v0.6.0 Improved SVF (#29)

CHANGELOG.md

@@ -1,16 +1,37 @@
 # synthlet
 
+## 0.6.0
+
+### Minor Changes
+
+- d9ae8bf: State Variable Filter improvements:
+
+  - It uses a better algorithm (by Andrew Simper and Freq Anton Corvest)
+  - `frequency` is now a a-rate parameter suitable for modulation
+  - Renamed `resonance` to `Q` to match Web Audio API standard
+
+### Patch Changes
+
+- Updated dependencies [d9ae8bf]
+  - @synthlet/state-variable-filter@0.2.0
+
+## 0.5.0
+
+- New chorus @synthlet/chorus
+
+- Updated dependencies
+  - @synthlet/chorus@0.1.0
+  - @synthlet/chorus-t@0.1.1
+
 ## 0.4.0
 
-- New @synthlet/arp package
+- New arpeggiator @synthlet/arp package
 
 ## 0.3.0
 
+- New reverb @synthlet/dattorro-reverb
 - Function `registerSynthlet` renamed to `registerAllWorklets`
 
-- Initial release of:
-  - @synthlet/dattorro-reverb@0.1.0
-
 ## 0.2.0
 
 - Initial release of the following modules:

README.md

@@ -8,8 +8,8 @@ Collection of synth modules implemented as AudioWorklets.
 import {
   registerAllWorklets,
   AdsrAmp,
-  StateVariableFilter,
-  StateVariableFilterType,
+  Svf,
+  SvfType,
   PolyblepOscillator
 } from "synthlet";
 
@@ -18,8 +18,8 @@ await registerAllWorklets(ac);
 
 // Simplest synth: Oscillator -> Filter -> Amplifier
 const osc = PolyblepOscillator(ac, { frequency: 440 });
-const filter = StateVariableFilter(ac, {
-  type: StateVariableFilterType.LowPass
+const filter = Svf(ac, {
+  type: SvfType.LowPass
   frequency: 4000,
 });
 const amp = AdsrAmp(ac, { attack: 0.1, release: 0.5 });
@@ -84,7 +84,6 @@ This library wouldn't be possible with all the people writing books, blog posts
 - https://github.com/BillyDM/awesome-audio-dsp
 - https://paulbatchelor.github.io/sndkit/algos/
 - https://www.musicdsp.org/
-- [Cytomic technical papers](https://cytomic.com/technical-papers/) specially famous for its [State Variable Filters](https://cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf)
 - [Signalsmith Audio blog](https://signalsmith-audio.co.uk/writing/)
 - [Valhalla DSP Blog](https://valhalladsp.com/category/learn/plugin-design-learn/)
 - http://synthworks.eu/ - DIY Synthetizers

package.json

@@ -26,6 +26,7 @@
     "test": "jest --coverage",
     "test:ci": "npm run api && npm run build && npm run test",
     "processors": "find ./packages -name 'processor.ts' -exec wc -m {} +",
+    "bump": "changeset version && npm run publish:prepare",
     "publish:prepare": "cp README.md packages/synthlet && cp packages/synthlet/CHANGELOG.md CHANGELOG.md"
   },
   "packageManager": "npm@7.21.0"

packages/state-variable-filter/CHANGELOG.md

@@ -1,5 +1,13 @@
 # @synthlet/state-variable-filter
 
+## 0.2.0
+
+- State Variable Filter improvements:
+
+- It uses a better algorithm (by Andrew Simper and Freq Anton Corvest)
+- `frequency` is now a a-rate parameter suitable for modulation
+- Renamed `resonance` to `Q` to match Web Audio API standard
+
 ## 0.1.0
 
 - Initial release

packages/state-variable-filter/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@synthlet/state-variable-filter",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "State Variable Filter module for synthlet",
   "keywords": [
     "modular",

packages/state-variable-filter/src/__snapshots__/filter.test.ts.snap

@@ -27,50 +27,50 @@ Float32Array [
 
 exports[`SVFilter filters the signal 2`] = `
 Float32Array [
-  -7.058988571166992,
-  -96.1963882446289,
-  -933.3245239257812,
-  -7950.83740234375,
-  -63193.6796875,
-  -481030.5,
-  -3555095.5,
-  -25716442,
-  -183016032,
-  -1285889280,
-  -8941918208,
-  -61654106112,
-  -422081658880,
-  -2872091344896,
-  -19441708433408,
-  -131008733118464,
-  -879299460595712,
-  -5880895244337152,
-  -39209108632502270,
-  -260680291251650560,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
+  -1,
+  1,
 ]
 `;
 
 exports[`SVFilter filters the signal 3`] = `
 Float32Array [
-  -1728730658831859700,
-  -11437933590730506000,
-  -75519349223376030000,
-  -497665280641740050000,
-  -3.2738075880989456e+21,
-  -2.150135330517005e+22,
-  -1.4100311966854957e+23,
-  -9.233990443912205e+23,
-  -6.03935217634656e+24,
-  -3.9452060773814655e+25,
-  -2.574315262255496e+26,
-  -1.6780219466165328e+27,
-  -1.0927115680685831e+28,
-  -7.109042947525591e+28,
-  -4.621019964675439e+29,
-  -3.001284075478557e+30,
-  -1.9477740115635436e+31,
-  -1.263136567931854e+32,
-  -8.18576013175832e+32,
-  -5.3012721012231e+33,
+  29.75,
+  9.75,
+  3.608224830031759e-15,
+  8.326672684688674e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
+  2.7755575615628914e-17,
 ]
 `;

packages/state-variable-filter/src/__snapshots__/worklet.test.ts.snap

@@ -5,23 +5,23 @@ exports[`ProcessorNode has parameter descriptors 1`] = `
   {
     "automationRate": "k-rate",
     "defaultValue": 1,
-    "maxValue": 3,
+    "maxValue": 10,
     "minValue": 0,
     "name": "type",
   },
   {
-    "automationRate": "k-rate",
+    "automationRate": "a-rate",
     "defaultValue": 1000,
     "maxValue": 20000,
     "minValue": 20,
     "name": "frequency",
   },
   {
     "automationRate": "k-rate",
-    "defaultValue": 1,
+    "defaultValue": 0.5,
     "maxValue": 40,
-    "minValue": 0,
-    "name": "resonance",
+    "minValue": 0.025,
+    "name": "Q",
   },
 ]
 `;