FR933246A - Improvements to electrical signaling systems - Google Patents

Improvements to electrical signaling systems

Info

Publication number
FR933246A
FR933246A FR933246DA FR933246A FR 933246 A FR933246 A FR 933246A FR 933246D A FR933246D A FR 933246DA FR 933246 A FR933246 A FR 933246A
Authority
FR
France
Prior art keywords
signaling systems
electrical signaling
electrical
systems
signaling
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
Other languages
French (fr)
Inventor
Frank Fairley
Raymond Walsh
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of FR933246A publication Critical patent/FR933246A/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)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Amplifiers (AREA)
FR933246D 1941-09-15 1946-09-04 Improvements to electrical signaling systems Expired FR933246A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11782/41A GB551951A (en) 1941-09-15 1941-09-15 Improvements in or relating to electric signalling systems

Publications (1)

Publication Number Publication Date
FR933246A true FR933246A (en) 1948-04-14

Family

ID=27799776

Family Applications (1)

Application Number Title Priority Date Filing Date
FR933246D Expired FR933246A (en) 1941-09-15 1946-09-04 Improvements to electrical signaling systems

Country Status (6)

Country Link
US (1) US2343759A (en)
BE (1) BE479786A (en)
CH (1) CH254957A (en)
FR (1) FR933246A (en)
GB (1) GB551951A (en)
NL (1) NL70720C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476311A (en) * 1943-02-01 1949-07-19 Sperry Corp Ultra high frequency discriminator and apparatus
US2533286A (en) * 1946-07-22 1950-12-12 Univ Minnesota Heat sensitive circuits
BE481448A (en) * 1947-02-07
US2706272A (en) * 1949-11-03 1955-04-12 Jones Lloyd Voltage stabilizing circuit
US2801290A (en) * 1951-09-17 1957-07-30 Telefunken Gmbh Calling signal responder arrangements
US2957950A (en) * 1954-11-18 1960-10-25 Bell Telephone Labor Inc Transistor selective ringing circuit
US2987713A (en) * 1957-07-12 1961-06-06 Kidde & Co Walter Sensitivity control of apparatus for detecting distrubances in an enclosure

Also Published As

Publication number Publication date
GB551951A (en) 1943-03-17
BE479786A (en)
NL70720C (en)
CH254957A (en) 1948-05-31
US2343759A (en) 1944-03-07

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