The performance of servo control system determines the reliability and stability of VTR (videoTapeRecorder), 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。
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VideotapeRecorder (VTR) is a sort of video recording equipment using magnetic tape.