Re: [Discuss-gnuradio] accumulate spectrum

[madengr]

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



Adellain TSIAHINA wrote
> Dear 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
> 
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