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. 13, 2004
Filed:
Aug. 18, 2000
Shinya Takahashi, Tokyo, JP;
Ikuo Kajiyama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The renewal of a group of first tap coefficients is controlled according to a reception signal, a transmission signal and a first error signal. In contrast, the renewal of a group of second tap coefficients is controlled according to only the reception signal. An echo canceled output signal is produced from the group of first tap coefficients in cases where an estimate precision of the group of first tap coefficients is higher than that of the group of second tap coefficients, and an echo canceled output signal is produced from the group of second tap coefficients in cases of the before-initial estimate, the echo path change and the infinite return loss. Accordingly, the echo canceled output signal, in which the echo is canceled, can be reliably produced regardless of the echo path change or the infinite return loss.