GB660686A - Improvements relating to telephone circuit signalling apparatus - Google Patents

Improvements relating to telephone circuit signalling apparatus

Info

Publication number
GB660686A
GB660686A GB2494/49A GB249449A GB660686A GB 660686 A GB660686 A GB 660686A GB 2494/49 A GB2494/49 A GB 2494/49A GB 249449 A GB249449 A GB 249449A GB 660686 A GB660686 A GB 660686A
Authority
GB
United Kingdom
Prior art keywords
relay
signal
rectified
frequency
signalling
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
GB2494/49A
Other languages
English (en)
Inventor
Myron Lebedinsky
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of GB660686A publication Critical patent/GB660686A/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)
  • Interface Circuits In Exchanges (AREA)
GB2494/49A 1948-02-06 1949-01-28 Improvements relating to telephone circuit signalling apparatus Expired GB660686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR660686X 1948-02-06

Publications (1)

Publication Number Publication Date
GB660686A true GB660686A (en) 1951-11-14

Family

ID=9010404

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2494/49A Expired GB660686A (en) 1948-02-06 1949-01-28 Improvements relating to telephone circuit signalling apparatus

Country Status (2)

Country Link
FR (1) FR962322A (ja)
GB (1) GB660686A (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973493C (de) * 1950-09-28 1960-03-10 Philips Nv Einseitenbandtraegerfrequenzfernsprechsystem
DE939820C (de) * 1952-05-06 1956-03-01 Siemens Ag Schaltungsanordnung zum Empfang von Spannungen einer oder mehrerer Signalfrequenzen
DE958570C (de) * 1952-11-03 1957-02-21 Standard Elek K Ag Empfangskanalverstaerker und Signalempfaenger mit gemeinsamer Verstaerkung der Signalfrequenz und des Sprachbandes

Also Published As

Publication number Publication date
FR962322A (ja) 1950-06-07

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