System for detecting a marker signal inserted in an information

Details System for detecting a marker signal inserted in an information System for detecting a marker signal inserted in an information

1983-12-21

1986-07-01

Cangialosi, Salvatore

Telegraphy

Systems

Printing

178 2217, H04L 900

Patent

active

045981698

ABSTRACT:
A system for detecting a marker signal with a predetermined pattern inserted periodically in an information signal comprises a circuit which repetitively generates window signals and successively shifts the window signals in a step-wise fashion during a predetermined interval, a detecting circuit which employs the window signals to detect at least a portion of a marker signal in the information signal when at least the portion of the detected marker signal occurs during one of the window signals, a circuit which determines when the detected marker signal has the predetermined pattern to generate a net marker signal in response thereto, and a circuit responsive to the net marker signal which repetitively generates subsequent unshifted window signals beginning a predetermined time after the detected marker signal.

REFERENCES:
patent: 3978285 (1976-08-01), Tan et al.
patent: 4091423 (1978-05-01), Branscome
patent: 4275466 (1981-06-01), Yamamoto
patent: 4305152 (1981-12-01), Asakawa et al.
patent: 4322576 (1982-03-01), Miller
patent: 4344180 (1982-08-01), Cummiskey
patent: 4347606 (1982-08-01), Hoogeveen
patent: 4397020 (1983-08-01), Howson
patent: 4434323 (1984-02-01), Levine et al.
patent: 4453260 (1984-06-01), Inagawa et al.
patent: 4466017 (1984-08-01), Banker

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