Time-invariant sys
A time-invariant (TIV) system is a system whose output does not depend explicitly on time. Such systems are regarded as a class of systems in the field of system analysis. Lack of time dependence is captured in the following mathematical property of such a system:
-
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.
