发明名称 |
Method for the defeat of illegal descramblers sensitive to the edges of sync in scrambled video |
摘要 |
A method for defeating illegal receivers sensitive to the edges of synchronization signals in a scrambled video signal is provided. The scrambled video signal includes synchronization signals having levels which prevent a standard receiver from detecting the synchronization signals by using the levels of the synchronization signals. The synchronization signals also have one or more pulses with level transitions above or below a signal detection threshold level of the standard television receiver which prevent the illegal receivers from detecting the synchronization signals by using the edges of the synchronization signals.
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申请公布号 |
US6028941(A) |
申请公布日期 |
2000.02.22 |
申请号 |
US19970901531 |
申请日期 |
1997.07.28 |
申请人 |
SCIENTIFIC-ATLANTA, INC. |
发明人 |
KEMPLIN, STEVEN C. |
分类号 |
H04N7/171;(IPC1-7):H04N7/167 |
主分类号 |
H04N7/171 |
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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