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    A compilation of pitch detection algorithms for Javascript. Supports both the browser and node.

    A note on versions

    This library previous consisted of a single script tag to be included in the browser. I'm deprecating that version and replacing it with a new, npm/babel version. If you have been using the old version, please check out the legacy branch, which consists of the old code. However, I will not be supporting it going forwards. Version 2 is bringing many improvements, unit tests, and more.

    If you'd like a version that uses compiled C++ code and runs much faster, check out this repo. However, it will not work in the browser.

    Provided pitch-finding algorithms

    • YIN - The best balance of accuracy and speed, in my experience. Occasionally provides values that are wildly incorrect.
    • AMDF - Slow and only accurate to around +/- 2%, but finds a frequency more consistenly than others.
    • Dynamic Wavelet - Very fast, but struggles to identify lower frequencies.
    • YIN w/ FFT (coming soon)
    • Goertzel (coming soon)
    • Mcleod (coming soon)


    npm install --save pitchfinder


    Finding the pitch of a wav file in node

    All pitchfinding algorithms provided operate on Float32Arrays. To find the pitch of a wav file, we can use the wav-decoder library to extract the data into such an array.

    const fs = require("fs");
    const WavDecoder = require("wav-decoder");
    const Pitchfinder = require("pitchfinder");
    // see below for optional constructor parameters.
    const detectPitch = new Pitchfinder.YIN();
    const buffer = fs.readFileSync(PATH_TO_FILE);
    const decoded = WavDecoder.decode.sync(buffer); // get audio data from file using `wav-decoder`
    const float32Array = decoded.channelData[0]; // get a single channel of sound
    const pitch = detectPitch(float32Array); // null if pitch cannot be identified

    Finding the pitch of a WebAudio AudioBuffer in the browser

    This assumes you are using an npm-compatible build system, like Webpack or Browserify, and that your target browser supports WebAudio. Ample documentation on WebAudio is available online, especially on Mozilla's MDN.

    const Pitchfinder = require("pitchfinder");
    const detectPitch = Pitchfinder.AMDF();
    const myAudioBuffer = getAudioBuffer(); // assume this returns a WebAudio AudioBuffer object
    const float32Array = myAudioBuffer.getChannelData(0); // get a single channel of sound
    const pitch = detectPitch(float32Array); // null if pitch cannot be identified

    Finding a series of pitches

    Set a tempo and a quantization interval, and an array of pitches at each interval will be returned.

    const Pitchfinder = require("pitchfinder");
    const detectPitch = Pitchfinder.YIN();
    const frequencies = Pitchfinder.frequencies(detectPitch, float32Array, {
      tempo: 130, // in BPM, defaults to 120
      quantization: 4, // samples per beat, defaults to 4 (i.e. 16th notes)
    // or use multiple detectors for better accuracy at the cost of speed.
    const detectors = [detectPitch, Pitchfinder.AMDF()];
    const moreAccurateFrequencies = Pitchfinder.frequencies(detectors, float32Array, {
      tempo: 130, // in BPM, defaults to 120
      quantization: 4, // samples per beat, defaults to 4 (i.e. 16th notes)


    All detectors

    • sampleRate - defaults to 44100


    • threshold - used by the algorithm
    • probabilityThreshold - don't return a pitch if probability estimate is below this number.


    • minFrequency - Lowest frequency detectable
    • maxFrequency - Highest frequency detectable
    • sensitivity
    • ratio

    Dynamic Wavelet

    no special config


    • Integrate with teoria or another music theory tool to add more intelligent parsing.
    • Note-onsite algorithms.
    • Enable requiring of single detectors.


    Several of these algorithms were ported from Jonas Six's excellent TarsosDSP library (written in Java). If you're looking for a far deeper set of tools than this, check out his work on his website or on Github.

    Thanks to Aubio for his YIN code


    npm i pitchfinder

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