Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2011-08-23
2011-08-23
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S059000, C369S059220
Reexamination Certificate
active
08004443
ABSTRACT:
An information readout apparatus includes analog to digital converting means, equalizing means, interpolating means, maximum likelihood detecting means and PLL means. The analog to digital converting means converts a read signal read out from an optical disc medium, on which data is recorded with run length limited code that the shortest run length is 1, into a digital signal, and outputs the digital signal in synchronous with a first clock signal with a frequency which is N/M times of a channel frequency. At this time, N is an integer equal to or more than 2 and M is an integer meeting N/M>0.5. The equalizing means equalizes said digital signal to a previously specified partial response (PR) characteristic in synchronous with said first clock signal signal. The interpolating means converts N input data outputted from said equalizing means into M output data, and outputs output data in synchronous with a second clock signal with a frequency of 1/M times of the channel frequency. The maximum likelihood detecting means converts the output data outputted from said interpolation means into an M-bit detection data, and outputs said detection data in synchronous with said second clock signal signal. The PLL means generates said first clock signal and said second clock signal based on said read signal.
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NEC Corporation
Nguyen Khai M
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