[LAD] Audio Trigger

Hi all,
I need to use a microphone input as a trigger. In other words my idea is
to connect a switch to the microphone input. In this way, when the
switch is turned on it generates a spike in the captured track.
I would like to create a program that trigger an event every spike it
receives.

I succeed in capturing the mic input through a simple program that uses
alsa driver, but I don't know how to "parse" the raw data to search for
the spikes. Any hints?

Second question: on a "full duplex" sound card, can I capture at 8 bit,
mono, 22.050 bit/s , and on the same time playback at 16 bit, stereo,
44.100 ?

Thank you!

Lorenzo
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Received on Thu Nov 6 16:15:01 2008