Error detection and indication system for bi-phase encoded digit

Details Error detection and indication system for bi-phase encoded digit Error detection and indication system for bi-phase encoded digit

1977-10-05

1978-10-24

Smith, Jerry

Communications: electrical

Digital comparator systems

G08C 2500

Patent

active

041224418

ABSTRACT:
A real-time error detection system for bi-phase or similarly encoded digital data is disclosed. Bi-phase or similarly encoded data, which utilizes two transitions in a bit cell for either a binary "1" or a binary "0" value, and one transition in a bit cell for the other binary value inherently generates an even number of transitions of the binary value represented by the two transitions between the occurrence of the other binary value represented by one transition. Monitoring for the number of transitions of the binary value represented by two transitions provides an indication of the occurrence of an odd number of transitions. This represents an error condition. The system utilizes a logic circuit responsive to the binary "1" and binary "0" data clock retrieved from the self-clocking bi-phase encoded data. When an error condition is detected, an error indicating signal is generated.

REFERENCES:
patent: 3335224 (1967-08-01), Meslener et al.
patent: 3417333 (1968-12-01), Atzenbeck
patent: 3836956 (1974-09-01), Cross
patent: 3938082 (1976-02-01), Schowe, Jr.

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