光谱读入、降噪和去背景一体化matlab 源码

clear;clc;
dir=‘D:\m\‘;%%%%%%%%%% 输入文件所在目录
%%%%%%%%%% read the signal of background.
fname=‘background-15mw-500um-10s.txt‘;%输入文件名
filename=strcat（dirfname）;%%%%%%%%%% 构成文件路径
fid=fopen（filename‘r‘）;
num=fscanf（fid‘%f %f‘[2inf]）;
fclose（fid）;
bg_y=num（2:）;bg_x=num（1:）; %backgroud后的信号
subplot（411）;plot（bg_xbg_y‘b‘）;grid;;%画出原始信号波形，同时画四个
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信号
%NL_y=num（2:）-mean（num（23110:3189））;NL_x=num（1:）; %去直流分量的nacl信号
subplot（412）;plot（NL_xNL_y‘r‘）;grid;;%画出nacl原始信号波形
title（‘glue signal‘）;

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%%%%%%%%%%%%%%%%%%%% use wav