mirror of
https://github.com/Tonejs/Tone.js
synced 2024-12-28 04:23:15 +00:00
108 lines
2.4 KiB
JavaScript
108 lines
2.4 KiB
JavaScript
import Tone from "../core/Tone";
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import "../signal/WaveShaper";
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import "../signal/Multiply";
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import "../signal/Subtract";
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/**
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* @class Signal-rate modulo operator. Only works in AudioRange [-1, 1] and for modulus
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* values in the NormalRange.
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*
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* @constructor
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* @extends {Tone.SignalBase}
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* @param {NormalRange} modulus The modulus to apply.
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* @example
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* var mod = new Tone.Modulo(0.2)
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* var sig = new Tone.Signal(0.5).connect(mod);
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* //mod outputs 0.1
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*/
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Tone.Modulo = function(modulus){
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Tone.SignalBase.call(this);
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this.createInsOuts(1, 0);
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/**
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* A waveshaper gets the integer multiple of
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* the input signal and the modulus.
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* @private
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* @type {Tone.WaveShaper}
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*/
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this._shaper = new Tone.WaveShaper(Math.pow(2, 16));
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/**
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* the integer multiple is multiplied by the modulus
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* @type {Tone.Multiply}
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* @private
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*/
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this._multiply = new Tone.Multiply();
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/**
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* and subtracted from the input signal
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* @type {Tone.Subtract}
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* @private
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*/
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this._subtract = this.output = new Tone.Subtract();
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/**
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* the modulus signal
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* @type {Tone.Signal}
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* @private
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*/
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this._modSignal = new Tone.Signal(modulus);
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//connections
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Tone.connect(this.input, this._shaper);
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Tone.connect(this.input, this._subtract);
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this._modSignal.connect(this._multiply, 0, 0);
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this._shaper.connect(this._multiply, 0, 1);
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this._multiply.connect(this._subtract, 0, 1);
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this._setWaveShaper(modulus);
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};
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Tone.extend(Tone.Modulo, Tone.SignalBase);
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/**
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* @param {number} mod the modulus to apply
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* @private
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*/
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Tone.Modulo.prototype._setWaveShaper = function(mod){
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this._shaper.setMap(function(val){
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var multiple = Math.floor((val + 0.0001) / mod);
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return multiple;
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});
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};
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/**
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* The modulus value.
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* @memberOf Tone.Modulo#
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* @type {NormalRange}
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* @name value
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*/
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Object.defineProperty(Tone.Modulo.prototype, "value", {
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get : function(){
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return this._modSignal.value;
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},
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set : function(mod){
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this._modSignal.value = mod;
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this._setWaveShaper(mod);
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}
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});
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/**
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* clean up
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* @returns {Tone.Modulo} this
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*/
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Tone.Modulo.prototype.dispose = function(){
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Tone.SignalBase.prototype.dispose.call(this);
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this._shaper.dispose();
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this._shaper = null;
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this._multiply.dispose();
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this._multiply = null;
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this._subtract.dispose();
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this._subtract = null;
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this._modSignal.dispose();
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this._modSignal = null;
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return this;
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};
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export default Tone.Modulo;
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