CH574692A5 - - Google Patents

Info

Publication number
CH574692A5
CH574692A5 CH202673A CH202673A CH574692A5 CH 574692 A5 CH574692 A5 CH 574692A5 CH 202673 A CH202673 A CH 202673A CH 202673 A CH202673 A CH 202673A CH 574692 A5 CH574692 A5 CH 574692A5
Authority
CH
Switzerland
Application number
CH202673A
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
Priority to CH202673A priority Critical patent/CH574692A5/xx
Priority to DE2318489A priority patent/DE2318489C3/en
Priority to SE7400265A priority patent/SE392556B/en
Priority to NL7401441A priority patent/NL7401441A/xx
Priority to NO740416A priority patent/NO140401C/en
Priority to CA192,326A priority patent/CA1003137A/en
Priority to GB641174A priority patent/GB1465393A/en
Priority to FR7404708A priority patent/FR2217875B1/fr
Priority to ZA740916A priority patent/ZA74916B/en
Priority to JP49017525A priority patent/JPS49119502A/ja
Priority to IT20723/74A priority patent/IT1019573B/en
Priority to US05/660,925 priority patent/US4068094A/en
Publication of CH574692A5 publication Critical patent/CH574692A5/xx

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)
CH202673A 1973-02-13 1973-02-13 CH574692A5 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
CH202673A CH574692A5 (en) 1973-02-13 1973-02-13
DE2318489A DE2318489C3 (en) 1973-02-13 1973-04-12 Method and arrangement for the disguised transmission of spoken information over a telephony channel
SE7400265A SE392556B (en) 1973-02-13 1974-01-09 METHOD OF MASKING, SENDING, RECEIVING AND DEMASKING VOICE INFORMATION AND FACILITIES FOR IMPLEMENTING THE SET
NL7401441A NL7401441A (en) 1973-02-13 1974-02-01
NO740416A NO140401C (en) 1973-02-13 1974-02-07 METHOD AND FACILITIES FOR EXPLANATION, TRANSMISSION, RECEPTION AND CLEARANCE OF SPEECH INFORMATION
CA192,326A CA1003137A (en) 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of spoken information via a telephony channel
GB641174A GB1465393A (en) 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of speech via a telephony channel
FR7404708A FR2217875B1 (en) 1973-02-13 1974-02-12
ZA740916A ZA74916B (en) 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of spoken information via a telephony channel
JP49017525A JPS49119502A (en) 1973-02-13 1974-02-13
IT20723/74A IT1019573B (en) 1973-02-13 1974-04-08 EQUIPMENT FOR THE MASKED TRANSMISSION OF A WORD MESSAGE THROUGH A TELEPHONE CHANNEL
US05/660,925 US4068094A (en) 1973-02-13 1976-02-24 Method and apparatus for the scrambled transmission of spoken information via a telephony channel

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
CH574692A5 true CH574692A5 (en) 1976-04-15

Family

ID=4224178

Family Applications (1)

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

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
NO140401C (en) 1979-08-22
NL7401441A (en) 1974-08-15
DE2318489C3 (en) 1982-12-23
FR2217875B1 (en) 1978-05-12
NO740416L (en) 1974-08-14
DE2318489A1 (en) 1974-08-15
GB1465393A (en) 1977-02-23
IT1019573B (en) 1977-11-30
NO140401B (en) 1979-05-14
DE2318489B2 (en) 1979-05-03
SE392556B (en) 1977-03-28
JPS49119502A (en) 1974-11-15
CA1003137A (en) 1977-01-04
FR2217875A1 (en) 1974-09-06
ZA74916B (en) 1974-12-24

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Legal Events

Date Code Title Description
PL Patent ceased