KR0177241B1 - Apparatus for processing a chosen video signal in video cd player - Google Patents

Abstract

The present invention relates to a video signal selection processing apparatus used for a video CD player, and to read data recorded on the video CD to determine whether the recording method of the video CD is NTSC or PAL. A microcomputer 80 for generating control signals, a 3.58 MHz oscillator 85 for generating a 3.58 MHz color sub-carrier signal, and a 4.43 MHz for generating a 4.43 MHz color subcarrier signal The switching unit 100 which is switched under the control of the oscillator 90 and the microcomputer 80 and passes the subcarrier signal of 3.58 MHz or the subcarrier signal of 4.43 MHz, and under the control of the microcomputer 80. Conversion processing to an analog signal according to a synchronization signal generator 120 for selectively generating horizontal and vertical synchronization signals, and a 3.58 MHz subcarrier signal or a 4.43 MHz subcarrier signal horizontal and vertical synchronization signal And an RGB encoder 140 which converts the provided video signal into an RGB signal and outputs the RGB signal, and determines whether the disc has been recorded in NTSC or PAL format in each case. By properly processing the video signal, an optimal image can be obtained without manual operation by a user.

Description

Video signal selection processor used in video CD player

1 is a schematic block diagram of a video signal selection processing apparatus used in a conventional video CD player.

2 is a block diagram of a video signal selection processing apparatus used for a video CD player according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10,100: switching unit 11,85: 3.58 MHz oscillator

12,90: 4.43 MHz oscillator 13: multiplexer

14,120: synchronization signal generator 15,140: RGB encoder

20: spindle motor 30: spindle drive

40: RF amplifier 50: optical pickup drive unit

60: servo control unit 70: digital signal processing unit

80: micom 110: MPEG decoder

130: Video DAC

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video compact disc player (hereinafter referred to as a video compact disc player). In particular, the recording method is automatically determined by reproducing a video signal recorded on a disc by NTSC or PAL. A video signal selection processing device used in a video CD player for reproducing a video signal according to a recording method.

Generally, video signals are recorded in NTSC or PAL according to a source picture.

Although the video signal recorded in the NTSC or PAL system can be played by the video CD player, the played video output signal is limited to either the NTSC or PAL system or to be played back according to the recorded system. In most cases, the user needs to make external adjustments.

On the other hand, according to the video CD standard, video data recorded on the video CD is defined as follows.

That is, picture-size / picture-rate are two types of 352 × 240 / 29.97Hz and 352 × 240 / 23.976Hz for NTSC, and 352 × 288 / 25Hz for PAL. .

In addition, the color subcarrier frequency is 3.58 MHz for NTSC and 4.43 MHz for PAL.

Therefore, when reproducing video data recorded in the NTSC system or the PAL system, the SYNC signal and the color subcarrier signal must be generated in accordance with the scheme, respectively, so that the video signal can be reproduced properly.

1 is a schematic block diagram of a video signal selection processing apparatus used in a conventional video CD player.

As shown in FIG. 1, a video signal selection processing apparatus used in a conventional video CD player includes a switching unit 10, a 3.58 MHz oscillator 11, a 4.43 MHz oscillator 12, a multiplexer 13, The RGB encoder 15 and the synchronization signal generator 14 can be briefly represented.

The switching unit 10 is a manual switch which must be manually operated by a user and may be configured as a slide switch or a push botton. That is, after the user recognizes whether the data recorded in the video CD is NTSC or PAL, the user manually manipulates the switching unit 10 to turn on or off. The power supply Vcc is grounded through the switching unit 10, and conversely, in the switch 'off' state, the power supply Vcc is provided to the multiplexer 13 and the synchronization signal generator 14.

On the other hand, the output signals of the 3.58 MHz oscillator 11 and the 4.43 MHz oscillator 12 are both being input to the multiplexer 13. As a result, the multiplexer 13 is connected to the 3.58 MHz oscillator 11 or 4.43 MHz oscillator 12 by a power supply Vcc provided or not provided according to the 'on' or 'off' of the switching unit 10. One of the output signals is selected and output to the RGB encoder 15. That is, the power supply Vcc acts as a select signal of the multiplexer 13.

In addition, the synchronization signal generator 14 selectively generates a synchronization signal having a frequency according to the PAL or NTSC method as the power source Vcc is provided or not, and provides the same to the RGB encoder 15.

Accordingly, the RGB encoder 15 is a video CD (not shown) in accordance with the 3.58 MHz or 4.43 MHz color subcarrier signal provided from the multiplexer 13 and the synchronization signal provided from the synchronization signal generator 14. The video signal read out from the video signal) can be properly processed and output according to the recorded method, that is, the NTSC or PAL method.

However, such a conventional device has the inconvenience of requiring the user to know the recording method of data recorded in the video CD in advance, and to manually operate the switch.

Accordingly, the present invention has been proposed to solve such inconveniences, and an object of the present invention is to read disc information recorded on a video CD, recognize a data recording method, and then automatically adjust the data accordingly. The present invention provides a video signal selection processing device for a video CD player.

According to a preferred embodiment of the present invention, the video CD player determines whether the recorded video data is NTSC or PAL when reproducing the data recorded on the video CD, and then appropriately processes the video signal reproduced accordingly. A video signal selection processing apparatus used for a C.D player, comprising: reading data recorded in a sequence header of a video sequence layer region among data recorded in the video C.D. A microcomputer that determines whether the recording method of the CD is NTSC or PAL, and generates a control signal according thereto, 3.58 MHz oscillator that generates a 3.58 MHz color sub-carrier signal, and 4.43 MHz 4.43MHz oscillator for generating a color subcarrier signal of the switch and under the control of the microcomputer 3.5 A switching unit for passing an 8 MHz subcarrier signal or a 4.43 MHz subcarrier signal, a synchronization signal generator for selectively generating horizontal and vertical synchronization signals in the NTSC or PAL method according to the control of the microcomputer; The analog signal is provided by being converted into an analog signal according to the subcarrier signal of 3.58 MHz or the subcarrier signal of 4.43 MHz and the horizontal and vertical synchronization signals provided from the synchronization signal generator. It is converted into a log signal, and converted into an RGB signal and outputted to include an RGB encoder.

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

2 is a block diagram of a video signal selection processing apparatus used for a video CD player according to a preferred embodiment of the present invention.

As shown in FIG. 2, the present invention provides a spindle motor 20, a spindle driver 30, an RF amplifier 40, an optical pickup driver 50, and a servo controller which are general components of a video CD player. 60, digital signal processor (DSP) 70, MPEG decoder 110, audio digital-analog converter (DAC) 150, video digital-analog converter (140), RGB encoder It is used in combination with the 140, and consists of the microcomputer 80, 3.58MHz oscillator 85, 4.43MHz oscillator 90, the switching unit 100, the synchronization signal generator 120.

When a video CD is loaded into a disc tray (not shown), the microcomputer 80 first performs overall function control of the spindle servo, focusing / tracking servo, and playback processing device to reproduce information about the disc. Further, according to the data recorded in the sequence header of the video sequence layer region read out from the disc which is the current playback target, it is determined whether the disc recording method is NTSC or PAL. The control signal is provided to the switching unit 100 and the synchronization signal generator 120.

Then, the switching unit 100 is switched according to the control signal of the microcomputer 80 to select one of the 3.58 MHz oscillator 85 or the color subcarrier signal of 4.43 MHz to be provided to the RGB encoder 140.

In addition, the synchronization signal generation unit 120 selects and generates vertical and horizontal synchronization signals in the NTSC or PAL method under the control of the microcomputer 80 to generate the MPEG decoder 110, the video DAC 130, and the RGB encoder 140. To provide.

Meanwhile, the servo controller 60 servo-controls the spindle motor 20 that drives the disk D at constant speed through the spindle driver 30 according to the servo control signal provided from the microcomputer 80, and the optical pickup driver ( 50), the focusing / tracking servo of the optical pickup 55, which is a laser information reading means, is controlled. However, the RF amplifying unit 40 amplifies the RF signal read from the disk D by the optical pickup 55, and the digital signal processing unit 70 converts the RF signal amplified by the RF amplifying unit 40 into a digital signal. The process is provided to the MPEG decoder 110.

The MPEG decoder 110 reads from the disc D under the control of the microcomputer 80 and processes the digital signal provided by the RF amplifier 40 and the digital signal processor 70 to the synchronization signal generator 120. Based on the vertical and horizontal synchronization provided from the) to decode the video and audio signal and provide to the video DAC 130 and audio DAC 150, respectively.

Then, the audio DAC 150 converts the signal into an analog signal and outputs it, and the video DAC 130 analyzes the provided video signal according to the vertical and horizontal synchronous signals provided from the synchronization signal generator 120. The signal is converted into a log signal and provided to the RGB encoder 140.

Thereafter, the RGB encoder 40 is connected to the video DAC 130 according to the color subcarrier signal of 3.58 MHz or 4.43 MHz provided through the switching unit 100 and the horizontal and vertical synchronization signals provided from the synchronization signal generator 120. The signal provided from is converted into an RGB signal for display on the screen and output.

In summary, in the MPEG header of the video disc D, data indicating whether the encoder is encoded in the NTSC method or the PAL method is recorded in the sequence header of the video sequence layer. By reading the double pixel-aspect-ratio or picture-rate, it is possible to simply determine whether it is encoded in NTSC or PAL.

Accordingly, the microcomputer 80 determines whether the PAL method or the NTSC method is used according to the pixel-to-aspect ratio or picture-rate signal, and provides the control signal accordingly to the switching unit 100 and the synchronization signal generator 120. This allows the signal recorded in the to be properly reproduced.

Therefore, in the present invention, by determining whether the disc is recorded in NTSC or PAL mode and processing the video signal appropriately in each case, when the video disc is reproduced, an optimum image can be obtained without manual operation by the user. It can be effective.

While the invention has been shown and described with reference to certain preferred embodiments, those skilled in the art will recognize that various modifications and changes can occur without departing from the spirit and scope of the invention as set forth in the following claims.

Claims (2)

Video used by the video CD player to determine whether the recorded video data is NTSC or PAL when the data recorded on the video CD is played by the video CD player, and to properly process the video signal to be played accordingly. A signal selection processing apparatus, comprising: reading data recorded in a sequence header of a video sequence layer region among data recorded in the video CD to record the video CD. A microcomputer 80 for determining whether the system is a PAL or PAL system and generating a control signal accordingly; A 3.58 MHz oscillator 85 for generating a 3.58 MHz color sub-carrier signal; A 4.43 MHz oscillator 90 for generating a 4.43 MHz color subcarrier signal; A switching unit (100) switched under the control of the microcomputer (80) to pass the 3.58 MHz subcarrier signal or 4.43 MHz subcarrier signal; A synchronization signal generator 120 for selectively generating horizontal and vertical synchronization signals in the NTSC or PAL method according to the control of the microcomputer 80; According to the subcarrier signal of 3.58MHz or the 4.43MHz subcarrier signal provided through the switching unit 100 and the horizontal and vertical synchronization signals provided from the synchronization signal generator 120, the signal is converted into an analog signal. A video signal selection processing device for a video CD player comprising an RGB encoder (140) for converting a processed video signal to an RGB signal for output. The video system of claim 1, wherein the microcomputer 80 reads the pixel-aspect-ratio or picture-rate recorded in the sequence header of the video sequence layer region. A video signal selection processing apparatus for a video CD player characterized by determining whether recorded data is the NTSC system or the PAL system.