[Gloucs] DSP on Linux.

[Lyndon Evans]

Check out GNURadio and the GRC (GNU Radio Companion). 
Installation is a bit long winded, but straight forward on Ubuntu (or Fedora),
plus a live connection to download required packages.

The GRC is a GUI based drag'n'drop DSP module connection kit (a bit
like Mathworks Simulink, only its all open source). Essentially, all you'd
need to do is select the audio source, a filter block, down sampler block, 
then an audio sink (I presume), run it and get excited! Various FFT/scope
sinks are available to test your design.Once your design is working, all
you need is the connection config script to run outside the GUI.

Theres all sorts of modules, (de)modulators, decoders, etc. Signal sources
and sinks can be sound card, soft waveform generators and the USRP.
Check this out too for an inexpensive (comparatively for what it offers)
open source (!!!) transceiver hardware platform.


See www.gnuradio.org for GNURadio/GRC/USRP. Its available for
Darwin too.

Lyndon



________________________________
From: Geoff Bagley <geoff.bagley at btinternet.com>
To: Gloucestershire LUG <gloucs at mailman.lug.org.uk>
Sent: Sun, 17 January, 2010 18:05:47
Subject: [Gloucs] DSP on Linux.

I have an interest in processing a weak  narrow band  modulated audio 
signal on about  2.25 kHz (tuneable upwards).
The over-all modulation bandwidth may be no more than 10 Hz,  but this 
is not yet proven.

I would prefer to process the signal digitally.  I have a couple of 
Motorola DSP56002   kits,  but
feel that the ubiquitous  PC sound card might be preferable  since the 
only support software appears
to be based on Micro$oft.

Selection and filtering of the signal may be followed by down-sampling 
and analysis at baseband.

Please does/do  any of you have experience in this field ?  My system is 
Debian Lenny.
I would be pleased to chat with anyone intrigued by this project

Happy New Year.

Geoff

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