CA1186380A - Methode de transposition de sous-bandes - Google Patents
Methode de transposition de sous-bandesInfo
- Publication number
- CA1186380A CA1186380A CA000395659A CA395659A CA1186380A CA 1186380 A CA1186380 A CA 1186380A CA 000395659 A CA000395659 A CA 000395659A CA 395659 A CA395659 A CA 395659A CA 1186380 A CA1186380 A CA 1186380A
- Authority
- CA
- Canada
- Prior art keywords
- sub
- modulators
- bands
- band
- frequency
- 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
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)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3105214.2 | 1981-02-13 | ||
DE19813105214 DE3105214A1 (de) | 1981-02-13 | 1981-02-13 | "teilbandvertauschungsverfahren" |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1186380A true CA1186380A (fr) | 1985-04-30 |
Family
ID=6124771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000395659A Expired CA1186380A (fr) | 1981-02-13 | 1982-02-05 | Methode de transposition de sous-bandes |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0058318B1 (fr) |
CA (1) | CA1186380A (fr) |
DE (2) | DE3105214A1 (fr) |
DK (1) | DK52682A (fr) |
ES (1) | ES8302387A1 (fr) |
FI (1) | FI820393L (fr) |
PT (1) | PT74410B (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6424648A (en) * | 1987-07-21 | 1989-01-26 | Fujitsu Ltd | Privacy call equipment |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2408692A (en) * | 1942-04-29 | 1946-10-01 | Rca Corp | Signaling system |
CH248975A (de) * | 1946-02-04 | 1947-05-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung der einzelnen Gespräche einer Mehrkanalanlage. |
DE1273002B (de) * | 1963-09-11 | 1968-07-18 | Siemens Ag | Einrichtung zur verschluesselten UEbertragung von Sprachsignalen durch Vertauschung von Teilbaendern |
DE2652607A1 (de) * | 1976-11-19 | 1978-05-24 | Licentia Gmbh | Verfahren zum verschleierten uebertragen von nachrichtensignalen |
-
1981
- 1981-02-13 DE DE19813105214 patent/DE3105214A1/de not_active Withdrawn
-
1982
- 1982-01-29 DE DE8282100607T patent/DE3260506D1/de not_active Expired
- 1982-01-29 EP EP82100607A patent/EP0058318B1/fr not_active Expired
- 1982-02-05 CA CA000395659A patent/CA1186380A/fr not_active Expired
- 1982-02-08 DK DK52682A patent/DK52682A/da not_active Application Discontinuation
- 1982-02-08 FI FI820393A patent/FI820393L/fi not_active Application Discontinuation
- 1982-02-10 PT PT74410A patent/PT74410B/pt unknown
- 1982-02-12 ES ES509565A patent/ES8302387A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES509565A0 (es) | 1982-12-16 |
PT74410A (de) | 1982-03-01 |
EP0058318B1 (fr) | 1984-08-08 |
ES8302387A1 (es) | 1982-12-16 |
EP0058318A1 (fr) | 1982-08-25 |
FI820393L (fi) | 1982-08-14 |
DE3105214A1 (de) | 1982-09-09 |
DE3260506D1 (en) | 1984-09-13 |
DK52682A (da) | 1982-08-14 |
PT74410B (de) | 1983-10-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry |