IT1019573B - Apparecchiatura per la trasmissione mascherata di un messaggio in parole attraverso un canale telefonico - Google Patents

Apparecchiatura per la trasmissione mascherata di un messaggio in parole attraverso un canale telefonico

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
English (en)
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/it

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
IT20723/74A 1973-02-13 1974-04-08 Apparecchiatura per la trasmissione mascherata di un messaggio in parole attraverso un canale telefonico IT1019573B (it)

Applications Claiming Priority (1)

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

Publications (1)

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

Family

ID=4224178

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20723/74A IT1019573B (it) 1973-02-13 1974-04-08 Apparecchiatura per la trasmissione mascherata di un messaggio in parole attraverso un canale telefonico

Country Status (11)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2318247C3 (de) * 1973-04-11 1981-03-26 Siemens AG, 1000 Berlin und 8000 München Einrichtung zur verschleierten Übertragung von Sprachsignalen
JPS5824984B2 (ja) * 1976-06-02 1983-05-24 三菱電機株式会社 秘話装置

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 (fr) * 1948-10-27 1951-03-28 Radio Electr Soc Fr Système de communication téléphonique à secret
FR1169671A (fr) * 1957-03-08 1959-01-05 Thomson Houston Comp Francaise Perfectionnements aux systèmes de communications téléphoniques
CH361597A (de) * 1958-08-23 1962-04-30 Patelhold Patentverwertung Verfahren zur Verschleierung von Nachrichtensignalen
US3225142A (en) * 1961-12-18 1965-12-21 Bell Telephone Labor Inc Privacy system
FR95619E (fr) * 1966-05-05 1971-03-26 It Telecommunicazioni Siemens Systeme de transmission de signaux téléphoniques a allocation de temps.
CH499932A (de) * 1968-02-12 1970-11-30 Patelhold Patentverwertung Synchronisierverfahren für programmgesteuerte Trägerumtastung
CH518658A (de) * 1970-07-07 1972-01-31 Patelhold Patentverwaltungs Un Verfahren zur verschlüsselten Nachrichtenübermittlung durch zeitliche Vertauschung von Informationselementen
FR2129013A5 (xx) * 1971-03-11 1972-10-27 Snecma

Also Published As

Publication number Publication date
DE2318489A1 (de) 1974-08-15
DE2318489B2 (de) 1979-05-03
NO740416L (no) 1974-08-14
FR2217875A1 (xx) 1974-09-06
SE392556B (sv) 1977-03-28
NO140401B (no) 1979-05-14
GB1465393A (en) 1977-02-23
CA1003137A (en) 1977-01-04
ZA74916B (en) 1974-12-24
NL7401441A (xx) 1974-08-15
NO140401C (no) 1979-08-22
DE2318489C3 (de) 1982-12-23
JPS49119502A (xx) 1974-11-15
FR2217875B1 (xx) 1978-05-12
CH574692A5 (xx) 1976-04-15

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