FR947898A - Systèmes de signalisation à courant alternatif - Google Patents

Systèmes de signalisation à courant alternatif

Info

Publication number
FR947898A
FR947898A FR947898DA FR947898A FR 947898 A FR947898 A FR 947898A FR 947898D A FR947898D A FR 947898DA FR 947898 A FR947898 A FR 947898A
Authority
FR
France
Prior art keywords
signaling systems
signaling
systems
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
English (en)
Inventor
Esmond Philip Goodwin Wright
William John Reynolds
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 FR947898A publication Critical patent/FR947898A/fr
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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
FR947898D 1939-08-16 1947-06-13 Systèmes de signalisation à courant alternatif Expired FR947898A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB268998X 1939-08-16

Publications (1)

Publication Number Publication Date
FR947898A true FR947898A (fr) 1949-07-15

Family

ID=10250964

Family Applications (1)

Application Number Title Priority Date Filing Date
FR947898D Expired FR947898A (fr) 1939-08-16 1947-06-13 Systèmes de signalisation à courant alternatif

Country Status (5)

Country Link
US (1) US2593512A (fr)
BE (1) BE476047A (fr)
CH (1) CH268998A (fr)
FR (1) FR947898A (fr)
GB (1) GB534023A (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1575272A (en) * 1923-10-31 1926-03-02 Western Electric Co Telephone system
US2188461A (en) * 1935-06-11 1940-01-30 Ass Telephone & Telegraph Co Mechanical impulse repeater
GB489545A (en) * 1937-01-25 1938-07-25 Standard Telephones Cables Ltd Improvements in or relating to electrical communication systems

Also Published As

Publication number Publication date
CH268998A (de) 1950-06-15
GB534023A (en) 1941-02-26
BE476047A (fr)
US2593512A (en) 1952-04-22

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