The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 1976
Filed:
Jun. 11, 1974
Virgilio Mosca, Milan, IT;
Abstract
A central office of a videotelephone system has a cross-bar switch to establish connections between incoming and outgoing video lines terminating at the transmitters and receivers of the videotelephone sets of the several outlying stations. A central sync-pulse generator works into the incoming video lines to control the sweep circuits of the video receivers of stations to which connections have been established, each video receiver being linked with the associated video transmitter through a delay circuit which actuates the line-scan generators of the transmitter and of the receiver with a relative offset compensating for the transit time of the sync pulses between the central office and the station. The sync pulses are supplied to each incoming video line through an amplifier stage preceded by a shunt circuit including a transistor to which quenching pulses for grounding the line are periodically applied by the sync-pulse generator.