SE455749B - Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare - Google Patents

Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare

Info

Publication number
SE455749B
SE455749B SE8605276A SE8605276A SE455749B SE 455749 B SE455749 B SE 455749B SE 8605276 A SE8605276 A SE 8605276A SE 8605276 A SE8605276 A SE 8605276A SE 455749 B SE455749 B SE 455749B
Authority
SE
Sweden
Prior art keywords
current
speaker
line
amplifier
impedance
Prior art date
Application number
SE8605276A
Other languages
English (en)
Swedish (sv)
Other versions
SE8605276L (sv
SE8605276D0 (sv
Inventor
B Berg
L Snith
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE8605276A priority Critical patent/SE455749B/sv
Publication of SE8605276D0 publication Critical patent/SE8605276D0/xx
Priority to US07/209,623 priority patent/US4856057A/en
Priority to PCT/SE1987/000582 priority patent/WO1988004502A1/fr
Priority to JP63500428A priority patent/JP2682686B2/ja
Priority to DE8888900151T priority patent/DE3784164T2/de
Priority to EP88900151A priority patent/EP0294417B1/fr
Priority to KR1019880700808A priority patent/KR930002582B1/ko
Publication of SE8605276L publication Critical patent/SE8605276L/xx
Publication of SE455749B publication Critical patent/SE455749B/sv

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • 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)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
SE8605276A 1986-12-09 1986-12-09 Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare SE455749B (sv)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE8605276A SE455749B (sv) 1986-12-09 1986-12-09 Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare
US07/209,623 US4856057A (en) 1986-12-09 1987-12-08 Apparatus in a loudspeaking telephone set for supplying power to an amplifier connected to the loudspeaker
PCT/SE1987/000582 WO1988004502A1 (fr) 1986-12-09 1987-12-08 Appareil monte sur un telephone a haut-parleur pour alimenter un amplificateur relie au haut-parleur
JP63500428A JP2682686B2 (ja) 1986-12-09 1987-12-08 拡声電話機
DE8888900151T DE3784164T2 (de) 1986-12-09 1987-12-08 Vorrichtung in einem lautsprecher-fernsprechersatz fuer die stromversorgung zu einem verstaerker, verbunden mit dem lautsprecher.
EP88900151A EP0294417B1 (fr) 1986-12-09 1987-12-08 Appareil monte sur un telephone a haut-parleur pour alimenter un amplificateur relie au haut-parleur
KR1019880700808A KR930002582B1 (ko) 1986-12-09 1987-12-08 확성전화기의 확성기에 접속된 증폭기에 전원을 공급하기 위한 장치

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8605276A SE455749B (sv) 1986-12-09 1986-12-09 Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare

Publications (3)

Publication Number Publication Date
SE8605276D0 SE8605276D0 (sv) 1986-12-09
SE8605276L SE8605276L (sv) 1988-06-10
SE455749B true SE455749B (sv) 1988-08-01

Family

ID=20366565

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8605276A SE455749B (sv) 1986-12-09 1986-12-09 Anordning vid en hogtalareforsedd telefonapparat for att effektforsorja en till hogtalaren ansluten hogtalareforsterkare

Country Status (7)

Country Link
US (1) US4856057A (fr)
EP (1) EP0294417B1 (fr)
JP (1) JP2682686B2 (fr)
KR (1) KR930002582B1 (fr)
DE (1) DE3784164T2 (fr)
SE (1) SE455749B (fr)
WO (1) WO1988004502A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1313432C (fr) * 1989-07-06 1993-02-02 Terence Neil Thomas Montage d'excitation de haut-parleur d'appareil telephonique
US5193107A (en) * 1991-09-20 1993-03-09 Harris Corporation Speakerphone test set
FR2686757B1 (fr) * 1992-01-29 1997-03-28 Sgs Thomson Microelectronics Modulateur du courant d'une ligne telephonique.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS596549B2 (ja) * 1979-07-03 1984-02-13 日本電信電話株式会社 電話機用３端子電源回路
GB2064268B (en) * 1979-09-17 1983-10-26 Philips Nv Electronic signalling device for connection to a signal transmission line
DE3429330C2 (de) * 1984-08-09 1986-09-11 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Schaltungsanordnung zur Speisung einer Teilnehmerstation

Also Published As

Publication number Publication date
KR890700291A (ko) 1989-03-11
DE3784164D1 (de) 1993-03-25
SE8605276L (sv) 1988-06-10
SE8605276D0 (sv) 1986-12-09
EP0294417A1 (fr) 1988-12-14
JP2682686B2 (ja) 1997-11-26
JPH01501751A (ja) 1989-06-15
US4856057A (en) 1989-08-08
DE3784164T2 (de) 1993-05-27
EP0294417B1 (fr) 1993-02-10
WO1988004502A1 (fr) 1988-06-16
KR930002582B1 (ko) 1993-04-03

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