WPAT, PC
Device and method for detecting blank area in optical disc
A method and a device of distinguishing blank area from non-blank area in an optical disc are provided. An input signal such as a DPD TE signal or RF ripple signal is first filtered to obtain a filtered signal. A subtracting operation of the input signal and the filtered signal is then performed to obtain a first signal. According to a peak value and a bottom value of the first signal, the first signal is processed into a second signal. By comparing the second signal with a reference signal, whether the currently read area is blank area or non-blank area can be discriminated. An indicating signal is outputted at a first value to indicate the blank area while the indicating signal is outputted at a second value to indicate the non-blank area.
Sunplus Technology Co., Ltd.
G G
G11B G11B
inventional additional
Chia-Ming Shao-Lun
Chang Hung