Ok, I still don't understand why I'm getting so many dropped packets. sender FCDPP -> UDP Sink
receiver UDP Src -> _Throttle_ (at 192KHz) -> WBFM Receive -> Wav File Sink Note: no audio sinks. I constantly get "WARN: Too much data; dropping packet." Wave file is full of skips, yet both flowgraphs are running at the same rate? On Fri, Aug 9, 2013 at 10:37 AM, Iain Young, G7III <g7...@g7iii.net> wrote: > On 09/08/13 00:22, Vanush Vaswani wrote: > >> 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. >> > > You are always going to have to throw information away. You have 192k > that you are trying to fit into human hearing, so you *must* filter > and then down sample. > > How wide is your BPF/LPF ? Is it more than your soundcard can handle ? > > > How does the flowgraph work having a sample rate 'mismatch' when the >> FCDPP block is in the same graph?! >> > > Your soundcard (probably) expects 44k1. The resampler takes care of > this, but of course, 192k is not going to go into 44k1. You need to > filter first. > > > Could you give me a hint in working around this issue? >> > > As I said before, google has plenty of examples of FM receivers with grc > (Google for gnuradio FM receiver grc, I'm sure you'll find loads) > > Here are two working flowgraphs that start at 192k and 250k > respectively: > > http://hal.g7iii.net/GRC/**Examples/Simple_Multimode_RX.**png<http://hal.g7iii.net/GRC/Examples/Simple_Multimode_RX.png> > http://hal.g7iii.net/GRC/**Examples/GUI_TRX_JACK.png<http://hal.g7iii.net/GRC/Examples/GUI_TRX_JACK.png> > > They are actually a multimode receiver I wrote as an example for a > friend, and a multimode transceiver for ham radio use, but they show > the FM receive chain. > > With both, you'll note I have a variable BPF so I can listen to > broadcast stations on MW/LW, and FM, SSB, or CW stations on the amateur > radio bands. > > For pure FM you can drop the selector blocks, and just concentrate on > the NBFM receiver chain > > Note if you need to be tuning with the FIR filter, you'll need to define > filter taps. I used a simple LPF. > > > Hope that helps > > Iain >
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