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threshold a signal between -1 and 1

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This commit is contained in:
Yotam Mann 2014-07-02 17:07:40 -04:00
parent 2d32b38bb7
commit e0bbf3b460
1 changed files with 30 additions and 5 deletions
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35
Tone/signal/Threshold.js
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@ -15,18 +15,32 @@ define(["Tone/core/Tone"], function(Tone){
* @extends {Tone}
*/
Tone.Threshold = function(thresh){
/**
* @type {WaveShaperNode}
* @private
*/
this._thresh = this.context.createWaveShaper();
/**
* make doubly sure that the input is thresholded by
* passing it through two waveshapers
*
* @type {WaveShaperNode}
* @private
*/
this._doubleThresh = this.context.createWaveShaper();
/**
* @type {WaveShaperNode}
*/
this.input = this.output = this._thresh;
this.input = this._thresh;
this.output = this._doubleThresh;
this._setThresh(this.defaultArg(thresh, 0));
this._thresh.connect(this._doubleThresh);
this._setThresh(this._thresh, this.defaultArg(thresh, 0));
this._setThresh(this._doubleThresh, 1);
};
Tone.extend(Tone.Threshold);
@ -35,11 +49,11 @@ define(["Tone/core/Tone"], function(Tone){
* @param {number} thresh
* @private
*/
Tone.Threshold.prototype._setThresh = function(thresh){
Tone.Threshold.prototype._setThresh = function(component, thresh){
var curveLength = 1024;
var curve = new Float32Array(curveLength);
for (var i = 0; i < curveLength; i++){
var normalized = (i / (curveLength - 1));
var normalized = (i / (curveLength - 1)) * 2 - 1;
var val;
if (normalized < thresh){
val = 0;
@ -48,7 +62,16 @@ define(["Tone/core/Tone"], function(Tone){
}
curve[i] = val;
}
this._thresh.curve = curve;
component.curve = curve;
};
/**
* sets the threshold value
*
* @param {number} thresh number must be between -1 and 1
*/
Tone.Threshold.prototype.setThreshold = function(thresh){
this._setThresh(this._thresh, thresh);
};
/**
@ -56,7 +79,9 @@ define(["Tone/core/Tone"], function(Tone){
*/
Tone.Threshold.prototype.dispose = function(){
this._thresh.disconnect();
this._doubleThresh.disconnect();
this._thresh = null;
this._doubleThresh = null;
};
return Tone.Threshold;