diff --git a/src/vocoder.js b/src/vocoder.js
index 1963c8a..4c3b020 100644
--- a/src/vocoder.js
+++ b/src/vocoder.js
@@ -1,68 +1,30 @@
var Tone = require('tone');
-var modulatorNode = null;
-var carrierNode = null;
-var vocoding = false;
-
-var FILTER_QUALITY = 6; // The Q value for the carrier and modulator filters
-
-// These are "placeholder" gain nodes - because the modulator and carrier will get swapped in
-// as they are loaded, it's easier to connect these nodes to all the bands, and the "real"
-// modulator & carrier AudioBufferSourceNodes connect to these.
-var modulatorInput = null;
-var carrierInput = null;
-
-var modulatorGain = null;
-var modulatorGainValue = 1.0;
-
-// noise node added to the carrier signal
-var noiseBuffer = null;
-var noiseNode = null;
-var noiseGain = null;
-var noiseGainValue = 0.2;
-
-// Carrier Synth oscillator stuff
-var oscillatorNode = null;
-var oscillatorType = 4; // CUSTOM
-var oscillatorGain = null;
-var oscillatorGainValue = 1.0;
-var oscillatorDetuneValue = 0;
-var FOURIER_SIZE = 4096;
-var SAWTOOTHBOOST = 0.40;
-
-// These are the arrays of nodes - the "columns" across the frequency band "rows"
-var modFilterBands = null; // tuned bandpass filters
-var modFilterPostGains = null; // post-filter gains.
-var heterodynes = null; // gain nodes used to multiply bandpass X sine
-var powers = null; // gain nodes used to multiply prev out by itself
-var lpFilters = null; // tuned LP filters to remove doubled copy of product
-var lpFilterPostGains = null; // gain nodes for tuning input to waveshapers
-var carrierBands = null; // tuned bandpass filters, same as modFilterBands but in carrier chain
-var carrierFilterPostGains = null; // post-bandpass gain adjustment
-var carrierBandGains = null; // these are the "control gains" driven by the lpFilters
-
-var vocoderBands;
-var numVocoderBands;
-
-var hpFilterGain = null;
-
-var outputGain;
-
-function Vocoder() {
+function Vocoder () {
Tone.Effect.call(this);
- outputGain = new Tone.Gain();
+ this.FILTER_QUALITY = 6; // The Q value for the carrier and modulator filters
- this.generateVocoderBands(55, 7040, 28);
+ this.modulatorInput = new Tone.Gain();
+ this.carrierInput = new Tone.Gain();
+ this.outputGain = new Tone.Gain();
+
+ this.oscillatorNode;
+
+ this.vocoderBands = this.generateVocoderBands(55, 7040, 10);
this.initBandpassFilters();
this.createCarrier();
- this.effectSend.connect(modulatorInput);
- outputGain.connect(this.effectReturn);
+ this.effectSend.connect(this.modulatorInput);
+ this.outputGain.connect(this.effectReturn);
}
Tone.extend(Vocoder, Tone.Effect);
+Vocoder.prototype.setCarrierOscFrequency = function (freq) {
+ this.oscillatorNode.frequency.rampTo(freq, 0.05);
+};
+
// this function will algorithmically re-calculate vocoder bands, distributing evenly
// from startFreq to endFreq, splitting evenly (logarhythmically) into a given numBands.
// The function places this info into the vocoderBands and numVocoderBands variables.
@@ -73,77 +35,54 @@ Vocoder.prototype.generateVocoderBands = function (startFreq, endFreq, numBands)
var centsPerBand = totalRangeInCents / numBands;
var scale = Math.pow( 2, centsPerBand / 1200 ); // This is the scaling for successive bands
- vocoderBands = [];
+ var vocoderBands = [];
var currentFreq = startFreq;
for (var i=0; i<numBands; i++) {
- vocoderBands[i] = new Object();
- vocoderBands[i].frequency = currentFreq;
- //console.log( "Band " + i + " centered at " + currentFreq + "Hz" );
- currentFreq = currentFreq * scale;
+ vocoderBands[i] = new Object();
+ vocoderBands[i].frequency = currentFreq;
+ //console.log( "Band " + i + " centered at " + currentFreq + "Hz" );
+ currentFreq = currentFreq * scale;
}
- numVocoderBands = numBands;
+ return vocoderBands;
};
-Vocoder.prototype.initBandpassFilters = function() {
- // When this function is called, the carrierNode and modulatorAnalyser
- // may not already be created. Create placeholder nodes for them.
- modulatorInput = Tone.context.createGain();
- carrierInput = Tone.context.createGain();
+Vocoder.prototype.initBandpassFilters = function () {
- if (modFilterBands == null)
- modFilterBands = new Array();
+ var modFilterBands = new Array(); // tuned bandpass filters
+ var modFilterPostGains = new Array(); // post-filter gains.
+ var heterodynes = new Array(); // gain nodes used to multiply bandpass X sine
+ var powers = new Array(); // gain nodes used to multiply prev out by itself
+ var lpFilters = new Array(); // tuned lowpass filters to remove doubled copy of product
+ var lpFilterPostGains = new Array(); // gain nodes for tuning input to waveshapers
+ var carrierBands = new Array(); // tuned bandpass filters, same as modFilterBands but in carrier chain
+ var carrierFilterPostGains = new Array(); // post-bandpass gain adjustment
+ var carrierBandGains = new Array(); // these are the "control gains" driven by the lpFilters
- if (modFilterPostGains == null)
- modFilterPostGains = new Array();
+ var waveShaperCurve = new Float32Array(65536);
+ // Populate with a "curve" that does an abs()
+ var n = 65536;
+ var n2 = n / 2;
- if (heterodynes == null)
- heterodynes = new Array();
-
- if (powers == null)
- powers = new Array();
-
- if (lpFilters == null)
- lpFilters = new Array();
-
- if (lpFilterPostGains == null)
- lpFilterPostGains = new Array();
-
- if (carrierBands == null)
- carrierBands = new Array();
-
- if (carrierFilterPostGains == null)
- carrierFilterPostGains = new Array();
-
- if (carrierBandGains == null)
- carrierBandGains = new Array();
-
- var waveShaperCurve = new Float32Array(65536);
- // Populate with a "curve" that does an abs()
- var n = 65536;
- var n2 = n / 2;
-
- for (var i = 0; i < n2; ++i) {
+ for (var i = 0; i < n2; ++i) {
var x = i / n2;
-
waveShaperCurve[n2 + i] = x;
waveShaperCurve[n2 - i - 1] = x;
- }
+ }
// Set up a high-pass filter to add back in the fricatives, etc.
- // (this isn't used by default in the "production" version, as I hid the slider)
var hpFilter = Tone.context.createBiquadFilter();
- hpFilter.type = "highpass";
- hpFilter.frequency.value = 8000; // or use vocoderBands[numVocoderBands-1].frequency;
+ hpFilter.type = 'highpass';
+ hpFilter.frequency.value = 8000;
hpFilter.Q.value = 1; // no peaking
- modulatorInput.connect( hpFilter);
+ this.modulatorInput.connect( hpFilter);
- hpFilterGain = Tone.context.createGain();
- hpFilterGain.gain.value = 0.0;
+ var hpFilterGain = Tone.context.createGain();
+ hpFilterGain.gain.value = 1.0;
- hpFilter.connect( hpFilterGain );
- hpFilterGain.connect( outputGain );
+ hpFilter.connect(hpFilterGain);
+ hpFilterGain.connect(this.outputGain);
//clear the arrays
modFilterBands.length = 0;
@@ -157,116 +96,116 @@ Vocoder.prototype.initBandpassFilters = function() {
carrierBandGains.length = 0;
var rectifierCurve = new Float32Array(65536);
- for (var i=-32768; i<32768; i++)
- rectifierCurve[i+32768] = ((i>0)?i:-i)/32768;
+ for (i=-32768; i<32768; i++) {
+ rectifierCurve[i+32768] = ((i>0)?i:-i)/32768;
+ }
- for (var i=0; i<numVocoderBands; i++) {
- // CREATE THE MODULATOR CHAIN
- // create the bandpass filter in the modulator chain
- var modulatorFilter = Tone.context.createBiquadFilter();
- modulatorFilter.type = "bandpass"; // Bandpass filter
- modulatorFilter.frequency.value = vocoderBands[i].frequency;
- modulatorFilter.Q.value = FILTER_QUALITY; // initial quality
- modulatorInput.connect(modulatorFilter);
- modFilterBands.push(modulatorFilter);
+ for (i=0; i<this.vocoderBands.length; i++) {
+ // CREATE THE MODULATOR CHAIN
+ // create the bandpass filter in the modulator chain
+ var modulatorFilter = Tone.context.createBiquadFilter();
+ modulatorFilter.type = 'bandpass'; // Bandpass filter
+ modulatorFilter.frequency.value = this.vocoderBands[i].frequency;
+ modulatorFilter.Q.value = this.FILTER_QUALITY; // initial quality
+ this.modulatorInput.connect(modulatorFilter);
+ modFilterBands.push(modulatorFilter);
- // Now, create a second bandpass filter tuned to the same frequency -
- // this turns our second-order filter into a 4th-order filter,
- // which has a steeper rolloff/octave
- var secondModulatorFilter = Tone.context.createBiquadFilter();
- secondModulatorFilter.type = "bandpass"; // Bandpass filter
- secondModulatorFilter.frequency.value = vocoderBands[i].frequency;
- secondModulatorFilter.Q.value = FILTER_QUALITY; // initial quality
- modulatorFilter.chainedFilter = secondModulatorFilter;
- modulatorFilter.connect(secondModulatorFilter);
+ // Now, create a second bandpass filter tuned to the same frequency -
+ // this turns our second-order filter into a 4th-order filter,
+ // which has a steeper rolloff/octave
+ var secondModulatorFilter = Tone.context.createBiquadFilter();
+ secondModulatorFilter.type = 'bandpass'; // Bandpass filter
+ secondModulatorFilter.frequency.value = this.vocoderBands[i].frequency;
+ secondModulatorFilter.Q.value = this.FILTER_QUALITY; // initial quality
+ modulatorFilter.chainedFilter = secondModulatorFilter;
+ modulatorFilter.connect(secondModulatorFilter);
- // create a post-filtering gain to bump the levels up.
- var modulatorFilterPostGain = Tone.context.createGain();
- modulatorFilterPostGain.gain.value = 6;
- secondModulatorFilter.connect(modulatorFilterPostGain);
- modFilterPostGains.push(modulatorFilterPostGain);
+ // create a post-filtering gain to bump the levels up.
+ var modulatorFilterPostGain = Tone.context.createGain();
+ modulatorFilterPostGain.gain.value = 6;
+ secondModulatorFilter.connect(modulatorFilterPostGain);
+ modFilterPostGains.push(modulatorFilterPostGain);
- // Create the sine oscillator for the heterodyne
- var heterodyneOscillator = Tone.context.createOscillator();
- heterodyneOscillator.frequency.value = vocoderBands[i].frequency;
+ // Create the sine oscillator for the heterodyne
+ var heterodyneOscillator = Tone.context.createOscillator();
+ heterodyneOscillator.frequency.value = this.vocoderBands[i].frequency;
- heterodyneOscillator.start(0);
+ heterodyneOscillator.start(0);
- // Create the node to multiply the sine by the modulator
- var heterodyne = Tone.context.createGain();
- modulatorFilterPostGain.connect(heterodyne);
- heterodyne.gain.value = 0.0; // audio-rate inputs are summed with initial intrinsic value
- heterodyneOscillator.connect(heterodyne.gain);
+ // Create the node to multiply the sine by the modulator
+ var heterodyne = Tone.context.createGain();
+ modulatorFilterPostGain.connect(heterodyne);
+ heterodyne.gain.value = 0.0; // audio-rate inputs are summed with initial intrinsic value
+ heterodyneOscillator.connect(heterodyne.gain);
- var heterodynePostGain = Tone.context.createGain();
- heterodynePostGain.gain.value = 2.0; // GUESS: boost
- heterodyne.connect(heterodynePostGain);
- heterodynes.push(heterodynePostGain);
+ var heterodynePostGain = Tone.context.createGain();
+ heterodynePostGain.gain.value = 2.0; // GUESS: boost
+ heterodyne.connect(heterodynePostGain);
+ heterodynes.push(heterodynePostGain);
- // Create the rectifier node
- var rectifier = Tone.context.createWaveShaper();
- rectifier.curve = rectifierCurve;
- heterodynePostGain.connect(rectifier);
+ // Create the rectifier node
+ var rectifier = Tone.context.createWaveShaper();
+ rectifier.curve = rectifierCurve;
+ heterodynePostGain.connect(rectifier);
- // Create the lowpass filter to mask off the difference (near zero)
- var lpFilter = Tone.context.createBiquadFilter();
- lpFilter.type = "lowpass"; // Lowpass filter
- lpFilter.frequency.value = 5.0; // Guesstimate! Mask off 20Hz and above.
- lpFilter.Q.value = 1; // don't need a peak
- lpFilters.push(lpFilter);
- rectifier.connect(lpFilter);
+ // Create the lowpass filter to mask off the difference (near zero)
+ var lpFilter = Tone.context.createBiquadFilter();
+ lpFilter.type = "lowpass"; // Lowpass filter
+ lpFilter.frequency.value = 5.0; // Guesstimate! Mask off 20Hz and above.
+ lpFilter.Q.value = 1; // don't need a peak
+ lpFilters.push(lpFilter);
+ rectifier.connect(lpFilter);
- var lpFilterPostGain = Tone.context.createGain();
- lpFilterPostGain.gain.value = 1.0;
- lpFilter.connect(lpFilterPostGain);
- lpFilterPostGains.push(lpFilterPostGain);
+ var lpFilterPostGain = Tone.context.createGain();
+ lpFilterPostGain.gain.value = 1.0;
+ lpFilter.connect(lpFilterPostGain);
+ lpFilterPostGains.push(lpFilterPostGain);
- var waveshaper = Tone.context.createWaveShaper();
- waveshaper.curve = waveShaperCurve;
- lpFilterPostGain.connect(waveshaper);
+ var waveshaper = Tone.context.createWaveShaper();
+ waveshaper.curve = waveShaperCurve;
+ lpFilterPostGain.connect(waveshaper);
- // Create the bandpass filter in the carrier chain
- var carrierFilter = Tone.context.createBiquadFilter();
- carrierFilter.type = "bandpass";
- carrierFilter.frequency.value = vocoderBands[i].frequency;
- carrierFilter.Q.value = FILTER_QUALITY;
- carrierBands.push(carrierFilter);
- carrierInput.connect(carrierFilter);
+ // Create the bandpass filter in the carrier chain
+ var carrierFilter = Tone.context.createBiquadFilter();
+ carrierFilter.type = 'bandpass';
+ carrierFilter.frequency.value = this.vocoderBands[i].frequency;
+ carrierFilter.Q.value = this.FILTER_QUALITY;
+ carrierBands.push(carrierFilter);
+ this.carrierInput.connect(carrierFilter);
- // We want our carrier filters to be 4th-order filter too.
- var secondCarrierFilter = Tone.context.createBiquadFilter();
- secondCarrierFilter.type = "bandpass"; // Bandpass filter
- secondCarrierFilter.frequency.value = vocoderBands[i].frequency;
- secondCarrierFilter.Q.value = FILTER_QUALITY; // initial quality
- carrierFilter.chainedFilter = secondCarrierFilter;
- carrierFilter.connect(secondCarrierFilter);
+ // We want our carrier filters to be 4th-order filter too.
+ var secondCarrierFilter = Tone.context.createBiquadFilter();
+ secondCarrierFilter.type = 'bandpass'; // Bandpass filter
+ secondCarrierFilter.frequency.value = this.vocoderBands[i].frequency;
+ secondCarrierFilter.Q.value = this.FILTER_QUALITY; // initial quality
+ carrierFilter.chainedFilter = secondCarrierFilter;
+ carrierFilter.connect(secondCarrierFilter);
- var carrierFilterPostGain = Tone.context.createGain();
- carrierFilterPostGain.gain.value = 10.0;
- secondCarrierFilter.connect(carrierFilterPostGain);
- carrierFilterPostGains.push(carrierFilterPostGain);
+ var carrierFilterPostGain = Tone.context.createGain();
+ carrierFilterPostGain.gain.value = 10.0;
+ secondCarrierFilter.connect(carrierFilterPostGain);
+ carrierFilterPostGains.push(carrierFilterPostGain);
- // Create the carrier band gain node
- var bandGain = Tone.context.createGain();
- carrierBandGains.push(bandGain);
- carrierFilterPostGain.connect(bandGain);
- bandGain.gain.value = 0.0; // audio-rate inputs are summed with initial intrinsic value
- waveshaper.connect(bandGain.gain); // connect the lp controller
+ // Create the carrier band gain node
+ var bandGain = Tone.context.createGain();
+ carrierBandGains.push(bandGain);
+ carrierFilterPostGain.connect(bandGain);
+ bandGain.gain.value = 0.0; // audio-rate inputs are summed with initial intrinsic value
+ waveshaper.connect(bandGain.gain); // connect the lp controller
- bandGain.connect(outputGain);
+ bandGain.connect(this.outputGain);
}
};
Vocoder.prototype.createCarrier = function () {
- oscillatorNode = new Tone.Oscillator(110, 'sawtooth8').start();
- oscillatorNode.connect(carrierInput);
+ this.oscillatorNode = new Tone.Oscillator('C3', 'sawtooth').start();
+ this.oscillatorNode.connect(this.carrierInput);
- noiseNode = new Tone.Noise('white').start();
- noiseGain = new Tone.Gain(noiseGainValue);
- noiseNode.connect(noiseGain);
- noiseGain.connect(carrierInput);
- }
+ var noiseNode = new Tone.Noise('white').start();
+ noiseNode.volume.value = -12;
+ noiseNode.connect(this.carrierInput);
+};
module.exports = Vocoder;