JPS5444564B2 - - Google Patents
Info
- Publication number
- JPS5444564B2 JPS5444564B2 JP6259575A JP6259575A JPS5444564B2 JP S5444564 B2 JPS5444564 B2 JP S5444564B2 JP 6259575 A JP6259575 A JP 6259575A JP 6259575 A JP6259575 A JP 6259575A JP S5444564 B2 JPS5444564 B2 JP S5444564B2
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US474879A US3885100A (en) | 1974-05-31 | 1974-05-31 | Six-port conference amplifier circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS513503A JPS513503A (ja) | 1976-01-13 |
| JPS5444564B2 true JPS5444564B2 (ja) | 1979-12-26 |
Family
ID=23885317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6259575A Expired JPS5444564B2 (ja) | 1974-05-31 | 1975-05-27 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3885100A (ja) |
| JP (1) | JPS5444564B2 (ja) |
| BE (1) | BE829496A (ja) |
| CA (1) | CA1010167A (ja) |
| DE (1) | DE2523620C3 (ja) |
| FR (1) | FR2275947A1 (ja) |
| GB (1) | GB1505175A (ja) |
| IT (1) | IT1038507B (ja) |
| NL (1) | NL7506454A (ja) |
| SE (1) | SE399501B (ja) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4163871A (en) * | 1977-12-22 | 1979-08-07 | International Telephone And Telegraph Corporation | Digital CVSD telephone conference circuit |
| DE3144267C2 (de) * | 1981-11-07 | 1984-08-30 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Verfahren und Schaltungsanordnung zum Aufbau von Konferenzverbindungen in Fernmeldeanlagen |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS494764A (ja) * | 1972-04-27 | 1974-01-16 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE363032A (ja) * | 1929-06-22 | |||
| US3108157A (en) * | 1959-06-15 | 1963-10-22 | Bell Telephone Labor Inc | Multiple station communication circuit |
| US3527889A (en) * | 1967-03-01 | 1970-09-08 | New North Electric Co | Conference communication system |
| GB1395495A (en) * | 1971-06-30 | 1975-05-29 | Post Office | Telephone conference amplifier |
| US3767861A (en) * | 1972-08-31 | 1973-10-23 | Gte Automatic Electric Lab Inc | 3 to 10 port conference circuit |
| US3824344A (en) * | 1973-03-22 | 1974-07-16 | Bell Telephone Labor Inc | Conference bridge circuit |
-
1974
- 1974-05-31 US US474879A patent/US3885100A/en not_active Expired - Lifetime
- 1974-12-12 CA CA215,819A patent/CA1010167A/en not_active Expired
-
1975
- 1975-05-21 SE SE7505799A patent/SE399501B/xx unknown
- 1975-05-26 BE BE156718A patent/BE829496A/xx unknown
- 1975-05-26 IT IT23722/75A patent/IT1038507B/it active
- 1975-05-27 JP JP6259575A patent/JPS5444564B2/ja not_active Expired
- 1975-05-28 DE DE2523620A patent/DE2523620C3/de not_active Expired
- 1975-05-29 GB GB23390/75A patent/GB1505175A/en not_active Expired
- 1975-05-30 NL NL7506454A patent/NL7506454A/xx not_active Application Discontinuation
- 1975-05-30 FR FR7516989A patent/FR2275947A1/fr active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS494764A (ja) * | 1972-04-27 | 1974-01-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| SE399501B (sv) | 1978-02-13 |
| BE829496A (fr) | 1975-11-26 |
| DE2523620C3 (de) | 1981-09-10 |
| NL7506454A (nl) | 1975-12-02 |
| CA1010167A (en) | 1977-05-10 |
| DE2523620A1 (de) | 1975-12-11 |
| DE2523620B2 (de) | 1980-11-27 |
| FR2275947A1 (fr) | 1976-01-16 |
| JPS513503A (ja) | 1976-01-13 |
| GB1505175A (en) | 1978-03-30 |
| IT1038507B (it) | 1979-11-30 |
| US3885100A (en) | 1975-05-20 |
| FR2275947B1 (ja) | 1977-07-22 |
| SE7505799L (sv) | 1975-12-01 |