Patent ID: 6198587
Filing Date: 2001-03-06
Classification: G11B

Abstract:
A recording information reproducing apparatus for reproducing a digital signal from a recording medium on which the digital signal is recorded, comprising:reading means for reading recording information from said recording medium to obtain a read signal;recording density discriminating means for discriminating a recording density of said recording medium on the basis of said read signal;equalization coefficient setting means for generating an equalization coefficient based on the recording density discriminated;waveform equalizing means for compensating said read signal by increasing an amplitude of a high frequency component of said read signal by a gain based on the value of said equalization coefficient; anddecoding means for decoding said digital signal from the compensated read signal, wherein said recording density discriminating means extracts a predetermined high frequency signal and a predetermined low frequency signal from said read signal, respectively, and obtains a difference between amplitudes of both of said signals, thereby discriminating said recording density on the basis of said amplitude difference.