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distort

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This commit is contained in:
Felix Roos 2025-06-06 09:56:41 +02:00
parent 9ed690ce45
commit 794bf86904
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1 changed files with 26 additions and 6 deletions
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32
packages/superdough/dough.mjs
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@ -332,6 +332,26 @@ export class Crush {
}
}
// (unused) overdrive-style distortion (adapted from noisecraft)
export class Overdrive {
update(input, amount = 0, postgain = 1) {
amount = Math.min(Math.max(amount, 0), 1);
amount -= 0.01;
const shape = (2 * amount) / (1 - amount);
return (((1 + shape) * input) / (1 + shape * Math.abs(input))) * postgain;
}
}
// this is the distort from superdough
export class Distort {
update(input, distort = 0, postgain = 1) {
postgain = Math.max(0.001, Math.min(1, postgain));
const shape = Math.expm1(distort);
return (((1 + shape) * input) / (1 + shape * Math.abs(input))) * postgain;
}
}
// distortion could be expressed as a function, because it's stateless
export function _rangex(sig, min, max) {
let logmin = Math.log(min);
let range = Math.log(max) - logmin;
@ -504,6 +524,7 @@ export class DoughVoice {
this._adsr = new ADSR();
this._coarse = this.coarse ? new Coarse() : null;
this._crush = this.crush ? new Crush() : null;
this._distort = this.distort ? new Distort() : null;
this.piOverSr = Math.PI / value.sampleRate;
this.eighthOverLogHalf = 0.125 / Math.log(0.5);
@ -529,12 +550,11 @@ export class DoughVoice {
const cutoff = this.freq2cutoff(this.cutoff);
s = this._lpf.update(s, cutoff, this.resonance);
}
if (this._coarse) {
s = this._coarse.update(s, this.coarse);
}
if (this._crush) {
s = this._crush.update(s, this.crush);
}
this._coarse && (s = this._coarse.update(s, this.coarse));
this._crush && (s = this._crush.update(s, this.crush));
this._distort && (s = this._distort.update(s, this.distort, this.distortvol));
// not sure if gain/velocity is applied here
s = s * this.gain * this.velocity;
// envelope