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. 31, 2012
Filed:
Oct. 03, 2008
Takuya Nagai, Nagoya, JP;
Tsuyoshi Ohashi, Hashima, JP;
Hironori Hirata, Nagoya, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya-Shi, Aichi-Ken, JP;
Abstract
There is provided a radio-frequency communication device that can sufficiently eliminate a leakage signal from a transmission side included in a received signal. The communication device includes a cancel amplitude controlling unitselectively suppressing supply of a cancel signal to a cancel signal synthesizing unit, a received-signal terminating unitselectively terminating a received-signal input terminal, a signal strength detecting unitdetecting a signal strength, a memory unitstoring a signal strength detected by the signal strength detecting unit, a signal strength comparing unitcomparing a plurality kinds of signal strengths read out from the memory unit, and a cancel signal controlling unitcontrolling an amplitude and/or a phase of the cancel signal based on a result of the comparison by the signal strength comparing unit. Thus, suppressing the cancel signal by the cancel amplitude controlling unitenables accurate detection of a strength of the received signal, as well as terminating the received signal by the received-signal terminating unitenables accurate detection of a strength of the cancel signal.