Re: [Discuss-gnuradio] Success (kinda)

[Alan Gray]

Ok, for a bit of closure on this I did eventually manage to get a 
reasonable audio signal out of the FM demodulator, however it only lasts 
about 2 minutes before the program crashes.

As I suspected the major problem is the libraries provided by Adlink for 
the PCI-9812 card that I'm using in place of the PCI-DAS4020. They are far 
too inefficient for this sort of application (just running a simple double 
buffered acquisition chews an entire Athlon 2400+ processor). We're now 
tossing up either writing a new driver for the card or ditching it totally 
and trying to integrate an ICS-645 card that we also have kicking around.

Unfortunately there is not much in the way of information on low-level 
control of the PCI-9812 so it might be back to the drawing board for a while.

Alan

At 11:11 AM 26/09/03 -0700, Eric Blossom wrote:

> On Fri, Sep 26, 2003 at 06:26:11PM +1000, Alan Gray wrote:
> > I have had a bit of success on the non-real-time front though, I've still
> > only got one disk at the moment, but with DMA enabled it gives me about
> > 33MB/s sustained transfer, which is enough to snag about 5 seconds of data
> > which I can then process successfully to get a good quality audio stream.
>
> Excellent!
>
> > When I have the chance, I'll draw up a decent schematic of the circuit 
> I've
> > used for the 4702 tuner (it's much the same as the 4937 circuit, with a 
> few
> > mods) and clean up the code a little to add to the archives
>
> Looking forward to it.
>
> Eric