Version 0.99

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 * MY_FLOAT_SIZE);
+    zeroCoeffs[0] = 0.0;
+    zeroCoeffs[1] = 0.0;
+    gain = 1.0;
+    this->clear();
+}
+
+TwoZero :: ~TwoZero()
+{
+    free(inputs);
+}
+
+void TwoZero :: clear()
+{
+    inputs[0] = 0.0;
+    inputs[1] = 0.0;
+    lastOutput = 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;
+}
+