FR838000A - Transmission systems with secrecy - Google Patents

Transmission systems with secrecy

Info

Publication number
FR838000A
FR838000A FR838000DA FR838000A FR 838000 A FR838000 A FR 838000A FR 838000D A FR838000D A FR 838000DA FR 838000 A FR838000 A FR 838000A
Authority
FR
France
Prior art keywords
secrecy
transmission systems
systems
transmission
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.)
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 FR838000A publication Critical patent/FR838000A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Radio Relay Systems (AREA)
FR838000D 1937-05-15 1938-05-14 Transmission systems with secrecy Expired FR838000A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US142815A US2107756A (en) 1937-05-15 1937-05-15 Privacy system

Publications (1)

Publication Number Publication Date
FR838000A true FR838000A (en) 1939-02-23

Family

ID=22501393

Family Applications (1)

Application Number Title Priority Date Filing Date
FR838000D Expired FR838000A (en) 1937-05-15 1938-05-14 Transmission systems with secrecy

Country Status (3)

Country Link
US (1) US2107756A (en)
FR (1) FR838000A (en)
GB (1) GB497198A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967066A (en) * 1941-09-24 1976-06-29 Bell Telephone Labor Inc ecret telephony
US3985958A (en) * 1941-12-18 1976-10-12 Bell Telephone Laboratories, Incorporated Secret telephony
US2836657A (en) * 1944-11-20 1958-05-27 Gen Electric Secrecy communication system
US2932693A (en) * 1956-01-18 1960-04-12 Salvox Corp Secret communication system
US2943152A (en) * 1957-11-07 1960-06-28 Joseph C R Licklider Audio pitch control
CH559483A5 (en) * 1973-06-12 1975-02-28 Patelhold Patentverwertung
DE2737576C1 (en) * 1977-08-22 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Military radar or radio communications system
US5036542A (en) * 1989-11-02 1991-07-30 Kehoe Brian D Audio surveillance discouragement apparatus and method

Also Published As

Publication number Publication date
US2107756A (en) 1938-02-08
GB497198A (en) 1938-12-14

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