DE69012839D1 - Lautsprechertreibersystem für Lautsprecher-Telefongerät. - Google Patents

Lautsprechertreibersystem für Lautsprecher-Telefongerät.

Info

Publication number
DE69012839D1
DE69012839D1 DE69012839T DE69012839T DE69012839D1 DE 69012839 D1 DE69012839 D1 DE 69012839D1 DE 69012839 T DE69012839 T DE 69012839T DE 69012839 T DE69012839 T DE 69012839T DE 69012839 D1 DE69012839 D1 DE 69012839D1
Authority
DE
Germany
Prior art keywords
loudspeaker
telephone device
driver system
loudspeaker driver
loudspeaker 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
DE69012839T
Other languages
English (en)
Other versions
DE69012839T2 (de
Inventor
Neil Terence
Marc Bonneville
Douglas Wadsworth
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Application granted granted Critical
Publication of DE69012839D1 publication Critical patent/DE69012839D1/de
Publication of DE69012839T2 publication Critical patent/DE69012839T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
DE69012839T 1989-07-06 1990-04-03 Lautsprechertreibersystem für Lautsprecher-Telefongerät. Expired - Fee Related DE69012839T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000604900A CA1313432C (en) 1989-07-06 1989-07-06 Speaker drive arrangement for loudspeaker telephone
PCT/CA1990/000109 WO1991001069A1 (en) 1989-07-06 1990-04-03 Speaker drive arrangement for loudspeaker telephone

Publications (2)

Publication Number Publication Date
DE69012839D1 true DE69012839D1 (de) 1994-10-27
DE69012839T2 DE69012839T2 (de) 1995-02-16

Family

ID=4140306

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69012839T Expired - Fee Related DE69012839T2 (de) 1989-07-06 1990-04-03 Lautsprechertreibersystem für Lautsprecher-Telefongerät.

Country Status (5)

Country Link
US (1) US5027392A (de)
EP (1) EP0548069B1 (de)
CA (1) CA1313432C (de)
DE (1) DE69012839T2 (de)
WO (1) WO1991001069A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686757B1 (fr) * 1992-01-29 1997-03-28 Sgs Thomson Microelectronics Modulateur du courant d'une ligne telephonique.
US6792296B1 (en) * 2002-10-01 2004-09-14 Motorola, Inc. Portable wireless communication device and methods of configuring same when connected to a vehicle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064268B (en) * 1979-09-17 1983-10-26 Philips Nv Electronic signalling device for connection to a signal transmission line
GB8314134D0 (en) * 1983-05-21 1983-06-29 Mardon Illingworth Tap for liquid container
EP0174942B1 (de) * 1984-02-08 1990-04-11 Patentverwertungs GmbH Lange & Partner Schaltungsanordnung zur elektrischen speisung von einrichtungen in einem fernsprechapparat
GB8523181D0 (en) * 1985-09-19 1985-10-23 Plessey Co Plc Telephone instruments
SE455749B (sv) * 1986-12-09 1988-08-01 Ericsson Telefon Ab L M Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare
DE3743055A1 (de) * 1987-12-18 1989-06-29 Standard Elektrik Lorenz Ag Schaltungsanordnung zur speisung von zusatzschaltungen eines fernsprechapparates

Also Published As

Publication number Publication date
WO1991001069A1 (en) 1991-01-24
CA1313432C (en) 1993-02-02
DE69012839T2 (de) 1995-02-16
EP0548069A1 (de) 1993-06-30
EP0548069B1 (de) 1994-09-21
US5027392A (en) 1991-06-25

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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