The performance of servo control system determines the reliability and stability of VTR (video Tape Recorder), and enables ultimately VTRs to record and replay video signal accurately.
伺服控制系统的优劣决定着录像机的可靠性及稳定性，是录像机得以正确记录和重放视频信号的根本保证。
These sources could be cameras, video replay apparatus such as video tape recorders or hard disk recorders, broadcast receivers or the like.
这些源可以是摄影机、诸如磁带录像机或硬盘记录器之类的视频回放设备、广播接收机等等。
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