PUNCTURED CONVOLUTIONAL CODED PR4ML SYSTEM IN DIGITAL MAGNETIC RECORDING

A punctured convolutional coded PR4ML system for digital magnetic reco rding is proposed. In this system, convolutional coding is used for re cording and two-track coded recording is carried out after using the p unctured method. In this study, the error rate performance was simulat ed by a computer to compare this system with the conventional I-NRZI c oded PR4ML system. Our system was found to have superior characteristi cs in high-density recording, and an error rate of 10(-4) could be ach ieved for a normalized linear density of K = 3, even when the SN ratio was about 3.8 dB lower at the reading point than in the conventional system. (C) 1998 Scripta Technica, Electron Comm Jpn Pt 2, 81(9): 62-7 0, 1998.