A new modulation code and new signal reproduction processes for a high-density optical disk system are proposed. With these new techniques, the capacity of the optical disk system can be 30% higher than the present digital versatile disk (DVD) system. An evaluation in terms of the bit error rate by both simulation and hardware experiments is also shown.

A new physical format using groove recording and new signal processing techniques is discussed. The signal reproduction of shallow pre-embossed pits was confirmed with a technique utilizing tangential push-pull (TPP) and a compatible partial response (PR) equalizing system. An evaluation in terms of the bit error rate by hardware experiments is demonstrated.

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