| 摘要 |
The method and the device can be used in TV engineering for obstructing unauthorized videorecording. By the method the phase of the colour signal is modified for time shorter than the time of every colour package. As a result the phase becomes different from the preset phase of the colour package. The device contains a subcarrier frequence (54), package gating unit (56), row selector (58) and copying protection unit (60). 29 cliams, 13 figures
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