| http://www.w3.org/ns/prov#value | - According to this invention, for achieving the foregoing object, provided in an optical disk is an area in which a signal having the center of an eye pattern deviated from the center of the amplitude of the eye pattern is recorded after a signal with a given pattern, and further added to a reproducing system are a function to change the threshold value in demodulating an RF signal into a digital s
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