filter.h (1120B)
1 /* 2 3 TiMidity -- Experimental MIDI to WAVE converter 4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi> 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 20 filter.h : written by Vincent Pagel ( pagel@loria.fr ) 21 22 implements fir antialiasing filter : should help when setting sample 23 rates as low as 8Khz. 24 25 */ 26 27 /* Order of the FIR filter = 20 should be enough ! */ 28 #define ORDER 20 29 #define ORDER2 ORDER/2 30 31 #ifndef PI 32 extern const float PI; 33 #endif 34 35 extern void antialiasing(Sample *sp, int32_t output_rate);