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Re: [Discuss-gnuradio] tx_voice.py

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] tx_voice.py
Date: Thu, 10 Mar 2016 23:44:58 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0

Hi Ekko,

U means underflow.
You're computer is too slow at supplying samples. This means that your computation might be to complicated.
More likely, however, is that you configured your sound card to a sample rate it doesn't support, so it uses a different one, and hence, the whole flow graph's rate relations break down.
Are you internally resampling from your 8 kHz audio sampling rate to a factor of your GMSK symbol rate?
Really look into tx_voice.py, and understand what each part does.

Best regards,

On 10.03.2016 14:49, Ekko wrote:
hello all
i am using tx_voice.py to transmite voice
the audio samp rate = 8K gmsk mod samp rate =50K usrp_sink samp rate =100K

but i got 

... *why* is every of your screenshot scaled down so much that one cannot read it?
Please, if you've got a text console, just copy & paste the text. The screenshot really doesn't convey any additional information.

i want to ask waht this U mean ,and how can i solve this.


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