Sound Card Input

[Andrews, A.S.]

I would like to use a sound card input as a voice key (i.e. detect the onset of a sound). I have already used hardware voice keys (which close a contact, read by the parallel port), but now I need more and as all our PCs already have a soundcard (SoundBlaster PCI-128's) I was hoping someone could suggest how to do this?
 
Many Thanks
 
Tony Andrews
Senior Computer Officer
School of Psychology
University of Leicester.
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