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Track jump scheme using internal state manipulation in optical disc drives

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2 Author(s)
Jung Rae Ryoo ; Dept. of Control & Instrum. Eng., Seoul Nat. Univ. of Technol., Seoul, South Korea ; Tae-Yong Doh

Track jump control is a random access strategy applied to short distance movement less than 10 tracks. The most common track jump scheme is a bang-bang control of a kick and brake manner. In a conventional track jump scheme, a track-following controller is turned off during kick and brake periods, and restarted at a target track for track pull-in. The inevitable controller switching is accompanied by undesirable transient response due to non-zero initial condition, and overshoot in the transient response is a crucial factor regarding track pull-in stability. In this paper, a new track jump control scheme without controller switching is proposed for enhancing track jump stability. Instead of control switching, internal states of a track-following controller are artificially manipulated for kick and brake actions in a digital control environment. Experimental results are provided in comparison with conventional track jumps.

Published in:

Consumer Electronics, IEEE Transactions on  (Volume:55 ,  Issue: 2 )