Missing internal callbacks

GNU Radio
1

Hello-

when creating a flowgraph in GRC there are times I would like to change
the decimation on-the-fly with a gui slider. However, this does not
work because the decimation factor in blocks such as the AM Demod or
Decimating Fir Filter does not have an internal callback (as I
understand it). My main purpose is to be able to dynamically change the
sampling rate to re-scale the x-axis in a gui fft sink while the
flowgraph is operating. Is there a way around this? Is this a
necessary limitation, or just something nobody has gotten around to
implementing?

Thanks!

Eric

2

On Fri, Jul 4, 2014 at 5:40 AM, [email protected] wrote:

It is not impossible to have a block that its decimation factor or/and
sampling rate could be changed on the fly.
Create your own block, inherited from general block.
But it is tricky to code it correctly, need a lot of skill and testings.

3

It is a very difficult thing to implement practically and is so close to
necessary limitation that you should just consider it necessary and move
on.

Bob