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Use the per-sample frequency and properly wrap polyBlep

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Aria
2025-08-09 16:25:11 -05:00
parent 2e8a8b50df
commit 218952b8b6
1 changed files with 9 additions and 9 deletions
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packages/superdough/worklets.mjs
+9 -9
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@@ -18,9 +18,10 @@ function wrapPhase(phase, maxPhase = 1) {
return phase;
}
const blockSize = 128;
// Smooth waveshape near discontinuities to remove frequencies above nyquist and prevent aliasing
// Smooth waveshape near discontinuities to remove frequencies above Nyquist and prevent aliasing
// referenced from https://www.kvraudio.com/forum/viewtopic.php?t=375517
function polyBlep(phase, dt) {
dt = Math.min(dt, 1 - dt);
// Start of cycle
if (phase < dt) {
phase /= dt;
@@ -451,7 +452,6 @@ class SuperSawOscillatorProcessor extends AudioWorkletProcessor {
// this.port.postMessage({ type: 'onended' });
return false;
}
const frequency = applySemitoneDetuneToFrequency(params.frequency[0], params.detune[0] / 100);
const output = outputs[0];
const voices = params.voices[0];
@@ -462,9 +462,6 @@ class SuperSawOscillatorProcessor extends AudioWorkletProcessor {
for (let n = 0; n < voices; n++) {
const isOdd = (n & 1) == 1;
//applies unison "spread" detune in semitones
const freq = applySemitoneDetuneToFrequency(frequency, getUnisonDetune(voices, freqspread, n));
let gainL = gain1;
let gainR = gain2;
// invert right and left gain
@@ -472,11 +469,14 @@ class SuperSawOscillatorProcessor extends AudioWorkletProcessor {
gainL = gain2;
gainR = gain1;
}
// We must wrap this here because it is passed into sawblep below which
// has domain [0, 1]
const dt = wrapPhase(freq / sampleRate);
for (let i = 0; i < output[0].length; i++) {
// Main detuning
let freq = applySemitoneDetuneToFrequency(params.frequency[i] ?? params.frequency[0], params.detune[0] / 100);
// Individual voice detuning
freq = applySemitoneDetuneToFrequency(freq, getUnisonDetune(voices, freqspread, n));
// We must wrap this here because it is passed into sawblep below which
// has domain [0, 1]
const dt = _mod(freq / sampleRate, 1);
this.phase[n] = this.phase[n] ?? Math.random();
const v = waveshapes.sawblep(this.phase[n], dt);