Source: http://www.google.com/patents/US5408530?dq=5,870,513
Timestamp: 2015-02-01 01:25:19
Document Index: 563246466

Matched Legal Cases: ['art 12', 'art 13', 'art 14', 'art 12', 'art 13', 'art 14', 'art 16', 'art 18', 'art 19']

Patent US5408530 - Echo cancelling method and echo canceller using the same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA received signal vector x(n), a coefficient error covariance matrix P(n) from a memory part 12 and a forgetting factor ν from a memory part 13 are provided to a gain calculating part 14 to obtain a gain vector k(n). The thus obtained gain vector k(n) and an error e(n) between an echo and an echo replica...http://www.google.com/patents/US5408530?utm_source=gb-gplus-sharePatent US5408530 - Echo cancelling method and echo canceller using the sameAdvanced Patent SearchPublication numberUS5408530 APublication typeGrantApplication numberUS 08/127,375Publication dateApr 18, 1995Filing dateSep 28, 1993Priority dateSep 30, 1992Fee statusLapsedPublication number08127375, 127375, US 5408530 A, US 5408530A, US-A-5408530, US5408530 A, US5408530AInventorsShoji Makino, Yutaka KanedaOriginal AssigneeNippon Telegraph And Telephone CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (2), Non-Patent Citations (1), Referenced by (15), Classifications (9), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetEcho cancelling method and echo canceller using the sameUS 5408530 AAbstract A received signal vector x(n), a coefficient error covariance matrix P(n) from a memory part 12 and a forgetting factor ν from a memory part 13 are provided to a gain calculating part 14 to obtain a gain vector k(n). The thus obtained gain vector k(n) and an error e(n) between an echo and an echo replica are multiplied in a multiplying part 16. The multiplied output and a filter coefficient h(n) from a memory part 18 are added together to update the latter. The thus updated filter coefficient is used as the filter coefficient of an estimated echo path (an FIR filter, for example). The coefficient error covariance matrix P(n), the gain vector k(n), the received signal vector x(n) and the forgetting factor ν are provided to an updating part 19 to update the coefficient error covariance matrix P(n), and an adjustment matrix A representing an expectation of an impulse response variation of an echo path is added to the updated coefficient error covariance matrix P(n) and the added value is used as a new coefficient error covariance matrix P(n).
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5001701 *Aug 7, 1989Mar 19, 1991At&T Bell LaboratoriesSubband echo canceler including real time allocation among the subbandsUS5272695 *Sep 9, 1991Dec 21, 1993Nippon Telegraph And Telephone CorporationSubband echo canceller with adjustable coefficients using a series of step sizes* Cited by examinerNon-Patent CitationsReference1 *Acoustic Echo Canceller Algorithm Based on the Variation Characteristics of a Room Impulse Response (Shoji Makino, Yutaka Kaneda) IEEE, 1990.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5548642 *Dec 23, 1994Aug 20, 1996At&T Corp.Optimization of adaptive filter tap settings for subband acoustic echo cancelers in teleconferencingUS5570423 *Aug 25, 1995Oct 29, 1996Alcatel N.V.Method of providing adaptive echo cancellationUS5587998 *Mar 3, 1995Dec 24, 1996At&TMethod and apparatus for reducing residual far-end echo in voice communication networksUS5600718 *Feb 24, 1995Feb 4, 1997Ericsson Inc.Apparatus and method for adaptively precompensating for loudspeaker distortionsUS5638439 *Mar 15, 1996Jun 10, 1997Oki Electric Industry Co., Ltd.Adaptive filter and echo cancellerUS5677951 *Jun 19, 1995Oct 14, 1997Lucent Technologies Inc.Adaptive filter and method for implementing echo cancellationUS5680450 *Feb 24, 1995Oct 21, 1997Ericsson Inc.Apparatus and method for canceling acoustic echoes including non-linear distortions in loudspeaker telephonesUS5737409 *Mar 5, 1996Apr 7, 1998Sony CorporationEcho removing apparatusUS5761318 *Sep 25, 1996Jun 2, 1998Nippon Telegraph And Telephone CorporationMethod and apparatus for multi-channel acoustic echo cancellationUS5909426 *Mar 31, 1997Jun 1, 1999Rockwell Science Center, Inc.Orthogonal LMS algorithms for fast line echo canceler trainingUS5995620 *Aug 8, 1997Nov 30, 1999Telefonaktiebolaget Lm EricssonEcho canceller having Kalman filter for optimal adaptationUS6441764 *May 5, 2000Aug 27, 2002Massachusetts Institute Of TechnologyHybrid analog/digital signal codingUS6510224May 20, 1999Jan 21, 2003Telefonaktiebolaget L M EricssonEnhancement of near-end voice signals in an echo suppression systemUS6895094 *Mar 20, 2000May 17, 2005France TelecomAdaptive identification method and device, and adaptive echo canceller implementing such methodWO1996027951A1 *Jan 11, 1996Sep 12, 1996At & T CorpMethod and apparatus for reducing residual far-end echo in voice communication networks* Cited by examinerClassifications U.S. Classification379/392, 379/402, 379/406.08, 379/406.14, 379/391International ClassificationH04B3/23, H04M9/08Cooperative ClassificationH04M9/082European ClassificationH04M9/08CLegal EventsDateCodeEventDescriptionJun 12, 2007FPExpired due to failure to pay maintenance feeEffective date: 20070418Apr 18, 2007LAPSLapse for failure to pay maintenance feesNov 1, 2006REMIMaintenance fee reminder mailedSep 27, 2002FPAYFee paymentYear of fee payment: 8May 13, 1998FPAYFee paymentYear of fee payment: 4Sep 28, 1993ASAssignmentOwner name: NIPPON TELEGRAPH, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MAKINO, SHOJI;KANEDA, YUTAKA;REEL/FRAME:006720/0162Effective date: 19930916Owner name: TELEPHONE CORPORATION, JAPANRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services