CQ出版社セミナ,2021/12/07開催「実習・C++言語によるArmマイコンのプログラミング」で使うプログラム.
Dependencies: Array_Matrix mbed SerialTxRxIntr UIT_FFT_Real
MyFFT_Analyzer/Hamming.hpp@5:5e55a5f440c0, 2020-04-02 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Thu Apr 02 01:12:34 2020 +0000
- Revision:
- 5:5e55a5f440c0
- Parent:
- 0:a80f730d32a8
6
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:a80f730d32a8 | 1 | //------------------------------------------------------------------- |
MikamiUitOpen | 0:a80f730d32a8 | 2 | // Hamming 窓による窓掛け |
MikamiUitOpen | 0:a80f730d32a8 | 3 | // ゼロ詰め(zero-padding)の機能を持つ |
MikamiUitOpen | 0:a80f730d32a8 | 4 | // |
MikamiUitOpen | 0:a80f730d32a8 | 5 | // 2019/11/14, Copyright (c) 2019 MIKAMI, Naoki |
MikamiUitOpen | 0:a80f730d32a8 | 6 | //------------------------------------------------------------------- |
MikamiUitOpen | 0:a80f730d32a8 | 7 | |
MikamiUitOpen | 0:a80f730d32a8 | 8 | #ifndef HAMMING_WINDOW_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 9 | #define HAMMING_WINDOW_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 10 | |
MikamiUitOpen | 0:a80f730d32a8 | 11 | #include "mbed.h" |
MikamiUitOpen | 0:a80f730d32a8 | 12 | #include "Array.hpp" |
MikamiUitOpen | 0:a80f730d32a8 | 13 | |
MikamiUitOpen | 0:a80f730d32a8 | 14 | namespace Mikami |
MikamiUitOpen | 0:a80f730d32a8 | 15 | { |
MikamiUitOpen | 0:a80f730d32a8 | 16 | class HammingWindow |
MikamiUitOpen | 0:a80f730d32a8 | 17 | { |
MikamiUitOpen | 0:a80f730d32a8 | 18 | public: |
MikamiUitOpen | 0:a80f730d32a8 | 19 | // コンストラクタ |
MikamiUitOpen | 0:a80f730d32a8 | 20 | HammingWindow(uint16_t nData, uint16_t nFft) |
MikamiUitOpen | 0:a80f730d32a8 | 21 | : N_(nData), NFFT_(nFft), w_(nData) |
MikamiUitOpen | 0:a80f730d32a8 | 22 | { |
MikamiUitOpen | 0:a80f730d32a8 | 23 | const float PI2L = 6.283185f/(float)nData; |
MikamiUitOpen | 0:a80f730d32a8 | 24 | for (int k=0; k<nData; k++) |
MikamiUitOpen | 0:a80f730d32a8 | 25 | w_[k] = 0.54f - 0.46f*cosf(k*PI2L); |
MikamiUitOpen | 0:a80f730d32a8 | 26 | } |
MikamiUitOpen | 0:a80f730d32a8 | 27 | |
MikamiUitOpen | 0:a80f730d32a8 | 28 | // デストラクタ |
MikamiUitOpen | 0:a80f730d32a8 | 29 | virtual ~HammingWindow() {} |
MikamiUitOpen | 0:a80f730d32a8 | 30 | |
MikamiUitOpen | 0:a80f730d32a8 | 31 | // 窓掛けを実行 |
MikamiUitOpen | 0:a80f730d32a8 | 32 | void Execute(const Array<float> &x, Array<float> &y) |
MikamiUitOpen | 0:a80f730d32a8 | 33 | { |
MikamiUitOpen | 0:a80f730d32a8 | 34 | for (int n=0; n<N_; n++) y[n] = x[n]*w_[n]; |
MikamiUitOpen | 0:a80f730d32a8 | 35 | for (int n=N_; n<NFFT_; n++) y[n] = 0; |
MikamiUitOpen | 0:a80f730d32a8 | 36 | } |
MikamiUitOpen | 0:a80f730d32a8 | 37 | |
MikamiUitOpen | 0:a80f730d32a8 | 38 | private: |
MikamiUitOpen | 0:a80f730d32a8 | 39 | const int N_; |
MikamiUitOpen | 0:a80f730d32a8 | 40 | const int NFFT_; |
MikamiUitOpen | 0:a80f730d32a8 | 41 | |
MikamiUitOpen | 0:a80f730d32a8 | 42 | Array<float> w_; |
MikamiUitOpen | 0:a80f730d32a8 | 43 | |
MikamiUitOpen | 0:a80f730d32a8 | 44 | // コピー・コンストラクタおよび代入演算子の禁止のため |
MikamiUitOpen | 0:a80f730d32a8 | 45 | HammingWindow(const HammingWindow& ); |
MikamiUitOpen | 0:a80f730d32a8 | 46 | HammingWindow& operator=(const HammingWindow& ); |
MikamiUitOpen | 0:a80f730d32a8 | 47 | }; |
MikamiUitOpen | 0:a80f730d32a8 | 48 | } |
MikamiUitOpen | 0:a80f730d32a8 | 49 | #endif // HAMMING_WINDOW_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 50 |