IT980245B - Sistema di segnalazione telefonica - Google Patents

Sistema di segnalazione telefonica

Info

Publication number
IT980245B
IT980245B IT4949273A IT4949273A IT980245B IT 980245 B IT980245 B IT 980245B IT 4949273 A IT4949273 A IT 4949273A IT 4949273 A IT4949273 A IT 4949273A IT 980245 B IT980245 B IT 980245B
Authority
IT
Italy
Prior art keywords
signaling system
telephone signaling
telephone
signaling
Prior art date
Application number
IT4949273A
Other languages
English (en)
Original Assignee
Nederlanden Staat
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 Nederlanden Staat filed Critical Nederlanden Staat
Application granted granted Critical
Publication of IT980245B publication Critical patent/IT980245B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/12—Arrangements providing for calling or supervisory signals
    • 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)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
IT4949273A 1972-04-17 1973-04-17 Sistema di segnalazione telefonica IT980245B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7205132A NL154386B (nl) 1972-04-17 1972-04-17 Signaleringsstelsel.

Publications (1)

Publication Number Publication Date
IT980245B true IT980245B (it) 1974-09-30

Family

ID=19815859

Family Applications (1)

Application Number Title Priority Date Filing Date
IT4949273A IT980245B (it) 1972-04-17 1973-04-17 Sistema di segnalazione telefonica

Country Status (5)

Country Link
DE (1) DE2318172C3 (it)
FR (1) FR2180901B1 (it)
IT (1) IT980245B (it)
NL (1) NL154386B (it)
SE (1) SE380701B (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL177169B (nl) * 1978-09-08 1985-03-01 Nederlanden Staat Inrichting om de aanwezigheid vast te stellen van een of meer van een aantal frequenties in pulscode-gemoduleerde signalen.
AT374325B (de) * 1980-04-18 1984-04-10 Siemens Ag Oesterreich Einrichtung zur erzeugung zweier zu ueberlagernder elektrischer schwingungen unterschiedlicher frequenzen, insbesondere zur erzeugung von codezeichen fuer mehrfrequenzcodewahl
US4620294A (en) * 1983-09-09 1986-10-28 Cts Corporation Digital signal processor modem
US4599583A (en) * 1983-11-19 1986-07-08 Fujitsu Limited Mixed dual frequency generating system
DE4408323C2 (de) * 1994-03-11 1999-03-11 Siemens Ag Verfahren zur Erzeugung eines digitalen Sinussignales mit einer vorgegebenen Abtastrate und Schaltungsanordnung zur Durchführung des Verfahrens

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267387A (it) * 1960-08-23

Also Published As

Publication number Publication date
DE2318172B2 (de) 1975-02-20
FR2180901B1 (it) 1979-03-30
DE2318172A1 (de) 1973-10-25
NL154386B (nl) 1977-08-15
DE2318172C3 (de) 1975-09-25
SE380701B (sv) 1975-11-10
NL7205132A (it) 1973-10-19
FR2180901A1 (it) 1973-11-30

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