PENINGKATAN PROSES PERLINDUNGAN PENGGANDAAN VIDEO DENGAN MEMASUKKAN PERUBAHAN BENTUK GAMBAR HORISONTAL DAN VERTIKAL (PECAHAN DARI P-940762)

摘要

The method involves blanking a portion of a video signal at a location in the over-scan portion of the video signal prior to a synchronisation signal. A waveform for indicating a video retrace prior to occurrence of the synchronisation signal is added to the blanked location. The adding step involves adding the waveform only to portions of the video signal having active video prior to the blanking step.