iirfilt.h

DSP的实验测试程序

/* ==================================================================
File name:  IIRFILT.H                     

Originator: Digital Control Systems Group
            Texas Instruments
Description:  
Header file containing object definitions, proto type declaration and 
default object initializers for IIR Filter.
===================================================================
 History:
-------------------------------------------------------------------
5-2-2000    Release Rev 1.0                                                  
-------------------------------------------------------------------*/

#ifndef __IIRFILT_H__
#define __IIRFILT_H__
#define     NULL    0

 
/*----------------------------------------------------------------
Define the structure of the IIR5BIQ16 Filter Module 
-----------------------------------------------------------------*/
typedef struct {   
    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                 */
    void (*init)(void *);   /* Ptr to Init funtion           */
    void (*calc)(void *);   /* Ptr to calc fn                */
        }IIR5BIQ16;    


/*---------------------------------------------------------------
Define the structure of the IIR5BIQ32 Filter Module
-----------------------------------------------------------------*/
typedef struct {
    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                 */
    void (*init)(void *);   /* Ptr to init fn                */
    void (*calc)(void *);   /* Ptr to calc fn                */ 
    }IIR5BIQ32;
               
 
/*---------------------------------------------------------------
Define a Handles for the Filter Modules
-----------------------------------------------------------------*/
typedef IIR5BIQ16     *IIR5BIQ16_handle;
typedef IIR5BIQ32     *IIR5BIQ32_handle;    
        
          
#define IIR5BIQ16_DEFAULTS { (int *)NULL,   \
             (int *)NULL,   \
             0,             \
             0,             \
             0,             \
             0,             \
             0,             \
             (void (*)(void *))IIR5BIQ16_init,\
             (void (*)(void *))IIR5BIQ16_calc }    

#define IIR5BIQ32_DEFAULTS { (int *)NULL,   \
             (int *)NULL,   \
             0,             \
             0,             \
             0,             \
             0,             \
             0,             \
             (void (*)(void *))IIR5BIQ32_init,\
             (void (*)(void *))IIR5BIQ32_calc }                           


/*-------------------------------------------------------------
 Prototypes for the functions
---------------------------------------------------------------*/
void IIR5BIQ16_calc(void *);
void IIR5BIQ32_calc(void *);
 
void IIR5BIQ16_init(IIR5BIQ16 *);
void IIR5BIQ32_init(IIR5BIQ32 *);
 
#endif