Patent ID: 8144415
Filing Date: 2012-03-27
Classification: G11B

Abstract:
1. A magnetic recording/reproducing apparatus, comprising a perpendicular magnetic recording medium and a reproducing head, wherein a reproduced signal outputted from said reproducing head is processed through a partial response equalization circuit having a function of a noise-whitening matched filter, and having a frequency characteristic so that a low-frequency component of said reproduced signal including a direct current component is partially suppressed but not completely cut off through said partial response equalization circuit having said noise-whitening matched filter function, wherein said reproduced signal outputted from said partial response equalization circuit having said noise-whitening matched filter function is supplied to a maximum-likelihood decoder so as to be data-reproduced, wherein reproduced waveforms responding to a pair of the two closest recording transitions recorded on said recording medium at a shortest bit length interval are outputted as a waveform having intersymbol interference with intersymbol interference values A wherein said outputted waveforms are supplied to said maximum-likelihood decoder so as to be data-reproduced.