FR738959A - Improvements to electrical signaling systems - Google Patents

Improvements to electrical signaling systems

Info

Publication number
FR738959A
FR738959A FR738959DA FR738959A FR 738959 A FR738959 A FR 738959A FR 738959D A FR738959D A FR 738959DA FR 738959 A FR738959 A FR 738959A
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)
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 CO Ltd
Original Assignee
AUTOMATIC ELECTRIC CO Ltd
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 CO Ltd filed Critical AUTOMATIC ELECTRIC CO Ltd
Application granted granted Critical
Publication of FR738959A publication Critical patent/FR738959A/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
    • H04Q1/45—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
FR738959D 1931-07-15 1932-06-22 Improvements to electrical signaling systems Expired FR738959A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB20321/31A GB381960A (en) 1931-07-15 1931-07-15 Improvements in alternating current signal receivers
GB204932 1932-01-22

Publications (1)

Publication Number Publication Date
FR738959A true FR738959A (en) 1933-01-04

Family

ID=26237192

Family Applications (1)

Application Number Title Priority Date Filing Date
FR738959D Expired FR738959A (en) 1931-07-15 1932-06-22 Improvements to electrical signaling systems

Country Status (3)

Country Link
US (1) US1976096A (en)
FR (1) FR738959A (en)
GB (1) GB381960A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2438902A (en) * 1943-10-04 1948-04-06 Standard Telephones Cables Ltd Pulse multiplex system employing fixed pulse-time displacement for signaling
GB654674A (en) * 1948-04-09 1951-06-27 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
US2907012A (en) * 1955-12-30 1959-09-29 Pitman Duncan Sofar alarm

Also Published As

Publication number Publication date
US1976096A (en) 1934-10-09
GB381960A (en) 1932-10-17

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