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目前,在基层电教机构和学校中,添置了一批VHS录像设备,对于一些录像资料常常需要进行剪辑,而目前在教育系统中,VHS编辑设备甚少,无法进行精度较高的电子编辑。但是,对于一些教学资料的编辑,精度要求不是很高,用现有的设备进行组合编辑还是可行的。无编辑功能的家用录像机磁头分布如图1所示,当录像机开始记录时,后面记录的磁迹与前一段记录的磁迹在磁带上的位置是随机的,很难符合磁迹格式的要求,而且连接处的控制信号也不连续,以至于在重放时编辑点图面错乱,不能正常观看。这是因为,从全消磁头A点到视频磁头入带处B点有一段距离S,当视频磁头、全消磁头、控制磁头的信号都是同时输入或切断时,就会导致在编辑入
At present, a batch of VHS video recording equipment is added to primary audio-visual institutions and schools. Video clips often need to be edited for some video recording materials. Currently, the VHS editing equipment is scarce in the education system and the electronic editing with high accuracy can not be performed. However, for some teaching materials editing, the accuracy requirements are not very high, combined editing with existing equipment is feasible. As shown in Fig. 1, when the video recorder starts recording, the positions of the tracks recorded in the previous and the tracks recorded in the previous stage are random on the tape and are difficult to meet the requirements of the track format. As shown in Fig. 1, And the control signal is not continuous at the junction, so that editing point in the playback screen confusion, you can not normally watch. This is because, from the total degaussing head point A to the video head into the band at point B there is a distance S, when the video head, full degaussing head, the control head signal is input or cut off at the same time,