GB1521414A - Multifrequency signalling decoder - Google Patents

Multifrequency signalling decoder

Info

Publication number
GB1521414A
GB1521414A GB1109876A GB1109876A GB1521414A GB 1521414 A GB1521414 A GB 1521414A GB 1109876 A GB1109876 A GB 1109876A GB 1109876 A GB1109876 A GB 1109876A GB 1521414 A GB1521414 A GB 1521414A
Authority
GB
United Kingdom
Prior art keywords
signal
jitter
period
predetermined
npqt
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1109876A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AMERICAN TELECOMM
American Telecommunications Corp
Original Assignee
AMERICAN TELECOMM
American Telecommunications 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 AMERICAN TELECOMM, American Telecommunications Corp filed Critical AMERICAN TELECOMM
Publication of GB1521414A publication Critical patent/GB1521414A/en
Expired legal-status Critical Current

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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
GB1109876A 1975-04-11 1976-03-19 Multifrequency signalling decoder Expired GB1521414A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1521414A true GB1521414A (en) 1978-08-16

Family

ID=24265706

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1109876A Expired GB1521414A (en) 1975-04-11 1976-03-19 Multifrequency signalling decoder

Country Status (5)

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

Also Published As

Publication number Publication date
JPS51139712A (en) 1976-12-02
CA1043024A (en) 1978-11-21
DE2613245A1 (de) 1976-10-21
BE840630A (fr) 1976-10-11

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee