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# Gneerating Filter Coefficients The scripts below are used in [GNU Octave][GNU Octave] which should be available on most platforms including Linux, Mac and Windows. On Debian and other Debian derived Linux distributions, Octave can be installed using: `sudo apt install octave octave-signal`. Filter coefficients can be generated as follows by running the `octave` command in the same directory as the scripts and this Readme file: ``` octave:1> pkg load signal octave:2> f = make_filter (8, 128, 100.3) ; # f = make_fip_filter (8, 128, 100.3) ; # Coeff. count : 4922 # Fudge factor : 1.2018769 # Pass band width : 0.0039062499 (should be 0.0039062500) # Stop band atten. : 100.71 dB # -3dB band Width : 0.490 # half length : 2464 # increment : 128 ``` The parameters above generate the coefficient set used in `src/fastest_coeffs.h`. [GNU Octave]: https://www.gnu.org/software/octave/