1.代码
%生成一个10Hz方波，其采样率为1kHz，持续时间为500毫秒。指定占空比为50%
t=0:1/1e3:0.5;
y =square(2*pi*10*t,50);
dutycycle(y,t)
%生成10个三角波，频率为50Hz。采样率为1kHz。
T = 10*(1/50);
fs = 1000;
t = 0:1/fs:T-1/fs;
x1=sawtooth(2*pi*50*t,0);
x2=sawtooth(2*pi*50*t,1/2);
x3=sawtooth(2*pi*50*t,1);
subplot(3,1,1)
plot(t,x1)
subplot(3,1,2)
plot(t,x2)
subplot(3,1,3)
plot(t,x3)
%生成非周期矩形脉冲
%生成200毫秒的矩形脉冲，其采样率为10kHz，宽度为20毫秒。
fs = 10e3;
t = -0.1:1/fs:0.1;
w = 20e-3;
x = rectpuls(t,w);
%向左移45毫秒。
tpast = -45e-3;
xpast = rectpuls(t-tpast,w);
%向右移60毫秒，且宽度减半。
tfutr = 60e-3;
xfutr = rectpuls(t-tfutr,w/2);
plot(t,x,t,xpast,t,xfutr)
ylim([-0.2 1.2])
%生成非周期三角波
%Generate 200 ms of a symmetric triangular pulse with a sample rate of 10 kHz and a width of 40 ms.
fs = 10e3;
t = -0.1:1/fs:0.1;
w = 40e-3;
x = tripuls(t,w);
%One displaced 45 ms into the past and skewed 45% to the left.
tpast = -45e-3;
spast = -0.45;
xpast = tripuls(t-tpast,w,spast);
%One displaced 60 ms into the future, half as wide, and skewed completely to the right.
tfutr = 60e-3;
sfutr = 1;
xfutr = tripuls(t-tfutr,w/2,sfutr);
plot(t,x,t,xpast,t,xfutr)
ylim([-0.2 1.2])
%sinc和diric
t=-2*pi:1/50:2*pi;
subplot(2,1,1);
plot(t,sinc(t));
title('Sinc');
subplot(2,1,2);
plot(t,diric(t,7));
title('Diric');
%高斯正弦脉冲信号
%Plot a 50 kHz Gaussian RF pulse with 60 bandwidth，
%sampled at a rate of 10 MHz. Truncate the pulse where the envelope falls 40 dB below the peak.
%Also plot the quadrature pulse and the RF signal envelope.
tc = gauspuls('cutoff',50e3,0.6,[],-40);
t = -tc : 1e-7 : tc;
[yi,yq,ye] = gauspuls(t,50e3,0.6);
plot(t,yi,t,yq,t,ye)
legend('Inphase','Quadrature','Envelope')2.运行结果
