不韋 呂 / Mbed 2 deprecated CQ_DigitalFilterLab_IIR1st_Variable

CQエレクトロニクス･セミナ「実習・マイコンを動かしながら学ぶディジタル･フィルタ」で使うプログラム．1次IIRフィルタの係数をターミナルから変更できる． http://seminar.cqpub.co.jp/ccm/ES18-0020

Dependencies:   mbed Array_Matrix BSP_DISCO_F746NG LCD_DISCO_F746NG TS_DISCO_F746NG

Filter/IIR1_Variable.hpp@2:aa11055138a2, 2017-11-08 (annotated)

Committer:
MikamiUitOpen
Date:
Wed Nov 08 11:10:56 2017 +0000
Revision:
2:aa11055138a2
Parent:
0:47718d3154d9 
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:47718d3154d9 1 //---------------------------------------------------
MikamiUitOpen 0:47718d3154d9 2 // 一次の IIR フィルタ ― 係数可変
MikamiUitOpen 0:47718d3154d9 3 //
MikamiUitOpen 0:47718d3154d9 4 // 2017/09/24, Copyright (c) 2017 MIKAMI, Naoki
MikamiUitOpen 0:47718d3154d9 5 //---------------------------------------------------
MikamiUitOpen 0:47718d3154d9 6
MikamiUitOpen 0:47718d3154d9 7 #ifndef IIR_1ST_VARIABLE_HPP
MikamiUitOpen 0:47718d3154d9 8 #define IIR_1ST_VARIABLE_HPP
MikamiUitOpen 0:47718d3154d9 9
MikamiUitOpen 0:47718d3154d9 10 #include "mbed.h"
MikamiUitOpen 0:47718d3154d9 11
MikamiUitOpen 0:47718d3154d9 12 class Iir1Variable
MikamiUitOpen 0:47718d3154d9 13 {
MikamiUitOpen 0:47718d3154d9 14 public:
MikamiUitOpen 0:47718d3154d9 15 Iir1Variable(float a1)
MikamiUitOpen 0:47718d3154d9 16 : a1_(a1), b0_(1.0f - a1), yn_(0) {}
MikamiUitOpen 0:47718d3154d9 17
MikamiUitOpen 0:47718d3154d9 18 // フィルタ処理を実行する
MikamiUitOpen 0:47718d3154d9 19 int16_t Execute(int16_t xn)
MikamiUitOpen 0:47718d3154d9 20 {
MikamiUitOpen 0:47718d3154d9 21 yn_ = a1_*yn_ + b0_*xn;
MikamiUitOpen 0:47718d3154d9 22
MikamiUitOpen 0:47718d3154d9 23 return (int16_t)yn_;
MikamiUitOpen 0:47718d3154d9 24 }
MikamiUitOpen 0:47718d3154d9 25
MikamiUitOpen 0:47718d3154d9 26 void SetCoefs(float a1)
MikamiUitOpen 0:47718d3154d9 27 {
MikamiUitOpen 0:47718d3154d9 28 a1_ = a1;
MikamiUitOpen 0:47718d3154d9 29 b0_ = 1.0f - a1;
MikamiUitOpen 0:47718d3154d9 30 }
MikamiUitOpen 0:47718d3154d9 31
MikamiUitOpen 0:47718d3154d9 32 private:
MikamiUitOpen 0:47718d3154d9 33 float a1_; // 係数
MikamiUitOpen 0:47718d3154d9 34 float b0_; // 係数
MikamiUitOpen 0:47718d3154d9 35 float yn_;
MikamiUitOpen 0:47718d3154d9 36 };
MikamiUitOpen 0:47718d3154d9 37 #endif // IIR_1ST_VARIABLE_HPP