Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1987-10-05
1989-02-21
Pellinen, A. D.
Pulse or digital communications
Spread spectrum
Direct sequence
375 55, 375 87, 375 94, 371 55, H04L 702
Patent
active
048072605
ABSTRACT:
A decoder and comparator for Manchester biphase code utilizes a clock recovery logic to recover clock signals directly from the code and thus bypasses the necessity of an external clock. This recovered clock is utilized to input the code into shift registers. Further, a frame sync recovery logic analyzes the code with respect to correspondence of a proper Manchester code format. An encoder is utilized to encode first and second comparators. The first comparator is encoded with error codes for the Manchester code. If the proper Manchester code is present as determined by the frame sync recovery logic and the proper error codes are present, a frame or word of code is output from the shift registers to a first holding latch. If proper Manchester code is present and if a second set of error perameters are met as for instance perameters with respect to either data or address, the frame or word held in the first latch is output to a second latch and from there to an output bus for use by some other device.
REFERENCES:
patent: 3659286 (1972-04-01), Perkins et al.
patent: 4661965 (1987-04-01), Maru
Anderson Terry J.
Block Robert B.
Jennings Derek S.
Northrop Corporation
Pellinen A. D.
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