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