Version using MEMS microphone and CODEC for the program "F746_RealtimeSpectrumAnalyzer". "F746_RealtimeSpectrumAnalyzer" の入力を MEMS のマイクと CODEC に変更.このプログラムは Tomona Nanase さんが作成し DISCO-F746NG_Oscilloscope の名前で登録しているプログラムで, CODEC を使って入力する部分を参考にして作成.このプログラムの説明は,CQ出版社のインターフェース誌,2016年4月号に掲載.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
MyClasses_Functions/FFT_Analysis.cpp@8:e7dc8658c5cd, 2016-04-19 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Tue Apr 19 09:35:24 2016 +0000
- Revision:
- 8:e7dc8658c5cd
- Parent:
- 0:0e5131366580
9
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:0e5131366580 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:0e5131366580 | 2 | // Class for spectrum analysis using FFT |
MikamiUitOpen | 0:0e5131366580 | 3 | // |
MikamiUitOpen | 0:0e5131366580 | 4 | // 2015/12/15, Copyright (c) 2015 MIKAMI, Naoki |
MikamiUitOpen | 0:0e5131366580 | 5 | //------------------------------------------------------- |
MikamiUitOpen | 0:0e5131366580 | 6 | |
MikamiUitOpen | 0:0e5131366580 | 7 | #include "FFT_Analysis.hpp" |
MikamiUitOpen | 0:0e5131366580 | 8 | |
MikamiUitOpen | 0:0e5131366580 | 9 | namespace Mikami |
MikamiUitOpen | 0:0e5131366580 | 10 | { |
MikamiUitOpen | 0:0e5131366580 | 11 | FftAnalyzer::FftAnalyzer(int nData, int nFft) |
MikamiUitOpen | 0:0e5131366580 | 12 | : AnalyzerBase(nData, nFft, nFft), |
MikamiUitOpen | 0:0e5131366580 | 13 | yFft_(new Complex[nFft/2+1]) {} |
MikamiUitOpen | 0:0e5131366580 | 14 | |
MikamiUitOpen | 0:0e5131366580 | 15 | FftAnalyzer::~FftAnalyzer() |
MikamiUitOpen | 0:0e5131366580 | 16 | { |
MikamiUitOpen | 0:0e5131366580 | 17 | delete[] yFft_; |
MikamiUitOpen | 0:0e5131366580 | 18 | } |
MikamiUitOpen | 0:0e5131366580 | 19 | |
MikamiUitOpen | 0:0e5131366580 | 20 | void FftAnalyzer::Analyze(const float xn[], float yn[]) |
MikamiUitOpen | 0:0e5131366580 | 21 | { |
MikamiUitOpen | 0:0e5131366580 | 22 | fft_.Execute(xn, yFft_); // Execute FFT |
MikamiUitOpen | 0:0e5131366580 | 23 | |
MikamiUitOpen | 0:0e5131366580 | 24 | // Translate to dB |
MikamiUitOpen | 0:0e5131366580 | 25 | for (int n=0; n<=N_FFT_/2; n++) |
MikamiUitOpen | 0:0e5131366580 | 26 | yn[n] = 10.0f*log10f(Norm(yFft_[n])); |
MikamiUitOpen | 0:0e5131366580 | 27 | } |
MikamiUitOpen | 0:0e5131366580 | 28 | } |