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:
Jan. 30, 1990
Filed:
Feb. 29, 1988
Tsuneo Negi, Yokohama, JP;
Sadasuke Kurahayashi, Niiza, JP;
Teruyuki Nishii, Yokohama, JP;
Yasuhide Ueno, Fuchu, JP;
Masahiro Sakamoto, Tokyo, JP;
Takeshi Ono, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A data communication apparatus includes a data communication section for preforming data communication according to full duplex communication, a testing section for performing a communication test prior to the data communication, and a transmission controller for determining whether full duplex communication can be performed during a period of the communication test performed by the testing section. The testing section includes a backward signal generator, a backward signal detector, and a control signal analyzer. The backward signal generator and the backward signal detector may be replaced with an echo canceller.