is described in <a href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule">§ 10.2.5 Annex B-5: ChannelGroup Generation Rule</a> and</p>
+   <p>Let a particular <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①②">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑥">Audio Substream</a>s be indexed as [<dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="c">c</dfn>, <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="n_c">n_c</dfn>], where a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①③">Channel Group</a> generation rule is described in <a href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule">§ 10.2.5 Annex B-5: Channel Group Generation Rule</a> and</p>
    <ul>
     <li data-md>
-     <p><a data-link-type="dfn" href="#c" id="ref-for-c">c</a> = [1, ..., C] is the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①③">ChannelGroup</a> index and C is the number of <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①④">ChannelGroup</a>s.</p>
+     <p><a data-link-type="dfn" href="#c" id="ref-for-c">c</a> = [1, ..., C] is the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①④">Channel Group</a> index and C is the number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑤">Channel Group</a>s.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#n_c" id="ref-for-n_c">n_c</a> = [1, ..., N_c] is the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑦">Audio Substream</a> index in the c-th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⑤">ChannelGroup</a> and N_c is the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑧">Audio Substream</a>s in the c-th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⑥">ChannelGroup</a>.</p>
+     <p><a data-link-type="dfn" href="#n_c" id="ref-for-n_c">n_c</a> = [1, ..., N_c] is the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑦">Audio Substream</a> index in the c-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑥">Channel Group</a> and N_c is the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑧">Audio Substream</a>s in the c-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑦">Channel Group</a>.</p>
    </ul>
-   <p>Then, the i-th <a data-link-type="dfn" href="#audio_substream_id" id="ref-for-audio_substream_id③">audio_substream_id</a> maps to a <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⑦">ChannelGroup</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑨">Audio Substream</a>s as follows, where i is the index of the array:</p>
+   <p>Then, the i-th <a data-link-type="dfn" href="#audio_substream_id" id="ref-for-audio_substream_id③">audio_substream_id</a> maps to a <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑧">Channel Group</a>'s <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⑨">Audio Substream</a>s as follows, where i is the index of the array:</p>
 <pre>[
   [1, 1], [1, 2], ..., [1, N_1],
   [2, 1], [2, 2], ..., [2, N_2], 
@@ -2660,7 +2652,7 @@ <h3 class="heading settled" data-level="3.6" id="obu-audioelement"><span class="
   [C, 1], [C, 2], ..., [C, N_c]
 ]
 </pre>
-   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⓪">Audio Substream</a>s in each <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⑧">ChannelGroup</a> (i.e., the semantics of n_c) is specified in <a href="#syntax-scalable-channel-layout-config">§ 3.6.2 Scalable Channel Layout Config Syntax and Semantics</a>.</p>
+   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⓪">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group①⑨">Channel Group</a> (i.e., the semantics of n_c) is specified in <a href="#syntax-scalable-channel-layout-config">§ 3.6.2 Scalable Channel Layout Config Syntax and Semantics</a>.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_parameters">num_parameters</dfn> specifies the number of <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream①⑨">Parameter Substream</a>s that are used by the algorithms specified in this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element③④">Audio Element</a>.</p>
    <ul>
     <li data-md>
@@ -2842,12 +2834,12 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
   }
 }
 </pre>
-   <p>When an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⓪">Audio Element</a> is composed of G(r) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤③">Audio Substream</a>s, its scalable channel audio representation is layered into <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers④">num_layers</a> = r number of <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup①⑨">ChannelGroup</a>s.</p>
+   <p>When an <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④⓪">Audio Element</a> is composed of G(r) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤③">Audio Substream</a>s, its scalable channel audio representation is layered into <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers④">num_layers</a> = r number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⓪">Channel Group</a>s.</p>
    <ul>
     <li data-md>
-     <p>The order of the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⓪">ChannelGroup</a>s in each <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②">Temporal Unit</a> SHALL be same as the order of channel_audio_layer_config()s in scalable_channel_layout_config().</p>
+     <p>The order of the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②①">Channel Group</a>s in each <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit②">Temporal Unit</a> SHALL be same as the order of channel_audio_layer_config()s in scalable_channel_layout_config().</p>
     <li data-md>
-     <p>The q-th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②①">ChannelGroup</a> consists of G(q) - G(q-1) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤④">Audio Substream</a>s, where q = 1, 2, ..., r and G(0) = 0.</p>
+     <p>The q-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②②">Channel Group</a> consists of G(q) - G(q-1) number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤④">Audio Substream</a>s, where q = 1, 2, ..., r and G(0) = 0.</p>
     <li data-md>
      <p>Let the term "Audio Frames" mean the set of all <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②②">Audio Frame OBU</a>s (for this <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④①">Audio Element</a>) that have the same start timestamp. All Audio Frames in an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⑦">IA Sequence</a> SHALL have the same number of <a data-link-type="dfn" href="#audio-frame-obu" id="ref-for-audio-frame-obu②③">Audio Frame OBU</a>s.</p>
     <li data-md>
@@ -2857,7 +2849,7 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
    <center>
     <figcaption>Immersive Audio Sequence with scalable channel audio (before OBU packing). See <a href="#standalone">§ 5 Standalone IAMF Representation</a> for related details on OBU ordering within an IA Sequence.</figcaption>
    </center>
-   <p>Each <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②②">ChannelGroup</a> (or scalable audio channel layer) is associated with a different <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout③">loudspeaker_layout</a>. The IA decoder SHALL select one of the layers according to the following rules, in order:</p>
+   <p>Each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②③">Channel Group</a> (or scalable audio channel layer) is associated with a different <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout③">loudspeaker_layout</a>. The IA decoder SHALL select one of the layers according to the following rules, in order:</p>
    <ul>
     <li data-md>
      <p>The IA decoder SHOULD first attempt to select the layer with a <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout④">loudspeaker_layout</a> that matches the physical playback layout.</p>
@@ -2865,13 +2857,13 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
      <p>If there is no match, the IA decoder SHOULD select the layer with the closest <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑤">loudspeaker_layout</a> to the physical layout and then apply up- or down-mixing appropriately, after decoding and reconstruction of the channel audio. Sections <a href="#iamfgeneration-scalablechannelaudio-downmixmechanism">§ 10.2.2 Annex B-2: Down-mix Mechanism</a> and <a href="#processing-downmixmatrix">§ 7.6 Down-mix Matrix</a> provide examples of dynamic and static down-mixing matrices for some common layouts that MAY be used.</p>
    </ul>
    <p><b>Semantics</b></p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_layers">num_layers</dfn> indicates the number of <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②③">ChannelGroup</a>s for scalable channel audio. It SHALL NOT be set to zero and its maximum value SHALL be 6.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_layers">num_layers</dfn> indicates the number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②④">Channel Group</a>s for scalable channel audio. It SHALL NOT be set to zero and its maximum value SHALL be 6.</p>
    <ul>
     <li data-md>
      <p>If <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑥">loudspeaker_layout</a> is set to Binaural, this field SHALL be set to 1.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_audio_layer_config">channel_audio_layer_config()</dfn> provides the i-th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②④">ChannelGroup</a>'s configuration, where i is the layer index provided as input argument to this class.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudspeaker_layout">loudspeaker_layout</dfn> indicates the channel layout to be reconstructed from the precedent <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⑤">ChannelGroup</a>s and current <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⑥">ChannelGroup</a>. When a reserved value for <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑦">loudspeaker_layout</a> is used, parsers compliant with this version of the specification SHOULD skip the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config">channel_audio_layer_config()</a> for that layer and all subsequent ones, if any.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_audio_layer_config">channel_audio_layer_config()</dfn> provides the i-th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑤">Channel Group</a>'s configuration, where i is the layer index provided as input argument to this class.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="loudspeaker_layout">loudspeaker_layout</dfn> indicates the channel layout to be reconstructed from the precedent <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑥">Channel Group</a>s and current <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑦">Channel Group</a>. When a reserved value for <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑦">loudspeaker_layout</a> is used, parsers compliant with this version of the specification SHOULD skip the <a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config">channel_audio_layer_config()</a> for that layer and all subsequent ones, if any.</p>
    <p>In this version of the specification, <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout⑧">loudspeaker_layout</a> indicates one of the 10 channel layouts listed below, where</p>
    <ul>
     <li data-md>
@@ -2918,30 +2910,30 @@ <h4 class="heading settled" data-level="3.6.2" id="syntax-scalable-channel-layou
      <p>Examples for NOT RECOMMENDED list of channel layouts: 2ch/3.1.2ch/5.1.2ch, 2ch/3.1.2ch/5.1.2ch/7.1.4ch, 2ch/5.1.2ch/7.1.4ch, 2ch/7.1.4ch, etc.</p>
    </ul>
    <p class="note" role="note"><span class="marker">NOTE:</span> This specification allows down-mixing mechanisms (e.g., as specified in <a href="#iamfgeneration-scalablechannelaudio-downmixmechanism">§ 10.2.2 Annex B-2: Down-mix Mechanism</a>) to drop the height channel if the output layout has no height channels. An example is down-mixing from 7.1.4ch to Mono, Stereo, 5.1ch or 7.1ch. Therefore, given an input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⓪">3D audio signal</a> with height channels, an encoder may generate a set of scalable audio channel groups with layouts that do not have height channels.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_gain_is_present_flag">output_gain_is_present_flag</dfn> indicates if the output_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⑦">ChannelGroup</a> are present.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="output_gain_is_present_flag">output_gain_is_present_flag</dfn> indicates if the output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑧">Channel Group</a> are present.</p>
    <ul>
     <li data-md>
-     <p>0: No output_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⑧">ChannelGroup</a> are present.</p>
+     <p>0: No output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group②⑨">Channel Group</a> are present.</p>
     <li data-md>
-     <p>1: output_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup②⑨">ChannelGroup</a> are present. In this case, <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags">output_gain_flags</a> and <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain">output_gain</a> fields are present.</p>
+     <p>1: output_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⓪">Channel Group</a> are present. In this case, <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags">output_gain_flags</a> and <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain">output_gain</a> fields are present.</p>
    </ul>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_is_present_flag">recon_gain_is_present_flag</dfn> indicates if the recon_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⓪">ChannelGroup</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data①">recon_gain_info_parameter_data()</a>.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="recon_gain_is_present_flag">recon_gain_is_present_flag</dfn> indicates if the recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③①">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data①">recon_gain_info_parameter_data()</a>.</p>
    <ul>
     <li data-md>
-     <p>0: No recon_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③①">ChannelGroup</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data②">recon_gain_info_parameter_data()</a>.</p>
+     <p>0: No recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③②">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data②">recon_gain_info_parameter_data()</a>.</p>
     <li data-md>
-     <p>1: recon_gain information fields for the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③②">ChannelGroup</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data③">recon_gain_info_parameter_data()</a>. In this case, the <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags">recon_gain_flags</a> and <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain">recon_gain</a> fields are present.</p>
+     <p>1: recon_gain information fields for the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③③">Channel Group</a> are present in <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data③">recon_gain_info_parameter_data()</a>. In this case, the <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags">recon_gain_flags</a> and <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain">recon_gain</a> fields are present.</p>
    </ul>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="substream_count">substream_count</dfn> specifies the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑤">Audio Substream</a>s. The sum of all <a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count">substream_count</a>s in this OBU SHALL be the same as <a data-link-type="dfn" href="#num_substreams" id="ref-for-num_substreams">num_substreams</a> in this OBU. It SHALL NOT be set to 0.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="coupled_substream_count">coupled_substream_count</dfn> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑥">Audio Substream</a>s, each of which is coded as coupled stereo channels.</p>
-   <p>Each pair of coupled stereo channels in the same <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③③">ChannelGroup</a> SHALL be coded in stereo mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑦">Audio Substream</a> and each of the non-coupled channels in the same <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③④">ChannelGroup</a> SHALL be coded in mono mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑧">Audio Substream</a>.</p>
+   <p>Each pair of coupled stereo channels in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③④">Channel Group</a> SHALL be coded in stereo mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑦">Audio Substream</a> and each of the non-coupled channels in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑤">Channel Group</a> SHALL be coded in mono mode to generate one single coded <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑧">Audio Substream</a>.</p>
    <ul>
     <li data-md>
      <p><dfn data-dfn-type="dfn" data-noexport id="coupled-stereo-channels">Coupled stereo channels<a class="self-link" href="#coupled-stereo-channels"></a></dfn>: L/R, Ls/Rs, Lss/Rss, Lrs/Rrs, Ltf/Rtf, Ltb/Rtb</p>
     <li data-md>
      <dnf>Non-coupled channels: C, LFE, L </dnf>
    </ul>
-   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑨">Audio Substream</a>s in each <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⑤">ChannelGroup</a> SHALL be as follows:</p>
+   <p>The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑤⑨">Audio Substream</a>s in each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑥">Channel Group</a> SHALL be as follows:</p>
    <ul>
     <li data-md>
      <p>Coupled substreams come first and are followed by non-coupled substreams.</p>
@@ -3011,7 +3003,7 @@ <h4 class="heading settled" data-level="3.6.3" id="syntax-ambisonics-config"><sp
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="channel_mapping">channel_mapping</dfn> complies with the "Channel Mapping" field for <a data-link-type="dfn" href="https://opus-codec.org/docs/opus_in_isobmff.html#" id="ref-for-something②⓪">ChannelMappingFamily</a> = 2 in <a data-link-type="biblio" href="#biblio-rfc8486" title="Ambisonics in an Ogg Opus Container">[RFC8486]</a>.</p>
    <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count">coupled_substream_count</a> specifies the number of referenced <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥④">Audio Substream</a>s that are coded as coupled stereo channels, where M &lt;= N.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="demixing_matrix">demixing_matrix</dfn> complies with the "Demixing Matrix" field for <a data-link-type="dfn" href="https://opus-codec.org/docs/opus_in_isobmff.html#" id="ref-for-something②①">ChannelMappingFamily</a> = 3 in <a data-link-type="biblio" href="#biblio-rfc8486" title="Ambisonics in an Ogg Opus Container">[RFC8486]</a> except that the byte order of each of the matrix coefficients is converted to big-endian.</p>
-   <p>A scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④③">Audio Element</a> has only one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⑥">ChannelGroup</a>, which includes all <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑤">Audio Substream</a>s that it refers to. The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑥">Audio Substream</a>s in the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⑦">ChannelGroup</a> SHALL conform to <a data-link-type="biblio" href="#biblio-rfc8486" title="Ambisonics in an Ogg Opus Container">[RFC8486]</a>.</p>
+   <p>A scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④③">Audio Element</a> has only one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑦">Channel Group</a>, which includes all <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑤">Audio Substream</a>s that it refers to. The order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑥⑥">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑧">Channel Group</a> SHALL conform to <a data-link-type="biblio" href="#biblio-rfc8486" title="Ambisonics in an Ogg Opus Container">[RFC8486]</a>.</p>
    <h3 class="heading settled" data-level="3.7" id="obu-mixpresentation"><span class="secno">3.7. </span><span class="content">Mix Presentation OBU Syntax and Semantics</span><a class="self-link" href="#obu-mixpresentation"></a></h3>
    <p>This section specifies the OBU payload of OBU_IA_Mix_Presentation.</p>
    <p>The metadata in <code>mix_presentation_obu</code> specifies how to render, process and mix one or more <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element④④">Audio Element</a>s, with details provided in <a href="#processing-mixpresentation">§ 7.3 Mix Presentation</a>.</p>
@@ -3892,7 +3884,7 @@ <h4 class="heading settled" data-level="6.4.2" id="isobmff-decapsulation-singlet
      <p>The IAMF-ISOBMFF player plays back the trimmed audio samples through the loudspeakers starting at PTS2.</p>
    </ul>
    <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7. </span><span class="content">IAMF Processing</span><a class="self-link" href="#processing"></a></h2>
-   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑨">IA Sequence</a> SHALL be decoded and processed to output an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑦">Immersive Audio</a> according to a given playback layout. It SHALL include the following steps but an IA decoder MAY process the steps in a different order to produce the same result:</p>
+   <p>An <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑥⑨">IA Sequence</a> SHALL be decoded and processed to output an <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑧">Immersive Audio</a> according to a given playback layout. It SHALL include the following steps but an IA decoder MAY process the steps in a different order to produce the same result:</p>
    <ol>
     <li data-md>
      <p>Parsing OBUs to obtain the <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors②⑧">Descriptors</a> and <a data-link-type="dfn" href="#ia-data" id="ref-for-ia-data⑤">IA Data</a>.</p>
@@ -3955,7 +3947,7 @@ <h2 class="heading settled" data-level="7" id="processing"><span class="secno">7
     <li data-md>
      <p>The Audio Element Renderer reconstructs the <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①②">3D audio signal</a> from decoded channels of Codec Decoders according to <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑤">Audio Element</a> type (specified <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑧">Audio Element OBU</a>), and renders the audio channels to the playback layout.</p>
     <li data-md>
-     <p>The Post-Processor outputs the <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑧">Immersive Audio</a> for playback after processing and mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑥">Audio Elements</a>, and then post-processing to perform loudness normalization and peak-limiting.</p>
+     <p>The Post-Processor outputs the <a data-link-type="dfn" href="#immersive-audio" id="ref-for-immersive-audio⑨">Immersive Audio</a> for playback after processing and mixing the <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element⑧⑥">Audio Elements</a>, and then post-processing to perform loudness normalization and peak-limiting.</p>
    </ul>
    <h3 class="heading settled" data-level="7.1" id="processing-ambisonics"><span class="secno">7.1. </span><span class="content">Ambisonics Decoding and Reconstruction</span><a class="self-link" href="#processing-ambisonics"></a></h3>
    <p>The reconstruction of an Ambisonics signal SHALL conform to <a data-link-type="biblio" href="#biblio-rfc8486" title="Ambisonics in an Ogg Opus Container">[RFC8486]</a>, except that a codec other than Opus MAY be used.</p>
@@ -3993,7 +3985,7 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
    <p>For a given loudspeaker layout (i.e., CL #i) among the list of <a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout①④">loudspeaker_layout</a> in <a data-link-type="dfn" href="#scalable_channel_layout_config" id="ref-for-scalable_channel_layout_config②">scalable_channel_layout_config()</a>,</p>
    <ul>
     <li data-md>
-     <p>The OBU Parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧②">Audio Substream</a>s for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⑧">ChannelGroup</a> #1 to <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup③⑨">ChannelGroup</a> #i and pass them to the Codec Decoder, along with <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①②">decoder_config()</a>.</p>
+     <p>The OBU Parser SHALL output the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧②">Audio Substream</a>s for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group③⑨">Channel Group</a> #1 to <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⓪">Channel Group</a> #i and pass them to the Codec Decoder, along with <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config①②">decoder_config()</a>.</p>
     <li data-md>
      <p>The Codec Decoder SHALL output the decoded PCM channels.</p>
      <ul>
@@ -4006,7 +3998,7 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
      <p>For scalable audio (i.e., i > 1), the decoded PCM channels are further processed as:</p>
      <ul>
       <li data-md>
-       <p>When <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag">output_gain_is_present_flag</a>(j) for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⓪">ChannelGroup</a> #j (j = 1, 2, …, i-1) is set to 1, the Gain module SHALL apply <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain④">output_gain</a>(j) to all audio samples of the mixed channels in <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④①">ChannelGroup</a> #j indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags②">output_gain_flag</a>(j).</p>
+       <p>When <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag">output_gain_is_present_flag</a>(j) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④①">Channel Group</a> #j (j = 1, 2, …, i-1) is set to 1, the Gain module SHALL apply <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain④">output_gain</a>(j) to all audio samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④②">Channel Group</a> #j indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags②">output_gain_flag</a>(j).</p>
       <li data-md>
        <p>The De-Mixer SHALL output de-mixed PCM channels for CL #i generated through de-mixing of the mixed channels from the Gain module by using non-mixed channels and demixing parameters for each frame.</p>
       <li data-md>
@@ -4017,7 +4009,7 @@ <h3 class="heading settled" data-level="7.2" id="processing-scalablechannelaudio
    </ul>
    <p>The following sections, <a href="#processing-scalablechannelaudio-gain">§ 7.2.1 Gain</a>, <a href="#processing-scalablechannelaudio-demixer">§ 7.2.2 De-mixer</a> and <a href="#processing-scalablechannelaudio-recongain">§ 7.2.3 Recon Gain</a>), are only needed for decoding scalable audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers①⑥">num_layers</a> > 1.</p>
    <h4 class="heading settled" data-level="7.2.1" id="processing-scalablechannelaudio-gain"><span class="secno">7.2.1. </span><span class="content">Gain</span><a class="self-link" href="#processing-scalablechannelaudio-gain"></a></h4>
-   <p>The Gain module is the mirror process of the Attenuation module (described in <a href="#iamfgeneration-scalablechannelaudio">§ 8.2 Scalable Channel Audio Encoding</a>). It recovers the reduced sample values using <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑤">output_gain</a>(i) when its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag①">output_gain_is_present_flag</a>(i) for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④②">ChannelGroup</a> #i is set to 1. When its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag②">output_gain_is_present_flag</a>(i) is set to 0, then this module SHALL be bypassed for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④③">ChannelGroup</a> #i. The value of <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑥">output_gain</a>(i) for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④④">ChannelGroup</a> #i SHALL be applied to all samples of the mixed channels in <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⑤">ChannelGroup</a> #i, where a mixed channel means the channel created by mixing multiple channels of an input channel audio when generating <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio">down-mixed audio</a> from the input channel audio (i.e., the channel audio for CL #n).</p>
+   <p>The Gain module is the mirror process of the Attenuation module (described in <a href="#iamfgeneration-scalablechannelaudio">§ 8.2 Scalable Channel Audio Encoding</a>). It recovers the reduced sample values using <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑤">output_gain</a>(i) when its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag①">output_gain_is_present_flag</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④③">Channel Group</a> #i is set to 1. When its <a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag②">output_gain_is_present_flag</a>(i) is set to 0, then this module SHALL be bypassed for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④④">Channel Group</a> #i. The value of <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑥">output_gain</a>(i) for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑤">Channel Group</a> #i SHALL be applied to all samples of the mixed channels in <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑥">Channel Group</a> #i, where a mixed channel means the channel created by mixing multiple channels of an input channel audio when generating <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio">down-mixed audio</a> from the input channel audio (i.e., the channel audio for CL #n).</p>
    <p>To apply the gain, an implementation SHALL use the following:</p>
 <pre>sample = sample * pow(10, output_gain(i) / (20.0*256))
 </pre>
@@ -4429,12 +4421,12 @@ <h2 class="heading settled" data-level="8" id="iamfgeneration"><span class="secn
    <p>The IA encoder is composed of the Pre-processor, Codec encoder, and OBU packetizer modules.</p>
    <ul>
     <li data-md>
-     <p>Pre-processor outputs one or more <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⑥">ChannelGroup</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a> and optional <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③①">Parameter Substream</a>s based on the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑤">3D audio signal</a> and user inputs.</p>
+     <p>Pre-processor outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑦">Channel Group</a>s, <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⓪">Descriptors</a> and optional <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③①">Parameter Substream</a>s based on the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal①⑤">3D audio signal</a> and user inputs.</p>
      <ul>
       <li data-md>
-       <p>It outputs one single <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⑦">ChannelGroup</a> for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑨">Audio Element</a>.</p>
+       <p>It outputs one single <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑧">Channel Group</a> for a scene-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①⓪⑨">Audio Element</a>.</p>
       <li data-md>
-       <p>It outputs one or more <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⑧">ChannelGroup</a>s for a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⓪">Audio Element</a>.</p>
+       <p>It outputs one or more <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group④⑨">Channel Group</a>s for a channel-based <a data-link-type="dfn" href="#audio-element" id="ref-for-audio-element①①⓪">Audio Element</a>.</p>
       <li data-md>
        <p>It outputs <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③①">Descriptors</a> which are composed of one <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑤">IA Sequence Header OBU</a>, one <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑧">Codec Config OBU</a>, one <a data-link-type="dfn" href="#audio-element-obu" id="ref-for-audio-element-obu①⑨">Audio Element OBU</a>, and one or more <a data-link-type="dfn" href="#mix-presentation-obu" id="ref-for-mix-presentation-obu⑥">Mix Presentation OBU</a>s.</p>
       <li data-md>
@@ -4449,7 +4441,7 @@ <h2 class="heading settled" data-level="8" id="iamfgeneration"><span class="secn
        </ul>
      </ul>
     <li data-md>
-     <p>Codec encoder generates one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧③">Audio Substream</a>s from each <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup④⑨">ChannelGroup</a> based on <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑨">Codec Config OBU</a>.</p>
+     <p>Codec encoder generates one or more <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧③">Audio Substream</a>s from each <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⓪">Channel Group</a> based on <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu⑨">Codec Config OBU</a>.</p>
     <li data-md>
      <p>OBU packetizer packetizes <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③②">Descriptors</a>, <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑥">Parameter Substream</a>s and <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧④">Audio Substream</a>s into OBUs, and outputs an <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑥">IA Sequence</a>.</p>
      <ul>
@@ -4465,7 +4457,7 @@ <h3 class="heading settled" data-level="8.1" id="iamfgeneration-ambisonics"><spa
    <p>For Ambisonics encoding:</p>
    <ul>
     <li data-md>
-     <p>The Pre-Processor outputs one <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⓪">ChannelGroup</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">Descriptors</a>. It is composed of only the Meta Generator.</p>
+     <p>The Pre-Processor outputs one <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤①">Channel Group</a> and one set of <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③③">Descriptors</a>. It is composed of only the Meta Generator.</p>
      <ul>
       <li data-md>
        <p>The Meta Generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③④">Descriptors</a> based on the Ambisonics mode and the number of channels.</p>
@@ -4484,9 +4476,9 @@ <h3 class="heading settled" data-level="8.1" id="iamfgeneration-ambisonics"><spa
           <li data-md>
            <p><a data-link-type="dfn" href="#output_channel_count" id="ref-for-output_channel_count②">output_channel_count</a> is set to the number of Ambisonics channels, e.g., 4, 9, or 16.</p>
           <li data-md>
-           <p><a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping②">channel_mapping</a> for <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode③">ambisonics_mode</a> = 0 is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑤">Audio Substream</a>s in the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤①">ChannelGroup</a>.</p>
+           <p><a data-link-type="dfn" href="#channel_mapping" id="ref-for-channel_mapping②">channel_mapping</a> for <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode③">ambisonics_mode</a> = 0 is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑤">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤②">Channel Group</a>.</p>
           <li data-md>
-           <p><a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix②">demixing_matrix</a> for <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode④">ambisonics_mode</a> = 1 is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑥">Audio Substream</a>s in the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤②">ChannelGroup</a>.</p>
+           <p><a data-link-type="dfn" href="#demixing_matrix" id="ref-for-demixing_matrix②">demixing_matrix</a> for <a data-link-type="dfn" href="#ambisonics_mode" id="ref-for-ambisonics_mode④">ambisonics_mode</a> = 1 is assigned based on the order of the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑥">Audio Substream</a>s in the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤③">Channel Group</a>.</p>
          </ul>
        </ul>
      </ul>
@@ -4503,7 +4495,7 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
    <p>For Scalable Channel Audio encoding:</p>
    <ul>
     <li data-md>
-     <p>The Pre-processor outputs N <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤③">ChannelGroup</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②③">num_layers</a> = N), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑤">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑦">Parameter Substream</a>s. It is composed of a Down-mix parameter generator, Down-mixer, Loudness, ChannelGroup generator, Attenuation, and Meta generator.</p>
+     <p>The Pre-processor outputs N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤④">Channel Group</a>s (<a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②③">num_layers</a> = N), <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑤">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑦">Parameter Substream</a>s. It is composed of a Down-mix parameter generator, Down-mixer, Loudness, Channel Group generator, Attenuation, and Meta generator.</p>
      <ul>
       <li data-md>
        <p>For non-scalable channel audio (i.e., <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②④">num_layers</a> = 1):</p>
@@ -4513,7 +4505,7 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
         <li data-md>
          <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream③⑨">Parameter Substream</a> for demixing info may be generated by implementers who assume it to be recommended for dynamic downmixing on the decoder side.</p>
         <li data-md>
-         <p>Down-mixer, ChannelGroup generator, and Attenuation modules are not needed.</p>
+         <p>Down-mixer, Channel Group generator, and Attenuation modules are not needed.</p>
        </ul>
       <li data-md>
        <p>Down-mix parameter generator generates 5 down-mix parameters (α(k), β(k), γ(k), δ(k) and w(k)) by analyzing the input channel audio.</p>
@@ -4522,9 +4514,9 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
       <li data-md>
        <p>Loudness module outputs the loudness level (<a data-link-type="dfn" href="https://www.itu.int/dms_pubrec/itu-r/rec/bs/R-REC-BS.1770-4-201510-I!!PDF-E.pdf#" id="ref-for-something①①⑨">LKFS</a>) of each <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑥">down-mixed audio</a> based on <a data-link-type="biblio" href="#biblio-itu1770-4" title="Algorithms to measure audio programme loudness and true-peak audio level">[ITU1770-4]</a>.</p>
       <li data-md>
-       <p>ChannelGroup generator transforms the input channel audio to N <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤④">ChannelGroup</a>s for scalable channel audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑤">num_layers</a> = N by using the down-mix parameters and the list of channel layouts.</p>
+       <p>Channel Group generator transforms the input channel audio to N <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑤">Channel Group</a>s for scalable channel audio with <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑤">num_layers</a> = N by using the down-mix parameters and the list of channel layouts.</p>
       <li data-md>
-       <p>The Attenuation module applies a gain to the transformed <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⑤">ChannelGroup</a>s to prevent clipping.</p>
+       <p>The Attenuation module applies a gain to the transformed <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑥">Channel Group</a>s to prevent clipping.</p>
       <li data-md>
        <p>Meta generator generates <a data-link-type="dfn" href="#descriptors" id="ref-for-descriptors③⑥">Descriptors</a> and <a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④⓪">Parameter Substream</a>s.</p>
        <ul>
@@ -4537,34 +4529,34 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
            <p><a data-link-type="dfn" href="#channel_audio_layer_config" id="ref-for-channel_audio_layer_config③">channel_audio_layer_config()</a> is set as follows:</p>
            <ul>
             <li data-md>
-             <p><a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②④">loudspeaker_layout</a> is set to the ith list of channel layouts for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⑥">ChannelGroup</a>.</p>
+             <p><a data-link-type="dfn" href="#loudspeaker_layout" id="ref-for-loudspeaker_layout②④">loudspeaker_layout</a> is set to the ith list of channel layouts for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑦">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag③">output_gain_is_present_flag</a> is set to 1 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⑦">ChannelGroup</a> if attenuation is applied to the mixed channels of the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⑧">ChannelGroup</a>. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑤⑨">ChannelGroup</a>.</p>
+             <p><a data-link-type="dfn" href="#output_gain_is_present_flag" id="ref-for-output_gain_is_present_flag③">output_gain_is_present_flag</a> is set to 1 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑧">Channel Group</a> if attenuation is applied to the mixed channels of the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑤⑨">Channel Group</a>. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⓪">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag">recon_gain_is_present_flag</a> is set to 1 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⓪">ChannelGroup</a> if the preceding <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥①">ChannelGroup</a>s has one or more mixed channels from the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑦">down-mixed audio</a> for the ith channel layout. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥②">ChannelGroup</a>. Especially, when <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑦">num_layers</a> = 1, this flag is set to 0.</p>
+             <p><a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag">recon_gain_is_present_flag</a> is set to 1 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥①">Channel Group</a> if the preceding <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥②">Channel Group</a>s has one or more mixed channels from the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio⑦">down-mixed audio</a> for the ith channel layout. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥③">Channel Group</a>. Especially, when <a data-link-type="dfn" href="#num_layers" id="ref-for-num_layers②⑦">num_layers</a> = 1, this flag is set to 0.</p>
              <ul>
               <li data-md>
                <p>This flag is set to 0 for lossless codecs including LPCM.</p>
              </ul>
             <li data-md>
-             <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count③">substream_count</a> is set to the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑧">Audio Substream</a>s in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥③">ChannelGroup</a>.</p>
+             <p><a data-link-type="dfn" href="#substream_count" id="ref-for-substream_count③">substream_count</a> is set to the number of <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑧">Audio Substream</a>s in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥④">Channel Group</a>.</p>
             <li data-md>
-             <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count①">coupled_substream_count</a> is set to the number of coupled substreams among the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑨">Audio Substream</a>s that make up the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥④">ChannelGroup</a>.</p>
+             <p><a data-link-type="dfn" href="#coupled_substream_count" id="ref-for-coupled_substream_count①">coupled_substream_count</a> is set to the number of coupled substreams among the <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream⑧⑨">Audio Substream</a>s that make up the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑤">Channel Group</a>.</p>
             <li data-md>
-             <p>Each bit of <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags③">output_gain_flags</a> is set to 1 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⑤">ChannelGroup</a> if attenuation is applied to the relevant channel of the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⑥">ChannelGroup</a>. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⑦">ChannelGroup</a>.</p>
+             <p>Each bit of <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags③">output_gain_flags</a> is set to 1 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑥">Channel Group</a> if attenuation is applied to the relevant channel of the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑦">Channel Group</a>. Otherwise, it is set to 0 for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑧">Channel Group</a>.</p>
             <li data-md>
              <p><a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑧">output_gain</a> is set to the gain (i.e., the inverse of attenuation gain) which is applied to the channels which are indicated by <a data-link-type="dfn" href="#output_gain_flags" id="ref-for-output_gain_flags④">output_gain_flags</a>.</p>
            </ul>
          </ul>
         <li data-md>
-         <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④①">Parameter Substream</a>s can be composed of one for demixing info and the other for recon gain. When <a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag①">recon_gain_is_present_flag</a> = 0 for all <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⑧">ChannelGroup</a>s, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑨">Parameter Block OBU</a>s for recon gain info are present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑦">IA Sequence</a>.</p>
+         <p><a data-link-type="dfn" href="#parameter-substream" id="ref-for-parameter-substream④①">Parameter Substream</a>s can be composed of one for demixing info and the other for recon gain. When <a data-link-type="dfn" href="#recon_gain_is_present_flag" id="ref-for-recon_gain_is_present_flag①">recon_gain_is_present_flag</a> = 0 for all <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑥⑨">Channel Group</a>s, no <a data-link-type="dfn" href="#parameter-block-obu" id="ref-for-parameter-block-obu②⑨">Parameter Block OBU</a>s for recon gain info are present in <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence⑦⑦">IA Sequence</a>.</p>
          <ul>
           <li data-md>
            <p><a data-link-type="dfn" href="#dmixp_mode" id="ref-for-dmixp_mode">dmixp_mode</a> of <a data-link-type="dfn" href="#demixing_info_parameter_data" id="ref-for-demixing_info_parameter_data④">demixing_info_parameter_data()</a> for the kth frame is set to indicate (α(k), β(k), γ(k), δ(k)) and w_idx_offset(k), where w_idx_offset(k) = 1 or -1.</p>
           <li data-md>
            <p><a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags③">recon_gain_flags</a> of <a data-link-type="dfn" href="#recon_gain_info_parameter_data" id="ref-for-recon_gain_info_parameter_data⑥">recon_gain_info_parameter_data()</a> is set to indicate the de-mixed channels which need to apply <a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain①⓪">recon_gain</a> among the output channels after demixing for the ith channel layout.</p>
           <li data-md>
-           <p><a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain①①">recon_gain</a> is set to the gain value to be applied to the channel which is indicated by <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags④">recon_gain_flags</a> for the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑥⑨">ChannelGroup</a>.</p>
+           <p><a data-link-type="dfn" href="#recon_gain" id="ref-for-recon_gain①①">recon_gain</a> is set to the gain value to be applied to the channel which is indicated by <a data-link-type="dfn" href="#recon_gain_flags" id="ref-for-recon_gain_flags④">recon_gain_flags</a> for the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⓪">Channel Group</a>.</p>
          </ul>
        </ul>
      </ul>
@@ -4574,7 +4566,7 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
       <li data-md>
        <p>It may have the immediately preceding <a data-link-type="dfn" href="#temporal-delimiter-obu" id="ref-for-temporal-delimiter-obu①③">Temporal Delimiter OBU</a>.</p>
       <li data-md>
-       <p><a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⓪">ChannelGroup</a>s in a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑨">Temporal Unit</a> are placed in order. In other words, the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦①">ChannelGroup</a> for the first channel layout comes first, followed by the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦②">ChannelGroup</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦③">ChannelGroup</a> for the third channel layout, and so on.</p>
+       <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦①">Channel Group</a>s in a <a data-link-type="dfn" href="#temporal-unit" id="ref-for-temporal-unit①⑨">Temporal Unit</a> are placed in order. In other words, the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦②">Channel Group</a> for the first channel layout comes first, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦③">Channel Group</a> for the second channel layout, followed by the <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦④">Channel Group</a> for the third channel layout, and so on.</p>
      </ul>
    </ul>
    <p>The figure below shows the IA encoding flowchart for Scalable Channel Audio.</p>
@@ -4585,12 +4577,12 @@ <h3 class="heading settled" data-level="8.2" id="iamfgeneration-scalablechannela
      <p>CG Generation module generates the transformed audio according to the CG generation rule based on the list of CLs and the down-mix parameters.</p>
      <ul>
       <li data-md>
-       <p>The transformed audio is structured as <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦④">ChannelGroup</a>s.</p>
+       <p>The transformed audio is structured as <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑤">Channel Group</a>s.</p>
      </ul>
     <li data-md>
      <p>Non-mixed channels of the transformed audio (i.e., the original channels of the input channel audio) are directly input to the Codec encoder, but the mixed channels may be input first to the Attenuation module and then to the Codec encoder.</p>
     <li data-md>
-     <p>The Attenuation module reduces all sample values of the mixed channels in the same <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⑤">ChannelGroup</a> at a uniform rate (<a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑨">output_gain</a>).</p>
+     <p>The Attenuation module reduces all sample values of the mixed channels in the same <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑥">Channel Group</a> at a uniform rate (<a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain⑨">output_gain</a>).</p>
      <ul>
       <li data-md>
        <p>A range of 0 dB to -6 dB is recommended for attenuation. (i.e., a range of 0 dB to 6 dB for <a data-link-type="dfn" href="#output_gain" id="ref-for-output_gain①⓪">output_gain</a>)</p>
@@ -4984,56 +4976,56 @@ <h4 class="heading settled" data-level="10.2.4" id="iamfgeneration-scalablechann
    <p>For example, if we assume CL #i = 7.1.4ch and CL #i-1 = 5.1.2ch, then de-mixed channels are D_Lrs7, D_Rrs7, D_Ltb4 and D_Rtb4.</p>
    <ul>
     <li data-md>
-     <p>D_Lrs7 and D_Rrs7 are de-mixed from Ls5 and Rs5 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⑥">ChannelGroup</a> by using Lss7 and Rss7 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⑦">ChannelGroup</a> and its relevant demixing parameters (i.e., α(k) and β(k)) , respectively.</p>
+     <p>D_Lrs7 and D_Rrs7 are de-mixed from Ls5 and Rs5 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑦">Channel Group</a> by using Lss7 and Rss7 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑧">Channel Group</a> and its relevant demixing parameters (i.e., α(k) and β(k)) , respectively.</p>
     <li data-md>
-     <p>D_Ltb4 and D_Rtb4 are de-mixed from Ltf2 and Rtf2 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⑧">ChannelGroup</a> by using Ltf4 and Rtf4 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑦⑨">ChannelGroup</a> and its relevant demixing parameter (i.e., γ(k)), respectively.</p>
+     <p>D_Ltb4 and D_Rtb4 are de-mixed from Ltf2 and Rtf2 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑦⑨">Channel Group</a> by using Ltf4 and Rtf4 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⓪">Channel Group</a> and its relevant demixing parameter (i.e., γ(k)), respectively.</p>
    </ul>
    <p>Recon_Gain for D_Lrs7:</p>
    <ul>
     <li data-md>
-     <p>Level Ok is the signal power for the frame #k of Lrs7 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⓪">ChannelGroup</a>.</p>
+     <p>Level Ok is the signal power for the frame #k of Lrs7 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧①">Channel Group</a>.</p>
     <li data-md>
-     <p>Level Mk is the signal power for the frame #k of Ls5 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧①">ChannelGroup</a>.</p>
+     <p>Level Mk is the signal power for the frame #k of Ls5 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧②">Channel Group</a>.</p>
     <li data-md>
      <p>Level Dk is the signal power for the frame #k of D_Lrs7.</p>
    </ul>
    <p>Recon_Gain for D_Rrs7:</p>
    <ul>
     <li data-md>
-     <p>Level Ok is the signal power for the frame #k of Rrs7 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧②">ChannelGroup</a>.</p>
+     <p>Level Ok is the signal power for the frame #k of Rrs7 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧③">Channel Group</a>.</p>
     <li data-md>
-     <p>Level Mk is the signal power for the frame #k of Rs5 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧③">ChannelGroup</a>.</p>
+     <p>Level Mk is the signal power for the frame #k of Rs5 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧④">Channel Group</a>.</p>
     <li data-md>
      <p>Level Dk is the signal power for the frame #k of D_Rrs7.</p>
    </ul>
    <p>Recon_Gain for D_Ltb4:</p>
    <ul>
     <li data-md>
-     <p>Level Ok is the signal power for the frame #k of Ltf4 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧④">ChannelGroup</a>.</p>
+     <p>Level Ok is the signal power for the frame #k of Ltf4 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑤">Channel Group</a>.</p>
     <li data-md>
-     <p>Level Mk is the signal power for the frame #k of Ltf2 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⑤">ChannelGroup</a>.</p>
+     <p>Level Mk is the signal power for the frame #k of Ltf2 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑥">Channel Group</a>.</p>
     <li data-md>
      <p>Level Dk is the signal power for the frame #k of D_Ltb4.</p>
    </ul>
    <p>Recon_Gain for D_Rtb4:</p>
    <ul>
     <li data-md>
-     <p>Level Ok is the signal power for the frame #k of Rtf4 in the ith <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⑥">ChannelGroup</a>.</p>
+     <p>Level Ok is the signal power for the frame #k of Rtf4 in the ith <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑦">Channel Group</a>.</p>
     <li data-md>
-     <p>Level Mk is the signal power for the frame #k of Rtf2 in the (i-1)th <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⑦">ChannelGroup</a>.</p>
+     <p>Level Mk is the signal power for the frame #k of Rtf2 in the (i-1)th <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑧">Channel Group</a>.</p>
     <li data-md>
      <p>Level Dk is the signal power for the frame #k of D_Rtb4.</p>
    </ul>
-   <h4 class="heading settled" data-level="10.2.5" id="iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"><span class="secno">10.2.5. </span><span class="content">Annex B-5: ChannelGroup Generation Rule</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"></a></h4>
-   <p>This section describes the generation rule for <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⑧">ChannelGroup</a>.</p>
-   <p>For a given channel-based input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑤">3D audio signal</a> and the list of CLs ({CL #i: i = 1, 2, ..., n}), the CG Generation module outputs the transformed audio (i.e., ChannelGroups) which SHALL conform to the following rules:</p>
+   <h4 class="heading settled" data-level="10.2.5" id="iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"><span class="secno">10.2.5. </span><span class="content">Annex B-5: Channel Group Generation Rule</span><a class="self-link" href="#iamfgeneration-scalablechannelaudio-channelgroupgenerationrule"></a></h4>
+   <p>This section describes the generation rule for <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑧⑨">Channel Group</a>.</p>
+   <p>For a given channel-based input audio and the list of CLs ({CL #i: i = 1, 2, ..., n}), the CG Generation module outputs the transformed audio (i.e., <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⓪">Channel Group</a>s) which SHALL conform to the following rules:</p>
    <ul>
     <li data-md>
-     <p>It consists of C number of channels and is structured to n number of <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑧⑨">ChannelGroup</a>s, where C is the number of channels for the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑥">3D audio signal</a>.</p>
+     <p>It consists of C number of channels and is structured to n number of <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨①">Channel Group</a>s, where C is the number of channels for the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑤">3D audio signal</a>.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨⓪">ChannelGroup</a> #1 (as called BCG): This <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨①">ChannelGroup</a> is the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑥">down-mixed audio</a> itself for CL #1 generated from the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑦">3D audio signal</a>. It contains a C1 number of channels.</p>
+     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨②">Channel Group</a> #1 (as called BCG): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨③">Channel Group</a> is the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑥">down-mixed audio</a> itself for CL #1 generated from the input <a data-link-type="dfn" href="#3d-audio-signal" id="ref-for-3d-audio-signal②⑥">3D audio signal</a>. It contains a C1 number of channels.</p>
     <li data-md>
-     <p><a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨②">ChannelGroup</a> #i (as called DCG, i = 2, 3, …, n): This <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨③">ChannelGroup</a> contains (Ci – Ci-1) number of channels. (Ci – Ci-1) channel(s) consists of as follows:</p>
+     <p><a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨④">Channel Group</a> #i (as called DCG, i = 2, 3, …, n): This <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑤">Channel Group</a> contains (Ci – Ci-1) number of channels. (Ci – Ci-1) channel(s) consists of as follows:</p>
      <ul>
       <li data-md>
        <p>(Si – Si-1) surround channel(s) if Si > Si-1 . When S_set = { x | Si-1 &lt; x ≤ Si and x is an integer},</p>
@@ -5053,9 +5045,9 @@ <h4 class="heading settled" data-level="10.2.5" id="iamfgeneration-scalablechann
        <p>(Ti – Ti-1) top channels if Ti > Ti-1 .</p>
        <ul>
         <li data-md>
-         <p>If Ti-1 = 0, the top channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑦">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨④">ChannelGroup</a> #i.</p>
+         <p>If Ti-1 = 0, the top channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑦">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑥">Channel Group</a> #i.</p>
         <li data-md>
-         <p>If Ti-1 = 2, the Ltf and Rtf channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑧">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channelgroup" id="ref-for-channelgroup⑨⑤">ChannelGroup</a> #i.</p>
+         <p>If Ti-1 = 2, the Ltf and Rtf channels of the <a data-link-type="dfn" href="#down-mixed-audio" id="ref-for-down-mixed-audio①⑧">down-mixed audio</a> for CL #i are contained in this <a data-link-type="dfn" href="#channel-group" id="ref-for-channel-group⑨⑦">Channel Group</a> #i.</p>
        </ul>
      </ul>
    </ul>
@@ -5214,7 +5206,7 @@ <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index
   <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
   <ul class="index">
    <li><a href="#312ch">3.1.2ch</a><span>, in § 3.6.2</span>
-   <li><a href="#3d-audio-signal">3D audio signal</a><span>, in § 1</span>
+   <li><a href="#3d-audio-signal">3D audio signal</a><span>, in § 2.1</span>
    <li><a href="#512ch">5.1.2ch</a><span>, in § 3.6.2</span>
    <li><a href="#514ch">5.1.4ch</a><span>, in § 3.6.2</span>
    <li><a href="#51ch">5.1ch</a><span>, in § 3.6.2</span>
@@ -5253,7 +5245,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#beta">beta</a><span>, in § 3.8.2</span>
    <li><a href="#c">c</a><span>, in § 3.6</span>
    <li><a href="#channel_audio_layer_config">channel_audio_layer_config()</a><span>, in § 3.6.2</span>
-   <li><a href="#channelgroup">ChannelGroup</a><span>, in § 2.1</span>
+   <li><a href="#channel-group">Channel Group</a><span>, in § 2.1</span>
    <li><a href="#channel_mapping">channel_mapping</a><span>, in § 3.6.3</span>
    <li>
     codec_config_id
@@ -5318,7 +5310,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#ia-sequence">IA Sequence</a><span>, in § 5.1</span>
    <li><a href="#ia-sequence-header-obu">IA Sequence Header OBU</a><span>, in § 2.3.2.1</span>
    <li><a href="#ia-track">IA Track</a><span>, in § 6.2.1</span>
-   <li><a href="#immersive-audio">Immersive Audio</a><span>, in § 1</span>
+   <li><a href="#immersive-audio">Immersive Audio</a><span>, in § 2.1</span>
    <li><a href="#info_type">info_type</a><span>, in § 3.7.7</span>
    <li><a href="#info_type_bytes">info_type_bytes</a><span>, in § 3.7.7</span>
    <li><a href="#info_type_size">info_type_size</a><span>, in § 3.7.7</span>
@@ -5999,13 +5991,13 @@ <h3 class="no-num no-ref heading settled" id="informative"><span class="content"
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