Hi, If i add a rational resampler to match the audio rate before the UDP sink, I can get a continuous output, but it's of terrible quality due to the loss of information.
How does the flowgraph work having a sample rate 'mismatch' when the FCDPP block is in the same graph?! Could you give me a hint in working around this issue? Sent from my iPhone On 09/08/2013, at 5:01 AM, Marcus Müller <mar...@hostalia.de> wrote: > Hi Vanush, > > as Iain pointed out, the sound card _enforces_ a low sample rate by being an > actual piece of hardware; > therefore, 44.1ksamples/s "leave" your flowgraph at the audio sink, while you > feed it 192ksamples/s from the > funcube. > A faster computer _might_ help, but first adjust the sampling rates (although > if your computer is really fast travelling away from you, the 192ks/s might > hit him with 44.1ks/s, but I guess if you get a computer that fast, it might > be the end of everything.) > > 08.08.2013 20:18 Vanush Vaswani: >> Ok, >> >> would a faster computer help? I am running the receiver on a 2008 Macbook >> air, might be a bit slow for modern standards. >> >> On Fri, Aug 9, 2013 at 4:13 AM, Marcus Müller <mar...@hostalia.de> wrote: >>> 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 <b...@irc.msk.ru >>>>> <mailto:b...@irc.msk.ru>> 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 <van...@gmail.com <mailto:van...@gmail.com>> 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 <b...@irc.msk.ru <mailto:b...@irc.msk.ru>> >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 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 >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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