IT1140634B - Ricevitore digitale di chiamata,per la ricezione di tono segnali modulati impulsivamente in codice - Google Patents

Ricevitore digitale di chiamata,per la ricezione di tono segnali modulati impulsivamente in codice

Info

Publication number
IT1140634B
IT1140634B IT19986/80A IT1998680A IT1140634B IT 1140634 B IT1140634 B IT 1140634B IT 19986/80 A IT19986/80 A IT 19986/80A IT 1998680 A IT1998680 A IT 1998680A IT 1140634 B IT1140634 B IT 1140634B
Authority
IT
Italy
Prior art keywords
impulsively
code
modulated signals
call receiver
digital call
Prior art date
Application number
IT19986/80A
Other languages
English (en)
Italian (it)
Other versions
IT8019986A1 (it
IT8019986A0 (it
Inventor
Sorin Cohn-Sfetcu
Jackylene Kay Hood
Daniel John Doyle
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of IT8019986A0 publication Critical patent/IT8019986A0/it
Publication of IT8019986A1 publication Critical patent/IT8019986A1/it
Application granted granted Critical
Publication of IT1140634B publication Critical patent/IT1140634B/it

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
IT19986/80A 1979-02-22 1980-02-18 Ricevitore digitale di chiamata,per la ricezione di tono segnali modulati impulsivamente in codice IT1140634B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA322,112A CA1111531A (fr) 1979-02-22 1979-02-22 Recepteur de tonalites mic

Publications (3)

Publication Number Publication Date
IT8019986A0 IT8019986A0 (it) 1980-02-18
IT8019986A1 IT8019986A1 (it) 1981-08-18
IT1140634B true IT1140634B (it) 1986-10-01

Family

ID=4113607

Family Applications (1)

Application Number Title Priority Date Filing Date
IT19986/80A IT1140634B (it) 1979-02-22 1980-02-18 Ricevitore digitale di chiamata,per la ricezione di tono segnali modulati impulsivamente in codice

Country Status (9)

Country Link
JP (1) JPS55137788A (fr)
AT (1) AT386312B (fr)
CA (1) CA1111531A (fr)
DE (1) DE3005740A1 (fr)
FR (1) FR2450017A1 (fr)
GB (1) GB2044039B (fr)
IT (1) IT1140634B (fr)
NL (1) NL8001026A (fr)
SE (1) SE452388B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779751A (en) * 1980-11-05 1982-05-19 Nec Corp Signal receiver
FR2504754A1 (fr) * 1981-04-27 1982-10-29 Thomson Csf Mat Tel Dispositif sequenceur a memoires mortes
US4519072A (en) * 1982-11-10 1985-05-21 Rockwell International Corporation Answer supervision system
JPH07171782A (ja) * 1991-07-16 1995-07-11 Haruo Konagai 真空吸着装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603175A (fr) * 1968-07-30 1971-03-22
US3863030A (en) * 1972-06-01 1975-01-28 Gte Automatic Electric Lab Inc Pcm tone receiver using digital spectrum analysis
JPS51112218A (en) * 1975-03-28 1976-10-04 Hitachi Ltd Multifrequency signal receiver
JPS5918916B2 (ja) * 1975-10-06 1984-05-01 株式会社日立製作所 多周波信号受信器
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

Also Published As

Publication number Publication date
FR2450017A1 (fr) 1980-09-19
AT386312B (de) 1988-08-10
GB2044039B (en) 1983-05-11
SE452388B (sv) 1987-11-23
DE3005740A1 (de) 1980-09-04
GB2044039A (en) 1980-10-08
ATA96280A (de) 1987-12-15
FR2450017B1 (fr) 1984-05-11
JPS55137788A (en) 1980-10-27
CA1111531A (fr) 1981-10-27
IT8019986A1 (it) 1981-08-18
IT8019986A0 (it) 1980-02-18
SE8001315L (sv) 1980-08-23
NL8001026A (nl) 1980-08-26

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