6 Nov
2008
6 Nov
'08
6:51 a.m.
OrazioPirataDelloSpazio (Lorenzo) wrote:
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?
There are a couple of gates in the ladspa/swh/etc... kits. This is
generally what they are used for.
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 ?
It depends on the cards capabilities. Some consumer cards can only
manage playback at 48000hz.
You can find out with
cat /proc/asound/card0/codec
look for the AudioOutput and AudioInput to see what the card can do.
There may be more details in other nodes depending on your card.
Thank you!
Lorenzo
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Patrick Shirkey
Boost Hardware Ltd.