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Signal-to-Noise-Ratio Improvement in a PCM System

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3 Author(s)
Clavier, A.G. ; Federal Telecommunication Laboratories, Inc., Nutley, N.J. ; Panter, P.F. ; Dite, W.

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.

Published in:

Proceedings of the IRE  (Volume:37 ,  Issue: 4 )

Date of Publication:

April 1949

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