Patent ID: 6809997
Filing Date: 2004-10-26
Classification: G11B

Abstract:
A wobble signal detection apparatus comprising:analog/digital (A/D) conversion means for A/D-converting an analog wobble signal, read from an optical disc and then band pass filtered; slope detection means for detecting a slope of the A/D-converted wobble signal according to a variation thereof; and wobble signal detection means for detecting a peak point of said A/D-converted wobble signal using the detected wobble signal slope, and detecting/outputting a square-wave wobble signal with a high level or low level transition at the detected peak point; said slope detection means calculating variations of data values of said A/D-converted wobble signal sampled within a predetermined period on the basis of predetermined different weights, accumulating the calculated values and detecting the slope of said A/D-converted wobble signal on the basis of the accumulated value, said predetermined period being an interval where at least two wobble signal data samples are obtained.