COMPUTER AIDED DIGITAL FILTER DESIGN

Abstract

A signal can be defined as a function that conveys information, generally about the state or behaviour of a physical system. Although signals can be represented in many ways; in all cases the information is contained in a pettern_of variations of some form. [5] The independent variable- of the mathematical representation of a signal may be either continous or discrete. Continuous time signals are signals that are defined at each and every instant of time, while, discrete time signal is defined at discrete instants of time only. In addition to 'the fact that independent variables can be either continuous or discrete, the signal amplitude may be either continuous or discrete. The signals for which both time and amplitude are discrete are called Digital Signals. While if both are continuous then it is called Analog Signal