| 摘要 |
The invention relates to a system for backing-up the copy using a head switching pulse and a horizontal synchronisation signal in a video tape recorder.
<??>According to the invention, it comprises a positive-edge detection portion (1), a negative-edge detection portion (2), a counter portion (3), a blocking portion (5), a trigger pulse generating portion (4), a level detection portion (6), a detection pulse generating portion (7), a killer pulse generating portion (4) and a signal killer portion (9).
<??>The invention applies especially to software for video tape recorders.
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