FR854916A - Systèmes de communications électriques - Google Patents

Systèmes de communications électriques

Info

Publication number
FR854916A
FR854916A FR854916DA FR854916A FR 854916 A FR854916 A FR 854916A FR 854916D A FR854916D A FR 854916DA FR 854916 A FR854916 A FR 854916A
Authority
FR
France
Prior art keywords
communications systems
electrical communications
electrical
systems
communications
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)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR854916A publication Critical patent/FR854916A/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)
  • Telephonic Communication Services (AREA)
FR854916D 1938-05-20 1939-05-17 Systèmes de communications électriques Expired FR854916A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1510238A GB516114A (en) 1938-05-20 1938-05-20 Improvements in or relating to alternating current signalling systems

Publications (1)

Publication Number Publication Date
FR854916A true FR854916A (fr) 1940-04-27

Family

ID=10053070

Family Applications (1)

Application Number Title Priority Date Filing Date
FR854916D Expired FR854916A (fr) 1938-05-20 1939-05-17 Systèmes de communications électriques

Country Status (4)

Country Link
BE (1) BE434428A (fr)
FR (1) FR854916A (fr)
GB (1) GB516114A (fr)
NL (1) NL58054C (fr)

Also Published As

Publication number Publication date
BE434428A (fr)
NL58054C (fr)
GB516114A (en) 1939-12-22

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