Patent ID: 8004443
Filing Date: 2011-08-23
Classification: G11B

Abstract:
1. An information readout apparatus comprising: an analog to digital converting section configured to convert a read signal read out from an optical disc medium into a digital signal, and outputting the digital signal in synchronous with a first clock signal with a frequency which is N/M times of a channel frequency contained in said read signal, wherein data is recorded on said optical disc medium with run length limited code when the shortest run length is 1, and N is an integer equal to or more than 2 and M is an integer meeting N/M>0.5; an equalizing section configured to equalize said digital signal to a previously specified partial response (PR) characteristic in synchronous with said first clock signal signal; an interpolating section configured to convert N input data outputted from said equalizing means into M output data, and outputting the output data in synchronous with a second clock signal with a frequency of 1/M times of said channel frequency; a maximum likelihood detecting section configured to convert the output data outputted from said interpolation means into an M-bit detection data, and outputting said detection data in synchronous with said second clock signal signal; and a PLL section configured to generate said first clock signal and said second clock signal based on said read signal.