FR2157143A5 - - Google Patents
Info
- Publication number
- FR2157143A5 FR2157143A5 FR7137562A FR7137562A FR2157143A5 FR 2157143 A5 FR2157143 A5 FR 2157143A5 FR 7137562 A FR7137562 A FR 7137562A FR 7137562 A FR7137562 A FR 7137562A FR 2157143 A5 FR2157143 A5 FR 2157143A5
- Authority
- FR
- France
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/17—Time-division multiplex systems in which the transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive, e.g. TASI
- H04J3/175—Speech activity or inactivity detectors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Time-Division Multiplex Systems (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7137562A FR2157143A5 (fr) | 1971-10-19 | 1971-10-19 | |
US00298531A US3801747A (en) | 1971-10-19 | 1972-10-18 | Speech detector for pcm-tasi system |
DE2251257A DE2251257C3 (de) | 1971-10-19 | 1972-10-19 | PCM-Vermittlungssystem, bei dem die bereits zugeteilten nicht benützten Kanäle im Bedarfsfall anderen Teilnehmern zugeteilt werden |
GB4823672A GB1364609A (en) | 1971-10-19 | 1972-10-19 | Speech detector for a communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7137562A FR2157143A5 (fr) | 1971-10-19 | 1971-10-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2157143A5 true FR2157143A5 (fr) | 1973-06-01 |
Family
ID=9084599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7137562A Expired FR2157143A5 (fr) | 1971-10-19 | 1971-10-19 |
Country Status (4)
Country | Link |
---|---|
US (1) | US3801747A (fr) |
DE (1) | DE2251257C3 (fr) |
FR (1) | FR2157143A5 (fr) |
GB (1) | GB1364609A (fr) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3958084A (en) * | 1974-09-30 | 1976-05-18 | Rockwell International Corporation | Conferencing apparatus |
NO134477C (fr) * | 1974-10-29 | 1976-10-13 | Manus Max | |
US4008375A (en) * | 1975-08-21 | 1977-02-15 | Communications Satellite Corporation (Comsat) | Digital voice switch for single or multiple channel applications |
US4052568A (en) * | 1976-04-23 | 1977-10-04 | Communications Satellite Corporation | Digital voice switch |
US4028496A (en) * | 1976-08-17 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Digital speech detector |
IT1091286B (it) * | 1977-10-20 | 1985-07-06 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per la trasmissione congiunta di segnali telefonici e segnali video su linee telefoniche numeriche |
DE2967644D1 (en) * | 1979-09-17 | 1987-01-29 | Eci Telecom Ltd | Apparatus for use in telephone communication |
US4352957A (en) * | 1980-03-17 | 1982-10-05 | Storage Technology Corporation | Speech detector circuit with associated gain control for a tasi system |
US4365112A (en) * | 1980-03-17 | 1982-12-21 | Storage Technology Corporation | Speech detector circuit for a TASI system |
US4535445A (en) * | 1983-06-16 | 1985-08-13 | At&T Information Systems | Conferencing system adaptive signal conditioner |
US5471527A (en) | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
DE69534462T2 (de) * | 1994-07-21 | 2006-07-13 | Ntt Docomo, Inc. | Verfahren und gerät zur audiodatenunterbrechung in einer mobilen funkanordnung mit satelliten |
US5822726A (en) * | 1995-01-31 | 1998-10-13 | Motorola, Inc. | Speech presence detector based on sparse time-random signal samples |
JP3157116B2 (ja) * | 1996-03-29 | 2001-04-16 | 三菱電機株式会社 | 音声符号化伝送システム |
US8542802B2 (en) | 2007-02-15 | 2013-09-24 | Global Tel*Link Corporation | System and method for three-way call detection |
US9225838B2 (en) | 2009-02-12 | 2015-12-29 | Value-Added Communications, Inc. | System and method for detecting three-way call circumvention attempts |
US9930088B1 (en) | 2017-06-22 | 2018-03-27 | Global Tel*Link Corporation | Utilizing VoIP codec negotiation during a controlled environment call |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2958733A (en) * | 1958-12-23 | 1960-11-01 | Bell Telephone Labor Inc | Transmission control in a two way communication system |
GB1102020A (en) * | 1965-08-26 | 1968-02-07 | Peter Heaton | Improvements relating to digital telephone systems |
JPS4933411B1 (fr) * | 1968-09-25 | 1974-09-06 | ||
US3712959A (en) * | 1969-07-14 | 1973-01-23 | Communications Satellite Corp | Method and apparatus for detecting speech signals in the presence of noise |
US3649766A (en) * | 1969-12-01 | 1972-03-14 | Bell Telephone Labor Inc | Digital speech detection system |
US3706091A (en) * | 1970-09-02 | 1972-12-12 | Bell Telephone Labor Inc | Digital threshold detector |
-
1971
- 1971-10-19 FR FR7137562A patent/FR2157143A5/fr not_active Expired
-
1972
- 1972-10-18 US US00298531A patent/US3801747A/en not_active Expired - Lifetime
- 1972-10-19 DE DE2251257A patent/DE2251257C3/de not_active Expired
- 1972-10-19 GB GB4823672A patent/GB1364609A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2251257C3 (de) | 1978-09-07 |
DE2251257B2 (de) | 1977-12-29 |
DE2251257A1 (de) | 1973-04-26 |
US3801747A (en) | 1974-04-02 |
GB1364609A (en) | 1974-08-21 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |