Recording apparatus and method, and computer program

A recording apparatus comprising:

• a detecting device for detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading a data pattern from a recording medium and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths;
• a judging device for judging whether or not a jitter obtained from the read signal is effective, on the basis of a change amount of the appearance frequency of the at least one signal component;
• a recording device for recording a test-writing data pattern onto the recording medium while changing a recording power;
• and
• a calculating device for calculating an optimum recording power used when said recording device records the data pattern onto the recording medium, on the basis of a jitter which is judged to be effective,
• said detecting device detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading the test-writing data pattern and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths, with each of the changed recording power,
• said judging device judging that a jitter corresponding to a recording power in which the appearance frequency is not less than a reference frequency of the signal component of the mark and space in the at least one signal component if the test-writing data pattern is recorded with the relatively high recording power and each of the changed recording power, at a predetermined ratio or more.

A recording method comprising:

• a detecting process of detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading a data pattern from a recording medium and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths;
• a judging process of judging whether or not a jitter obtained from the read signal is effective, on the basis of a change amount of the appearance frequency of the at least one signal component;
• a recording process of recording a test-writing data pattern onto the recording medium while changing a recording power;
• and
• a calculating process of calculating an optimum recording power used when said recording process records the data pattern onto the recording medium, on the basis of a jitter which is judged to be effective,
• said detecting process detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading the test-writing data pattern and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths, with each of the changed recording power,
• said judging process judging that a jitter corresponding to a recording power in which the appearance frequency is not less than a reference frequency of the signal component of the mark and space in the at least one signal component if the test-writing data pattern is recorded with the relatively high recording power and each of the changed recording power, at a predetermined ratio or more.

A computer-readable medium containing a computer program for recording control and for controlling a computer provided in a recording apparatus comprising:

• a detecting device for detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading a data pattern from a recording medium and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths;
• a judging device for judging whether or not a jitter obtained from the read signal is effective, on the basis of a change amount of the appearance frequency of the at least one signal component;
• a recording device for recording a test-writing data pattern onto the recording medium while changing a recording power;
• and a calculating device for calculating an optimum recording power used when said recording device records the data pattern onto the recording medium, on the basis of a jitter which is judged to be effective, said detecting device detecting an appearance frequency of at least one of a signal component of a plurality of types of marks which are included in a read signal obtained by reading the test-writing data pattern and which have different run lengths and a signal component of a plurality of types of spaces which are included in the read signal and which have different run lengths, with each of the changed recording power, said judging device judging that a jitter corresponding to a recording power in which the appearance frequency is not less than a reference frequency of the signal component of the mark and space in the at least one signal component if the test-writing data pattern is recorded with the relatively high recording power and each of the changed recording power, at a predetermined ratio or more, said computer program making the computer function as said detecting device, said judging device, said recording device, and said calculating device.