Patent ID: 7519119
Filing Date: 2009-04-14
Classification: G11B,H03M

Abstract:
1. A method of converting a series of data word into a modulated signal with coding rate of m/n, comprising the steps of: (a) using a generator, generating for each data word a number of intermediate sequences by combining mutually different digital words with the data word; (b) scrambling each intermediate sequence to form a set of alternative sequences; (c) translating each alternative sequence into a (d,k) constrained sequence according to the coding rate m/n; (d) measuring how much undesirable each (d,k) constrained sequence is, based on at least one of a “0” runlength (consecutive “0”s), an occurrence of a prescribed sync pattern and an alternate Tmin (minimum inversion period) runlength; and (e) selecting one (d,k) constrained sequence for recording onto a recordable medium among the translated (d,k) constrained sequences based on the measuring.