Read signal processing circuit, read signal processing...

Details Read signal processing circuit, read signal processing... Read signal processing circuit, read signal processing...

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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U.S. Appl. No. 11/704,964, filed Feb. 12, 2007, Atsushi Kikugawa, et al.

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