不韋 呂 / F746_Spectrogram

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Dependencies:   F746_GUI F746_SAI_IO UIT_FFT_Real

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Show/hide line numbers FFT_Analysis.cpp Source File

FFT_Analysis.cpp

00001 //-------------------------------------------------------
00002 //  Class for spectrum analysis using FFT
00003 //
00004 //  2017/03/30, Copyright (c) 2017 MIKAMI, Naoki
00005 //-------------------------------------------------------
00006 
00007 #include "FFT_Analysis.hpp"
00008 
00009 namespace Mikami
00010 {
00011     FftAnalyzer::FftAnalyzer(int nData, int nFft)
00012         : AnalyzerBase(nData, nFft, nFft),
00013           yFft_(nFft/2+1) {}
00014 
00015     void FftAnalyzer::Analyze(const float xn[], float yn[])
00016     {
00017         fft_.Execute(xn, yFft_);    // Execute FFT
00018         
00019         // Translate to dB
00020         for (int n=0; n<=N_FFT_/2; n++)
00021             yn[n] = 10.0f*log10f(Norm(yFft_[n]));
00022     }
00023 }
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