Noise and Attenuation both have same definition that is unwanted sound. An amplifier is an electronic device that increases the voltage, current, or power of a signal. the disadvantages of use the amplifier is beside the speech, the attenuation or noise is also got amplified.

Source:

T101 Telecom 101 – 4th edition 2016
7″ x 9″ softcover book • 488 pages • 4th edition • published 2016
ISBN 9781894887038 (print)   ISBN 9781894887786 (eBook)