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:
Dec. 15, 1987
Filed:
Mar. 28, 1985
Haruhiko Nakamura, Yokohama, JP;
Junya Tempaku, Yokosuka, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A phase synchronization circuit for controlling a graphic display device in a teletext receiving system. The phase synchronization circuit includes a delay circuit, adapted to delay in sequence clock signals which are to be phase-synchronized with a reference signal and to produce in sequence delayed clock signals, and a selection circuit, including set/reset circuits and gates, each gate receiving the output of the set/reset circuits and of the delayed clock signals. Among the delay clock signals, the signal that has the nearest edge timing to the edge of external signals is selected. The phase synchronization circuit has a short pull-in time and high-speed synchronization, is suitable for circuit integration, and offers improved reliability.