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@3:7c26b701f363, 2015-12-14 (annotated)
- Committer:
- MikamiUitOpen
- Date:
- Mon Dec 14 13:44:42 2015 +0000
- Revision:
- 3:7c26b701f363
- Parent:
- 0:5c237fdcba23
- Child:
- 4:99d4d5ea06a2
4
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
MikamiUitOpen | 0:5c237fdcba23 | 1 | //------------------------------------------------------- |
MikamiUitOpen | 0:5c237fdcba23 | 2 | // Base class for spectrum analysis (Header) |
MikamiUitOpen | 0:5c237fdcba23 | 3 | // |
MikamiUitOpen | 3:7c26b701f363 | 4 | // 2015/12/14, 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 | 3:7c26b701f363 | 18 | // nData: Number of data to be analyzed |
MikamiUitOpen | 3:7c26b701f363 | 19 | // nFft: Number of FFT points |
MikamiUitOpen | 3:7c26b701f363 | 20 | // nUse: FFT, cepstrum: window width + zero padding |
MikamiUitOpen | 3:7c26b701f363 | 21 | // Linear prediction: window width |
MikamiUitOpen | 3:7c26b701f363 | 22 | AnalyzerBase(int nData, int nFft, int nUse); |
MikamiUitOpen | 0:5c237fdcba23 | 23 | virtual ~AnalyzerBase(); |
MikamiUitOpen | 0:5c237fdcba23 | 24 | void Execute(const float xn[], float db[]); |
MikamiUitOpen | 0:5c237fdcba23 | 25 | |
MikamiUitOpen | 0:5c237fdcba23 | 26 | protected: |
MikamiUitOpen | 0:5c237fdcba23 | 27 | const int N_DATA_; |
MikamiUitOpen | 0:5c237fdcba23 | 28 | const int N_FFT_; |
MikamiUitOpen | 0:5c237fdcba23 | 29 | |
MikamiUitOpen | 0:5c237fdcba23 | 30 | FftReal fft_; |
MikamiUitOpen | 3:7c26b701f363 | 31 | HammingWindow wHm_; |
MikamiUitOpen | 0:5c237fdcba23 | 32 | |
MikamiUitOpen | 0:5c237fdcba23 | 33 | float Norm(Complex x) |
MikamiUitOpen | 0:5c237fdcba23 | 34 | { return x.real()*x.real() + x.imag()*x.imag(); } |
MikamiUitOpen | 0:5c237fdcba23 | 35 | |
MikamiUitOpen | 0:5c237fdcba23 | 36 | private: |
MikamiUitOpen | 0:5c237fdcba23 | 37 | float* xData_; // data to be analyzed |
MikamiUitOpen | 0:5c237fdcba23 | 38 | |
MikamiUitOpen | 0:5c237fdcba23 | 39 | virtual void Analyze(const float xn[], float yn[]) = 0; |
MikamiUitOpen | 0:5c237fdcba23 | 40 | }; |
MikamiUitOpen | 0:5c237fdcba23 | 41 | } |
MikamiUitOpen | 0:5c237fdcba23 | 42 | #endif // BASE_ANALYZER_HPP |
MikamiUitOpen | 3:7c26b701f363 | 43 |