9-23C5 B
 What is signal to noise ratio?
A. A measure used that compares the distance of a desired signal to the level of background noise.
B. A measure used that compares the level of a desired signal to the level of background noise.
C. A measure used that compares the frequency of a desired signal to the frequency of background noise.
D. A measure that measures signal in the forward direction and noise in the reverse direction.
