Method of identifying a type of optical disc

An apparatus to identify an optical disc, comprising:

• a detecting unit to detect a level of a first high-frequency signal, and to detect a level of a second high-frequency signal which is generated differently according to the type of the optical disc;
• a setting unit to set a reference value for the optical disc based upon the detected level of the first high-frequency signal;
• and
• a comparing unit to compare the reference value with the level of the second high-frequency signal and identifying the type of the optical disc,
• wherein the setting unit sets the reference value by performing an arithmetic operation on the first high-frequency signal and a predetermined setting rate which is set differently according to characteristics of the optical disc.

A computer readable medium for identifying a type of optical disc according to the method of:

• detecting a level of a predetermined first high-frequency signal from the optical disc and setting a reference value based upon the detected level of the first high-frequency signal;
• detecting a level of a predetermined second high-frequency signal which is generated differently according to the type of the optical disc;
• and
• comparing the reference value with the level of the second high-frequency signal and identifying the type of the optical disc,
• wherein the setting of the reference value includes performing an arithmetic operation on the first high-frequency signal and a predetermined setting rate which is set differently according to characteristics of the optical disc.

An apparatus to identify a type of optical disc, comprising:

• a detecting unit to detect a first high-frequency signal from the optical disc;
• and
• a setting unit to set a reference value for the optical disc based upon the detected level of the first high-frequency signal,
• wherein said detecting unit further detects a second high-frequency signal and thereby, compares the reference value and the second high-frequency signal to identify the type of optical disc,
• wherein the setting unit sets the reference value by performing an arithmetic operation on the first high-frequency signal and a predetermined setting rate which is set differently according to characteristics of the optical disc.