发明名称 |
Conditional access television sound |
摘要 |
A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improper interception.
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申请公布号 |
US7146008(B1) |
申请公布日期 |
2006.12.05 |
申请号 |
US20000595804 |
申请日期 |
2000.06.16 |
申请人 |
INTEL CALIFORNIA |
发明人 |
HANNAH ERIC C.;CAHILL, III BENJAMIN M. |
分类号 |
H04N7/167;H04N9/45 |
主分类号 |
H04N7/167 |
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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