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. 22, 1990
Filed:
May. 18, 1989
Hiroshi Ohue, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A two-way CATV system, in which a plurality of communication channels are set simultaneously in an upstream communication line between a plurality of end terminal equipment and a center equipment by using frequency division multiplexing, is disclosed. A digital transmultiplexer is arranged at each junction between a trunk line and a branch line for converting a frequency division multiplex signal into a time division multiplex signal. Frequency division multiplex signals from the terminal equipment are converted into time division multiplex signals, and then only a time slot corresponding to a frequency slot containing a signal therein is picked up to thereby prevent upstream noises from flowing into the trunk line.