Real and imaginary signals examples

1. What are real and imaginary signals?
2. What are real signals?
3. What are different types of signals?

What are real and imaginary signals?

Real and Imaginary Signals

Example: If x(t)= 3 then x*(t)=3*=3 here x(t) is a real signal. If x(t)= 3j then x*(t)=3j* = -3j = -x(t) hence x(t) is a odd signal. Note: For a real signal, imaginary part should be zero. Similarly for an imaginary signal, real part should be zero.

What are real signals?

A real signal at any given time takes its value in the set of real numbers, and a complex signal takes its value in the set of complex numbers.

What are different types of signals?

Two main types of signals encountered in practice are analog and digital. The figure shows a digital signal that results from approximating an analog signal by its values at particular time instants. Digital signals are quantized, while analog signals are continuous.