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. 12, 2009
Filed:
Sep. 27, 2001
Eiichi Nishimura, Kanagawa, JP;
Eiichi Nishimura, Kanagawa, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An echo canceler removes the echo of a receive signal from a transmit signal while also controlling the signal level of the transmit signal. The echo canceler generates signal level data for the transmit signal, updates the signal level data when the transmit signal is active and the receive signal is inactive, and amplifies the transmit signal according to the signal level data. The echo canceler also generates an echo cancellation signal from the receive signal, amplifies the echo cancellation signal according to the signal level data, and subtracts the amplified echo cancellation signal from the amplified transmit signal to obtain a transmit output signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile