FR2363247A1 - Equipement terminal pour un systeme multiplex telephonique a courants porteurs - Google Patents
Equipement terminal pour un systeme multiplex telephonique a courants porteursInfo
- Publication number
- FR2363247A1 FR2363247A1 FR7625577A FR7625577A FR2363247A1 FR 2363247 A1 FR2363247 A1 FR 2363247A1 FR 7625577 A FR7625577 A FR 7625577A FR 7625577 A FR7625577 A FR 7625577A FR 2363247 A1 FR2363247 A1 FR 2363247A1
- Authority
- FR
- France
- Prior art keywords
- terminal equipment
- telephone system
- modem
- carrier currents
- multiplex
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/02—Selecting arrangements for multiplex systems for frequency-division multiplexing
-
- 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)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Telephonic Communication Services (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Bidirectional Digital Transmission (AREA)
Abstract
L'invention se réfère à l'équipement terminal pour un système multiplex à courant porteur, avec un semi-suppresseur d'écho et un modem de voie. Selon l'invention, l'atténuateur qui est inséré dans la chaîne émission est disposé derrière un premier étage de modulation, ce qui permet d'exploiter le temps de propagation des filtres du modem pour la réaction d'intervention de l'atténuateur. Application : modem de voies du groupe primaire en multiplex de fréquences téléphoniques.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7625577A FR2363247A1 (fr) | 1976-08-24 | 1976-08-24 | Equipement terminal pour un systeme multiplex telephonique a courants porteurs |
GB32124/77A GB1534470A (en) | 1976-08-24 | 1977-08-01 | Terminal equipment for a multiplex carrier current telephone system |
US05/821,218 US4130743A (en) | 1976-08-24 | 1977-08-02 | Terminal equipment for a multiplex carrier current telephone system |
DE19772737082 DE2737082A1 (de) | 1976-08-24 | 1977-08-17 | Endeinrichtung fuer ein multiplextelefonsystem mit traegerstroemen |
JP9830577A JPS5326608A (en) | 1976-08-24 | 1977-08-18 | Terminal station for carrier telephone multiplex system |
NL7709172A NL7709172A (nl) | 1976-08-24 | 1977-08-18 | Terminaluitrusting voor een multiplex-telefoon- stelsel met draaggolven. |
SE7709461A SE428622B (sv) | 1976-08-24 | 1977-08-23 | Avslutningsutrustning for ett berfrekvens-telefonsystem |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7625577A FR2363247A1 (fr) | 1976-08-24 | 1976-08-24 | Equipement terminal pour un systeme multiplex telephonique a courants porteurs |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2363247A1 true FR2363247A1 (fr) | 1978-03-24 |
FR2363247B1 FR2363247B1 (fr) | 1981-03-06 |
Family
ID=9177096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7625577A Granted FR2363247A1 (fr) | 1976-08-24 | 1976-08-24 | Equipement terminal pour un systeme multiplex telephonique a courants porteurs |
Country Status (7)
Country | Link |
---|---|
US (1) | US4130743A (fr) |
JP (1) | JPS5326608A (fr) |
DE (1) | DE2737082A1 (fr) |
FR (1) | FR2363247A1 (fr) |
GB (1) | GB1534470A (fr) |
NL (1) | NL7709172A (fr) |
SE (1) | SE428622B (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4644108A (en) * | 1982-10-27 | 1987-02-17 | International Business Machines Corporation | Adaptive sub-band echo suppressor |
GB2139054B (en) * | 1983-04-22 | 1986-09-24 | Gen Electric Co Plc | Loudspeaking telephone instruments |
US7113750B2 (en) * | 2002-12-16 | 2006-09-26 | Tektronix, Inc. | Apparatus and method for input channel isolation within an electronic test instrument |
CN100442059C (zh) * | 2004-05-21 | 2008-12-10 | 特克特朗尼克公司 | 在电子测试仪器中用于将输入信道隔离的装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2251028A (en) * | 1940-09-28 | 1941-07-29 | Bell Telephone Labor Inc | Control of transmission in two-way signal wave transmission systems |
US2258966A (en) * | 1940-10-12 | 1941-10-14 | Bell Telephone Labor Inc | Control of transmission in two-way signaling systems |
US2295153A (en) * | 1941-06-10 | 1942-09-08 | Bell Telephone Labor Inc | Two-way signal transmission system |
US3397401A (en) * | 1966-05-27 | 1968-08-13 | Hughes Aircraft Co | Voice operated communication system |
US3896273A (en) * | 1971-01-08 | 1975-07-22 | Communications Satellite Corp | Digital echo suppressor |
IT1030881B (it) * | 1973-12-10 | 1979-04-10 | Cit Alcatel | Semi soppressore di eco per un terminale di una linea elettrica a quattro fili |
US3942116A (en) * | 1975-03-13 | 1976-03-02 | California Microwave, Inc. | Transceiver having improved voice actuated carrier and echo suppression circuit |
-
1976
- 1976-08-24 FR FR7625577A patent/FR2363247A1/fr active Granted
-
1977
- 1977-08-01 GB GB32124/77A patent/GB1534470A/en not_active Expired
- 1977-08-02 US US05/821,218 patent/US4130743A/en not_active Expired - Lifetime
- 1977-08-17 DE DE19772737082 patent/DE2737082A1/de not_active Withdrawn
- 1977-08-18 JP JP9830577A patent/JPS5326608A/ja active Pending
- 1977-08-18 NL NL7709172A patent/NL7709172A/xx not_active Application Discontinuation
- 1977-08-23 SE SE7709461A patent/SE428622B/xx unknown
Also Published As
Publication number | Publication date |
---|---|
JPS5326608A (en) | 1978-03-11 |
US4130743A (en) | 1978-12-19 |
GB1534470A (en) | 1978-12-06 |
NL7709172A (nl) | 1978-02-28 |
SE428622B (sv) | 1983-07-11 |
FR2363247B1 (fr) | 1981-03-06 |
SE7709461L (sv) | 1978-02-25 |
DE2737082A1 (de) | 1978-03-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |