发明名称 |
PROCESSING AN MPEG ELEMENTARY STREAM IN A CONDITIONAL ACCESS OVERLAY ENVIRONMENT |
摘要 |
Processing an MPEG elementary stream contained in multiple PID streams in a conditional access overlay environment. A multi-program transport stream contains numerous video and audio elementary streams. Critical packets in the elementary streams are encrypted with two different encryption schemes creating a stream having multiple PID values. The streams are then sent from the headend to individual set-top boxes. One encryption scheme can be decoded by the incumbent set-top box and the second encryption scheme can be decoded by the overlay set-top box. The overlay set-top box uses a dual filter system to filter and decode the PIDs for each video and audio stream of the desired program. |
申请公布号 |
CA2606395(C) |
申请公布日期 |
2012.01.17 |
申请号 |
CA20062606395 |
申请日期 |
2006.04.27 |
申请人 |
SCIENTIFIC-ATLANTA, INC. |
发明人 |
PINDER, HOWARD G.;HOPPER, JEFFREY C. |
分类号 |
H04N21/4405;H04N7/167 |
主分类号 |
H04N21/4405 |
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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