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

Links

Landscapes

  • 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)

Similar Documents

Publication Publication Date Title
CA2234972A1 (en) Digitally removing video copy protection pulses
EP0858219A3 (en) Method and apparatus for disabling anti-copy protection system in video signals
AU6086696A (en) Apparatus and method for encoding and decoding digital video data operable to remove noise from subtitle data included therewith
NZ336915A (en) Method and apparatus for modifying the envelope of an rf carrier signal to remove copy protection signals therefrom
MX9700577A (en) Apparatus and method for comprehensive copy protection for video platforms and unprotected source material.
HK1045043B (en) Method and apparatus for reducing the effects of a video copy protection process
EP0763936A3 (en) Illegal view/copy protection method and apparatus for digital broadcasting system
EP0677949A3 (en) Method for controlling copyright of encrypted digital data.
TW377088U (en) Apparatus for preventing unauthorized copying of video signals
WO2002015557A3 (en) Method and apparatus for enhancing chroma distortion in a video copy protection signal
PL316700A1 (en) Method of and apparatus for protecting against unauthorised copying by phase-shifting of colour synchronisation signal portion in an analogue colour video signal
HUP9602710A2 (en) Method and apparatus for encoding pixel colour values of digital video images, as well as video signal, record carrier for it and apparatus displaying the video signal
GB2273843B (en) Apparatus and method for enhancing transient edge of video signal
GB9111926D0 (en) An improved method of video noise reduction using non-linear pre/de-emphasis
TW366672B (en) Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal
DE69723390D1 (en) Method and device for video signal processing and storage medium
EP0778702A3 (en) Method of generating information used for the copy protecting signal and apparatus using the same
GB9318778D0 (en) A method of and apparatus for deriving a key signal from a digital video signal
MY115526A (en) Clock signal generating apparatus and clock signal generating method
EP0390056A3 (en) Method and apparatus for descrambling a television signal
ATE462274T1 (en) METHOD AND APPARATUS FOR MODIFYING A VIDEO SIGNAL TO PREVENT THE PRODUCTION OF ACCEPTABLE VIDEO TAPES
NZ332756A (en) Method and apparatus for minimizing chroma subcarrier instability caused by a video line scrambling system
GB2370444A (en) Graphics subsystem bypass method and apparatus
AU6426299A (en) Apparatus and method for preventing unauthorized circumvention of television program blocking function
IL125263A0 (en) Method and apparatus for improving the effects of color burst modifications to a video signal

Legal Events

Date Code Title Description
MK4A Expiration of patent term of an invention patent