clear;clc;
dir=‘D:\m\‘;%%%%%%%%%%?輸入文件所在目錄
%%%%%%%%%%?read?the?signal?of?background.
fname=‘background-15mw-500um-10s.txt‘;%輸入文件名
filename=strcat（dirfname）;%%%%%%%%%%?構成文件路徑
fid=fopen（filename‘r‘）;
num=fscanf（fid‘%f?%f‘[2inf]）;
fclose（fid）;
bg_y=num（2:）;bg_x=num（1:）;?%backgroud后的信號
subplot（411）;plot（bg_xbg_y‘b‘）;grid;;%畫出原始信號波形，同時畫四個
title（‘backgroud?signal‘）;
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fname=‘glu-15mw-500um-10s-2.txt‘;%the?filename?of?nacl
filename=strcat（dirfname）;
fid=fopen（filename‘r‘）;
num=fscanf（fid‘%f?%f‘[2inf]）;
fclose（fid）;
NL_y=num（2:）;NL_x=num（1:）;?%nacl信號
%NL_y=num（2:）-mean（num（23110:3189））;NL_x=num（1:）;?%去直流分量的nacl信號
subplot（412）;plot（NL_xNL_y‘r‘）;grid;;%畫出nacl原始信號波形
title（‘glue?signal‘）;

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%%%%%%%%%%%%%%%%%%%%?use?wav