Evaluation value calculating apparatus, recording and...

Details Evaluation value calculating apparatus, recording and... Evaluation value calculating apparatus, recording and...

2006-11-03

2010-11-16

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Including sampling or a/d converting

C360S031000, C714S746000, C714S794000, C714S796000

Reexamination Certificate

active

07835245

ABSTRACT:
An evaluation value calculating apparatus includes the following elements. A difference metric selecting unit selects a difference metric for a specific recorded sequence in recorded sequences obtained in a maximum likelihood decoding process when information expressed with marks and spaces on a recording medium is played back, the difference metric being obtained in the maximum likelihood decoding process. A difference metric error value calculating unit determines a difference metric error value for the selected difference metric using a calculation method that is selected according to an edge shift direction of each of the marks on a time axis, the difference metric error value representing an error from an ideal difference metric and the edge shift direction on the time axis. A statistical processing unit performs statistical processing on the determined difference metric error value on the basis of each of states of path meeting points to generate an evaluation value.

REFERENCES:
patent: 5938791 (1999-08-01), Narahara
patent: 6982942 (2006-01-01), Uchida et al.
patent: 7038869 (2006-05-01), Miyashita et al.
patent: 7257066 (2007-08-01), Fujiwara et al.
patent: 2003/0043939 (2003-03-01), Okumura et al.
patent: 2005-346897 (2005-12-01), None

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