Voice Activity Detection by Spectral Energy by MATLAB

Tutorial #3

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Description

1. Speech activity detection (VAD) by spectral energy
2. Return end points of their sample index

Function

[activeNum, pos] = vad_YW(speech, fs, plotMode, activeBuffer, activeMax, energyTh2)

• Required Input Parameters

speech  Speech data
fs      Sampling frequency (Hz)

• Optional Input Parameters

plotMode      0: don't plot anything
              1: plot VAD result in time domain signal
              2: plot all of segments of active parts respectively
              3: plot all of above mentioned
activeBuffer  Buffer range in two sides (sec)
activeMax     Max active length (sec)
energyTh2     Under spectral energy for removal

• Output Parameters

activeNum  The amount of active speech segment
pos        Active segments samples position

Example

Input a audio file.

[ speech, fs] = audioread( 'Music_SNR_5_0.wav' );

Execute the VAD and plotMode is 3

[ activeNum, pos] = vad_YW(speech, fs, 3);

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