On Thu, Feb 5, 2015 at 11:30 AM, Jorge Gallo <jmig...@gmail.com> wrote:
> Hi, > > I have a python flowgraph with several blocks. > > One of them is a "filter.single_pole_iir_filter_ff" which does a moving > average. The last block is a Sink to file block. > > I scan several bands, 10MHz each, in order to get the power of the signals > in those bands. I use moving average to get an average of 5 readings in > each band. > > In order to change the center frequency, I stop the flow-grahp, > reconfigure the USRP center freq and then start the flow-graph again. > You can use the message port[1] in uhd source/sink or stream tags [2] to change the center frequency > > I guess samples from the previous scans remain in internal block buffers > since I get power in samples of BAND2 (BAND1+10MHz) which are only present > in BAND1. That is, the moving average is effective between bands and I only > want to be effective in the same band. > > I thought that stop() and start() signals would reset the entire graph but > I am afraid it doesn't. > > Is there a way to flush those samples so that everytime I run the > frequency changed flow-graph I don't get the samples from the previous band? > UHD source will give rx_time, rx_rate and rx_freq tags whenever there is a tune request to a new frequency. You can use these tags to get rid of unwanted samples. > > Many thanks in advance. > Jorge > [1] http://gnuradio.org/doc/doxygen/page_uhd.html [2] https://github.com/gnuradio/gnuradio/blob/master/gr-uhd/examples/python/freq_hopping.py > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- Regards Sreeraj Rajendran http://radioninja.in/
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