Abstract: A method and related device are used for a DVD (Digital Versatile Disk) system to authenticate the DVD system by generating an authentication code corresponding to an inquiring code. The inquiring code has a first portion and a second portion both having at least one bit. The method comprises: generating a first sub-authentication code according to only the first portion of the inquiring code, generating a second sub-authentication code according to only the second portion of the inquiring code, and combining the first sub-authentication code and the second sub-authentication code to form the authentication code.

Abstract: A method and related apparatus for storing program code and optimized power calibration (OPC) data in the same non-volatile memory is provided. The method is used for accessing OPC data from an optical discrecorder. The optical disc recorder is capable of obtaining OPC data of an optical disc by executing an optimized power calibrating process so as to record data onto the optical disc. The optical disc recorder has a first memory with a program code being stored therein and a second memory. The method includes registering the program code in the second memory, and writing the OPC data of the optical disc to the first memory according to the program code registered in the second memory.

Abstract: A digital signal modulation method selects a modulation strategy to modulate current M sets of data by determining variations in a digital sum value (DSV) corresponding to the modulated data modulated according to a first modulation strategy from M sets of data ahead of the current M sets of data.

Abstract: A method and related apparatus for storing program code and optimized power calibration (OPC)data in the same non-volatile memory is provided. The method is used for accessing OPC data from an optical discrecorder. The optical disc recorder is capable of obtaining OPC data of an optical disc by executing an optimized power calibrating process so as to record data onto the optical disc. The optical disc recorder has a first memory with a program code being stored therein and a second memory. The method includes registering the program code in the second memory, and writing the OPC data of the optical disc to the first memory according to the program code registered in the second memory.

Abstract: A method and related device are used for a DVD (Digital Versatile Disk) system to authenticate the DVD system by generating an authentication code corresponding to an inquiring code. The inquiring code has a first portion and a second portion both having at least one bit. The method comprises: generating a first sub-authentication code according to only the first portion of the inquiring code, generating a second sub-authentication code according to only the second portion of the inquiring code, and combining the first sub-authentication code and the second sub-authentication code to form the authentication code.