filter.h
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上传日期:2022-07-21
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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
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- 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);