Patent ID: 7564756
Filing Date: 2009-07-21
Classification: G11B

Abstract:
1. A data storage medium reproducing device for reproducing data recorded on a data storage medium, comprising: signal detection means for reading out the data storage medium, and for detecting a reproduction signal, which is modulated in accordance with recorded data, the reproduction signal being modulated according to repeating of sub data having the same content and being added to the recorded data; data detection means for (i) generating a valid detection data, which is an obtained detection result of the recorded data, by using one or more specific parts in the reproduction signal, and (ii) allowing an accuracy of the detection data to become higher as a total time length of accumulation of a modulation amount(s) of the one or more specific parts in the reproduction signal used for generating the detection data becomes longer; and control means for controlling the total time length of the accumulation of the modulation amount(s) of the one or more parts of the reproduction signal used by the data detection means for generating said valid detection data; and further comprising: signal quality evaluation means for evaluating a signal quality of the reproduction signal, wherein: the control means controls the total time length of the accumulation of the modulation amount(s) of the one or more parts in the reproduction signal in accordance with an evaluation result obtained by the signal quality evaluation means.