Version 3.0

STK/TwoZero.cpp

@@ -0,0 +1,53 @@
+/*******************************************/
+/*  Two Zero Filter Class,                 */
+/*  by Perry R. Cook, 1995-96              */ 
+/*  See books on filters to understand     */
+/*  more about how this works.  Nothing    */
+/*  out of the ordinary in this version.   */
+/*******************************************/
+
+#include "TwoZero.h"
+
+TwoZero :: TwoZero() : Filter()
+{
+  inputs = (MY_FLOAT *) malloc(2 * sizeof(MY_FLOAT));
+  zeroCoeffs[0] = (MY_FLOAT) 0.0;
+  zeroCoeffs[1] = (MY_FLOAT) 0.0;
+  gain = (MY_FLOAT) 1.0;
+  this->clear();
+}
+
+TwoZero :: ~TwoZero()
+{
+  free(inputs);
+}
+
+void TwoZero :: clear()
+{
+  inputs[0] = (MY_FLOAT) 0.0;
+  inputs[1] = (MY_FLOAT) 0.0;
+  lastOutput = (MY_FLOAT) 0.0;
+}
+
+void TwoZero :: setZeroCoeffs(MY_FLOAT *coeffs)
+{
+  zeroCoeffs[0] = coeffs[0];
+  zeroCoeffs[1] = coeffs[1];
+}
+
+void TwoZero :: setGain(MY_FLOAT aValue)
+{
+  gain = aValue;
+}
+
+MY_FLOAT TwoZero :: tick(MY_FLOAT sample) // Perform Filter Operation
+{                                         // TwoZero is a two zero filter (duh!)
+                                          // Look it up in your favorite DSP text
+  lastOutput = zeroCoeffs[0] * inputs[0];
+  lastOutput += zeroCoeffs[1] * inputs[1];
+  inputs[1] = inputs[0];
+  inputs[0] = gain * sample;
+  lastOutput += inputs[0];
+  return lastOutput;
+}
+