Title :
Signal-to-Noise-Ratio Improvement in a PCM System
Author :
Clavier, A.G. ; Panter, P.F. ; Dite, W.
Author_Institution :
Federal Telecommunication Laboratories, Inc., Nutley, N.J.
fDate :
4/1/1949 12:00:00 AM
Abstract :
It is shown for a PCM system that the output signal-to-noise power ratio expressed in decibels is approximately equal to twice the input signal-to-noise power ratio. It is independent of the number of code pulses when a sufficient number are used. The dis-tortion due to quantization varies greatly with the number of levels. Adopting the criterion that the output noise power should equal the distortion power, a relation giving corresponding values of the number of digits and input signal-to-noise ratio is found.
Keywords :
Bandwidth; Circuit noise; Crosstalk; Fluctuations; Noise level; Phase change materials; Pulse modulation; Signal to noise ratio; Text recognition; Voltage;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1949.231639
