Initial import

git-svn-id: http://moon:8086/svn/software/trunk/libsrc/iir@1 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-07-19 07:44:42 +00:00
commit dd0f54d3bc
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+/******************************************************************************/
+/* iir.h
+/******************************************************************************/
+#ifndef IIR_H
+#define IIR_H
+
+#define	pi			3.1415926535897932384626433832795
+
+#define IIR_FILTERTYPE_UNKNOWN     0x00000000
+#define IIR_FILTERTYPE_LOWPASS     0x00000001
+#define IIR_FILTERTYPE_HIGHPASS    0x00000002
+#define IIR_FILTERTYPE_BANDPASS    0x00000003
+#define IIR_FILTERTYPE_BANDSTOP    0x00000004
+#define IIR_FILTERTYPE_PEAKING     0x00000005
+#define IIR_FILTERTYPE_LOWSHELF    0x00000006
+#define IIR_FILTERTYPE_HIGHSHELF   0x00000007
+
+
+/******************************************************************************/
+typedef struct _sComplex
+{
+	double pRealData, pImagData;
+} Complex;
+
+typedef struct _sIIRCoeff
+{
+
+	double ak0, ak1, ak2;
+	double bk0, bk1, bk2;
+	double xn1, xn2;
+	double yn1, yn2;
+
+}IIRCOEFF;
+
+typedef struct _sIIRParam
+{
+	/* General Params */
+	double fg, Qf;
+
+	/* for shelving EQs */
+	double beta;
+
+	/* for peaking and shelving EQs */
+	double A;
+}IIRPARAM;
+
+/******************************************************************************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void IIRInit(struct _sIIRCoeff *pCoeff, unsigned order);
+int IIRCalcPartFilterCoeff1(struct _sIIRCoeff *pCoeff, double fa, double fg, double qp, unsigned filterType);
+int IIRCalcPartFilterCoeff2(struct _sIIRCoeff *pCoeff, double A, double fa, double fg, double qp, unsigned filterType);
+void IIRCalcFilterCoeff(struct _sIIRCoeff *pCoeff, double fa, double fg, double q, unsigned order, unsigned filterType);
+
+double IIRBilTrans(double fg, double fa);
+double IIRCalcQp(unsigned p, unsigned N);
+void IIR(struct _sIIRCoeff *pCoeff, double *xn, double *yn, unsigned order, unsigned numPoints);
+void IIRPrintCoeff(FILE *pFile, struct _sIIRCoeff *pCoeff, unsigned N);
+void ScaleCoeff(struct _sIIRCoeff *pCoeff);
+double MinMag(double val1, double val2);
+double MaxMag(double val1, double val2);
+
+#ifdef __cplusplus
+}
+#endif
+#endif // IIR_H
+/******************************************************************************/