Beat per Minutes calculation

Copyright 2012, Eng Eder de Souza

Matlab/Octave source for beat track calculation!

The approach used in this code are described by George Tzanetakis, the beat calculation is made breaking the signal in sub-band frequencies using DWT(Discrete wavelet transform), After get all sub-bands we need envelope each band, sum all Envelopes to a single onset strength signal and apply auto-correlation to find the peak position.

    Tempo Extraction Steps:

DWT(Discrete wavelet transform)

Decompose the signal in six frequency bands (six level) using DWT

Envelope extraction from sub-bands

*Envelope Calculation

Apply Full Wave Rectification

Apply Low Pass Filter

Apply Downsample

Apply Mean Removal

Autocorrelation

Find Beat per Minutes

Beat Examples in the folder [AudioTest] (https://github.com/ederwander/Beat-Track/tree/master/AudioTest)

How use:

    BPM=RunBPM('AudioTest/B128.wav')

Special thanks to George Tzanetakis who helped me at some points by email !

Eng Eder de Souza