ex020300.m

离散信号处理举例

% Chapter 02: Example 02.03: Signal Synthesis of complex sequence
%
figure(1); clf
% a) x(n) = exp((-0.1+j0.3)n), -10 <= n <= 10;
n = [-10:1:10]; alpha = -0.1+0.3j;
x = exp(alpha*n);
subplot(2,2,1); stem(n,real(x));title('实部');
a=axis;text(a(2)+1,a(3),'n');
subplot(2,2,2); stem(n,imag(x));title('虚部');
a=axis;text(a(2)+1,a(3),'n');
subplot(2,2,3); stem(n,abs(x));title('振幅');xlabel('n');
subplot(2,2,4); stem(n,(180/pi)*angle(x));title('相位'); xlabel('n');