不韋 呂
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
Diff: MySpectrogram/AnalyzerBase.cpp
- Revision:
- 0:a539141b9dec
- Child:
- 6:c38ec7939609
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySpectrogram/AnalyzerBase.cpp Fri Feb 17 04:55:10 2017 +0000
@@ -0,0 +1,27 @@
+//-------------------------------------------------------
+// Base abstract class for spectrum analysis
+//
+// 2017/02/09, Copyright (c) 2017 MIKAMI, Naoki
+//-------------------------------------------------------
+
+#include "AnalyzerBase.hpp"
+
+namespace Mikami
+{
+ AnalyzerBase::AnalyzerBase(int nData, int nFft, int nUse)
+ : N_DATA_(nData), N_FFT_(nFft),
+ fft_(nFft), wHm_(nData-1, nUse), b1_(1.0f),
+ xData_(nUse), wData_(nUse) {}
+
+ void AnalyzerBase::Execute(const float xn[], float db[])
+ {
+ // 高域強調
+ for (int n=0; n<N_DATA_-1; n++)
+ xData_[n] = xn[n+1] - b1_*xn[n];
+
+ // 窓掛け
+ wHm_.Execute(xData_, wData_);
+
+ Analyze(wData_, db);
+ }
+}