[linux-audio-dev] Radio Scanner Recorder

Eric Dantan Rzewnicki rzewnickie at rfa.org
Tue Aug 30 17:17:12 UTC 2005

On Tue, Aug 30, 2005 at 11:31:50AM -0400, Guillaume Filion wrote:
> Guillaume Filion a écrit :
> >>I'm a in the process of making a police/EMS/fire radio recorder. ...
> >>However, I started thinking and found that it would be better to have a 
> >>different file for each segment. For example, if there is
> >>- 45 seconds of speech, followed by
> >>- 3 minutes of silence,  followed by
> >>- 2 minutes of speech
> >>I would get two files, one 45 seconds long and one 2 minutes long.
> >>Does such a program allready exists, and if not, what would be the 
> >>best/easiest way of doing it?
> Hi and thanks for your responses,
> I started playing with batchrec last night with good results. The source 
> code is clean and compiled on the first try (on debian).
> I tried it on an old 200 MHz PC with 32 MB ram. I made a small perl 
> script that runs every 5 minutes from a cron job. The script runs at low 
> priority (with nice) and does some post processing on the wav files and 
> recompresses them to 16 KHz 24 Kbps Mono MP3 files.
> From time to time, I get a "Input/Output Error" from batchrec, I guess 
> this is because of the low system ressources. It might be a good idea to 
> do the post processing on another PC.
> I'm not really familiar with jack, I took a look at the documentation 
> but I would have to invest more time to get something out of it. For 
> now, batchrec does the job pretty well. One thing that I would like to 
> do would be to use a low pass filter because my scanner seems to emit 
> some low frequency sounds that are louder than some parts of the 
> conversations. If I understand jack correctly, it would allow me to plug 
> a low pass filter in front of the recording program easily.

You mean a high pass filter, right?

Eric Dantan Rzewnicki  |  Systems Administrator
Technical Operations Division  |  Radio Free Asia
2025 M Street, NW  |  Washington, DC 20036  |  202-530-4900
This e-mail message is intended only for the use of the addressee and
may contain information that is privileged and confidential. Any 
unauthorized dissemination, distribution, or copying is strictly 
prohibited. If you receive this transmission in error, please contact
network at rfa.org.

More information about the Linux-audio-dev mailing list