不韋 呂 / Mbed 2 deprecated SDR_FM_Tx

AM中波放送用SDR．CICフィルタのみを使用．CQ出版社「トランジスタ技術」誌，2021年5月号に掲載

Dependencies:   mbed

SDR_Library/Iir1st.hpp@1:32d6e3f7df30, 2021-03-03 (annotated)

Committer:
MikamiUitOpen
Date:
Wed Mar 03 01:20:09 2021 +0000
Revision:
1:32d6e3f7df30
Parent:
0:7a653530c8ce 
2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:7a653530c8ce 1 //-----------------------------------------------------------------
MikamiUitOpen 0:7a653530c8ce 2 // 一次の IIR フィルタ
MikamiUitOpen 0:7a653530c8ce 3 // y[n] = a1*y[n-1] + (1 - a1)*x[n]
MikamiUitOpen 0:7a653530c8ce 4 //
MikamiUitOpen 0:7a653530c8ce 5 // 2020/08/05, Copyright (c) 2020 MIKAMI, Naoki
MikamiUitOpen 0:7a653530c8ce 6 //-----------------------------------------------------------------
MikamiUitOpen 0:7a653530c8ce 7
MikamiUitOpen 0:7a653530c8ce 8 #include "mbed.h"
MikamiUitOpen 0:7a653530c8ce 9
MikamiUitOpen 0:7a653530c8ce 10 #ifndef IIR_1ST_HPP
MikamiUitOpen 0:7a653530c8ce 11 #define IIR_1ST_HPP
MikamiUitOpen 0:7a653530c8ce 12 namespace Mikami
MikamiUitOpen 0:7a653530c8ce 13 {
MikamiUitOpen 0:7a653530c8ce 14 class Iir1st
MikamiUitOpen 0:7a653530c8ce 15 {
MikamiUitOpen 0:7a653530c8ce 16 public:
MikamiUitOpen 0:7a653530c8ce 17 // コンストラクタ
MikamiUitOpen 0:7a653530c8ce 18 // a1 フィルタの係数
MikamiUitOpen 0:7a653530c8ce 19 Iir1st(float a1) : A1_(a1), B0_(1.0f - a1), yn_(0) {}
MikamiUitOpen 0:7a653530c8ce 20
MikamiUitOpen 0:7a653530c8ce 21 // フィルタの実行
MikamiUitOpen 0:7a653530c8ce 22 float Execute(float xn)
MikamiUitOpen 0:7a653530c8ce 23 {
MikamiUitOpen 0:7a653530c8ce 24 yn_ = A1_*yn_ + B0_*xn;
MikamiUitOpen 0:7a653530c8ce 25 return yn_;
MikamiUitOpen 0:7a653530c8ce 26 }
MikamiUitOpen 0:7a653530c8ce 27
MikamiUitOpen 0:7a653530c8ce 28 private:
MikamiUitOpen 0:7a653530c8ce 29 const float A1_; // フィルタ係数
MikamiUitOpen 0:7a653530c8ce 30 const float B0_; // フィルタ係数
MikamiUitOpen 0:7a653530c8ce 31 float yn_; // 出力
MikamiUitOpen 0:7a653530c8ce 32
MikamiUitOpen 0:7a653530c8ce 33 // コピー･コンストラクタ，代入演算子の禁止のため
MikamiUitOpen 0:7a653530c8ce 34 Iir1st(const Iir1st&);
MikamiUitOpen 0:7a653530c8ce 35 Iir1st& operator=(const Iir1st&);
MikamiUitOpen 0:7a653530c8ce 36 };
MikamiUitOpen 0:7a653530c8ce 37 }
MikamiUitOpen 0:7a653530c8ce 38 #endif // IIR_1ST_HPP