发明名称 |
Video scrambling by the application of a variable periodic scrambling waveform |
摘要 |
A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture portion of a horizontal line uses the comparison between the brightness level of the video signal during a predetermined time period with a reference as a means for varying the amplitude of the periodic scrambling waveform.
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申请公布号 |
US4568974(A) |
申请公布日期 |
1986.02.04 |
申请号 |
US19820437349 |
申请日期 |
1982.10.28 |
申请人 |
OAK INDUSTRIES INC. |
发明人 |
DEN TOONDER, PIETER;BURKE, DENNIS E.;FORBES, RONALD L.;STOFFER, JAMES F. |
分类号 |
H04N7/171;(IPC1-7):H04N7/16;H04K1/02 |
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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