your Audio source produces 48000 samples per second, and your USRP needs 1 Million samples per second.
So: from every input sample, you need to make
output samples. You don't do that, but deliver much much less to the USRP, which then tells you that it experienced a sample "U"nderrun.
You will need to add resamplers, or zero-pad your transmission, or use a bursty transmission mode. What you choose here depends on your application, and it's hard to tell you what's optimal.
Best regards,
Marcus
PS: it's always recommendable to "clean up" your screenshots as far as possible, so that no one wonders what parts of it are relevant :)
On 11.04.2016 17:41, Shilei Tian wrote:
Hello, every one.
I want to use gnuradio and usrp n210 with SBX subdev to transmit real-time audio between two PCs. The flow is as follow:
But it couldn't work well, it always outputs "UUUUUUUUUUUUUU…", no matter what samp_rate I set (1M, 48K, etc). I've tried to use Google to search for solutions, but there is no available one, so I ask for help here, I'll appreciate for your help.
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