KR910003600A - Data reproducing apparatus of WORM type optical disc drive device - Google Patents

Abstract

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Description

Deata playback device of WORM type optical disk drive device

Since this is an open matter, no full text was included.

5 is a data reproducing apparatus of the present invention;

FIG. 6 is a pupil waveform diagram of FIG.

FIG. 7 is a waveform diagram illustrating a process in which noise included in data is removed by an AND gate of FIG. 5.

Claims (1)

A data reproducing apparatus of a WORM type optical disc drive field, comprising: first digital conversion means for converting an electrical signal reproduced on the disc into a digital signal having a pulse width equal to the groove size of the disc, and inputting the first digital conversion signal; Sector mark detection means for detecting the presence or absence of sector mark data and generating a first control signal when the sector mark is detected, and generating a pulse at the data recording position of the disc by converting the reproduced electrical signal and converting the digital signal. And a digital multiplication means for performing a logical multiplication on the first and second digital signals to remove noise components contained in the reproduction signal, and generating pulse data having a predetermined pulse width in accordance with the output of the logical multiplication means. Means, and outputs the output of the pulse generating means to a decoder, when the sector mark detecting means generates a first control signal. And means for selectively outputting the first digital converted signal to the decoder. ※ Note: The disclosure is based on the initial application.