[Linux-ham] automated Audio processing in Linux?

Jeremy Portzer jeremyp at pobox.com
Mon Mar 22 12:09:53 EST 2004

Good afternoon folks,

I'm looking for some sort of software that will do automatic/batch audio
processing.  Here's what I'm looking to do:  connected to the input of a
sound card is a scanner radio which is listening to certain
frequencies.  Radio traffic is erratic, so most of the time there is no
input (or a very low level of white noise perhaps).

What I'd like to do is run something that would monitor the input ...
when there is traffic, record that into a file, and then stop recording
when the transmission stops.  This needs to be totally automatic; the
files would then be compressed and put on a web site (I can do that part
easily enough with shell scripts).  I also would like to be able to
stream the same incoming audio to icecast at the same time, for
real-time listening.

What kind of software is out there for batch audio processing in Linux?
Can some of the tools that are part of IRLP be of relevance to me?

Thanks for any advice.  My experience with Linux and multimedia stuff is
a bit limited, so I hope I can get this working!  I'm planning on using
Alsa (either with 2.4 or 2.6) but could change that if necessary.

| Jeremy Portzer        jeremyp at pobox.com      trilug.org/~jeremy     |
| GPG Fingerprint: 712D 77C7 AB2D 2130 989F  E135 6F9F F7BC CC1A 7B92 |
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