CQpub0 Mikami
The experiment using this program is introduced on "Interface" No.3, CQ publishing Co.,Ltd, 2015. 本プログラムを使った実験は，CQ出版社のインターフェース 2015年3月号で紹介しています．
Dependencies: DSProcessingIO mbed
Diff: TwoPhaseGenerator.hpp
- Revision:
- 0:a5a171eda3f8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TwoPhaseGenerator.hpp Tue Jul 15 09:11:35 2014 +0000
@@ -0,0 +1,42 @@
+//--------------------------------------------------------------
+// Two phase sin generator class
+// Copyright (c) 2014 MIKAMI, Naoki, 2014/06/23
+//--------------------------------------------------------------
+
+#ifndef TWO_PHASE_GENERATOR_HPP
+#define TWO_PHASE_GENERATOR_HPP
+
+#include "mbed.h"
+
+namespace Mikami
+{
+ class TwoPhaseGenerator
+ {
+ public:
+ // Constructor
+ TwoPhaseGenerator(float f0, float fs)
+ : a1_(cosf(6.283185f*f0/fs)),
+ b1_(sinf(6.283185f*f0/fs)),
+ xn1_(1.0f), yn1_(0.0f) {}
+
+ // -1.0f <= x1, x2 <= 1.0f
+ void Generate(float& xn, float& yn)
+ {
+ yn = a1_*yn1_ + b1_*xn1_; // sin
+ xn = -b1_*yn1_ + a1_*xn1_; // cos
+
+ float c1 = 1.5f - 0.5f*(xn*xn + yn*yn);
+
+ xn1_ = c1*xn;
+ yn1_ = c1*yn;
+ }
+
+ private:
+ const float a1_, b1_;
+ float xn1_, yn1_;
+
+ TwoPhaseGenerator(const TwoPhaseGenerator&);
+ TwoPhaseGenerator& operator=(const TwoPhaseGenerator&);
+ };
+}
+#endif // TWO_PHASE_GENERATOR_HPP