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多阶游程长度受限(ML-RLL)编码可以在保持原有记录符尺寸和记录单元数量的情况下将CD光盘存储容量提高2.4倍。借助标量衍射理论建立了多阶游程长度受限记录符的计算模型,对采用多阶游程长度受限编码的CD光盘的读出信号进行了仿真分析。结果表明,记录坑长度的变化对读出信号幅值影响较小,有利于将记录坑长度和记录坑的宽度两个参数进行分离检测,但在3T长度、不同宽度的记录坑相连的情况下,从读出信号中很难分辨出记录符的分界位置。
Multi-stage run length limited (ML-RLL) encoding can increase the CD-ROM storage capacity by 2.4 times while maintaining the original record size and number of recording units. Based on the scalar diffraction theory, a computational model of multi-order run length-limited records is established, and the readout signal of a CD-ROM with multi-order run-length encoding is simulated. The results show that the change of recording pit length has little influence on the readout signal amplitude, which is good for separating and detecting the length of recording pit and the width of recording pit. However, in the case of 3T length recording pit with different widths connected , It is difficult to distinguish the demarcation of the record from the readout signal.