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
21 changed files with 1912 additions and 0 deletions
@@ -0,0 +1,97 @@
+/******************************************************************************/
+/* iir.h */
+/******************************************************************************/
+#ifndef IIR_H
+#define IIR_H
+
+#include <stdio.h>
+
+#ifndef pi
+#define	pi			3.1415926535897932384626433832795
+#endif
+
+#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
+
+
+/******************************************************************************/
+#ifndef iir_float_t
+#define iir_float_t float
+#endif
+
+typedef struct _sComplex
+{
+	iir_float_t pRealData, pImagData;
+} Complex;
+
+typedef struct _siir_coef_t
+{
+
+	iir_float_t ak0, ak1, ak2;
+	iir_float_t bk0, bk1, bk2;
+
+} iir_coef_t;
+
+typedef struct _siir_state_t
+{
+
+	iir_float_t xn1, xn2;
+	iir_float_t yn1, yn2;
+
+} iir_state_t;
+
+typedef struct _sIIRParam
+{
+	/* General Params */
+	iir_float_t fg, Qf;
+
+	/* for shelving EQs */
+	iir_float_t beta;
+
+	/* for peaking and shelving EQs */
+	iir_float_t A;
+}IIRPARAM;
+
+typedef struct _siir_lin_t
+{
+	unsigned order;
+	iir_float_t *pX, *pY;
+} iir_lin_t;
+
+
+/******************************************************************************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void IIRInit(iir_state_t *pState, unsigned order);
+int IIRCalcPartFilterCoeff1(iir_coef_t *pCoeff, iir_float_t fa, iir_float_t fg, iir_float_t qp, unsigned filterType);
+int IIRCalcPartFilterCoeff2(iir_coef_t *pCoeff, iir_float_t A, iir_float_t fa, iir_float_t fg, iir_float_t qp, unsigned filterType);
+void IIRCalcFilterCoeff(iir_coef_t *pCoeff, iir_float_t fa, iir_float_t fg, iir_float_t q, unsigned order, unsigned filterType);
+
+iir_float_t IIRBilTrans(iir_float_t fg, iir_float_t fa);
+iir_float_t IIRCalcQp(unsigned p, unsigned N);
+void IIR(iir_state_t *pState, iir_coef_t *pCoeff, iir_float_t *xn, iir_float_t *yn, unsigned order, unsigned numPoints);
+iir_float_t IIRS(iir_state_t *pState, iir_coef_t *pCoeff, iir_float_t xn, unsigned order);
+
+void IIRSSE(iir_coef_t *pCoeff, iir_float_t *xn, iir_float_t *yn, unsigned order, unsigned numPoints);
+void IIRPrintCoeff(FILE *pFile, iir_coef_t *pCoeff, unsigned N);
+void ScaleCoeff(iir_coef_t *pCoeff);
+iir_float_t MinMag(iir_float_t val1, iir_float_t val2);
+iir_float_t MaxMag(iir_float_t val1, iir_float_t val2);
+
+void IIR_lin_init(iir_lin_t *pObj, unsigned order);
+void IIR_lin_free(iir_lin_t *pObj);
+iir_float_t IIR_lin_process(iir_lin_t *pObj, iir_float_t *pB, iir_float_t *pA, iir_float_t x);
+
+#ifdef __cplusplus
+}
+#endif
+#endif // IIR_H
+/******************************************************************************/