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家用录象机由于具备了静止重放、慢速重放、倍速重放以及高速搜索等特殊重放功能,不但给使用者增添了乐趣,而且在某些场合还带来了不少方便.就VHS录象机来说,它采用的是磁迹间无保护带的高密度记录方式和具有方位角的视频磁头,在特殊重放过程中,当磁头越过相邻磁迹时会产生噪声带等各种问题,因此它所采用的特殊重放方法也与其它录象机不同.下面通过对磁迹与磁头包络的分析,介绍VHS录象机无噪声带的特殊重放功能和原理.
Home video recorders with special playback features such as still playback, slow playback, double-speed playback and high-speed search, not only to add fun to the user, and in some occasions also brought a lot of convenience. VHS video recorders use high-density recording with no guard band between tracks and video heads with azimuth, which produce noise bands when over the adjacent tracks during special playback Therefore, the special replay method it uses is also different from other video recorders.The following introduces the special replay function and principle of noiseless audio tapes of VHS video recorders through the analysis of tracks and head envelopes.