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/CepstrumAnalysis.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?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:5c237fdcba23 1 //-------------------------------------------------------
MikamiUitOpen 0:5c237fdcba23 2 // Class for spectrum analysis using cepstrum (Header)
MikamiUitOpen 0:5c237fdcba23 3 //
MikamiUitOpen 0:5c237fdcba23 4 // 2015/12/09, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:5c237fdcba23 5 //-------------------------------------------------------
MikamiUitOpen 0:5c237fdcba23 6
MikamiUitOpen 0:5c237fdcba23 7 #ifndef CEPSTRUM_ANALYZER_HPP
MikamiUitOpen 0:5c237fdcba23 8 #define CEPSTRUM_ANALYZER_HPP
MikamiUitOpen 0:5c237fdcba23 9
MikamiUitOpen 0:5c237fdcba23 10 #include "AnalysisBase.hpp"
MikamiUitOpen 0:5c237fdcba23 11
MikamiUitOpen 0:5c237fdcba23 12
MikamiUitOpen 0:5c237fdcba23 13 namespace Mikami
MikamiUitOpen 0:5c237fdcba23 14 {
MikamiUitOpen 0:5c237fdcba23 15 class CepstrumAnalyzer : public AnalyzerBase
MikamiUitOpen 0:5c237fdcba23 16 {
MikamiUitOpen 0:5c237fdcba23 17 public:
MikamiUitOpen 0:5c237fdcba23 18 CepstrumAnalyzer(int nData, int nFft, int nLifter);
MikamiUitOpen 0:5c237fdcba23 19 virtual ~CepstrumAnalyzer();
MikamiUitOpen 0:5c237fdcba23 20
MikamiUitOpen 0:5c237fdcba23 21 private:
MikamiUitOpen 0:5c237fdcba23 22 const int N_LIFTER_;
MikamiUitOpen 0:5c237fdcba23 23
MikamiUitOpen 0:5c237fdcba23 24 HammingWindow wHm_;
MikamiUitOpen 0:5c237fdcba23 25
MikamiUitOpen 0:5c237fdcba23 26 float* xFft_; // input for FFT
MikamiUitOpen 0:5c237fdcba23 27 Complex* yFft_; // output of FFT
MikamiUitOpen 0:5c237fdcba23 28 float* lifter_; // lifter
MikamiUitOpen 0:5c237fdcba23 29 float* db_; // log spectrun
MikamiUitOpen 0:5c237fdcba23 30 Complex* cDb_; // data for IFFT of log spectrum
MikamiUitOpen 0:5c237fdcba23 31 float* cep_; // cepstrum
MikamiUitOpen 0:5c237fdcba23 32 float* cepLft_; // liftered cepstrum
MikamiUitOpen 0:5c237fdcba23 33 Complex* cepFt_; // smoothed spectrum
MikamiUitOpen 0:5c237fdcba23 34
MikamiUitOpen 0:5c237fdcba23 35 virtual void Analyze(const float xn[], float yn[]);
MikamiUitOpen 0:5c237fdcba23 36 };
MikamiUitOpen 0:5c237fdcba23 37 }
MikamiUitOpen 0:5c237fdcba23 38
MikamiUitOpen 0:5c237fdcba23 39 #endif // CEPSTRUM_ANALYZER_HPP
MikamiUitOpen 0:5c237fdcba23 40
MikamiUitOpen 0:5c237fdcba23 41