mirror of
https://github.com/Tonejs/Tone.js
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77 lines
No EOL
1.9 KiB
JavaScript
77 lines
No EOL
1.9 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/Expr", "Tone/signal/Signal", "Tone/component/Split"],
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function(Tone){
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"use strict";
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/**
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* @class Seperates the mid channel from the side channel. Has two outputs labeled
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* `mid` and `side` or `output[0]` and `output[1]`. <br>
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* http://musicdsp.org/showArchiveComment.php?ArchiveID=173<br>
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* http://www.kvraudio.com/forum/viewtopic.php?t=212587<br>
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* M = (L+R)/sqrt(2); // obtain mid-signal from left and right<br>
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* S = (L-R)/sqrt(2); // obtain side-signal from left and righ<br>
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*
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* @extends {Tone}
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* @constructor
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*/
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Tone.MidSideSplit = function(){
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Tone.call(this, 0, 2);
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/**
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* split the incoming signal into left and right channels
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* @type {Tone.Split}
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* @private
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*/
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this._split = this.input = new Tone.Split();
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/**
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* The mid send. Connect to mid processing.
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* @type {Tone.Expr}
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*/
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this.mid = this.output[0] = new Tone.Expr("($0 + $1) * $2");
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/**
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* The side output. Connect to side processing.
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* @type {Tone.Expr}
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*/
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this.side = this.output[1] = new Tone.Expr("($0 - $1) * $2");
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this._split.connect(this.mid, 0, 0);
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this._split.connect(this.mid, 1, 1);
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this._split.connect(this.side, 0, 0);
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this._split.connect(this.side, 1, 1);
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sqrtTwo.connect(this.mid, 0, 2);
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sqrtTwo.connect(this.side, 0, 2);
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};
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Tone.extend(Tone.MidSideSplit);
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/**
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* a constant signal equal to 1 / sqrt(2)
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* @type {Tone.Signal}
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* @private
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* @static
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*/
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var sqrtTwo = null;
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Tone._initAudioContext(function(){
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sqrtTwo = new Tone.Signal(1 / Math.sqrt(2));
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});
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/**
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* clean up
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* @returns {Tone.MidSideSplit} `this`
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*/
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Tone.MidSideSplit.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this.mid.dispose();
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this.mid = null;
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this.side.dispose();
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this.side = null;
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this._split.dispose();
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this._split = null;
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return this;
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};
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return Tone.MidSideSplit;
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}); |