Diff: Biquad.hpp

Revision:

7:34eced3597bb

Parent:

6:116f72cda0f4

--- a/Biquad.hpp	Sat Jul 25 06:41:36 2015 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,44 +0,0 @@
-//--------------------------------------------------------------
-// Biquad filter for IIR filter of cascade structure
-// 2014/10/21, Copyright (c) 2014 MIKAMI, Naoki
-//--------------------------------------------------------------
-
-#ifndef IIR_BIQUAD_HPP
-#define IIR_BIQUAD_HPP
-
-#include "mbed.h"
-
-// 2nd order IIR filter
-class Biquad
-{
-public:
-    struct Coefs { float a1, a2, b1, b2; };
-
-    Biquad() {}     // Default constructore
-
-    Biquad(const Coefs ck)
-        : a1_(ck.a1), a2_(ck.a2), b1_(ck.b1), b2_(ck.b2)
-    { Clear(); }       
-
-    float Execute(float xn)
-    {
-        float un = xn + a1_*un1_ + a2_*un2_;
-        float yn = un + b1_*un1_ + b2_*un2_;
-        
-        un2_ = un1_;
-        un1_ = un;
-        
-        return yn;
-    }
-
-    void Clear() { un1_ = un2_ = 0; }
-
-private:
-    float a1_, a2_, b1_, b2_;
-    float un1_, un2_;
-
-    Biquad(const Biquad&);
-};
-
-#endif  // IIR_BIQUAD_HPP
-