www.pudn.com > iir.rar > iir.h
/* ==================================================================
File name : IIR.H
Originator : Advanced Embeeded Control (AEC)
Texas Instruments Inc.
Description:
Header file containing object definitions, proto type declaration and
default object initializers for IIR Filter.
===================================================================
History:
-------------------------------------------------------------------
12-05-2003 Release Rev 1.0
-------------------------------------------------------------------*/
#ifndef __IIR_H__
#define __IIR_H__
#define NULL 0
/*----------------------------------------------------------------
Define the structure of the IIR5BIQ16 Filter Module
-----------------------------------------------------------------*/
typedef struct {
void (*init)(void *); /* Ptr to Init funtion */
void (*calc)(void *); /* Ptr to calc fn */
int *coeff_ptr; /* Pointer to Filter coefficient */
int *dbuffer_ptr; /* Delay buffer ptr */
int nbiq; /* No of biquad */
int input; /* Latest Input sample */
int isf; /* Input Scale Factor */
int qfmat; /* Q format of coeff */
int output; /* Filter Output */
}IIR5BIQ16;
/*---------------------------------------------------------------
Define the structure of the IIR5BIQ32 Filter Module
-----------------------------------------------------------------*/
typedef struct {
void (*init)(void *); /* Ptr to init fn */
void (*calc)(void *); /* Ptr to calc fn */
long *coeff_ptr; /* Pointer to Filter coefficient */
long *dbuffer_ptr; /* Delay buffer ptr */
int nbiq; /* No of biquad */
int input; /* Latest Input sample */
long isf; /* Input Scale Factor */
long output32; /* Filter Output (Q30) */
int output16; /* Filter Output (Q14) */
int qfmat; /* Q format of coeff */
}IIR5BIQ32;
/*---------------------------------------------------------------
Define a Handles for the Filter Modules
-----------------------------------------------------------------*/
typedef IIR5BIQ16 *IIR5BIQ16_handle;
typedef IIR5BIQ32 *IIR5BIQ32_handle;
#define IIR5BIQ16_DEFAULTS { (void (*)(void *))IIR5BIQ16_init,\
(void (*)(void *))IIR5BIQ16_calc,\
(int *)NULL, \
(int *)NULL, \
0, \
0, \
0, \
0, \
0}
#define IIR5BIQ32_DEFAULTS { (void (*)(void *))IIR5BIQ32_init,\
(void (*)(void *))IIR5BIQ32_calc, \
(long *)NULL, \
(long *)NULL, \
0, \
0, \
0, \
0, \
0, \
0}
/*-------------------------------------------------------------
Prototypes for the functions
---------------------------------------------------------------*/
void IIR5BIQ16_calc(void *);
void IIR5BIQ32_calc(void *);
/******** Sample IIR co-efficients ****************************/
void IIR5BIQ16_init(IIR5BIQ16 *);
void IIR5BIQ32_init(IIR5BIQ32 *);
/* LPF co-efficients for IIR16 module */
#define IIR16_LPF_COEFF {\
-746,4846,1056,2111,1056,\
-1032,5001,1120,2239,1120,\
-1639,5330,1192,2385,1192,\
-2647,5877,1211,2422,1211,\
-4206,6722,872,1745,872,\
-6573,8005,4861,9722,4861}
#define IIR16_LPF_ISF 4092
#define IIR16_LPF_NBIQ 6
#define IIR16_LPF_QFMAT 13
/* HPF co-efficients for IIR16 module */
#define IIR16_HPF_COEFF {\
0,-2597,0,-3340,3340,\
-2211,-2396,1746,-3492,1746,\
-4745,2276,2007,-4014,2007,\
-7046,5310,13685,-27370,13685}
#define IIR16_HPF_ISF 5595
#define IIR16_HPF_NBIQ 4
#define IIR16_HPF_QFMAT 13
/* BPF co-efficients for IIR16 module */
#define IIR16_BPF_COEFF {\
-1078,1437,-367,0,367,\
-1395,935,713,43,713,\
-1496,2176,594,-917,594,\
-1855,994,1022,-329,1022,\
-1890,2462,18610,-25359,18610}
#define IIR16_BPF_ISF 721
#define IIR16_BPF_NBIQ 5
#define IIR16_BPF_QFMAT 11
/* BSF co-efficients for IIR16 module */
#define IIR16_BSF_COEFF {\
-1532,1626,859,-781,859,\
-1889,1374,2032,-1644,2032,\
-1906,2168,22098,-22158,22098}
#define IIR16_BSF_ISF 366
#define IIR16_BSF_NBIQ 3
#define IIR16_BSF_QFMAT 11
/* LPF co-efficients for IIR32 module */
#define IIR32_LPF_COEFF {\
-24444800,158794151,8647611,17295223,8647611,\
-33805581,163869390,36741777,73483554,36741777,\
-53695266,174653202,39535955,79071910,39535955,\
-86750921,192575355,40880726,81761451,40880726,\
-137806611,220256787,30931379,61862757,30931379,\
-215373186,262311922,564004144,1128008289,564004144}
#define IIR32_LPF_ISF 134086103
#define IIR32_LPF_NBIQ 6
#define IIR32_LPF_QFMAT 28
/* HPF co-efficients for IIR32 module */
#define IIR32_HPF_COEFF {\
0,-85096979,0,-29857202,29857202,\
-72466417,-78522171,97363917,-194727833,97363917,\
-155480100,74571693,88837952,-177675903,88837952,\
-230891969,173985995,715131301,-1430262602,715131301}
#define IIR32_HPF_ISF 183338477
#define IIR32_HPF_NBIQ 4
#define IIR32_HPF_QFMAT 28
/* BPF co-efficients for IIR32 module */
#define IIR32_BPF_COEFF {\
-70620977,94154018,-24080177,0,24080177,\
-91416523,61304763,46717868,2819319,46717868,\
-98072227,142585344,38933432,-60070942,38933432,\
-121545500,65135203,66986143,-21532217,66986143,\
-123895267,161346553,1219596683,-1661914443,1219596683}
#define IIR32_BPF_ISF 47247113
#define IIR32_BPF_NBIQ 5
#define IIR32_BPF_QFMAT 27
/* BSF co-efficients for IIR32 module */
#define IIR32_BSF_COEFF {\
-100408845,106578277,56314524,-51161340,56314524,\
-123814194,90035192,133182068,-107730821,133182068,\
-124894576,142053666,1448196385,-1452129490,1448196385}
#define IIR32_BSF_ISF 23999390
#define IIR32_BSF_NBIQ 3
#define IIR32_BSF_QFMAT 27
#endif