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/LinearPrediction.hpp
- Revision:
- 0:a539141b9dec
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySpectrogram/LinearPrediction.hpp Fri Feb 17 04:55:10 2017 +0000
@@ -0,0 +1,37 @@
+//-----------------------------------------------------
+// Class for linear prediction (Header)
+//
+// 2017/02/11, Copyright (c) 2017 MIKAMI, Naoki
+//-----------------------------------------------------
+
+#ifndef LINEAR_PREDICTION_HPP
+#define LINEAR_PREDICTION_HPP
+
+#include "Array.hpp"
+
+namespace Mikami
+{
+ class LinearPred
+ {
+ public:
+ LinearPred(int nData, int order);
+ ~LinearPred() {}
+ bool Execute(const float x[], float a[], float &em);
+ private:
+ const uint16_t N_DATA_;
+
+ uint16_t order_;
+
+ Array<float> r_; // for auto-correlation
+ Array<float> k_; // for PARCOR coefficients
+ Array<float> am_; // working area
+
+ void AutoCorr(const float x[]);
+ bool Durbin(float a[], float &em);
+
+ // disallow copy constructor and assignment operator
+ LinearPred(const LinearPred& );
+ LinearPred& operator=(const LinearPred& );
+ };
+}
+#endif // LINEAR_PREDICTION_HPP