CA1035450A - Circuits de conference telephonique pour centre de signalisation a multiplexage temporel - Google Patents
Circuits de conference telephonique pour centre de signalisation a multiplexage temporelInfo
- Publication number
- CA1035450A CA1035450A CA223,387A CA223387A CA1035450A CA 1035450 A CA1035450 A CA 1035450A CA 223387 A CA223387 A CA 223387A CA 1035450 A CA1035450 A CA 1035450A
- Authority
- CA
- Canada
- Prior art keywords
- conference call
- signal exchange
- tdm signal
- call circuitry
- circuitry
- 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
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
- H04M3/561—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities by multiplexing
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/475,681 US3983332A (en) | 1974-06-03 | 1974-06-03 | Conference call circuitry for TDM signal exchange |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1035450A true CA1035450A (fr) | 1978-07-25 |
Family
ID=23888645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA223,387A Expired CA1035450A (fr) | 1974-06-03 | 1975-03-25 | Circuits de conference telephonique pour centre de signalisation a multiplexage temporel |
Country Status (7)
Country | Link |
---|---|
US (1) | US3983332A (fr) |
JP (1) | JPS5748912B2 (fr) |
CA (1) | CA1035450A (fr) |
DE (1) | DE2517977C2 (fr) |
FR (1) | FR2273424B1 (fr) |
GB (1) | GB1499179A (fr) |
IT (1) | IT1038271B (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5940341B2 (ja) * | 1977-06-29 | 1984-09-29 | 株式会社東芝 | 時分割交換会議システム |
JPS5457161A (en) * | 1977-10-14 | 1979-05-08 | Hitachi Ltd | Preparation of doughnuttlike coil |
IE47520B1 (en) * | 1977-12-05 | 1984-04-04 | Post Office | Improvements in or relating to audio teleconferencing |
WO1980002095A1 (fr) * | 1979-03-23 | 1980-10-02 | Small World Exchange Inc | Appareil et procede de conference telephonique |
US4305149A (en) * | 1979-03-23 | 1981-12-08 | Small World Exchange, Inc. | Conferencing method and apparatus with multiplexed analog signals |
US4311878A (en) * | 1979-07-02 | 1982-01-19 | Bell Telephone Laboratories, Incorporated | Dialing interval transmission gating arrangement |
FR2498403A1 (fr) * | 1981-01-21 | 1982-07-23 | Telephonie Ind Commerciale | Procede et dispositif de melange de signaux basse frequence transmis par des voies temporelles differentes vers un meme organe telephonique recepteur |
SE449152B (sv) * | 1986-03-19 | 1987-04-06 | Paul Gosta Wilhelm Rosen | Kommunikationsanleggning innefattande ett flertal enheter vilka kan uppretthalla en konferenskoppling |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3293369A (en) * | 1963-12-20 | 1966-12-20 | Ibm | Conference communications system employing time division multiplex |
US3551600A (en) * | 1968-02-23 | 1970-12-29 | Stromberg Carlson Corp | High capacity,high side-tone suppression,4-wire conference circuit |
US3692947A (en) * | 1970-12-21 | 1972-09-19 | Bell Telephone Labor Inc | Time division switching system conference circuit |
US3699264A (en) * | 1971-03-02 | 1972-10-17 | Gte Automatic Electric Lab Inc | Conference circuit for pulse code modulated telephony |
US3835259A (en) * | 1973-03-22 | 1974-09-10 | Bell Telephone Labor Inc | Time division conference hybrid circuit |
US3870819A (en) * | 1973-12-26 | 1975-03-11 | Roderick A Dennis | Conference call apparatus for use with key telephone system equipment |
-
1974
- 1974-06-03 US US05/475,681 patent/US3983332A/en not_active Expired - Lifetime
-
1975
- 1975-03-25 CA CA223,387A patent/CA1035450A/fr not_active Expired
- 1975-04-23 DE DE2517977A patent/DE2517977C2/de not_active Expired
- 1975-04-24 FR FR7513752A patent/FR2273424B1/fr not_active Expired
- 1975-04-25 GB GB17151/75A patent/GB1499179A/en not_active Expired
- 1975-05-20 IT IT23509/75A patent/IT1038271B/it active
- 1975-05-21 JP JP50059780A patent/JPS5748912B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5748912B2 (fr) | 1982-10-19 |
JPS511014A (fr) | 1976-01-07 |
DE2517977C2 (de) | 1983-08-18 |
USB475681I5 (fr) | 1976-01-20 |
GB1499179A (en) | 1978-01-25 |
DE2517977A1 (de) | 1975-12-18 |
FR2273424A1 (fr) | 1975-12-26 |
FR2273424B1 (fr) | 1977-04-15 |
US3983332A (en) | 1976-09-28 |
IT1038271B (it) | 1979-11-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5250105A (en) | Conference telephone system | |
CA1026028A (fr) | Circuit de telephone a haut-parleur | |
CA973984A (en) | Telephone looptest system | |
CA1024279A (fr) | Reseau telephonique pabx a multiplexage electronique par partage du temps | |
GB1415827A (en) | Photomechanical reproduction | |
CA992229A (en) | Conference bridge circuit | |
AU500733B2 (en) | Multistation telephone switching system | |
GB1442238A (en) | Digital conference circuit | |
CA1035450A (fr) | Circuits de conference telephonique pour centre de signalisation a multiplexage temporel | |
GB1439107A (en) | Telephone systems | |
CA1007386A (en) | Slaved pcm clock circuit | |
CA1019484A (en) | Telephone calling signal translating circuitry | |
CA997909A (en) | Telephone booths | |
CA961964A (en) | Call metering for pabx telephone system | |
AU500411B2 (en) | Telephone exchange systems | |
CA1006995A (en) | Hold bridge circuit | |
CA1035479A (fr) | Systeme de chronometrage de communication telephonique | |
CA1016631A (en) | Talking direction finder | |
CA968481A (en) | Two position mounting for telephone sets | |
AU7206474A (en) | Telephone | |
GB1541044A (en) | Pcm tdm telecommunications systems | |
AU473304B2 (en) | Telephone exchange | |
CA1013874A (en) | Line circuit for telecommunications exchange using tdm | |
CA1031445A (fr) | Systeme d'appel d'urgence pour vehicule | |
AU491904B2 (en) | A digital conference circuit |