不韋 呂 / Mbed 2 deprecated UIT2_VariableIIR_LPF

Cutoff frequency variable LPF by IIR 6th-order Butterworth filter for ST Nucleo F401RE.

Dependencies:   UIT_IIR_Filter UIT_ACM1602NI UITDSP_ADDA mbed UIT_AQM1602

IIR_Cascade.hpp@0:a9412b9e85b7, 2014-10-23 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Oct 23 06:44:40 2014 +0000
Revision:
0:a9412b9e85b7
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:a9412b9e85b7 1 //--------------------------------------------------------------
MikamiUitOpen 0:a9412b9e85b7 2 // IIR filter ---- Cascade structure
MikamiUitOpen 0:a9412b9e85b7 3 // 2014/10/23, Copyright (c) 2014 MIKAMI, Naoki
MikamiUitOpen 0:a9412b9e85b7 4 //--------------------------------------------------------------
MikamiUitOpen 0:a9412b9e85b7 5
MikamiUitOpen 0:a9412b9e85b7 6 #ifndef IIR_CASCADE_HPP
MikamiUitOpen 0:a9412b9e85b7 7 #define IIR_CASCADE_HPP
MikamiUitOpen 0:a9412b9e85b7 8
MikamiUitOpen 0:a9412b9e85b7 9 #include "mbed.h"
MikamiUitOpen 0:a9412b9e85b7 10 #include "Biquad.hpp"
MikamiUitOpen 0:a9412b9e85b7 11
MikamiUitOpen 0:a9412b9e85b7 12 namespace Mikami
MikamiUitOpen 0:a9412b9e85b7 13 {
MikamiUitOpen 0:a9412b9e85b7 14 // IIR filter -- Cascade structure
MikamiUitOpen 0:a9412b9e85b7 15 template<int order> class IirCascade
MikamiUitOpen 0:a9412b9e85b7 16 {
MikamiUitOpen 0:a9412b9e85b7 17 private:
MikamiUitOpen 0:a9412b9e85b7 18 Biquad hk_[order]; // Elements of cascade structure
MikamiUitOpen 0:a9412b9e85b7 19 float g0_; // gain factor
MikamiUitOpen 0:a9412b9e85b7 20
MikamiUitOpen 0:a9412b9e85b7 21 IirCascade(const IirCascade&);
MikamiUitOpen 0:a9412b9e85b7 22 IirCascade& operator=(const IirCascade&);
MikamiUitOpen 0:a9412b9e85b7 23
MikamiUitOpen 0:a9412b9e85b7 24 public:
MikamiUitOpen 0:a9412b9e85b7 25 IirCascade() {}
MikamiUitOpen 0:a9412b9e85b7 26 IirCascade(float g0, const Biquad::Coefs ck[])
MikamiUitOpen 0:a9412b9e85b7 27 { SetCoefs(g0, ck); }
MikamiUitOpen 0:a9412b9e85b7 28
MikamiUitOpen 0:a9412b9e85b7 29 void SetCoefs(float g0, const Biquad::Coefs ck[])
MikamiUitOpen 0:a9412b9e85b7 30 {
MikamiUitOpen 0:a9412b9e85b7 31 g0_ = g0;
MikamiUitOpen 0:a9412b9e85b7 32 for (int k=0; k<order; k++)
MikamiUitOpen 0:a9412b9e85b7 33 hk_[k] = Biquad(ck[k]);
MikamiUitOpen 0:a9412b9e85b7 34 }
MikamiUitOpen 0:a9412b9e85b7 35
MikamiUitOpen 0:a9412b9e85b7 36 float Execute(float xn)
MikamiUitOpen 0:a9412b9e85b7 37 {
MikamiUitOpen 0:a9412b9e85b7 38 float yn = g0_*xn;
MikamiUitOpen 0:a9412b9e85b7 39 for (int k=0; k<order; k++)
MikamiUitOpen 0:a9412b9e85b7 40 yn = hk_[k].Execute(yn);
MikamiUitOpen 0:a9412b9e85b7 41
MikamiUitOpen 0:a9412b9e85b7 42 return yn;
MikamiUitOpen 0:a9412b9e85b7 43 }
MikamiUitOpen 0:a9412b9e85b7 44
MikamiUitOpen 0:a9412b9e85b7 45 void Clear()
MikamiUitOpen 0:a9412b9e85b7 46 {
MikamiUitOpen 0:a9412b9e85b7 47 for (int k=0; k<order; k++)
MikamiUitOpen 0:a9412b9e85b7 48 hk_[k].Clear();
MikamiUitOpen 0:a9412b9e85b7 49 }
MikamiUitOpen 0:a9412b9e85b7 50 };
MikamiUitOpen 0:a9412b9e85b7 51 }
MikamiUitOpen 0:a9412b9e85b7 52 #endif // IIR_CASCADE_HPP
MikamiUitOpen 0:a9412b9e85b7 53
MikamiUitOpen 0:a9412b9e85b7 54
MikamiUitOpen 0:a9412b9e85b7 55