detect-pitch
Detects the pitch of a signal using the autocorrelation method.
Example
var detectPitch = var n = 1024var ω = 20 * MathPI / n //Initialize signalvar signal = nforvar i=0; i<n; ++i signali = Math console //Prints out://// 100//
Install
npm install detect-pitch
require('detect-pitch')(signal[, threshold])
Detects the pitch of signal
by computing the period by autocorrelation.
signal
is a snippet of an audio signal. Represented as either a typed array or an ndarray.threshold
is an optional parameter between0
and1
which determines the cutoff for reporting a successful detection. Higher values indicate stricture cutoff. Default is0
Returns The number of samples in the period of the signal. If no pitch was detected, returns 0
. To recover the pitch frequency, you need to divide the sample rate by this number (note that this will be NaN
for signals with no pitch):
var pitchInHz = sampleRateInHz / periodInSamples
Credits
(c) 2013-2015 Mikola Lysenko. MIT License