Marcus, Every sample rate I try produces the UaUaUa pattern. I tried all the built in rates as well as 192 kHz.
When I run the gr-aduio dial-tone example, I get garbled noise as output, instead of a dial tone, with the noise source turned off. Do you have an idea what this might point to? Pandora produces perfectly normal music coming out of my speakers as a sanity check. v/r, Rich On Wed, Mar 25, 2015 at 10:59 AM, Marcus Müller <marcus.muel...@ettus.com> wrote: > Hi Richard, > > these are audio Underruns, meaning that you did not supply the sound > system with the samples it needs for continuous playback in time. > following an old FAQ entry [1]: > If you have RF hardware in your flow graph, you might be seeing the > "two-clock problem": No two oscillators are exactly the same, so if your > sample-producing hardware is a bit slower than it should be, or your sound > card is a bit faster, than you'll see this. > > Also possible is that you've used a sampling rate that your audio system > doesn't actually support, and it automatically used a different one, so > that you end up with the same problem as above, even when things *should* > work (if the audio device actually consumed samples at the rate you > specified). Try 44100 or 48000 Hz, these work on most sound cards. > > Another reason is that your system is simply too slow at calculating > samples, but that's unlikely on modern hardware, unless you do something > very CPU-intense (e.g. a 400 tap filter, or something). > > And yet another warning: Never ever use throttle in a flow graph with > hardware. It gives you the two-clock problem (one clock being sleep() of > your OS), AND it just "stops" samples in large chunks until enough time has > passed that a large-scale average sample processing rate is met. On smaller > scale, though, this leads to frequent underruns. > > Greetings, > Marcus > > [1] > http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#I-have-a-receiver-with-acoustic-output-and-keep-getting-aUaUaU-errors > > > On 03/25/2015 06:42 PM, Richard Bell wrote: > > Hello, > > When I have an audio sink in my flowgraph, leaving the device field blank > to default to speakers, I see a continuous stream of UaUaUaUa printed to > the console. What is this telling me? Disabling the audio sink stops the Ua > stream. > > v/r, > Rich > > > _______________________________________________ > Discuss-gnuradio mailing > listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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