Method and apparatus for attenuating or eliminating at least a portion of color burst modifications to a video signal

A method of modifying copy protection effects in a video signal, wherein the video signal includes television lines, horizontal blanking intervals, horizontal sync pulses, color burst intervals, and wherein the video signal also may include one or more of the following;

• AGC pulses, pseudo sync pulses, raised back porch pulses, color stripe signals, comprising:
• coupling via a circuit the video signal to a modification circuit, and to a burst phase detector circuit that senses a non normal color burst interval;
• and
• modifying via a circuit the video signal upon sensing cycles of non normal phase in selected color burst intervals;
• wherein the modifying includes phase changes in the color burst intervals in at least one but not all cycles of non normal phase wherein the modified color bursts contain cycles of correct and incorrect color phase, whereby the effect of the copy protection video signal is attenuated or eliminated on a VCR or television set.

Apparatus for modifying copy protection effects in a video signal, wherein the video signal includes television lines, horizontal blanking intervals, horizontal sync pulses, color burst intervals, and wherein the video signal may also include one or more of the following;

• AGC pulses, pseudo sync pulses, raised back porch pulses, color stripe signals, comprising:
• a modification circuit receiving the video signal;
• a burst phase detector circuit for sensing non normal color burst intervals;
• wherein the modification circuit selectively modifies the phase of selected non normal color burst intervals upon the burst phase detector circuit sensing non normal phase in the selected non normal color burst intervals;
• and
• wherein the modification includes the phase changes in the non normal color burst intervals in at least one but not all cycles of non normal phase wherein the modified color bursts contain cycles of correct and incorrect color phase, whereby the effect of the copy protection video signal is attenuated or eliminated on a VCR or television set.