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Merge pull request '[supradough] fix: unstable filter' (#1593) from supradough-filter-fix into main

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Reviewed-on: https://codeberg.org/uzu/strudel/pulls/1593
This commit is contained in:
froos
2025-11-12 21:22:33 +01:00
parent bbb977afcc a0c2edad30
commit 0960741156
1 changed files with 4 additions and 2 deletions
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packages/supradough/dough.mjs
+4 -2
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@@ -1,11 +1,12 @@
// this is dough, the superdough without dependencies
// @ts-check
// @ts-nocheck
// @ts-ignore ignore next line because sampleRate is unknown
const SAMPLE_RATE = typeof sampleRate !== 'undefined' ? sampleRate : 48000;
const PI_DIV_SR = Math.PI / SAMPLE_RATE;
const ISR = 1 / SAMPLE_RATE;
let gainCurveFunc = (val) => Math.pow(val, 2);
const clamp = (num, min, max) => Math.min(Math.max(num, min), max);
function applyGainCurve(val) {
return gainCurveFunc(val);
@@ -151,7 +152,8 @@ export class TwoPoleFilter {
resonance = Math.max(resonance, 0);
cutoff = Math.min(cutoff, 20000);
const c = 2 * Math.sin(cutoff * PI_DIV_SR);
let c = 2 * Math.sin(cutoff * PI_DIV_SR);
c = clamp(c, 0, 1.14); // this line prevents instability TODO: test
const r = Math.pow(0.5, (resonance + 0.125) / 0.125);
const mrc = 1 - r * c;