[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

ES8302387A1 - Sub-band permutation method. - Google Patents

Sub-band permutation method.

Info

Publication number
ES8302387A1
ES8302387A1 ES509565A ES509565A ES8302387A1 ES 8302387 A1 ES8302387 A1 ES 8302387A1 ES 509565 A ES509565 A ES 509565A ES 509565 A ES509565 A ES 509565A ES 8302387 A1 ES8302387 A1 ES 8302387A1
Authority
ES
Spain
Prior art keywords
modulators
nnu
epsilon
partial bands
fnu
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
Application number
ES509565A
Other languages
Spanish (es)
Other versions
ES509565A0 (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 ES509565A0 publication Critical patent/ES509565A0/en
Publication of ES8302387A1 publication Critical patent/ES8302387A1/en
Expired 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)

Abstract

1. Method for the interchanging of equally wide partial bands of a signal frequency band by means of modulators (X), behind which are connected like band pass filters (BP 1 to BP 5) as well as further modulators (X), wherein certain carrier frequencies (f 1 to f 4) are fixedly associated with the modulators (X) and a coupling matrix (scrambling matrix), which is controllable by a random generator, for the scrambling of the partial bands is provided between the band pass filters (BP 1 to BP 5) and the modulators (X) connected therebehind, characterised thereby, that the carrier frequencies display the values fnu = (nnu - i/l) . B with nu = 1, 2 ... partial bands of the bandwith B and i, l and nnu epsilon | N = 1, 2 ... (elements epsilon from the mass of natural numbers) as freely selectable parameters, wherein i and nnu can also assume the value 0, and that the modulators (X) operate discretely in time and the relationship fS = 2m nu . fnu , mnu epsilon | N = 1, 2 ... applies for the scanning frequency of the carrier oscillations.
ES509565A 1981-02-13 1982-02-12 Sub-band permutation method. Expired ES8302387A1 (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
ES509565A0 ES509565A0 (en) 1982-12-16
ES8302387A1 true ES8302387A1 (en) 1982-12-16

Family

ID=6124771

Family Applications (1)

Application Number Title Priority Date Filing Date
ES509565A Expired ES8302387A1 (en) 1981-02-13 1982-02-12 Sub-band permutation method.

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
PT74410B (en) 1983-10-28
DK52682A (en) 1982-08-14
DE3260506D1 (en) 1984-09-13
FI820393L (en) 1982-08-14

Similar Documents

Publication Publication Date Title
CA1021452A (en) Method and apparatus for scrambling and unscrambling communication signals
EP0304890A3 (en) Earth station capable of effectively using a frequency band of a satellite
CA2104215A1 (en) Radio receiver for forming a baseband signal of time-varying frequencies
GB2105948B (en) Method and apparatus for low frequency active attenuation
EP0843411A3 (en) System and method for shifting a frequency
US2817711A (en) Band compression system
EP0567008A3 (en) Process to grow several single crystal and apparatus therefor.
CA955489A (en) Method and apparatus for producing cigarette filter sleeves
GB2047053B (en) Method of generating psk and qam transmission signals
US4188506A (en) Method and installation for masked speech transmission over a telephone channel
ES8302387A1 (en) Sub-band permutation method.
GB563471A (en) Apparatus for scrambling signals
GB635707A (en) Method of and arrangement for scrambling signals in multichannel systems
AU2672592A (en) Process for reducing frequency interlacing during acoustic or optical signal transmission and/or recording
CA996668A (en) Radio frequency interference prevention apparatus and method
JPS6424648A (en) Privacy call equipment
ES8303853A1 (en) Method of transforming speech signals subdivided into signal segments for enciphered transmission, and apparatus for realizing this method.
TW363323B (en) Method of data transmission and clocked data transmission device
JPS5223241A (en) Frequency compensation system
IE41265B1 (en) Improvements in or relating to the camouflaged transmission of signals
JPS5612146A (en) Carrier communication system
JPS5666943A (en) Privacy communication system
GB1166632A (en) Improved Wired Broadcasting Systems and Apparatus Therefor
JPS534445A (en) Ceramic filter circuit
JPS6489653A (en) Communication system