John:
Well, there's already gr.firdes, which can be called directly from python, and produce coefficients that can be easily transformed into whatever you need. Granted, that's only for relatively-simple filters. from gnuradio import gr coeffs=gr.firdes.low_pass(1.0,samp_rate,corner_freq,transition_width,widnow,beta) And then do whatever you want with the resulting coefffs (like scaling to fixed-point 16-bit values, for example) -Marcus On 26 Jun 2012 13:21, John Malsbury wrote: > That is pretty awesome, Sreeraj. Is the output of the program a set of co-efficients to be copy-pasted, a compilable block, or something else? It might be useful to have a feature where the user can call a custom python script with the co-efficients passed as arguments. This would allow users to easily generate formatted files, like those used by Xilinx coregen or some custom format that might be poked to the FPGA, for example. It would be neat to make some updates to GRC to allow the user to open the utility and re-generate co-efficients as they do in MATLAB. > > This is making me think of some other potential projects, like a similar 'digital modulation designer'. For example, we might use a single block for all modulation types, select the modulation type and parameters, run simulations to determine BER vs. Eb/N0, theoretical discrete constellations, ACPR, PAR, etc. Or perhaps, a "packet designer" where you can graphically configure FEC, interleaving, sync words, etc. Obviously, the complexity on this one could grow _real fast_. > > Just ideas... Hopefully you'll have a chance to present your approach to this at the GNU Radio conference. > > -John > > On 06/26/2012 09:35 AM, Ben Hilburn wrote: > >> Sreeraj - >> >> I just wanted to echo Tom's thoughts that this look really, really great! I can't wait to see the final version! This will really be a significant contribution to the capabilities of GNU Radio, in my opinion. >> >> Cheers, >> Ben >> >> On Sun, Jun 24, 2012 at 7:05 AM, sreeraj r <[email protected] [6]> wrote: >> >>> Hi all, >>> During the initial phase of SoC, I was concentrating on improving the GUI for filter designing. A brief list of some of the major features added to the filter design tool (gr_filter_design) is given below >>> >>> --Support for multiple views (grid and old tabbed view) >>> >>> --Stop-band attenuation configuration via Band-diagram >>> --Editable pole-zero plots with conjugate movement support >>> --Impulse, Step responses, phase delay plots >>> --Overlay plots >>> >>> A complete update history along with the code can be found in the github repository(https://github.com/zeroXzero/gr-filtdes [1]). A small video on the current status of the tool can be found here http://www.youtube.com/watch?v=Oi6PTrht1F8&feature=plcp [2] >>> >>> The tool is not completely tested as some more bugs need to be patched. A few more feature additions like add/delete buttons for poles and zeros, alignment of band-diagram, addition of button icons etc are still pending. All these additions will be done with in a few days. In the meantime it would be really helpful if the community can provide feedback in terms of feature additions or bugs so that I can improve the design. >>> >>> After finishing this work I will start working on the actual IIR filter designs as gr-filter has already been merged to the master. >>> >>> --- >>> Regards >>> Sreeraj Rajendran >>> http://home.iitb.ac.in/~rsreeraj [3] >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> [email protected] [4] >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [5] >> >> _______________________________________________ Discuss-gnuradio mailing list [email protected] [7] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [8] Links: ------ [1] https://github.com/zeroXzero/gr-filtdes [2] http://www.youtube.com/watch?v=Oi6PTrht1F8&feature=plcp [3] http://home.iitb.ac.in/%7Ersreeraj [4] mailto:[email protected] [5] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [6] mailto:[email protected] [7] mailto:[email protected] [8] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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