KR0164183B1 - A controlling method for background screen of video compact disc player - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a method for controlling the background display of a video compact disc player in which a background image can be viewed more precisely by displaying a background image of a high quality still picture when the initial playing or ending of the optical disc is made.

To this end, the present invention reads out a stream recognition code of information corresponding to the current playback state at the time of initial playback or at the end of playback of an optical disc on which predetermined data is recorded based on the MPEG system, and reads the read stream identification code. When the read signal is a signal for designating a still image having a high resolution, the image is set to a high resolution still image mode so that a still image display operation in the set mode is performed, while the read signal is a still image having a normal resolution. In the case of a signal for specifying a still picture mode in normal resolution, the still picture display operation in the set mode is performed, and the read signal is not a signal specifying a still picture in high resolution and normal resolution. Is to be displayed on the screen being played back. The signal representing the still image mode of resolution is precoded in the optical disc manufacturing step.

Description

How to control the background display of video compact disc player

Fig. 1 is a diagram showing a sector layout of recording data on a video compact disc as an MPEG type information recording medium.

FIG. 2 is a diagram showing the configuration of the user data area of FIG.

3 is a block diagram of a background screen display control apparatus of a video compact disc player employed in the present invention.

4 is a diagram showing an example of information stored in a buffer shown in FIG.

FIG. 5 is a diagram showing the internal structure of the ROM shown in FIG.

6 is a flowchart illustrating a method for controlling a background screen display of a video compact disc player according to the present invention.

* Explanation of symbols for main parts of the drawings

10: control function setting section 12: CD-microcom

14: servo control unit 16: spindle motor drive unit

17: spindle motor 20: optical pickup drive unit

22: optical pickup 24: RF amplifier

26: CD-DSP 28: CD-ROM Decoder

30: MPEG-Microcomputer 32: Buffer

34: ROM 36: MPEG video / audio decoder

38: Digital / Analog Converter (DAC) 40: RGB Encoder

42: digital / analog converter (DAC)

The present invention relates to a method for controlling a background screen display of a video compact disc player. More particularly, the present invention relates to a video screen capable of converting a high-quality still picture (for example, an initial screen, a help screen, etc.) into an optical disc during playback. A background image display control method for a compact disc player.

Recently, an information recording medium for recording audio / video data using an MPEG (Motion Picture Expert Group) method such as a video compact disc (VCD) has attracted attention as a next generation audio / video information recording medium.

The MPEG is an international standard drafted by experts from ISO / IEC and Joint Technical Committee (JTC) formed by the international standardization bodies ISO and IEC for the compression encoding of digital video, which is the core technology in the multimedia environment. The 12-cm diameter compact disc allows you to watch approximately 74 minutes of video.

Here, the MPEG refers only to moving images in terms of the term itself, but also defines a standard for digital voice compression and a standard for a system in which a voice / video is mixed in a packetized structure.

As shown in FIG. 1, the sector layout of the recording data of the video compact disc includes the synchronization signal data (Sync) and the header information data, the subheader indicating the attribute of the sector, the user data, and the error detection code (EDC). Consists of

As shown in FIG. 2, the user data area includes an ISO 11172 layer including a plurality of packs, each pack layer including a system clock reference (SCR), a system header, It consists of a number of packets.

In the system clock reference, the time reference point of the pack is indicated as the number of clocks, and each packet includes a packet start code, a stream recognition code, a packet length, header data, and corresponding packet data. The data includes a decoding time stamp (DTS; Decorating Time Stamp; indicated by the number of reference clocks) and a display time stamp (PTS; Presentation Time Stamp; indicated by the number of reference clocks) indicating the decoding time. have.

In the video compact disc player for playing the recorded video compact disc as described above, the MPEG decoder is configured to decode the packet data based on the control data (eg, SCR, DTS, PTS, etc.).

In the video compact disc player that outputs video / still image and sound based on the decoded data as described above, a background image indicating the current state is displayed during the initial or end of the playback operation on the optical disc. When the text information and / or the picture indicating the operation or the end is displayed together, and the superimposing the text information on the background or the superimposing the fine picture, the picture quality is not clear at the normal resolution. Had a problem.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide a video compact disc for displaying a more precise background image by displaying a background image of a high quality still picture upon initial playback or end of playback of the optical disc. The present invention provides a method for controlling a player's background screen display.

According to a preferred embodiment of the present invention for achieving the above object, a stream recognition code of information corresponding to the current playback state is read at the time of initial reproduction or termination of an optical disc on which predetermined data is recorded based on the MPEG method. A first step to take, a second step of reading the read stream recognition code, and a still picture display operation to a mode set to a high resolution still picture mode if the read signal is a signal specifying a high resolution still picture On the other hand, in the case where the read signal is a signal specifying a still picture of normal resolution, a still picture display operation in the set mode is performed by setting to a still picture mode of normal resolution. If the signal is not a signal that specifies a high resolution and normal resolution still image, it is currently playing. Is configured to display in a screen state, and a signal representing the high-resolution still picture mode is provided with a method for controlling a background screen display of a video compact disc player pre-coded in an optical disc manufacturing step.

According to the present invention as described above, the stream recognition code of the address information in the ROM, which indicates the current playback state at the time of initial playback or at the end of playback of the optical disc on which predetermined data is recorded by the MPEG algorithm, means a high resolution still picture mode. In the case of a signal, a high resolution still image is displayed, and in the case of a signal indicating a normal resolution still image mode, a normal resolution still image is displayed, and a signal that does not mean the high resolution and normal resolution still image mode. In this case, the current screen mode is displayed.

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

3 is a block diagram of a background screen display control apparatus for a video compact disc player employed in the present invention. The apparatus employed in the present invention includes a control function setting unit 10, a CD-microcomputer 12, and a servo control unit 14. ), Spindle motor driver 16, spindle motor 18, optical pickup driver 20, optical pickup 22, RF amplifier 24, CD-DSP 26, CD-ROM decoder 28, MPEG-microcomputer 30, buffer 32, ROM 34, MPEG video / audio decoder 36, digital / analog converter 38, RGB encoder 40, digital / analog converter 42 Include.

The control function setting unit 10 may selectively input a function assigned to the optical disc reproducing apparatus with a plurality of operation command keys.

The CD-microcom 12 reproduces the spindle servo, the focusing / tracking servo, and the information reproduction for information reproduction on the optical disc D as the information recording medium based on the function or mode set by the control function setting unit 10. Perform overall functional control of the process.

The servo controller 14 servo-controls the spindle motor 18 which drives the optical disc D at constant speed through the spindle motor driver 16 in response to the servo control of the CD-microcomputer 12. The focusing / tracking servo of the optical pickup 22 as the laser information reading means is controlled by the driving unit 20.

The RF amplifier 24 amplifies the RF signal read from the optical disc D by the optical pickup 22.

The CD-DSP 26 processes the data amplified by the RF amplifier 24 into a serial data stream. When the optical disc D is a CD or CDG, the CD-DSP is processed. Digital processing at 26 causes subsequent processing by the CD / CDG processing means (not shown) to enable playback.

The CD-ROM decoder 28 decodes the data output from the CD-DSP 26, extracts the data in sectors, and outputs the MPEG data and the control data separately.

The MPEG microcomputer 30 receives the control data output from the CD-ROM decoder 28 by interaction with the CD microcomputer 12 and then describes an MPEG video / audio decoder described later based on the control data. A control signal for the decoding operation at 36 is outputted.

The buffer 32 stores an address for a background screen (for example, an initial screen, a help screen, a karaoke screen, and the like) (see FIG. 4).

The ROM 34 stores a resolution mode (e.g., a high resolution still image mode, a low resolution still image mode) of a background image corresponding to each address of the buffer 32, and data for reproduction processing (e.g., a moving image and an audio). (See Figure 5).

Meanwhile, in the embodiment of the present invention, the buffer 32 and the ROM 34 are separately configured, but may be configured as a single memory device.

The MPEG video / audio decoder 36 decodes the MPEG data output from the CD-ROM decoder 28 in accordance with a video sync clock and an audio sync clock.

The digital / analog converter (DAC) 38 converts the digital video data output from the MPEG video / audio decoder 36 into analog.

The RGB encoder 40 converts the video signal converted by the digital / analog converter 38 into a composite video signal having color signals of R, G, and B and outputs the converted video signal.

The digital / analog converter 42 converts the digital audio data output from the MPEG video / audio decoder 36 into an analog voice signal and outputs the converted audio signal.

According to the general reproducing operation of the video compact disc player configured as described above, when the user first turns on the play button on the control function setting unit 10, the CD-microcom 12 controls the servo circuit unit 14. The spindle motor driver 16 rotates the spindle motor 18 at constant speed under the control of the servo circuit unit 14, and then the optical pickup 22 via the optical pickup driver 20 under the control of the servo circuit unit 14. ) Reads data on an optical disc (e.g., Video CD; D) in which predetermined data is recorded according to the MPEG algorithm.

The read data are amplified by the RF amplifier 24, signal-processed in the form of a serial data stream by the CD-DSP 26, and separated into MPEG data and control data by the CD-ROM decoder 28, respectively. Since it is applied to the MPEG microcomputer 30 and the MPEG video / audio decoder 36, the MPEG video / audio 36 is controlled by the MPEG microcomputer 30 and the MPEG data from the CD-ROM decoder 28. Are decoded according to the video synchronous clock and the audio synchronous clock and output as video signals and digital audio data, respectively. The output video signal is added to the R, G and B color signals by the RGB encoder 40 via the digital / analog converter 38 and displayed on the video display device (e.g., CRT) as a composite video signal. The digital audio data output is converted into an analog audio signal by the digital / analog converter 42 and then output through an audio output device (eg, a speaker).

Next, a method of controlling a background screen display of a video compact disc player according to the present invention will be described based on the flowchart of FIG.

In the description of the embodiment of the present invention, the initial reproducing operation of the optical disc D will be described as an example.

Once the user sets the playback mode using the control function setting section 10, data transfer is performed for data playback on the optical disc D (step 60). In this case, a predetermined character is synthesized and displayed on an initial screen such as, for example, a blue screen until a certain playback time has elapsed. In this case, the CD-microcom 12 has an initial screen stored in the buffer 32. The information (signal containing the stream recognition code) of the corresponding address of the ROM 34 is read using the address corresponding to (step 61).

Then, the CD-microcomputer 12 reads out the stream identification code indicating the resolution mode from the information of the address (step 62). If the read stream recognition code is 0xE2, for example, it is determined that the still picture mode of the high resolution is currently set, and then the decoding operation of the MPEG video / audio decoder 36 is performed through the MPEG microcomputer 30. A high resolution still picture mode is set (step 63). Accordingly, according to the decoding operation of the MPEG video / audio decoder 36, in the image output apparatus (for example, CRT; not shown), a screen corresponding to the set high resolution still image mode (for example, a screen of 704x480) is displayed. Is displayed (step 64).

On the other hand, when the read stream recognition code is 0xE1, for example, it is determined that the still picture mode of the current normal resolution is set, so that the MPEG video / audio decoder 36 enters the normal picture still picture mode. Is set (step 65x66). Accordingly, in accordance with the decoding operation of the MPEG video / audio decoder 36, the image output apparatus may display a screen corresponding to the set normal resolution still picture mode (for example, a screen of 352 × 240) similarly to the operation of step 64. Will be displayed.

When the read stream recognition code is other than the above-mentioned signal, the read stream recognition code is judged to be in a normal playback mode (that is, a state in which moving picture and audio are outputted according to data reproduction). Instead of displaying a still picture of normal resolution, a moving picture and an audio are output.

On the other hand, in the constant embodiment described only the initial playback operation of the optical disk (D), even if the playback of the optical disk (D) is finished, the above-described operation is applied to display a still image of a high resolution as a background screen Can be.

According to the present invention as described above, the stream recognition code of the address information in the ROM, which indicates the current playback state at the time of initial playback or at the end of playback of the optical disc on which predetermined data is recorded by the MPEG algorithm, provides a high resolution still picture mode. In the case of a signal indicating a high resolution still picture, a normal resolution still picture mode is displayed. In the case of a signal indicating a normal resolution still picture, a high resolution and normal resolution still picture mode signal is not indicated. In the case of being displayed in the currently playing screen mode, the user (viewer) can watch a more detailed and precise background screen.

Claims (1)

A first step of reading a stream recognition code of information corresponding to the current playback state at the time of initial reproduction or termination of reproduction of the optical disc on which the predetermined data is recorded on the basis of the MPEG method; and the step of reading the read stream recognition code. Step 2 and, if the read signal is a signal specifying a high resolution still picture, the image is set to a high resolution still picture mode so that a still picture display operation in the set mode is performed, while the read signal is normal resolution. In the case of a signal for specifying a still image of the still image, the image is set to a normal resolution still image mode so that a still image display operation in the set mode is performed, while the read signal specifies a still image having a high resolution and normal resolution. If not, it is composed of the third step to display the currently playing screen. And a signal representing the high resolution still picture mode is pre-coded in the optical disc manufacturing step.