Diff: filter.h

Revision:

0:09ae59836ddc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/filter.h	Wed Oct 25 12:35:24 2017 +0000
@@ -0,0 +1,43 @@
+#ifndef FILTERJWZ
+#define FILTERJWZ
+
+#include "mbed.h"
+//#include <math.h>
+
+class LowPass{
+    public:
+    float yprev;
+    float a;
+    
+    float filter(float x);
+};
+
+class HighPass{
+    public:
+    float xprev[2];           // to remember the 2 previous input values
+    float yprev;              // to remember the previous output value
+    float a;                  /*RC / (RC + dt)*/
+    
+    float filter(float x);
+};
+
+class Notch{
+    public:
+    float xprev[3];
+    float yprev[2];
+    float lambda;
+    float b;
+    
+    float filter(float x);
+};
+
+class ButterLow{
+    public:
+    float xprev[3];
+    float yprev[2];
+    float w; //wc: cutoff frequency
+    
+    float filter(float x);
+};
+
+#endif
\ No newline at end of file