不韋 呂 / Mbed 2 deprecated F746_SpectralAnalysis_NoPhoto

No photo version of "F746_SpectralAnalysis_Example".

Dependencies:   BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed

SpactrumAnalysisClasses/Hamming.hpp@0:9d7f931c704a, 2015-11-24 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Nov 24 12:34:55 2015 +0000
Revision:
0:9d7f931c704a
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:9d7f931c704a 1 //-------------------------------------------------------------------
MikamiUitOpen 0:9d7f931c704a 2 // Hamming windowing with zero-padding
MikamiUitOpen 0:9d7f931c704a 3 // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/21
MikamiUitOpen 0:9d7f931c704a 4 //-------------------------------------------------------------------
MikamiUitOpen 0:9d7f931c704a 5
MikamiUitOpen 0:9d7f931c704a 6 #ifndef HAMMING_WINDOW_HPP
MikamiUitOpen 0:9d7f931c704a 7 #define HAMMING_WINDOW_HPP
MikamiUitOpen 0:9d7f931c704a 8
MikamiUitOpen 0:9d7f931c704a 9 #include "mbed.h"
MikamiUitOpen 0:9d7f931c704a 10
MikamiUitOpen 0:9d7f931c704a 11 namespace Mikami
MikamiUitOpen 0:9d7f931c704a 12 {
MikamiUitOpen 0:9d7f931c704a 13 class HammingWindow
MikamiUitOpen 0:9d7f931c704a 14 {
MikamiUitOpen 0:9d7f931c704a 15 private:
MikamiUitOpen 0:9d7f931c704a 16 const int N_;
MikamiUitOpen 0:9d7f931c704a 17 const int NFFT_;
MikamiUitOpen 0:9d7f931c704a 18
MikamiUitOpen 0:9d7f931c704a 19 float* w_;
MikamiUitOpen 0:9d7f931c704a 20
MikamiUitOpen 0:9d7f931c704a 21 public:
MikamiUitOpen 0:9d7f931c704a 22 // Constructor
MikamiUitOpen 0:9d7f931c704a 23 HammingWindow(uint16_t nData, uint16_t nFft)
MikamiUitOpen 0:9d7f931c704a 24 : N_(nData), NFFT_(nFft)
MikamiUitOpen 0:9d7f931c704a 25 {
MikamiUitOpen 0:9d7f931c704a 26 w_ = new float[nData];
MikamiUitOpen 0:9d7f931c704a 27 float pi2L = 6.283185f/(float)nData;
MikamiUitOpen 0:9d7f931c704a 28 for (int k=0; k<nData; k++)
MikamiUitOpen 0:9d7f931c704a 29 w_[k] = 0.54f - 0.46f*cosf(k*pi2L);
MikamiUitOpen 0:9d7f931c704a 30 }
MikamiUitOpen 0:9d7f931c704a 31
MikamiUitOpen 0:9d7f931c704a 32 // Destructor
MikamiUitOpen 0:9d7f931c704a 33 ~HammingWindow() {delete[] w_;}
MikamiUitOpen 0:9d7f931c704a 34
MikamiUitOpen 0:9d7f931c704a 35 // Windowing
MikamiUitOpen 0:9d7f931c704a 36 void Execute(const float x[], float y[])
MikamiUitOpen 0:9d7f931c704a 37 {
MikamiUitOpen 0:9d7f931c704a 38 for (int n=0; n<N_; n++) y[n] = x[n]*w_[n];
MikamiUitOpen 0:9d7f931c704a 39 for (int n=N_; n<NFFT_; n++) y[n] = 0;
MikamiUitOpen 0:9d7f931c704a 40 }
MikamiUitOpen 0:9d7f931c704a 41 };
MikamiUitOpen 0:9d7f931c704a 42 }
MikamiUitOpen 0:9d7f931c704a 43 #endif // HAMMING_WINDOW_HPP
MikamiUitOpen 0:9d7f931c704a 44