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builtin sound: frequency distortion #2

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asheplyakov opened this issue Apr 7, 2021 · 1 comment
Open

builtin sound: frequency distortion #2

asheplyakov opened this issue Apr 7, 2021 · 1 comment

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@asheplyakov
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Steps to reproduce:

  1. Connect speakers (or a headset) to the builtin audio output
  2. Play 440 Hz sine wave (for instance from https://www.youtube.com/watch?v=xM6cFKJRl4s)
  3. Record the sound on another computer, measure the frequency with a (software) tuner (such as https://github.com/ibancg/lingot) or oscilloscope
  • Expected result: measured frequency is 440 Hz
  • Actual result: measured frequency is 468 Hz
@ValdikSS
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Hardware issue, likely won't get workaround in software.

asheplyakov added a commit to asheplyakov/linux that referenced this issue Jun 28, 2022
@asheplyakov
(BROKEN) dwc-i2s: support BE-M1000 SoC
7d9254b 
* dw_i2s_probe: request all IRQs specified in device tree
* dw_i2s_startup: set the correct DAI clock frequency

Note that the sound frequency is distorted (i.e. playing 440 Hz
sine wave results in 467 Hz), for more details see

edelweiss-tech/kernel#2
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@ValdikSS @asheplyakov