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:
Jul. 08, 2003
Filed:
Jun. 25, 1999
Masaru Adachi, Kodaira, JP;
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
A multi-carrier modulation apparatus to which transmultiplexers are applied. A multiplexing signal is treated as a synthesis of a plurality of multiplexed signals which are separated by a wider interval than the multiplexing frequency interval. Signals of channels to M continuously frequency-multiplexed at a channel interval f are treated as a synthetic signal of signals of channel to channel N−1 and signals of channel to channel N which are frequency-multiplexed at a channel interval f . Individual multiplexed signals are synthesized by a plurality of transmultiplexers of less multiplexing number to make characteristics of polyphase filters required for the transmultiplexers less sharp.