Re: [Discuss-gnuradio] PALM / NTCS Audio demodulation

[Eric Blossom]

On Mon, Jul 10, 2006 at 03:42:12PM -0300, Augusto Pedroza wrote:
> I've built an application that intends to output both signals video and
> audio, but I haven't been able to test it because it requires a lot of
> computer power.
> i just added these lines:
> >>self.u = usrp.source_c(decim_rate=options.decim,fpga_filename=
> self.fpga_filename)
>    self.u_audio = copy.copy(self.u) -- Creates a copy just so I can set a
> different frequency for  the audio sink
> 
> the audio frequency gets the input frequency and adds 5.75M
> and the video frequency adds 1.25 to the input.
> PS. The input frequency should be the lowest frequency of the VSB
> for example if VSB = 210 - 216, the input should be 210M
> 

I'm not sure what you're trying to accomplish with copy.copy.
My suggestion is that you suck down the entire Video + Audio in one
stream from the USRP, and then split off the audio using an instance of
gr.freq_xlating_filter_ccf.

Eric