不韋 呂 / F446_AD_DA_Multirate

　Nucleo-F446RE 内蔵の AD/DA を使うためのライブラリ．DA からの出力は，標本化周波数の４倍のレートで行う． 　このライブラリを登録した際のプログラム： Demo_F446_AD_DA_Multirate. Library for built-in ADC and DAC in Nucleo-F446RE. Sampling rate for DAC is four times of that for ADC.

Dependencies:   Array_Matrix

Dependents:   F446_UpSampling_GraphicEqualizer F446_UpSampling_ReverbSystem F446_UpSampling_FrqShifter_Weaver Demo_F446_AD_DA_Multirate ... more

IIR_Cascade.hpp@2:b55ae17ffd92, 2018-05-19 (annotated)

Committer:
MikamiUitOpen
Date:
Sat May 19 04:37:02 2018 +0000
Revision:
2:b55ae17ffd92
Parent:
1:abd7e93549b2
Child:
7:6275fe158ae8
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:2447a7d225b1 1 //---------------------------------------------------
MikamiUitOpen 0:2447a7d225b1 2 // 縦続形 IIR フィルタ
MikamiUitOpen 0:2447a7d225b1 3 //
MikamiUitOpen 2:b55ae17ffd92 4 // 2018/05/19, Copyright (c) 2018 MIKAMI, Naoki
MikamiUitOpen 0:2447a7d225b1 5 //---------------------------------------------------
MikamiUitOpen 0:2447a7d225b1 6
MikamiUitOpen 0:2447a7d225b1 7 #ifndef IIR_CASCADE_HPP
MikamiUitOpen 0:2447a7d225b1 8 #define IIR_CASCADE_HPP
MikamiUitOpen 0:2447a7d225b1 9
MikamiUitOpen 0:2447a7d225b1 10 #include "Biquad.hpp"
MikamiUitOpen 0:2447a7d225b1 11 #include "Array.hpp" // Array クラスが定義されている
MikamiUitOpen 0:2447a7d225b1 12 using namespace Mikami;
MikamiUitOpen 0:2447a7d225b1 13
MikamiUitOpen 0:2447a7d225b1 14 class IirCascade
MikamiUitOpen 0:2447a7d225b1 15 {
MikamiUitOpen 0:2447a7d225b1 16 public:
MikamiUitOpen 0:2447a7d225b1 17 // コンストラクタ
MikamiUitOpen 0:2447a7d225b1 18 IirCascade(int order = 0, const Biquad::Coefs ck[] = NULL, float g0 = 1)
MikamiUitOpen 2:b55ae17ffd92 19 : order_(order), hn_((order+1)/2), g0_(g0)
MikamiUitOpen 0:2447a7d225b1 20 {
MikamiUitOpen 2:b55ae17ffd92 21 for (int k=0; k<(order+1)/2; k++) hn_[k].SetCoefs(ck[k]);
MikamiUitOpen 2:b55ae17ffd92 22 Clear();
MikamiUitOpen 0:2447a7d225b1 23 }
MikamiUitOpen 0:2447a7d225b1 24
MikamiUitOpen 0:2447a7d225b1 25 // フィルタ処理を実行する
MikamiUitOpen 0:2447a7d225b1 26 float Execute(float xn)
MikamiUitOpen 0:2447a7d225b1 27 {
MikamiUitOpen 0:2447a7d225b1 28 float yn = g0_*xn;
MikamiUitOpen 0:2447a7d225b1 29 for (int k=0; k<(order_+1)/2; k++) yn = hn_[k].Execute(yn);
MikamiUitOpen 0:2447a7d225b1 30 return yn;
MikamiUitOpen 0:2447a7d225b1 31 }
MikamiUitOpen 0:2447a7d225b1 32
MikamiUitOpen 0:2447a7d225b1 33 // 係数の設定
MikamiUitOpen 0:2447a7d225b1 34 void SetCoefs(int order, const Biquad::Coefs ck[], float g0)
MikamiUitOpen 0:2447a7d225b1 35 {
MikamiUitOpen 0:2447a7d225b1 36 if (order_ != order)
MikamiUitOpen 0:2447a7d225b1 37 {
MikamiUitOpen 0:2447a7d225b1 38 order_ = order;
MikamiUitOpen 0:2447a7d225b1 39 hn_.SetSize((order+1)/2);
MikamiUitOpen 0:2447a7d225b1 40 }
MikamiUitOpen 0:2447a7d225b1 41 g0_ = g0;
MikamiUitOpen 0:2447a7d225b1 42 for (int k=0; k<(order+1)/2; k++) hn_[k].SetCoefs(ck[k]);
MikamiUitOpen 0:2447a7d225b1 43 }
MikamiUitOpen 0:2447a7d225b1 44
MikamiUitOpen 0:2447a7d225b1 45 // 内部変数（遅延器）のクリア
MikamiUitOpen 0:2447a7d225b1 46 void Clear()
MikamiUitOpen 0:2447a7d225b1 47 { for (int k=0; k<(order_+1)/2; k++) hn_[k].Clear(); }
MikamiUitOpen 0:2447a7d225b1 48
MikamiUitOpen 0:2447a7d225b1 49 private:
MikamiUitOpen 0:2447a7d225b1 50 int order_; // 次数
MikamiUitOpen 2:b55ae17ffd92 51 Array<Biquad> hn_; // Biquad クラスのオブジェクトの配列
MikamiUitOpen 0:2447a7d225b1 52 float g0_; // 利得定数
MikamiUitOpen 0:2447a7d225b1 53 };
MikamiUitOpen 0:2447a7d225b1 54 #endif // IIR_CASCADE_HPP