FR2374808A1 - METHOD AND DEVICE FOR RECOGNIZING TELEPHONE SIGNALS CODED IN MULTI-FREQUENCY TRANSFORMED INTO DIGITAL FORM - Google Patents

METHOD AND DEVICE FOR RECOGNIZING TELEPHONE SIGNALS CODED IN MULTI-FREQUENCY TRANSFORMED INTO DIGITAL FORM

Info

Publication number
FR2374808A1
FR2374808A1 FR7737621A FR7737621A FR2374808A1 FR 2374808 A1 FR2374808 A1 FR 2374808A1 FR 7737621 A FR7737621 A FR 7737621A FR 7737621 A FR7737621 A FR 7737621A FR 2374808 A1 FR2374808 A1 FR 2374808A1
Authority
FR
France
Prior art keywords
signals
digital form
value
exchange
telephone signals
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
FR7737621A
Other languages
French (fr)
Other versions
FR2374808B1 (en
Inventor
Flavio Melindo
Renato Rocci
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.)
Telecom Italia SpA
Original Assignee
CSELT Centro Studi e Laboratori Telecomunicazioni SpA
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 CSELT Centro Studi e Laboratori Telecomunicazioni SpA filed Critical CSELT Centro Studi e Laboratori Telecomunicazioni SpA
Publication of FR2374808A1 publication Critical patent/FR2374808A1/en
Application granted granted Critical
Publication of FR2374808B1 publication Critical patent/FR2374808B1/fr
Granted 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
    • H04Q1/457—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Abstract

Un procédé et un dispositif pour reconnaître les signaux codés en multifréquence, transformés en forme numérique, pour l'échange de signaux entre un central de commutation numérique et un central de type conventionnel. Ce procédé consiste à engendrer des signaux ayant une ampleur qui dépasse une certaine valeur de seuil, à établir une corrélation entre la valeur absolue desdits signaux et une première constante, à faire une première série de mesures d'ampleur et de temps, une deuxième série de mesures d'ampleur et de temps pour séparer les signaux valides des bruits, la fin du signal etant reconnue comme réduction de la valeur d'ampleur jusqu'à une partie de sa valeur au moment de la reconnaissance; les informations relatives aux fréquences contenant dans chaque signal valide étant envoyées à l'élaborateur du central téléphonique.A method and a device for recognizing the signals encoded in multifrequency, transformed into digital form, for the exchange of signals between a digital switching center and an exchange of conventional type. This method consists in generating signals having an amplitude which exceeds a certain threshold value, in establishing a correlation between the absolute value of said signals and a first constant, in making a first series of amplitude and time measurements, a second series magnitude and time measurements to separate valid signals from noises, the end of the signal being recognized as a reduction in magnitude value to part of its value at the time of recognition; the information relating to the frequencies contained in each valid signal being sent to the operator of the telephone exchange.

FR7737621A 1976-12-17 1977-12-14 METHOD AND DEVICE FOR RECOGNIZING TELEPHONE SIGNALS CODED IN MULTI-FREQUENCY TRANSFORMED INTO DIGITAL FORM Granted FR2374808A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT7000776A IT1072242B (en) 1976-12-17 1976-12-17 PROCEDURE AND DEVICE FOR THE RECOGNITION OF TELEPHONE SIGNALS IN MULTIFREQUENCY CODE CONVERTED IN NUMERICAL FORM

Publications (2)

Publication Number Publication Date
FR2374808A1 true FR2374808A1 (en) 1978-07-13
FR2374808B1 FR2374808B1 (en) 1982-03-19

Family

ID=11313285

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7737621A Granted FR2374808A1 (en) 1976-12-17 1977-12-14 METHOD AND DEVICE FOR RECOGNIZING TELEPHONE SIGNALS CODED IN MULTI-FREQUENCY TRANSFORMED INTO DIGITAL FORM

Country Status (11)

Country Link
JP (1) JPS53121408A (en)
AR (1) AR216659A1 (en)
AU (1) AU507727B2 (en)
BR (1) BR7707827A (en)
DE (1) DE2756251C3 (en)
FR (1) FR2374808A1 (en)
GB (1) GB1566164A (en)
IT (1) IT1072242B (en)
MX (1) MX144395A (en)
SE (1) SE437102B (en)
TR (1) TR19857A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011018A1 (en) * 1978-10-27 1980-05-14 Le Materiel Telephonique Thomson-Csf Recognition apparatus and method for a digital multi-frequency signal receiver
FR2450017A1 (en) * 1979-02-22 1980-09-19 Northern Telecom Ltd RECEIVER FOR DIGITAL SIGNALING FOR THE RECEPTION OF SOUND MODULES BY PULSE CODE (MIC)
FR2479631A1 (en) * 1980-03-28 1981-10-02 Cit Alcatel SIGNAL CONFIRMATION DEVICE
FR2485843A1 (en) * 1980-06-25 1981-12-31 Cit Alcatel DIGITAL FREQUENCY RECEIVER
FR2486748A1 (en) * 1980-07-09 1982-01-15 Italtel Spa MULTI-FREQUENCY TYPE SIGNALING CONTROL UNIT, ESPECIALLY APPLYING TO DIGITAL-TYPE TRANSIT TELEPHONE CENTERS
US4355405A (en) * 1979-04-27 1982-10-19 International Standard Electric Corporation Digital signalling system
FR2504329A1 (en) * 1981-04-15 1982-10-22 Western Electric Co MULTIFREQUENCY RECEIVER
EP0184984A1 (en) * 1984-11-30 1986-06-18 Ascom Autophon Ag Evaluating device for a pulsating tone signal
EP0197433A2 (en) * 1985-03-30 1986-10-15 Fujitsu Limited Switching system having a tone trunk and method for generating digital codes therein

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227055A (en) * 1978-12-07 1980-10-07 Bell Telephone Laboratories, Incorporated Multifrequency receiver
DE3424327A1 (en) * 1984-07-02 1986-01-09 Philips Patentverwaltung Gmbh, 2000 Hamburg Method and circuit arrangement for identifying the envelope curves of signal components of a multi-frequency coded dial signal
US4783845A (en) * 1985-12-20 1988-11-08 Itt Aerospace Optical Digital tone squelch detector
JPS62204652A (en) * 1986-03-04 1987-09-09 Nec Corp Audible frequency signal identification system
AU2014321320B2 (en) * 2013-09-20 2019-03-14 Otsuka Pharmaceutical Co., Ltd. Methods, devices and systems for receiving and decoding a signal in the presence of noise using slices and warping

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2195797A1 (en) * 1972-08-10 1974-03-08 Commw Of Australia

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773981A (en) * 1972-08-07 1973-11-20 Ibm Parallel tone multiplexer-receiver
NL7316990A (en) * 1973-12-12 1975-06-16 Philips Nv MFC RECEIVER FOR DIGITAL SIGNAL PROCESSING.
FR2295665A1 (en) * 1974-12-18 1976-07-16 Labo Cent Telecommunicat MULTI-FREQUENCY DIGITAL SIGNAL RECEIVER
DE2515769A1 (en) * 1975-04-10 1976-10-21 Standard Elektrik Lorenz Ag FREQUENCY SELECTIVE SIGNAL RECEIVER

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2195797A1 (en) * 1972-08-10 1974-03-08 Commw Of Australia

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NV8089/76 *
NV8089/77 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011018A1 (en) * 1978-10-27 1980-05-14 Le Materiel Telephonique Thomson-Csf Recognition apparatus and method for a digital multi-frequency signal receiver
FR2440126A1 (en) * 1978-10-27 1980-05-23 Materiel Telephonique RECOGNITION DEVICE AND METHOD FOR A DIGITAL MULTI-FREQUENCY SIGNAL RECEIVER
FR2450017A1 (en) * 1979-02-22 1980-09-19 Northern Telecom Ltd RECEIVER FOR DIGITAL SIGNALING FOR THE RECEPTION OF SOUND MODULES BY PULSE CODE (MIC)
US4355405A (en) * 1979-04-27 1982-10-19 International Standard Electric Corporation Digital signalling system
FR2479631A1 (en) * 1980-03-28 1981-10-02 Cit Alcatel SIGNAL CONFIRMATION DEVICE
EP0037048A1 (en) * 1980-03-28 1981-10-07 COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL S.A. dite: Signal affirmation device
EP0043320A1 (en) * 1980-06-25 1982-01-06 COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL S.A. dite: Digital frequency receiver
FR2485843A1 (en) * 1980-06-25 1981-12-31 Cit Alcatel DIGITAL FREQUENCY RECEIVER
FR2486748A1 (en) * 1980-07-09 1982-01-15 Italtel Spa MULTI-FREQUENCY TYPE SIGNALING CONTROL UNIT, ESPECIALLY APPLYING TO DIGITAL-TYPE TRANSIT TELEPHONE CENTERS
FR2504329A1 (en) * 1981-04-15 1982-10-22 Western Electric Co MULTIFREQUENCY RECEIVER
EP0184984A1 (en) * 1984-11-30 1986-06-18 Ascom Autophon Ag Evaluating device for a pulsating tone signal
CH672968A5 (en) * 1984-11-30 1990-01-15 Autophon Ascom Ag
EP0197433A2 (en) * 1985-03-30 1986-10-15 Fujitsu Limited Switching system having a tone trunk and method for generating digital codes therein
EP0197433A3 (en) * 1985-03-30 1988-08-24 Fujitsu Limited Switching system having a tone trunk and method for generating digital codes therein

Also Published As

Publication number Publication date
FR2374808B1 (en) 1982-03-19
AU507727B2 (en) 1980-02-28
JPS53121408A (en) 1978-10-23
DE2756251B2 (en) 1981-03-26
IT1072242B (en) 1985-04-10
AR216659A1 (en) 1980-01-15
MX144395A (en) 1981-10-07
TR19857A (en) 1980-03-01
BR7707827A (en) 1978-08-22
DE2756251C3 (en) 1981-11-19
GB1566164A (en) 1980-04-30
DE2756251A1 (en) 1978-06-22
AU3132077A (en) 1979-06-14
SE437102B (en) 1985-02-04
JPS5731342B2 (en) 1982-07-03
SE7714181L (en) 1978-06-18

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