公开(公告)号：JPH04266222A

公开(公告)日：1992-09-22

申请号：JP27055391

申请日：1991-09-24

Applicant: IBM

Inventor： ROBAATO TEI RINCHI JIYUNIA ,  DANIERU RUGAA ,  TOTSUDO CHIYAARUZU UEIGANDO

IPC: H03M7/14 ,  G11B20/14 ,  H03M5/14 ,  H03M7/46

Abstract: PURPOSE: To encode and decode a rate 2/5 (2, 18, 2) code which is especially suitable for the use in a resonance coil overwriting method related to magneto- optical recording. CONSTITUTION: Serial binary input data is converted into serial binary code data meeting (2, 18, 2) restrictions and is re-converted to serial binary input data by a decoder 16. An encoder 11 successively receives two input bits and a 5-bit state vector obtained from the just preceding encoding operation and generates a 5-bit code word and a new 5-bit state vector, based on these two input bits and 5-bit state vector. The decoder 16 converts binary code data into a 5-bit code word and successively converts each bit word code to a re- assigned 3-bit code word expression and collects a set of four adjacent 2-bit code word expressions. Each re-assigned code word expression is converted into a 2-bit output corresponding to the current set of four 3-bit code expressions, and continuous 2-bit outputs are re-converted to serial binary data.