GB1465393A - Method and apparatus for the scrambled transmission of speech via a telephony channel - Google Patents

Method and apparatus for the scrambled transmission of speech via a telephony channel

Info

Publication number
GB1465393A
GB1465393A GB641174A GB641174A GB1465393A GB 1465393 A GB1465393 A GB 1465393A GB 641174 A GB641174 A GB 641174A GB 641174 A GB641174 A GB 641174A GB 1465393 A GB1465393 A GB 1465393A
Authority
GB
United Kingdom
Prior art keywords
bands
speech
modulation
echo
code
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
GB641174A
Other languages
English (en)
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.)
Gretag AG
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
Publication of GB1465393A publication Critical patent/GB1465393A/en
Expired legal-status Critical Current

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
GB641174A 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of speech via a telephony channel Expired GB1465393A (en)

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
GB1465393A true GB1465393A (en) 1977-02-23

Family

ID=4224178

Family Applications (1)

Application Number Title Priority Date Filing Date
GB641174A Expired GB1465393A (en) 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of speech via a telephony channel

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
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
IT1019573B (it) 1977-11-30
JPS49119502A (xx) 1974-11-15
FR2217875B1 (xx) 1978-05-12
CH574692A5 (xx) 1976-04-15

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee