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.hpp
- Revision:
- 0:a539141b9dec
- Child:
- 6:c38ec7939609
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySpectrogram/AnalyzerBase.hpp Fri Feb 17 04:55:10 2017 +0000
@@ -0,0 +1,52 @@
+//-------------------------------------------------------
+// Base abstract class for spectrum analysis (Header)
+//
+// 2017/02/09, Copyright (c) 2017 MIKAMI, Naoki
+//-------------------------------------------------------
+
+#ifndef BASE_ANALYZER_HPP
+#define BASE_ANALYZER_HPP
+
+#include "Array.hpp"
+#include "fftReal.hpp"
+#include "Hamming.hpp"
+
+namespace Mikami
+{
+ class AnalyzerBase
+ {
+ public:
+ // nData: Number of data to be analyzed
+ // nFft: Number of FFT points
+ // nUse: FFT, cepstrum: window width + zero padding
+ // Linear prediction: window width
+ AnalyzerBase(int nData, int nFft, int nUse);
+ virtual ~AnalyzerBase() {}
+ void Execute(const float xn[], float db[]);
+ // 高域強調の程度を決める定数の設定（b1 = 1 で差分，b1 = 0 で高域強調なし）
+ void SetHighEmphasizer(float b1) { b1_ = b1; }
+
+ protected:
+ const int N_DATA_;
+ const int N_FFT_;
+
+ FftReal fft_;
+
+ float Norm(Complex x)
+ { return x.real()*x.real() + x.imag()*x.imag(); }
+
+ private:
+ HammingWindow wHm_;
+ float b1_;
+
+ Array<float> xData_; // data to be analyzed
+ Array<float> wData_; // windowd data
+
+ virtual void Analyze(const float wData[], float db[]) = 0;
+
+ // disallow copy constructor and assignment operator
+ AnalyzerBase(const AnalyzerBase& );
+ AnalyzerBase& operator=(const AnalyzerBase& );
+ };
+}
+#endif // BASE_ANALYZER_HPP