Samsung Electronics Co., Ltd.

Jin-woo Yu

Young-ki Byun

A method for correctly determining optimum recording power through detecting whether a radio frequency (RF) top channel signal is correct, including determining a certain location for performing optimum power control (OPC) by checking a counter area in a power calibration area (PCA) in an optical recording medium, and recording an eight to fourteen modulation signal (EFM) in a test area in the PCA, performing analog/digital sampling with respect to an RF top channel signal and an RF bottom channel signal which are generated while reading test data repeatedly recorded in the PCA in regular sequence, and checking a noise level of the sampled RF top channel signal, and when the noise level of the RF top channel signal is greater than a preset reference value, determining that an error has occurred in detecting the optimum recording power to therefore abandon a certain area in the PCA wherein the OPC is being performed, and re-performing the OPC in a new area. Accordingly, by detecting whether the top channel signal is correct and re-performing the OPC when the top channel signal has an error, the optimum recording power can be more correctly determined.

Method for determining optimum recording power through detecting whether RF top channel signal is correct

A method and apparatus for preventing a malfunction of a disc drive due to an operation error of a correction function for a minimum pit length by selectively performing the correction function based on an operative state of the disc drive. The method includes a first monitoring operation determining whether an operative state of the disc drive is stable when a disc is loaded into the disc drive, controlling a turning on of a correction function for a minimum pit length if the operative state of the disc drive is stable, and a second monitoring operation determining whether the operative state of the disc drive is stable after turning the correction function for the minimum pit length on and turning the correction function off if the operative state of the disc drive is determined to be unstable based on the second monitoring result.

Method and apparatus for preventing malfunction of disc drive

An apparatus for setting an offset in a DVD player includes: an offset measuring unit which measures one or more offset parameters for initial reproducing operations of the DVD player; and an offset setting unit which, when the offset measuring unit measures the one or more offset parameters a number of times, calculates an average value of the measured offset values of the one or more offset parameters and sets, for each of the one or more offset parameters of the DVD player, the average value as a set offset value.

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Gyeonggi-do, South Korea

Jin-woo Yu