SE9100986D0 - TV SIGNAL TRANSFER PAY-TV SYSTEM - Google Patents

TV SIGNAL TRANSFER PAY-TV SYSTEM

Info

Publication number
SE9100986D0
SE9100986D0 SE9100986A SE9100986A SE9100986D0 SE 9100986 D0 SE9100986 D0 SE 9100986D0 SE 9100986 A SE9100986 A SE 9100986A SE 9100986 A SE9100986 A SE 9100986A SE 9100986 D0 SE9100986 D0 SE 9100986D0
Authority
SE
Sweden
Prior art keywords
signal
transmitter
receivers
signals according
subscribed
Prior art date
Application number
SE9100986A
Other languages
Swedish (sv)
Other versions
SE9100986A (en
SE466727B (en
Inventor
Persson Bjoern
Elektronik Ab Factum
Svensson Tomas
Original Assignee
Persson Bjoern
Elektronik Ab Factum
Svensson Tomas
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 Persson Bjoern, Elektronik Ab Factum, Svensson Tomas filed Critical Persson Bjoern
Priority to SE9100986A priority Critical patent/SE466727B/en
Publication of SE9100986D0 publication Critical patent/SE9100986D0/en
Priority to PCT/SE1992/000148 priority patent/WO1992017984A1/en
Priority to AU13477/92A priority patent/AU1347792A/en
Publication of SE466727B publication Critical patent/SE466727B/en
Publication of SE9100986A publication Critical patent/SE9100986A/xx

Links

Classifications

    • 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
    • H04N7/171—Systems operating in the amplitude domain of the television signal
    • H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Systems (AREA)

Abstract

The present invention relates to a TV-signal transmission pay-TV-system which includes a transmitter, a number of system-subscribed receivers (13), a number of non-subscribed receivers (16), and a signal transmission medium (6, 7, 8) which connects the transmitter with respective receivers, wherein the transmitter is provided with, or coacts with a signal scrambling device and respective system-subscribed receivers are provided with or preceded by a signal-unscrambling device (14), wherein the signal-scrambling device and the signal-unscrambling device (14) are mutually so adapted as to unscramble a scrambled TV-signal transmitted from the transmitter and thereby regenerate a signal in its correct form, so as to form picture-correct lines and pictures and possibly also sound, while non-system subscribed receivers (16) receive distorted lines, pictures and possibly also distorted sound from the scrambled TV-signal, and wherein line signals according to a first system (MAC) are transmitted via the signal transmission medium. The system includes a first means (44) which functions to inhibit a first selected part ("a") of the line signals according to a second system (PAL) and a second means (44) functions to enable a second selected part to be applied to the line signals according to the PAL-system with a signal structure that conforms to the first system, (MAC).
SE9100986A 1991-04-04 1991-04-04 TV SIGNAL TRANSFER PAY-TV SYSTEM SE466727B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9100986A SE466727B (en) 1991-04-04 1991-04-04 TV SIGNAL TRANSFER PAY-TV SYSTEM
PCT/SE1992/000148 WO1992017984A1 (en) 1991-04-04 1992-03-10 Tv-signal transmission pay-tv-system
AU13477/92A AU1347792A (en) 1991-04-04 1992-03-10 Tv-signal transmission pay-tv-system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9100986A SE466727B (en) 1991-04-04 1991-04-04 TV SIGNAL TRANSFER PAY-TV SYSTEM

Publications (3)

Publication Number Publication Date
SE9100986D0 true SE9100986D0 (en) 1991-04-04
SE466727B SE466727B (en) 1992-03-23
SE9100986A SE9100986A (en) 1992-03-30

Family

ID=20382350

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9100986A SE466727B (en) 1991-04-04 1991-04-04 TV SIGNAL TRANSFER PAY-TV SYSTEM

Country Status (3)

Country Link
AU (1) AU1347792A (en)
SE (1) SE466727B (en)
WO (1) WO1992017984A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541841A1 (en) * 1983-02-25 1984-08-31 Radiotechnique DEVICE FOR DE-RECORDING TELEVISION IMAGES BROUGHT BY APPLICATION TO VIDEO SIGNALS OF CIRCULAR PERMUTATIONS
US4642688A (en) * 1983-06-24 1987-02-10 Scientific Atlanta, Inc. Method and apparatus for creating encrypted and decrypted television signals

Also Published As

Publication number Publication date
SE9100986A (en) 1992-03-30
SE466727B (en) 1992-03-23
WO1992017984A1 (en) 1992-10-15
AU1347792A (en) 1992-11-02

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