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, 2001
Filed:
Oct. 07, 1997
Ho-Chong Park, Seongnam, KR;
Young-Ky Kim, Seoul, KR;
Abstract
An echo canceler for canceling an echo signal mixed in an input signal received from a hybrid circuit. The echo canceler has a double filter structure comprised of an adaptive filter and a fixed filter. The adaptive filter receives the input signal to generate a first echo estimation signal according to a filter coefficient thereof, and the fixed filter receives the input signal to generate a second echo estimation signal according to a filter coefficient thereof. A first adder subtracts the first echo estimation signal from the input signal to generate a first echo-canceled signal, and a second adder subtracts the second echo estimation signal from the input signal to generate a second echo-canceled signal. A mode selector selectively outputs one of the first and second echo-canceled signals having a relatively more canceled echo component.