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:
Aug. 02, 2005
Filed:
Oct. 17, 2002
Eiichi Nishimura, Tokyo, JP;
Eiichi Nishimura, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An echo canceler having a predictive filter that generates an echo replica signal and an adder that subtracts the echo replica signal from a send input signal also has a receive input amplifier and a clipping circuit. The clipping circuit clips the input to the predictive filter at a threshold level determined by increasing the receive input amplifier gain until distortion of the echo component causes echo cancellation performance to degrade. Alternatively, the echo canceler may have a send input amplifier, a send output amplifier, and an echo replica amplifier that amplifies the predicted echo replica signal. The gain of the send input amplifier is increased to determine the gain at which echo cancellation performance begins to deteriorate due to echo amplification, and the gain of the echo replica amplifier is set to compensate for the echo amplification.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile