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/FFT_Analysis.cpp@2:1f092ac020e1, 2016-07-23 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Sat Jul 23 13:34:54 2016 +0000
- Revision:
- 2:1f092ac020e1
- Parent:
- 0:9470a174c910
3
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:9470a174c910 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:9470a174c910 | 2 | // Class for spectrum analysis using FFT |
MikamiUitOpen | 0:9470a174c910 | 3 | // |
MikamiUitOpen | 2:1f092ac020e1 | 4 | // 2016/07/23, Copyright (c) 2015 MIKAMI, Naoki |
MikamiUitOpen | 0:9470a174c910 | 5 | //------------------------------------------------------- |
MikamiUitOpen | 0:9470a174c910 | 6 | |
MikamiUitOpen | 0:9470a174c910 | 7 | #include "FFT_Analysis.hpp" |
MikamiUitOpen | 0:9470a174c910 | 8 | |
MikamiUitOpen | 0:9470a174c910 | 9 | namespace Mikami |
MikamiUitOpen | 0:9470a174c910 | 10 | { |
MikamiUitOpen | 0:9470a174c910 | 11 | FftAnalyzer::FftAnalyzer(int nData, int nFft) |
MikamiUitOpen | 0:9470a174c910 | 12 | : AnalyzerBase(nData, nFft, nFft), |
MikamiUitOpen | 2:1f092ac020e1 | 13 | yFft_(nFft/2+1) {} |
MikamiUitOpen | 0:9470a174c910 | 14 | |
MikamiUitOpen | 0:9470a174c910 | 15 | void FftAnalyzer::Analyze(const float xn[], float yn[]) |
MikamiUitOpen | 0:9470a174c910 | 16 | { |
MikamiUitOpen | 0:9470a174c910 | 17 | fft_.Execute(xn, yFft_); // Execute FFT |
MikamiUitOpen | 0:9470a174c910 | 18 | |
MikamiUitOpen | 0:9470a174c910 | 19 | // Translate to dB |
MikamiUitOpen | 0:9470a174c910 | 20 | for (int n=0; n<=N_FFT_/2; n++) |
MikamiUitOpen | 0:9470a174c910 | 21 | yn[n] = 10.0f*log10f(Norm(yFft_[n])); |
MikamiUitOpen | 0:9470a174c910 | 22 | } |
MikamiUitOpen | 0:9470a174c910 | 23 | } |