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 +1,68 @@
+/******************************************************************************/
+
+/******************************************************************************/
+#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
+
+/******************************************************************************/
+typedef struct _sComplex
+{
+	double pRealData, pImagData;
+} Complex;
+
+class CIIRCoeff
+{
+public:
+	CIIRCoeff(unsigned Na=0, unsigned Nb=0)
+	{
+		Init(Na, Nb);
+	}
+	~CIIRCoeff()
+	{
+		if(m_pak!=0)
+			delete [] m_pak;
+
+		if(m_pbk!=0)
+			delete [] m_pbk;
+	}
+	void Init(unsigned Na=0, unsigned Nb=0)
+	{
+		m_pak= 0;
+		m_pbk= 0;
+		m_Na = Na;
+		m_Nb = Nb;
+		m_aScale = 1.0;
+		m_bScale = 1.0;
+
+		if(Na!=0)
+			m_pak = new double[Na+1];
+
+		if(Nb!=0)
+			m_pbk = new double[Nb+1];
+	}
+
+	double *m_pak, m_aScale;
+	unsigned m_Na;
+	double *m_pbk, m_bScale;
+	unsigned m_Nb;
+};
+
+/******************************************************************************/
+int IIRCalcPartFilterCoeff1(CIIRCoeff *pCoeff, double fg, double fa, double Qi, unsigned filterType);
+int IIRCalcPartFilterCoeff2(CIIRCoeff *pCoeff, double fg, double fa, double Qi, unsigned filterType);
+int IIRCalcFilterCoeff(double fg, double fa, double Qi, unsigned N, CIIRCoeff *pCoeff, unsigned filterType);
+double IIRBilTrans(double fg, double fa);
+double IIRCalcQp(unsigned p, unsigned N);
+unsigned IIRMulPolynom(double *pA, unsigned orderA, double *pB, unsigned orderB, double *pProduct);
+void IIR(double *xn, double *yn, CIIRCoeff *pCoeff, unsigned numPoints);
+void IIRPrintCoeff(FILE *pFile, CIIRCoeff *pCoeff, unsigned N);
+void ScaleCoeff(CIIRCoeff *pCoeff);
+double MinMag(double val1, double val2);
+double MaxMag(double val1, double val2);
+
+/******************************************************************************/