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:
Apr. 06, 1998
Masashi Takada, Tokyo, JP;
Yoshihiro Ariyama, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An echo/noise canceler has an adaptive filter with coefficients that are applied to recent samples of a received signal to generate an echo replica. The echo replica is subtracted from a local input signal to create a first residual signal, and local background noise is canceled from the first residual signal to create a second residual signal. The echo/noise canceler also stores older samples of the received signal, and uses these older samples and the second residual signal to adjust the coefficients in the adaptive filter. The delay between the recent samples and the older samples compensates for the noise cancellation processing delay between the first residual signal and the second residual signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile