Time-invariant System

Time-invariant System

A time-invariant (TIV) system is one whose output does not depend explicitly on time.

If the input signal produces an output then any time shifted input, results in a time-shifted output

This property can be satisfied if the transfer function of the system is not a function of time except expressed by the input and output. This property can also be stated in another way in terms of a schematic

If a system is time-invariant then the system block is commutative with an arbitrary delay.