Patent ID: 7561642
Filing Date: 2009-07-14
Classification: G11B

Abstract:
1. A recording condition setting device for setting a recording condition that is constituted of a plurality of elements corresponding to each of plural items of recording information and is used to form a recording mark on a storage medium, said recording condition setting device comprising: Viterbi decoding means for generating one or more path metric differences while decoding one or more bit sequences by Viterbi decoding from a reproduction signal from the storage medium so as to generate one or more decoded bit sequences; specific pattern detection means for detecting, as a specific pattern, one or more patterns having been set with respect to each of the plural items of recording information, from the decoded bit sequences generated by the Viterbi decoding means; path metric difference classification means which includes (i) specific path metric difference extraction means for extracting one or more specific path metric differences corresponding to the specific patterns detected by the specific pattern detection means, from the path metric differences generated by the Viterbi decoding means and (ii) by-recording-information pattern detection means for detecting one or more by-recording-information patterns having corresponding recording information out of the plural items of recording information from the decoded bit sequences including the specific patterns detected by the specific pattern detection means, said path metric difference classification means classifying the specific path metric differences extracted by the specific path metric difference extraction means into one or more by-recording-information path metric differences corresponding to the by-recording-information patterns detected by the by-recording-information pattern detection means; and recording condition setting means for setting the recording condition based on the by-recording-information path metric differences classified by the path metric difference classification means.