Track count method for an optical disc in an optical disc system

Abstract

A method for counting a number of tracks of an optical disc in an optical disc system. The optical disc system includes an optical pickup, a light source, and a plurality of optical sensors. The method includes emitting a light beam to the optical disc from the light source, detecting light reflected from the optical disc by the optical sensors, and generating a tracking error signal according to detected signals of the optical sensors while the optical pickup moves along a radial direction of the optical disc. The method further includes generating a tracking error zero crossing signal according to the tracking error signal, generating a peak detecting signal according to the tracking error signal, generating a pseudo radio frequency zero crossing signal according to the peak detecting signal, and generating a track count signal according to the pseudo frequency crossing signal.

Description

BACKGROUND OF INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a track count method for an optical disc in an optical disc system, and more particularly, to a track count method which generates track count signals based on generating a pseudo radio frequency zero crossing signal.[0003]2. Description of the Prior Art[0004]Before an optical pickup starts to read / record data from / to a compact disc or a digital versatile disc (DVD), it has to move to a target track of the compact disc or the DVD. When the optical pickup searches for the target track it crosses other tracks. The distance between the present location of the optical pickup and the target track can roughly be divided into two possible situations, short-term track crossing(short seek) and long-term track crossing(long seek). In both of these situations, the relative speed and direction between the optical pickup and the optical disc are important factors when an optical disc system controls the ...

AI Technical Summary

Benefits of technology

[0008]It is an advantage of the claimed invention that the track count method for an optical disc in an optical disc system can generate the pseudo RFZC signal with better quality than the radio frequency ripple signal used in the prior art so that the optical disc system reads / records data from / to the optical disc more accurately by using the signal with better quality.

Problems solved by technology

This results in a substantial amount of noise, so that it is difficult to select a correct radio frequency zero crossing signal.

As a result, the optical disc system cannot function well relying on the optical pickup, which cannot read the track cross signals accurately.

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