Re: [Discuss-gnuradio] audio underrun when bad signal quality

[Markus Heller]

Hi Marcus,

ok, here is the sketch:
http://www.dl8rds.de/index.php/Datei:2015-09-18-gnuradio_rtlsdr1.png

There is no squelch in the data path. But thanks a lot for explaining
the effects of a squelch. 

Maybe there is another reason for my observation, because I unplugged my
antenna from the rtlsdr stick for a while and there were no audio
underruns today. 

Let me observe some more time and I will come back on this if I have new
insights. 

best73
markus

Am Dienstag, den 22.09.2015, 21:28 +0200 schrieb Markus Heller:
> Hi Marcus,
> 
> I have been reading from you more frequently on this list than you've
> been reading from me :-)
> 
> I have my setup in my office computer, so I will send the setup to this
> list tomorrow.
> 
> Thanks ahead!
> 
> vy73
> markus
> dl8rds
> 
> Am Dienstag, den 22.09.2015, 19:56 +0200 schrieb Marcus Müller:
> > Hi Markus,
> > 
> > nice to be hearing from you!
> > 
> > I'm making assumptions about your RX flow graph here:
> > 
> > osmocom source --> squelch of some sort --> FM demod/ AM demod of sorts
> > --> Audio sink
> > 
> > If the squelch is set to stop the flow of samples as long as there's not
> > enough signal, then downstream, the audio sink doesn't get any samples,
> > though it always needs the same amount of samples per second. Hence,
> > Underflows.
> > 
> > Hopefully, that explains the issues you're having; if not, please
> > explain your receiver in a little more detail,
> > 
> > Best regards,
> > Marcus
> > 
> > On 22.09.2015 18:34, Markus Heller wrote:
> > > Hi,
> > >
> > > playing around with my RTLSDR stick (RTL2832U / Rafael Micro R820T
> > > tuner) I observed that whenever the reception (signal quality) is bad, I
> > > am getting Audio Underruns and glitches in the accoustics. 
> > >
> > > How can that happen? I always thought the sample rate was constant? When
> > > designing the sketch I took good care that the sample rates were fine.
> > > Whenever I get good signal quality I have no underruns at all. 
> > >
> > > Thanks in advance,
> > >
> > > br
> > > markus
> > >
> > >
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> > 
> > 
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