Optical disc apparatus with adjustable constraint length PRML

Details Optical disc apparatus with adjustable constraint length PRML Optical disc apparatus with adjustable constraint length PRML

2005-03-30

2010-12-14

Nguyen, Hoa T (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Having specific code or form generation or regeneration...

Reexamination Certificate

active

07852729

ABSTRACT:
An optical disc apparatus implementing a PRML and capable of recording and reading a plurality of disc media with different recording densities, wherein read compatibility between drives is ensured without relying solely on the error correction capability of the ECC (error correction code). A phase comparator provided in a PLL compares each value of an input signal sequence with a designated threshold value in order to determine an edge. The optical disc apparatus can record and read a plurality of disc media with different recording densities while ensuring read compatibility.

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