不韋 呂 / F746_MySoundMachine

Integrated program of 4 different kinds of application programs for processing sound signal. 4種類のサウンド信号処理を統合したプログラム．

Dependencies:   F746_GUI F746_SAI_IO FrequencyResponseDrawer SD_PlayerSkeleton UIT_FFT_Real

MySpectrogram/Hamming.hpp@16:d60e5187fd31, 2017-04-27 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Apr 27 23:55:53 2017 +0000
Revision:
16:d60e5187fd31
Parent:
15:fac50dd1de44 
17

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 15:fac50dd1de44 1 //-------------------------------------------------------------------
MikamiUitOpen 15:fac50dd1de44 2 // Hamming windowing with zero-padding
MikamiUitOpen 15:fac50dd1de44 3 //
MikamiUitOpen 15:fac50dd1de44 4 // 2017/04/10, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 15:fac50dd1de44 5 //-------------------------------------------------------------------
MikamiUitOpen 15:fac50dd1de44 6
MikamiUitOpen 15:fac50dd1de44 7 #ifndef HAMMING_WINDOW_HPP
MikamiUitOpen 15:fac50dd1de44 8 #define HAMMING_WINDOW_HPP
MikamiUitOpen 15:fac50dd1de44 9
MikamiUitOpen 15:fac50dd1de44 10 #include "mbed.h"
MikamiUitOpen 15:fac50dd1de44 11 #include "Array.hpp"
MikamiUitOpen 15:fac50dd1de44 12
MikamiUitOpen 15:fac50dd1de44 13 namespace Mikami
MikamiUitOpen 15:fac50dd1de44 14 {
MikamiUitOpen 15:fac50dd1de44 15 class HammingWindow
MikamiUitOpen 15:fac50dd1de44 16 {
MikamiUitOpen 15:fac50dd1de44 17 public:
MikamiUitOpen 15:fac50dd1de44 18 // Constructor
MikamiUitOpen 15:fac50dd1de44 19 HammingWindow(uint16_t nData, uint16_t nFft)
MikamiUitOpen 15:fac50dd1de44 20 : N_(nData), NFFT_(nFft), w_(nData)
MikamiUitOpen 15:fac50dd1de44 21 {
MikamiUitOpen 15:fac50dd1de44 22 float pi2L = 6.283185f/(float)nData;
MikamiUitOpen 15:fac50dd1de44 23 for (int k=0; k<nData; k++)
MikamiUitOpen 15:fac50dd1de44 24 w_[k] = 0.54f - 0.46f*cosf(k*pi2L);
MikamiUitOpen 15:fac50dd1de44 25 }
MikamiUitOpen 15:fac50dd1de44 26
MikamiUitOpen 15:fac50dd1de44 27 // Windowing
MikamiUitOpen 15:fac50dd1de44 28 void Execute(const float x[], float y[])
MikamiUitOpen 15:fac50dd1de44 29 {
MikamiUitOpen 15:fac50dd1de44 30 for (int n=0; n<N_; n++) y[n] = x[n]*w_[n];
MikamiUitOpen 15:fac50dd1de44 31 for (int n=N_; n<NFFT_; n++) y[n] = 0;
MikamiUitOpen 15:fac50dd1de44 32 }
MikamiUitOpen 15:fac50dd1de44 33
MikamiUitOpen 15:fac50dd1de44 34 private:
MikamiUitOpen 15:fac50dd1de44 35 const int N_;
MikamiUitOpen 15:fac50dd1de44 36 const int NFFT_;
MikamiUitOpen 15:fac50dd1de44 37
MikamiUitOpen 15:fac50dd1de44 38 Array<float> w_;
MikamiUitOpen 15:fac50dd1de44 39
MikamiUitOpen 15:fac50dd1de44 40 // disallow copy constructor and assignment operator
MikamiUitOpen 15:fac50dd1de44 41 HammingWindow(const HammingWindow& );
MikamiUitOpen 15:fac50dd1de44 42 HammingWindow& operator=(const HammingWindow& );
MikamiUitOpen 15:fac50dd1de44 43 };
MikamiUitOpen 15:fac50dd1de44 44 }
MikamiUitOpen 15:fac50dd1de44 45 #endif // HAMMING_WINDOW_HPP