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1 引言上世纪60年代末和70年代初以来,光记录技术被广泛应用于CD,CD-ROM,CD-R,DVD,Blue-ray Disk 等许多光存储产品中。Immink和Ogawa发明的8-14EFM 调制编码作为CD的一种记录编码一直沿用至今。CD推出约15年后,DVD开始进入市场。DVD采用的是EFM+ 编码,该编码与EFM编码具有相同的参数但拥有更高 (提高约6％)的码率。这两种编码均属于游程长度受限 RLL(Run-Length-Limited)编码,以下简称游程受限编码。游程受限编码在大容量存储系统CD,DAT和DVD 中得到了广泛的应用。表1给出了当前消费类电子产品中几种常见的记录(信道)编码及其应用情况。
1 Introduction Since the late 1960s and early 1970s, optical recording technology has been widely used in many optical storage products such as CDs, CD-ROMs, CD-Rs, DVDs and Blu-ray Discs. The 8-14 EFM modulation coding invented by Immink and Ogawa has been used as a recording code for CDs until now. About 15 years after the launch of the CD, the DVD started to enter the market. The DVD uses EFM + encoding, which has the same parameters as the EFM encoding but a higher (about 6% increase) code rate. Both of these codes are run-length-limited (RLL) codes, hereinafter referred to as run-length limited codes. Run-limit encoding is widely used on mass storage systems such as CDs, DATs and DVDs. Table 1 shows several common record (channel) codes and their applications in current consumer electronic products.