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.cpp@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
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 #include "AnalysisBase.hpp"
MikamiUitOpen 0:5c237fdcba23 8
MikamiUitOpen 0:5c237fdcba23 9 namespace Mikami
MikamiUitOpen 0:5c237fdcba23 10 {
MikamiUitOpen 3:7c26b701f363 11 AnalyzerBase::AnalyzerBase(int nData, int nFft, int nUse)
MikamiUitOpen 3:7c26b701f363 12 : N_DATA_(nData), N_FFT_(nFft),
MikamiUitOpen 3:7c26b701f363 13 fft_(nFft), wHm_(nData-1, nUse),
MikamiUitOpen 4:99d4d5ea06a2 14 xData_(new float[nUse]), wData_(new float[nUse]) {}
MikamiUitOpen 0:5c237fdcba23 15
MikamiUitOpen 0:5c237fdcba23 16 AnalyzerBase::~AnalyzerBase()
MikamiUitOpen 0:5c237fdcba23 17 {
MikamiUitOpen 0:5c237fdcba23 18 delete[] xData_;
MikamiUitOpen 0:5c237fdcba23 19 }
MikamiUitOpen 0:5c237fdcba23 20
MikamiUitOpen 0:5c237fdcba23 21 void AnalyzerBase::Execute(const float xn[], float db[])
MikamiUitOpen 0:5c237fdcba23 22 {
MikamiUitOpen 0:5c237fdcba23 23 // Differencing
MikamiUitOpen 0:5c237fdcba23 24 for (int n=0; n<N_DATA_-1; n++)
MikamiUitOpen 0:5c237fdcba23 25 xData_[n] = xn[n+1] - xn[n];
MikamiUitOpen 0:5c237fdcba23 26
MikamiUitOpen 4:99d4d5ea06a2 27 // Windowing (FFT, cepstrum: + zero-padding)
MikamiUitOpen 4:99d4d5ea06a2 28 wHm_.Execute(xData_, wData_);
MikamiUitOpen 4:99d4d5ea06a2 29
MikamiUitOpen 4:99d4d5ea06a2 30 // Pure virtual function for analyzing
MikamiUitOpen 4:99d4d5ea06a2 31 Analyze(wData_, db);
MikamiUitOpen 0:5c237fdcba23 32 }
MikamiUitOpen 0:5c237fdcba23 33 }
MikamiUitOpen 3:7c26b701f363 34