发明名称 |
Broadband television scrambling and descrambling system |
摘要 |
A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary subset of channels in a channel group. The system provides for a closed loop injection signal phasor control so as to maintain substantially constant relationship between the television signals and the injected signals. The combined signals are supplied to subscribers enabling the use of their cable ready equipment.
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申请公布号 |
US5864621(A) |
申请公布日期 |
1999.01.26 |
申请号 |
US19960662504 |
申请日期 |
1996.06.12 |
申请人 |
MULTICHANNEL COMMUNICATION SCIENCES, INC. |
发明人 |
KATZNELSON, RON D. |
分类号 |
H04N7/167;H04N7/169;(IPC1-7):H04N7/167 |
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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