Method and apparatus for extracting a predetermined bit pattern

Details Method and apparatus for extracting a predetermined bit pattern Method and apparatus for extracting a predetermined bit pattern

1987-02-12

1988-03-08

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

370105, H04L 708

Patent

active

047303468

ABSTRACT:
An embedded framing bit pattern in a serial bit stream is located by combining the last bit to arrive of the serial bit stream with a predetermined number of prior bits of the serial bit stream which are spaced apart by the pitch of the bits of the framing bit pattern, and this combination of bits is tested to determine if the combination matches part of the framing bit pattern. If a match does not occur, then the bits which were combined together are changed to a bit pattern that will not result in a match when these bits (except for the eldest bit which is disregarded) is combined again with a new bit of the serial bit stream, no matter what the logic state of the new bit. In this manner all of the bits, as they arrive and are combined and tested, will eventually be changed except the bits which are part of the framing bit pattern.

REFERENCES:
patent: 3940563 (1976-02-01), Susset
patent: 4347606 (1982-08-01), Hoogeveen
patent: 4622666 (1986-11-01), Graves et al.

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