ABSTRACT
Discrete-time signals can be represented as sequences of numbers. Thus, if x is a discrete-time signal, its values can, in general, be indexed by n as follows: x = { … , x ( − 2 ) , x ( − 1 ) , x ( 0 ) , x ( 1 ) , x ( 2 ) , … , x ( n ) , … } https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315222172/d45cfe97-d60d-404d-8be8-81afbd5d1052/content/eq709.tif"/>
