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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] accumulate spectrum |
Date: | Mon, 30 May 2016 22:37:12 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 05/30/2016 09:19 PM, madengr wrote:
Files don't have any inherent sample-rate. Regardless of what rate they were recorded at. Gnu Radio has no real "sense" of sample rate, and will process samples as fast as it can. The only place where sample rate is "real" with respect to actual real-time is at the "edges" when the "edges" are controlled by actual hardware with an actual real-time-relative sample-rate.Try this: https://www.dropbox.com/s/7xsg4arx5h3gvah/spectrum.grc?dl=0 The integrate with decimation is what you want. Starting at 32 ksps with a 1024 length FFT length yields 31.25 vector/sec. Then an integrate with decimation by 32 averages down to 0.98 vector/sec. However when I try reading those back from the file, I'm not getting the 1 ksps I should be getting. I have to set that throttle at 8000 to get the proper update rate. Lou
If you read data from a file, Gnu Radio will vacuum it out just as fast as it can.
Adellain TSIAHINA wroteDear All, I'm new to Gnu Radio. I looked carefully to the doc and tutorials but could not find any simple answer to my problem. I have a radio signal from which I'm able to visualize the FFT in GNU Radio Companion. Now I would like to save the FFT (more exactly the magnitude squared, or the spectrum) accumulated over a given period of time (the average over time) into a file. I found the following blocks in GRC that seem to be helpful: - stream to vector - FFT - complex to mag - file sink However I did not manage to save any accumulated spectrum... Any help (eg a woking example) would be very welcome! Thanks in advance. Adellain _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@ https://lists.gnu.org/mailman/listinfo/discuss-gnuradio-- View this message in context: http://gnuradio.4.n7.nabble.com/accumulate-spectrum-tp60256p60265.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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