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FR1169671A - Improvements to telephone communications systems - Google Patents

Improvements to telephone communications systems

Info

Publication number
FR1169671A
FR1169671A FR1169671DA FR1169671A FR 1169671 A FR1169671 A FR 1169671A FR 1169671D A FR1169671D A FR 1169671DA FR 1169671 A FR1169671 A FR 1169671A
Authority
FR
France
Prior art keywords
communications systems
telephone communications
telephone
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
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR1169671A publication Critical patent/FR1169671A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
FR1169671D 1957-03-08 1957-03-08 Improvements to telephone communications systems Expired FR1169671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1169671T 1957-03-08

Publications (1)

Publication Number Publication Date
FR1169671A true FR1169671A (en) 1959-01-05

Family

ID=9656653

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1169671D Expired FR1169671A (en) 1957-03-08 1957-03-08 Improvements to telephone communications systems

Country Status (1)

Country Link
FR (1) FR1169671A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181749B (en) * 1960-03-31 1964-11-19 Siemens Ag Method for message encryption
FR2217875A1 (en) * 1973-02-13 1974-09-06 Gretag Ag
FR2236321A1 (en) * 1973-07-02 1975-01-31 Gretag Ag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181749B (en) * 1960-03-31 1964-11-19 Siemens Ag Method for message encryption
FR2217875A1 (en) * 1973-02-13 1974-09-06 Gretag Ag
FR2236321A1 (en) * 1973-07-02 1975-01-31 Gretag Ag

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