Abstract
A high-speed and precise focusing/tracking servo system is indispensable for developing a HDTV optical disk camera-recorder. This system is needed for higher data transfer rate and recording density. In this work, we adopted a feedforward control employing the Zero Phase Error Tracking method for the focusing/tracking servo system, and this method reduced residual focusing/tracking errors compared with a feedback system. In addition, we confirmed that the method makes possible obtaining stable recordings and reproduces signals in optical disk systems with the high data transfer rate needed for broadcast use.
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