Patent ID: 7386780
Filing Date: 2008-06-10
Classification: G11B

Abstract:
1. A method for encoding information to be transmitted in a digital communication or storage system, the method comprising the steps of: modulation encoding the information using a modulation code defined by at least one modulation constraint to generate modulation encoded information including a plurality of information bits; parity encoding the modulation encoded information in a manner that adds at least one parity bit to the modulation encoded information; and precoding the parity encoded information in such a way that the precoded encoded information does not violate the at least one modulation constraint, wherein the at least one modulation constraint includes a direct current (DC) constraint, and wherein the precoding step precodes the encoded information in such a way that the precoded encoded information satisfies the DC constraint and, wherein, after the parity encoding step has added the at least one parity bit to the information bits in the modulation encoded information, the precoding step precodes the information bits in the parity encoded information without precoding the parity bits in the parity encoded information.