On 01/13/2014 04:38 PM, Marqo Torres wrote:
Hi, thanks for replying. I'm using 16kHz in Audio sample-rate and
256kHz in USRP sink/source blocks.
Also I've noticed that when I change the config.d values in the files
from the gnuradio folder there's a variation in the breaking up voice
in the receiver's side.
In the transmitter's side I get "UUUUU" constantly and in the
receiver's side i get "UaUaUaUa" I know that it means Underrun and
Audio Underrun, but I still don't have any idea of what I'm doing wrong.
I've attached the flowgraphs of the Tx and Rx models.
Regards
Marqo.
Those UUUUU mean that your graph isn't able to to keep up with the
notional sample-rate, either because of computational sluggishness, or
because you aren't resampling appropriately within your flow-graph so
that the hardware is receiving samples at the correct rate.
2014/1/13 Marcus Leech <[email protected] <mailto:[email protected]>>
Indeed, don't use a throttle block for anything other than a
simulation not involving hardware.
What sample-rate are you using, and are you getting overrun or
underrun indications ('O' or 'U' printed).
on Jan 13, 2014, *Marqo Torres* <[email protected]
<mailto:[email protected]>> wrote:
Hello, I am working on a real time voice Tx/Rx using GNU Radio
as software and a USRP E110. I'm trying to do a QPSK
Modulation and I have consulted several models and forums and
it seems everything is okay, however at the moment of
receiving signal, the audio on the receiver is breaking up,
and I want the audio sounds good. I thought it might be
because of some errors in synchronism and carrier recovery, so
I added the block MPSK Reciever, without any changes in the
audio output. Is anything I am missing? or Is any calculation
or number wrong?
Could it be because of lack in processing? because I've tried
the same model with GMSK mod/demod blocks and the voice sounds
good. I've attached the flowgraphs of the Tx and Rx side for a
better understanding.
I really appreciate your help and I look forward your reply.
Regards.
Marqo
P.S. I've also read that at the moment of involving blocks
that work with hardware (USRP Sink/Source) I have to skip the
Throttle blocks, is that true?
------------------------------------------------------------------------
_______________________________________________
Discuss-gnuradio mailing list
[email protected] <mailto:[email protected]>
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
_______________________________________________
Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
