mirror of
https://github.com/Tonejs/Tone.js
synced 2024-12-29 04:53:10 +00:00
146 lines
3.7 KiB
JavaScript
146 lines
3.7 KiB
JavaScript
import Tone from "../core/Tone";
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import "../component/FeedbackCombFilter";
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import "../effect/StereoEffect";
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import "../signal/Scale";
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/**
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* an array of the comb filter delay time values
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* @private
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* @static
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* @type {Array}
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*/
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var combFilterDelayTimes = [1687 / 25000, 1601 / 25000, 2053 / 25000, 2251 / 25000];
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/**
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* the resonances of each of the comb filters
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* @private
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* @static
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* @type {Array}
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*/
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var combFilterResonances = [0.773, 0.802, 0.753, 0.733];
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/**
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* the allpass filter frequencies
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* @private
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* @static
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* @type {Array}
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*/
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var allpassFilterFreqs = [347, 113, 37];
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/**
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* @class Tone.JCReverb is a simple [Schroeder Reverberator](https://ccrma.stanford.edu/~jos/pasp/Schroeder_Reverberators.html)
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* tuned by John Chowning in 1970.
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* It is made up of three allpass filters and four Tone.FeedbackCombFilter.
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*
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*
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* @extends {Tone.Effect}
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* @constructor
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* @param {NormalRange|Object} [roomSize] Coorelates to the decay time.
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* @example
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* var reverb = new Tone.JCReverb(0.4).connect(Tone.Master);
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* var delay = new Tone.FeedbackDelay(0.5);
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* //connecting the synth to reverb through delay
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* var synth = new Tone.DuoSynth().chain(delay, reverb);
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* synth.triggerAttackRelease("A4","8n");
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*/
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Tone.JCReverb = function(){
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var options = Tone.defaults(arguments, ["roomSize"], Tone.JCReverb);
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Tone.StereoEffect.call(this, options);
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/**
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* room size control values between [0,1]
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* @type {NormalRange}
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* @signal
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*/
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this.roomSize = new Tone.Signal(options.roomSize, Tone.Type.NormalRange);
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/**
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* scale the room size
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* @type {Tone.Scale}
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* @private
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*/
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this._scaleRoomSize = new Tone.Scale(-0.733, 0.197);
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/**
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* a series of allpass filters
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* @type {Array}
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* @private
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*/
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this._allpassFilters = [];
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/**
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* parallel feedback comb filters
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* @type {Array}
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* @private
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*/
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this._feedbackCombFilters = [];
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//make the allpass filters
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for (var af = 0; af < allpassFilterFreqs.length; af++){
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var allpass = this.context.createBiquadFilter();
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allpass.type = "allpass";
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allpass.frequency.value = allpassFilterFreqs[af];
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this._allpassFilters.push(allpass);
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}
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//and the comb filters
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for (var cf = 0; cf < combFilterDelayTimes.length; cf++){
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var fbcf = new Tone.FeedbackCombFilter(combFilterDelayTimes[cf], 0.1);
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this._scaleRoomSize.connect(fbcf.resonance);
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fbcf.resonance.value = combFilterResonances[cf];
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Tone.connect(this._allpassFilters[this._allpassFilters.length - 1], fbcf);
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if (cf < combFilterDelayTimes.length / 2){
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fbcf.connect(this.effectReturnL);
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} else {
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fbcf.connect(this.effectReturnR);
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}
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this._feedbackCombFilters.push(fbcf);
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}
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//chain the allpass filters together
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this.roomSize.connect(this._scaleRoomSize);
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Tone.connectSeries.apply(Tone, this._allpassFilters);
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this.effectSendL.connect(this._allpassFilters[0]);
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this.effectSendR.connect(this._allpassFilters[0]);
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this._readOnly(["roomSize"]);
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};
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Tone.extend(Tone.JCReverb, Tone.StereoEffect);
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/**
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* the default values
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* @static
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* @const
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* @type {Object}
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*/
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Tone.JCReverb.defaults = {
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"roomSize" : 0.5
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};
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/**
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* Clean up.
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* @returns {Tone.JCReverb} this
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*/
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Tone.JCReverb.prototype.dispose = function(){
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Tone.StereoEffect.prototype.dispose.call(this);
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for (var apf = 0; apf < this._allpassFilters.length; apf++){
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this._allpassFilters[apf].disconnect();
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this._allpassFilters[apf] = null;
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}
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this._allpassFilters = null;
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for (var fbcf = 0; fbcf < this._feedbackCombFilters.length; fbcf++){
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this._feedbackCombFilters[fbcf].dispose();
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this._feedbackCombFilters[fbcf] = null;
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}
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this._feedbackCombFilters = null;
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this._writable(["roomSize"]);
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this.roomSize.dispose();
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this.roomSize = null;
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this._scaleRoomSize.dispose();
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this._scaleRoomSize = null;
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return this;
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};
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export default Tone.JCReverb;
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