On 02/26/2014 01:31 AM, Michael Berman wrote: > I am seeing some odd behavior with an OOT decimation block. What I am > seeing is chunks of data are being dropped down to noise for random > calls of the work function in my OOT. To observe this happening, I > tee'd off the connection going into my OOT module and went strait into a > file sink and then from within the OOT module for each call of the work > function I stored off the incoming data to a file; the results of a good > and bad frame of data are provided in the below links. Within this > data, the top chart is the file sink tee'd off and you can see it > tracking well for the most part with the data from within the module on > the bottom. Within the "bad frame" image however, a little over 1000 > samples in, the data drops down noise around 0 instead of being a nice > (and slightly noisy...) sinusoid. The OOT module has a decimation value > of 4000 in this particular case. I am running on Fedora 20 with a week > old pull of GNURadio master branch. > > Does anybody have any thoughts as to why this is happening, and what I > could do to resolve it?
Agreed this is weird. No immediate solution pops to my mind, but can you provide some more info: - Is this block part of a larger flow graph, or does this occur also when you isolate your block? - Is this code you can share? If so, can we see the OOT > The first resolution that is coming to mind would be to re-write my OOT > module to run with general_work, and manage the input buffer myself. > Does anybody see any issues with doing this as a work around/solution? There's no reason not to do that, but it would be a big surprise if that helped. After all, a sync_decimator is just a very thin wrapper around a gr::block. > good frame: https://www.dropbox.com/s/tma3qn5byismgha/good_frame.png > bad frame: https://www.dropbox.com/s/xgvcmlbgma14k0i/bad_frame.jpg > > > Thank you all in advance for the help, > > Michael Berman > > > > _______________________________________________ > 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
