发明名称 |
Method of generating information used for the copy protecting signal and apparatus using the same |
摘要 |
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.
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申请公布号 |
US6018608(A) |
申请公布日期 |
2000.01.25 |
申请号 |
US19960761532 |
申请日期 |
1996.12.06 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
SAKASHITA, HIROHIKO;MORITA, HISAO;FUJITA, MASAAKI;ISHIKAWA, KENJI |
分类号 |
H04N5/913;(IPC1-7):H04N5/76 |
主分类号 |
H04N5/913 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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