System for detecting a marker signal inserted in an...

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

H - Electricity

04

K

352/19, 352/40

H04K 1/06 (2006.01) G11B 20/22 (2006.01) H04L 7/04 (2006.01) H04L 7/08 (2006.01)

Patent

CA 1214266

SYSTEM FOR DETECTING A MARKER SIGNAL INSERTED IN AN INFORMATION SIGNAL ABSTRACT OF THE DISCLOSURE 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.

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