Signals and System - Part 1

Signal and System:

GATE Scoring: 

2013 - 14 Marks
2012 - 7 Marks

Signal:

A Signal is a single valued function of one or more variables that conveys some information. Signals are represented mathematically as functions of one or more independent variables.

Types of Signals:

• Continuous Time Signals
• Discrete Time Signals
• Periodic Signals
• Even Signals
• Odd Signals
• Energy Signals and Power Signals
• Deterministic and Random Signals
• One Directional and Multi-directional Signals

Representation of Signals:

(a) Continuous Time Signals

Continuous time signal are specified for all values of time.

(b) Discrete Time Signals

A discrete time signals is sequence of numbers. These numbers are assumed to occurring at regular intervals of T seconds. The nth sample of a discrete time signal is generally denoted by x [nT] or simply x [n].

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Signals and System Notes