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. 31, 2005
Filed:
Jul. 14, 1999
Yoshio Sakata, Tokyo, JP;
Hideki Kamoi, Tokyo, JP;
Hiroki Gouko, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An adaptive digital filter () is adapted to generate a pseudo echo Se which is produced by imitating a noise, using part of receiving signals Si and to output it. An echo produced through an echo path () is mixed, as an echo noise, with a sending signal So and this sending signal is attenuated by a level attenuator (). The level attenuator (), in order to match the amplitude level of the echo noise of the sending signal So to that of the pseudo echo, attenuates the sending signal So and feeds it to a subtracter (). The subtracter () eliminates echo noises by subtracting the pseudo echo Se from the sending signal So. Even if the echo path is in the state of amplified system, the complete elimination of the echo can be achieved accordingly.