不韋 呂 / Mbed 2 deprecated F446_Spectrogram

Realtime sound spectrogram using FFT or linear prediction. Spectrogram is displayed on the display of PC. リアルタイム･スペクトログラム．解析の手法：FFT，線形予測法．スペクトログラムは PC のディスプレー装置に表示される．PC 側のプログラム：F446_Spectrogram.

Dependencies:   Array_Matrix mbed SerialTxRxIntr F446_AD_DA UIT_FFT_Real

MySpectrogram/AnalyzerBase.cpp@7:5ba884060d3b, 2019-11-24 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Nov 24 11:14:01 2019 +0000
Revision:
7:5ba884060d3b
Parent:
6:c38ec7939609 
8

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:a539141b9dec 1 //-------------------------------------------------------
MikamiUitOpen 0:a539141b9dec 2 // Base abstract class for spectrum analysis
MikamiUitOpen 0:a539141b9dec 3 //
MikamiUitOpen 6:c38ec7939609 4 // 2018/11/04, Copyright (c) 2018 MIKAMI, Naoki
MikamiUitOpen 0:a539141b9dec 5 //-------------------------------------------------------
MikamiUitOpen 0:a539141b9dec 6
MikamiUitOpen 0:a539141b9dec 7 #include "AnalyzerBase.hpp"
MikamiUitOpen 0:a539141b9dec 8
MikamiUitOpen 0:a539141b9dec 9 namespace Mikami
MikamiUitOpen 0:a539141b9dec 10 {
MikamiUitOpen 0:a539141b9dec 11 AnalyzerBase::AnalyzerBase(int nData, int nFft, int nUse)
MikamiUitOpen 0:a539141b9dec 12 : N_DATA_(nData), N_FFT_(nFft),
MikamiUitOpen 0:a539141b9dec 13 fft_(nFft), wHm_(nData-1, nUse), b1_(1.0f),
MikamiUitOpen 0:a539141b9dec 14 xData_(nUse), wData_(nUse) {}
MikamiUitOpen 0:a539141b9dec 15
MikamiUitOpen 0:a539141b9dec 16 void AnalyzerBase::Execute(const float xn[], float db[])
MikamiUitOpen 0:a539141b9dec 17 {
MikamiUitOpen 0:a539141b9dec 18 // 高域強調
MikamiUitOpen 0:a539141b9dec 19 for (int n=0; n<N_DATA_-1; n++)
MikamiUitOpen 0:a539141b9dec 20 xData_[n] = xn[n+1] - b1_*xn[n];
MikamiUitOpen 6:c38ec7939609 21
MikamiUitOpen 6:c38ec7939609 22 // 直流分を除去
MikamiUitOpen 6:c38ec7939609 23 float sum = 0;
MikamiUitOpen 6:c38ec7939609 24 for (int n=0; n<N_FFT_; n++) sum = sum + xData_[n];
MikamiUitOpen 6:c38ec7939609 25 float ave = sum/N_FFT_;
MikamiUitOpen 6:c38ec7939609 26 for (int n=0; n<N_FFT_; n++) xData_[n] = xData_[n] - ave;
MikamiUitOpen 6:c38ec7939609 27
MikamiUitOpen 0:a539141b9dec 28 // 窓掛け
MikamiUitOpen 0:a539141b9dec 29 wHm_.Execute(xData_, wData_);
MikamiUitOpen 0:a539141b9dec 30
MikamiUitOpen 0:a539141b9dec 31 Analyze(wData_, db);
MikamiUitOpen 0:a539141b9dec 32 }
MikamiUitOpen 0:a539141b9dec 33 }