Coded data generation or conversion – Analog to or from digital conversion – Converter is part of control loop
Reexamination Certificate
2007-07-26
2008-11-04
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Converter is part of control loop
C341S118000, C341S139000, C360S046000, C360S051000, C369S059190, C369S059210, C375S341000, C375S376000
Reexamination Certificate
active
07446685
ABSTRACT:
The present invention provides a read channel and a drive capable of suppressing deterioration in performance of a PLL and a Viterbi decoder by using a DC component eliminating means capable of higher-speed operation than hitherto. The location of an edge is determined by using differential of a read signal, and a DC component is detected from the midpoint level of the edge. Detection of a pseudo-edge due to a long mark or space signal is prevented by limiting the absolute value of a maximum or minimum of a differential coefficient when the location of the edge is determined from the differential coefficient of the read signal. Internal operation of a DC component detector is controlled according to the state of the PLL and the magnitude of the DC component.
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Kikugawa Atsushi
Kurokawa Takahiro
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Hitachi-LG Data Storage, Inc.
Nguyen Khai M
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