Methods and apparatus for providing cycles of normal and non normal phase in a color burst signal

An apparatus for providing a modified color burst signal in a video signal having video lines and pixels, comprising:

• a circuit for providing signals indicative of particular video lines and pixels in the video signal;
• and
• a modification circuit receiving the video signal and the video line and pixel signals, for providing the modified color burst signal in selected video lines, wherein the modified color burst signal within a video line contains cycles of normal color burst phase and cycles of non normal color burst phase, and wherein the cycles of normal and non normal color burst phase in the modified color burst signal provide a reduced copy protection effect on a television set or a VCR.

Method of providing a modified color burst signal in a video signal having video lines and pixels, comprising:

• providing signals indicative of particular video lines and pixels in the video signal;
• and
• providing the modified color burst signal in selected video lines in response to the line and pixel signals, wherein the modified color burst signal in a video line contains cycles of normal color burst phase and cycles of non normal color burst phase, and wherein the cycles of normal and non normal color burst phase in the modified color burst signal provide a reduced cony protection effect on a television set or a VCR.

Method of modifying a color burst signal in a video signal having television lines and pixels, comprising:

• receiving television lines with the color burst signals;
• and
• phase shifting part of the color burst signal in selected television lines to output a video signal with modified color burst signals, wherein the modified color burst signal in a television line has some cycles of normal color burst phase and some cycles that are phase shifted from the normal color burst phase, wherein the cycles of normal and phase shifted color burst phase in the modified color burst signal provide a reduced copy protection effect on a television set or a VCR.

Apparatus for providing a video signal with a modified color burst with reduced color stripe copy protection effect, comprising:

• a modification circuit receiving the video signal for providing in a video line selected phase modulation of less than an entire color burst envelope, wherein a modulated color burst envelope in a video line includes cycles of normal phase and cycles of modulated phase, and wherein the selected phase modulation of less than an entire color burst envelope provides less color stripe effect than would a phase modulation of the entire color burst envelope.