Re: [Discuss-gnuradio] More Questions

[Matt Ettus]

Carlson, Douglas wrote:

> I am relatively new to gnuradio – I’ve been trying to get everything 
> up an running – after long vacation – I’m back at it. I’m struggling 
> with the “sound” part of it.
>
> I’m running FC5 on a compact computer with an nvidia sound card. I am 
> following the instructions given in wiki for FC5 build (did most 
> recent last night)
>
> gr-audio-oss seemed to configure and build along with most everything 
> else. When I run dial_tone.py – I get a dial tone out of speakers –
>
> When I run, usrp_wfm_rcv.py, with –f 107.9M (Boston area FM station) – 
> I get indication of signal – demodulation seems to function – but 
> nothing out of speakers – not even white noise. Seems like an issue 
> with the audio sink or something. Any idea where I should be looking 
> for the problem?
gr-audio-alsa is the preferred sound driver.

If audio works in dial_tone.py then it should work in the other app 
unless your soundcard doesn't support the sample rate it uses (32K). Try 
using the following option on the command line:

-O plughw:0.0

This enables the alsa audio rate resampler.

Matt