Hi Matt, Perhaps I'm missing something very basic, but I fail to see how you reached the numbers for the sample rates. They look wrong to me. 1 Msps -> decimation by 4 -> 960 Ksps?
Regarding performance, I'd say some optimization is required for better performance. I was able to demodulate WFM with gnuradio on a 1.2 GHz ARM mobile phone with plenty of CPU to spare (50% or more). I can give you a flowgraph if you want, but it's C++ code not GRC. Regards, Adrian On 3/6/18, matthew venn <[email protected]> wrote: > Hi Brian and Adrian, thanks for the help. > > we've finally gotten around to having another go with gnuradio. > Brian, I tried your settings and we have the same situation. Things work > fine until we adjust the tuning, then something happens. There is still > some crackling from the speakers, but > we can never get the sound back, even if we retune to exactly where we > started. > > Attached is the new patch, and the errors that get printed when we tune. > One thing that has changed is there is no aU errors anymore. > > > > Regarding hardware, it's the LimeSDR. My PC is 6 core 3ghz FX6100 with 8gb > ram. It hits 50% on one core with gnuradio companion running. When tuning I > don't notice a difference. > Thanks! > Matt > > > On 16 February 2018 at 22:42, Adrian Musceac <[email protected]> wrote: > >> Hi, >> Based on your graph, the filter seems to be running at the same sample >> rate as the source, even though you have a decimator block ahead of it. >> I suggest to correct that and then try again. >> >> Cheers, >> Adrian >> >> On February 16, 2018 8:42:13 PM UTC, matthew venn <[email protected]> >> wrote: >>> >>> Hi all, >>> I've got a limesdr that I'm using to learn about SDR. I started with the >>> AM tutorial from the website and have now moved on to something that I >>> can >>> pickup with an antenna. >>> >>> The flow works, until I tune it. Then I get aU on the log, and the audio >>> changes (it still makes noise), but I can never get the audio back even >>> if >>> I retune to exactly where it was. >>> >>> I can use the waterfall to find a new frequency, then stop the flow, >>> type >>> that new number as the default tuning and then start and hear audio >>> again. >>> Until I tune... >>> >>> Any idea why it breaks the audio when I tune it? >>> >>> Thanks, >>> Matt >>> >> > > > -- > Matthew Venn > web mattvenn.net twitter @matthewvenn <https://twitter.com/matthewvenn> > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
