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,
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 = ;const WavDecoder = ;const Pitchfinder = ;// see below for optional constructor parameters.const detectPitch = ;const buffer = fs;const decoded = WavDecoderdecode; // get audio data from file using `wav-decoder`const float32Array = decodedchannelData0; // get a single channel of soundconst pitch = ; // 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 = ;const detectPitch = Pitchfinder;const myAudioBuffer = ; // assume this returns a WebAudio AudioBuffer objectconst float32Array = myAudioBuffer; // get a single channel of soundconst pitch = ; // 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 = ;const detectPitch = Pitchfinder;const frequencies = Pitchfinder;// or use multiple detectors for better accuracy at the cost of speed.const detectors = detectPitch Pitchfinder;const moreAccurateFrequencies = Pitchfinder;
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
no special config
- Integrate with
teoriaor 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