For the most part, decimation cannot be changed at runtime, due to the
way the scheduler does static allocation and buffer management.
On 2017-11-02 13:05, John Ackermann N8UR wrote:
I'm getting ready to do a Gnuradio tutorial for a local group, and
want to show the impact of decimation and filtering. I created a QT
Gui Range parameter that sets the ID "decimation".
In the low pass filter block I the decimation value is set to
"decimation." That seems to work and I can see the span of the QT
Frequency Sink change as the decimation value changes.
But I also use the decimation parameter to determine the cutoff
frequency ((samp_rate/decimation)/2) and transition width
((samp_rate/decimation)/10). However, these don't seem to change
dynamically when the flowgraph is running-- the filter remains at the
width it was when the flowgraph started.
Is there a way to have the filter change as the decimation parameter
changes?
Thanks,
John
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