KR940008507A - Standard and European dropout compensation method and compensation circuit - Google Patents

Abstract

The present invention relates to a dropout compensation method of a laser disc player and a dropout compensation arc for implementing the compensation method, wherein a dropout is generated based on a reproduction horizontal synchronization signal. Waiting until the deviation allowable range and outputting the reproduction horizontal synchronization signal as it is when the reproduction horizontal synchronization signal is received within the allowable deviation range, otherwise, sending out a first virtual horizontal synchronization signal to compensate for the dropout, wherein the first virtual horizontal When compensating with the synchronization signal, the second virtual horizontal synchronization signal is transmitted by subtracting the time added by the deviation allowance from the normal position, and the virtual horizontal synchronization signal sweep performs the dropout compensation to the normal position. Compensating for the dropout caused by .

Therefore, the DROP OUT compensation method and the compensation circuit diagram of the laser disk player of the present invention can be applied to both NTSC and PAL methods, and the image quality can be improved by compensating the dropout accurately by a simple method.

Description

Standard and European dropout compensation method and compensation circuit

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

1 is a waveform diagram of a horizontal synchronizing signal reproduced normally and a horizontal synchronizing signal in which dropout occurs.

2 is a dropout compensation circuit of a laser disc player according to one embodiment of the present invention.

FIG. 3 is a waveform diagram showing the output of the dropout compensation circuit of the laser disk player of FIG.

Claims (7)

In the NTSC and PAL dropout compensation method, the playback horizontal synchronization signal is waited for the deviation allowable range of the position where the playback horizontal synchronization signal should come from, and when the reproduction horizontal synchronization signal is received within the deviation allowable range, the playback horizontal synchronization signal remains as it is. Outputting a signal and compensating for the dropout by outputting a first virtual horizontal synchronization signal if the regeneration horizontal synchronization signal does not come within the allowable deviation due to a dropout, and compensating for the dropout by the first virtual horizontal synchronization signal; Compensating the dropout by transmitting the second virtual horizontal synchronization signal by subtracting the time added by the deviation allowable range from the normal position, and compensating the dropout by the virtual horizontal synchronization signal sweep performing the dropout compensation to the normal position. NTSC and PAL combined dropout compensation room characterized in that . In the NTSC and PAL combined dropout compensation circuit, the reproducing horizontal synchronizing signal applying means, the virtual horizontal synchronizing signal generating means, and the reproducing horizontal synchronizing signal applying means to the deviation allowable range of the position where the applied regenerating horizontal synchronizing signal should come from. Wait for the regeneration horizontal synchronization signal within the deviation allowable range, and output the regeneration horizontal synchronization signal as it is. If the dropout occurs and the reproduction horizontal synchronization signal does not come within the deviation allowance range, the virtual horizontal synchronization signal is sent out to compensate for the dropout. Combined dropout compensation method of NTSC and PAL method characterized in that it comprises a horizontal synchronous signal detection and output means. 3. The apparatus of claim 2, wherein the virtual horizontal synchronization signal generating means comprises: a clock generator for generating a clock in accordance with an NTSC scheme or a PAL scheme, and for selecting a signal generated from the clock generator in accordance with an NTSC scheme or a PAL scheme; A first selector, a second selector for selecting a signal selected by the first selector according to a regeneration horizontal driving mechanism + error tolerance range, a regeneration horizontal driving mechanism error tolerance range, and a regeneration horizontal driving mechanism; If the signal selected through the selection unit is NTSC system is synchronized to the first clock, if the PAL method NTSC characterized in that it comprises a delay for correcting the correct horizontal horizontal unit according to the NTSC method or PAL method by registering in the second clock And PAL dropout compensation circuit. 4. The apparatus of claim 3, wherein the first selector comprises an NTSC or PAL selective signal applying unit, a main counter for counting clock signals generated from the clock generator, a decoder for decoding signals counted in the main counter, Combined drop of NTSC and PAL method characterized in that it comprises a plurality of multiplexer for selecting the value decoded by the decoder in accordance with the NTSC or PAL method by receiving the selection signal from the NTSC or PAL method selection signal applying unit Out compensation circuit. 4. The multiplexer and virtual horizontal synchronization signal according to claim 3, wherein the second selector selects again according to the reproduction horizontal synchronism period + error allowable range, the reproduction horizontal synchronism-error allowable range, and the reproduction horizontal synchronism period by the first selection unit. And a virtual horizontal synchronous signal counter for applying a selection signal for selecting a signal according to the regeneration horizontal synchronization mechanism + error tolerance range, the regeneration horizontal synchronization mechanism-error tolerance range, and the regeneration horizontal synchronization mechanism to the multiplexer. Combined dropout compensation circuit with NTSC and PAL. 4. The composite latch and clock generation of claim 3, wherein the delay unit includes a first clock terminal and a second clock terminal to ensure that the horizontal synchronization signals compensated in the NTSC method or the PAL method are exactly matched to one horizontal driving mechanism. NTSC, characterized in that it comprises a logic circuit for selecting the second clock terminal of the composite latch if the selection signal for input the clock generated from the negative signal and the NTSC method or PAL method is input to the PLA method. And a PAL dropout compensation circuit. 4. The multiplexer of claim 3, wherein the multiplexer of the first selector comprises: a first multiplexer for selecting a decoding value for compensating a first dropout, a second multiplexer for selecting a decoding value for compensating a second dropout, and a third And a third multiplexer for selecting a decoding value for compensating for the dropout of the NTSC and PAL dropout compensation circuits. ※ Note: The disclosure is based on the initial application.