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 hogtalareforsterkareInfo
- 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
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)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
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 |
JP63500428A JP2682686B2 (ja) | 1986-12-09 | 1987-12-08 | 拡声電話機 |
PCT/SE1987/000582 WO1988004502A1 (en) | 1986-12-09 | 1987-12-08 | Apparatus in a loudspeaking telephone set for supplying power to an amplifier connected to the loudspeaker |
KR1019880700808A KR930002582B1 (ko) | 1986-12-09 | 1987-12-08 | 확성전화기의 확성기에 접속된 증폭기에 전원을 공급하기 위한 장치 |
EP88900151A EP0294417B1 (de) | 1986-12-09 | 1987-12-08 | Vorrichtung in einem lautsprecher-fernsprechersatz für die stromversorgung zu einem verstärker, verbunden mit dem lautsprecher |
DE8888900151T DE3784164T2 (de) | 1986-12-09 | 1987-12-08 | Vorrichtung in einem lautsprecher-fernsprechersatz fuer die stromversorgung zu einem verstaerker, verbunden mit dem lautsprecher. |
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 (de) |
EP (1) | EP0294417B1 (de) |
JP (1) | JP2682686B2 (de) |
KR (1) | KR930002582B1 (de) |
DE (1) | DE3784164T2 (de) |
SE (1) | SE455749B (de) |
WO (1) | WO1988004502A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1313432C (en) * | 1989-07-06 | 1993-02-02 | Terence Neil Thomas | Speaker drive arrangement for loudspeaker telephone |
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)
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 |
-
1986
- 1986-12-09 SE SE8605276A patent/SE455749B/sv not_active IP Right Cessation
-
1987
- 1987-12-08 EP EP88900151A patent/EP0294417B1/de not_active Expired - Lifetime
- 1987-12-08 DE DE8888900151T patent/DE3784164T2/de not_active Expired - Lifetime
- 1987-12-08 WO PCT/SE1987/000582 patent/WO1988004502A1/en active IP Right Grant
- 1987-12-08 US US07/209,623 patent/US4856057A/en not_active Expired - Lifetime
- 1987-12-08 JP JP63500428A patent/JP2682686B2/ja not_active Expired - Fee Related
- 1987-12-08 KR KR1019880700808A patent/KR930002582B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE8605276L (sv) | 1988-06-10 |
KR930002582B1 (ko) | 1993-04-03 |
JP2682686B2 (ja) | 1997-11-26 |
DE3784164T2 (de) | 1993-05-27 |
DE3784164D1 (de) | 1993-03-25 |
EP0294417B1 (de) | 1993-02-10 |
EP0294417A1 (de) | 1988-12-14 |
KR890700291A (ko) | 1989-03-11 |
WO1988004502A1 (en) | 1988-06-16 |
JPH01501751A (ja) | 1989-06-15 |
US4856057A (en) | 1989-08-08 |
SE8605276D0 (sv) | 1986-12-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAL | Patent in force |
Ref document number: 8605276-8 Format of ref document f/p: F |
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NUG | Patent has lapsed |