KR930023935A - Digital detection circuit of optical disc defect - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital circuit for detecting a defect of an optical disc from an optical disc reproducing apparatus. The invention relates to an optical pickup means for detecting an optical signal from an optical disc, an audio signal generating means for converting an optical pickup signal into a voice signal, and processing the digital signal into a digital signal. EFM signal generating means for converting into an EFM signal for a signal, voice signal amplifying means for amplifying a voice signal for detecting a defect signal, comparing means for converting a voice signal into a logic signal and removing the voice signal contained in a defective signal section, a voice signal And a defect signal detection logic means for separating the defect signal from the mixed signal of the defect signal and generating a defect detection signal.

Therefore, according to the present invention, by configuring the defect detection circuit in a digital manner, large effective values of passive elements (resistors and capacitors) required for conventional defect signal detection and lower hold are unnecessary, so that it is easy to integrate into a semiconductor chip. Since the lead pin of the device package is reduced, the manufacturing cost can be lowered, and the printed circuit of the printed circuit board is also less complicated. Therefore, the overall manufacturing cost can be greatly reduced and the reliability can be greatly improved than the conventional regeneration device. .

Description

Digital detection circuit of optical disc defect

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

3 is a schematic diagram of a digital circuit of a reproducing apparatus for detecting a defect of an optical disc as one embodiment of the present invention, and FIG. 4 is a detailed circuit diagram of a fault signal detection logic means which is a part of the schematic diagram of the digital circuit of the present invention.

Claims (7)

In detecting a defect of an optical disc from an optical disc reproducing apparatus, optical pickup means for detecting an optical signal from the optical disc, voice signal generating means for converting the optical pickup signal to a voice signal, and converting the voice signal into an EFM signal for digital signal processing EFM signal generating means, voice signal amplifying means for amplifying a voice signal for detecting a defect signal, comparing means for converting the voice signal into a logic signal and removing the voice signal included in the defect signal section, mixed signal of the voice signal and the defect signal And a defect signal detection logic means for separating the defect signal from the defect signal and generating a defect detection signal. 2. The digital defect detection circuit according to claim 1, wherein the output waveform of the audio signal generating means is input to the amplifier of the comparator and the audio signal amplifying means, respectively. According to claim 1 or 2, wherein the EFM signal generating means is composed of a comparator and an integrator, the EFM signal output from the comparator is output in an integrating waveform in the integrator, the integrated output signal is a logic of the comparator and the audio signal A digital defect detection circuit characterized in that it is inputted as a reference voltage of a comparison means for converting a signal and removing a sound signal in a defect signal section. Input unit to which the RFO signal output from the comparison unit is inputted for the defect signal detection logic means, division unit for dividing the CK signal by 1/85 to generate the counting clock signal, and the counting clock signal synchronizing the TRN to increase the period of the RFO signal. And an output waveform shaping unit configured to output a defect detection signal by sampling and holding the period of the signal counted up by the synchronization count unit and the period of the divided clock clock signal. Digital defect detection circuit. 5. The frequency converter of claim 4, wherein the input unit is composed of one DRN to form an RFO signal as a D input, and the divider is combined with one DRN to divide and synchronize the input CK signal frequency by combining seven TRNs and logic gates. And a clock counter and a logic gate of the TRN of the counter unit, wherein the synchronous counter unit is formed by combining nine TRNs and logic gates. 6. The digital defect detection circuit according to claim 5, wherein the DRN and the TRN have a reset terminal and are booted by a clock signal. 5. The digital defect detection circuit according to claim 4, wherein the defect signal detectable by said defect signal detection logic means has a period of 50 sec to 1.4 msec. ※ Note: The disclosure is based on the initial application.