Apparatus and method for detecting wobble signal read from optical disc

Abstract

An apparatus and method for detecting a wobble signal read from an optical disc. The wobble signal detection apparatus comprises an analog/digital (A/D) converter for A/D-converting an analog wobble signal, read from the optical disc and then band pass filtered, a slope detector for detecting a slope of the A/D-converted wobble signal according to a variation thereof, and a wobble signal detector for detecting a peak point of the 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. The slope detector calculates variations of data values of the A/D-converted wobble signal sampled within a predetermined period on the basis of predetermined different weights, accumulates the calculated values and detects the slope of the A/D-converted wobble signal on the basis of the accumulated value. The predetermined period is an interval where at least two wobble signal data samples are obtained. Therefore, a stable wobble signal can be detected even though a low-frequency fluctuation component and DC offset component are introduced into the analog wobble signal read from the optical disc or the analog wobble signal varies in amplitude.

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