0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
At a given point in a communications system, the ratio of (a) the power of the desired signal plus the noise to (b) the power of the noise. Note: The (S +N )/N ratio is usually expressed in dB. (188)