发明名称 |
Scrambling system of television signal |
摘要 |
A scrambling system of television signal includes a circuit for eliminating vertical sync pulses in a vertical sync pulse period and equivalent pulses in first and second equivalent pulse periods at opposite ends of said vertical sync pulse period. In place of the eliminated pulses, substitute pulses having a frequency equal to an integer times the frequency of horizontal sync pulses are deposited. A framing code inserting circuit is provided for inserting at least one framing code in the substituted pulses. The framing code is carrying information how the television signal is scrambled.
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申请公布号 |
US4618888(A) |
申请公布日期 |
1986.10.21 |
申请号 |
US19840581158 |
申请日期 |
1984.02.17 |
申请人 |
SANYO ELECTRIC CO., LTD. |
发明人 |
NOHARA, KAZUNORI;TANMATSU, KATSUO;HOSOYA, NOBUKAZU;HIGASHINO, TAKESHI |
分类号 |
H04N7/171;H04N7/167;(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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