TW366672B - Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal - Google Patents

Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal

Info

Publication number
TW366672B
TW366672B TW086102114A TW86102114A TW366672B TW 366672 B TW366672 B TW 366672B TW 086102114 A TW086102114 A TW 086102114A TW 86102114 A TW86102114 A TW 86102114A TW 366672 B TW366672 B TW 366672B
Authority
TW
Taiwan
Prior art keywords
digital
copy protection
pulses
signal
signals
Prior art date
Application number
TW086102114A
Other languages
Chinese (zh)
Inventor
Ronald Quan
Original Assignee
Macrovision 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 Macrovision Corp filed Critical Macrovision Corp
Application granted granted Critical
Publication of TW366672B publication Critical patent/TW366672B/en

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  • Television Signal Processing For Recording (AREA)

Abstract

Video signals in today's environment exist in both the analog domain and the digital domain. In many instances it may be desirable to delete or reduce the effectiveness of a video signal containing analog copy protection signals while the signals are in the digital domain. The invention uses digital techniques for defeating the effects of the analog copy protected signal while the signal is in the digital domain. The types of copy protection signals includes pseudo sync pulses and AGC pulses. Additionally digital techniques may be used for reducing or eliminating the affects of a chroma copy protection process. A digital video copy protection eliminator allows removal of substantially all pseudo sync pulses and/or AGC pulses in the digital domain. The location of pseudo syncs and/or AGC pulses are determined, while the signal is in the digital domain. These known pixel locations of all or some of the pseudo syncs and/or AGC pulses are used to digitally modify the signal so as to effectively remove the pseudo sync pulses and/or AGC pulses. Digital methods can also be applied to effectively eliminate or correct the chroma (burst phase modulation) protection process and or enhanced video copy protection signals in the digital domain.
TW086102114A 1996-10-17 1997-02-21 Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal TW366672B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73441296A 1996-10-17 1996-10-17

Publications (1)

Publication Number Publication Date
TW366672B true TW366672B (en) 1999-08-11

Family

ID=57941172

Family Applications (1)

Application Number Title Priority Date Filing Date
TW086102114A TW366672B (en) 1996-10-17 1997-02-21 Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal

Country Status (1)

Country Link
TW (1) TW366672B (en)

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