Experiment with MATLAB
Exponential signal
The expression is, where a is a real number. If a>0, the signal grows with time; if a<0, the signal decays with time; if a=0, the signal becomes a DC signal. In fact, the exponential signal of attenuation is encountered more frequently.
It can be expressed by the function exp in MATLAB, and its calling form is: y=K exp(at )
Draw the waveforms of the three signals
Generate rectangular pulse directly in MATLAB, periodic rectangular pulse
Periodic rectangular wave (square wave) signal:
It is represented by the square function in MATLAB, and its calling form is
y=square(t,D UTY)
Its function is similar to sin(t), which is used to generate a periodic square wave signal with a duration of t and an amplitude of ±1. The DUTY parameter represents the duty cycle, that is, the positive value in a period of the signal. percentage. For example, the MATLAB reference program for a periodic square wave signal with a frequency of 30 Hz is as follows:
Show the code below
t=-2*pi/100:pi/1024:2*pi/100;
y=square(2*pi*30*t,50);
plot(t,y);
grid
ylim([-1.5 1.5])
