The performance of servo control system determines the reliability and stability of VTR (videoTape Recorder), and enables ultimately VTRs to record and replayvideo 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。
2
These sources could be cameras, videoreplay apparatus such as videotape recorders or hard disk recorders, broadcast receivers or the like.