CA2081535A1 - Methode et dispositif pour la detection des signaux de commande - Google Patents

Methode et dispositif pour la detection des signaux de commande

Info

Publication number
CA2081535A1
CA2081535A1 CA2081535A CA2081535A CA2081535A1 CA 2081535 A1 CA2081535 A1 CA 2081535A1 CA 2081535 A CA2081535 A CA 2081535A CA 2081535 A CA2081535 A CA 2081535A CA 2081535 A1 CA2081535 A1 CA 2081535A1
Authority
CA
Canada
Prior art keywords
control signal
ratio
information
similarity score
model
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
Application number
CA2081535A
Other languages
English (en)
Other versions
CA2081535C (fr
Inventor
Craig Robert Lindberg
David James Thomson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2081535A1 publication Critical patent/CA2081535A1/fr
Application granted granted Critical
Publication of CA2081535C publication Critical patent/CA2081535C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
CA002081535A 1991-12-31 1992-10-27 Methode et dispositif pour la detection des signaux de commande Expired - Fee Related CA2081535C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/816,332 US5442696A (en) 1991-12-31 1991-12-31 Method and apparatus for detecting control signals
US816,332 1991-12-31

Publications (2)

Publication Number Publication Date
CA2081535A1 true CA2081535A1 (fr) 1993-07-01
CA2081535C CA2081535C (fr) 1997-02-04

Family

ID=25220303

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002081535A Expired - Fee Related CA2081535C (fr) 1991-12-31 1992-10-27 Methode et dispositif pour la detection des signaux de commande

Country Status (6)

Country Link
US (1) US5442696A (fr)
EP (1) EP0550144A1 (fr)
JP (1) JP3066213B2 (fr)
KR (1) KR930015536A (fr)
AU (1) AU643632B2 (fr)
CA (1) CA2081535C (fr)

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EP1433295B1 (fr) * 2001-10-05 2011-09-28 Phonak Ag Procede permettant de verifier la presence d'une composante de signal et dispositif servant a mettre en oeuvre ce procede
US7860222B1 (en) 2003-11-24 2010-12-28 Securus Technologies, Inc. Systems and methods for acquiring, accessing, and analyzing investigative information
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
US9020114B2 (en) 2002-04-29 2015-04-28 Securus Technologies, Inc. Systems and methods for detecting a call anomaly using biometric identification
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
US7359451B2 (en) 2002-06-21 2008-04-15 Disney Enterprises, Inc. System and method for wirelessly transmitting and receiving digital tokens for use in electronic gameplay
US7764716B2 (en) 2002-06-21 2010-07-27 Disney Enterprises, Inc. System and method for wirelessly transmitting and receiving digital data using acoustical tones
US6915224B2 (en) * 2002-10-25 2005-07-05 Jung-Ching Wu Method for optimum spectrum analysis
US7400573B2 (en) * 2003-04-29 2008-07-15 Intel Corporation Dynamic allocation of cyclic extension in orthogonal frequency division multiplexing systems
US7139567B2 (en) * 2003-06-18 2006-11-21 The Johns Hopkins University Tone based command system for reception of very weak signals
US7529357B1 (en) 2003-08-15 2009-05-05 Evercom Systems, Inc. Inmate management and call processing systems and methods
US7366110B2 (en) * 2004-09-30 2008-04-29 Avaya Technology Corp. Method and apparatus for merging call components during call reconstruction
US8462637B1 (en) 2005-01-04 2013-06-11 Sheridan Ross P.C. Dial plan routing for fragmented networks
US7613106B2 (en) * 2005-01-04 2009-11-03 Avaya Inc. Dial plan transparency for fragmented networks
US10796392B1 (en) 2007-05-22 2020-10-06 Securus Technologies, Llc Systems and methods for facilitating booking, bonding and release
US9363366B1 (en) * 2015-02-13 2016-06-07 Wipro Limited System and method for improved lawful interceptions for calls involving in-band DTMF signaling
US9503568B1 (en) 2016-06-30 2016-11-22 Captioncall, Llc Detecting dial tone on a telephone line
US10257591B2 (en) 2016-08-02 2019-04-09 Pindrop Security, Inc. Call classification through analysis of DTMF events
CN110830410B (zh) * 2019-11-08 2022-08-16 中国人民解放军海军航空大学 严格奇偶对称的椭圆球面波信号构建与检测方法
WO2021154600A1 (fr) * 2020-01-27 2021-08-05 Pindrop Security, Inc. Système de détection de mystification robuste utilisant des réseaux neuronaux résiduels profonds
AU2021231850B2 (en) 2020-03-05 2023-08-03 Pindrop Security, Inc. Systems and methods of speaker-independent embedding for identification and verification from audio

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Also Published As

Publication number Publication date
US5442696A (en) 1995-08-15
EP0550144A1 (fr) 1993-07-07
KR930015536A (ko) 1993-07-24
JPH0686338A (ja) 1994-03-25
AU643632B2 (en) 1993-11-18
AU3006192A (en) 1993-07-08
CA2081535C (fr) 1997-02-04
JP3066213B2 (ja) 2000-07-17

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