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NRZI Encoder/Decoder With Jitter-Smoothing Mechanism

IP.com Disclosure Number: IPCOM000034306D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Chang, LL Ku, EH Ott, WB [+details]

Abstract

This article describes an algorithm for encoding and decoding of non-return to zero inverted (NRZI) coding with jitter-smoothing mechanism. NRZI data encoding format is one of several popular data encoding formats employed in data communication networks. The jitter is the shifting of the edge of a signal from the nominal position due to the characteristics of the modem being used in the network and the transmission over a length of cable. Smoothing the jitter will improve the quality of the network's data transmission. The encoding rule is rather simple. Data transition only occurs at the bit cell boundary when the original data bit equals 0, and the direction of transition depends upon the present encoded signal level, to 0 if 1 and to 1 if 0.