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/IIR_Cascade.hpp@0:fa74b1130cc3, 2017-01-29 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Jan 29 09:11:30 2017 +0000
Revision:
0:fa74b1130cc3
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:fa74b1130cc3 1 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 2 // IIR filter ---- Cascade structure
MikamiUitOpen 0:fa74b1130cc3 3
MikamiUitOpen 0:fa74b1130cc3 4 // 2017/01/26, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 0:fa74b1130cc3 5 //--------------------------------------------------------------
MikamiUitOpen 0:fa74b1130cc3 6
MikamiUitOpen 0:fa74b1130cc3 7 #ifndef IIR_CASCADE_HPP
MikamiUitOpen 0:fa74b1130cc3 8 #define IIR_CASCADE_HPP
MikamiUitOpen 0:fa74b1130cc3 9
MikamiUitOpen 0:fa74b1130cc3 10 #include "mbed.h"
MikamiUitOpen 0:fa74b1130cc3 11 #include "Biquad.hpp"
MikamiUitOpen 0:fa74b1130cc3 12 #include "Array.hpp"
MikamiUitOpen 0:fa74b1130cc3 13 using namespace Mikami;
MikamiUitOpen 0:fa74b1130cc3 14
MikamiUitOpen 0:fa74b1130cc3 15 namespace Mikami
MikamiUitOpen 0:fa74b1130cc3 16 {
MikamiUitOpen 0:fa74b1130cc3 17 // IIR filter -- Cascade structure
MikamiUitOpen 0:fa74b1130cc3 18 class IirCascade
MikamiUitOpen 0:fa74b1130cc3 19 {
MikamiUitOpen 0:fa74b1130cc3 20 public:
MikamiUitOpen 0:fa74b1130cc3 21 IirCascade(int order, float g0 = 1,
MikamiUitOpen 0:fa74b1130cc3 22 const Biquad::Coefs ck[] = NULL)
MikamiUitOpen 0:fa74b1130cc3 23 : ORDER2_(order/2), hk_(order/2)
MikamiUitOpen 0:fa74b1130cc3 24 {
MikamiUitOpen 0:fa74b1130cc3 25 if (ck != NULL) SetCoefs(g0, ck);
MikamiUitOpen 0:fa74b1130cc3 26 else g0_ = g0;
MikamiUitOpen 0:fa74b1130cc3 27 }
MikamiUitOpen 0:fa74b1130cc3 28
MikamiUitOpen 0:fa74b1130cc3 29 void SetCoefs(float g0, const Biquad::Coefs ck[])
MikamiUitOpen 0:fa74b1130cc3 30 {
MikamiUitOpen 0:fa74b1130cc3 31 g0_ = g0;
MikamiUitOpen 0:fa74b1130cc3 32 for (int k=0; k<ORDER2_; k++) hk_[k].SetCoefs(ck[k]);
MikamiUitOpen 0:fa74b1130cc3 33 }
MikamiUitOpen 0:fa74b1130cc3 34
MikamiUitOpen 0:fa74b1130cc3 35 void GetCoefs(float &g0, Biquad::Coefs ck[])
MikamiUitOpen 0:fa74b1130cc3 36 {
MikamiUitOpen 0:fa74b1130cc3 37 g0 = g0_;
MikamiUitOpen 0:fa74b1130cc3 38 for (int k=0; k<ORDER2_; k++) hk_[k].GetCoefs(ck[k]);
MikamiUitOpen 0:fa74b1130cc3 39 }
MikamiUitOpen 0:fa74b1130cc3 40
MikamiUitOpen 0:fa74b1130cc3 41 float Execute(float xn)
MikamiUitOpen 0:fa74b1130cc3 42 {
MikamiUitOpen 0:fa74b1130cc3 43 float yn = g0_*xn;
MikamiUitOpen 0:fa74b1130cc3 44 for (int k=0; k<ORDER2_; k++)
MikamiUitOpen 0:fa74b1130cc3 45 yn = hk_[k].Execute(yn);
MikamiUitOpen 0:fa74b1130cc3 46
MikamiUitOpen 0:fa74b1130cc3 47 return yn;
MikamiUitOpen 0:fa74b1130cc3 48 }
MikamiUitOpen 0:fa74b1130cc3 49
MikamiUitOpen 0:fa74b1130cc3 50 void Clear()
MikamiUitOpen 0:fa74b1130cc3 51 {
MikamiUitOpen 0:fa74b1130cc3 52 for (int k=0; k<ORDER2_; k++)
MikamiUitOpen 0:fa74b1130cc3 53 hk_[k].Clear();
MikamiUitOpen 0:fa74b1130cc3 54 }
MikamiUitOpen 0:fa74b1130cc3 55
MikamiUitOpen 0:fa74b1130cc3 56 private:
MikamiUitOpen 0:fa74b1130cc3 57 const int ORDER2_;
MikamiUitOpen 0:fa74b1130cc3 58 Array<Biquad> hk_; // Elements of cascade structure
MikamiUitOpen 0:fa74b1130cc3 59 float g0_; // gain factor
MikamiUitOpen 0:fa74b1130cc3 60
MikamiUitOpen 0:fa74b1130cc3 61 // disallow copy constructor and assignment operator
MikamiUitOpen 0:fa74b1130cc3 62 IirCascade(const IirCascade&);
MikamiUitOpen 0:fa74b1130cc3 63 IirCascade& operator=(const IirCascade&);
MikamiUitOpen 0:fa74b1130cc3 64 };
MikamiUitOpen 0:fa74b1130cc3 65 }
MikamiUitOpen 0:fa74b1130cc3 66 #endif // IIR_CASCADE_HPP