IT1019573B - EQUIPMENT FOR THE MASKED TRANSMISSION OF A WORD MESSAGE THROUGH A TELEPHONE CHANNEL - Google Patents

EQUIPMENT FOR THE MASKED TRANSMISSION OF A WORD MESSAGE THROUGH A TELEPHONE CHANNEL

Info

Publication number
IT1019573B
IT1019573B IT20723/74A IT2072374A IT1019573B IT 1019573 B IT1019573 B IT 1019573B IT 20723/74 A IT20723/74 A IT 20723/74A IT 2072374 A IT2072374 A IT 2072374A IT 1019573 B IT1019573 B IT 1019573B
Authority
IT
Italy
Prior art keywords
equipment
word message
telephone channel
masked
transmission
Prior art date
Application number
IT20723/74A
Other languages
Italian (it)
Original Assignee
Gretag Ag
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 Gretag Ag filed Critical Gretag Ag
Application granted granted Critical
Publication of IT1019573B publication Critical patent/IT1019573B/en

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)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
IT20723/74A 1973-02-13 1974-04-08 EQUIPMENT FOR THE MASKED TRANSMISSION OF A WORD MESSAGE THROUGH A TELEPHONE CHANNEL IT1019573B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH202673A CH574692A5 (en) 1973-02-13 1973-02-13

Publications (1)

Publication Number Publication Date
IT1019573B true IT1019573B (en) 1977-11-30

Family

ID=4224178

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20723/74A IT1019573B (en) 1973-02-13 1974-04-08 EQUIPMENT FOR THE MASKED TRANSMISSION OF A WORD MESSAGE THROUGH A TELEPHONE CHANNEL

Country Status (11)

Country Link
JP (1) JPS49119502A (en)
CA (1) CA1003137A (en)
CH (1) CH574692A5 (en)
DE (1) DE2318489C3 (en)
FR (1) FR2217875B1 (en)
GB (1) GB1465393A (en)
IT (1) IT1019573B (en)
NL (1) NL7401441A (en)
NO (1) NO140401C (en)
SE (1) SE392556B (en)
ZA (1) ZA74916B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318247C3 (en) * 1973-04-11 1981-03-26 Siemens AG, 1000 Berlin und 8000 München Device for the disguised transmission of speech signals
JPS5824984B2 (en) * 1976-06-02 1983-05-24 三菱電機株式会社 Confidential device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1620656A (en) * 1924-12-01 1927-03-15 Western Electric Co Carrier-wave signaling system
US3201517A (en) * 1944-04-12 1965-08-17 Bell Telephone Labor Inc Privacy communication system
FR977153A (en) * 1948-10-27 1951-03-28 Radio Electr Soc Fr Secret telephone communication system
FR1169671A (en) * 1957-03-08 1959-01-05 Thomson Houston Comp Francaise Improvements to telephone communications systems
CH361597A (en) * 1958-08-23 1962-04-30 Patelhold Patentverwertung Method for obfuscating message signals
US3225142A (en) * 1961-12-18 1965-12-21 Bell Telephone Labor Inc Privacy system
FR95619E (en) * 1966-05-05 1971-03-26 It Telecommunicazioni Siemens Time-allocated telephone signal transmission system.
CH499932A (en) * 1968-02-12 1970-11-30 Patelhold Patentverwertung Synchronization method for program-controlled carrier shift keying
CH518658A (en) * 1970-07-07 1972-01-31 Patelhold Patentverwaltungs Un Process for encrypted message transmission by interchanging information elements over time
FR2129013A5 (en) * 1971-03-11 1972-10-27 Snecma

Also Published As

Publication number Publication date
SE392556B (en) 1977-03-28
FR2217875B1 (en) 1978-05-12
NO140401C (en) 1979-08-22
NL7401441A (en) 1974-08-15
DE2318489C3 (en) 1982-12-23
ZA74916B (en) 1974-12-24
NO740416L (en) 1974-08-14
DE2318489A1 (en) 1974-08-15
NO140401B (en) 1979-05-14
FR2217875A1 (en) 1974-09-06
CA1003137A (en) 1977-01-04
DE2318489B2 (en) 1979-05-03
JPS49119502A (en) 1974-11-15
CH574692A5 (en) 1976-04-15
GB1465393A (en) 1977-02-23

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