ES509565A0 - PROCEDURE FOR THE EXCHANGE OF PARTIAL BANDS, OF THE SAME WIDTH, OF A SIGNAL FREQUENCY BAND, THROUGH MODULATORS. - Google Patents

PROCEDURE FOR THE EXCHANGE OF PARTIAL BANDS, OF THE SAME WIDTH, OF A SIGNAL FREQUENCY BAND, THROUGH MODULATORS.

Info

Publication number
ES509565A0
ES509565A0 ES509565A ES509565A ES509565A0 ES 509565 A0 ES509565 A0 ES 509565A0 ES 509565 A ES509565 A ES 509565A ES 509565 A ES509565 A ES 509565A ES 509565 A0 ES509565 A0 ES 509565A0
Authority
ES
Spain
Prior art keywords
modulators
exchange
procedure
frequency band
signal 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.)
Granted
Application number
ES509565A
Other languages
Spanish (es)
Other versions
ES8302387A1 (en
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs 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 Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of ES8302387A1 publication Critical patent/ES8302387A1/en
Publication of ES509565A0 publication Critical patent/ES509565A0/en
Granted 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)
  • 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)
ES509565A 1981-02-13 1982-02-12 PROCEDURE FOR THE EXCHANGE OF PARTIAL BANDS, OF THE SAME WIDTH, OF A SIGNAL FREQUENCY BAND, THROUGH MODULATORS. Granted ES509565A0 (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
ES8302387A1 ES8302387A1 (en) 1982-12-16
ES509565A0 true ES509565A0 (en) 1982-12-16

Family

ID=6124771

Family Applications (1)

Application Number Title Priority Date Filing Date
ES509565A Granted ES509565A0 (en) 1981-02-13 1982-02-12 PROCEDURE FOR THE EXCHANGE OF PARTIAL BANDS, OF THE SAME WIDTH, OF A SIGNAL FREQUENCY BAND, THROUGH MODULATORS.

Country Status (7)

Country Link
EP (1) EP0058318B1 (en)
CA (1) CA1186380A (en)
DE (2) DE3105214A1 (en)
DK (1) DK52682A (en)
ES (1) ES509565A0 (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
DK52682A (en) 1982-08-14
EP0058318B1 (en) 1984-08-08
PT74410A (en) 1982-03-01
ES8302387A1 (en) 1982-12-16
DE3105214A1 (en) 1982-09-09
FI820393L (en) 1982-08-14
EP0058318A1 (en) 1982-08-25
PT74410B (en) 1983-10-28
CA1186380A (en) 1985-04-30
DE3260506D1 (en) 1984-09-13

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