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以上为对直线的采样与恢复 不同采样周期效果不同。

采样周期越小，信号恢复符合度越高。

对函数 sin(w0*m*T)+sin(w0*(m*T+300))的采样与恢复;

function [s]=Super_Command()
%%调用函数处理恢复采样  Super_Command
clf;
clear;
w0=0.03;                        %信号频率
T=5;                            %采样周期
M=500/T;
m=-M:M;                         %求和项数范围 越多越精确  M=500;

% 待采样函数（可修改）  采样点数与求和项数一致
Xat=sin(w0*(m*T+300));          % w0越小越好  w0=0.01;
%w0=2*pi/T0; T0=200*pi
subplot 211;
stem(m*T,Xat);                  %采样信号
title('采样信号  信号频率w0=0.03  采样周期 T=5 ');
a=1;
for t=-M*T:.1:M*T               %计算各恢复点值
    s(a)=Super_Sign_Rebuild(w0,M,T,t);
    a=a+1;
end;
subplot 212;
t=-M*T:.1:M*T  ;                %恢复信号作图
plot(m*T,Xat,'red',t,s,'k');    %采样信号与恢复信号对比
title('采样信号与恢复信号对比');

function [S]=Super_Sign_Rebuild(w0,N,T,t)
%%信号重建 xa(t)=sum(  x(nT)sin[(pi/T)(t-nT)]/(pi/T)(t-nT) ）
%%采样周期T

n=-N:N;                          %求和项数越多越精确 

Xat=sin(w0*(n*T+300));           %待恢复函数   w0越小越好
Samp=  sin((pi/T)*(t-n*T))./((pi/T)*(t-n*T)); 
S=sum(Xat.*Samp);

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对函数  sin(w0*(m*T+300))的采样与恢复;
http://s16/mw690/af341755hd34ed0e4ccff&690matlab模拟" TITLE="[转载]信号的采样与恢复 matlab模拟" />

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