KR20000034392A - Method for discriminating image mode of vcd player - Google Patents

Abstract

PURPOSE: A method for discriminating image mode of VCD player is provided to improve service functions of VCD and to meet more various desires of users by sensing automatically whether a mode of image signal recorded in VCD is different from a display mode for displaying it and by displaying a guiding message according to the result. CONSTITUTION: A method for discriminating image mode of VCD player, which senses automatically whether a mode of image signal recorded in VCD is different from a display mode for displaying it and displays a guiding message according to the result, is disclosed. The method for discriminating image mode of VCD player includes step of searching a mode of image signal recorded in a disk if a key signal for playing back the disk loaded in the VCD player is inputted(203,205,209); step of displaying a warning message which means that playing back is not done normally if the mode of image signal recorded in the disk is different from a display mode of the VCD player(211,213); and step of playing back the disk after the said process of managing signals(215).

Description

How to determine the video mode of VCD player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video compact disc player, and more particularly to a video mode discrimining method in a VCD player suitable for determining a broadcast mode of a video signal recorded on an optical disc in a video compact disc player.

In general, an optical disk player capable of playing video includes a laser disk player (LDP: Laser Disk Player), a video compact disk player (VCDP), and the like. Video compression technique is used to provide viewers with video and audio by playing optical discs with video and audio data of several gigabytes (GB).

In addition, such an optical disc player reproduces an image and / or sound 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 can reproduce signals with sound quality, generate no noise due to irregular reproduction and modulation, very little distortion, no ghosts, and random access. There is a trend that is spreading.

On the other hand, among the optical discs mounted on such an optical disc player and used for VCDP among the optical discs for reproducing, as well known, not only audio data but also video data are recorded together to provide audio and video to the user. Video data recorded on the VCD can be recorded in NTSC and PAL methods, as is commonly known, and a TV or monitor connected to a VCDP for playing such a VCD to provide audio and video can also be NTSC or PAL. In this case, the video screen can be displayed only in the case of a TV or a monitor having the same method as that recorded on the VCD.

On the other hand, when playing a VCD in which NTSC video data is recorded in the VCDP, an area that is not displayed on the upper and lower portions of the screen is generated. On the contrary, a PAL VCD is converted into an NTSC TV. When the video is played back, the original video image is not displayed on the screen but the screen is cut off. As described above, in both cases, the pel-aspect-ratio of the screen does not match to display a normal image. There is no problem.

Then, the user recognizes that the reason of the problem as described above, that is, the reason why the normal video screen is not displayed as described above is caused because the method of the video signal and the display method of the TV or the monitor are different from each other in the recorded VCD. If not, there is a problem that is mistaken for the failure of the VCDP.

Accordingly, the present invention has been made in view of the above-mentioned point, and the VCD player which can automatically detect and display the guidance message accordingly when the method of the video signal recorded on the VCD and the display method of the means for displaying the same are different. The purpose of the present invention is to provide a method for determining an image mode.

In order to achieve the above object, the present invention provides a video mode discrimination method in a VCD player for reproducing and displaying a video signal recorded on a disc through a predetermined signal processing process, the disc loaded in the VCD player. Detecting a mode of a video signal recorded on the disc when a key signal for reproducing the video signal is input; A second step of displaying a warning message indicating that the playback operation is not normally performed if the mode of the video signal recorded on the disc does not match the display mode of the VCD player as a result of the detection; And a third step of playing the disc through the predetermined signal processing process.

1 is a block diagram of a VCD player suitable for applying a video mode discrimination method according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a video mode determination process in a VCD player according to a preferred embodiment of the present invention.

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

5: key input unit 10: motor and motor drive unit

15: control unit 20: optical pickup unit

25: RF amplification unit 30: digital signal processing unit

35: MPEG decoder 40: Video D / A converter

45: NTSC encoder 50: display unit

55: OSD processing unit

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

First, a key aspect of the present invention is to automatically detect when a method of displaying an image signal recorded on a VCD and a means for displaying the same is different, and to display a guide message according to the present invention. In the preferred embodiment, the case where the means for displaying the video signal of the VCD is NTSC method will be described as an example. However, the essential point of the present invention may be equally applicable to the case where the means for displaying the video signal is PAL method.

1 is a block diagram of a VCD player suitable for applying an image mode determining method according to an exemplary embodiment of the present invention. The key input unit 5, the motor and the motor driving unit 10, the control unit 15, and the optical pickup 20, RF amplifier 25, digital signal processor 30, MPEG decoder 35, video D / A converter 40, NTSC encoder 45, display 50, OSD processor ( 55).

Referring to FIG. 1, the key input unit 5 provides a function key signal input by a user to the controller 15 which will be described later. The motor and the motor driving unit 10 drive a disk by driving a spindle motor (not shown). By rotating and driving the optical pickup section 20, the optical pickup section 20 executes optical pickup from the disk to read data recorded on the disk. Accordingly, the optical pickup unit 20 is driven by the motor and the motor driving unit 10 to perform optical pickup from the disc loaded in the disc tray (not shown) to read the recorded data and output it as an RF signal. do.

The RF amplifier 25 amplifies and outputs an RF signal provided from the optical pickup unit 20, and provides a servo control signal according to the signal to the controller 15 so that focus servo and tracking servo are performed. The digital signal processor 30 performs an error detection and correction process on the amplified RF signal provided from the RF amplifier 25 and outputs the digital signal to the MPEG decoder 35.

The MPEG decoder 35 decodes an error corrected digital video signal and an audio signal provided from the digital signal processing unit 30 based on the MPEG compression format, and then performs a video D / A (digital / analog) converter 40 and audio D. Output to / A converter (not shown). The video D / A converter 40 converts the digital video signal provided from the MPEG decoder into an analog signal and provides it to the NTSC encoder 45, and the NTSC encoder 45 is provided from the video D / A converter 40. The analog video signal is encoded into an NTSC video signal and displayed on the screen through the display unit 50.

Meanwhile, according to the present invention, when the VCD played in the VCD player as described above is a PAL video signal different from the display method of the video compact disc player, the controller 15 sends a control signal to the OSD processor 55. By displaying a message indicating that the normal image cannot be displayed because the image mode recorded on the VCD is different, the user can recognize it. In this case, the method of determining the mode of the video signal recorded in the VCD by the controller 15 may be based on sequence header information (including video mode information) of the video sequence layer provided from the digital signal processor 30 or NTSC. A method of checking whether the video signal of the VCD reproduced by the encoder 45 is normally encoded can be used.

FIG. 2 is a flowchart illustrating a video mode discrimination process in a VCD player according to a preferred embodiment of the present invention. Hereinafter, a series of processes described above with reference to the accompanying drawings will be described in detail.

While the overall operation of the VCDP as shown in FIG. 1 is operating in the standby mode (step 201), when a key signal for reproducing and displaying the VCD is input through the key input unit 5 (step 203), the control unit ( 15) in response to the input key signal, determines whether the disc is loaded in the disc tray (not shown) (step 205). If the disc is not loaded as a result of the determination, an error message corresponding to the disc (eg, 'no disc is inserted') is displayed on the screen through the OSD processing unit 55 (step 207). .

On the contrary, if the disc is loaded, the video sequence provided from the digital signal processor 30 after the optical pickup is performed by driving the motor and the motor driver 10 when the disc is loaded. By checking the sequence header information of the layer or the encoding process of the NTSC encoder 45, it is detected whether the currently loaded disc is a PAL disc different from the display method of the VCDP.

At this time, as a result of the detection, in the case of a disc in the same NTSC mode as the display mode of the VCDP, a normal disc playback process is performed to display the image signal recorded on the disc through the display unit 50. On the contrary, if the detection result in step 211 described above is that the currently loaded disk is a disk in a PAL mode different from the display mode of the VCDP, the controller 15 writes to the VCD through the OSD processor 55. Since the displayed image modes are different, a guide message indicating that the normal image cannot be displayed is displayed on the screen for a predetermined time (step 213).

Then, the normal play mode operation of the VCDP is performed (step 215) to display the image signal of the loaded disc through the display unit 50 through a predetermined signal processing process (step 217).

In the present invention, as described above, the display method of the VCDP is described as an example of the NTSC mode, but those skilled in the art have a technical gist of the method of determining the video mode of the present invention. It will be appreciated that the same applies to the PAL method.

As described above, according to the present invention, when the video signal display method of the VCDP and the video signal method of the disc reproduced from the disc are different from each other, it is automatically detected and a guide message of a certain type is displayed, thereby improving the service function of the VCD. There is an effect that can, and thereby has an effect that can meet the needs of more diverse users.

Claims (1)

A video mode discrimination method in a VCD player which plays back and displays a video signal recorded on a disk through a predetermined signal processing process, A first step of detecting whether a disc is loaded in the VCD player when a key signal for playing the disc loaded in the VCD player is input; A second step of displaying an error message for the play key signal if a disc is not loaded in the VCD player; A third step of displaying a warning message indicating that the reproduction operation is not normally performed if the mode of the video signal recorded on the disc does not match the display mode of the VCD player as a result of the detection; And a fourth step of playing the disc through the predetermined signal processing process.