Method and apparatus having cascaded decoding for multiple runlength-limited channel codes
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Aug 19, 1998
filing date -
Aug 19, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Two different (d,k)-RLL codes can be used in systems such as erasable and writable dense optical disks. This is because it is typically possible to make readers capable of reading information written at a higher resolution (by a short wavelength authoring system) than the resolution that can be written by a consumer writer (using a laser of the same or longer wavelength as the reader). For one embodiment, two different decoders are used to decode the data. Alternately, we present an encoding scheme which operates with a single decoder. In one case, q.sub.1 =q.sub.2 (and as a result p.sub.1
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