不韋 呂 / UIT_IIR_Filter

縦続形 IIR フィルタ用ライブラリ． Library for cascade structure IIR filter.

Dependents:   Demo_IIR_Filter UIT2_VariableIIR_LPF UIT2_VariableIIR_LPFHPF

IIR_Cascade.hpp@2:2533ed0150e7, 2015-09-11 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Sep 11 08:50:13 2015 +0000
Revision:
2:2533ed0150e7
Parent:
1:69a8b728e8d2 
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:d2f279439aaf 1 //----------------------------------------------------------------
MikamiUitOpen 0:d2f279439aaf 2 // 縦続形 IIR フィルタ（Biquad クラスを使用）
MikamiUitOpen 0:d2f279439aaf 3 // Class for IIR filter of cascade structure using Biquad class
MikamiUitOpen 1:69a8b728e8d2 4 // 2015/09/11, Copyright (c) 2015 MIKAMI, Naoki
MikamiUitOpen 0:d2f279439aaf 5 //----------------------------------------------------------------
MikamiUitOpen 0:d2f279439aaf 6
MikamiUitOpen 0:d2f279439aaf 7 #ifndef IIR_CASCADE_HPP
MikamiUitOpen 0:d2f279439aaf 8 #define IIR_CASCADE_HPP
MikamiUitOpen 0:d2f279439aaf 9
MikamiUitOpen 0:d2f279439aaf 10 #include "Biquad.hpp"
MikamiUitOpen 0:d2f279439aaf 11
MikamiUitOpen 0:d2f279439aaf 12 namespace Mikami
MikamiUitOpen 0:d2f279439aaf 13 {
MikamiUitOpen 1:69a8b728e8d2 14 // IIR filter -- Cascade structure
MikamiUitOpen 0:d2f279439aaf 15 template<int order> class IirCascade
MikamiUitOpen 0:d2f279439aaf 16 {
MikamiUitOpen 0:d2f279439aaf 17 public:
MikamiUitOpen 2:2533ed0150e7 18 IirCascade() : g0_(0) {}
MikamiUitOpen 1:69a8b728e8d2 19 IirCascade(float g0, const Biquad::Coefs ck[])
MikamiUitOpen 1:69a8b728e8d2 20 { SetCoefs(g0, ck); }
MikamiUitOpen 1:69a8b728e8d2 21
MikamiUitOpen 1:69a8b728e8d2 22 void SetCoefs(float g0, const Biquad::Coefs ck[])
MikamiUitOpen 0:d2f279439aaf 23 {
MikamiUitOpen 1:69a8b728e8d2 24 g0_ = g0;
MikamiUitOpen 1:69a8b728e8d2 25 for (int k=0; k<order/2; k++)
MikamiUitOpen 1:69a8b728e8d2 26 hk_[k].SetCoefs(ck[k]);
MikamiUitOpen 0:d2f279439aaf 27 }
MikamiUitOpen 0:d2f279439aaf 28
MikamiUitOpen 0:d2f279439aaf 29 float Execute(float xn)
MikamiUitOpen 0:d2f279439aaf 30 {
MikamiUitOpen 0:d2f279439aaf 31 float yn = g0_*xn;
MikamiUitOpen 1:69a8b728e8d2 32 for (int k=0; k<order/2; k++)
MikamiUitOpen 1:69a8b728e8d2 33 yn = hk_[k].Execute(yn);
MikamiUitOpen 1:69a8b728e8d2 34
MikamiUitOpen 0:d2f279439aaf 35 return yn;
MikamiUitOpen 0:d2f279439aaf 36 }
MikamiUitOpen 1:69a8b728e8d2 37
MikamiUitOpen 1:69a8b728e8d2 38 void Clear()
MikamiUitOpen 1:69a8b728e8d2 39 {
MikamiUitOpen 1:69a8b728e8d2 40 for (int k=0; k<order/2; k++)
MikamiUitOpen 1:69a8b728e8d2 41 hk_[k].Clear();
MikamiUitOpen 1:69a8b728e8d2 42 }
MikamiUitOpen 0:d2f279439aaf 43 private:
MikamiUitOpen 1:69a8b728e8d2 44 Biquad hk_[order/2]; // Elements of cascade structure
MikamiUitOpen 1:69a8b728e8d2 45 float g0_; // gain factor
MikamiUitOpen 0:d2f279439aaf 46
MikamiUitOpen 0:d2f279439aaf 47 // disallow copy constructor and assignment operator
MikamiUitOpen 0:d2f279439aaf 48 IirCascade(const IirCascade&);
MikamiUitOpen 1:69a8b728e8d2 49 IirCascade& operator=(const IirCascade&);
MikamiUitOpen 1:69a8b728e8d2 50 };
MikamiUitOpen 0:d2f279439aaf 51 }
MikamiUitOpen 1:69a8b728e8d2 52 #endif // IIR_CASCADE_HPP