Also make sure that the ALC662 also supports the audio sampling rate you're using -- 44100 is the only rate I've been able to use on any platform [1].
Best regards, Marcus [1] http://gnuradio.org/redmine/projects/gnuradio/wiki/ALSAPulseAudio On 28.08.2015 12:31, Jeff Long wrote: > Make sure you're using 'plughw:' for the audio device so the driver > does resampling (check ALSA docs). Without looking at the flowgraph, > I'd guess this is a clock domain problem and your new computer (and > audio card) clocks are somehow different than your old ones. > > On 08/28/2015 04:40 AM, Murray Thomson wrote: >> Hi, >> >> I have a flow graph that receives, demodulates and filters a signal >> before sending it to the audio card. It's been working in a single >> board, single core, computer with an audio card ALC888 for months. I >> occasionally had underrun messages, specially when changing filter >> parameters. This messages were normally less than 10 and very spread, >> about every 30 seconds. It didn't cause any noticeable noise or >> problems. >> >> Recently I moved to a better computer with better CPU, 4 cores and a >> ALC662 audio card. The Python script works fine, with no visible >> bottlenecks in the processor. However, I now get constant overruns and >> underruns reported, making the audio noisy. >> The audio card is able to work correctly when using the speaker-test >> command so, there isn't a fault in the hardware. It's also capable of >> running at the required sample rate. >> >> Is there any test I could make to understand and fix this issue? Has >> anyone had a bad experience using this audio card with GnuRadio? >> >> Thanks, >> Murray >> >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
