不韋 呂
Demo program of digital signal processing: Variable LPF/HPF, Vocal canceller, Pitch shifter, Reverbrator. ディジタル信号処理のデモプログラム． 遮断周波数可変 LPF/HPF，ボーカルキャンセラ，ピッチシフタ，残響生成器．
Dependencies: Array_Matrix F446_AD_DA UIT_AQM1602 mbed
Diff: SignalProcessing/IIR_Cascade.hpp
- Revision:
- 0:fa74b1130cc3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SignalProcessing/IIR_Cascade.hpp Sun Jan 29 09:11:30 2017 +0000
@@ -0,0 +1,66 @@
+//--------------------------------------------------------------
+// IIR filter ---- Cascade structure
+
+// 2017/01/26, Copyright (c) 2017 MIKAMI, Naoki
+//--------------------------------------------------------------
+
+#ifndef IIR_CASCADE_HPP
+#define IIR_CASCADE_HPP
+
+#include "mbed.h"
+#include "Biquad.hpp"
+#include "Array.hpp"
+using namespace Mikami;
+
+namespace Mikami
+{
+ // IIR filter -- Cascade structure
+ class IirCascade
+ {
+ public:
+ IirCascade(int order, float g0 = 1,
+ const Biquad::Coefs ck[] = NULL)
+ : ORDER2_(order/2), hk_(order/2)
+ {
+ if (ck != NULL) SetCoefs(g0, ck);
+ else g0_ = g0;
+ }
+
+ void SetCoefs(float g0, const Biquad::Coefs ck[])
+ {
+ g0_ = g0;
+ for (int k=0; k<ORDER2_; k++) hk_[k].SetCoefs(ck[k]);
+ }
+
+ void GetCoefs(float &g0, Biquad::Coefs ck[])
+ {
+ g0 = g0_;
+ for (int k=0; k<ORDER2_; k++) hk_[k].GetCoefs(ck[k]);
+ }
+
+ float Execute(float xn)
+ {
+ float yn = g0_*xn;
+ for (int k=0; k<ORDER2_; k++)
+ yn = hk_[k].Execute(yn);
+
+ return yn;
+ }
+
+ void Clear()
+ {
+ for (int k=0; k<ORDER2_; k++)
+ hk_[k].Clear();
+ }
+
+ private:
+ const int ORDER2_;
+ Array<Biquad> hk_; // Elements of cascade structure
+ float g0_; // gain factor
+
+ // disallow copy constructor and assignment operator
+ IirCascade(const IirCascade&);
+ IirCascade& operator=(const IirCascade&);
+ };
+}
+#endif // IIR_CASCADE_HPP