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Re: [Discuss-gnuradio] Stupid Soundcard Sample Tricks
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Stupid Soundcard Sample Tricks |
Date: |
Mon, 13 Jun 2005 11:16:50 -0700 |
User-agent: |
Mutt/1.5.6i |
On Sun, Jun 12, 2005 at 04:30:52PM -0400, John Ackermann N8UR wrote:
> Hi --
>
> After successfully getting gnuradio and the USRP to run on my laptop
> (Thinkpad R40), I decided it was time to install it on my main hamshack
> computer. Using the lessons I learned the first time, the code built
> just fine and I can talk to the USRP.
>
> However, I'm having trouble getting audio out of the box. The on-board
> AC97 soundcard seems frozen at 48ksamples/second, and the example
> programs I've tried print something like:
>
> audio_alsa_sink[hw:0,0]: unable to support sampling rate 32000
> card requested 48000 instead.
>
> and I get extremely distorted audio and lots of underruns printing to
> the console.
>
> Any suggestions how to resolve this problem? I messed with the various
> decimation params in the example tvrx_wfm program, but managed only to
> prove how little I know what's going on inside the system.
>
> Thanks,
>
> John
Hi John,
Some sound cards will only run at 48,000 S/sec.
Try using plughw:0,0 as the pcm device (second arg to
audio.source/sink). It will insert an automatic sample rate
converter.
Eric