Re: [Discuss-gnuradio] Give sample rate to throttle block dynamically

[Martin Braun (CEL)]

On Wed, Nov 13, 2013 at 07:42:35AM -0800, Jenny Galasso wrote:
> I am parsing the sample rate from a file name and would like to dynamically
> pass that to a downstream block (for instance the throttle block).  I tried
> using a function proble to get the sample rate value and having the throttle
> get the sample rate from it.  It seems like the throttle is only getting the
> initial value from the function probe though and not updating.  Please let me
> know if I'm on the right track, or if there is a better way to pass the sample
> rate to other blocks.

Hi Jenny,

the throttle block is really only used to run offline flowgraphs and make sure
they don't swamp the CPU. Do you have any other clocks in your
flowgraph, or is this the only one?

If you're reading the sample rate from a file name, my suggestion is to
figure that out before you start the FG, and set it while initializing.

If you want to change sampling rates dynamically, this calls for stream
tags. However, there's no block in stock GNU Radio that reads sampling
rates from stream tags.

MB

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

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KIT -- University of the State of Baden-Württemberg and
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