BE840630A - Decodeur d'appels telephoniques a multifrequence - Google Patents

Decodeur d'appels telephoniques a multifrequence

Info

Publication number
BE840630A
BE840630A BE166059A BE166059A BE840630A BE 840630 A BE840630 A BE 840630A BE 166059 A BE166059 A BE 166059A BE 166059 A BE166059 A BE 166059A BE 840630 A BE840630 A BE 840630A
Authority
BE
Belgium
Prior art keywords
telephone call
frequency telephone
call decoder
decoder
frequency
Prior art date
Application number
BE166059A
Other languages
English (en)
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 BE840630A publication Critical patent/BE840630A/fr

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
BE166059A 1975-04-11 1976-04-09 Decodeur d'appels telephoniques a multifrequence BE840630A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US56709875A 1975-04-11 1975-04-11

Publications (1)

Publication Number Publication Date
BE840630A true BE840630A (fr) 1976-10-11

Family

ID=24265706

Family Applications (1)

Application Number Title Priority Date Filing Date
BE166059A BE840630A (fr) 1975-04-11 1976-04-09 Decodeur d'appels telephoniques a multifrequence

Country Status (5)

Country Link
JP (1) JPS51139712A (fr)
BE (1) BE840630A (fr)
CA (1) CA1043024A (fr)
DE (1) DE2613245A1 (fr)
GB (1) GB1521414A (fr)

Also Published As

Publication number Publication date
GB1521414A (en) 1978-08-16
JPS51139712A (en) 1976-12-02
CA1043024A (fr) 1978-11-21
DE2613245A1 (de) 1976-10-21

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