CA2283085A1 - Echo controller with compensation for variable delay networks - Google Patents
Echo controller with compensation for variable delay networks Download PDFInfo
- Publication number
- CA2283085A1 CA2283085A1 CA002283085A CA2283085A CA2283085A1 CA 2283085 A1 CA2283085 A1 CA 2283085A1 CA 002283085 A CA002283085 A CA 002283085A CA 2283085 A CA2283085 A CA 2283085A CA 2283085 A1 CA2283085 A1 CA 2283085A1
- Authority
- CA
- Canada
- Prior art keywords
- echo
- user
- delay
- amount
- telephone connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/002—Applications of echo suppressors or cancellers in telephonic connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
- H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
- H04M7/1275—Methods and means to improve the telephone service quality, e.g. reservation, prioritisation or admission control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
Abstract
The present invention provides a method of and system for controlling and effectively reducing the echo introduced in telephone connections over variable delay networks such as LAN/WAN networks. The invention includes estimation of the round-trip user-to-user delay in the telephone connection. This estimation can be made in a number of different ways, including using timestamps in existing data packets according to a Real-Time Protocol (RTP) or a Real-Time Control Protocol (RTCP) and by sending timestamps in data packets according to an Internet Control Message Protocol (ICMP). The invention further includes determination of an echo control target for the telephone connection based upon the estimated user-to-user delay. This target represents the total amount of echo control required to limit the probability of objectionable echo to less than a predetermined threshold. The amount of echo control required increases as the length of the estimated user-to-user delay increases. The invention further includes determination of the minimum amount of signal-dependent loss required to supplement the acoustic echo cancellation in order to reach the determined echo control target. Then, in the invention, the determined amount of signal- dependent loss is applied to the telephone connection to effectively reduce echo based upon the estimated user-to-user delay.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/150,698 | 1998-09-10 | ||
US09/150,698 US6324170B1 (en) | 1998-09-10 | 1998-09-10 | Echo controller with compensation for variable delay networks |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2283085A1 true CA2283085A1 (en) | 2000-03-10 |
CA2283085C CA2283085C (en) | 2007-06-05 |
Family
ID=22535643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002283085A Expired - Fee Related CA2283085C (en) | 1998-09-10 | 1999-09-09 | Echo controller with compensation for variable delay networks |
Country Status (4)
Country | Link |
---|---|
US (1) | US6324170B1 (en) |
EP (1) | EP0986190B1 (en) |
CA (1) | CA2283085C (en) |
DE (1) | DE69934066T2 (en) |
Families Citing this family (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4603600A (en) | 1999-05-10 | 2000-11-21 | Nokia Corporation | Routing in a network |
JP3576430B2 (en) * | 1999-09-01 | 2004-10-13 | 沖電気工業株式会社 | Automatic gain controller |
US6577648B1 (en) * | 1999-10-04 | 2003-06-10 | Nokia Corporation | Method and apparatus for determining VoIP QoS characteristics of a network using multiple streams of packets and synchronizing measurements of the streams |
US6526140B1 (en) * | 1999-11-03 | 2003-02-25 | Tellabs Operations, Inc. | Consolidated voice activity detection and noise estimation |
US6724736B1 (en) * | 2000-05-12 | 2004-04-20 | 3Com Corporation | Remote echo cancellation in a packet based network |
US6768748B2 (en) * | 2001-07-30 | 2004-07-27 | Overture Networks, Inc. | Flexible mapping of circuits into packets |
EP1286509A3 (en) * | 2001-08-21 | 2004-02-04 | Siemens Aktiengesellschaft | Method and apparatus for echo compensation in a telecommunication network |
US6963760B2 (en) * | 2001-10-01 | 2005-11-08 | General Motors Corporation | Method and apparatus for generating DTMF tones using voice-recognition commands during hands-free communication in a vehicle |
EP1345336A1 (en) * | 2002-03-11 | 2003-09-17 | Alcatel | Automatic gain control method for echo attenuation |
GB2389286A (en) * | 2002-05-28 | 2003-12-03 | Mitel Knowledge Corp | Echo cancellation |
US7742443B2 (en) * | 2002-05-28 | 2010-06-22 | Maarten Menzo Wentink | Transmit power management in shared-communications channel networks |
CN1666435A (en) * | 2002-07-02 | 2005-09-07 | 西门子公司 | Runtime-dependent switching off of the echo compensation in packet networks |
US7394770B2 (en) * | 2002-10-25 | 2008-07-01 | General Instrument Corporation | Use of synchronized clocks to provide input and output time stamps for performance measurement of traffic within a communications system |
US7164764B2 (en) * | 2002-11-07 | 2007-01-16 | Solarflare Communications, Inc. | Method and apparatus for precode crosstalk mitigation |
US7525918B2 (en) * | 2003-01-21 | 2009-04-28 | Broadcom Corporation | Using RTCP statistics for media system control |
FR2853188B1 (en) * | 2003-03-31 | 2005-10-21 | France Telecom | QUALITY OF SERVICE MEASURING DEVICE AND USE OF SUCH A DEVICE IN A REAL-TIME DATA TRANSMISSION NETWORK |
US20040213354A1 (en) * | 2003-04-28 | 2004-10-28 | Jones William W. | Mixed domain cancellation |
US8363535B2 (en) | 2003-04-28 | 2013-01-29 | Marvell International Ltd. | Frequency domain echo and next cancellation |
US7228138B2 (en) * | 2003-12-05 | 2007-06-05 | Sony Ericsson Mobile Communications Ab | Methods, servers, mobile stations, and computer program products using GPS referenced time and delay information in messages for GPS time assistance |
FR2867344B1 (en) * | 2004-03-04 | 2006-06-02 | Cit Alcatel | DETERMINATION OF QUALITY OF SERVICE PARAMETERS OF A NETWORK FROM A RADIO COMMUNICATION TERMINAL |
CN100502324C (en) * | 2005-08-31 | 2009-06-17 | 华为技术有限公司 | Method for obtaining chain circuit evaluating parameter |
CN1984102A (en) * | 2005-12-13 | 2007-06-20 | 华为技术有限公司 | Device and method for eliminating electric echo |
US8295475B2 (en) * | 2006-01-13 | 2012-10-23 | Microsoft Corporation | Selective glitch detection, clock drift compensation, and anti-clipping in audio echo cancellation |
US7831035B2 (en) * | 2006-04-28 | 2010-11-09 | Microsoft Corporation | Integration of a microphone array with acoustic echo cancellation and center clipping |
US7773743B2 (en) * | 2006-04-28 | 2010-08-10 | Microsoft Corporation | Integration of a microphone array with acoustic echo cancellation and residual echo suppression |
US8599704B2 (en) | 2007-01-23 | 2013-12-03 | Microsoft Corporation | Assessing gateway quality using audio systems |
US8090077B2 (en) * | 2007-04-02 | 2012-01-03 | Microsoft Corporation | Testing acoustic echo cancellation and interference in VoIP telephones |
US20080247535A1 (en) * | 2007-04-09 | 2008-10-09 | Microsoft Corporation | Method and apparatus for mitigating impact of nonlinear effects on the quality of audio echo cancellation |
US8259928B2 (en) * | 2007-04-23 | 2012-09-04 | Microsoft Corporation | Method and apparatus for reducing timestamp noise in audio echo cancellation |
US7808407B2 (en) | 2007-06-15 | 2010-10-05 | Solarflare Communications, Inc. | Sub-channel distortion mitigation in parallel digital systems |
US8380253B2 (en) * | 2008-02-15 | 2013-02-19 | Microsoft Corporation | Voice switching for voice communication on computers |
US8310937B2 (en) | 2008-05-28 | 2012-11-13 | Centurylink Intellectual Property Llc | Voice packet dynamic echo cancellation system |
US8369251B2 (en) * | 2008-06-20 | 2013-02-05 | Microsoft Corporation | Timestamp quality assessment for assuring acoustic echo canceller operability |
EP2197190B1 (en) * | 2008-12-12 | 2011-05-04 | Global IP Solutions (GIPS) AB | Delay estimator |
CN103888630A (en) | 2012-12-20 | 2014-06-25 | 杜比实验室特许公司 | Method used for controlling acoustic echo cancellation, and audio processing device |
US9420114B2 (en) * | 2013-08-06 | 2016-08-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Echo canceller for VOIP networks |
US9270830B2 (en) | 2013-08-06 | 2016-02-23 | Telefonaktiebolaget L M Ericsson (Publ) | Echo canceller for VOIP networks |
KR102443637B1 (en) * | 2017-10-23 | 2022-09-16 | 삼성전자주식회사 | Electronic device for determining noise control parameter based on network connection inforiton and operating method thereof |
JP2022110443A (en) * | 2021-01-18 | 2022-07-29 | 東芝テック株式会社 | Server, terminal device, and program for on-line conference |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE68924261T2 (en) * | 1989-06-22 | 1996-03-21 | Ibm | Echo cancellation device with adaptation of the echo cancellation coefficients during full duplex transmission. |
CA2001277C (en) | 1989-10-24 | 1994-07-12 | Bruce Leigh Townsend | Hands free telecommunications apparatus and method |
US5381475A (en) * | 1993-12-02 | 1995-01-10 | At&T Corp. | Arrangement for suppressing echoes in a digital portable telephone |
GB9402210D0 (en) * | 1994-02-04 | 1994-03-30 | British Telecomm | A method of communicating between nodes in a communications network |
CN1232048C (en) * | 1994-05-06 | 2005-12-14 | 株式会社Ntt都科摩 | Echo removing apparatus and echo path estimating method |
JP2842345B2 (en) * | 1995-11-29 | 1999-01-06 | 日本電気株式会社 | Echo canceller |
-
1998
- 1998-09-10 US US09/150,698 patent/US6324170B1/en not_active Expired - Lifetime
-
1999
- 1999-09-02 EP EP99306987A patent/EP0986190B1/en not_active Expired - Lifetime
- 1999-09-02 DE DE69934066T patent/DE69934066T2/en not_active Expired - Lifetime
- 1999-09-09 CA CA002283085A patent/CA2283085C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69934066D1 (en) | 2007-01-04 |
EP0986190B1 (en) | 2006-11-22 |
EP0986190A3 (en) | 2005-02-02 |
CA2283085C (en) | 2007-06-05 |
US6324170B1 (en) | 2001-11-27 |
EP0986190A2 (en) | 2000-03-15 |
DE69934066T2 (en) | 2007-04-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20160909 |