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(44100*5, 44100*1, 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
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Copyright (c) 2010 Corban Brook, released under the MIT license