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:
Nov. 02, 2004
Filed:
Sep. 10, 1999
Atsushi Miyashita, Tokorozawa, JP;
Toshiyuki Akiyama, Tokorozawa, JP;
Seiichi Sano, Higashiyamato, JP;
Hisao Koda, Musashimurayama, JP;
Itsuo Ishida, Sayama, JP;
Hiroyuki Takesue, Kodaira, JP;
Tatsuhiro Nakada, Kodaira, JP;
Nobuo Tsukamoto, Akishima, JP;
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
A data transmission system for transmitting data from a transmitter to a receiver located away therefrom. The transmitter includes circuitry for transmitting together a main signal having a carrier modulated with main data to be transmitted and as well as a sub-signal to be used in frequency conversion and generated by modulating a carrier of a predetermined frequency out of a frequency band of the main signal. The receiver includes circuitry for receiving a receive signal from the transmitter and extracting the sub-signal therefrom and also includes circuitry for generating a signal to be used as a reference at the time of converting the receive signal to a signal having a predetermined frequency on the basis of the extracted sub-signal.