IE41265L - Camouflaged transmission of signals - Google Patents

Camouflaged transmission of signals

Info

Publication number
IE41265L
IE41265L IE751506A IE150675A IE41265L IE 41265 L IE41265 L IE 41265L IE 751506 A IE751506 A IE 751506A IE 150675 A IE150675 A IE 150675A IE 41265 L IE41265 L IE 41265L
Authority
IE
Ireland
Prior art keywords
interchange
july
determined
signal
signals
Prior art date
Application number
IE751506A
Other versions
IE41265B1 (en
Original Assignee
Siemens 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
Priority claimed from DE19742434877 external-priority patent/DE2434877C3/en
Application filed by Siemens Ag filed Critical Siemens Ag
Publication of IE41265L publication Critical patent/IE41265L/en
Publication of IE41265B1 publication Critical patent/IE41265B1/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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Transmitters (AREA)
  • Television Systems (AREA)

Abstract

1512696 Scrambling systems SIEMENS AG 7 July 1975 [19 July 1974] 28486/75 Heading H4R A (speech) signal is scrambled by interchanging sub-bands according to a sequence determined by a generator Z1 controlled by a pulse sequence in the form of a cyclic variation in pulse repetition frequency (derived by multiplexing at M frequencies divided in FT1-FT8 from a carrier generator TV whose output is fed via switched interchange pattern circuits UE to frequency shift the signal sub-bands) the duration of each interchange being determined at Z2 from the same pulse sequence as employed for the interchange. [GB1512696A]
IE1506/75A 1974-07-19 1975-07-07 Improvements in or relating to the camouflaged transmission of signals IE41265B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742434877 DE2434877C3 (en) 1974-07-19 Device for the disguised transmission of speech signals

Publications (2)

Publication Number Publication Date
IE41265L true IE41265L (en) 1976-01-19
IE41265B1 IE41265B1 (en) 1979-11-21

Family

ID=5921046

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1506/75A IE41265B1 (en) 1974-07-19 1975-07-07 Improvements in or relating to the camouflaged transmission of signals

Country Status (16)

Country Link
JP (1) JPS5826706B2 (en)
AT (1) AT341003B (en)
AU (1) AU501260B2 (en)
BE (1) BE831528A (en)
CH (1) CH596716A5 (en)
DK (1) DK140914C (en)
FR (1) FR2285029A1 (en)
GB (1) GB1512696A (en)
IE (1) IE41265B1 (en)
IL (1) IL47692A (en)
IN (1) IN147050B (en)
IT (1) IT1039917B (en)
LU (1) LU73007A1 (en)
NL (1) NL169664C (en)
SE (1) SE410259B (en)
ZA (1) ZA754406B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151886A (en) * 1983-12-21 1985-07-24 British Broadcasting Corp Conditional-access broadcast transmission
CA1226914A (en) * 1984-01-26 1987-09-15 The University Of British Columbia Modem for pseudo noise communication on a.c. lines
JP2761281B2 (en) * 1990-05-17 1998-06-04 富士通株式会社 Encrypted communication method for multi-carrier communication system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1278172A (en) * 1960-10-28 1961-12-08 Cie Ind Des Telephones Electronic coding device for radio or telephone links
FR2129013A5 (en) * 1971-03-11 1972-10-27 Snecma
GB1465923A (en) * 1973-04-03 1977-03-02 Siemens Ag Camouflaged speech signal transmission systems

Also Published As

Publication number Publication date
DE2434877A1 (en) 1976-01-29
AU501260B2 (en) 1979-06-14
FR2285029A1 (en) 1976-04-09
DK140914B (en) 1979-12-03
NL169664B (en) 1982-03-01
IE41265B1 (en) 1979-11-21
DE2434877B2 (en) 1976-05-13
CH596716A5 (en) 1978-03-15
SE7508246L (en) 1976-01-20
LU73007A1 (en) 1976-07-01
FR2285029B1 (en) 1977-12-16
JPS5134603A (en) 1976-03-24
GB1512696A (en) 1978-06-01
SE410259B (en) 1979-10-01
BE831528A (en) 1976-01-19
DK328275A (en) 1976-01-20
ATA526575A (en) 1977-05-15
IN147050B (en) 1979-10-27
DK140914C (en) 1980-05-12
IT1039917B (en) 1979-12-10
AU8290875A (en) 1977-01-13
IL47692A (en) 1977-11-30
NL169664C (en) 1982-08-02
NL7508643A (en) 1976-01-21
ZA754406B (en) 1976-06-30
JPS5826706B2 (en) 1983-06-04
AT341003B (en) 1978-01-10
IL47692A0 (en) 1975-12-31

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