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/VariableLpHp.hpp
- Revision:
- 0:fa74b1130cc3
- Child:
- 4:2f06a5893e4a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SignalProcessing/VariableLpHp.hpp Sun Jan 29 09:11:30 2017 +0000
@@ -0,0 +1,50 @@
+//--------------------------------------------------------------
+// 遮断周波数可変フィルタ，LPF と HPF
+//
+// 2017/01/26, Copyright (c) 2017 MIKAMI, Naoki
+//--------------------------------------------------------------
+
+#ifndef VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP
+#define VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP
+
+#include "IIR_Cascade.hpp"
+#include "SignalProcessing.hpp"
+#include "BilinearDesignLH.hpp"
+#include "Array.hpp"
+using namespace Mikami;
+
+class VariableLpHp : public SignalProcessing
+{
+public:
+ VariableLpHp(int order, float fs)
+ : ORDER2_(order/2), coefs_(order/2), coefsIir_(order/2),
+ designer_(order, fs), filter_(order) {}
+
+ virtual float Execute(float xn1, float xn2)
+ { return filter_.Execute((xn1 + xn2)*0.5f); }
+
+ void Design(float fc, BilinearDesign::Type passBand)
+ {
+ float g0;
+ designer_.Execute(fc, passBand, coefs_, g0);
+ for (int n=0; n<ORDER2_; n++)
+ {
+ coefsIir_[n].a1 = coefs_[n].a1;
+ coefsIir_[n].a2 = coefs_[n].a2;
+ coefsIir_[n].b1 = coefs_[n].b1;
+ coefsIir_[n].b2 = 1.0f;
+ }
+ filter_.SetCoefs(g0, coefsIir_);
+ filter_.Clear();
+ }
+
+private:
+ const int ORDER2_;
+
+ Array<BilinearDesign::Coefs> coefs_;
+ Array<Biquad::Coefs> coefsIir_;
+
+ BilinearDesign designer_;
+ IirCascade filter_;
+};
+#endif // VARIABLE_LOWPASS_HIGHPASS_FILTER_HPP
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