Real Time Voice Activity Detection by Spectral Energy by MATLAB

Tutorial #4

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Description

1. Plot signal wave in time or frequency domain
2. Choose x-axis as time or samples
3. Remove spectral energy under a value when show the spectrogram

Function

sys = vadRealTime_YW(fs, screen, th)

• Required Input Parameters

fs          Sampling frequency (Hz). Default is 16k.
screen      Screen width to show signal (sec). Default is 2 sec.
th          Threshold energy for removal. Default is 100.

Example

Start the system by sample rate 16k and show 2 seconds signal.

sys = realTime_YW(16000, 2, 100);

Stop the system.

stop(sys.clock);
stop(sys.recorder);

Get the record speech, plot and play it.

s = getaudiodata(sys.recorder);
figure;
plot(s);
sound(s,16000);

👉 Tutorial Outline 👈