CA1003137A - Method and apparatus for the scrambled transmission of spoken information via a telephony channel - Google Patents

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

Info

Publication number
CA1003137A
CA1003137A CA192,326A CA192326A CA1003137A CA 1003137 A CA1003137 A CA 1003137A CA 192326 A CA192326 A CA 192326A CA 1003137 A CA1003137 A CA 1003137A
Authority
CA
Canada
Prior art keywords
information via
spoken information
telephony channel
scrambled transmission
scrambled
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
CA192,326A
Other languages
English (en)
Inventor
Pierre Schmid
Eduard Brunner
Walter Stofer
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
Application granted granted Critical
Publication of CA1003137A publication Critical patent/CA1003137A/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

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)
CA192,326A 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of spoken information via a telephony channel Expired CA1003137A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
CA1003137A true CA1003137A (en) 1977-01-04

Family

ID=4224178

Family Applications (1)

Application Number Title Priority Date Filing Date
CA192,326A Expired CA1003137A (en) 1973-02-13 1974-02-12 Method and apparatus for the scrambled transmission of spoken information via a telephony channel

Country Status (11)

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

Families Citing this family (3)

* 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
CN115529214B (zh) * 2022-08-19 2025-05-02 北京邮电大学 加扰互补码正交频分复用通感一体化信号设计方法

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 (enrdf_load_stackoverflow) * 1971-03-11 1972-10-27 Snecma

Also Published As

Publication number Publication date
GB1465393A (en) 1977-02-23
NO140401C (no) 1979-08-22
ZA74916B (en) 1974-12-24
DE2318489C3 (de) 1982-12-23
NO140401B (no) 1979-05-14
DE2318489B2 (de) 1979-05-03
FR2217875A1 (enrdf_load_stackoverflow) 1974-09-06
NO740416L (no) 1974-08-14
JPS49119502A (enrdf_load_stackoverflow) 1974-11-15
SE392556B (sv) 1977-03-28
FR2217875B1 (enrdf_load_stackoverflow) 1978-05-12
NL7401441A (enrdf_load_stackoverflow) 1974-08-15
CH574692A5 (enrdf_load_stackoverflow) 1976-04-15
IT1019573B (it) 1977-11-30
DE2318489A1 (de) 1974-08-15

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