KR960001491B1 - Searching method and the suitable apparatus for cdp - Google Patents

Abstract

playing with faster speed than the speed of normal playing speed; supplying coded voice signals to a speaker; generating video signals by operating a CDG replaying unit and supplying the generated video signals to a screen display unit; and displaying a screen according to the video signals.

Description

Searching method of compact disc player and suitable device

1 is a configuration diagram showing the configuration of a conventional compact disc player.

FIG. 2 is a diagram for explaining a screen state in a search operation of the apparatus shown in FIG.

3 is a flowchart illustrating a search method according to the present invention.

4 shows the format of packet data in the CDG.

5 shows the format of pack data in the CDG.

6 shows the memory configuration in the TV-graphics mode.

7 is a block diagram showing an embodiment of a compact disc player according to the present invention.

FIG. 8 is a diagram for explaining a screen state in the search operation of the apparatus shown in FIG.

The present invention relates to a compact disc graphic (CDG) player, and more particularly, to a search method and apparatus suitable for setting a display screen to a screen having a specific color during a search operation.

Compact disc graphics (CDG) refers to a method of recording graphic information using subcodes of compact discs. The graphic information recorded on the disc is decoded by the compact disc graphic reproducing unit and displayed on the display device. Using the CDG method, it is possible to display a graphic screen accompanying the music information, for example, lyrics, a background screen, etc., on the display device while playing music information.

The graphic information decoded by the CDG CDG reproducing unit is stored in the picture memory. The contents stored in the image memory are periodically read out, converted into image signals, and provided to the display device.

On the other hand, among the operation modes of the CDGP, there is a search mode for specific contents. In the seek mode, data is played while rotating the disc at a speed faster than the normal playback speed. At this time, the audio signal accurately follows the search speed and can be reproduced at a high speed, but there is a problem that the displayed screen is messed up because the graphic signal cannot be followed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an improved search method for setting a screen displayed on a display device to a screen having a specific color in a CDGP search operation.

Another object of the present invention is to provide an apparatus suitable for the above-described searching method.

The compact disc graphics player searching method according to the present invention achieves the above object. Driving at a different speed than the traveling speed of the vehicle; Operating a CD player to intermittently decode voice data provided from the CD deck, and provide a decoded voice signal to the speaker; Operating a CDG reproducing unit to generate a video signal corresponding to a screen erased with a specific color and providing the generated video signal to a screen display unit; And displaying a screen corresponding to the video signal through a screen display unit.

In accordance with another aspect of the present invention, a compact disc graphics player controls a CD deck in response to a command applied through an input unit, provides a decoded audio signal to a speaker, and provides a CDG playback unit. A compact disc graphics player comprising a control unit for providing a graphic signal decoded by the control unit to a screen display unit, wherein the control unit provides the CDG reproducing unit to generate a screen erasing signal when a search operation mode is designated through the command input unit. The CDG reproduction unit may provide a video signal corresponding to a screen erased with a specific color to the screen display unit in response to a screen erase signal applied from the controller. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the structure of a conventional CDGP. The apparatus shown in FIG. 1 includes a CD deck 10, a CD playback unit 12, a CDG playback unit 14, a screen display unit 16, a control unit 18, a command input unit 20, and a speaker 22. It is provided.

In the apparatus shown in FIG. 1, when a normal operation mode command is input through the command input unit 20, the controller 18 detects this and gives normal operation mode data so that the CD player 12 operates normally.

As the CDG disc mounted on the CD deck 10 rotates, audio data and graphic data recorded on the disc are reproduced and provided to the CD reproducing unit 12. The CD player 12 decodes the voice signal from the voice data and provides it to the speaker 22 while providing the graphic data to the CDG player 14. The CDG reproducing section 14 reproduces the graphic signal from the graphic data provided by the CD reproducing section 12 and provides it to the screen display section 16.

On the other hand, when the search operation mode command is input through the command input unit 20, the controller 18 detects this and gives the search operation mode data so that the CD player 12 performs the search operation.

As the CDG disc mounted on the CD deck 10 rotates, audio data and graphic data recorded on the disc are reproduced and provided to the CD reproducing unit 12. In the seek mode, the CDG disc rotates at a faster speed than the normal operation mode, and the CD player 12 intermittently decodes the reproduced audio data and graphic data. The decoded audio signal is provided to the speaker 22 and provides graphic data to the CDG reproducing unit 14.

The CDG reproducing section 14 reproduces the graphic signal from the graphic data provided by the CD reproducing section 12 and provides it to the screen display section 16. In this case, the graphic data provided in the search mode is partial data reproduced intermittently, not all data. Therefore, the graphic signal generated by the CDG reproducing section 14 is a screen (destructed screen) that includes only a part of the screen or no part.

In the apparatus shown in FIG. 1, data and screen states in each mode are shown in FIG.

3 is a flowchart illustrating an embodiment of a screen erasing method in a search operation mode according to the present invention. In the flowchart shown in FIG. 3, when the search operation mode is designated through the command input unit 20, the controller 18 recognizes this and controls the search mode operation as in the related art, while controlling the CDG playback unit 14 to display the screen. The screen displayed on the display unit 16 is controlled to be erased with a specific color.

When the search operation mode command is input through the command input unit 20, the control unit 18 detects this and gives the search operation mode data for the CD playback unit 12 to perform the search operation while erasing the screen to the CDG playback unit 14. (Sign 300). (Step 300)

The CD player 12 intermittently decodes the player audio data and the graphic data, provides the decoded audio signal to the speaker 22, and provides the graphic data to the CDG playback unit 14.

The CDG reproducing unit 14 generates a video signal corresponding to a screen that has been specifically erased with a color, for example, a blue back screen, in response to the picture erasing signal applied from the control unit 18 to generate a video signal to the screen display unit 16. to provide.

At this time, the graphic data provided from the CD player 12 is ignored (step 302).

The control unit 18 waits for the command indicating the end of the search operation mode to be applied from the command input unit 20 (step 304).

When the search operation end command is input through the command input unit 20, the control unit 18 detects this and gives the search operation end data so that the CD playback unit 12 ends the search operation and applies it to the CDG playback unit 14. The signal (screen erase signal) indicating the canceled screen is removed (step 306).

The CDG reproducing unit 14 does not generate a video signal corresponding to a screen that is specifically erased with a color, for example, a blue back screen, when the control unit 18 does not apply the screen erasing signal (step 308).

The operation of erasing the screen to a specific color in the CDG playback unit 14 will be described in detail. 4 is a diagram showing a format of packet data in which graphic data of a CDG is recorded. In the CD format, a subcode having a size of 1 byte per frame is included, and 89 subcodes belonging to 98 consecutive frames are gathered to form an information unit called a packet. Each bit string is called a channel when each subcode is sequentially arranged in the vertical direction.

Since the subcode consists of 1 byte, that is, 8 bits, there are eight channels corresponding thereto, and each channel is a P, Q, R, S, T, U, V, W channel from the left. Here, the P channel and the Q channel each contain data of a track start and end and a table of content (TOC).

Graphic data is recorded using the remaining six channels (R-W). In detail, the packet is again composed of four symbols, each of which consists of four packs of PACKs.

5 shows a format of pack data, each pack having a data area of 20 symbols and a parity area of 44 symbols. In addition, the most significant symbol of the data area represents a mode-item, where the upper three bits (R-T) represent the mode (MODE), and the lower three bits (U-W) represent the item (ITEM).

The contents of MODE-ITEM are shown in Table 1 below.

TABLE 1

Among these, line graphic mode, TV graphic mode, and extended TV graphic mode are classified according to the resolution of the screen.

The second symbol of the data area indicates an instruction (INSTRUCTION) and indicates the contents of the upper data area.

The contents of INSTRUCTION in the TV-graphics mode are shown in Table 2 below.

TABLE 2

Among these, the preset memory presets all the contents stored in the memory to a predetermined color. This is indicated once every 16 packs in normal operation mode.

Using the preset memory in navigation mode allows you to preset what is displayed on the screen to a specific color.

The font data stored in the memory is stored in address order from the fourth symbol to the nineteenth symbol of the data area.

6 is a diagram showing the configuration of the memory in the TV-graphics mode. The TV-graphics memory consists of 18 * 50 fonts (FONT), and the fonts consist of 6 * 12 pixels. In this case, the area of the 16 * 48 font is called a screen (SCREEN), and the invisible area outside the screen area is called a border.

The content stored in the TV-graphics memory is periodically read out and converted into an analog signal and provided to the screen display unit 16 as a video signal.

If all fonts stored in the TV-graphics memory are preset to a specific color by using the preset memory in the search operation mode, the screen displayed on the screen display unit 16 displays, for example, a blue back screen.

7 shows the configuration of the CDG reproducing apparatus according to the present invention. The apparatus shown in FIG. 5 differs from the apparatus shown in FIG. 1 in that a path for applying the CDG playback unit 14 screen erase signal is additionally provided in the control unit 18. FIG.

When the search operation mode is commanded from the command input unit 20, the controller 18 generates a screen erase signal and applies it to the CDG reproducing unit 14. The CDG reproducing section 14 resets all fonts of the built-in TV-graphics memory to a specific color in response to the screen erasing signal. Accordingly, the screen display unit 16 displays the screen erased with a specific color.

In the apparatus shown in FIG. 7, data and screen states in each mode are shown in FIG.

As described above, according to the screen erasing method according to the present invention, an abnormal screen is prevented from being displayed by erasing the screen displayed on the screen display unit in a specific color in the search operation mode.

In an embodiment of the present invention, an example of erasing all fonts stored in the TV-graphic memory built in the CDG reproducing unit in a specific color in response to a screen erasing signal generated by the control unit is disclosed.

As another example, a blueback screen generator may be built in, and a signal generated by the blueback screen generator may be selected and output in response to the screen erase signal.

Claims (2)

A search method of a compact disc graphics player, comprising: operating a CD deck by operating a CD deck when a search operation mode is designated through a command input unit to drive a mounted CDG disc at a speed faster than a normal driving mode; Operating a CD player to intermittently decode the audio data provided from the CD deck, and provide a decoded voice signal to the speaker; Operating the CDG reproducing unit 14 to generate a video signal corresponding to the screen erased with a specific color and providing the generated video signal to the screen display unit; And displaying a screen corresponding to the video signal through a screen display unit. A compact disc having a control unit which controls a CD deck in response to a command applied through a command input unit, provides a voice signal decoded by the CD reproducing unit to the speaker, and provides a graphic signal decoded by the CDG reproducing unit to the screen display unit. In the graphic player, when the search operation mode is designated through the command input unit, the control unit generates a screen erasing signal and provides the screen erasing signal to the CDG reproducing unit. And a video signal corresponding to a color-erased screen is provided to the screen display unit.