FR939428A - Systèmes de transmission de communications secrètes - Google Patents

Systèmes de transmission de communications secrètes

Info

Publication number
FR939428A
FR939428A FR939428DA FR939428A FR 939428 A FR939428 A FR 939428A FR 939428D A FR939428D A FR 939428DA FR 939428 A FR939428 A FR 939428A
Authority
FR
France
Prior art keywords
transmission systems
communications transmission
secret communications
secret
systems
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)
Inventor
Prafulla Kumar Chatterjea
Leslie Wilfrid Hougton
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 GB1637841A external-priority patent/GB580843A/en
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of FR939428A publication Critical patent/FR939428A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/02—Amplitude modulation, i.e. PAM
    • 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
FR939428D 1941-12-18 1946-11-27 Systèmes de transmission de communications secrètes Expired FR939428A (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1637841A GB580843A (en) 1941-12-18 1941-12-18 Improvements in or relating to secrecy communication systems
GB1493842A GB582709A (en) 1941-12-18 1942-10-23 Improvements in or relating to secrecy communication systems

Publications (1)

Publication Number Publication Date
FR939428A true FR939428A (fr) 1948-11-15

Family

ID=32178905

Family Applications (2)

Application Number Title Priority Date Filing Date
FR939295D Expired FR939295A (fr) 1941-12-18 1946-08-29 Perfectionnements aux systèmes électriques de transmission d'un message secret
FR939428D Expired FR939428A (fr) 1941-12-18 1946-11-27 Systèmes de transmission de communications secrètes

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR939295D Expired FR939295A (fr) 1941-12-18 1946-08-29 Perfectionnements aux systèmes électriques de transmission d'un message secret

Country Status (3)

Country Link
US (1) US2412964A (fr)
BE (2) BE473048A (fr)
FR (2) FR939295A (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177485A (en) * 1944-09-06 1979-12-04 Prehn Lawrence D Facsimile apparatus
US2836657A (en) * 1944-11-20 1958-05-27 Gen Electric Secrecy communication system
US2460326A (en) * 1945-02-17 1949-02-01 Clarence M Woodruff Transmitter
US2466230A (en) * 1946-02-09 1949-04-05 Stromberg Carlson Co Pulse time modulation system
US2616975A (en) * 1947-02-06 1952-11-04 Rca Corp Time division multiplex system
US2589617A (en) * 1947-07-07 1952-03-18 Alfred C Kowalski Pulse amplitude modulation communication system
US3991268A (en) * 1948-12-24 1976-11-09 Bell Telephone Laboratories, Incorporated PCM communication system with pulse deletion
US2699544A (en) * 1949-03-30 1955-01-11 Olive S Petty Distance measuring system
US2664462A (en) * 1949-08-31 1953-12-29 Rca Corp Multiplexed signal transmission
US3569625A (en) * 1961-04-27 1971-03-09 Us Navy Telemetry data transmission system
BE646982A (fr) * 1963-04-23
FR95619E (fr) * 1966-05-05 1971-03-26 It Telecommunicazioni Siemens Systeme de transmission de signaux téléphoniques a allocation de temps.
IT1227123B (it) * 1988-09-30 1991-03-15 Samanta Italia S P A Procedimento e macchina per la sigillatura di fogli di carta

Also Published As

Publication number Publication date
US2412964A (en) 1946-12-24
BE471102A (fr)
BE473048A (fr)
FR939295A (fr) 1948-11-09

Similar Documents

Publication Publication Date Title
FR888195A (fr) Systèmes de transmission de signaux électriques
FR939428A (fr) Systèmes de transmission de communications secrètes
CH269659A (de) Telegraphenanlage.
FR932703A (fr) Perfectionnements aux systèmes de communications secrètes
FR939036A (fr) Systèmes de télégraphie en fac-similé
FR951032A (fr) Systèmes récepteurs radioélectriques
FR887810A (fr) Systèmes de transmission
FR867451A (fr) Systèmes de communications radioélectriques
FR838000A (fr) Systèmes de transmission avec secret
FR841895A (fr) Systèmes de transmission à secret
FR858682A (fr) Systèmes de communication de télévision
FR848805A (fr) Systèmes de télécommunications
FR867359A (fr) Systèmes de communications radioélectriques
FR946506A (fr) Systemes de transmission de communications
FR939087A (fr) Systèmes de communications électriques
FR946807A (fr) Systèmes de transmission de communications télégraphiques
FR867449A (fr) Systèmes de transmission
FR952147A (fr) Système de radio-émission
FR887180A (fr) Systèmes de communications électriques
FR833596A (fr) Systèmes de multiplication des communications télégraphiques ou téléphoniques
FR890235A (fr) Système de transmission de communications
FR858757A (fr) Systèmes de transmission électriques avec secret
CH227467A (de) Trägerfrequenzübertragungsanlage.
FR840151A (fr) Systèmes de communications télégraphiques
FR51182E (fr) Systèmes récepteurs de télévision