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hpf + bpf

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Felix Roos 2025-06-06 10:12:49 +02:00
parent 794bf86904
commit 6cf0b6f651
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1 changed files with 29 additions and 29 deletions
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58
packages/superdough/dough.mjs
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@ -60,7 +60,7 @@ export class TriOsc {
}
}
export class Lpf {
export class TwoPoleFilter {
s0 = 0;
s1 = 0;
update(s, cutoff, resonance = 0) {
@ -70,15 +70,10 @@ export class Lpf {
var c = Math.pow(0.5, (1 - cutoff) / 0.125);
var r = Math.pow(0.5, (resonance + 0.125) / 0.125);
var mrc = 1 - r * c;
var v0 = this.s0;
var v1 = this.s1;
// Apply the filter to the sample
v0 = mrc * v0 - c * v1 + c * s;
v1 = mrc * v1 + c * v0;
s = v1;
this.s0 = v0;
this.s1 = v1;
return s;
this.s0 = mrc * this.s0 - c * this.s1 + c * s; // bpf
this.s1 = mrc * this.s1 + c * this.s0; // lpf
return this.s1; // return lpf by default
}
}
@ -287,6 +282,7 @@ export class Slew {
}
}
// overdrive style distortion (adapted from noisecraft) currently unused
export function applyDistortion(x, amount) {
amount = Math.min(Math.max(amount, 0), 1);
amount -= 0.01;
@ -332,16 +328,6 @@ 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) {
@ -394,9 +380,12 @@ const defaultDefaultValues = {
density: '.03',
ftype: '12db',
fanchor: 0,
resonance: 1,
hresonance: 1,
bandq: 1,
//resonance: 1, // superdough resonance is scaled differently
resonance: 0,
//hresonance: 1, // superdough resonance is scaled differently
hresonance: 0,
// bandq: 1, // superdough resonance is scaled differently
bandq: 0,
channels: [1, 2],
phaserdepth: 0.75,
shapevol: 1,
@ -470,11 +459,7 @@ export class DoughVoice {
phaserrate,
phasersweep,
phasercenter,
coarse,
crush,
shape,
distort,
pan,
vowel,
room,
roomfade,
@ -520,7 +505,9 @@ export class DoughVoice {
const SourceClass = oscillators[this.s] ?? TriOsc;
this._sound = new SourceClass();
this._lpf = this.cutoff ? new Lpf() : null;
this._lpf = this.cutoff ? new TwoPoleFilter() : null;
this._hpf = this.hcutoff ? new TwoPoleFilter() : null;
this._bpf = this.bandf ? new TwoPoleFilter() : null;
this._adsr = new ADSR();
this._coarse = this.coarse ? new Coarse() : null;
this._crush = this.crush ? new Crush() : null;
@ -548,7 +535,20 @@ export class DoughVoice {
// lpf
if (this._lpf) {
const cutoff = this.freq2cutoff(this.cutoff);
s = this._lpf.update(s, cutoff, this.resonance);
this._lpf.update(s, cutoff, this.resonance);
s = this._lpf.s1;
}
// hpf
if (this._hpf) {
const cutoff = this.freq2cutoff(this.hcutoff);
this._hpf.update(s, cutoff, this.hresonance);
s = s - this._hpf.s1;
}
// bpf
if (this._bpf) {
const cutoff = this.freq2cutoff(this.bandf);
this._bpf.update(s, cutoff, this.bandq);
s = this._bpf.s0;
}
this._coarse && (s = this._coarse.update(s, this.coarse));