Version 0.99

OnePole.cpp

@@ -0,0 +1,81 @@
+/*******************************************/
+/*  One Pole 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 "OnePole.h"
+
+OnePole :: OnePole() : Filter()
+{
+    poleCoeff = 0.9;
+    gain = 1.0;
+    sgain = 0.1;
+    outputs = (MY_FLOAT *) malloc(MY_FLOAT_SIZE);
+    outputs[0] = 0.0;
+}
+
+OnePole :: ~OnePole()    
+{
+    free(outputs);
+}
+
+void OnePole :: clear()
+{
+    outputs[0] = 0.0;
+    lastOutput = 0.0;
+}
+
+void OnePole :: setPole(MY_FLOAT aValue)
+{
+    poleCoeff = aValue;
+    if (poleCoeff > 0.0)                   /*  Normalize gain to 1.0 max */
+	sgain = gain * (1.0 - poleCoeff);
+    else
+	sgain = gain * (1.0 + poleCoeff);
+}
+
+void OnePole :: setGain(MY_FLOAT aValue)
+{
+    gain = aValue;
+    if (poleCoeff > 0.0)        
+	sgain = gain * (1.0 - poleCoeff);  /*  Normalize gain to 1.0 max */
+    else
+	sgain = gain * (1.0 + poleCoeff);
+}
+
+MY_FLOAT OnePole :: tick(MY_FLOAT sample)  /*   Perform Filter Operation */
+{
+    outputs[0] = (sgain * sample) + (poleCoeff * outputs[0]);              
+    lastOutput = outputs[0];
+    return lastOutput;
+}
+
+/************  Test Main  ************************/
+/*
+#include <stdio.h>
+
+void main()
+{
+    long i;
+    OnePole test;
+    test.setPole(0.99);
+    for (i=0;i<150;i++) printf("%lf  ",test.tick(1.0));
+    printf("\n\n");
+
+    test.clear();
+    test.setPole(0.9);
+    test.setGain(2.0);
+    for (i=0;i<150;i++) printf("%lf  ",test.tick(0.5));
+    printf("\n\n");
+}
+*/