JPS54136208A - Telephone exchanger - Google Patents
Telephone exchangerInfo
- Publication number
- JPS54136208A JPS54136208A JP4399978A JP4399978A JPS54136208A JP S54136208 A JPS54136208 A JP S54136208A JP 4399978 A JP4399978 A JP 4399978A JP 4399978 A JP4399978 A JP 4399978A JP S54136208 A JPS54136208 A JP S54136208A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- meeting
- circuit
- attenuation
- reception
- 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
- 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
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53043999A JPS5919506B2 (ja) | 1978-04-14 | 1978-04-14 | 電話交換機 |
US06/025,585 US4276639A (en) | 1978-04-14 | 1979-03-30 | Telephone exchange with time shared speech paths and selectively attenuated speech signals |
CA000325537A CA1117636A (en) | 1978-04-14 | 1979-04-11 | Telephone exchange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53043999A JPS5919506B2 (ja) | 1978-04-14 | 1978-04-14 | 電話交換機 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54136208A true JPS54136208A (en) | 1979-10-23 |
JPS5919506B2 JPS5919506B2 (ja) | 1984-05-07 |
Family
ID=12679402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53043999A Expired JPS5919506B2 (ja) | 1978-04-14 | 1978-04-14 | 電話交換機 |
Country Status (3)
Country | Link |
---|---|
US (1) | US4276639A (ja) |
JP (1) | JPS5919506B2 (ja) |
CA (1) | CA1117636A (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57133754A (en) * | 1981-02-12 | 1982-08-18 | Nippon Telegr & Teleph Corp <Ntt> | Conference telephone set |
JPS57206191A (en) * | 1981-04-23 | 1982-12-17 | Western Electric Co | Memory buffer |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4499578A (en) * | 1982-05-27 | 1985-02-12 | At&T Bell Laboratories | Method and apparatus for controlling signal level in a digital conference arrangement |
GB2137049B (en) * | 1983-03-15 | 1986-05-14 | Standard Telephones Cables Ltd | Handsfree telephone |
US4541087A (en) * | 1983-06-27 | 1985-09-10 | Confertech International, Inc. | Digital teleconferencing control device, system and method |
US4603417A (en) * | 1984-10-09 | 1986-07-29 | Hitachi, Ltd. | PCM coder and decoder |
US4797877A (en) * | 1986-12-18 | 1989-01-10 | American Telephone And Telegraph Company | Communication system dynamic conferencer circuit |
JPH01243767A (ja) * | 1988-03-25 | 1989-09-28 | Toshiba Corp | 会議通話方式 |
CA2143591C (en) | 1994-04-29 | 1999-01-26 | David N. Horn | Teleconferencing audio bridge |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50128905A (ja) * | 1974-03-22 | 1975-10-11 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3761624A (en) * | 1972-07-31 | 1973-09-25 | Bell Telephone Labor Inc | Time division signal transfer network |
US4024349A (en) * | 1976-04-22 | 1977-05-17 | Bell Telephone Laboratories, Incorporated | Quasi-resonant transfer conferencing circuit |
-
1978
- 1978-04-14 JP JP53043999A patent/JPS5919506B2/ja not_active Expired
-
1979
- 1979-03-30 US US06/025,585 patent/US4276639A/en not_active Expired - Lifetime
- 1979-04-11 CA CA000325537A patent/CA1117636A/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50128905A (ja) * | 1974-03-22 | 1975-10-11 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57133754A (en) * | 1981-02-12 | 1982-08-18 | Nippon Telegr & Teleph Corp <Ntt> | Conference telephone set |
JPH028508B2 (ja) * | 1981-02-12 | 1990-02-26 | Nippon Telegraph & Telephone | |
JPS57206191A (en) * | 1981-04-23 | 1982-12-17 | Western Electric Co | Memory buffer |
JPH0277959U (ja) * | 1981-04-23 | 1990-06-14 | ||
JPH0537573Y2 (ja) * | 1981-04-23 | 1993-09-22 |
Also Published As
Publication number | Publication date |
---|---|
JPS5919506B2 (ja) | 1984-05-07 |
US4276639A (en) | 1981-06-30 |
CA1117636A (en) | 1982-02-02 |
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