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:
Dec. 27, 2016
Filed:
May. 14, 2013
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Tomoharu Awano, Chiyoda-ku, JP;
Takashi Sudo, Chiyoda-ku, JP;
Atsuyoshi Yano, Chiyoda-ku, JP;
Atsushi Hotta, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-ku, JP;
Abstract
An echo cancellation device includes: a full-band echo canceller that generates a pseudo-echo signal; a downsample processor that downsamples a received signal and extracts a low-band component delayed by a delay amount D; a delay controller that delays the low-band component by a delay amount D; a delay controller that delays an output signal of the delay controller by a delay amount D; a low-band echo canceller that generates a pseudo-echo signal delayed by a delay amount D+D; and an upsample processor that upsamples the low-band pseudo-echo signal to generate a full-band pseudo-echo signal delayed by the delay amount 2D+D. The delay controllers control the delay amounts Dand Dsuch that a tap length Lsatisfies a condition of L≧2D+D=D+D, the tap length Lindicating a response time of the adaptive filter in the full-band echo canceller.