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