Title:
INFORMATION REPRODUCTION DEVICE AND INFORMATION REPRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2012/140997
Kind Code:
A1
Abstract:
Provided is a method to calculate, in an information reproduction device, the effective reliability of even an RLL modulated data string. The device comprises the following: a maximum likelihood path determination unit that outputs a maximum likelihood path, which leads to the most probable decoding results; a conflict path determination unit that outputs a conflict path for which the decoding results differ from those of the maximum likelihood path; a likelihood calculation unit that outputs a likelihood that is the difference between the maximum likelihood path and the conflict path; an inter-signal distance calculation unit that outputs an inter-signal distance which is the distance between a maximum likelihood waveform generated from maximum likelihood path decoding results and a conflict waveform generated from conflict path decoding results; and a reliability output unit that outputs reliability on the basis of a normalization likelihood in which the likelihood is normalized by the inter-signal distance.
Inventors:
NAKAMURA YUSUKE (JP)
ISHIHARA HAJIME (JP)
ISHIHARA HAJIME (JP)
Application Number:
PCT/JP2012/057552
Publication Date:
October 18, 2012
Filing Date:
March 23, 2012
Export Citation:
Assignee:
HITACHI CONSUMER ELECTRONICS (JP)
NAKAMURA YUSUKE (JP)
ISHIHARA HAJIME (JP)
NAKAMURA YUSUKE (JP)
ISHIHARA HAJIME (JP)
International Classes:
G11B20/18; G11B20/10; G11B20/14; H03M13/41
Foreign References:
| JPH11355151A | 1999-12-24 | |||
| JP2005166221A | 2005-06-23 | |||
| JP2006286073A | 2006-10-19 |
Attorney, Agent or Firm:
POLAIRE I. P. C. (JP)
Polaire Intellectual Property Corporation (JP)
Polaire Intellectual Property Corporation (JP)
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