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add vowel to .out #201

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merged 2 commits into from
Sep 15, 2022
Merged

add vowel to .out #201

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4406dd8
add vowel
felixroos Sep 15, 2022
149b2ab
make vowel work with node
felixroos Sep 15, 2022
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38 changes: 38 additions & 0 deletions packages/webaudio/vowel.mjs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,38 @@
// credits to webdirt: https://github.com/dktr0/WebDirt/blob/41342e81d6ad694a2310d491fef7b7e8b0929efe/js-src/Graph.js#L597
export var vowelFormant = {
a: { freqs: [660, 1120, 2750, 3000, 3350], gains: [1, 0.5012, 0.0708, 0.0631, 0.0126], qs: [80, 90, 120, 130, 140] },
e: { freqs: [440, 1800, 2700, 3000, 3300], gains: [1, 0.1995, 0.1259, 0.1, 0.1], qs: [70, 80, 100, 120, 120] },
i: { freqs: [270, 1850, 2900, 3350, 3590], gains: [1, 0.0631, 0.0631, 0.0158, 0.0158], qs: [40, 90, 100, 120, 120] },
o: { freqs: [430, 820, 2700, 3000, 3300], gains: [1, 0.3162, 0.0501, 0.0794, 0.01995], qs: [40, 80, 100, 120, 120] },
u: { freqs: [370, 630, 2750, 3000, 3400], gains: [1, 0.1, 0.0708, 0.0316, 0.01995], qs: [40, 60, 100, 120, 120] },
};
if (typeof GainNode !== 'undefined') {
class VowelNode extends GainNode {
constructor(ac, letter) {
super(ac);
if (!vowelFormant[letter]) {
throw new Error('vowel: unknown vowel ' + letter);
}
const { gains, qs, freqs } = vowelFormant[letter];
const makeupGain = ac.createGain();
for (let i = 0; i < 5; i++) {
const gain = ac.createGain();
gain.gain.value = gains[i];
const filter = ac.createBiquadFilter();
filter.type = 'bandpass';
filter.Q.value = qs[i];
filter.frequency.value = freqs[i];
this.connect(filter);
filter.connect(gain);
gain.connect(makeupGain);
}
makeupGain.gain.value = 8; // how much makeup gain to add?
this.connect = (target) => makeupGain.connect(target);
return this;
}
}

AudioContext.prototype.createVowelFilter = function (letter) {
return new VowelNode(this, letter);
};
}
3 changes: 3 additions & 0 deletions packages/webaudio/webaudio.mjs
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Expand Up @@ -9,6 +9,7 @@ import * as strudel from '@strudel.cycles/core';
import { fromMidi, toMidi } from '@strudel.cycles/core';
import { loadBuffer } from './sampler.mjs';
const { Pattern } = strudel;
import './vowel.mjs';

// export const getAudioContext = () => Tone.getContext().rawContext;

Expand Down Expand Up @@ -158,6 +159,7 @@ Pattern.prototype.out = function () {
speed = 1, // sample playback speed
begin = 0,
end = 1,
vowel,
} = hap.value;
const { velocity = 1 } = hap.context;
gain *= velocity; // legacy fix for velocity
Expand Down Expand Up @@ -258,6 +260,7 @@ Pattern.prototype.out = function () {
cutoff !== undefined && chain.push(getFilter('lowpass', cutoff, resonance));
hcutoff !== undefined && chain.push(getFilter('highpass', hcutoff, hresonance));
bandf !== undefined && chain.push(getFilter('bandpass', bandf, bandq));
vowel !== undefined && chain.push(ac.createVowelFilter(vowel));
// TODO vowel
// TODO delay / delaytime / delayfeedback
// panning
Expand Down