Version 3.2

include/BiQuad.h

@@ -0,0 +1,40 @@
+/*******************************************/
+/*
+   BiQuad (2-pole, 2-zero) Filter Class,
+   by Perry R. Cook, 1995-96.
+   Modified by Julius Smith, 2000:
+     setA1,setA2,setB1,setB2
+
+   See books on filters to understand
+   more about how this works.  Nothing
+   out of the ordinary in this version.
+*/
+/*******************************************/
+
+#if !defined(__BiQuad_h)
+#define __BiQuad_h
+
+#include "Filter.h"
+
+class BiQuad : public Filter
+{
+protected:  
+  MY_FLOAT poleCoeffs[2];
+  MY_FLOAT zeroCoeffs[2];
+public:
+  BiQuad();
+  ~BiQuad();
+  void clear();
+  void setA1(MY_FLOAT a1);
+  void setA2(MY_FLOAT a2);
+  void setB1(MY_FLOAT b1);
+  void setB2(MY_FLOAT b2);
+  void setPoleCoeffs(MY_FLOAT *coeffs);
+  void setZeroCoeffs(MY_FLOAT *coeffs);
+  void setGain(MY_FLOAT aValue);
+  void setFreqAndReson(MY_FLOAT freq, MY_FLOAT reson);
+  void setEqualGainZeroes();
+  MY_FLOAT tick(MY_FLOAT sample);
+};
+
+#endif