Cleanest way to store lists of filter coefficients in a C header

Posted by Nick T on Stack Overflow See other posts from Stack Overflow or by Nick T
Published on 2010-04-21T19:18:12Z Indexed on 2010/04/21 19:23 UTC
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I have many (~100 or so) filter coefficients calculated with the aid of some Matlab and Excel that I want to dump into a C header file for general use, but I'm not sure what the best way to do this would be. I was starting out as so:

#define BUTTER 1
#define BESSEL 2
#define CHEBY 3
#if FILT_TYPE == BUTTER
    #if FILT_ROLLOFF == 0.010
        #define B0 256
        #define B1 512
        #define B2 256
        #define A1 467
        #define A2 -214
    #elif FILT_ROLLOFF == 0.015
        #define B0 256
        #define B1 512
// and so on...

However, if I do that and shove them all into a header, I need to set the conditionals (FILT_TYPE, FILT_ROLLOFF) in my source before including it, which seems kinda nasty. What's more, if I have 2+ different filters that want different roll-offs/filter types it won't work. I could #undef my 5 coefficients (A1-2, B0-2) in that coefficients file, but it still seems wrong to have to insert an #include buried in code.

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Cleanest way to store lists of filter coefficients in a C header - Developer IT

Cleanest way to store lists of filter coefficients in a C header

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