DK0390056T3 - Fremgangsmåde og apparat til dekodning af et fjernsynssignal - Google Patents

Fremgangsmåde og apparat til dekodning af et fjernsynssignal

Info

Publication number
DK0390056T3
DK0390056T3 DK90105770.3T DK90105770T DK0390056T3 DK 0390056 T3 DK0390056 T3 DK 0390056T3 DK 90105770 T DK90105770 T DK 90105770T DK 0390056 T3 DK0390056 T3 DK 0390056T3
Authority
DK
Denmark
Prior art keywords
decoding
television signal
television
signal
Prior art date
Application number
DK90105770.3T
Other languages
Danish (da)
English (en)
Inventor
Charles Michael White
Original Assignee
Gen Instrument Corp
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 Gen Instrument Corp filed Critical Gen Instrument Corp
Application granted granted Critical
Publication of DK0390056T3 publication Critical patent/DK0390056T3/da

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 Signal Processing For Recording (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Optical Communication System (AREA)
  • Details Of Television Scanning (AREA)
DK90105770.3T 1989-03-31 1990-03-27 Fremgangsmåde og apparat til dekodning af et fjernsynssignal DK0390056T3 (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/332,555 US4928309A (en) 1989-03-31 1989-03-31 Method and apparatus for descrambling a television signal

Publications (1)

Publication Number Publication Date
DK0390056T3 true DK0390056T3 (da) 1996-06-10

Family

ID=23298770

Family Applications (1)

Application Number Title Priority Date Filing Date
DK90105770.3T DK0390056T3 (da) 1989-03-31 1990-03-27 Fremgangsmåde og apparat til dekodning af et fjernsynssignal

Country Status (9)

Country Link
US (1) US4928309A (de)
EP (1) EP0390056B1 (de)
JP (1) JPH02301284A (de)
AU (1) AU616627B2 (de)
CA (1) CA2012549C (de)
DE (1) DE69025223T2 (de)
DK (1) DK0390056T3 (de)
HK (1) HK110497A (de)
NO (1) NO178170C (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2020313C (en) * 1989-07-21 1996-06-11 Ralph P. Harney Universal decoder
US5583936A (en) 1993-05-17 1996-12-10 Macrovision Corporation Video copy protection process enhancement to introduce horizontal and vertical picture distortions
TW420952B (en) * 1997-08-26 2001-02-01 Eagle Comtronics Inc Sync suppression television security system with addressable sync restoration
US6742182B1 (en) * 2000-01-24 2004-05-25 Webtv Networks, Inc. Descrambling a scrambled television signal using a cable box for authentication

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813482A (en) * 1972-07-24 1974-05-28 Blonder Tongue Lab Method of and apparatus for scramble-encoded transmission and decoded reception for over the air and cable subscription television and the like
US4095258A (en) * 1976-10-15 1978-06-13 Blonder-Tongue Laboratories, Inc. Apparatus for decoding scrambled television and similar transmissions
US4163252A (en) * 1976-11-03 1979-07-31 Blonder-Tongue Laboratories, Inc. Subscription television decoder apparatus
US4568974A (en) * 1982-10-28 1986-02-04 Oak Industries Inc. Video scrambling by the application of a variable periodic scrambling waveform
US4571615A (en) * 1983-06-10 1986-02-18 General Instrument Corporation Timing generator for sync suppressed television signals
US4542407A (en) * 1983-06-10 1985-09-17 North American Philips Corporation Method and apparatus for scrambling and descrambling television programs
JPS60263589A (ja) * 1984-06-11 1985-12-27 Alps Electric Co Ltd 有料テレビシステム
US4712237A (en) * 1984-10-29 1987-12-08 Zenith Electronics Corporation Method and apparatus for unscrambling sync-suppressed television signals
US4815129A (en) * 1985-01-02 1989-03-21 General Instrument Corp. Video encryption system
US4790011A (en) * 1986-10-17 1988-12-06 Zenith Electronics Corporation Auto clamp for modulator for suppressed sync signals
US4688097A (en) * 1986-10-30 1987-08-18 Jerrold Electronics Corp. D.C.-coupled video clamping circuit
JPS63193777A (ja) * 1987-02-06 1988-08-11 Japan Radio Co Ltd テレビジヨン映像変調器

Also Published As

Publication number Publication date
AU5062790A (en) 1990-10-04
NO178170C (no) 1996-01-31
NO901463L (no) 1990-10-01
EP0390056B1 (de) 1996-02-07
EP0390056A2 (de) 1990-10-03
DE69025223T2 (de) 1996-09-19
CA2012549A1 (en) 1990-09-30
DE69025223D1 (de) 1996-03-21
JPH02301284A (ja) 1990-12-13
HK110497A (en) 1997-08-22
EP0390056A3 (de) 1992-03-04
CA2012549C (en) 1995-06-13
AU616627B2 (en) 1991-10-31
US4928309A (en) 1990-05-22
NO178170B (no) 1995-10-23
NO901463D0 (no) 1990-03-30

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