Detects the pitch of an audio snippet


Detects the pitch of a signal using the autocorrelation method.

var detectPitch = require("detect-pitch")
var n = 1024
var signal = new Float32Array(n)
var omega = 2.0 * Math.PI / n
for(var i=0; i<n; ++i) {
  signal[i] = Math.sin(100 * i * omega)
//Prints out: 
//    100 
npm install detect-pitch

Detects the pitch of signal

  • signal is a (possibly windowed) snippet of an audio signal. Represented as either a typed array or an ndarray.

  • options is an object containing optional arguments to the function:

    • options.threshold a float between [0,1] that determines how intense a peak needs to be before it is consider a pitch. (Default 0.9)
    • options.start_bin an integer representing 1/lowest freqeuency. (Default 16)

Returns The frequency of the pitch of the signal. To recover the period compute pitch / signal.length

(c) 2013 Mikola Lysenko. MIT License