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@7:6275fe158ae8, 2018-10-11 (annotated)

Committer:
MikamiUitOpen
Date:
Thu Oct 11 11:42:48 2018 +0000
Revision:
7:6275fe158ae8
Parent:
2:b55ae17ffd92 
8

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 7:6275fe158ae8 4 // 2018/10/11, 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
MikamiUitOpen 7:6275fe158ae8 13 namespace Mikami
MikamiUitOpen 0:2447a7d225b1 14 {
MikamiUitOpen 7:6275fe158ae8 15 class IirCascade
MikamiUitOpen 0:2447a7d225b1 16 {
MikamiUitOpen 7:6275fe158ae8 17 public:
MikamiUitOpen 7:6275fe158ae8 18 // コンストラクタ
MikamiUitOpen 7:6275fe158ae8 19 IirCascade(int order = 0, const Biquad hk[] = NULL, float g0 = 1)
MikamiUitOpen 7:6275fe158ae8 20 : order_(order), hn_((order+1)/2, hk), g0_(g0) {}
MikamiUitOpen 0:2447a7d225b1 21
MikamiUitOpen 7:6275fe158ae8 22 // フィルタ処理を実行する
MikamiUitOpen 7:6275fe158ae8 23 float Execute(float xn)
MikamiUitOpen 7:6275fe158ae8 24 {
MikamiUitOpen 7:6275fe158ae8 25 float yn = g0_*xn;
MikamiUitOpen 7:6275fe158ae8 26 for (int k=0; k<(order_+1)/2; k++) yn = hn_[k].Execute(yn);
MikamiUitOpen 7:6275fe158ae8 27 return yn;
MikamiUitOpen 7:6275fe158ae8 28 }
MikamiUitOpen 0:2447a7d225b1 29
MikamiUitOpen 7:6275fe158ae8 30 // 係数の設定
MikamiUitOpen 7:6275fe158ae8 31 void SetCoefs(int order, const Biquad::Coefs ck[], float g0)
MikamiUitOpen 0:2447a7d225b1 32 {
MikamiUitOpen 7:6275fe158ae8 33 if (order_ != order)
MikamiUitOpen 7:6275fe158ae8 34 {
MikamiUitOpen 7:6275fe158ae8 35 order_ = order;
MikamiUitOpen 7:6275fe158ae8 36 hn_.SetSize((order+1)/2);
MikamiUitOpen 7:6275fe158ae8 37 }
MikamiUitOpen 7:6275fe158ae8 38 g0_ = g0;
MikamiUitOpen 7:6275fe158ae8 39 for (int k=0; k<(order+1)/2; k++) hn_[k].SetCoefs(ck[k]);
MikamiUitOpen 0:2447a7d225b1 40 }
MikamiUitOpen 7:6275fe158ae8 41
MikamiUitOpen 7:6275fe158ae8 42 // 内部変数（遅延器）のクリア
MikamiUitOpen 7:6275fe158ae8 43 void Clear()
MikamiUitOpen 7:6275fe158ae8 44 { for (int k=0; k<(order_+1)/2; k++) hn_[k].Clear(); }
MikamiUitOpen 0:2447a7d225b1 45
MikamiUitOpen 7:6275fe158ae8 46 private:
MikamiUitOpen 7:6275fe158ae8 47 int order_; // 次数
MikamiUitOpen 7:6275fe158ae8 48 Array<Biquad> hn_; // Biquad クラスのオブジェクトの配列
MikamiUitOpen 7:6275fe158ae8 49 float g0_; // 利得定数
MikamiUitOpen 7:6275fe158ae8 50 };
MikamiUitOpen 7:6275fe158ae8 51 }
MikamiUitOpen 0:2447a7d225b1 52 #endif // IIR_CASCADE_HPP