NL7309814A - - Google Patents

Info

Publication number
NL7309814A
NL7309814A NL7309814A NL7309814A NL7309814A NL 7309814 A NL7309814 A NL 7309814A NL 7309814 A NL7309814 A NL 7309814A NL 7309814 A NL7309814 A NL 7309814A NL 7309814 A NL7309814 A NL 7309814A
Authority
NL
Netherlands
Application number
NL7309814A
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 filed Critical
Publication of NL7309814A publication Critical patent/NL7309814A/xx

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
NL7309814A 1972-07-26 1973-07-13 NL7309814A (Direct)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2236781A DE2236781C2 (de) 1972-07-26 1972-07-26 Schaltungsanordnung für Mehrfrequenzen-Codezeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen mit zusätzlichem Datenverkehr

Publications (1)

Publication Number Publication Date
NL7309814A true NL7309814A (Direct) 1974-01-29

Family

ID=5851808

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7309814A NL7309814A (Direct) 1972-07-26 1973-07-13

Country Status (12)

Country Link
US (1) US3914558A (Direct)
JP (1) JPS4953702A (Direct)
AT (1) AT326732B (Direct)
BE (1) BE802836A (Direct)
CH (1) CH558115A (Direct)
DE (1) DE2236781C2 (Direct)
FR (1) FR2194092B1 (Direct)
GB (1) GB1427407A (Direct)
IT (1) IT992675B (Direct)
LU (1) LU68083A1 (Direct)
NL (1) NL7309814A (Direct)
SE (1) SE385179B (Direct)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2534636A1 (de) * 1975-08-02 1977-02-17 Telefonbau & Normalzeit Gmbh Schaltungsanordnung zum senden von anschaltinformationen, insbesondere in nebenstellenanlagen
JPS54120503A (en) * 1978-03-11 1979-09-19 Nippon Telegr & Teleph Corp <Ntt> Coding system for push-button dial signal
FR2759224B1 (fr) * 1997-02-06 1999-04-30 Info Telecom Procedes de transmission et de decodage acoustiques d'un message numerique et dispositifs correspondants

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver
US3582562A (en) * 1969-05-07 1971-06-01 Itt Key telephone intercommunication system

Also Published As

Publication number Publication date
SE385179B (sv) 1976-06-08
AT326732B (de) 1975-12-29
FR2194092B1 (Direct) 1976-11-12
GB1427407A (en) 1976-03-10
DE2236781C2 (de) 1974-06-12
IT992675B (it) 1975-09-30
US3914558A (en) 1975-10-21
DE2236781A1 (Direct) 1973-11-08
JPS4953702A (Direct) 1974-05-24
LU68083A1 (Direct) 1974-03-07
BE802836A (fr) 1974-01-28
ATA438073A (de) 1975-03-15
DE2236781B1 (de) 1973-11-08
FR2194092A1 (Direct) 1974-02-22
CH558115A (de) 1975-01-15

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Legal Events

Date Code Title Description
BV The patent application has lapsed