Audio Data API JS Library

Introduction

This page is a brainstorming and spec page for a JS library based on the Audio Data API.

http://github.com/corbanbrook/dsp.js

Currently it has js FFT, DFT, Oscillators (sine, square, triangle, saw), envelopes, IIR Filters, Window functions

Ideas

• < sanchothefat> I'd like to see a similar api to jquery or pjs style eg. a = new Audio(); a.wave('sine');

• extract stuff from bloop, synth, squarewave, etc.

DSP.js

The current documentation for DSP.js is as follows:

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.

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);