IE42621B1 - Digital multifrequency signals receiver - Google Patents

Digital multifrequency signals receiver

Info

Publication number
IE42621B1
IE42621B1 IE2720/75A IE272075A IE42621B1 IE 42621 B1 IE42621 B1 IE 42621B1 IE 2720/75 A IE2720/75 A IE 2720/75A IE 272075 A IE272075 A IE 272075A IE 42621 B1 IE42621 B1 IE 42621B1
Authority
IE
Ireland
Prior art keywords
signal
value
signals
digital
threshold
Prior art date
Application number
IE2720/75A
Other languages
English (en)
Other versions
IE42621L (en
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE42621L publication Critical patent/IE42621L/xx
Publication of IE42621B1 publication Critical patent/IE42621B1/en

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)
IE2720/75A 1974-12-18 1975-12-12 Digital multifrequency signals receiver IE42621B1 (en)

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
IE42621L IE42621L (en) 1976-06-18
IE42621B1 true IE42621B1 (en) 1980-09-10

Family

ID=9146325

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2720/75A IE42621B1 (en) 1974-12-18 1975-12-12 Digital multifrequency signals receiver

Country Status (5)

Country Link
DE (1) DE2556354C2 (US06420036-20020716-C00037.png)
FR (1) FR2295665A1 (US06420036-20020716-C00037.png)
GB (1) GB1492310A (US06420036-20020716-C00037.png)
IE (1) IE42621B1 (US06420036-20020716-C00037.png)
ZA (1) ZA757642B (US06420036-20020716-C00037.png)

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 (US06420036-20020716-C00037.png) * 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
FR2295665B1 (US06420036-20020716-C00037.png) 1978-07-13
DE2556354C2 (de) 1984-03-08
FR2295665A1 (fr) 1976-07-16
DE2556354A1 (de) 1976-06-24
GB1492310A (en) 1977-11-16

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