JPS5748912B2 - - Google Patents
Info
- Publication number
- JPS5748912B2 JPS5748912B2 JP50059780A JP5978075A JPS5748912B2 JP S5748912 B2 JPS5748912 B2 JP S5748912B2 JP 50059780 A JP50059780 A JP 50059780A JP 5978075 A JP5978075 A JP 5978075A JP S5748912 B2 JPS5748912 B2 JP S5748912B2
- Authority
- JP
- Japan
- 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
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 (2)
| Publication Number | Publication Date |
|---|---|
| JPS511014A JPS511014A (ja) | 1976-01-07 |
| JPS5748912B2 true JPS5748912B2 (ja) | 1982-10-19 |
Family
ID=23888645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50059780A Expired JPS5748912B2 (ja) | 1974-06-03 | 1975-05-21 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3983332A (ja) |
| JP (1) | JPS5748912B2 (ja) |
| CA (1) | CA1035450A (ja) |
| DE (1) | DE2517977C2 (ja) |
| FR (1) | FR2273424B1 (ja) |
| GB (1) | GB1499179A (ja) |
| IT (1) | IT1038271B (ja) |
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 |
| EP0002378B1 (en) * | 1977-12-05 | 1981-10-14 | The Post Office | A control unit for establishing a four-wire link via a pair of telephone lines |
| WO1980002095A1 (en) * | 1979-03-23 | 1980-10-02 | Small World Exchange Inc | Telephone-conferencing apparatus and method |
| 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/en 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 |
|---|---|
| US3983332A (en) | 1976-09-28 |
| DE2517977A1 (de) | 1975-12-18 |
| CA1035450A (en) | 1978-07-25 |
| IT1038271B (it) | 1979-11-20 |
| JPS511014A (ja) | 1976-01-07 |
| DE2517977C2 (de) | 1983-08-18 |
| FR2273424A1 (ja) | 1975-12-26 |
| USB475681I5 (ja) | 1976-01-20 |
| FR2273424B1 (ja) | 1977-04-15 |
| GB1499179A (en) | 1978-01-25 |