IT1242169B - Sistema telefonico a tasti. - Google Patents
Sistema telefonico a tasti.Info
- Publication number
- IT1242169B IT1242169B IT48506A IT4850690A IT1242169B IT 1242169 B IT1242169 B IT 1242169B IT 48506 A IT48506 A IT 48506A IT 4850690 A IT4850690 A IT 4850690A IT 1242169 B IT1242169 B IT 1242169B
- Authority
- IT
- Italy
- Prior art keywords
- key system
- telephone key
- telephone
- key
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
- H04M9/008—Multiplex systems
-
- 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
- H04M3/20—Automatic or semi-automatic exchanges with means for interrupting existing connections; with means for breaking-in on conversations
-
- 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
- H04M3/568—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities audio processing specific to telephonic conferencing, e.g. spatial distribution, mixing of participants
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Telephonic Communication Services (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1307022A JPH03166894A (ja) | 1989-11-27 | 1989-11-27 | ボタン電話装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
IT9048506A0 IT9048506A0 (it) | 1990-11-22 |
IT9048506A1 IT9048506A1 (it) | 1991-05-28 |
IT1242169B true IT1242169B (it) | 1994-02-16 |
Family
ID=17964085
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT48506A IT1242169B (it) | 1989-11-27 | 1990-11-22 | Sistema telefonico a tasti. |
Country Status (4)
Country | Link |
---|---|
US (1) | US5128989A (it) |
JP (1) | JPH03166894A (it) |
GB (1) | GB2239580B (it) |
IT (1) | IT1242169B (it) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5857017A (en) * | 1990-10-12 | 1999-01-05 | Canon Kabushiki Kaisha | Call waiting notifying apparatus |
EP0515703B1 (en) * | 1991-04-26 | 1997-01-08 | Alcatel SEL Aktiengesellschaft | Broadband conference system |
JPH0698031A (ja) * | 1992-09-14 | 1994-04-08 | Fujitsu Ltd | ディジタル会議トランクシステム |
CA2110943A1 (en) * | 1993-12-08 | 1995-06-09 | R. William Taylor | Secure whisper call announcement |
US5483588A (en) * | 1994-12-23 | 1996-01-09 | Latitute Communications | Voice processing interface for a teleconference system |
AU1433000A (en) * | 1998-11-30 | 2000-06-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Isolated connection in a multiparty call |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4224688A (en) * | 1978-10-30 | 1980-09-23 | Northern Telecom Limited | Digital conference circuit |
DE3005162A1 (de) * | 1980-02-12 | 1981-08-20 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zur einspeisung von hoertoenen in konferenzverbindungen |
US4388717A (en) * | 1981-01-14 | 1983-06-14 | International Telephone And Telegraph Corporation | Conference circuit for PCM system |
IT1211024B (it) * | 1981-04-16 | 1989-09-29 | Italtel Spa | Circuito conferenza per centrali telefoniche di commutazione di tipo numerico. |
US4389720A (en) * | 1981-04-23 | 1983-06-21 | Bell Telephone Laboratories, Incorporated | Distributed digital conferencing system |
GB2128448B (en) * | 1982-10-08 | 1985-11-13 | Standard Telephones Cables Ltd | Telephone exchange conference circuit |
GB2157129A (en) * | 1984-04-06 | 1985-10-16 | Standard Telephones Cables Ltd | Conference circuit |
JPS6126357A (ja) * | 1984-07-17 | 1986-02-05 | Nitsuko Ltd | 割込機能を有する電話システム |
-
1989
- 1989-11-27 JP JP1307022A patent/JPH03166894A/ja active Pending
-
1990
- 1990-11-16 US US07/614,127 patent/US5128989A/en not_active Expired - Lifetime
- 1990-11-20 GB GB9025262A patent/GB2239580B/en not_active Expired - Fee Related
- 1990-11-22 IT IT48506A patent/IT1242169B/it active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
GB2239580A (en) | 1991-07-03 |
IT9048506A0 (it) | 1990-11-22 |
GB9025262D0 (en) | 1991-01-02 |
IT9048506A1 (it) | 1991-05-28 |
JPH03166894A (ja) | 1991-07-18 |
US5128989A (en) | 1992-07-07 |
GB2239580B (en) | 1994-08-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19971129 |