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Abstract

An apparatus and related operating method for generating slice levels adapted to an optical system is disclosed. The apparatus basically encompasses a multiplexer, a low-pass filter, a digital signal processor (DSP), a digital-to-analog converter, and a comparator. In the beginning of the track-crossing operation, the optical system will enter the first DAC mode that a pre-stored slice level derived from a calibration process is accessed and converted by the digital-to-analog converter before being referred as the slice level in the first DAC mode. When the low-pass filter can follow the RFRP signal variations, the low-pass filter is used to receive the RFRP signal and derive the slice level in the low-pass-filter mode. When a track-on command is given, the optical system will enter the second DAC mode and find an average value of the last peak-hold and bottom-hold values derived at the end of the low-pass-filter mode. The average value will be frozen and referred as the slice level in the second DAC mode, and even in the following mode after the current track-crossing operation.

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