Audio singal input and output example for DISCO-F746. Input: MEMS mic, Output: CN10 OUT, Acoustic effect: echo and frequency shift. DISCO-F746 によるオーディオ信号入出力.入力:MEMS マイク,出力:CN10 OUT,音響効果:エコー,周波数変換.
Dependencies: F746_GUI F746_SAI_IO
SignalProcessing/ReverbUnit.hpp
- Committer:
- MikamiUitOpen
- Date:
- 2016-04-14
- Revision:
- 0:f064b50f238e
File content as of revision 0:f064b50f238e:
//-------------------------------------------------------------- // Reverb unit // 2016/04/12, Copyright (c) 2016 MIKAMI, Naoki //-------------------------------------------------------------- #ifndef REVERB_UNIT_HPP #define REVERB_UNIT_HPP #include "mbed.h" namespace Mikami { // Base class for reverb unit class Reverb { public: // Constructor Reverb(int delay) : ptr_(0), delay_(delay) { un_ = new float[delay]; Clear(); } ~Reverb() { delete[] un_; } // 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; } protected: float Get() { return un_[ptr_]; } float Get(int n) { int k = ptr_ + n; if (k > delay_) k -= delay_; if (k < 0) k += delay_; return un_[k]; } void Set(float x) { un_[ptr_] = x; if (++ptr_ >= delay_) ptr_ = 0; } private: int ptr_; int delay_; float *un_; // for delay Reverb(const Reverb&); Reverb& operator=(const Reverb&); }; // Reverb unit using comb filter class CombFilter : public Reverb { public: // Constructor CombFilter(float g, int delay) : Reverb(delay), G0_(g) {} // Execute comb filter virtual float Execute(float x) { float yn = Reverb::Get(); Reverb::Set(x + G0_*yn); return yn; } // Execute comb filter with variable delay float Execute(float x, int n) { float yn = Reverb::Get(n); Reverb::Set(x + G0_*yn); return yn; } private: const float G0_; }; // Reverb unit using allpass filter class AllPassFilter : public Reverb { public: // Constructor AllPassFilter(float g, int delay) : Reverb(delay), G0_(g) {} // Execute allpass filter virtual float Execute(float x) { float un = x + G0_*Reverb::Get(); float yn = -G0_*un + Reverb::Get(); Reverb::Set(un); return yn; } private: const float G0_; }; } #endif // REVERB_UNIT_HPP