Signal processing for high-density digital magnetic recording

Proceedings. VLSI and Computer Peripherals. COMPEURO 89 Pub Date : 1989-05-08 DOI:10.1109/CMPEUR.1989.93353

F. Dolivo

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引用次数: 30

Abstract

The signal-processing techniques most often used in digital magnetic recording systems are run-length limited (RLL) coding and peak detection (PD). The application of more advanced methods, such as partial-response (PR) signaling and maximum-likelihood sequence detection (MLSD), allows a further increase in the recording densities and reliability presently achieved. After reviewing RLL coding an PD schemes, recording systems using PR signaling and MLSD (PRML) are described. Viterbi decoding and decision-directed algorithms for automatic gain control and timing recovery are discussed for the two types of PR scheme best suited for magnetic recording, class-IV (PR-IV) and extended class-IV (EPR-IV). Results of a performance study on PD and PRML systems which demonstrate the superiority of the PRML approach are presented. For the two PRML systems considered, sensitivity to various parameters and performance in an off-track situation were investigated. The results shown indicate that the two schemes are equally robust and that PR-IV signaling is superior to EPR-IV in off-track situations. A PRML system based on PR-IV signaling is also simpler to realize.<>

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高密度数字磁记录的信号处理

数字磁记录系统中最常用的信号处理技术是限行码(RLL)编码和峰值检测(PD)。应用更先进的方法，如部分响应(PR)信号和最大似然序列检测(MLSD)，可以进一步提高目前实现的记录密度和可靠性。在回顾了RLL编码和PD方案后，描述了使用PR信令和MLSD (PRML)的记录系统。讨论了两种最适合磁记录的PR方案，即iv类(PR- iv)和扩展iv类(EPR-IV)，用于自动增益控制和定时恢复的Viterbi解码和决策导向算法。对PD和PRML系统的性能研究结果证明了PRML方法的优越性。针对所考虑的两种PRML系统，研究了其对各种参数的敏感性和在偏离轨道情况下的性能。结果表明，两种方案具有相同的鲁棒性，PR-IV信号在偏离轨道情况下优于EPR-IV信号。基于PR-IV信令的PRML系统也更容易实现。

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Proceedings. VLSI and Computer Peripherals. COMPEURO 89

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