2 * SpanDSP - a series of DSP components for telephony
4 * biquad.h - General telephony bi-quad section routines (currently this just
5 * handles canonic/type 2 form)
7 * Written by Steve Underwood <steveu@coppice.org>
9 * Copyright (C) 2001 Steve Underwood
11 * All rights reserved.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 struct biquad2_state
{
40 static inline void biquad2_init(struct biquad2_state
*bq
,
41 int32_t gain
, int32_t a1
, int32_t a2
, int32_t b1
, int32_t b2
)
53 static inline int16_t biquad2(struct biquad2_state
*bq
, int16_t sample
)
58 z0
= sample
*bq
->gain
+ bq
->z1
*bq
->a1
+ bq
->z2
*bq
->a2
;
59 y
= z0
+ bq
->z1
*bq
->b1
+ bq
->z2
*bq
->b2
;
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