MX9708327A - Method and apparatus for defeating effects of color burst modifications to a video signal. - Google Patents

Method and apparatus for defeating effects of color burst modifications to a video signal.

Info

Publication number
MX9708327A
MX9708327A MX9708327A MX9708327A MX9708327A MX 9708327 A MX9708327 A MX 9708327A MX 9708327 A MX9708327 A MX 9708327A MX 9708327 A MX9708327 A MX 9708327A MX 9708327 A MX9708327 A MX 9708327A
Authority
MX
Mexico
Prior art keywords
color
bursts
modified
color stripe
video
Prior art date
Application number
MX9708327A
Other languages
Spanish (es)
Other versions
MXPA97008327A (en
Inventor
Ronald Quan
John O Ryan
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
Priority claimed from PCT/US1996/006138 external-priority patent/WO1996036174A2/en
Publication of MXPA97008327A publication Critical patent/MXPA97008327A/en
Publication of MX9708327A publication Critical patent/MX9708327A/en

Links

Abstract

In the known color stripe process for preventing recording of video signals, the color burst present on each line of active video is modified so that any subsequent video tape recording of the video signal shows variations in the color fidelity that appear as undesirable bands or stripes of color error. This color stripe process is defeated first by determining the location of the video lines including the color stripe process, either by prior experimentation or by on-line detection. Then some or all of the lines including the modified color bursts are modified so as to render the overall video signal recordable. The modification is accomplished in a number of ways, including phase shifting the color stripe burst into the correct phase, replacing some of the color stripe bursts or a portion of particular color stripe bursts so that they are no longer effective, and mixing the color stripe burst with color stripe signals of the correct phase so as to eliminate most or all of the phase error present. The modified color bursts are defeated, in other versions, by modifying the horizontal sync pulse signals immediately preceding the modified color bursts so that the modified color bursts are not detected by a VCR and hence have no effect.
MX9708327A 1996-05-01 1996-05-01 Method and apparatus for defeating effects of color burst modifications to a video signal. MX9708327A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US438155 1995-05-09
US438,155 1995-05-09
PCT/US1996/006138 WO1996036174A2 (en) 1995-05-09 1996-05-01 Method and apparatus for defeating effects of color burst modifications to a video signal

Publications (2)

Publication Number Publication Date
MXPA97008327A MXPA97008327A (en) 1998-01-01
MX9708327A true MX9708327A (en) 1998-01-31

Family

ID=39165738

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9708327A MX9708327A (en) 1996-05-01 1996-05-01 Method and apparatus for defeating effects of color burst modifications to a video signal.

Country Status (1)

Country Link
MX (1) MX9708327A (en)

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