ES176097A1 - MEJORAS EN O RELATIVAS A SISTEMAS DE TRANSMISIoN SECRETA - Google Patents

MEJORAS EN O RELATIVAS A SISTEMAS DE TRANSMISIoN SECRETA

Info

Publication number
ES176097A1
ES176097A1 ES0176097A ES176097A ES176097A1 ES 176097 A1 ES176097 A1 ES 176097A1 ES 0176097 A ES0176097 A ES 0176097A ES 176097 A ES176097 A ES 176097A ES 176097 A1 ES176097 A1 ES 176097A1
Authority
ES
Spain
Prior art keywords
relating
transmission systems
signals
secret transmission
sets
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
ES0176097A
Other languages
English (en)
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES176097A1 publication Critical patent/ES176097A1/es
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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Radio Relay Systems (AREA)
ES0176097A 1941-07-09 1946-12-14 MEJORAS EN O RELATIVAS A SISTEMAS DE TRANSMISIoN SECRETA Expired ES176097A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8643/41A GB580167A (en) 1941-07-09 1941-07-09 Improvements in or relating to secret transmission systems

Publications (1)

Publication Number Publication Date
ES176097A1 true ES176097A1 (es) 1947-01-16

Family

ID=9856430

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0176097A Expired ES176097A1 (es) 1941-07-09 1946-12-14 MEJORAS EN O RELATIVAS A SISTEMAS DE TRANSMISIoN SECRETA

Country Status (5)

Country Link
US (1) US2406841A (d)
BE (1) BE477658A (d)
ES (1) ES176097A1 (d)
FR (1) FR932703A (d)
GB (1) GB580167A (d)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466959A (en) * 1944-09-30 1949-04-12 Philco Corp Radio receiver noise discriminating circuit
US2953643A (en) * 1945-05-10 1960-09-20 Bell Telephone Labor Inc Inverted speech privacy using irregular inverting wave form
US2521690A (en) * 1945-08-14 1950-09-12 Standard Telephones Cables Ltd Secrecy preserving signaling system
US2556677A (en) * 1946-05-10 1951-06-12 Bell Telephone Labor Inc Secret communication system
US2510046A (en) * 1947-04-18 1950-05-30 Zenith Radio Corp Radio-wire signaling system
US2660666A (en) * 1950-01-05 1953-11-24 Westinghouse Electric Corp Secrecy transmission system
US4176316A (en) * 1953-03-30 1979-11-27 International Telephone & Telegraph Corp. Secure single sideband communication system using modulated noise subcarrier
USRE34004E (en) * 1953-03-30 1992-07-21 Itt Corporation Secure single sideband communication system using modulated noise subcarrier
US3225142A (en) * 1961-12-18 1965-12-21 Bell Telephone Labor Inc Privacy system
US4361729A (en) * 1968-01-24 1982-11-30 American Standard Inc. Narrowband analog message privacy system
US4805216A (en) * 1987-01-08 1989-02-14 Compfax Corporation Method and apparatus for continuously acknowledged link encrypting

Also Published As

Publication number Publication date
FR932703A (fr) 1948-03-31
US2406841A (en) 1946-09-03
GB580167A (en) 1946-08-29
BE477658A (d)

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