Patent ID: 7061851
Filing Date: 2006-06-13
Classification: G11B

Abstract:
1. An information recording apparatus for use with an information recording medium for recording main data by forming a pit row or a mark row to an information recording medium by irradiating the information recording medium with a beam for recording, said information recording apparatus comprising: a first modulating signal generator configured to generate a first modulating signal in correspondence with the pit row or the mark row; a second modulator configured to generate a second modulating signal by modulating the first modulating signal by sub-data such that a pit or a mark of the pit row or the mark row is locally changed in accordance with a logical level of the sub-data; and a beam modulator configured to modulate the beam for recording by the second modulating signal; wherein the second modulator generates the second modulating signal by allocating one bit of the sub-data to the pit row or the mark row, the pit row or the mark row having a predetermined minimum length to which one bit of the sub-data is allocated that is a length by which the sub-data is correctly reproduced in a case in which the main data is correctly reproduced by an error correction code and a length by which the area to which one bit of the sub-data is allocated can be detected by optical observation; wherein the second modulator comprises: wherein the binary coefficient row generator generates at least a first and a second one of the binary coefficient rows, the disturbing unit generates a first and a second one of the disturbing signals by disturbing a first and a second one of the bit rows by the sub-data respectively by the first and the second binary coefficient rows and generates the disturbing signal by multiplexing the first and the second ones of disturbing signals.