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. 05, 1991
Filed:
Apr. 13, 1989
Jun Kobayashi, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for processing video signals to produce a combined picture video signal from which a large picture and one or more small pictures being inset in the large picture are simultaneously reproduced on a display screen. Video signals providing image information for small pictures are stored in a memory mainly on the basis of a storage control signal produced from a result of a phase comparison between a reference signal and a vertical sync signal separated from each of the video signals providing image information for small pictures. The reference signal has pulses recurrent with a period twice the repetition period of pulses of the vertical sync signal in the video signal or identical with the repetition period of pulses of a horizontal sync signal in the video signal, and assumes a relatively high level and a relatively low level alternately with a duty factor of 50%.