AnalyzerBase.hpp

00001 //-------------------------------------------------------
00002 //  Base abstract class for spectrum analysis (Header)
00003 //
00004 //  2018/11/04, Copyright (c) 2018 MIKAMI, Naoki
00005 //-------------------------------------------------------
00006 
00007 #ifndef BASE_ANALYZER_HPP
00008 #define BASE_ANALYZER_HPP
00009 
00010 #include "Array.hpp"
00011 #include "fftReal.hpp"
00012 #include "Hamming.hpp"
00013 
00014 namespace Mikami
00015 {
00016     class AnalyzerBase
00017     {
00018     public:
00019         // nData: Number of data to be analyzed
00020         // nFft:  Number of FFT points
00021         // nUse:  FFT, cepstrum: window width + zero padding
00022         //        Linear prediction: window width
00023         AnalyzerBase(int nData, int nFft, int nUse);
00024         virtual ~AnalyzerBase() {}
00025         void Execute(const float xn[], float db[]);
00026         // 高域強調の程度を決める定数の設定（b1 = 1 で差分，b1 = 0 で高域強調なし）
00027         void SetHighEmphasizer(float b1) { b1_ = b1; }
00028 
00029     protected:
00030         const int N_DATA_;
00031         const int N_FFT_;
00032 
00033         FftReal fft_;
00034                 
00035         float Norm(Complex x)
00036         { return x.real()*x.real() + x.imag()*x.imag(); }
00037 
00038     private:
00039         HammingWindow wHm_;
00040         float b1_;
00041 
00042         Array<float> xData_;    // data to be analyzed
00043         Array<float> wData_;    // windowd data
00044 
00045         virtual void Analyze(const float wData[], float db[]) = 0;
00046 
00047         // disallow copy constructor and assignment operator
00048         AnalyzerBase(const AnalyzerBase& );
00049         AnalyzerBase& operator=(const AnalyzerBase& );
00050     };
00051 }
00052 #endif  // BASE_ANALYZER_HPP