The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 2006
Filed:
Dec. 13, 2002
Sung-hung LI, Shindian, TW;
Yi-lin Lai, Shindian, TW;
Sung-Hung Li, Shindian, TW;
Yi-Lin Lai, Shindian, TW;
Via Technologies, Inc., , TW;
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.