The experiment using this program is introduced on "Interface" No.3, CQ publishing Co.,Ltd, 2015. 本プログラムを使った実験は,CQ出版社のインターフェース 2015年3月号で紹介しています.
Dependencies: DSProcessingIO mbed
Diff: ReverbUnit.hpp
- Revision:
- 0:47656a949b95
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ReverbUnit.hpp Tue Jul 15 09:26:17 2014 +0000 @@ -0,0 +1,78 @@ +//-------------------------------------------------------------- +// Reverb unit +// Copyright (c) 2014 MIKAMI, Naoki, 2014/06/28 +//-------------------------------------------------------------- + +#ifndef REVERB_UNIT_HPP +#define REVERB_UNIT_HPP + +#include "mbed.h" + +namespace Mikami +{ + // Base class for reverb unit + template<int delay> class Reverb + { + private: + int ptr_; + float un_[delay]; // for delay + + Reverb(const Reverb&); + Reverb& operator=(const Reverb&); + protected: + float Get() { return un_[ptr_]; } + void Set(float x) + { + un_[ptr_] = x; + if (++ptr_ >= delay) ptr_ = 0; + } + public: + // Constructor + Reverb() : ptr_(0) { Clear(); } + + // Execute of filter (pure virtual function) + virtual float Execute(float x) = 0; + + // Clear internal delay elements + void Clear() + { for (int n=0; n<delay; n++) un_[n] = 0; } + }; + + // Reverb unit using comb filter + template<int delay> class CombFilter : public Reverb<delay> + { + private: + const float G0_; + public: + // Constructor + CombFilter(float g) : G0_(g) {} + + // Execute comb filter + virtual float Execute(float x) + { + float yn = Reverb<delay>::Get(); + Reverb<delay>::Set(x + G0_*yn); + return yn; + } + }; + + // Reverb unit using allpass filter + template<int delay> class AllPassFilter : public Reverb<delay> + { + private: + const float G0_; + public: + // Constructor + AllPassFilter(float g) : G0_(g) {} + + // Execute allpass filter + virtual float Execute(float x) + { + float un = x + G0_*Reverb<delay>::Get(); + float yn = -G0_*un + Reverb<delay>::Get(); + Reverb<delay>::Set(un); + return yn; + } + }; +} +#endif // REVERB_UNIT_HPP