Decoding circuit

Details Decoding circuit Decoding circuit

1985-12-23

1987-06-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 84, 375 94, 329104, 360 42, 360 48, H04L 2722

Patent

active

046758844

ABSTRACT:
A decoding circuit is operative to decode a differential Manchester code consisting of four symbols "J", "K", "1" and "0" each composed of two consecutive signal elements. For detection of the symbol "J" and consequent determination of the symbol boundary, the decoding circuit has a circuit configuration which takes advantage of the fact that the symbol "K" immediately follows the symbol "J" and three consecutive signal elements, two of which are included in the symbol "J" and one of which is for a symbol immediately preceding the symbol "J", have the same polarity. To prevent an error that a second occurrence of the symbol "J" is detected after completion of detection of the symbol "J", the decoding circuit has an additional circuit configuration which inhibits the detection of the symbol "J" until the symbol "0" or the symbol "1", for example, is detected.

REFERENCES:
patent: 4575684 (1986-03-01), Stamm
Draft IEEE Standard 802.5 by IEEE Project 802; "Token Ring Access Method & Physical Layer Specifications"; Working Draft; 12/1/83.

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