matlab绘制三角波脉冲信号,单位冲激信号、单位阶跃信号、实指数信号、正弦信号、非周期矩形脉冲信号和非周期三角波脉冲信号的频谱...

matlaB函数

连续周期三角波信号频谱图

N=10;

n1=-N:-1;

C1=-4*j*sin(n1*pi/2)/pi^2./n1.^2;

C0=0;

n2=1:N;

C2=-4*j*sin(n2*pi/2)/pi^2./n2.^2;

Cn=[C1 C0 C2];

n=-N:N;

subplot(2,1,1);stem(n,abs(Cn));

subplot(2,1,2);stem(n,angle(Cn));

周期性方波频谱

a=1;tao=0.1;t=0.5;

n0=t/tao;

n=0:2*n0;

fn_p=a*tao/t*(sin(n*pi*tao/t+eps*(n==0)))./(n*pi*tao/t+eps*(n==0)); fn_pabs=abs(fn_p);

fn_pang=angle(fn_p);

fn_mabs=fliplr(fn_pabs(2:(2*n0)+1));

fn_mang=-fliplr(fn_pang(2:(2*n0)+1));

fnabs=[fn_mabs fn_pabs];

fnang=[fn_mang fn_pang];

subplot(2,1,1);stem((-2*n0:2*n0),fnabs);

text(4,0.11,'amplitude spectrum');

subplot(2,1,2);stem((-2*n0:2*n0),fnang);

text(-2,2,'phase spectrum');