Method of generating information used for the copy protecting signal and apparatus using the same
First Claim
1. A method of generating information for a copy protecting signal used in modifying a color video signal in order to protect copying a video program, said method comprising the steps of:
- (1) comparing information about color difference signal detected from said color video signal with a predetermined threshold level,(2) generating information for a copy protecting signal in response to a comparison result gained from Step (1),(3) adding said information for a copy protecting signal to said color video signal in a specified format.
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Abstract
A component of color difference signal is detected from a video component signal, and its color saturation information is compared with a predetermined threshold level, then in response to the comparison result, information is generated in order to control phase modulation such as, when the information is smaller than the threshold level, phases of color burst signals are modulated during a specified period, and when the information is larger than the threshold level, the phase stays as standard. The generated information is added to the color video signal. These steps can avoid unpleasant striped color noises appeared on a conventional color TV receiver, the unpleasant striped color noises has been caused by a modified color burst signal without the above steps.
20 Citations
12 Claims
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1. A method of generating information for a copy protecting signal used in modifying a color video signal in order to protect copying a video program, said method comprising the steps of:
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(1) comparing information about color difference signal detected from said color video signal with a predetermined threshold level, (2) generating information for a copy protecting signal in response to a comparison result gained from Step (1), (3) adding said information for a copy protecting signal to said color video signal in a specified format. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus of generating information for a copy protecting signal used in modifying a color video signal in order to protect copying a video program, said apparatus comprising:
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(1) a detecting circuit means for detecting information about color difference signal from an inputted color video signal, (2) a comparing circuit means for comparing color-difference-signal-information tapped from said color-difference-signal-information detecting circuit means fed to an input terminal with a predetermined threshold level fed to another input terminal, (3) a generating circuit means for generating specified information for a copy protecting signal in response to a comparison result of said color-difference-signal-information with said threshold level, said circuit means being connected to said comparing circuit means, and (4) an adding circuit means for adding said information for a copy protecting signal to said inputted color video signal in a specified format, said adding circuit means being connected to an output terminal of said generating circuit means. - View Dependent Claims (12)
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Specification