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. 03, 2019
Filed:
Nov. 16, 2015
Mitsubishi Electric Corporation, Tokyo, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
Disclosed is an echo canceller () including: a false echo calculator () that acquires current and previous filter-coefficient groups used by an adaptive filtering unit (), and that calculates plural false echo signals by performing a filtering operation using each of the current and previous filter-coefficient groups on a sequence of reception signals (x(n)); a voice-transmission signal buffer that outputs a previous voice-transmission signal (y(n−1)); an evaluation value calculator () that calculates plural evaluated values of an echo cancellation quantity by using the previous voice-transmission signal; a filter selector () that selects a new filter-coefficient group on the basis of the plural evaluated values of the echo cancellation quantity; a foreground filter () that performs a filtering operation using the new filter-coefficient group on the sequence of reception signals (x(n)) to generate an estimated echo component; and a subtractor () that subtracts the estimated echo component from a voice-transmission signal to generate a residual signal (e(n)).