Q1Signals and Systems
Question
2 marks
Define signal. Differentiate between discrete time signal and continuous time signal.
Answer
A signal conveys information about a physical phenomenon. CT signals are defined at every instant, while DT signals are defined only at discrete steps.
Signal: A signal is any physical quantity that varies with respect to time, space, or any other independent variable, and carries information about the state or behavior of a physical system.
- Continuous-Time (CT) Signal: Defined for every continuous instant of time. Its domain is the set of real numbers (e.g., ).
- Discrete-Time (DT) Signal: Defined only at specific, discrete intervals of time. Its domain is the set of integers (e.g., ).