用Matlab绘制波形 用matlab绘制波形图
\u5982\u4f55\u7528matlab\u753b\u6ce2\u5f62\u56fet=0:0.1:5;plot(t,2.*cos(2.*pi.*t))\uff1bgrid;
plot(t,4.*cos(2.*pi.*t+pi./3))\uff1bgrid;
plot(t,(4.*cos(2.*pi.*t+pi./3)+2.*cos(2.*pi.*t)))\uff1bgrid;
\u8fc8\u7279\u83b1\u535a
\u672c\u89c6\u9891\u5c55\u793a\u5982\u4f55\u7528matlab\u7ed8\u5236\u6563\u5706\u72b6\u6001\u56fe\uff0c\u53ef\u7528\u4e8e\u76f8\u5173\u79d1\u7814\u6570\u636e\u7ed8\u56fe\uff01
N=1024;
fs=1024;
t=0:1/fs:(N-1)/fs;
x=sin(200*pi*t);
%原始波形
figure
plot(t,x)%%%波形
set(gca,'xlim',[0,0.2],'ylim',[-1.3,1.3])
title('原始波形图')
%频谱分析
a=fft(x);
a=abs(a)*2/N;
f=0:fs/N:(N-1)*fs/N;
figure
plot(f,a)
title('幅频谱图')
%逆变换后时域图
b=ifft(a)*N/2;
figure
plot(t,b)
set(gca,'xlim',[0,0.2],'ylim',[-1.3,1.3])
title('反变换后波形')
%首先可以拟合一个函数：x=(heaviside(n)-heaviside(n-4))+
%(heaviside(n+4)-heaviside(n+1))*(2*n+5);
clear
syms n
x=(heaviside(n)-heaviside(n-4))*6+(heaviside(n+4)-heaviside(n+1))*(2*n+5);
n=-10:0.1:10;
xn=subs(x,n);
plot(n,xn)
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