GB687087A - Voice frequency signalling in telephone systems - Google Patents

Voice frequency signalling in telephone systems

Info

Publication number
GB687087A
GB687087A GB26794/50A GB2679450A GB687087A GB 687087 A GB687087 A GB 687087A GB 26794/50 A GB26794/50 A GB 26794/50A GB 2679450 A GB2679450 A GB 2679450A GB 687087 A GB687087 A GB 687087A
Authority
GB
United Kingdom
Prior art keywords
relay
amplifier
signals
pulses
over
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
GB26794/50A
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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 Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Publication of GB687087A publication Critical patent/GB687087A/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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Radio Relay Systems (AREA)
GB26794/50A 1949-11-22 1950-11-02 Voice frequency signalling in telephone systems Expired GB687087A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US128777A US2589113A (en) 1949-11-22 1949-11-22 Frequency modulated tone units

Publications (1)

Publication Number Publication Date
GB687087A true GB687087A (en) 1953-02-04

Family

ID=22436928

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26794/50A Expired GB687087A (en) 1949-11-22 1950-11-02 Voice frequency signalling in telephone systems

Country Status (3)

Country Link
US (1) US2589113A (en:Method)
BE (1) BE499462A (en:Method)
GB (1) GB687087A (en:Method)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155176A (en) * 1936-11-07 1939-04-18 Associated Electric Lab Inc Telephone system
BE424612A (en:Method) * 1936-11-14
US2482478A (en) * 1947-03-29 1949-09-20 Automatic Elect Lab Tone unit

Also Published As

Publication number Publication date
US2589113A (en) 1952-03-11
BE499462A (en:Method)

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