matlab 表示基本信号

ゝ一纸荒年。 2023-06-09 12:24 29阅读 0赞

1：指数信号A![e^\{at\}][e_at]:

t=0:0.01:10;
    A=1;
    a=-0.4;
    xt=A*exp(a*t);
    plot(t,xt);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70][]

2:  正弦类的信号Acos(![w\_\{o\}t+\\varphi][w_o_t_varphi])    或者 Asin(![w\_\{o\}t+\\varphi][w_o_t_varphi])

A=1;
    w0=2*pi;
    phi=pi/6;
    t=0:0.001:8;
    xt=A*sin(w0*t+phi);
    plot(t,xt);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 1][]

3:抽样信号Sa(t)  xt=sinc(t)

t=-3*pi:pi/100:3*pi;
    xt=sinc(t/pi);
    plot(t,xt);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 2][]

4：矩形脉冲信号  ：  xt=rectplus(t,width);

t=-4:0.001:4;
    T=1;
    xt=rectpuls(t-2*T,T);
    plot(t,xt)

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 3][]

4: 方波信号和阶跃信号

%%%方波信号
    % t=0:0.001:5;
    % A=1;T=1;W0=2*pi/T;
    % ft=A*square(W0*t,20);
    % plot(t,ft,'RED')
    
    %单位阶跃信号
    % t=-2:0.01:3;
    % t0=0;
    % ut=stepfun(t,t0);
    % plot(t,ut)

5：指数序列信号：  xk=a.^k;  (stem 就是离散的脉冲信号)

A=1;
    k=0:10;
    a=-0.6;
    xk=A*a.^k;
    stem(k,xk);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 4][]

6： tripuls(t,Tw,skew),skew 为斜率，Tw 为宽度，t为信号

%单位脉冲系列
    % k=-50:50;
    % delta =[zeros(1,50),1,zeros(1,50)]
    % stem(k,delta)
    
    %单位阶跃系lie
    % k=-50:50;
    % delta =[zeros(1,50),ones(1,51)]
    % stem(k,delta)
    
    
    t=-3:0.001:3;
    ft=tripuls(t,4,0.5);
    subplot(311);
    plot(t,ft)
    title('x(t)');
    ft=tripuls(2*t,4,0.5);
    subplot(312);
    plot(t,ft);
    title('x(2t)');
    
    
    
    ft=tripuls(2*t-2,4,0.5);
    subplot(313);
    plot(t,ft);
    title('x(2t-2)');

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjUyODA4OQ_size_16_color_FFFFFF_t_70 5][]

[e_at]: https://private.codecogs.com/gif.latex?e%5E%7Bat%7D
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[w_o_t_varphi]: https://private.codecogs.com/gif.latex?w_%7Bo%7Dt&plus;%5Cvarphi
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