Tone.js/Tone/instrument/PluckSynth.ts
2019-10-28 17:31:32 -04:00

128 lines
3.1 KiB
TypeScript

import { Frequency, NormalRange, Time } from "../core/type/Units";
import { LowpassCombFilter } from "../component/filter/LowpassCombFilter";
import { deepMerge } from "../core/util/Defaults";
import { optionsFromArguments } from "../core/util/Defaults";
import { RecursivePartial } from "../core/util/Interface";
import { Noise } from "../source/Noise";
import { Instrument, InstrumentOptions } from "./Instrument";
export interface PluckSynthOptions extends InstrumentOptions {
attackNoise: number;
dampening: Frequency;
resonance: NormalRange;
release: Time;
}
/**
* Karplus-String string synthesis.
* @example
* import { PluckSynth } from "tone";
* const plucky = new PluckSynth().toDestination();
* plucky.triggerAttack("C4", "+0.5");
* plucky.triggerAttack("C3", "+1");
* plucky.triggerAttack("C2", "+1.5");
* plucky.triggerAttack("C1", "+2");
* @category Instrument
*/
export class PluckSynth extends Instrument<PluckSynthOptions> {
readonly name = "PluckSynth";
/**
* Noise burst at the beginning
*/
private _noise: Noise;
private _lfcf: LowpassCombFilter;
/**
* The amount of noise at the attack.
* Nominal range of [0.1, 20]
* @min 0.1
* @max 20
*/
attackNoise: number;
/**
* The amount of resonance of the pluck. Also correlates to the sustain duration.
*/
resonance: NormalRange;
/**
* The release time which corresponds to a resonance ramp down to 0
*/
release: Time;
constructor(options?: RecursivePartial<PluckSynthOptions>)
constructor() {
super(optionsFromArguments(PluckSynth.getDefaults(), arguments));
const options = optionsFromArguments(PluckSynth.getDefaults(), arguments);
this._noise = new Noise({
context: this.context,
type: "pink"
});
this.attackNoise = options.attackNoise;
this._lfcf = new LowpassCombFilter({
context: this.context,
dampening: options.dampening,
resonance: options.resonance,
});
this.resonance = options.resonance;
this.release = options.release;
this._noise.connect(this._lfcf);
this._lfcf.connect(this.output);
}
static getDefaults(): PluckSynthOptions {
return deepMerge(Instrument.getDefaults(), {
attackNoise: 1,
dampening: 4000,
resonance: 0.7,
release: 1,
});
}
/**
* The dampening control. i.e. the lowpass filter frequency of the comb filter
* @min 0
* @max 7000
*/
get dampening(): Frequency {
return this._lfcf.dampening;
}
set dampening(fq) {
this._lfcf.dampening = fq;
}
triggerAttack(note: Frequency, time?: Time): this {
const freq = this.toFrequency(note);
time = this.toSeconds(time);
const delayAmount = 1 / freq;
this._lfcf.delayTime.setValueAtTime(delayAmount, time);
this._noise.start(time);
this._noise.stop(time + delayAmount * this.attackNoise);
this._lfcf.resonance.cancelScheduledValues(time);
this._lfcf.resonance.setValueAtTime(this.resonance, time);
return this;
}
/**
* Ramp down the [[resonance]] to 0 over the duration of the release time.
*/
triggerRelease(time?: Time): this{
this._lfcf.resonance.linearRampTo(0, this.release, time);
return this;
}
dispose(): this {
super.dispose();
this._noise.dispose();
this._lfcf.dispose();
return this;
}
}