CA1027266A - Systeme telephonique multiplex par repartition de frequences - Google Patents
Systeme telephonique multiplex par repartition de frequencesInfo
- Publication number
- CA1027266A CA1027266A CA203,325A CA203325A CA1027266A CA 1027266 A CA1027266 A CA 1027266A CA 203325 A CA203325 A CA 203325A CA 1027266 A CA1027266 A CA 1027266A
- Authority
- CA
- Canada
- Prior art keywords
- frequency division
- telephone system
- division multiplex
- multiplex telephone
- frequency
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/02—Arrangements for interconnection not involving centralised switching involving a common line for all parties
- H04M9/022—Multiplex systems
- H04M9/027—Frequency division multiplex systems
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Time-Division Multiplex Systems (AREA)
- Radio Relay Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US409527A US3864521A (en) | 1973-10-25 | 1973-10-25 | Frequency division multiplex telephone system |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1027266A true CA1027266A (fr) | 1978-02-28 |
Family
ID=23620886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA203,325A Expired CA1027266A (fr) | 1973-10-25 | 1974-06-25 | Systeme telephonique multiplex par repartition de frequences |
Country Status (3)
Country | Link |
---|---|
US (1) | US3864521A (fr) |
CA (1) | CA1027266A (fr) |
GB (1) | GB1476345A (fr) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4020289A (en) * | 1972-05-15 | 1977-04-26 | Teleplex, Inc. | Random access, multiple station communication system |
US4013840A (en) * | 1972-05-15 | 1977-03-22 | Teleplex, Inc. | Tdm and fdm telephone communication |
US4057804A (en) * | 1973-06-21 | 1977-11-08 | Holme Communications Systems, Inc. | Branched path communications apparatus for routing communications signals |
FR2307411A1 (fr) * | 1975-04-11 | 1976-11-05 | Thomson Csf | Poste telephonique a generateur de porteurs programmable et systeme telephonique utilisant un tel poste |
DE2659664C2 (de) * | 1976-12-30 | 1979-04-05 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Nachrichtenübertragungsanordnung zur Verbindung mehrerer Teilnehmer mit einer zentralen Vermittlungsstelle |
US4107471A (en) * | 1977-03-22 | 1978-08-15 | International Telephone & Telegraph Corp. | Frequency division multiplex communications system |
FR2425777A1 (fr) * | 1978-05-12 | 1979-12-07 | Dassault Electronique | Procede et appareil radio-electriques pour la collecte et le traitement d'informations provenant d'une multiplicite de postes |
US4262171A (en) * | 1979-01-08 | 1981-04-14 | Catalyst Research Corporation | Telephone system in which communication between stations is controlled by computers at each individual station |
US4347607A (en) * | 1980-05-09 | 1982-08-31 | Harris Corporation | Voice alarm signalling system |
US4339816A (en) * | 1980-05-29 | 1982-07-13 | International Telephone And Telegraph Corporation | Conferencing apparatus and methods for a frequency division multiplex communications system |
USRE32327E (en) * | 1980-07-07 | 1987-01-06 | Sytek, Inc. | Multiple channel data communication system |
US4365331A (en) * | 1980-07-07 | 1982-12-21 | Sytek Corporation | Multiple channel data communication system |
US4530084A (en) * | 1981-10-08 | 1985-07-16 | Heinrich Hertz Institut Fuer Nachrichten Technik | Communications network with optical channels |
ZA827851B (en) * | 1981-11-04 | 1984-06-27 | Racal Acoustics Ltd | Communication set and method |
US4514594A (en) * | 1982-09-30 | 1985-04-30 | Astech, Inc. | Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability |
US4475193A (en) * | 1982-09-30 | 1984-10-02 | Astech, Inc. | Power line carrier multi telephone extension system for full duplex conferencing between telephones |
FR2548852A1 (fr) * | 1983-07-08 | 1985-01-11 | Drubay Fernand | Reseau de communication de signaux video sous forme analogique |
US4675866A (en) * | 1984-04-24 | 1987-06-23 | Nec Corporation | Broadband network systems |
US4706244A (en) * | 1985-01-15 | 1987-11-10 | Rockwell International Corporation | Frequency multiplexed telephone system |
FR2586874B1 (fr) * | 1985-08-29 | 1988-08-05 | Comp Generale Electricite | Dispositif de telecommunication par fibres optiques. |
FR2593654B1 (fr) * | 1986-01-28 | 1988-03-11 | Comp Generale Electricite | Dispositif de telecommunications photoniques coherentes. |
DE3617830A1 (de) * | 1986-05-26 | 1987-12-03 | Siemens Ag | Schaltungsanordnung fuer ein gesellschaftsleitungssystem |
US4789980A (en) * | 1986-08-18 | 1988-12-06 | American Telephone & Telegraph Company, At&T Bell Laboratories | Switching techniques for FDM communication systems |
US4996709A (en) * | 1988-05-12 | 1991-02-26 | Tandy Corporation | Intercom telephone |
US5530737A (en) * | 1993-03-22 | 1996-06-25 | Phonex Corporation | Secure access telephone extension system and method |
CN1076551C (zh) * | 1993-04-06 | 2001-12-19 | 开创集成系统公司 | 用于在单条内部双绞线上操作的家庭及小公司电话系统 |
US5726978A (en) * | 1995-06-22 | 1998-03-10 | Telefonaktiebolaget L M Ericsson Publ. | Adaptive channel allocation in a frequency division multiplexed system |
US5790516A (en) * | 1995-07-14 | 1998-08-04 | Telefonaktiebolaget Lm Ericsson | Pulse shaping for data transmission in an orthogonal frequency division multiplexed system |
US6049549A (en) * | 1997-08-14 | 2000-04-11 | University Of Massachusetts | Adaptive media control |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3045066A (en) * | 1957-03-14 | 1962-07-17 | Donald A Beuscher | Selective carrier type communication system |
US2927966A (en) * | 1957-09-27 | 1960-03-08 | Bell Telephone Labor Inc | Carrier telephone systems with carrier-shift signaling |
US3597549A (en) * | 1969-07-17 | 1971-08-03 | Bell Telephone Labor Inc | High speed data communication system |
US3757053A (en) * | 1971-09-10 | 1973-09-04 | Delta Communications Corp | Time multiplexed sampled data telephone system |
US3809815A (en) * | 1972-05-04 | 1974-05-07 | Litton Systems Inc | Communication system utilizing frequency division multiplexing to link a plurality of stations each containing a switchable synthesizer |
US3781478A (en) * | 1972-07-07 | 1973-12-25 | Bell Telephone Labor Inc | Multiplex communication system |
-
1973
- 1973-10-25 US US409527A patent/US3864521A/en not_active Expired - Lifetime
-
1974
- 1974-06-24 GB GB2793774A patent/GB1476345A/en not_active Expired
- 1974-06-25 CA CA203,325A patent/CA1027266A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3864521A (en) | 1975-02-04 |
GB1476345A (en) | 1977-06-10 |
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