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    detect-pitchpublic

    detect-pitch

    Detects the pitch of a signal using the autocorrelation method.

    Example

    var detectPitch = require('detect-pitch')
     
    var n = 1024
    var ω = 2.0 * Math.PI / n
     
    //Initialize signal 
    var signal = new Float32Array(n)
    for(var i=0; i<n; ++i) {
      signal[i] = Math.sin(100 * i * ω)
    }
     
    console.log(Math.round(/ detectPitch(signal)))
     
    //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 between 0 and 1 which determines the cutoff for reporting a successful detection. Higher values indicate stricture cutoff. Default is 0

    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

    install

    npm i detect-pitch

    Downloadslast 7 days

    9

    version

    1.1.0

    license

    MIT

    repository

    github.com

    last publish

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