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:
Aug. 11, 1998
Filed:
Jan. 31, 1996
Maki Hiraizumi, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
A video-on-demand system is comprised of a source station which transmits video signals of different channels on an optical transmission line to a number of subscriber terminals in accordance with subscriber requests. The source station includes a multiplexing unit which generates a frequency division multiplexed signal from the video signals in such a manner that vertical synchronizations of the video signals of different channels are in accordance with each other, and transmits the multiplexed signal to each subscriber terminal. Each subscriber terminal includes a transmitting unit which transmits a control signal indicative of a subscriber request to the source station at a frequency band different from frequency bands of the video signals of the frequency division multiplexed signal, the control signal being transmitted during a vertical blanking period of the video signals.