Diff: SpactrumAnalysisClasses/Hamming.hpp

Revision:

0:c5b026c2d07e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SpactrumAnalysisClasses/Hamming.hpp	Sun Jul 26 02:48:23 2015 +0000
@@ -0,0 +1,44 @@
+//-------------------------------------------------------------------
+// Hamming windowing with zero-padding
+// Copyright (c) 2014 MIKAMI, Naoki,  2014/12/21
+//-------------------------------------------------------------------
+
+#ifndef HAMMING_WINDOW_HPP
+#define HAMMING_WINDOW_HPP
+
+#include "mbed.h"
+
+namespace Mikami
+{
+    class HammingWindow
+    {
+    private:
+        const int N_;
+        const int NFFT_;
+                
+        float* w_;
+
+    public:
+        // Constructor
+        HammingWindow(uint16_t nData, uint16_t nFft)
+                : N_(nData), NFFT_(nFft)
+        {
+            w_ = new float[nData];
+            float pi2L = 6.283185f/(float)nData;
+            for (int k=0; k<nData; k++)
+                w_[k] = 0.54f - 0.46f*cosf(k*pi2L);
+        }
+        
+        // Destructor
+        ~HammingWindow() {delete[] w_;}
+        
+        // Windowing
+        void Execute(const float x[], float y[])
+        {
+            for (int n=0; n<N_; n++) y[n] = x[n]*w_[n];
+            for (int n=N_; n<NFFT_; n++) y[n] = 0;
+        }
+    };
+}
+#endif  // HAMMING_WINDOW_HPP
+