不韋 呂 / Mbed 2 deprecated F446_MySoundMachine

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

SignalProcessing/ReverbUnit.hpp@5:503bd366fd73, 2017-01-31 (annotated)

Committer:
MikamiUitOpen
Date:
Tue Jan 31 12:52:35 2017 +0000
Revision:
5:503bd366fd73
Parent:
0:fa74b1130cc3 
6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:fa74b1130cc3 1 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 2 // Reverb unit
MikamiUitOpen 5:503bd366fd73 3 // 2017/01/31, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 0:fa74b1130cc3 4 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 5
MikamiUitOpen 0:fa74b1130cc3 6 #ifndef REVERB_UNIT_HPP
MikamiUitOpen 0:fa74b1130cc3 7 #define REVERB_UNIT_HPP
MikamiUitOpen 0:fa74b1130cc3 8
MikamiUitOpen 0:fa74b1130cc3 9 #include "mbed.h"
MikamiUitOpen 0:fa74b1130cc3 10 #include "Array.hpp"
MikamiUitOpen 0:fa74b1130cc3 11 namespace Mikami
MikamiUitOpen 0:fa74b1130cc3 12 {
MikamiUitOpen 0:fa74b1130cc3 13 // Base class for reverb unit
MikamiUitOpen 0:fa74b1130cc3 14 class Reverb
MikamiUitOpen 0:fa74b1130cc3 15 {
MikamiUitOpen 0:fa74b1130cc3 16 public:
MikamiUitOpen 0:fa74b1130cc3 17 // Constructor
MikamiUitOpen 0:fa74b1130cc3 18 Reverb(int delay) : DELAY_(delay), un_(delay)
MikamiUitOpen 0:fa74b1130cc3 19 {
MikamiUitOpen 0:fa74b1130cc3 20 ptr_ = 0;
MikamiUitOpen 0:fa74b1130cc3 21 Clear();
MikamiUitOpen 0:fa74b1130cc3 22 }
MikamiUitOpen 0:fa74b1130cc3 23
MikamiUitOpen 0:fa74b1130cc3 24 ~Reverb() {}
MikamiUitOpen 0:fa74b1130cc3 25
MikamiUitOpen 0:fa74b1130cc3 26 // Execute of filter (pure virtual function)
MikamiUitOpen 0:fa74b1130cc3 27 virtual float Execute(float x) = 0;
MikamiUitOpen 0:fa74b1130cc3 28
MikamiUitOpen 0:fa74b1130cc3 29 // Clear internal delay elements
MikamiUitOpen 0:fa74b1130cc3 30 void Clear()
MikamiUitOpen 0:fa74b1130cc3 31 { for (int n=0; n<DELAY_; n++) un_[n] = 0; }
MikamiUitOpen 0:fa74b1130cc3 32
MikamiUitOpen 0:fa74b1130cc3 33 protected:
MikamiUitOpen 0:fa74b1130cc3 34 float Get() { return un_[ptr_]; }
MikamiUitOpen 0:fa74b1130cc3 35
MikamiUitOpen 0:fa74b1130cc3 36 void Set(float x)
MikamiUitOpen 0:fa74b1130cc3 37 {
MikamiUitOpen 0:fa74b1130cc3 38 un_[ptr_] = x;
MikamiUitOpen 0:fa74b1130cc3 39 if (++ptr_ >= DELAY_) ptr_ = 0;
MikamiUitOpen 0:fa74b1130cc3 40 }
MikamiUitOpen 5:503bd366fd73 41
MikamiUitOpen 0:fa74b1130cc3 42 private:
MikamiUitOpen 0:fa74b1130cc3 43 const int DELAY_;
MikamiUitOpen 0:fa74b1130cc3 44 Array<float> un_; // for delay
MikamiUitOpen 0:fa74b1130cc3 45 int ptr_;
MikamiUitOpen 0:fa74b1130cc3 46
MikamiUitOpen 0:fa74b1130cc3 47 // disallow copy constructor and assignment operator
MikamiUitOpen 0:fa74b1130cc3 48 Reverb(const Reverb&);
MikamiUitOpen 0:fa74b1130cc3 49 Reverb& operator=(const Reverb&);
MikamiUitOpen 0:fa74b1130cc3 50 };
MikamiUitOpen 0:fa74b1130cc3 51
MikamiUitOpen 0:fa74b1130cc3 52 // Reverb unit using comb filter
MikamiUitOpen 0:fa74b1130cc3 53 class CombFilter : public Reverb
MikamiUitOpen 0:fa74b1130cc3 54 {
MikamiUitOpen 0:fa74b1130cc3 55 public:
MikamiUitOpen 0:fa74b1130cc3 56 // Constructor
MikamiUitOpen 0:fa74b1130cc3 57 CombFilter(float g, int delay)
MikamiUitOpen 0:fa74b1130cc3 58 : Reverb(delay), G0_(g) {}
MikamiUitOpen 0:fa74b1130cc3 59
MikamiUitOpen 0:fa74b1130cc3 60 // Execute comb filter
MikamiUitOpen 0:fa74b1130cc3 61 virtual float Execute(float x)
MikamiUitOpen 0:fa74b1130cc3 62 {
MikamiUitOpen 0:fa74b1130cc3 63 float yn = Reverb::Get();
MikamiUitOpen 0:fa74b1130cc3 64 Reverb::Set(x + G0_*yn);
MikamiUitOpen 0:fa74b1130cc3 65 return yn;
MikamiUitOpen 0:fa74b1130cc3 66 }
MikamiUitOpen 0:fa74b1130cc3 67
MikamiUitOpen 0:fa74b1130cc3 68 private:
MikamiUitOpen 0:fa74b1130cc3 69 const float G0_;
MikamiUitOpen 0:fa74b1130cc3 70 };
MikamiUitOpen 0:fa74b1130cc3 71
MikamiUitOpen 0:fa74b1130cc3 72 // Reverb unit using allpass filter
MikamiUitOpen 0:fa74b1130cc3 73 class AllPassFilter : public Reverb
MikamiUitOpen 0:fa74b1130cc3 74 {
MikamiUitOpen 0:fa74b1130cc3 75 public:
MikamiUitOpen 0:fa74b1130cc3 76 // Constructor
MikamiUitOpen 0:fa74b1130cc3 77 AllPassFilter(float g, int delay)
MikamiUitOpen 0:fa74b1130cc3 78 : Reverb(delay), G0_(g) {}
MikamiUitOpen 0:fa74b1130cc3 79
MikamiUitOpen 0:fa74b1130cc3 80 // Execute allpass filter
MikamiUitOpen 0:fa74b1130cc3 81 virtual float Execute(float x)
MikamiUitOpen 0:fa74b1130cc3 82 {
MikamiUitOpen 0:fa74b1130cc3 83 float un = x + G0_*Reverb::Get();
MikamiUitOpen 0:fa74b1130cc3 84 float yn = -G0_*un + Reverb::Get();
MikamiUitOpen 0:fa74b1130cc3 85 Reverb::Set(un);
MikamiUitOpen 0:fa74b1130cc3 86 return yn;
MikamiUitOpen 0:fa74b1130cc3 87 }
MikamiUitOpen 5:503bd366fd73 88
MikamiUitOpen 0:fa74b1130cc3 89 private:
MikamiUitOpen 0:fa74b1130cc3 90 const float G0_;
MikamiUitOpen 0:fa74b1130cc3 91 };
MikamiUitOpen 0:fa74b1130cc3 92 }
MikamiUitOpen 0:fa74b1130cc3 93 #endif // REVERB_UNIT_HPP