| 摘要 |
<p>A video recording and playback device has a control track recorder for recording a control track signal including timing edges recorded on a tape or other storage medium together with the video program. The timing edges have a minimum slope leading edge for operating timing circuits upon playback, the timing circuits being nonresponsive to trailing edges. A decoder is coupled to the control track signal and to the tape drive for switching among a forward play mode, a forward skip mode and a rewind mode, as a function of play, skip and rewind codes inserted into the control track as pulses with sloping leading edges less than the minimum, such that the pulses are distinct from the timing edges. The pulses digitally encode play, skip and rewind commands, and also can encode a number of repetitions for segments preceded by a play code and followed by a rewind code. The device permits user editing of play, skip and rewind codes and a number of multiple replays, by overwriting existing codes with codes selected by the user via a menu screen.</p> |
