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Dependencies:   BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed

MyClasses_Functions/Hamming.hpp@8:e7dc8658c5cd, 2016-04-19 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Apr 19 09:35:24 2016 +0000
Revision:
8:e7dc8658c5cd
Parent:
0:0e5131366580 
9

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:0e5131366580 1 //-------------------------------------------------------------------
MikamiUitOpen 0:0e5131366580 2 // Hamming windowing with zero-padding
MikamiUitOpen 0:0e5131366580 3 //
MikamiUitOpen 0:0e5131366580 4 // 2015/12/17, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:0e5131366580 5 //-------------------------------------------------------------------
MikamiUitOpen 0:0e5131366580 6
MikamiUitOpen 0:0e5131366580 7 #ifndef HAMMING_WINDOW_HPP
MikamiUitOpen 0:0e5131366580 8 #define HAMMING_WINDOW_HPP
MikamiUitOpen 0:0e5131366580 9
MikamiUitOpen 0:0e5131366580 10 #include "mbed.h"
MikamiUitOpen 0:0e5131366580 11
MikamiUitOpen 0:0e5131366580 12 namespace Mikami
MikamiUitOpen 0:0e5131366580 13 {
MikamiUitOpen 0:0e5131366580 14 class HammingWindow
MikamiUitOpen 0:0e5131366580 15 {
MikamiUitOpen 0:0e5131366580 16 public:
MikamiUitOpen 0:0e5131366580 17 // Constructor
MikamiUitOpen 0:0e5131366580 18 HammingWindow(uint16_t nData, uint16_t nFft)
MikamiUitOpen 0:0e5131366580 19 : N_(nData), NFFT_(nFft), w_(new float[nData])
MikamiUitOpen 0:0e5131366580 20 {
MikamiUitOpen 0:0e5131366580 21 float pi2L = 6.283185f/(float)nData;
MikamiUitOpen 0:0e5131366580 22 for (int k=0; k<nData; k++)
MikamiUitOpen 0:0e5131366580 23 w_[k] = 0.54f - 0.46f*cosf(k*pi2L);
MikamiUitOpen 0:0e5131366580 24 }
MikamiUitOpen 0:0e5131366580 25
MikamiUitOpen 0:0e5131366580 26 // Destructor
MikamiUitOpen 0:0e5131366580 27 ~HammingWindow() {delete[] w_;}
MikamiUitOpen 0:0e5131366580 28
MikamiUitOpen 0:0e5131366580 29 // Windowing
MikamiUitOpen 0:0e5131366580 30 void Execute(const float x[], float y[])
MikamiUitOpen 0:0e5131366580 31 {
MikamiUitOpen 0:0e5131366580 32 for (int n=0; n<N_; n++) y[n] = x[n]*w_[n];
MikamiUitOpen 0:0e5131366580 33 for (int n=N_; n<NFFT_; n++) y[n] = 0;
MikamiUitOpen 0:0e5131366580 34 }
MikamiUitOpen 0:0e5131366580 35
MikamiUitOpen 0:0e5131366580 36 private:
MikamiUitOpen 0:0e5131366580 37 const int N_;
MikamiUitOpen 0:0e5131366580 38 const int NFFT_;
MikamiUitOpen 0:0e5131366580 39
MikamiUitOpen 0:0e5131366580 40 float* w_;
MikamiUitOpen 0:0e5131366580 41
MikamiUitOpen 0:0e5131366580 42 // disallow copy constructor and assignment operator
MikamiUitOpen 0:0e5131366580 43 HammingWindow(const HammingWindow& );
MikamiUitOpen 0:0e5131366580 44 HammingWindow& operator=(const HammingWindow& );
MikamiUitOpen 0:0e5131366580 45 };
MikamiUitOpen 0:0e5131366580 46 }
MikamiUitOpen 0:0e5131366580 47 #endif // HAMMING_WINDOW_HPP