[go: up one dir, main page]

FR977153A - Système de communication téléphonique à secret - Google Patents

Système de communication téléphonique à secret

Info

Publication number
FR977153A
FR977153A FR977153DA FR977153A FR 977153 A FR977153 A FR 977153A FR 977153D A FR977153D A FR 977153DA FR 977153 A FR977153 A FR 977153A
Authority
FR
France
Prior art keywords
communication system
telephone communication
secret telephone
secret
telephone
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.)
Societe Francaise Radio Electrique
Original Assignee
Societe Francaise Radio Electrique
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 Societe Francaise Radio Electrique filed Critical Societe Francaise Radio Electrique
Application granted granted Critical
Publication of FR977153A publication Critical patent/FR977153A/fr
Expired legal-status Critical Current

Links

Classifications

    • 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)
FR977153D 1948-10-27 1948-10-27 Système de communication téléphonique à secret Expired FR977153A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR977153T 1948-10-27

Publications (1)

Publication Number Publication Date
FR977153A true FR977153A (fr) 1951-03-28

Family

ID=9519452

Family Applications (1)

Application Number Title Priority Date Filing Date
FR977153D Expired FR977153A (fr) 1948-10-27 1948-10-27 Système de communication téléphonique à secret

Country Status (1)

Country Link
FR (1) FR977153A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2217875A1 (fr) * 1973-02-13 1974-09-06 Gretag Ag
FR2236321A1 (fr) * 1973-07-02 1975-01-31 Gretag Ag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2217875A1 (fr) * 1973-02-13 1974-09-06 Gretag Ag
FR2236321A1 (fr) * 1973-07-02 1975-01-31 Gretag Ag

Similar Documents

Publication Publication Date Title
NL150641B (nl) Data-transmissiestelsel.
CH291689A (de) Telegraphieempfänger.
CH275635A (de) Automatische Telephonregistrieranlage.
CH274389A (fr) Installation téléphonique à haut-parleurs et à deux voies distinctes.
CH283262A (fr) Installation téléphonique bilatérale en haut-parleur.
CH282893A (fr) Installation de communication.
CH295259A (fr) Installation de communication à courants porteurs.
FR977153A (fr) Système de communication téléphonique à secret
FR64104E (fr) Système téléphonique tout-relais
CH273565A (de) Zeitmultiplexanlage.
FR970914A (fr) Système téléphonique d'intercommunication
FR988281A (fr) Système de commutation téléphonique
CH304203A (de) Fernmeldeanlage.
CH280332A (de) Telephonstation.
CH271526A (de) Telephonapparat.
BE486835A (fr) Systeme de telecommunication.
FR992007A (fr) Système de télégraphie
FR1010457A (fr) Système de télévision
CH271784A (de) Telephonapparat.
FR985680A (fr) Système de bureaux de télécommunications
CH285300A (fr) Installation téléphonique bilatérale en haut-parleur.
FR987599A (fr) Dispositif de téléphonie secrète
CH301277A (fr) Installation téléphonique.
DK75049C (da) Telefonabonnentapparat.
FR978646A (fr) Système téléphonique d'intercommunication