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Bi-Phase to NRZ Decoder

IP.com Disclosure Number: IPCOM000054060D
Original Publication Date: 1980-Dec-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Abramson, P Rogers, LS [+details]

Abstract

This article describes a means for decoding a bi-phase encoded signal into the NRZ format. A digital feedback loop and highly simplified circuit incorporating it provide the desired result. Bi-phase signal encoding is used for converting an NRZ signal into a form which has no DC components for transmission. The particular format considered here encodes the binary 1 level of NRZ data into one cycle of the clock frequency employed and a 0 level of the NRZ data into a half cycle of half the clock frequency. Thus, a single baud or time slot occupied by a bit of the bi-phase signal is equal to the time of one cycle of the basic clock frequency.