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离散系统的时域分享.doc

Laboratory Exercise 2

DISCRETE-TIME SYSTEMS: TIME-DOMAIN REPRESENTATION

2.1 SIMULATION OF DISCRETE-TIME SYSTEMS

Project 2.1 The Moving Average System

A copy of Program P2_1 is given below:

n = 0:100;

s1 = cos(2*pi*0.05*n); % A low frequency sinusoid

s2 = cos(2*pi*0.47*n); % A high frequency sinusoid

x = s1 s2;

M = input('Desired length of the filter = ');

num = ones(1,M);

y = filter(num,1,x)/M;

clf;

subplot(2,2,1);

plot(n,s1);

axis([0, 100, -2, 2]);

xlabel('Time index n'); ylabel('Amplitude');

title('Signal # 1');

subplot(2,2,2);

plot(n,s2);

axis([0, 100, -2, 2]);

xlabel('Time index n'); ylabel('Amplitude');

title('Signal # 2');

subplot(2,2,3);

plot(n,x);

axis([0, 100, -2, 2]);

xlabel('Time index n'); ylabel('Amplitude');

title('Input Signal');

subplot(2,2,4);

plot(n,y);

axis([0, 100, -2, 2]);

xlabel('Time index n'); ylabel('Amplitude');

title('Output Signal');

axis;