jens
dd0f54d3bc
git-svn-id: http://moon:8086/svn/software/trunk/libsrc/iir@1 b431acfa-c32f-4a4a-93f1-934dc6c82436
70 lines
2.1 KiB
Plaintext
Executable File
70 lines
2.1 KiB
Plaintext
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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#define pi 3.1415926535897932384626433832795
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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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typedef struct _sComplex
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{
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double pRealData, pImagData;
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} Complex;
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typedef struct _sIIRCoeff
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{
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double ak0, ak1, ak2;
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double bk0, bk1, bk2;
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double xn1, xn2;
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double yn1, yn2;
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}IIRCOEFF;
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typedef struct _sIIRParam
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{
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/* General Params */
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double fg, Qf;
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/* for shelving EQs */
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double beta;
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/* for peaking and shelving EQs */
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double A;
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}IIRPARAM;
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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(struct _sIIRCoeff *pCoeff, unsigned order);
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int IIRCalcPartFilterCoeff1(struct _sIIRCoeff *pCoeff, double fa, double fg, double qp, unsigned filterType);
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int IIRCalcPartFilterCoeff2(struct _sIIRCoeff *pCoeff, double A, double fa, double fg, double qp, unsigned filterType);
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void IIRCalcFilterCoeff(struct _sIIRCoeff *pCoeff, double fa, double fg, double q, unsigned order, unsigned filterType);
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double IIRBilTrans(double fg, double fa);
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double IIRCalcQp(unsigned p, unsigned N);
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void IIR(struct _sIIRCoeff *pCoeff, double *xn, double *yn, unsigned order, unsigned numPoints);
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void IIRPrintCoeff(FILE *pFile, struct _sIIRCoeff *pCoeff, unsigned N);
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void ScaleCoeff(struct _sIIRCoeff *pCoeff);
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double MinMag(double val1, double val2);
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double MaxMag(double val1, double val2);
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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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