发明名称 |
TARGET LEVEL SETTING METHOD FOR A SIGNAL USED IN MAXIMUM-LIKELIHOOD DECODING IN PRML PROCESSING OF A SIGNAL REPRODUCED FROM AN OPTICAL INFORMATION RECORDING MEDIUM, PLAYBACK DEVICE FOR AN OPTICAL INFORMATION RECORDING MEDIUM, AND TARGET LEVEL SETTING |
摘要 |
<p>Target levels for the PRML method are set adaptively, under conditions of simplicity and low cost. The target level setting method for playback from an optical information recording medium comprises: a step which reproduces a signal from light reflected from an optical information recording medium illuminated with laser light; a step for subjecting the reproduced signal to waveform equalization in accordance with prescribed partial response characteristics, and generating a waveform-equalized reproduced signal; a step for detecting the peak level of each of a plurality of prescribed codes, i.e. marks and spaces, from the waveform-equalized reproduced signal without regard to the code conditions adjacent to the codes; and a setting step which, based on the relative relationships between the detected peak levels, determines and sets a plurality of target levels which are used in Viterbi decoding and are arranged with unequal spacing.</p> |
申请公布号 |
WO2009107860(A1) |
申请公布日期 |
2009.09.03 |
申请号 |
WO2009JP54109 |
申请日期 |
2009.02.26 |
申请人 |
TAIYO YUDEN CO., LTD.;KAKIMOTO, HIROYA |
发明人 |
KAKIMOTO, HIROYA |
分类号 |
G11B20/18;G11B7/005;G11B20/14 |
主分类号 |
G11B20/18 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|