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
Diff: MyClasses/AnalysisSelector.hpp
- Revision:
- 0:5c237fdcba23
- Child:
- 4:99d4d5ea06a2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MyClasses/AnalysisSelector.hpp Wed Dec 09 05:05:00 2015 +0000 @@ -0,0 +1,60 @@ +//------------------------------------------------------- +// Class for selecting spectrum analysis method and +// displaying +// +// 2015/12/09, Copyright (c) 2015 MIKAMI, Naoki +//------------------------------------------------------- + +#include "SpectrumDisplay.hpp" +#include "FFT_Analysis.hpp" +#include "LPC_Analysis.hpp" +#include "CepstrumAnalysis.hpp" +using namespace Mikami; + +namespace Mikami +{ + class Selector + { + private: + SpectrumDisplay& disp_; + ButtonGroup& method_; + AnalyzerBase* obj_[3]; + + const int N_DATA_; + const uint32_t TOUCHED_COLOR_; + + float* sn_f_; + float* dbData_; + + public: + Selector(SpectrumDisplay& disp, ButtonGroup& method, + int nData, int nFft, int order, int nLifter, + uint32_t touchedColor) + : disp_(disp), method_(method), N_DATA_(nData), + TOUCHED_COLOR_(touchedColor), + sn_f_(new float[nData]), dbData_(new float[nFft/2+1]) + { + obj_[0] = new FftAnalyzer(nData, nFft); + obj_[1] = new LpcAnalyzer(nData, nFft, order); + obj_[2] = new CepstrumAnalyzer(nData, nFft, nLifter); + } + + ~Selector() + { + delete[] sn_f_; + delete[] dbData_; + for (int n=0; n<3; n++) delete obj_[n]; + } + + void Execute(const int16_t sn[], int& touchedNum) + { + method_.GetTouchedNumber(touchedNum, TOUCHED_COLOR_); + if (touchedNum >=0) + { + for (int n=0; n<N_DATA_; n++) sn_f_[n] = sn[n]; + obj_[touchedNum]->Execute(sn_f_, dbData_); + disp_.Draw(dbData_); + } + } + }; +}