Method for selecting sync marks and sync mark detectors

Details Method for selecting sync marks and sync mark detectors Method for selecting sync marks and sync mark detectors

2006-05-30

2006-05-30

Burd, Kevin (Department: 2631)

Pulse or digital communications

Synchronizers

C375S342000, C375S355000, C375S366000, C375S368000

Reexamination Certificate

active

07054398

ABSTRACT:
A sync mark detector identifies a sync mark in an incoming bitstream of a communications channel. A bit comparing circuit compares the sync mark bit-by-bit to the incoming bitstream if channel irregularities do not exist. A symbol comparing circuit compares the sync mark symbol-by-symbol to the incoming bitstream if channel irregularities do exist. The bit comparing circuit implements a bit level matching rule. The symbol comparing circuit implements a symbol level matching rule. The bit comparing circuit generates a sync mark found state when the bit level matching rule is satisfied. The symbol comparing circuit generates a sync mark found state when the symbol level matching rule is satisfied. Post coding such as NRZ, INRZI, or NRZI can be used.

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