Version 0.99

OneZero.cpp

@@ -0,0 +1,64 @@
+/*******************************************/
+/*  One Zero Filter Class,                 */
+/*  by Perry R. Cook, 1995-96              */ 
+/*  The parameter gain is an additional    */
+/*  gain parameter applied to the filter   */  
+/*  on top of the normalization that takes */
+/*  place automatically.  So the net max   */
+/*  gain through the system equals the     */
+/*  value of gain.  sgain is the combina-  */
+/*  tion of gain and the normalization     */
+/*  parameter, so if you set the poleCoeff */
+/*  to alpha, sgain is always set to       */
+/*  gain / (1.0 - fabs(alpha)).            */
+/*******************************************/
+
+#include "OneZero.h"
+
+OneZero :: OneZero()
+{
+    gain = 1.0;
+    zeroCoeff = 1.0;
+    sgain = 0.5;
+    inputs = (MY_FLOAT *) malloc(MY_FLOAT_SIZE);
+    this->clear();
+}
+
+OneZero :: ~OneZero()
+{
+    free(inputs);
+}
+
+void OneZero :: clear()
+{
+    inputs[0] = 0.0;
+    lastOutput = 0.0;
+}
+
+void OneZero :: setGain(MY_FLOAT aValue)
+{
+    gain = aValue;
+    if (zeroCoeff > 0.0)                  /*  Normalize gain to 1.0 max  */
+        sgain = gain / (1.0 + zeroCoeff);
+    else
+        sgain = gain / (1.0 - zeroCoeff);
+}
+
+void OneZero :: setCoeff(MY_FLOAT aValue)
+{
+    zeroCoeff = aValue;
+    if (zeroCoeff > 0.0)                  /*  Normalize gain to 1.0 max  */
+        sgain = gain / (1.0 + zeroCoeff);
+    else
+        sgain = gain / (1.0 - zeroCoeff);
+}
+
+MY_FLOAT OneZero :: tick(MY_FLOAT sample) /*   Perform Filter Operation  */
+{
+    MY_FLOAT temp;
+    temp = sgain * sample;
+    lastOutput = (inputs[0] * zeroCoeff) + temp;
+    inputs[0] = temp;
+    return lastOutput;
+}
+