Digital bi phase data recovery system

Details Digital bi phase data recovery system Digital bi phase data recovery system

1991-08-09

1993-04-06

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 55, 375 87, 329310, H04L 2722

Patent

active

052009807

ABSTRACT:
A data recovery system for deriving digital data from a bi phase encoded stream wherein signal transition occurs at mid-bit or bit boundary having an edge detector for detecting the occurrence of each fallen edge of a data stream, an edge decoder connected to the detector for determining the time between successive falling edges, a falling edge identifier connected to the edge decoder for determining whether a detected fallen edge occurs on a bit boundary or at a mid-bit, a falling edge memory connected to the falling edge identifier for remembering whether the previous falling edge occurred at a bit boundary or at mid-bit, a data decoder connected to receive input from the falling edge memory and the edge decoder, and having logic for determining the recovered data according to a table in which the data is identified in response to the occurrence at a bit boundary or at mid-bit and a selected spacing between falling edges.

REFERENCES:
patent: 3982195 (1976-09-01), Turner
patent: 4267595 (1981-05-01), Heinandez
patent: 4805191 (1989-02-01), Burch et al.
patent: 4866739 (1989-09-01), Agazzi et al.
patent: 4876700 (1989-10-01), Grindahl
patent: 4937840 (1990-06-01), Hotine
patent: 5001728 (1991-03-01), Fuldner

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