Re: [Discuss-gnuradio] Change filter parameters in running flowgraph?

[mleech]

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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