KR940010026A

KR940010026A - Fast Track Jumping Control Circuit and Method in Optical Disc Player

Info

Publication number: KR940010026A
Application number: KR1019920019433A
Authority: KR
Inventors: 김종운
Original assignee: 윤종용; 삼성전자 주식회사
Priority date: 1992-10-22
Filing date: 1992-10-22
Publication date: 1994-05-24
Also published as: KR0143544B1

Abstract

광디스크 재생장치에서 광픽업을 고속이동시 트랙횡단신호의 결락으로 인해 이동속도가 제한됨에 따라 트랙점프시간이 증가하는 것을 개선한다.In the optical disc reproducing apparatus, the track jump time increases as the moving speed is limited due to the missing track crossing signal when the optical pickup moves at a high speed.

이를 위하여 목표트랙위치에 대응하는 목표이동거리를 결정한후 광픽업을 가속이동시키고, 이동속도에 비례하는 속도검출전압에 대응하며 트랙 횡단신호의 주파수와 일치하는 주파수를 가지는 의사 트랙횡단신호의 카운트에 따른 트랙카운트신호를 발생시마다 증가카운트하고 카운트값으로 부터 트랙카운트거리를 산출하며, 상기 속도검출전압을 일정시간간격마다 샘플링하여 디지탈변환하며 디지탈변환된 데이타로 부터 이동속도를 검출하고 검출된 이동속도에 대응하는 구간이동거리를 누적하여 이동거리를 산출한다. 상기 이동거리가 목표이동거리에 도달 여부를 검사하여 목표이동거리에 도달하지 않았을시 상기 이동거리 산출을 반복하며, 목표이동거리에 도달시 상기 이동거리와 트랙카운트거리간의 오차에 따라 감속이동시킨다.To this end, after determining the target moving distance corresponding to the target track position, the optical pickup is accelerated and moved to the count of the pseudo track crossing signal having a frequency corresponding to the frequency of the track crossing signal and corresponding to the speed detection voltage proportional to the moving speed. The track count signal is incremented every time it is generated, the track count distance is calculated from the count value, the speed detection voltage is sampled at a predetermined time interval, digitally converted, the moving speed is detected from the digitally converted data, and the detected moving speed is detected. The moving distance is calculated by accumulating the interval moving distance corresponding to the moving distance. It checks whether the movement distance reaches the target movement distance, repeats the calculation of the movement distance when the movement distance does not reach the target movement distance, and decelerates and moves according to the error between the movement distance and the track count distance when the target movement distance is reached.

따라서 광픽업을 목표트랙에 정확하게 고속으로 트랙점프시키게 된다.Therefore, the optical pickup is track-jumped to the target track at high speed.

Description

Fast Track Jumping Control Circuit and Method in Optical Disc Player

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명에 따른 트랙점프 제어회로의 블럭구성도,3 is a block diagram of a track jump control circuit according to the present invention;

제4도는 본 발명에 따른 트랙점프 제어기능의 흐름도,4 is a flowchart of a track jump control function according to the present invention;

제5도는 본 발명에 따른 제4도의 트랙카운트 기능의 흐름도.5 is a flow chart of the track count function of FIG. 4 in accordance with the present invention.

Claims

Track crossing detection means for detecting a level change of a high frequency signal generated by an optical pickup and pick-up of the optical pickup and generating a track crossing signal in a binarized state, and for moving the optical pickup on an optical disc by predetermined control; An optical disc reproducing apparatus having a slide motor driving means for driving a slide motor and a sensor coil for generating a voltage proportional to the speed of the slide motor and outputting the voltage as a speed detection voltage, the optical disc reproducing apparatus having a frequency corresponding to the speed detection voltage. A pseudo track crossing signal generating means for generating a pseudo track crossing signal and matching and outputting the frequency of the generated pseudo track crossing signal by comparing with the frequency of the track crossing signal; and a pseudo track crossing output from the pseudo track crossing signal generating means. Track count up to preset value after counting signal The track counting means for generating an arc and the slide motor driving means are used to accelerate the optical pickup to accelerate the optical pickup and to increase the track count signal to calculate the track count distance, thereby determining the movement distance by the speed detection voltage. And controlling means for decelerating and controlling the movement speed of the optical pickup according to an error between the movement distance and the track count distance when the movement is completed to the movement target distance by comparing the calculated movement distance with the movement target distance. High speed track jump control circuit in an optical disc reproducing apparatus.

2. The voltage control gain variable amplifier according to claim 1, wherein said pseudo track crossing signal generating means amplifies said speed detection voltage to a gain which is variable by a predetermined control voltage, and corresponds to an output voltage of said voltage control gain variable amplifier. A voltage / frequency converter for generating a signal of frequency as a pseudo track crossing signal, a frequency comparator for comparing the frequency of the pseudo track crossing signal and the track crossing signal, and detecting a difference component, and low-passing the output of the frequency comparator A high speed track jump control circuit in an optical disc reproducing apparatus, characterized by comprising a low pass filter applied to said voltage control gain variable amplifier as a control voltage.

An optical pickup, a track crossing detection means for generating a track crossing signal according to pickup of the optical pickup, a slide motor and a slide motor driving means, a sensor coil for generating a speed detection voltage proportional to the speed of the slide motor; A pseudo track crossing signal generating means for generating a pseudo track crossing signal having a frequency corresponding to the speed detection voltage and having a frequency equal to the frequency of the track crossing signal; In the high-speed track jump control method in an optical disc reproducing apparatus having a track counting means for generating a signal, an acceleration moving process for accelerating and moving the optical pickup after determining half of the actual moving distance as a target moving distance corresponding to a target track position And a track count value that is incremented and counted each time the track count signal is generated. A track count distance calculation process for calculating a track count distance from the digital signal; and a digital conversion by sampling the speed detection voltage at predetermined time intervals, detecting a moving speed from the digitally converted data, and accumulating a section moving distance corresponding to the detected moving speed. A moving distance calculating process for calculating a moving distance by checking the moving distance, checking whether the moving distance reaches the target moving distance, and repeating the moving distance calculating process when the target moving distance has not been reached; And a deceleration moving process of decelerating and moving the optical pickup according to an error between the moving distance and the track count distance when the distance is reached.

The optical pickup according to claim 3, wherein the decelerating movement process compares the movement distance and the track count distance, and when the movement distance is greater than the track count distance, the optical pickup by the distance obtained by subtracting the error. And decelerating and moving the optical pickup by a distance obtained by adding the error to the movement distance when the movement distance is smaller than the track count distance. Control method.

※ Note: The disclosure is based on the initial application.