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High Rate (0,4) CODE for Peak-Detect Channel

IP.com Disclosure Number: IPCOM000034298D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Patel, AM [+details]

Abstract

A 16/17 rate (0,4) code that has design constraints suitable for the peak-detect channel in magnetic tape products is described. This code maps goups of 16 data bits into 17-bit code words and provides an effective increase in recording density. Code parameters m/n (d,k) represent the code rate and constraints on the run length of zeros in a coded binary sequence. The code rate is m/n where groups of m data bits are mapped into n-bit code words (n>m). Parameters d and k represent the minimum and maximum run length of zeros appearing anywhere in the coded sequence. Run length parameters are (0,4); but this has no significant effect on the self- clocking property, since there are more than adequate clocking transitions in the code.