| 摘要 |
<p>Prevention of illegal copying of original video cassettes recording is ensured by making it impossible to produce an acceptable At the same time, the playback of the latter remains The chroma signal is modulated without interfering with the luminance signal and a compensating circuit restores the chroma signal for applying to the t.v. screen. At the same time, the additional errors in transmission during the making of the illicit copy from the original cassette cannot be compensated when playing back. The control of the video track is ensured by altering the phase of the burst signal' the vector of which forms the X-Y axes with the vectors of the colour difference signals.</p> |
