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SE9401290D0 - Encoding and decoding of a modulated radio frequency signal - Google Patents

Encoding and decoding of a modulated radio frequency signal

Info

Publication number
SE9401290D0
SE9401290D0 SE9401290A SE9401290A SE9401290D0 SE 9401290 D0 SE9401290 D0 SE 9401290D0 SE 9401290 A SE9401290 A SE 9401290A SE 9401290 A SE9401290 A SE 9401290A SE 9401290 D0 SE9401290 D0 SE 9401290D0
Authority
SE
Sweden
Prior art keywords
decoding
signal
frequency
radio frequency
encoding
Prior art date
Application number
SE9401290A
Other languages
Swedish (sv)
Other versions
SE517317C2 (en
SE9401290L (en
Inventor
Jens Joergen Johansson
Original Assignee
Jens Joergen Johansson
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
Priority claimed from SE9103098A external-priority patent/SE9103098D0/en
Application filed by Jens Joergen Johansson filed Critical Jens Joergen Johansson
Priority to SE9401290A priority Critical patent/SE517317C2/en
Publication of SE9401290L publication Critical patent/SE9401290L/en
Publication of SE9401290D0 publication Critical patent/SE9401290D0/en
Publication of SE517317C2 publication Critical patent/SE517317C2/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Television Systems (AREA)

Abstract

The signal is transmitted from a transmitting centre (10) to a number of receiver locations (11). Coding is effected by shifting the frequency of each frequency component in the transmitted signal, and decoding is effected by coordinately shifting the frequency of components in the received signal, at authorised locations. Both during coding and decoding, the frequency shifts are obtained by subjecting the signal to mixing with an unmodulated radio frequency signal, the frequency of which is shifted in accordance with a selected pattern, followed by a filtering stage. The original signal is thus retrieved following decoding.
SE9401290A 1991-10-24 1994-04-15 Method for coding and decoding modulated radio frequency signal SE517317C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9401290A SE517317C2 (en) 1991-10-24 1994-04-15 Method for coding and decoding modulated radio frequency signal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9103098A SE9103098D0 (en) 1991-10-24 1991-10-24 DEVICE ON TV SYSTEM
PCT/SE1992/000737 WO1993008662A1 (en) 1991-10-24 1992-10-23 Coding and decoding a modulated radio frequency signal
SE9401290A SE517317C2 (en) 1991-10-24 1994-04-15 Method for coding and decoding modulated radio frequency signal

Publications (3)

Publication Number Publication Date
SE9401290L SE9401290L (en) 1994-04-15
SE9401290D0 true SE9401290D0 (en) 1994-04-15
SE517317C2 SE517317C2 (en) 2002-05-28

Family

ID=26661220

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9401290A SE517317C2 (en) 1991-10-24 1994-04-15 Method for coding and decoding modulated radio frequency signal

Country Status (1)

Country Link
SE (1) SE517317C2 (en)

Also Published As

Publication number Publication date
SE517317C2 (en) 2002-05-28
SE9401290L (en) 1994-04-15

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Legal Events

Date Code Title Description
NUG Patent has lapsed