Re: [Discuss-gnuradio] PSK Real Time Voice Tx/Rx
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 marqotor...@gmail.com 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?
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Re: [Discuss-gnuradio] PSK Real Time Voice Tx/Rx
On 01/13/2014 03:31 PM, Marqo Torres 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. Do you see any O/U's from the flowgraphs? If so which flowgraph? Philip 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 Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] PSK Real Time Voice Tx/Rx
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 U 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 U 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 mle...@ripnet.com mailto:mle...@ripnet.com
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* marqotor...@gmail.com
mailto:marqotor...@gmail.com 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?
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Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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