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Re: [Discuss-gnuradio] [USRP-users] Audio Source configuration

From: mleech
Subject: Re: [Discuss-gnuradio] [USRP-users] Audio Source configuration
Date: Tue, 17 Mar 2015 10:48:20 -0400
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If you're getting long strings of 'U', this means a *gross* sample-rate mis-match somewhere in your flow-graph,
 rather than the more-subtle "two clock" problem.

Make sure that everything agrees internal to the graph about sample-rates, and, perhaps more importantly, that your audio *hardware* is capable of delivering the desired rates.



On 2015-03-17 10:30, Larry Van Der Jagt via USRP-users wrote:

Can anyone point me to some "color" on how to work with the Audio Source.  I am working examples to transmit FM Audio and have problems with Underruns on the UHD:USRP Sink.
The examples (from files.ettus.com/tutorials/Lab_5.grc and others) I am running select Audio Source Arch:alsa and this seems to be a problem.
I have tried to replace the Device name with plughw:0,0 as suggested in the documetnation, but this does not seem to have an impact on the choice of Audio arch: alsa
If I replace the audio source with a signal source at the same sample rate all is well, but the Audio Source implements UUUUUUUUUUUU.
Using the suggestion of having the USRP expect a bit lower rate than the audio can deliver seems to implement nearly limitless delay .... the voice is received but only after a very long ... many seconds delay ... ....
At this time I am using a B210 connected via USB3 to an I7 with plenty of memory running Ubuntu 12.04 ....  I have similar issues trying to use an E310 as the transmitter ...
Any direction would be appreciated.

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