Patent ID: 6532337
Filing Date: 2003-03-11
Classification: G11B

Abstract:
A digital-signal playback apparatus comprising:a tentative discrimination means for carrying out tentative discrimination on an input signal at a predetermined sampling period according to an amplitude reference signal to output a binary signal with the same change-point timing as a correct result of said tentative discrimination or with change-point timing delayed by 1 clock period with respect to said correct result of said tentative discrimination; an equalization means for carrying out equalization on said input signal to output an equalized signal; and a judgment means for discriminating said input signal by designating a range of state transitions of said equalized signal and designating one of said state transitions within said range of state transitions as a most probable state transition based on said binary signal; wherein said range of state transitions of said equalized signal are limited to: a state transition of said equalized signal corresponding to a change point of said binary signal; and a state transition of said equalized signal corresponding to a change of said binary signal occurring with timing delayed by a change, point of said binary signal by 1 sampling period.