Patent ID: 6731228
Filing Date: 2004-05-04
Classification: H03M

Abstract:
A method of converting a series of data word into a modulated signal, comprising the steps of:(a) generating for each data word a number of alternative sequences by combining mutually different digital words with the data word; (b) translating each alternative sequence into a (d,k) constrained sequence according to a predefined coding rate m/n; (c) detecting development of digital sum every bit for each translated (d,k) constrained sequence, counting sign changes of each development of digital sum, and checking whether or not each development of digital sum is beyond a preset threshold; and (d) sorting out the translated (d,k) constrained sequences based on whether each development of digital sum is beyond the preset threshold, and selecting one (d,k) constrained sequence, of which development of digital sum undergoes sign changes most, for recording onto a recordable medium among the sorted-out sequences.