Re: Is there a way to change the number of taps of the FIR filter in GNURadio while running?

[Nick Foster]

It looks like the GRC convenience blocks for the filter tap generation don't have working callbacks -- although, from the YAML it looks like they should work. There might be a bug in there.

The actual filter generation callbacks work -- if you replace "lp_taps" in the low-pass filter with "firdes.low_pass(1, samp_rate, cutoff_high, transition, firdes.WIN_HANN), for instance, then changing the parameters with a QT GUI Range slider will work just fine. It's just the convenience blocks which don't work.

Nick

On Wed, Mar 3, 2021 at 7:15 PM Jay Patel <patel999jay@gmail.com> wrote:

Hi all,

I am using GNURadio example Filter Introduction flow graph which shows basic introduction of filtering. I want to change the no. of taps while running the program. I tried to put the qt gui range but it looks like GNURadio creates/calculates taps as a static vector in the start of the execution of the flow graph.

Is there a work around this ?  I mean can I put a slider or counter for changing the transition_width which changes the number of taps while running the flow graph ?

Thanks. Any suggestions are appreciated.

With Regards,

Jay Patel