FR2357102A1 - Amplificateur pour ligne telephonique a deux fils - Google Patents
Amplificateur pour ligne telephonique a deux filsInfo
- Publication number
- FR2357102A1 FR2357102A1 FR7719648A FR7719648A FR2357102A1 FR 2357102 A1 FR2357102 A1 FR 2357102A1 FR 7719648 A FR7719648 A FR 7719648A FR 7719648 A FR7719648 A FR 7719648A FR 2357102 A1 FR2357102 A1 FR 2357102A1
- Authority
- FR
- France
- Prior art keywords
- telephone line
- line amplifier
- wire telephone
- signals
- telephony
- 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.)
- Granted
Links
- 208000032041 Hearing impaired Diseases 0.000 abstract 1
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 230000002146 bilateral effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
Classifications
-
- 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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
- Bidirectional Digital Transmission (AREA)
Abstract
L'invention concerne le domaine de la téléphonie. Un convertisseur de puissance 1 et un détecteur de seuil directionnel 2 sont associés dans une ligne de transmission téléphonique bidirectionnelle à deux fils, pour constituer un amplificateur bilatéral capable d'appliquer un gain au signal correspondant au sens de propagation dominant, et une atténuation égale aux signaux qui se propagent dans l'autre sens, sans séparer les différents signaux. Application aux postes téléphoniques pour malentendants.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/700,325 US4065646A (en) | 1976-06-28 | 1976-06-28 | Power converter |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2357102A1 true FR2357102A1 (fr) | 1978-01-27 |
FR2357102B1 FR2357102B1 (fr) | 1981-07-24 |
Family
ID=24813084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7719648A Granted FR2357102A1 (fr) | 1976-06-28 | 1977-06-27 | Amplificateur pour ligne telephonique a deux fils |
Country Status (8)
Country | Link |
---|---|
US (1) | US4065646A (fr) |
JP (1) | JPS533016A (fr) |
AU (1) | AU516783B2 (fr) |
CA (1) | CA1078536A (fr) |
DE (1) | DE2728854A1 (fr) |
FR (1) | FR2357102A1 (fr) |
GB (1) | GB1527839A (fr) |
SE (1) | SE423772B (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5570625U (fr) * | 1978-11-07 | 1980-05-15 | ||
JPS6357926A (ja) * | 1986-10-15 | 1988-03-12 | Tenryu Marusawa Kk | 逆作動電磁スプリングクラツチ |
US5907538A (en) * | 1997-02-18 | 1999-05-25 | White; Donald R. | Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input |
US7072476B2 (en) * | 1997-02-18 | 2006-07-04 | Matech, Inc. | Audio headset |
US7881483B2 (en) * | 2003-11-11 | 2011-02-01 | Matech, Inc. | Two-way communications device having a single transducer |
WO2005048574A1 (fr) * | 2003-11-11 | 2005-05-26 | Matech, Inc. | Dispositif de communication sans fil a commutation automatique |
US8315379B2 (en) * | 2004-11-10 | 2012-11-20 | Matech, Inc. | Single transducer full duplex talking circuit |
US8923508B2 (en) * | 2012-06-07 | 2014-12-30 | Lsi Corporation | Half-duplex speakerphone echo canceler |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1029163A (en) * | 1964-05-29 | 1966-05-11 | Standard Telephones Cables Ltd | Improvements in or relating to telephone sets |
US3359378A (en) * | 1964-09-28 | 1967-12-19 | Sanders Associates Inc | Two-way amplifier |
US3706862A (en) * | 1971-06-28 | 1972-12-19 | Lorain Prod Corp | Amplifier circuit for transmission lines |
JPS5226972B2 (fr) * | 1973-07-28 | 1977-07-18 | ||
US3989906A (en) * | 1975-03-20 | 1976-11-02 | Lorain Products Corporation | Repeater for transmission lines |
-
1976
- 1976-06-28 US US05/700,325 patent/US4065646A/en not_active Expired - Lifetime
-
1977
- 1977-05-30 CA CA279,474A patent/CA1078536A/fr not_active Expired
- 1977-06-16 SE SE7706985A patent/SE423772B/xx unknown
- 1977-06-21 GB GB25805/77A patent/GB1527839A/en not_active Expired
- 1977-06-23 AU AU26369/77A patent/AU516783B2/en not_active Expired
- 1977-06-27 FR FR7719648A patent/FR2357102A1/fr active Granted
- 1977-06-27 DE DE19772728854 patent/DE2728854A1/de not_active Withdrawn
- 1977-06-28 JP JP7621877A patent/JPS533016A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
SE7706985L (sv) | 1977-12-29 |
AU516783B2 (en) | 1981-06-25 |
DE2728854A1 (de) | 1978-01-05 |
GB1527839A (en) | 1978-10-11 |
JPS533016A (en) | 1978-01-12 |
US4065646A (en) | 1977-12-27 |
FR2357102B1 (fr) | 1981-07-24 |
SE423772B (sv) | 1982-05-24 |
AU2636977A (en) | 1979-01-04 |
CA1078536A (fr) | 1980-05-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |