Alicia is talking on her cell phone to her friend maya. if maya is in a crowded subway terminal, alicia finds that she has to nearly shout for maya to be able to hear her. however, when maya is in a meadow on her grandparents' farm, she can easily tell what alicia is watching on tv as they talk. this is one illustration of

signal-to-noise ratio

Explanation:

The measure which compares level of desired signal to that of the background noise in the system is known is signal-to-noise ratio. Signal-to-noise ratio is the ratio of the signal power to that of noise. It is expressed often on decibels. The ratio which is higher than 1:1, means that there is more signal as compared to noise.

Alicia when talking to Maya has to shout when there is more background noise and has to talk easily when there is no noise is an illustration of signal-to-noise ratio.