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

[Marcus Müller]

Hi Staffan,

I think that you'll find the things you describe can be best noted more or less algorithmically (which you have already done!); and thus, I'd think it's easier to actually write that specific sink you need than to do what you want to do in GRC (I must admit I can't think of a way of doing that in GRC... it's just so un-graphically-clickable ;) ).

Now, this might sound like bad news to you, but I assure you that writing a python block is not as hard as it might sound to you; just follow the first few of our new guided tutorials [1] and you might write your own sink that writes each chunk of samples -- as your detector tagged it -- to a new file.

Greetings, and happy hacking,
Marcus

[1]http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials

On 11/12/2014 08:54 PM, 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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