digitalsignals

DSP.js

DSP.js is a comprehensive digital signal processing library for javascript.
It includes many functions for signal analysis and generation, including
Oscillators(sine, saw, square, triangle), Window functions (Hann, Hamming, etc),
Envelopes(ADSR), IIR Filters(lowpass, highpass, bandpass, notch), FFT and DFT
transforms, Delays, Reverb.

Modules:

DFT(bufferSize, sampleRate): Discrete Fourier Transform

Usage:

var dft = new DFT(1024, 44100);
dft.forward(signal);
var spectrum = dft.spectrum;

FFT(bufferSize, sampleRate): Fast Fourier Transform

Usage:

var fft = new FFT(2048, 44100);
fft.forward(signal);
var spectrum = fft.spectrum;

Oscillator(waveform, frequency, amplitude, bufferSize, sampleRate): Signal Generator
* Sine wave
* Square wave
* Saw wave
* Triangle wave

Usage:

var osc = new Oscillator(SINEWAVE, 440, 1, 2048, 22050);
osc.generate();
var signal = osc.signal;

ADSR(attack, decay, sustainLevel, sustain, release, sampleRate): Attack-Decay-Sustain-Release Envelope

Usage:

var envelope = new ADSR(0.01, 0.1, 0.5, 0.1, 0.2, 44100);
envelope.process(signal);

IIRFilter(filter, cutoff, sampleRate): Infinite Impulse Response Filters
* Low Pass Filter
* High Pass Filter

Usage:

var filter = IIRFilter(LOWPASS, 200, 44100);
filter.process(signal);

MultiDelay(maxDelayInSamplesSize, delayInSamples, masterVolume, delayVolume): Delay which feeds back its own delayed signal

Usage:

var delay = MultiDelay(441005, 441001, 1.0, 0.6);
delay.process(signal);

Reverb(maxDelayInSamplesSize, delayInSamples, masterVolume, mixVolume, delayVolume, dampFrequency): Reverb

Usage:

var reverb = Reverb(20000, 6500, 0.8, 0.5, 0.9, 4500);
reverb.process(signal);

@corban weare.buildingsky.net
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Copyright (c) 2010 Corban Brook, released under the MIT license