iir16.h

freescale MAC DSP的算法库（FFT

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*************************************************************************
*
*  FILE NAME: iir16.h
*
*  PURPOSE: IIR16 functions and data structures declarations
*
*  AUTHOR: Andrey Butok
*	Modified by Igor Drozdinsky
*
***********************************************************************/
#ifndef _IIR_16_H_
#define _IIR_16_H_

#include "iir.h"

//16-bit Fractional IIR Filter
typedef struct tIir16Struct
	{
	Frac16* pIirCoef;                    //Coefficients for IIR-> {a0,a1,b1,a2,b2...}
	unsigned int    iIirCoefCount;	 //Number of Coefficients=2n+1 (n=1,2,3...)
	Frac16* pIirHistory;                 // Buffer for Save hisory between function calls -> {X1,Y1,X2,Y2,X3...}
	unsigned int    iIirHistoryCount;    // Number of values in History Buffer
	};


/************************************************************************
*     Function Prototypes
************************************************************************/

 // Computes a Infinite Impulse Response (IIR) filter for a array of 16-bit fractional data values.
 void IIR16_EMAC( struct tIir16Struct *pIIR, Frac16* pX, Frac16* pY, unsigned int n);
 void IIR16_MAC( struct tIir16Struct *pIIR, Frac16* pX, Frac16* pY, unsigned int n);

 //Performs the initialization for IIR16 function
struct tIir16Struct* IIR16Create( Frac16* pCoef, uint16 u16Num);

 //Deallocates the data structure initially allocated by IIR16Create
void IIR16Destroy( struct tIir16Struct* pIIR);


#ifdef __EMAC
	#define IIR16(w,x,y,z)	IIR16_EMAC(w,x,y,z)
#else
	#define IIR16(w,x,y,z)	IIR16_MAC(w,x,y,z)
#endif

#endif //_IIR_16_H_