不韋 呂 / F746_MySoundMachine

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Dependencies:   F746_GUI F746_SAI_IO FrequencyResponseDrawer SD_PlayerSkeleton UIT_FFT_Real

MySpectrogram/FFT_Analysis.cpp@0:224dccbc4edd, 2016-08-15 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Aug 15 07:18:07 2016 +0000
Revision:
0:224dccbc4edd
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:224dccbc4edd 1 //-------------------------------------------------------
MikamiUitOpen 0:224dccbc4edd 2 // Class for spectrum analysis using FFT
MikamiUitOpen 0:224dccbc4edd 3 //
MikamiUitOpen 0:224dccbc4edd 4 // 2016/07/23, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:224dccbc4edd 5 //-------------------------------------------------------
MikamiUitOpen 0:224dccbc4edd 6
MikamiUitOpen 0:224dccbc4edd 7 #include "FFT_Analysis.hpp"
MikamiUitOpen 0:224dccbc4edd 8
MikamiUitOpen 0:224dccbc4edd 9 namespace Mikami
MikamiUitOpen 0:224dccbc4edd 10 {
MikamiUitOpen 0:224dccbc4edd 11 FftAnalyzer::FftAnalyzer(int nData, int nFft)
MikamiUitOpen 0:224dccbc4edd 12 : AnalyzerBase(nData, nFft, nFft),
MikamiUitOpen 0:224dccbc4edd 13 yFft_(nFft/2+1) {}
MikamiUitOpen 0:224dccbc4edd 14
MikamiUitOpen 0:224dccbc4edd 15 void FftAnalyzer::Analyze(const float xn[], float yn[])
MikamiUitOpen 0:224dccbc4edd 16 {
MikamiUitOpen 0:224dccbc4edd 17 fft_.Execute(xn, yFft_); // Execute FFT
MikamiUitOpen 0:224dccbc4edd 18
MikamiUitOpen 0:224dccbc4edd 19 // Translate to dB
MikamiUitOpen 0:224dccbc4edd 20 for (int n=0; n<=N_FFT_/2; n++)
MikamiUitOpen 0:224dccbc4edd 21 yn[n] = 10.0f*log10f(Norm(yFft_[n]));
MikamiUitOpen 0:224dccbc4edd 22 }
MikamiUitOpen 0:224dccbc4edd 23 }