Speech onset from audio, wav file

Hi, is it possible to use amplitudes to mark when someone started speaking? I have wav files and I have extracted amplitudes and times but I'm not sure how I would check for a change in amplitude from 0 that would correspond to speech onset (or any sound trigger).

Any help would be greatly appreciated.

Thanks.

Answer 1

[Abhishek Ballaney]

Try find(x>0) & use 1st index