jens
dd0f54d3bc
git-svn-id: http://moon:8086/svn/software/trunk/libsrc/iir@1 b431acfa-c32f-4a4a-93f1-934dc6c82436
98 lines
2.9 KiB
C
Executable File
98 lines
2.9 KiB
C
Executable File
/******************************************************************************/
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/* iir.h */
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/******************************************************************************/
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#ifndef IIR_H
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#define IIR_H
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#include <stdio.h>
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#ifndef pi
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#define pi 3.1415926535897932384626433832795
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#endif
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#define IIR_FILTERTYPE_UNKNOWN 0x00000000
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#define IIR_FILTERTYPE_LOWPASS 0x00000001
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#define IIR_FILTERTYPE_HIGHPASS 0x00000002
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#define IIR_FILTERTYPE_BANDPASS 0x00000003
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#define IIR_FILTERTYPE_BANDSTOP 0x00000004
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#define IIR_FILTERTYPE_PEAKING 0x00000005
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#define IIR_FILTERTYPE_LOWSHELF 0x00000006
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#define IIR_FILTERTYPE_HIGHSHELF 0x00000007
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/******************************************************************************/
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#ifndef iir_float_t
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#define iir_float_t float
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#endif
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typedef struct _sComplex
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{
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iir_float_t pRealData, pImagData;
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} Complex;
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typedef struct _siir_coef_t
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{
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iir_float_t ak0, ak1, ak2;
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iir_float_t bk0, bk1, bk2;
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} iir_coef_t;
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typedef struct _siir_state_t
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{
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iir_float_t xn1, xn2;
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iir_float_t yn1, yn2;
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} iir_state_t;
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typedef struct _sIIRParam
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{
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/* General Params */
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iir_float_t fg, Qf;
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/* for shelving EQs */
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iir_float_t beta;
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/* for peaking and shelving EQs */
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iir_float_t A;
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}IIRPARAM;
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typedef struct _siir_lin_t
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{
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unsigned order;
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iir_float_t *pX, *pY;
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} iir_lin_t;
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/******************************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void IIRInit(iir_state_t *pState, unsigned order);
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int IIRCalcPartFilterCoeff1(iir_coef_t *pCoeff, iir_float_t fa, iir_float_t fg, iir_float_t qp, unsigned filterType);
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int IIRCalcPartFilterCoeff2(iir_coef_t *pCoeff, iir_float_t A, iir_float_t fa, iir_float_t fg, iir_float_t qp, unsigned filterType);
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void IIRCalcFilterCoeff(iir_coef_t *pCoeff, iir_float_t fa, iir_float_t fg, iir_float_t q, unsigned order, unsigned filterType);
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iir_float_t IIRBilTrans(iir_float_t fg, iir_float_t fa);
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iir_float_t IIRCalcQp(unsigned p, unsigned N);
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void IIR(iir_state_t *pState, iir_coef_t *pCoeff, iir_float_t *xn, iir_float_t *yn, unsigned order, unsigned numPoints);
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iir_float_t IIRS(iir_state_t *pState, iir_coef_t *pCoeff, iir_float_t xn, unsigned order);
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void IIRSSE(iir_coef_t *pCoeff, iir_float_t *xn, iir_float_t *yn, unsigned order, unsigned numPoints);
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void IIRPrintCoeff(FILE *pFile, iir_coef_t *pCoeff, unsigned N);
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void ScaleCoeff(iir_coef_t *pCoeff);
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iir_float_t MinMag(iir_float_t val1, iir_float_t val2);
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iir_float_t MaxMag(iir_float_t val1, iir_float_t val2);
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void IIR_lin_init(iir_lin_t *pObj, unsigned order);
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void IIR_lin_free(iir_lin_t *pObj);
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iir_float_t IIR_lin_process(iir_lin_t *pObj, iir_float_t *pB, iir_float_t *pA, iir_float_t x);
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#ifdef __cplusplus
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}
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#endif
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#endif // IIR_H
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/******************************************************************************/
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