pitch-shift-node

Pitch shift node for WebAudioApi. Using the pitch-shift library to do the shifting.

Living exmaple can be find here

Install

npm install pitch-shift-node

API

var PitchShiftNode = require('pitch-shift-node')

PitchShiftNode(audioContext,pitchShift,options)

create and return an AudioNode instance

• audioContext WebAudioApi audio context
• pitchShift number to scale the samples by
• options An object full of options to pass to the pitch shifter
  • frameSize size of frame to process (default 512)
  • hopSize the distance between frames in samples. Must divide frame size. (default frameSize/4)
  • dataSize maximal allowable size of a data frame (default frameSize)
  • sampleRate Conversion factor from samples to seconds. (default 44100)
  • analysiWindow analysis window. must be a typed array with length equl to frame size (defaults to Hann window)
  • synthesisWindow synthesis window. must be a typed array with length equal to frame size (defaults to Hann window)
  • threshold peak detection threshold. Set to 1.0 to always take maximum, otherwise set lower to detect half tones. (default 0.9)
  • minPeriod Minimal resolvable period. (default sampleRate/400)

Example

Here is a simple example of using the pitch node.

var PitchShiftNode = require('pitch-shift-node');
 
var source = context.createBufferSource();
source.buffer = myBuffer;
 
//Create pitch shift node that scale samples by 1.25
var pitchNode = new PitchShiftNode(context,1.25);
 
source.connect(pitchNode);
pitchNode.connect(context.destination);

Test And Play

# First install all the NPM tools:
npm install

Then run npm scripts:

#Building the example page
npm run build

#Host build example on port 3000
npm run example

Credits

(c) 2016 Chen Machluf. MIT License

Gettysburg adress reading by Britton Rea. Recording obtained from the Internet archive. http://archive.org/details/GettysburgAddress