光学学报, 2010, 30 (4): 1130, 网络出版: 2010-04-20
波形调制多阶光盘的自适应阶次检测
Adaptive Level Detection for Multi-Level Optical Disk Using Signal Waveform Modulation
摘要
波形调制多阶的时钟恢复后的读出信号跟符号序列没有对应关系,部分响应最大似然(PRML)检测不能直接使用。提出了一种基于最小欧氏距离的自适应阶次检测方法,该方法用实际波形与标准波形的欧氏距离作为阶次检测的依据。自适应调整能让设定的标准波形值向实际波形接近。保护机制能防止设定的标准波形严重偏离真实值。实验结果表明,在不调整参数的情况下,该检测方法能对不同批次盘片获得相当的阶次错误率2×10-4以下。该方法对缺陷盘片也有很好的适应性。使用该检测方法的播放系统实现了高清视频的连续稳定播放。
Abstract
The partial response maximum like-hood (PRML) can not be directly used for the signal waveform modulation (SWM) multi-level (ML) recording,because in SWM ML,the signal after time recovery does not respond to a symbol sequence. An adaptive level detection method based on minimum Euclid distance is proposed. The Euclid distance between the actual waveform and reference waveform is employed for the level detection. Adaptation can make the set reference waveform approach the actual waveform. The protection mechanism can prevent the case that the reference waveform greatly deviates from the actual. Experimental results show that,without adjusting parameters,this detection method can achieve a low level error ratio,which is less than 2×10-4,for different disk batches. It also has capability for disks with defects. Using this level detection method,the playback system realizes stable and continuous playback of high definition video.
唐毅, 裴京, 潘龙法, 刘海龙. 波形调制多阶光盘的自适应阶次检测[J]. 光学学报, 2010, 30(4): 1130. Tang Yi, Pei Jing, Pan Longfa, Liu Hailong. Adaptive Level Detection for Multi-Level Optical Disk Using Signal Waveform Modulation[J]. Acta Optica Sinica, 2010, 30(4): 1130.