不韋 呂 / F746_Spectrogram

Realtime spectrogram for DISCO-F746NG. On-board MEMS microphone is used for input sound signal. リアルタイムスペクトログラム．入力：MEMSマイク

Dependencies:   F746_GUI F746_SAI_IO UIT_FFT_Real

MySpectrogram/AnalysisBase.hpp

Committer:
MikamiUitOpen
Date:
2016-08-15
Revision:
3:6a2c8ff46f73
Parent:
MyClasses_Functions/AnalysisBase.hpp@ 2:1f092ac020e1
Child:
6:b3885567877c

File content as of revision 3:6a2c8ff46f73:

//-------------------------------------------------------
//  Base abstract class for spectrum analysis (Header)
//
//  2016/07/23, Copyright (c) 2016 MIKAMI, Naoki
//-------------------------------------------------------

#ifndef BASE_ANALYZER_HPP
#define BASE_ANALYZER_HPP

#include "Array.hpp"
#include "fftReal.hpp"
#include "Hamming.hpp"

namespace Mikami
{
    class AnalyzerBase
    {
    public:
        // nData: Number of data to be analyzed
        // nFft:  Number of FFT points
        // nUse:  FFT, cepstrum: window width + zero padding
        //        Linear prediction: window width
        AnalyzerBase(int nData, int nFft, int nUse);
        virtual ~AnalyzerBase() {}
        void Execute(const float xn[], float db[]);

    protected:
        const int N_DATA_;
        const int N_FFT_;

        FftReal fft_;
                
        float Norm(Complex x)
        { return x.real()*x.real() + x.imag()*x.imag(); }

    private:
        HammingWindow wHm_;

        Array<float> xData_;    // data to be analyzed
        Array<float> wData_;    // windowd data

        virtual void Analyze(const float wData[], float db[]) = 0;

        // disallow copy constructor and assignment operator
        AnalyzerBase(const AnalyzerBase& );
        AnalyzerBase& operator=(const AnalyzerBase& );
    };
}
#endif  // BASE_ANALYZER_HPP