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GB2317535B - Loudspeaking telephone systems - Google Patents

Loudspeaking telephone systems

Info

Publication number
GB2317535B
GB2317535B GB9800665A GB9800665A GB2317535B GB 2317535 B GB2317535 B GB 2317535B GB 9800665 A GB9800665 A GB 9800665A GB 9800665 A GB9800665 A GB 9800665A GB 2317535 B GB2317535 B GB 2317535B
Authority
GB
United Kingdom
Prior art keywords
telephone systems
loudspeaking telephone
loudspeaking
systems
telephone
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.)
Expired - Fee Related
Application number
GB9800665A
Other versions
GB2317535A (en
GB9800665D0 (en
Inventor
David Connolly
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hong Kong Telecommunications HKT Ltd
Original Assignee
Hong Kong Telecommunications HKT Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hong Kong Telecommunications HKT Ltd filed Critical Hong Kong Telecommunications HKT Ltd
Publication of GB9800665D0 publication Critical patent/GB9800665D0/en
Publication of GB2317535A publication Critical patent/GB2317535A/en
Application granted granted Critical
Publication of GB2317535B publication Critical patent/GB2317535B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB9800665A 1995-07-17 1996-07-09 Loudspeaking telephone systems Expired - Fee Related GB2317535B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9514553.8A GB9514553D0 (en) 1995-07-17 1995-07-17 Loudspeaking telephone systems
PCT/GB1996/001641 WO1997004577A1 (en) 1995-07-17 1996-07-09 Loudspeaking telephone systems

Publications (3)

Publication Number Publication Date
GB9800665D0 GB9800665D0 (en) 1998-03-11
GB2317535A GB2317535A (en) 1998-03-25
GB2317535B true GB2317535B (en) 1999-10-13

Family

ID=10777772

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9514553.8A Pending GB9514553D0 (en) 1995-07-17 1995-07-17 Loudspeaking telephone systems
GB9800665A Expired - Fee Related GB2317535B (en) 1995-07-17 1996-07-09 Loudspeaking telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9514553.8A Pending GB9514553D0 (en) 1995-07-17 1995-07-17 Loudspeaking telephone systems

Country Status (3)

Country Link
AU (1) AU6366396A (en)
GB (2) GB9514553D0 (en)
WO (1) WO1997004577A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE512342C2 (en) * 1997-07-11 2000-02-28 Ericsson Telefon Ab L M Procedure and apparatus using mobile phones
AUPP999199A0 (en) * 1999-04-28 1999-05-20 Telstra Corporation Limited Apparatus and method for detecting far end speech
US8457614B2 (en) 2005-04-07 2013-06-04 Clearone Communications, Inc. Wireless multi-unit conference phone
PL2614111T3 (en) 2010-09-10 2018-07-31 Total Research & Technology Feluy Expandable vinyl aromatic polymers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897832A (en) * 1988-01-18 1990-01-30 Oki Electric Industry Co., Ltd. Digital speech interpolation system and speech detector
EP0495423A2 (en) * 1991-01-17 1992-07-22 Siemens Aktiengesellschaft Österreich Device for the multiple use of subscriber lines
US5263079A (en) * 1990-11-30 1993-11-16 Kabushiki Kaisha Toshiba Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes
EP0605960A1 (en) * 1992-12-31 1994-07-13 AT&T Corp. A technique for reducing echoes in conference communications

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897832A (en) * 1988-01-18 1990-01-30 Oki Electric Industry Co., Ltd. Digital speech interpolation system and speech detector
US5263079A (en) * 1990-11-30 1993-11-16 Kabushiki Kaisha Toshiba Dual mode cellular radio communication apparatus having an echo canceller employed in both analog and digital modes
EP0495423A2 (en) * 1991-01-17 1992-07-22 Siemens Aktiengesellschaft Österreich Device for the multiple use of subscriber lines
EP0605960A1 (en) * 1992-12-31 1994-07-13 AT&T Corp. A technique for reducing echoes in conference communications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Proceedings of the IEEE, vol.73, No.4, April 1985, pages 656to 670 *

Also Published As

Publication number Publication date
WO1997004577A1 (en) 1997-02-06
GB2317535A (en) 1998-03-25
GB9800665D0 (en) 1998-03-11
AU6366396A (en) 1997-02-18
GB9514553D0 (en) 1995-09-13

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000709