A Method for Constructing Jacoby-type Ternary Recording Codes with DC-Free Property

Abstract

A ternary recording code can store more information than a binary one under the same frequency bandwidth. Jacoby has proposed ternary recording codes based onthe two-level magnetic recording technique. We call a class of these codes the “Jacody-type ternary recording code”. This class of code has an adventage over multi-level recording codes on the recording system by enduring a considerable level perturbation.
This paper presents a method for systematically constructing a Jacoby-type ternary recording code by applying a finite state automation model under dkc constraints. As an example of this method, a new Jacoby-type ternary recording' code with variable-length and DC-free property is developed.