Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP

[Marcus Müller]

Hi,
your warning points to the UDP source: Since your receiver can't process 
all the samples that it gets
via UDP, and the UDP source runs out of buffering capacity, it starts to 
drop UDP packets.

There are two things that you must do:
1) The Samples for the audio sink _must_ be resampled to the right sound 
card sampling rate,
e.g. 44.1kHz, otherwise that card will see a highly frequency-shifted 
version of the real signal
2) take care that the samples from the network get processed fast enough 
so that there will be no dropping.

Best Regards
Marcus

Am 08.08.2013 18:09, schrieb Iain Young, G7III:
> Different parts of the flow graph can have different sample rates.
>
> You need to use the rational resampler so it's output matches what
> your soundcard expects.
>
> You may also need a complex to real somewhere. There are plenty of
> examples for a FM receiver on the web.
>
>
> Best Regards
>
> Iain
>
> On 08/08/13 16:56, Vanush Vaswani wrote:
> > How can I set the sampling rate on both ends to be the same? FCDPP
> > sampling rate is 192 KHz.
> >
> > If I include an audio sink, is the rate of the flowgraph controlled by
> > the sound card sampling rate?
> >
> > Attached are my .grc files.
> >
> >
> > On Thu, Aug 8, 2013 at 11:34 PM, Alexey Bazhin <address@hidden
> > <mailto:address@hidden>> wrote:
> >
> >     Do you set sampling rate 192000 on both ends? Post your grc files.
> >
> >     On Thu, 8 Aug 2013 14:09:42 +1000
> >     Vanush Vaswani <address@hidden <mailto:address@hidden>> wrote:
> >
> >      > Hi there,
> >      >
> >      > I'm trying to stream the FCDPP over UDP to a another computer
> >      > The setup is as follows
> >      >
> >      > FCDPP Source -> UDP Sink
> >      >
> >      > For the receiver,
> >      >
> >      > UDP Source -> LPF -> Quadrature demod -> FM Deemph -> LPF -> 
> > Audio
> >      > sink
> >      >
> >      > Unfortunately, when I run the flowgraph on the receiver end, I 
> > only
> >      > hear a bunch of clicks.
> >      > The console is full of messages "WARN: Too much data; dropping
> >      > packet.". WX GUI FFT Sink and Waterfall seem to work, though 
> > with the
> >      > same messages.
> >      >
> >      > Any hints to rectify this issue?
> >
> >
> >     --
> >     Alexey Bazhin <address@hidden <mailto:address@hidden>>
> >
> >
> >
> >
> > _______________________________________________
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> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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