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/FFT_Analyzer.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 |
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MikamiUitOpen | 0:a80f730d32a8 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:a80f730d32a8 | 2 | // FFT を使ってスペクトル解析を行うクラス(ヘッダ) |
MikamiUitOpen | 0:a80f730d32a8 | 3 | // |
MikamiUitOpen | 0:a80f730d32a8 | 4 | // 2019/11/22, Copyright (c) 2019 MIKAMI, Naoki |
MikamiUitOpen | 0:a80f730d32a8 | 5 | //------------------------------------------------------- |
MikamiUitOpen | 0:a80f730d32a8 | 6 | |
MikamiUitOpen | 0:a80f730d32a8 | 7 | #ifndef FFT_ANALYZER_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 8 | #define FFT_ANALYZER_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 9 | |
MikamiUitOpen | 0:a80f730d32a8 | 10 | #include "Array.hpp" |
MikamiUitOpen | 0:a80f730d32a8 | 11 | #include "fftReal.hpp" |
MikamiUitOpen | 0:a80f730d32a8 | 12 | #include "Hamming.hpp" |
MikamiUitOpen | 0:a80f730d32a8 | 13 | |
MikamiUitOpen | 0:a80f730d32a8 | 14 | namespace Mikami |
MikamiUitOpen | 0:a80f730d32a8 | 15 | { |
MikamiUitOpen | 0:a80f730d32a8 | 16 | class FftAnalyzer |
MikamiUitOpen | 0:a80f730d32a8 | 17 | { |
MikamiUitOpen | 0:a80f730d32a8 | 18 | public: |
MikamiUitOpen | 0:a80f730d32a8 | 19 | // nFft: FFT のデータ点の数 |
MikamiUitOpen | 0:a80f730d32a8 | 20 | FftAnalyzer(int nFft); |
MikamiUitOpen | 0:a80f730d32a8 | 21 | virtual ~FftAnalyzer() {} |
MikamiUitOpen | 0:a80f730d32a8 | 22 | void Execute(const Array<float> &xn, Array<float> &db); |
MikamiUitOpen | 0:a80f730d32a8 | 23 | |
MikamiUitOpen | 0:a80f730d32a8 | 24 | private: |
MikamiUitOpen | 0:a80f730d32a8 | 25 | const int N_FFT_; |
MikamiUitOpen | 0:a80f730d32a8 | 26 | |
MikamiUitOpen | 0:a80f730d32a8 | 27 | FftReal fft_; |
MikamiUitOpen | 0:a80f730d32a8 | 28 | HammingWindow wHm_; |
MikamiUitOpen | 0:a80f730d32a8 | 29 | |
MikamiUitOpen | 0:a80f730d32a8 | 30 | Array<float> xData_; // 解析対象の時系列データ |
MikamiUitOpen | 0:a80f730d32a8 | 31 | Array<float> wData_; // 窓掛けされたデータ |
MikamiUitOpen | 0:a80f730d32a8 | 32 | Array<Complex> yFft_; // FFT の結果 |
MikamiUitOpen | 0:a80f730d32a8 | 33 | |
MikamiUitOpen | 0:a80f730d32a8 | 34 | // 絶対値の2乗 |
MikamiUitOpen | 0:a80f730d32a8 | 35 | float Norm(Complex x) |
MikamiUitOpen | 0:a80f730d32a8 | 36 | { return x.real()*x.real() + x.imag()*x.imag(); } |
MikamiUitOpen | 0:a80f730d32a8 | 37 | |
MikamiUitOpen | 0:a80f730d32a8 | 38 | // 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 | 39 | FftAnalyzer(const FftAnalyzer& ); |
MikamiUitOpen | 0:a80f730d32a8 | 40 | FftAnalyzer& operator=(const FftAnalyzer& ); |
MikamiUitOpen | 0:a80f730d32a8 | 41 | }; |
MikamiUitOpen | 0:a80f730d32a8 | 42 | } |
MikamiUitOpen | 0:a80f730d32a8 | 43 | #endif // FFT_ANALYZER_HPP |
MikamiUitOpen | 0:a80f730d32a8 | 44 |