DE3867654D1 - Anti-larsen-pegelregelungsanordnung in einem verstaerker eines fernsprechapparats. - Google Patents

Anti-larsen-pegelregelungsanordnung in einem verstaerker eines fernsprechapparats.

Info

Publication number
DE3867654D1
DE3867654D1 DE8888200355T DE3867654T DE3867654D1 DE 3867654 D1 DE3867654 D1 DE 3867654D1 DE 8888200355 T DE8888200355 T DE 8888200355T DE 3867654 T DE3867654 T DE 3867654T DE 3867654 D1 DE3867654 D1 DE 3867654D1
Authority
DE
Germany
Prior art keywords
larsen
amplifier
level control
telephone set
control arrangement
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
DE8888200355T
Other languages
English (en)
Inventor
Jean-Pierre Societe Coulmance
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 DE3867654D1 publication Critical patent/DE3867654D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)
DE8888200355T 1987-02-27 1988-02-25 Anti-larsen-pegelregelungsanordnung in einem verstaerker eines fernsprechapparats. Expired - Lifetime DE3867654D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8702660A FR2611408B1 (fr) 1987-02-27 1987-02-27 Circuit de commande d e gain d'un amplificateur d'ecoute par haut-parleur pour la suppression de l'effet larsen

Publications (1)

Publication Number Publication Date
DE3867654D1 true DE3867654D1 (de) 1992-02-27

Family

ID=9348420

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8888200355T Expired - Lifetime DE3867654D1 (de) 1987-02-27 1988-02-25 Anti-larsen-pegelregelungsanordnung in einem verstaerker eines fernsprechapparats.

Country Status (6)

Country Link
US (1) US4835484A (de)
EP (1) EP0280381B1 (de)
JP (1) JPH0716216B2 (de)
KR (1) KR960011067B1 (de)
DE (1) DE3867654D1 (de)
FR (1) FR2611408B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371803A (en) * 1990-08-31 1994-12-06 Bellsouth Corporation Tone reduction circuit for headsets
US5369711A (en) * 1990-08-31 1994-11-29 Bellsouth Corporation Automatic gain control for a headset
US5444867A (en) * 1991-01-11 1995-08-22 Kabushiki Kaisha Toshiba Adapter unit for adaptively supplying a portable radio telephone with power
JP3058923B2 (ja) * 1991-01-11 2000-07-04 株式会社東芝 無線電話装置アダプタ
JPH04239251A (ja) * 1991-01-11 1992-08-27 Toshiba Corp 無線電話装置アダプタ
US5701352A (en) * 1994-07-14 1997-12-23 Bellsouth Corporation Tone suppression automatic gain control for a headset
US11589154B1 (en) * 2021-08-25 2023-02-21 Bose Corporation Wearable audio device zero-crossing based parasitic oscillation detection

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346261A (en) * 1980-03-17 1982-08-24 United Networks, Inc. Speaker phones
CA1186826A (en) * 1981-03-18 1985-05-07 Jin H. Yun Loudspeaker telephone system
DE3148305A1 (de) * 1981-12-03 1983-06-09 Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin Schaltungsanordnung fuer eine freisprecheinrichtung
FR2518854B1 (fr) * 1981-12-18 1986-08-08 Thomson Csf Mat Tel Poste telephonique a amplificateurs de parole
FR2537810A1 (fr) * 1982-12-14 1984-06-15 Thomson Csf Poste telephonique a ecoute amplifiee muni d'un dispositif antilarsen
US4542263A (en) * 1984-03-07 1985-09-17 Oki Electric Industry Co., Ltd. Speech control circuit

Also Published As

Publication number Publication date
EP0280381B1 (de) 1992-01-15
FR2611408A1 (fr) 1988-09-02
KR880010566A (ko) 1988-10-10
FR2611408B1 (fr) 1989-05-26
JPS63227242A (ja) 1988-09-21
EP0280381A1 (de) 1988-08-31
US4835484A (en) 1989-05-30
KR960011067B1 (ko) 1996-08-16
JPH0716216B2 (ja) 1995-02-22

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: PHILIPS ELECTRONICS N.V., EINDHOVEN, NL

8327 Change in the person/name/address of the patent owner

Owner name: KONINKLIJKE PHILIPS ELECTRONICS N.V., EINDHOVEN, N

8339 Ceased/non-payment of the annual fee