Hi all,
A brief update on the new features added to the filter design tool[1]
--IIR Filter Design (Scipy Based)
-Butterworth
-Elliptic
-Chebyshev-1
-Chebyshev-2
-Bessel
--Pole-zero plot now supports addition, deletion of poles/zeros with conjugate support.
A small video showing some of the added features can be found here[2].
At first I started using Robert McGwier's existing code[3] and added features to that as suggested by Tom and Martin. Later finding that Scipy's filter design functions[4] are very much optimized and robust, I decided to use those. Martin also pointed out that it will
just be a duplication of work and suggested me to use scipy for IIR design.
I did a basic integration of the code to gr-filter component of GNU Radio[5]. I haven't pushed icons yet to the branch. It would be really helpful if anyone can comment on the current integration, so that I can make suitable modifications.
In next few weeks I will be adding some special filters like half-band filter to the design tool, then will proceed with integration of gr_filter_design to GRC and will try to add QA tests for filter design routines wherever they are missing.
[1]https://github.com/zeroXzero/gr-filtdes
[2]http://www.youtube.com/watch?v=20ZrfUZjUUA
[3]http://gnuradio.org/cgit/n4hy.git/log/?h=n4hy_iir
[4]http://docs.scipy.org/doc/scipy/reference/signal.html
[5]https://github.com/zeroXzero/gnuradio-sreeraj Branch:
filtdes_gui
---
Regards
Sreeraj Rajendran
http://home.iitb.ac.in/~rsreeraj