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3 band EQ
low/mid/high gain controls and control of crossover frequencies
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Yotam Mann
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3afd45f987
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1 changed files with 181 additions and 0 deletions
181
Tone/component/EQ.js
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181
Tone/component/EQ.js
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define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/component/Filter"], function(Tone){
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/**
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* @class A 3 band EQ with control over low, mid, and high gain as
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* well as the low and high crossover frequencies.
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*
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* @constructor
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* @extends {Tone}
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*
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* @param {number|object=} [lowLevel=1] the gain applied to the low
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* @param {number=} [midLevel=1] the gain applied to the mid
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* @param {number=} [highLevel=1] the gain applied to the high
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*/
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Tone.EQ = function(lowLevel, midLevel, highLevel){
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Tone.call(this);
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//set the defaults
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var options;
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if (arguments.length === 1 && typeof freq === "object"){
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options = lowLevel;
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} else {
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options = {
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"low" : lowLevel,
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"mid" : midLevel,
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"high" : highLevel
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};
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}
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options = this.defaultArg(options, this._defaults);
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/**
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* the low band
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* @type {Tone.Filter}
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* @private
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*/
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this._lowFilter = new Tone.Filter(0, "lowpass");
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/**
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* the lower filter of the mid band
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* @type {Tone.Filter}
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* @private
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*/
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this._lowMidFilter = new Tone.Filter(0, "highpass");
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/**
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* the lower filter of the mid band
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* @type {Tone.Filter}
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* @private
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*/
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this._highMidFilter = new Tone.Filter(0, "lowpass");
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/**
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* the high filter
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* @type {Tone.Filter}
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* @private
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*/
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this._highFilter = new Tone.Filter(0, "highpass");
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/**
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* the crossover frequency for lows
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* @type {Tone.Signal}
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*/
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this.lowFrequency = new Tone.Signal(options.lowFrequency);
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/**
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* the crossover frequency for highs
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* @type {Tone.Signal}
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*/
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this.highFrequency = new Tone.Signal(options.highFrequency);
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/**
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* the low gain
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* @type {GainNode}
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*/
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this.lowGain = this.context.createGain();
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this.lowGain.gain.value = options.low;
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/**
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* the mid gain
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* @type {GainNode}
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*/
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this.midGain = this.context.createGain();
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this.midGain.gain.value = options.mid;
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/**
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* the high gain
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* @type {GainNode}
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*/
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this.highGain = this.context.createGain();
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this.highGain.gain.value = options.high;
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//the frequency bands
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this.chain(this.input, this._lowFilter, this.lowGain, this.output);
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this.chain(this.input, this._lowMidFilter, this._highMidFilter, this.midGain, this.output);
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this.chain(this.input, this._highFilter, this.highGain, this.output);
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//frequency control
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this.lowFrequency.connect(this._lowFilter.frequency);
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this.lowFrequency.connect(this._lowMidFilter.frequency);
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this.highFrequency.connect(this._highMidFilter.frequency);
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this.highFrequency.connect(this._highFilter.frequency);
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};
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Tone.extend(Tone.EQ);
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/**
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* the default values
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* @type {Object}
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* @private
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* @static
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*/
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Tone.EQ.prototype._defaults = {
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"low" : 1,
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"mid" : 1,
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"high" : 1,
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"lowFrequency" : 400,
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"highFrequency" : 2500
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};
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/**
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* set the values in bulk
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* @param {object} params the parameters
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*/
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Tone.EQ.prototype.set = function(params){
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if (!this.isUndef(params.mid)) this.setMid(params.mid);
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if (!this.isUndef(params.high)) this.setHigh(params.high);
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if (!this.isUndef(params.low)) this.setLow(params.low);
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if (!this.isUndef(params.lowFrequency)) this.lowFrequency.setValue(params.lowFrequency);
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if (!this.isUndef(params.highFrequency)) this.highFrequency.setValue(params.highFrequency);
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};
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/**
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* set the mid range
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* @param {number} level the level of the mids
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*/
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Tone.EQ.prototype.setMid = function(level){
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this.midGain.gain.value = level;
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};
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/**
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* set the high range
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* @param {number} level the level of the highs
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*/
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Tone.EQ.prototype.setHigh = function(level){
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this.highGain.gain.value = level;
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};
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/**
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* set the low range
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* @param {number} level the level of the lows
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*/
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Tone.EQ.prototype.setLow = function(level){
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this.lowGain.gain.value = level;
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};
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/**
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* clean up
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*/
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Tone.EQ.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this._lowFilter.dispose();
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this._lowMidFilter.dispose();
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this._highMidFilter.dispose();
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this._highFilter.dispose();
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this.lowFrequency.dispose();
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this.highFrequency.dispose();
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this.lowGain.disconnect();
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this.midGain.disconnect();
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this.highGain.disconnect();
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this._lowFilter = null;
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this._lowMidFilter = null;
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this._highMidFilter = null;
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this._highFilter = null;
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this.lowFrequency = null;
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this.highFrequency = null;
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this.lowGain = null;
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this.midGain = null;
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this.highGain = null;
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};
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return Tone.EQ;
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});
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