FR939295A - Improvements to electrical systems for transmitting a secret message - Google Patents

Improvements to electrical systems for transmitting a secret message

Info

Publication number
FR939295A
FR939295A FR939295DA FR939295A FR 939295 A FR939295 A FR 939295A FR 939295D A FR939295D A FR 939295DA FR 939295 A FR939295 A FR 939295A
Authority
FR
France
Prior art keywords
transmitting
electrical systems
secret message
secret
message
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)
Inventor
Prafulla Kumar Chatterjea
Leslie Wilfred Houghton
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 FR939295A publication Critical patent/FR939295A/en
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
FR939295D 1941-12-18 1946-08-29 Improvements to electrical systems for transmitting a secret message Expired FR939295A (en)

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
FR939295A true FR939295A (en) 1948-11-09

Family

ID=32178905

Family Applications (2)

Application Number Title Priority Date Filing Date
FR939295D Expired FR939295A (en) 1941-12-18 1946-08-29 Improvements to electrical systems for transmitting a secret message
FR939428D Expired FR939428A (en) 1941-12-18 1946-11-27 Secret communications transmission systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR939428D Expired FR939428A (en) 1941-12-18 1946-11-27 Secret communications transmission systems

Country Status (3)

Country Link
US (1) US2412964A (en)
BE (2) BE471102A (en)
FR (2) FR939295A (en)

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 (en) * 1963-04-23
FR95619E (en) * 1966-05-05 1971-03-26 It Telecommunicazioni Siemens Time-allocated telephone signal transmission system.
IT1227123B (en) * 1988-09-30 1991-03-15 Samanta Italia S P A PROCEDURE AND MACHINE FOR SEALING PAPER SHEETS

Also Published As

Publication number Publication date
BE473048A (en)
US2412964A (en) 1946-12-24
FR939428A (en) 1948-11-15
BE471102A (en)

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