CA1047658A - Method for detecting the presence of speech band activity in a telephone connection and a circuit for carrying out such method - Google Patents
Method for detecting the presence of speech band activity in a telephone connection and a circuit for carrying out such methodInfo
- Publication number
- CA1047658A CA1047658A CA225,253A CA225253A CA1047658A CA 1047658 A CA1047658 A CA 1047658A CA 225253 A CA225253 A CA 225253A CA 1047658 A CA1047658 A CA 1047658A
- Authority
- CA
- Canada
- Prior art keywords
- line
- signal
- circuit
- bits
- combination defined
- 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.)
- Expired
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Interface Circuits In Exchanges (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT21869/74A IT1014614B (it) | 1974-04-24 | 1974-04-24 | Circuito per rivelare la presenza di attivita in banda fonica in una giunzione telefonica |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1047658A true CA1047658A (en) | 1979-01-30 |
Family
ID=11188002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA225,253A Expired CA1047658A (en) | 1974-04-24 | 1975-04-23 | Method for detecting the presence of speech band activity in a telephone connection and a circuit for carrying out such method |
Country Status (13)
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4061878A (en) * | 1976-05-10 | 1977-12-06 | Universite De Sherbrooke | Method and apparatus for speech detection of PCM multiplexed voice channels |
| US4171466A (en) * | 1977-05-16 | 1979-10-16 | Bell Telephone Laboratories, Incorporated | Digital wave generator for composite tone |
| US4314100A (en) * | 1980-01-24 | 1982-02-02 | Storage Technology Corporation | Data detection circuit for a TASI system |
| DE3116373C2 (de) * | 1981-04-16 | 1983-01-20 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur Anzeige einer Sende- und Empfangs-Signalinformation an einer optischen Auswerteeinrichtung |
| DE3220905C1 (de) * | 1982-06-03 | 1983-12-29 | Vierling, Oskar, Prof. Dr.Phil.Habil., 8553 Ebermannstadt | Sensor zur Verkehrserfassung von aus Analogsignalen bestehenden Nachrichtenströmen auf Fernmeldeleitungen |
| DE3323534C1 (de) * | 1983-06-30 | 1985-02-14 | Vierling, Oskar, Prof. Dr.Phil.Habil., 8553 Ebermannstadt | Sensor zur Verkehrserfassung von aus Analogsignalen bestehenden Nachrichtenströmen auf Fernmeldeleitungen |
| US4667065A (en) * | 1985-02-28 | 1987-05-19 | Bangerter Richard M | Apparatus and methods for electrical signal discrimination |
| US4764966A (en) * | 1985-10-11 | 1988-08-16 | International Business Machines Corporation | Method and apparatus for voice detection having adaptive sensitivity |
| US4742537A (en) * | 1986-06-04 | 1988-05-03 | Electronic Information Systems, Inc. | Telephone line monitoring system |
| JPH07113840B2 (ja) * | 1989-06-29 | 1995-12-06 | 三菱電機株式会社 | 音声検出器 |
| JP2609752B2 (ja) * | 1990-10-09 | 1997-05-14 | 三菱電機株式会社 | 音声／音声帯域内データ識別装置 |
| DE4127295A1 (de) * | 1991-08-17 | 1993-02-18 | Koelchens Gert Dipl Ing | Spracherkennungsschalter |
| US5796811A (en) * | 1995-11-15 | 1998-08-18 | Gateway Technologies, Inc. | Three way call detection |
| US5805685A (en) * | 1995-11-15 | 1998-09-08 | Gateway Technologies, Inc. | Three way call detection by counting signal characteristics |
| US7899167B1 (en) | 2003-08-15 | 2011-03-01 | Securus Technologies, Inc. | Centralized call processing |
| US7505406B1 (en) | 2001-07-13 | 2009-03-17 | Evercom Systems, Inc. | Public telephone control with voice over internet protocol transmission |
| US8000269B1 (en) | 2001-07-13 | 2011-08-16 | Securus Technologies, Inc. | Call processing with voice over internet protocol transmission |
| US9026468B2 (en) | 2002-04-29 | 2015-05-05 | Securus Technologies, Inc. | System and method for proactively establishing a third-party payment account for services rendered to a resident of a controlled-environment facility |
| US7916845B2 (en) | 2006-04-13 | 2011-03-29 | Securus Technologies, Inc. | Unauthorized call activity detection and prevention systems and methods for a Voice over Internet Protocol environment |
| US7860222B1 (en) | 2003-11-24 | 2010-12-28 | Securus Technologies, Inc. | Systems and methods for acquiring, accessing, and analyzing investigative information |
| US9020114B2 (en) | 2002-04-29 | 2015-04-28 | Securus Technologies, Inc. | Systems and methods for detecting a call anomaly using biometric identification |
| EP1385014B1 (en) * | 2002-07-25 | 2006-02-08 | Agilent Technologies Inc. a Delaware Corporation | Signal sampling with sampling and reference paths |
| US7529357B1 (en) | 2003-08-15 | 2009-05-05 | Evercom Systems, Inc. | Inmate management and call processing systems and methods |
| US8542802B2 (en) | 2007-02-15 | 2013-09-24 | Global Tel*Link Corporation | System and method for three-way call detection |
| US10796392B1 (en) | 2007-05-22 | 2020-10-06 | Securus Technologies, Llc | Systems and methods for facilitating booking, bonding and release |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1170306A (en) * | 1967-11-16 | 1969-11-12 | Standard Telephones Cables Ltd | Apparatus for Analysing Complex Waveforms |
| US3513260A (en) * | 1967-10-13 | 1970-05-19 | Ibm | Speech presence detector |
| US3712959A (en) * | 1969-07-14 | 1973-01-23 | Communications Satellite Corp | Method and apparatus for detecting speech signals in the presence of noise |
| US3878337A (en) * | 1970-03-13 | 1975-04-15 | Communications Satellite Corp | Device for speech detection independent of amplitude |
-
1974
- 1974-04-24 IT IT21869/74A patent/IT1014614B/it active
-
1975
- 1975-01-21 FR FR7501816A patent/FR2269247B1/fr not_active Expired
- 1975-02-14 BE BE153361A patent/BE825536A/xx unknown
- 1975-03-20 BR BR2114/75A patent/BR7501653A/pt unknown
- 1975-03-24 ES ES435939A patent/ES435939A1/es not_active Expired
- 1975-04-16 GB GB15605/75A patent/GB1501726A/en not_active Expired
- 1975-04-16 JP JP50045398A patent/JPS50140208A/ja active Pending
- 1975-04-22 NL NL7504782A patent/NL7504782A/xx not_active Application Discontinuation
- 1975-04-23 US US05/570,581 patent/US3985956A/en not_active Expired - Lifetime
- 1975-04-23 CA CA225,253A patent/CA1047658A/en not_active Expired
- 1975-04-23 DK DK174275A patent/DK174275A/da active IP Right Grant
- 1975-04-24 SE SE7504752A patent/SE7504752L/xx unknown
- 1975-04-24 DE DE19752518320 patent/DE2518320A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| ES435939A1 (es) | 1976-12-16 |
| FR2269247B1 (US20080138455A1-20080612-C00006.png) | 1979-08-24 |
| NL7504782A (nl) | 1975-10-28 |
| IT1014614B (it) | 1977-04-30 |
| DK174275A (da) | 1975-10-25 |
| BE825536A (fr) | 1975-05-29 |
| AU8038975A (en) | 1976-10-28 |
| DE2518320A1 (de) | 1975-11-20 |
| FR2269247A1 (US20080138455A1-20080612-C00006.png) | 1975-11-21 |
| JPS50140208A (US20080138455A1-20080612-C00006.png) | 1975-11-10 |
| GB1501726A (en) | 1978-02-22 |
| US3985956A (en) | 1976-10-12 |
| BR7501653A (pt) | 1976-03-09 |
| SE7504752L (sv) | 1975-10-27 |
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