FR2295665B1 - - Google Patents

Info

Publication number
FR2295665B1
FR2295665B1 FR7441711A FR7441711A FR2295665B1 FR 2295665 B1 FR2295665 B1 FR 2295665B1 FR 7441711 A FR7441711 A FR 7441711A FR 7441711 A FR7441711 A FR 7441711A FR 2295665 B1 FR2295665 B1 FR 2295665B1
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
Application number
FR7441711A
Other languages
French (fr)
Other versions
FR2295665A1 (fr
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.)
Laboratoire Central de Telecommunications SA
Original Assignee
Laboratoire Central de Telecommunications SA
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 Laboratoire Central de Telecommunications SA filed Critical Laboratoire Central de Telecommunications SA
Priority to FR7441711A priority Critical patent/FR2295665A1/fr
Priority to GB49404/75A priority patent/GB1492310A/en
Priority to ZA757642A priority patent/ZA757642B/xx
Priority to IE2720/75A priority patent/IE42621B1/en
Priority to DE2556354A priority patent/DE2556354C2/de
Publication of FR2295665A1 publication Critical patent/FR2295665A1/fr
Application granted granted Critical
Publication of FR2295665B1 publication Critical patent/FR2295665B1/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
FR7441711A 1974-12-18 1974-12-18 Recepteur numerique de signaux multifrequences Granted FR2295665A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR7441711A FR2295665A1 (fr) 1974-12-18 1974-12-18 Recepteur numerique de signaux multifrequences
GB49404/75A GB1492310A (en) 1974-12-18 1975-12-02 Digital multifrequency signals receiver
ZA757642A ZA757642B (en) 1974-12-18 1975-12-05 Digital multifrequency signals receiver
IE2720/75A IE42621B1 (en) 1974-12-18 1975-12-12 Digital multifrequency signals receiver
DE2556354A DE2556354C2 (de) 1974-12-18 1975-12-13 Digitaler Mehrfrequenzcodezeichenempfänger für Wählkennzeichen in Fernmelde-, insbesondere Fernsprechanlagen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7441711A FR2295665A1 (fr) 1974-12-18 1974-12-18 Recepteur numerique de signaux multifrequences

Publications (2)

Publication Number Publication Date
FR2295665A1 FR2295665A1 (fr) 1976-07-16
FR2295665B1 true FR2295665B1 (pt) 1978-07-13

Family

ID=9146325

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7441711A Granted FR2295665A1 (fr) 1974-12-18 1974-12-18 Recepteur numerique de signaux multifrequences

Country Status (5)

Country Link
DE (1) DE2556354C2 (pt)
FR (1) FR2295665A1 (pt)
GB (1) GB1492310A (pt)
IE (1) IE42621B1 (pt)
ZA (1) ZA757642B (pt)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2373926A1 (fr) * 1976-12-10 1978-07-07 Constr Telephoniques Recepteur de signaux multifrequences
IT1072242B (it) * 1976-12-17 1985-04-10 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica
FR2440126A1 (fr) * 1978-10-27 1980-05-23 Materiel Telephonique Dispositif et procede de reconnaissance pour recepteur numerique de signaux multifrequences
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
CA1137565A (en) * 1979-05-22 1982-12-14 Masaharu Kawaguchi Digital multi-frequency receiver
US4460808A (en) * 1982-08-23 1984-07-17 At&T Bell Laboratories Adaptive signal receiving method and apparatus
DD266253A3 (de) * 1987-06-22 1989-03-29 Leipzig Rft Nachrichtenelekt Universeller digitaler mfc-empfaenger
DE3743755C2 (de) * 1987-12-23 1996-09-05 Sel Alcatel Ag Verfahren und Einrichtung zur sicheren Übertragung von Blockinformation zwischen Spurplanstellwerken
US4833399A (en) * 1988-06-13 1989-05-23 Texas Instruments Incorporated DTMF receiver

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603175A (pt) * 1968-07-30 1971-03-22
US3706076A (en) * 1970-12-21 1972-12-12 Bell Telephone Labor Inc Programmable digital filter apparatus

Also Published As

Publication number Publication date
ZA757642B (en) 1976-11-24
IE42621L (en) 1976-06-18
DE2556354C2 (de) 1984-03-08
GB1492310A (en) 1977-11-16
DE2556354A1 (de) 1976-06-24
FR2295665A1 (fr) 1976-07-16
IE42621B1 (en) 1980-09-10

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Legal Events

Date Code Title Description
ST Notification of lapse