Signal and System

A signal x(t) is a continuous-time signal if t is a continuous variable. If t is a discrete variable, that is, x(t) is defined at discrete t...

Deterministic and Random Signals: Deterministic signals are those signals whose values are completely specified for any given time. Thus, a ...

signal x ( t ) or x[n] is referred to as an even signal if x ( - t ) = x ( r ) x [ - n ] = x [ n ] A signal x ( t ) or x[n] is referred to a...

A continuous-time signal x ( t ) is said to be periodic with period T if there is a positive nonzero value of T for which x(t + T ) = x ( t ...

A special class of systems of great importance consists of systems having feedback. In a feedback system, the output signal is fed back and ...

A system is bounded-input/bounded-output (BIBO) stable if for any bounded input x defined by x the corresponding output y is also bounded de...

If the system is linear and also time-invariant, then it is called a linear rime-invariant (LTI) system.