NO178170C - Basisbåndomformer samt fremgangsmåte for å deforvrenge et televisjonssignal - Google Patents

Basisbåndomformer samt fremgangsmåte for å deforvrenge et televisjonssignal

Info

Publication number
NO178170C
NO178170C NO901463A NO901463A NO178170C NO 178170 C NO178170 C NO 178170C NO 901463 A NO901463 A NO 901463A NO 901463 A NO901463 A NO 901463A NO 178170 C NO178170 C NO 178170C
Authority
NO
Norway
Prior art keywords
distorting
television signal
baseband converter
baseband
converter
Prior art date
Application number
NO901463A
Other languages
English (en)
Other versions
NO901463L (no
NO178170B (no
NO901463D0 (no
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
Publication of NO901463D0 publication Critical patent/NO901463D0/no
Publication of NO901463L publication Critical patent/NO901463L/no
Publication of NO178170B publication Critical patent/NO178170B/no
Publication of NO178170C publication Critical patent/NO178170C/no

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)
  • Details Of Television Scanning (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Optical Communication System (AREA)
NO901463A 1989-03-31 1990-03-30 Basisbåndomformer samt fremgangsmåte for å deforvrenge et televisjonssignal NO178170C (no)

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 (4)

Publication Number Publication Date
NO901463D0 NO901463D0 (no) 1990-03-30
NO901463L NO901463L (no) 1990-10-01
NO178170B NO178170B (no) 1995-10-23
NO178170C true NO178170C (no) 1996-01-31

Family

ID=23298770

Family Applications (1)

Application Number Title Priority Date Filing Date
NO901463A NO178170C (no) 1989-03-31 1990-03-30 Basisbåndomformer samt fremgangsmåte for å deforvrenge et televisjonssignal

Country Status (9)

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

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
DE69025223T2 (de) 1996-09-19
DK0390056T3 (da) 1996-06-10
EP0390056A2 (en) 1990-10-03
HK110497A (en) 1997-08-22
EP0390056A3 (en) 1992-03-04
DE69025223D1 (de) 1996-03-21
AU5062790A (en) 1990-10-04
EP0390056B1 (en) 1996-02-07
JPH02301284A (ja) 1990-12-13
NO901463L (no) 1990-10-01
AU616627B2 (en) 1991-10-31
CA2012549A1 (en) 1990-09-30
US4928309A (en) 1990-05-22
NO178170B (no) 1995-10-23
CA2012549C (en) 1995-06-13
NO901463D0 (no) 1990-03-30

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