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[Discuss-gnuradio] Audio Source configuration

From: Larry Van Der Jagt
Subject: [Discuss-gnuradio] Audio Source configuration
Date: Tue, 17 Mar 2015 10:30:33 -0400


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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