Optical information reproduction device and signal processing circuit used therein
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United States of America Patent
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-
Nov 20, 2001
Grant Date -
N/A
app pub date -
Jan 29, 1999
filing date -
Feb 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an optical information reproduction device for reproducing information from an optical disk medium on which an identification information area including first identification information shifted radially outward with respect to the center of a recording track by a specified distance and second identification information shifted radially inward with respect to the center of a recording track by a specified distance, and a user information area disposed along the center of a recording track are disposed, information is reproduced using a sum signal and a difference signal of the outputs from a split photodetector having at least two light-receiving parts disposed on opposite sides of a track tangential line. The first or second identification information signal is inverted and the direct-current component in the identification information signal and the user information signal are removed.
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