On 05/30/2016 09:19 PM, madengr wrote:
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
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.
If you read data from a file, Gnu Radio will vacuum it out just as fast
as it can.
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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