发明名称 |
Time dispersal encryption of TV signals |
摘要 |
In encrypting a video signal for communications security, the horizontal synchronization pulses are removed, the active signal portions of each line in a field are delayed according to psuedorandom sequence of delays, and the reference color burst is moved to a position in the horizontal blanking interval which is constant for all lines irrespective of their individual delays. The process is reversed for decryption.
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申请公布号 |
US4901349(A) |
申请公布日期 |
1990.02.13 |
申请号 |
US19870140267 |
申请日期 |
1987.12.31 |
申请人 |
COMMUNICATIONS SATELLITE CORPORATION |
发明人 |
METZGER, SIDNEY;GARLOW, RONALD K. |
分类号 |
H04N7/167;H04N7/169;H04N7/171 |
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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