>Thanks for the example links, they were very helpful. There were two
>things I was doing wrong: First I didn't use square brackets for the
>sets, and to use the biquad calculator featured on earlevel.com, the B
>coefficients needed to start with a 1.0 filler and the rest negated
>like this:
>
>Feed-forward taps: [a0,a1,a2]
>Feedback taps: [1,-b1,-b2]
>The linked .grc files work for me. (GRP 4.6.1) The filters therein
>behave as expected.
>Where is the new version?
>https://github.com/gnuradio/gnuradio/blob/next/gr-filter/python/design/filter_design.py>This one turns my cursor into a crosshair and does nothing else until I kill it.
Try launching gr_filter_design in apps (https://github.com/gnuradio/gnuradio/tree/next/gr-filter/apps/)
>The link you sent mentioned a new version but I haven't found it;
>googling "gr_filter_design" doesn't bring it up. I just see the
>FIR-only versions.
Default "gr_filter_design" in "next" branch supports IIR filter design. Also have a look at examples folder (gr_filtdes_*).
-Sreeraj