KR19980075483A - NTS / ARM Switching Unit for Video Compact Disc Players - Google Patents

Abstract

The present invention relates to an NTS / ARM switching device of a video compact disc player, comprising: a key input unit (250) for providing a selection key signal for selecting one of an NTSC or PAL composite video signal; ; An NTSC clock generator 230 for generating a clock signal having a frequency of about 3.58 MHz to form an NTSC composite video signal; A PAL clock generator 240 for generating a clock signal having a frequency of about 4.43 MHz to form a PAL composite video signal; A microcomputer 260 for generating a switching control signal for selecting an NTSC or PAL composite video signal according to the selection key signal provided from the key input unit 250; A switching unit 220 which is switched according to a switching control signal provided from the microcomputer 260 and outputs one of the clock signals provided from the NTSC clock generator 230 or the PAL clock generator 240; A Y signal generator 200 for generating and outputting a luminance Y signal based on analog R, G, and B signals; A C signal generator 210 for outputting an analog R and B signal by forming an NTSC or PAL color (C) signal according to an NTSC or PAL clock signal; And a mixer unit 270 for synthesizing the output signals of the C signal generator 210 and the Y signal generator 200 and outputting the composite video signal of the NTSC or PAL method.

Description

NTS / ARM Switching Unit for Video Compact Disc Players

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video compact disc player, and more particularly, to an entity of a video compact disc player capable of switching and outputting a video signal to be reproduced and outputted by an NTSC or PAL video signal. A seed / arm switching device.

With the development of audio and video media, optical disc players for recording and reproducing video and audio data on semi-permanent optical discs have been developed.

Such an optical disc player reproduces an image and / or audio recorded on an optical disc and outputs it through a screen and / or a speaker, and has a higher signal-to-noise ratio than conventional image and / or audio reproducing apparatus, resulting in better image quality and / or Or it can reproduce the signal with sound quality, it does not generate noise due to irregular reproduction and modulation, very low distortion, no ghost and random access, so it is rapidly developed and widely distributed. There is a trend.

In addition, as such an optical disk player, a compact disk player (CDP), a laser disk player (LDP) and a compact disk graphic player (CDGP) are developed and widely used. In addition, a recent video compact disk player (VCDP) has recurred, making it compatible to play current CDs.

1 is a schematic block diagram of a video compact disc player as described above.

As shown in FIG. 1, the video compact disc player includes a key input unit 10, a motor and motor driving unit 20, an optical pickup unit 30, an RF (radio frequency) amplifier and a servo signal processing unit 40, and a digital signal processing unit. 50, MPEG decoder 60, DRAM 70, video digital to analog converter (DAC) 80, RGB encoder 90, OSD (on screen display) processing unit 100, microcomputer 110, SRAM 120, an audio DAC 130, and a multiplexer (MUX) 140.

When the playback key signal is input from the key input unit 10 and playback starts according to the control signal of the microcomputer 110, the optical pickup unit 30 executes optical pickup from the disk loaded in the disk tray (not shown). As a result, the read RF signal is output to the RF amplifier and the servo signal processor 40.

In addition, the motor and the motor drive unit 20 drive the spindle motor (not shown) to rotate the disk and drive the optical pickup unit 30 so that the optical pickup unit 30 performs optical pickup to record the data recorded on the disk. Read and output it as an RF signal.

The RF amplifier and the servo signal processor 40 amplify the RF signal provided from the optical pickup unit 30 and provide a servo control signal according to the signal to the motor and the motor driver 20 so that the focus servo and the tracking servo are performed. To lose.

The digital signal processing unit 50 digitally processes the amplified RF signal provided from the RF signal amplification and servo signal processing unit 40, performs error detection and error correction, and outputs the result to the MPEG decoder 60.

The MPEG decoder 60 separates the error-corrected digital video signal and the audio signal provided from the digital signal processing unit 50 into a compressed state, and decodes the video data based on the MPEG compression format to decode the video DAC 80 and the audio DAC. Output to 130.

First, the video DAC 80 converts the decompressed and decoded digital video signal provided from the MPEG decoder 60 into an analog signal and provides it to the RGB encoder 90. Then, the RGB encoder 90 converts the analog video signal into a composite video signal and outputs it to a TV (not shown) through the OSD processing unit 100.

In addition, the audio DAC 130 converts the decoded digital audio signal provided from the MPEG decoder 60 into an analog signal, and then outputs it to a speaker (not shown) through the LUX / R channel switching MUX 140. Done.

On the other hand, the processing of the video signal in more detail as follows.

That is, the MPEG decoder 60 separates the video data from the compressed signal provided from the digital signal processing unit 50 without first decompressing the video data, and then decodes the data based on the MPEG-1 format to R, G, and B. Each of 8 bits, that is, a total of 24 bits of digital pixel data is output to the video DAC 80, which is output in synchronization with the horizontal synchronization signal and the color synchronization signal based on the 13.5 MHz clock generated by the internal clock generator. Accordingly, the video DAC 80 converts the digital R, G, and B signals provided from the MPEG decoder 60 into analog signals and provides them to the RGB encoder 90. Then, the RGB encoder 90 converts an analog RGB signal provided from the video DAC 80 into a composite video signal obtained by synthesizing a luminance signal and a color signal of NTSC or PAL.

By the way, the conventional video compact disc player as described above is capable of fixedly outputting a playback signal in one of the NC or ARM methods, so that the user cannot select either the NC or ARM method. There was a problem.

Accordingly, the present invention has been made to solve such a problem in the related art, and an object of the present invention is to enable a video compact disc to switch and output a video signal that is reproduced and output in a video compact disc player in an NC or ARM manner. It is to provide an NTS / arm switching device of the disc player.

According to a preferred embodiment of the present invention for achieving this object, the compressed audio and video signals reproduced and provided from a predetermined disc D are decompressed and decoded based on the MPEG compression format to R, G, and B. The video signal reproduced by a video compact disc player including an MPEG decoder for outputting digital pixel data, and a video digital / analog converter (DAC) for converting the digital pixel data provided from the MPEG decoder into an analog signal. In converting into composite video signal, it is optionally used for the NTS / PAL switching device of the video compact disc player to switch and output the composite video signal of NTSC or PAL. In order to select one of the NTSC or PAL composite video signal (composite video signal) A key input section for providing a selection key signal, an NTSC clock generator for generating a clock signal having a frequency of about 3.58 MHz for forming the NTSC composite video signal, and an approximation for forming the PAL composite video signal; A PAL clock generator for generating a clock signal having a frequency of 4.43 MHz, a microcomputer for generating a switching control signal for selecting the NTSC or PAL composite video signal according to a selection key signal provided from the key input unit, and A switching unit which is switched according to a switching control signal provided from a microcomputer and outputs a signal of one of clock signals provided from the NTSC clock generator or the PAL clock generator, an analog R, G, and the like provided from the video DAC; A Y signal generator for generating and outputting a luminance (Y) signal based on the B signal, an analog R provided from the video DAC, NT signal or PAL method by synthesizing the output signal of the C signal generation unit and the C signal generation unit and the Y signal generation unit to form a color (C) signal according to the one clock signal provided through the switching unit; And a mixer for outputting a composite video signal.

1 is a schematic block diagram of a typical optical disc player,

Fig. 2 is a block diagram of an NC / ARM switching device of a video compact disc player according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

200: Y signal generator 210: C signal generator

220: switching unit 230: NTSC clock generator

240: PAL clock generator 250: key input unit

260: microcomputer 270: mixer

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an NC / ARM switching device of a video compact disc player according to a preferred embodiment of the present invention.

As shown in FIG. 2, the NTS / ARM switching device of the video compact disc player according to the present invention includes a Y signal generator 200, a C signal generator 210, a switch 220, and an NTSC clock generator. And a PAL clock generator 240, a key input unit 250, and a microcomputer 260.

According to the present invention, the key input unit 250 provides a selection key signal for selecting one of NTSC or PAL composite video signals to the microcomputer 260, which is input by the user to the key input unit 250. This can be entered and changed by pressing the NTSC / PAL selector key (not shown).

The NTSC clock generator 230 generates a clock signal having a frequency of about 3.58 MHz to the switching unit 220 to form an NTSC composite video signal, wherein 3.58 MHz is a frequency of an NTSC color carrier. The PAL clock generator 240 generates a frequency clock signal of about 4.43 MHz, that is, a PAL color carrier, to form a PAL composite video signal, to the switching unit 220.

The microcomputer 260 generates a switching control signal to the switching unit 220 for selecting an NTSC or PAL composite video signal according to the NTSC / PAL selection key signal provided from the key input unit 250.

The switching unit 220 is switched according to the switching control signal provided from the microcomputer 260 to select one of the clock signals provided from the NTSC clock generator 230 or the PAL clock generator 240. The C signal generator 210 is provided.

On the other hand, the Y signal generator 200 synthesizes the luminance (Y) signal based on the analog R, G, and B signals provided from the video DAC 80 as described in FIG. )

In addition, the C signal generator 210 receives the R and B signals of the analog R, G, and B signals output from the video DAC 80, and outputs NTC or PAL color (C) signals according to NTSC or PAL clock signals. Formed to provide to the mixer unit 270.

Then, the mixer 270 combines the output signals of the C signal generator 210 and the Y signal generator 200 to form a composite video signal of an NTSC or PAL method, which is a TV screen (not shown) or Output to a monitor (not shown) or the like to be displayed.

As described above, the present invention has an advantage of allowing the user to select and output a composite video signal reproduced and output by a video compact disc player in a desired manner of NTSC or PAL by inputting a key signal.

Claims (1)

An MPEG decoder 60 which decompresses and decodes compressed audio and video signals reproduced and provided from a predetermined disc D according to the MPEG compression format to output digital pixel data consisting of R, G, and B; Converting a video signal played in a video compact disc player including a video digital / analog converter (DAC) 80 for converting digital pixel data provided from the MPEG decoder 60 into an analog signal. In the NCS / arm switching device of a video compact disc player for selectively switching to NTSC or PAL composite video signal and outputting the same, A key input unit (250) for providing a selection key signal for selecting one of the NTSC or PAL composite video signal; An NTSC clock generator 230 for generating a clock signal having a frequency of about 3.58 MHz to form the NTSC composite video signal; A PAL clock generator 240 generating a clock signal having a frequency of about 4.43 MHz to form the PAL composite video signal; A microcomputer 260 for generating a switching control signal for selecting the NTSC or PAL composite video signal according to the selection key signal provided from the key input unit 250; A switching unit 220 which is switched according to a switching control signal provided from the microcomputer 260 and outputs one signal among clock signals provided from the NTSC clock generator 230 or the PAL clock generator 240; ; A Y signal generator 200 for generating and outputting a luminance Y signal based on the analog R, G, and B signals provided from the video DAC 80; Generation of C signal which forms and outputs NTSC or PAL color (C) signal according to one clock signal provided through the switching unit 220 from the analog R and B signals provided from the video DAC 80. Section 210; N / S of the video compact disc player including a mixer unit 270 for synthesizing the output signals of the C signal generator 210 and the Y signal generator 200 and outputting a composite video signal of NTSC or PAL type. Arm switching device.