On Mon, Aug 08, 2011 at 04:54:29PM -0400, Prachi Parihar wrote: > Thanks for your response Marcus. I have been working with this block, but > unfortunately, I do not want to iir filter the power spectrum. I want each > spectrum to be weighed equally. I'd like to compute the arithmetic mean for > all > the power spectra within a minute (I believe there are 4000 per second) so > that > means I want to average 240,000 spectra and return a single power spectrum > (which is the average) to be displayed.
You can calculate this with the spectral estimation toolbox https://www.cgran.org/wiki/SpecEst. Use the 'Welch' estimator. You can configure it to meet your needs easily. Have fun, MB > > As for the "keep one in N" file dump, I considered that when I came across > moving_average_ff but that calculates the average every time it receives a new > spectrum which is very wasteful in my case, since it's computing the average > 240,000 times more than I need to. > > > On Mon, Aug 8, 2011 at 12:45 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > > > On 08/08/2011 12:31 PM, Prachi Parihar wrote: > > Hi everyone, > > > I'm new to gnuradio and I was wondering if someone could point me in > the right direction. I'm using a usrp to read signals in the frequency > domain. I've been able to do this successfully using uhd_fft.py which > uses fft_sink_c() to display the signal. > > > What I want to do instead of displaying the signal continuously is to > display the average of the power spectrum of the signal every minute > using all the samples collected in one minute. I can't find a block > that simply takes the (boxcar) average of many spectra once every > minute. > > > If I can't find a block to do this, I will attempt to write one > myself. > If I need to, is there a strong need to write this block in C++ or > could I write it in python? > > > Thanks in advance for your help, > > Prachi > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > There's a logPowerFFT hier block in GRC that allows you to set the frame > rate and "alpha" value, and it produces a FLOAT vector that's > the length of the FFT. > > You can then further IIR filter those vectors, and then do a "keep one in > N" to make them dump to a file once per minute. > > > > > _______________________________________________ > 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 -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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