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:
May. 12, 1998
Filed:
Oct. 12, 1995
Hitachi, Ltd., Tokyo, JP;
Abstract
A television conversation/monitoring system connecting a central station and a plurality of terminal stations through an ISDN line. The central station has a picture/sound conversation/monitoring device, a picture input/output device, a sound input/output device, a system control portion and an ISDN line terminal device, and each of the terminal stations has a picture/sound conversation/monitoring device, a system control portion, a picture input/output device, a sound input/output device, a terminal station state change detecting device and an ISDN line terminal device. The central-station-side system control device has a function to control the line capacity, so that conversation and monitoring can be performed with a plurality of terminal stations simultaneously while the line capacity is changed in accordance with the state of terminals.