filter.h
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/*
TiMidity -- Experimental MIDI to WAVE converter
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
This program is free software; you can redistribute it and/or modify
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it under the terms of the Perl Artistic License, available in COPYING.
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filter.h : written by Vincent Pagel ( pagel@loria.fr )
implements fir antialiasing filter : should help when setting sample
rates as low as 8Khz.
*/
/* Order of the FIR filter = 20 should be enough ! */
#define ORDER 20
#define ORDER2 ORDER/2
#ifndef PI
#define PI 3.14159265
#endif
extern void antialiasing(Sample *sp, int32 output_rate);