不韋 呂 / Mbed 2 deprecated F746_RealtimeSpectrumAnalyzer

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@18:6630d61aeb3c, 2016-02-22 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Feb 22 13:54:51 2016 +0000
Revision:
18:6630d61aeb3c
Parent:
4:99d4d5ea06a2 
19

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:5c237fdcba23 1 //-------------------------------------------------------
MikamiUitOpen 0:5c237fdcba23 2 // Base class for spectrum analysis (Header)
MikamiUitOpen 0:5c237fdcba23 3 //
MikamiUitOpen 4:99d4d5ea06a2 4 // 2015/12/15, 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 0:5c237fdcba23 31
MikamiUitOpen 0:5c237fdcba23 32 float Norm(Complex x)
MikamiUitOpen 0:5c237fdcba23 33 { return x.real()*x.real() + x.imag()*x.imag(); }
MikamiUitOpen 0:5c237fdcba23 34
MikamiUitOpen 0:5c237fdcba23 35 private:
MikamiUitOpen 4:99d4d5ea06a2 36 HammingWindow wHm_;
MikamiUitOpen 4:99d4d5ea06a2 37
MikamiUitOpen 0:5c237fdcba23 38 float* xData_; // data to be analyzed
MikamiUitOpen 4:99d4d5ea06a2 39 float* wData_; // windowd data
MikamiUitOpen 0:5c237fdcba23 40
MikamiUitOpen 4:99d4d5ea06a2 41 virtual void Analyze(const float wData[], float db[]) = 0;
MikamiUitOpen 4:99d4d5ea06a2 42
MikamiUitOpen 4:99d4d5ea06a2 43 // disallow copy constructor and assignment operator
MikamiUitOpen 4:99d4d5ea06a2 44 AnalyzerBase(const AnalyzerBase& );
MikamiUitOpen 4:99d4d5ea06a2 45 AnalyzerBase& operator=(const AnalyzerBase& );
MikamiUitOpen 0:5c237fdcba23 46 };
MikamiUitOpen 0:5c237fdcba23 47 }
MikamiUitOpen 0:5c237fdcba23 48 #endif // BASE_ANALYZER_HPP
MikamiUitOpen 3:7c26b701f363 49