Re: [Discuss-gnuradio] GRC, Recording chunks of spectrum triggered on input signal level

[madengr]

See my note about dynamic recording of file names:
http://rfpoweramp.wordpress.com/category/sdr/gnu-radio/

The file sink is either being directed to "filename" or "/dev/null".  You
can dynamically change that during the flow with a boolean check box.  In
your case, instead of the check box, you would setup a probe to monitor your
integer, and maybe probe at 10 times a second, which would change the file
name.

The actual "filename" is a python statement that concatenates the system
time and other info into a formatted string.

I'll post an example GRC file tonight that shows the dynamic recording with
time stamped file.  I'm going to try the ARRL Frequency Measurement test
tonight, and wrote a GRC flow with that functionality (not the probe part,
but I'm using probes to display the channel power).

Lou
KD4HSO
   


Staffan Bruce wrote
> Hello,
> 
> Being limited in my programming skills, I would very much like to do the
> following in Gnuradio Companion:
> 
> * Sample an input stream (from RTL-SDR)
> * Generate a trigger signal based on the input stream
> * If a trigger criterion is met, save/sink the data stream for a preset
> time and give the file a name based on time of acquisition (or similar)
> * Reset the flow and start all over.
> 
> Getting the input stream is no problem and I believe I know how to
> generate the trigger signal, but starting a sink (with a new filename) for
> a preset time (number of samples is fine) based on this signal seems
> tricker (not to mention the file naming part).
> 
> If anyone can provide suggestions for how to 
> * start a new sink (new file) based on an integer signal shifting from 0
> to 1
> * automatically name each file sequence, sequential numbering is OK
> 
> this would be very much appreciated!
> 
> Many thanks in advance!
> 
> Regards,
>   Staffan
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> Discuss-gnuradio@

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