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fix: additive synthesis

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This commit is contained in:
Felix Roos 2023-10-27 21:55:49 +02:00
parent a57c2b9fe5
commit c085694a8b
1 changed files with 8 additions and 7 deletions
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15
packages/superdough/synth.mjs
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@ -73,13 +73,13 @@ export function waveformN(partials, type) {
const ac = getAudioContext(); const ac = getAudioContext();
const osc = ac.createOscillator(); const osc = ac.createOscillator();
const amplitudes = { const terms = {
sawtooth: (n) => 1 / n, sawtooth: (n) => [0, -1 / n],
square: (n) => (n % 2 === 0 ? 0 : 1 / n), square: (n) => [0, n % 2 === 0 ? 0 : 1 / n],
triangle: (n) => (n % 2 === 0 ? 0 : 1 / (n * n)), triangle: (n) => [n % 2 === 0 ? 0 : 1 / (n * n), 0],
}; };
if (!amplitudes[type]) { if (!terms[type]) {
throw new Error(`unknown wave type ${type}`); throw new Error(`unknown wave type ${type}`);
} }
@ -87,8 +87,9 @@ export function waveformN(partials, type) {
imag[0] = 0; imag[0] = 0;
let n = 1; let n = 1;
while (n <= partials) { while (n <= partials) {
real[n] = amplitudes[type](n); const [r, i] = terms[type](n);
imag[n] = 0; real[n] = r;
imag[n] = i;
n++; n++;
} }