发明名称 |
Wire-tap preventing apparatus for community antenna television terminals |
摘要 |
Uncompensated, illegal viewing of a restricted channel at a subscriber's terminal in a subscription CATV system is prevented by including a redundancy check-bit in each subscriber's terminal address, and by providing for a verification of the check-bit before viewing of the program on the channel is permitted.
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申请公布号 |
US4740835(A) |
申请公布日期 |
1988.04.26 |
申请号 |
US19860836865 |
申请日期 |
1986.03.07 |
申请人 |
PIONEER ELECTRONIC CORPORATION |
发明人 |
NISHIBORI, ISAO;NAGASAWA, KUNIHIKO |
分类号 |
H04N7/16;(IPC1-7):H04N7/10 |
主分类号 |
H04N7/16 |
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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