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fix: unstable filter

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This commit is contained in:
Felix Roos 2025-09-18 10:47:23 +02:00
parent 4cb0488839
commit 82c9047195
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1 changed files with 3 additions and 2 deletions
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5
packages/supradough/dough.mjs
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@ -1,5 +1,5 @@
// 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;
@ -151,7 +151,8 @@ 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;