Message preamble detector

Details Message preamble detector Message preamble detector

1976-03-05

1977-07-26

Zazworsky, John

Telegraphy

Systems

Printing

178 88, 307233R, 307362, 328136, 328138, 328140, 325321, H03K 5153, H03K 518

Patent

active

040386058

ABSTRACT:
Binary messages received over a radio channel are subject to fading or noise degradation because of the radio channel. Accordingly, a predetermined binary preamble followed by a synchronizing word are transmitted ahead of the message. In order that the synchronization be correct, the end of the preamble should be determined as accurately as possible. This is achieved by fast and slow detectors which receive the preamble. The fast detector output is applied to a time delay. The slow detector and the time delay outputs are applied to an output circuit which produces an output signal in response to the slow detector and the time delay outputs both being present. The fast and slow detectors and the time delay are arranged so that the output signal is produced at the desired time after the preamble begins, thereby accurately indicating when the synchronizing word is to begin.

REFERENCES:
patent: 3508160 (1970-04-01), Poumakis
patent: 3544723 (1970-12-01), Battista
patent: 3705315 (1972-12-01), Clark
patent: 3825842 (1974-07-01), Birchfield et al.

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