IE41265B1 - Improvements in or relating to the camouflaged transmission of signals - Google Patents
Improvements in or relating to the camouflaged transmission of signalsInfo
- Publication number
- IE41265B1 IE41265B1 IE1506/75A IE150675A IE41265B1 IE 41265 B1 IE41265 B1 IE 41265B1 IE 1506/75 A IE1506/75 A IE 1506/75A IE 150675 A IE150675 A IE 150675A IE 41265 B1 IE41265 B1 IE 41265B1
- Authority
- IE
- Ireland
- Prior art keywords
- interchange
- july
- relating
- signals
- determined
- Prior art date
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)
- Television Systems (AREA)
- Transmitters (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]
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 IE41265L (en) | 1976-01-19 |
| IE41265B1 true 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)
| 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)
| 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 |
-
1975
- 1975-07-03 CH CH866075A patent/CH596716A5/xx not_active IP Right Cessation
- 1975-07-07 GB GB28486/75A patent/GB1512696A/en not_active Expired
- 1975-07-07 IE IE1506/75A patent/IE41265B1/en unknown
- 1975-07-08 AT AT526575A patent/AT341003B/en not_active IP Right Cessation
- 1975-07-09 ZA ZA00754406A patent/ZA754406B/en unknown
- 1975-07-10 AU AU82908/75A patent/AU501260B2/en not_active Expired
- 1975-07-11 IL IL47692A patent/IL47692A/en unknown
- 1975-07-16 FR FR7522195A patent/FR2285029A1/en active Granted
- 1975-07-17 LU LU73007A patent/LU73007A1/xx unknown
- 1975-07-18 DK DK328275A patent/DK140914C/en not_active IP Right Cessation
- 1975-07-18 NL NLAANVRAGE7508643,A patent/NL169664C/en not_active IP Right Cessation
- 1975-07-18 JP JP50088189A patent/JPS5826706B2/en not_active Expired
- 1975-07-18 IT IT25534/75A patent/IT1039917B/en active
- 1975-07-18 BE BE158435A patent/BE831528A/en not_active IP Right Cessation
- 1975-07-18 SE SE7508246A patent/SE410259B/en unknown
-
1976
- 1976-04-13 IN IN632/CAL/76A patent/IN147050B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL169664C (en) | 1982-08-02 |
| IE41265L (en) | 1976-01-19 |
| AT341003B (en) | 1978-01-10 |
| DK140914B (en) | 1979-12-03 |
| NL169664B (en) | 1982-03-01 |
| ATA526575A (en) | 1977-05-15 |
| DE2434877B2 (en) | 1976-05-13 |
| GB1512696A (en) | 1978-06-01 |
| CH596716A5 (en) | 1978-03-15 |
| IL47692A (en) | 1977-11-30 |
| AU8290875A (en) | 1977-01-13 |
| FR2285029B1 (en) | 1977-12-16 |
| FR2285029A1 (en) | 1976-04-09 |
| SE7508246L (en) | 1976-01-20 |
| DE2434877A1 (en) | 1976-01-29 |
| DK328275A (en) | 1976-01-20 |
| SE410259B (en) | 1979-10-01 |
| LU73007A1 (en) | 1976-07-01 |
| AU501260B2 (en) | 1979-06-14 |
| DK140914C (en) | 1980-05-12 |
| NL7508643A (en) | 1976-01-21 |
| BE831528A (en) | 1976-01-19 |
| JPS5134603A (en) | 1976-03-24 |
| IT1039917B (en) | 1979-12-10 |
| IL47692A0 (en) | 1975-12-31 |
| IN147050B (en) | 1979-10-27 |
| JPS5826706B2 (en) | 1983-06-04 |
| ZA754406B (en) | 1976-06-30 |
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