DE3575831D1 - Lautfernsprechstation. - Google Patents

Lautfernsprechstation.

Info

Publication number
DE3575831D1
DE3575831D1 DE8585200402T DE3575831T DE3575831D1 DE 3575831 D1 DE3575831 D1 DE 3575831D1 DE 8585200402 T DE8585200402 T DE 8585200402T DE 3575831 T DE3575831 T DE 3575831T DE 3575831 D1 DE3575831 D1 DE 3575831D1
Authority
DE
Germany
Prior art keywords
speaker station
speaker
station
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 - Lifetime
Application number
DE8585200402T
Other languages
English (en)
Inventor
Ian Phillips
Lawrence John Hibberd
Leslie Herbert Williams
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of DE3575831D1 publication Critical patent/DE3575831D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H04M9/087—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 different frequency bands for transmitting and receiving paths ; using phase shifting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
DE8585200402T 1984-03-21 1985-03-18 Lautfernsprechstation. Expired - Lifetime DE3575831D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08407361A GB2156184A (en) 1984-03-21 1984-03-21 Loudspeaking telephone instrument

Publications (1)

Publication Number Publication Date
DE3575831D1 true DE3575831D1 (de) 1990-03-08

Family

ID=10558457

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585200402T Expired - Lifetime DE3575831D1 (de) 1984-03-21 1985-03-18 Lautfernsprechstation.

Country Status (6)

Country Link
US (1) US4748663A (de)
EP (1) EP0155739B1 (de)
JP (1) JPS60214144A (de)
CA (1) CA1230437A (de)
DE (1) DE3575831D1 (de)
GB (1) GB2156184A (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0683305B2 (ja) * 1987-03-12 1994-10-19 日本電気株式会社 拡声電話機
EP0304257A3 (de) * 1987-08-19 1989-09-27 McGregor, Thomas Sprachverstärkungseinrichtung
JPH02288755A (ja) * 1989-04-14 1990-11-28 Telefonbau & Normalzeit Gmbh 電話回線の音声制御減衰方法
US5271057A (en) * 1991-10-09 1993-12-14 Bell Communications Research, Inc. Audio processing system for teleconferencing system
US5434912A (en) * 1993-08-11 1995-07-18 Bell Communications Research, Inc. Audio processing system for point-to-point and multipoint teleconferencing
BR9506302A (pt) * 1994-08-03 1997-08-05 Motorola Inc Sistema de comunicação para acoplar uma pluralidade de terminais de dados a uma primeira rede telefônica
JP2606167B2 (ja) * 1994-12-07 1997-04-30 日本電気株式会社 電話機
US6891809B1 (en) 1999-11-05 2005-05-10 Acoustic Technologies, Inc. Background communication using shadow of audio signal
US6963642B1 (en) 1999-12-30 2005-11-08 Acoustic Technology, Inc. Band-by-band full duplex communication
US20020097861A1 (en) * 2001-01-25 2002-07-25 Acoustic Technologies, Inc. Narrow band shadow encoder
JP2006098534A (ja) * 2004-09-28 2006-04-13 Toyota Motor Corp 音声処理装置及び音声処理方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE505114A (de) * 1950-08-12
DE1083873B (de) * 1958-10-29 1960-06-23 Telefonbau Verfahren zur Verminderung der Aufschwingfaehigkeit rueckkopplungsfaehiger Systeme fuer Hoerfrequenzen
US3022504A (en) * 1960-11-18 1962-02-20 Vincent D Stroud Two-way radio telephone system utilizing frequency subbands to provide transmitter-receiver isolation
US3183304A (en) * 1962-03-07 1965-05-11 Bell Telephone Labor Inc Sound amplification system
GB1207368A (en) * 1966-12-24 1970-09-30 Consiglio Nazionale Ricerche A system and device for selective echo suppression and noise reduction in telephone circuits
US3585311A (en) * 1969-09-02 1971-06-15 Bell Telephone Labor Inc Speech processor using contiguous multiband center-clipping
US3622714A (en) * 1969-09-02 1971-11-23 Bell Telephone Labor Inc Telephonic transmission using complementary comb filters
JPS5567267A (en) * 1978-11-14 1980-05-21 Nec Corp Hand-free telephone set
US4456792A (en) * 1982-11-18 1984-06-26 Bell Telephone Laboratories, Incorporated Voice switching arrangement for telephone conferencing

Also Published As

Publication number Publication date
JPH0319747B2 (de) 1991-03-15
EP0155739A3 (en) 1986-07-16
GB2156184A (en) 1985-10-02
CA1230437A (en) 1987-12-15
US4748663A (en) 1988-05-31
JPS60214144A (ja) 1985-10-26
GB8407361D0 (en) 1984-04-26
EP0155739B1 (de) 1990-01-31
EP0155739A2 (de) 1985-09-25

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee