FR2432803A2 - Reseau de transmission a secret par commutation de frequence - Google Patents

Reseau de transmission a secret par commutation de frequence

Info

Publication number
FR2432803A2
FR2432803A2 FR7823067A FR7823067A FR2432803A2 FR 2432803 A2 FR2432803 A2 FR 2432803A2 FR 7823067 A FR7823067 A FR 7823067A FR 7823067 A FR7823067 A FR 7823067A FR 2432803 A2 FR2432803 A2 FR 2432803A2
Authority
FR
France
Prior art keywords
signal
frequency synthesiser
transmitter
switch
transmission system
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.)
Granted
Application number
FR7823067A
Other languages
English (en)
Other versions
FR2432803B2 (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.)
Socrat
Original Assignee
Socrat
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
Priority claimed from FR7625033A external-priority patent/FR2362537A1/fr
Application filed by Socrat filed Critical Socrat
Priority to FR7823067A priority Critical patent/FR2432803A2/fr
Publication of FR2432803A2 publication Critical patent/FR2432803A2/fr
Application granted granted Critical
Publication of FR2432803B2 publication Critical patent/FR2432803B2/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Réseau de transmission à secret par commutation de la fréquence de trafic d'un canal à un autre. Chaque émetteur récepteur est équipé d'un synthétiseur double de fréquence 12, 13, et de deux temporisateurs associés 16, 17. Une séquence de paires de signaux numériques (durée-fréquence) enregistrée en mémoire 4 est envoyée alternativement à deux mémoires tampons 10, 11. La préparation de chaque demi-synthétiseur en fréquence et durée d'émission est effectuée pendant que l'autre est couplé par le commutateur 19 à l'émetteur récepteur. La commutation peut s'effectuer en moins de 1 ms, tandis que l'accrochage du synthétiseur peut durer cent fois plus longtemps. Application aux réseaux où les transmissions doivent rester secrètes.
FR7823067A 1976-08-18 1978-08-04 Reseau de transmission a secret par commutation de frequence Granted FR2432803A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7823067A FR2432803A2 (fr) 1976-08-18 1978-08-04 Reseau de transmission a secret par commutation de frequence

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7625033A FR2362537A1 (fr) 1976-08-18 1976-08-18 Reseau de transmission a secret par commutation de frequence
FR7823067A FR2432803A2 (fr) 1976-08-18 1978-08-04 Reseau de transmission a secret par commutation de frequence

Publications (2)

Publication Number Publication Date
FR2432803A2 true FR2432803A2 (fr) 1980-02-29
FR2432803B2 FR2432803B2 (fr) 1983-08-26

Family

ID=26219599

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7823067A Granted FR2432803A2 (fr) 1976-08-18 1978-08-04 Reseau de transmission a secret par commutation de frequence

Country Status (1)

Country Link
FR (1) FR2432803A2 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2362537A1 (fr) * 1976-08-18 1978-03-17 Socrat Reseau de transmission a secret par commutation de frequence

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2362537A1 (fr) * 1976-08-18 1978-03-17 Socrat Reseau de transmission a secret par commutation de frequence

Also Published As

Publication number Publication date
FR2432803B2 (fr) 1983-08-26

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