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

MyClasses_Functions/AnalysisBase.cpp

Committer:
MikamiUitOpen
Date:
2016-05-22
Revision:
0:9470a174c910
Child:
2:1f092ac020e1

File content as of revision 0:9470a174c910:

//-------------------------------------------------------
//  Base class for spectrum analysis
//
//  2016/05/14, Copyright (c) 2015 MIKAMI, Naoki
//-------------------------------------------------------

#include "AnalysisBase.hpp"

namespace Mikami
{
    AnalyzerBase::AnalyzerBase(int nData, int nFft, int nUse)
        : N_DATA_(nData), N_FFT_(nFft),
          fft_(nFft), wHm_(nData-1, nUse),
          xData_(new float[nUse]), wData_(new float[nUse]) {}

    AnalyzerBase::~AnalyzerBase()
    {
        delete[] xData_;
    }

    void AnalyzerBase::Execute(const float xn[], float db[])
    {
        // Differencing
        for (int n=0; n<N_DATA_-1; n++)
            xData_[n] = xn[n+1] - 0.8f*xn[n];
            
        // Windowing (FFT, cepstrum: + zero-padding)
        wHm_.Execute(xData_, wData_);
            
        // Pure virtual function for analyzing
        Analyze(wData_, db);
    }
}