1.1 FILTER
“Filter is a device that removes unwanted signal from
original signal”.Filters are a basic component of all signal
processing and telecommunication systems. The primary
functions of a filter one or more of the followings
(a)To confine a signal into a prescribed frequency band
or channel
(b)To decompose a signal into two or more sub-band
signals for sub-band signal processing
(c) To modify the frequency spectrum of a signal
(d) To model the input-output relation of a system
voice production, musical instruments, telephone line
echo, and room acoustics