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
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.
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) |
-
1996
- 1996-05-01 MX MX9708327A patent/MX9708327A/en unknown
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