Realtime spectrum analyzer. Using FFT, linear prediction, or cepstrum smoothing. Version using MEMS microphone and CODEC, named "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" is registered. リアルタイム スペクトル解析器.解析の手法:FFT,線形予測法,ケプストラムによる平滑化の3種類.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.外付けのマイクまたは他の信号源等を A0 に接続する.線形予測法,ケプストラムは,スペクトル解析の対象を音声信号に想定してパラメータを設定している.MEMS マイクと CODEC を使ったバージョンを "F746_RealtimeSpectrumAnalyzer_MEMS_Mic" として登録.
Dependencies: BSP_DISCO_F746NG BUTTON_GROUP LCD_DISCO_F746NG TS_DISCO_F746NG UIT_FFT_Real mbed
MyClasses/AnalysisBase.hpp@0:5c237fdcba23, 2015-12-09 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Wed Dec 09 05:05:00 2015 +0000
- Revision:
- 0:5c237fdcba23
- Child:
- 3:7c26b701f363
1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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MikamiUitOpen | 0:5c237fdcba23 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:5c237fdcba23 | 2 | // Base class for spectrum analysis (Header) |
MikamiUitOpen | 0:5c237fdcba23 | 3 | // |
MikamiUitOpen | 0:5c237fdcba23 | 4 | // 2015/12/08, Copyright (c) 2015 MIKAMI, Naoki |
MikamiUitOpen | 0:5c237fdcba23 | 5 | //------------------------------------------------------- |
MikamiUitOpen | 0:5c237fdcba23 | 6 | |
MikamiUitOpen | 0:5c237fdcba23 | 7 | #ifndef BASE_ANALYZER_HPP |
MikamiUitOpen | 0:5c237fdcba23 | 8 | #define BASE_ANALYZER_HPP |
MikamiUitOpen | 0:5c237fdcba23 | 9 | |
MikamiUitOpen | 0:5c237fdcba23 | 10 | #include "fftReal.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 11 | #include "Hamming.hpp" |
MikamiUitOpen | 0:5c237fdcba23 | 12 | |
MikamiUitOpen | 0:5c237fdcba23 | 13 | namespace Mikami |
MikamiUitOpen | 0:5c237fdcba23 | 14 | { |
MikamiUitOpen | 0:5c237fdcba23 | 15 | class AnalyzerBase |
MikamiUitOpen | 0:5c237fdcba23 | 16 | { |
MikamiUitOpen | 0:5c237fdcba23 | 17 | public: |
MikamiUitOpen | 0:5c237fdcba23 | 18 | AnalyzerBase(int nData, int nFft); |
MikamiUitOpen | 0:5c237fdcba23 | 19 | virtual ~AnalyzerBase(); |
MikamiUitOpen | 0:5c237fdcba23 | 20 | void Execute(const float xn[], float db[]); |
MikamiUitOpen | 0:5c237fdcba23 | 21 | |
MikamiUitOpen | 0:5c237fdcba23 | 22 | protected: |
MikamiUitOpen | 0:5c237fdcba23 | 23 | const int N_DATA_; |
MikamiUitOpen | 0:5c237fdcba23 | 24 | const int N_FFT_; |
MikamiUitOpen | 0:5c237fdcba23 | 25 | |
MikamiUitOpen | 0:5c237fdcba23 | 26 | FftReal fft_; |
MikamiUitOpen | 0:5c237fdcba23 | 27 | |
MikamiUitOpen | 0:5c237fdcba23 | 28 | float Norm(Complex x) |
MikamiUitOpen | 0:5c237fdcba23 | 29 | { return x.real()*x.real() + x.imag()*x.imag(); } |
MikamiUitOpen | 0:5c237fdcba23 | 30 | |
MikamiUitOpen | 0:5c237fdcba23 | 31 | private: |
MikamiUitOpen | 0:5c237fdcba23 | 32 | float* xData_; // data to be analyzed |
MikamiUitOpen | 0:5c237fdcba23 | 33 | |
MikamiUitOpen | 0:5c237fdcba23 | 34 | virtual void Analyze(const float xn[], float yn[]) = 0; |
MikamiUitOpen | 0:5c237fdcba23 | 35 | }; |
MikamiUitOpen | 0:5c237fdcba23 | 36 | } |
MikamiUitOpen | 0:5c237fdcba23 | 37 | #endif // BASE_ANALYZER_HPP |