AnalysisBase.hpp

00001 //-------------------------------------------------------
00002 //  Base abstract class for spectrum analysis (Header)
00003 //
00004 //  2017/03/30, Copyright (c) 2017 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 
00027     protected:
00028         const int N_DATA_;
00029         const int N_FFT_;
00030 
00031         FftReal fft_;
00032                 
00033         float Norm(Complex x)
00034         { return x.real()*x.real() + x.imag()*x.imag(); }
00035 
00036     private:
00037         HammingWindow wHm_;
00038 
00039         Array<float> xData_;    // data to be analyzed
00040         Array<float> wData_;    // windowd data
00041 
00042         virtual void Analyze(const float wData[], float db[]) = 0;
00043 
00044         // disallow copy constructor and assignment operator
00045         AnalyzerBase(const AnalyzerBase& );
00046         AnalyzerBase& operator=(const AnalyzerBase& );
00047     };
00048 }
00049 #endif  // BASE_ANALYZER_HPP
00050