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PT74410B - TEILBANDVERTAUSCHUNGSVERFAHREN - Google Patents

TEILBANDVERTAUSCHUNGSVERFAHREN

Info

Publication number
PT74410B
PT74410B PT74410A PT7441082A PT74410B PT 74410 B PT74410 B PT 74410B PT 74410 A PT74410 A PT 74410A PT 7441082 A PT7441082 A PT 7441082A PT 74410 B PT74410 B PT 74410B
Authority
PT
Portugal
Prior art keywords
teilbandvertauschungsverfahren
Prior art date
Application number
PT74410A
Other languages
German (de)
Portuguese (pt)
Other versions
PT74410A (en
Original Assignee
Licentia Gmbh
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 Licentia Gmbh filed Critical Licentia Gmbh
Publication of PT74410A publication Critical patent/PT74410A/en
Publication of PT74410B publication Critical patent/PT74410B/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)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
PT74410A 1981-02-13 1982-02-10 TEILBANDVERTAUSCHUNGSVERFAHREN PT74410B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19813105214 DE3105214A1 (en) 1981-02-13 1981-02-13 "SUB-TAPE EXCHANGE PROCEDURE"

Publications (2)

Publication Number Publication Date
PT74410A PT74410A (en) 1982-03-01
PT74410B true PT74410B (en) 1983-10-28

Family

ID=6124771

Family Applications (1)

Application Number Title Priority Date Filing Date
PT74410A PT74410B (en) 1981-02-13 1982-02-10 TEILBANDVERTAUSCHUNGSVERFAHREN

Country Status (7)

Country Link
EP (1) EP0058318B1 (en)
CA (1) CA1186380A (en)
DE (2) DE3105214A1 (en)
DK (1) DK52682A (en)
ES (1) ES8302387A1 (en)
FI (1) FI820393L (en)
PT (1) PT74410B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408692A (en) * 1942-04-29 1946-10-01 Rca Corp Signaling system
CH248975A (en) * 1946-02-04 1947-05-31 Patelhold Patentverwertung Process and device for disguising the individual calls in a multi-channel system.
DE1273002B (en) * 1963-09-11 1968-07-18 Siemens Ag Device for the encrypted transmission of voice signals by interchanging subbands
DE2652607A1 (en) * 1976-11-19 1978-05-24 Licentia Gmbh Analogue information signal encoder - includes array of ring modulators and stores time and frequency multiplexed elements in digital form

Also Published As

Publication number Publication date
ES509565A0 (en) 1982-12-16
CA1186380A (en) 1985-04-30
EP0058318B1 (en) 1984-08-08
EP0058318A1 (en) 1982-08-25
DE3105214A1 (en) 1982-09-09
PT74410A (en) 1982-03-01
ES8302387A1 (en) 1982-12-16
DK52682A (en) 1982-08-14
DE3260506D1 (en) 1984-09-13
FI820393L (en) 1982-08-14

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