Re: gEDA-user: Looking for a project

[Greg Cunningham <greg@xxxxxxxxxxxxxxxxxxxx>]

On Tue, 2007-04-03 at 22:49, Dan McMahill wrote:
> al davis wrote:
> 
> > FM stereo generator.  The broadcast ones are very expensive.  
> > You can buy one made for a lab cheap.  It sort of works.  A 
> > real broadcast one is simple but much more expensive.
> 
> If anyone feels like building one of these, I can give some extra 
> guidance on analog implementations and how to test some of the 
> parameters using relatively basic instrumentation.  Personally I think 
> this is a good project for dsp though.
> 
> -Dan

By coincidence, Dan Mills, dmills__a t__exponent.myzen.co.uk, a
developer of rivendell ( http://rivendellaudio.org, a suite of broadcast
automation software) has written a complete software audio/RDS FM
multiplexer called stereocoder & a audio processor/look-ahead limiter
front-end  called louderbox ( borrowed from Jamin - a multiband
compressor/limiter) that all runs on Jack (http://jackaudio.org - a
callback based audio server).  It basically spews 192kHz baseband PCM to
stdout as-is. Just find a audio card that does 192kHz & you're smokin...

his cvs is hosted at Salem Radio Labs (watch the wrap)
cvs -d:pserver:anonymous@xxxxxxxxxxxxxxxxxxxxxxxxxxx:/home/cvs login
cvs -d:pserver:anonymous@xxxxxxxxxxxxxxxxxxxxxxxxxxx:/home/cvs co
louderbox stereocoder
... but as Salem is no longer the primary sponsor of Rivendellaudio,
that may change.  He may also have an alternate cvs.

I asked Dan some time ago if he was interested in shoehorning his coder
into a Blackfin DSP, but he has moved on to other FOSS broadcast
challenges.

If people are interested further, I'm sure he wouldn't mind a chat.
-- 
Greg


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