FI750378A - - Google Patents
Info
- Publication number
- FI750378A FI750378A FI750378A FI750378A FI750378A FI 750378 A FI750378 A FI 750378A FI 750378 A FI750378 A FI 750378A FI 750378 A FI750378 A FI 750378A FI 750378 A FI750378 A FI 750378A
- Authority
- FI
- Finland
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
- H04M1/585—Anti-side-tone circuits implemented without inductive element
-
- 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)
- Interface Circuits In Exchanges (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7402901A SE380699B (sv) | 1974-03-05 | 1974-03-05 | Elektronisk talkrets for en centralbatterimatad telefonapparat. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FI750378A true FI750378A (US20070244113A1-20071018-C00087.png) | 1975-09-06 |
Family
ID=20320413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI750378A FI750378A (US20070244113A1-20071018-C00087.png) | 1974-03-05 | 1975-02-12 |
Country Status (12)
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1546046A (en) * | 1976-12-03 | 1979-05-16 | Cselt Centro Studi Lab Telecom | Transmitting and receiving circuit for subscriber telephone sets |
| US4163878A (en) * | 1977-09-07 | 1979-08-07 | Wescom, Inc. | Electronic hybrid and hybrid repeater with bridge circuit |
| US4192978A (en) * | 1978-02-27 | 1980-03-11 | Vincent Ogden W | Operational amplifier hybrid system |
| US4718083A (en) * | 1985-09-23 | 1988-01-05 | Gte Communication Systems Corporation | Differential receive booster amplifier for telephone instruments |
| JP2734265B2 (ja) * | 1991-12-12 | 1998-03-30 | 日本電気株式会社 | エレクトレット・コンデンサ・マイクロフォン用増幅回路 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3462560A (en) * | 1966-04-06 | 1969-08-19 | Bell Telephone Labor Inc | Subscriber telephone circuit with resistance hybrid sidetone balancing network |
| DE1919111B1 (de) * | 1969-04-15 | 1970-10-29 | Siemens Ag | Schaltungsanordnung fuer einen Transistorhoerverstaerker mit Daempfungsausgleich in Fernsprechteilnehmerstellen |
| JPS5148006B1 (US20070244113A1-20071018-C00087.png) * | 1970-09-03 | 1976-12-18 |
-
1974
- 1974-03-05 SE SE7402901A patent/SE380699B/xx unknown
-
1975
- 1975-02-12 FI FI750378A patent/FI750378A/fi not_active Application Discontinuation
- 1975-02-13 US US05/549,664 patent/US3974344A/en not_active Expired - Lifetime
- 1975-02-19 GB GB7081/75A patent/GB1493869A/en not_active Expired
- 1975-02-21 NL NL7502112A patent/NL7502112A/xx not_active Application Discontinuation
- 1975-02-24 BR BR1102/75A patent/BR7501102A/pt unknown
- 1975-03-04 DK DK86475AA patent/DK139600B/da unknown
- 1975-03-04 NO NO750717A patent/NO134855C/no unknown
- 1975-03-04 FR FR7506668A patent/FR2263648B1/fr not_active Expired
- 1975-03-04 ES ES435269A patent/ES435269A1/es not_active Expired
- 1975-03-05 CA CA221,338A patent/CA1011479A/en not_active Expired
- 1975-03-05 IT IT20931/75A patent/IT1033427B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| NO134855C (US20070244113A1-20071018-C00087.png) | 1976-12-29 |
| DK86475A (US20070244113A1-20071018-C00087.png) | 1975-11-03 |
| ES435269A1 (es) | 1976-12-16 |
| IT1033427B (it) | 1979-07-10 |
| CA1011479A (en) | 1977-05-31 |
| SE7402901L (US20070244113A1-20071018-C00087.png) | 1975-09-08 |
| DK139600B (da) | 1979-03-12 |
| BR7501102A (pt) | 1975-12-02 |
| SE380699B (sv) | 1975-11-10 |
| NL7502112A (nl) | 1975-09-09 |
| DK139600C (US20070244113A1-20071018-C00087.png) | 1979-08-27 |
| FR2263648A1 (US20070244113A1-20071018-C00087.png) | 1975-10-03 |
| GB1493869A (en) | 1977-11-30 |
| NO134855B (US20070244113A1-20071018-C00087.png) | 1976-09-13 |
| US3974344A (en) | 1976-08-10 |
| FR2263648B1 (US20070244113A1-20071018-C00087.png) | 1979-03-02 |
| NO750717L (US20070244113A1-20071018-C00087.png) | 1975-09-08 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FA | Application withdrawn |
Owner name: OY L M ERICSSON AB |