Patent ID: 6339581
Filing Date: 2002-01-15
Classification: G11B

Abstract:
A disc player comprising:reading means for obtaining a read signal by reading recording information from a recording disc; and a prepit detecting circuit for detecting prepits which have previously been formed on said recording disc on the basis of said read signal and generating a prepit detection signal, wherein said reading means includes first and second reading elements arranged in two regions divided along the direction of recording tracks of said recording disc, and said prepit detecting circuit is constructed by phase detecting means for detecting a phase difference between a first read signal read out by said first reading element and a second read signal read out by said second reading element, phase correcting means for obtaining a first phase correction read signal by correcting the phase of said first read signal by an amount corresponding to said phase difference, and a subtractor for generating a differential value between said first phase correction read signal and said second read signal as said prepit detection signal.