FR2399175A1 - Dispositif de detection de la reception de signaux multifrequence - Google Patents

Dispositif de detection de la reception de signaux multifrequence

Info

Publication number
FR2399175A1
FR2399175A1 FR7822120A FR7822120A FR2399175A1 FR 2399175 A1 FR2399175 A1 FR 2399175A1 FR 7822120 A FR7822120 A FR 7822120A FR 7822120 A FR7822120 A FR 7822120A FR 2399175 A1 FR2399175 A1 FR 2399175A1
Authority
FR
France
Prior art keywords
detection device
frequency signal
signal reception
reception detection
frequency
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.)
Pending
Application number
FR7822120A
Other languages
English (en)
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
Western Electric 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of FR2399175A1 publication Critical patent/FR2399175A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

a. Dispositif pour détecter la réception de signaux multifréquence, comprenant plusieurs filtres pour laisser passer des tonalités multifréquence individuelles d'un signal reçu avec un gain réglé. b. Des détecteurs de seuil réglables sont connectés à plusieurs filtres pour engendrer des signaux de sortie représentant les tonalités multifréquence reçues qui ont des amplitudes supérieures à des niveaux de seuils prescrits, et un circuit de contrôle est connecté pour engendrer des signaux pour régler les détecteurs de seuils. c. Application aux télécommunications.
FR7822120A 1977-07-26 1978-07-26 Dispositif de detection de la reception de signaux multifrequence Pending FR2399175A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/819,112 US4091243A (en) 1977-07-26 1977-07-26 Multifrequency signal receiver

Publications (1)

Publication Number Publication Date
FR2399175A1 true FR2399175A1 (fr) 1979-02-23

Family

ID=25227234

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7822120A Pending FR2399175A1 (fr) 1977-07-26 1978-07-26 Dispositif de detection de la reception de signaux multifrequence

Country Status (13)

Country Link
US (1) US4091243A (fr)
JP (1) JPS5424509A (fr)
AU (1) AU3819478A (fr)
BE (1) BE869241A (fr)
CA (1) CA1102887A (fr)
ES (1) ES472043A1 (fr)
FR (1) FR2399175A1 (fr)
GB (1) GB2021354A (fr)
IL (1) IL55197A (fr)
IT (1) IT1097368B (fr)
NL (1) NL7807863A (fr)
SE (1) SE7902501L (fr)
WO (1) WO1979000066A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443783A1 (fr) * 1978-12-07 1980-07-04 Western Electric Co Detecteur de signaux multifrequences

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386239A (en) * 1980-06-17 1983-05-31 Bell Telephone Laboratories, Incorporated Multifrequency tone detector
ZA82379B (en) * 1981-01-28 1982-12-29 Grace Gmbh Process for producing porous materials and the use thereof
US4398147A (en) * 1981-04-15 1983-08-09 Western Electric Company, Inc. Methods of testing multifrequency dialing signals
US4463851A (en) * 1982-04-26 1984-08-07 Meritex Plastic Inc. Protective enclosure for electronic devices
US4608457A (en) * 1984-04-11 1986-08-26 Fowler Stephen L Telecommunications device for the hearing impared
US4604755A (en) * 1984-06-01 1986-08-05 International Business Machines Corp. Feed forward dual channel automatic level control for dual tone multi-frequency receivers
US4709297A (en) * 1984-06-29 1987-11-24 Siemens Aktiengesellschaft Guiding device for semiconductor components with DIL casings
CA1239719A (fr) * 1985-11-22 1988-07-26 Mitel Corporation Detecteur de tonalites de manoeuvre
US5588052A (en) * 1991-11-19 1996-12-24 Sharp Kabushiki Kaisha DTMF signal judging apparatus
EP0548438A1 (fr) * 1991-12-20 1993-06-30 International Business Machines Corporation Procédé et dispositif pour la détection de signaux multifréquences à deux tons
US5321745A (en) * 1992-05-26 1994-06-14 Vmx, Inc. Adaptive efficient single/dual tone decoder apparatus and method for identifying call-progression signals
US5699421A (en) * 1995-05-31 1997-12-16 Casio Phonemate, Inc. Telephone answering device with low cost dual tone multi-frequency detector
US5802112A (en) * 1996-01-16 1998-09-01 Transcendat Inc. Multi-level, multi-frequency interference pattern analog waveform encoding of digital data for transmission
US6038262A (en) * 1998-06-09 2000-03-14 Transcendata, Inc. Method and apparatus for compensation of electro-magnetic distortion using weighted feedback delay for amplitude coded sinusoidal waveform generation and transmission
GB2357216B (en) * 1999-12-11 2004-05-12 Mitel Corp Method and apparatus for detecting dual tone alerting signal in telephone systems

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU466639A (en) * 1939-10-13 1940-08-22 Philips Lamps Limited Improvements in or relating to adjustable slidable condensers
NL6716500A (fr) * 1966-12-03 1968-06-04
US3836727A (en) * 1972-01-27 1974-09-17 Philips Corp Signal receiver for receiving signals of different frequency
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3936801A (en) * 1974-09-12 1976-02-03 Bell Telephone Laboratories, Incorporated Multifrequency signal receiver timing circuit
US3961143A (en) * 1973-09-12 1976-06-01 International Standard Electric Corporation Multi-frequency signalling system
US4016370A (en) * 1975-03-19 1977-04-05 Chestel, Inc. Digital tone decoder

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU466639A (en) * 1939-10-13 1940-08-22 Philips Lamps Limited Improvements in or relating to adjustable slidable condensers
NL6716500A (fr) * 1966-12-03 1968-06-04
US3836727A (en) * 1972-01-27 1974-09-17 Philips Corp Signal receiver for receiving signals of different frequency
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3961143A (en) * 1973-09-12 1976-06-01 International Standard Electric Corporation Multi-frequency signalling system
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
US3936801A (en) * 1974-09-12 1976-02-03 Bell Telephone Laboratories, Incorporated Multifrequency signal receiver timing circuit
US4016370A (en) * 1975-03-19 1977-04-05 Chestel, Inc. Digital tone decoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443783A1 (fr) * 1978-12-07 1980-07-04 Western Electric Co Detecteur de signaux multifrequences

Also Published As

Publication number Publication date
GB2021354A (en) 1979-11-28
JPS5424509A (en) 1979-02-23
AU3819478A (en) 1980-01-24
IT7826073A0 (it) 1978-07-25
IT1097368B (it) 1985-08-31
BE869241A (fr) 1978-11-16
IL55197A0 (en) 1978-09-29
NL7807863A (nl) 1979-01-30
IL55197A (en) 1980-05-30
ES472043A1 (es) 1979-02-01
WO1979000066A1 (fr) 1979-02-22
US4091243A (en) 1978-05-23
SE7902501L (fr) 1979-03-20
CA1102887A (fr) 1981-06-09

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