KR0129581B1 - Cdg disc and reproducing apparatus thereof with super impose mode - Google Patents

Abstract

The superimposing CDG(Compact Disk Graphics) disk on which in a pack comprised of a plurality of symbols in channels R-W of a sub-code, modes and items are defined in at least one symbol and still image and subtitles are recorded in a predetermined number of symbols, is characterized in that mode-item codes of the subtitles is separately assigned to the modes and items defined in the at least one symbol to divide background and subtitles.

Description

Superimposable CDG (Compact Disk Graphios) discs and their playback devices

1 is a diagram showing one pack as a basic format unit of R to W channels of subcodes defined in a CDG disc.

2 is a diagram for explaining a defined combination of mode-items in a conventional CDG disc.

3 illustrates a defined combination of mode-items in a superimposable CDG disc according to the present invention.

4 is a diagram showing one pack as a basic format unit of R to W channels of a subcode corresponding to a background in a super-impossible CDG disc according to the present invention.

FIG. 5 is a diagram showing one pack as a basic format unit of R to W channels of a subcode corresponding to a subtitle in a super-impossible CDG disc according to the present invention.

6 is a block diagram of a super-impossible CDG disc reproducing apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

10: CDG decoder 12: synchronization separator

14: phase comparator 16: phase compensator

18: oscillator 20: RGB encoder

22: switching unit 24: mode setting unit

26: micom

The present invention relates to a superimposable compact disk graphics (CDG) disk and a playback apparatus thereof, and more particularly, to a superimposable compact disk graphics (CDG) disk on which a background image and a subtitle are separately recorded, and a subtitle. The present invention relates to a super-impossible CDG disc reproducing apparatus which is capable of being reproduced by being processed in superimposed form on an external video signal.

Currently, the analog audio signal is sampled at a sampling frequency of 44.1KHz, and the sampling result is converted into a digital signal combined with 1 and 0 by analog / digital conversion. Finally, the 'foot' corresponding to the information using laser cutting technology is used. Since compact discs (CDs) in which audio signals have been recorded by recording audio signals have been developed, such compact discs optically detect the shape of the pit and reproduce audio signals. Has the advantage of always having uniform hi-fi regeneration characteristics.

According to such a compact disc, a pit array of tracks defined as spirals or concentric circles is provided with a specific pit array at regular intervals, and a pit array that is present regularly includes a synchronization signal, from the synchronization signal to a subsequent synchronization signal. The blocks form a frame. Each frame contains a subcode containing control information and various service information starting from a synchronization signal (frame synchronization signal) indicating the head of the frame, and also includes an audio signal and an error correction signal.

Eight channels of P / Q / R / S / T / U / V / W are formed in the subcode defined in each frame. Generally, in a compact disc (CD), songs using only P and Q channels are generally used. It is defined to display the number, index number, playback time of the song, cumulative time from the beginning of the program, presence or absence of an audio signal, and the like.

Recently, in consideration of the monotony of a CD capable of playing only an audio signal, a compact disc graphics (CDG) recording still picture data (graphic data) using R to W channels of a subcode while using the audio signal format of the CD as it is. And a CDG playback system for playing such CDGs, providing the same high quality hi-fi audio signal as the CD, and providing graphic background and subtitles through the display device. To meet the needs of consumers.

In general, the basic format of the R-W channel of the subcode is shown in FIG. 1, where each group of 6 bits of the R-W channel is called a symbol (SYMBOL), and 24 symbol groups are packed in one pack. ) To form a unit. In one pack, the zeroth symbol contains a 3-bit mode and a 3-bit item defined in the form shown in FIG. 2, with the defined combination of mode-items as shown in FIG. In one pack, ROW data and COLUMN data are recorded in the sixth and seventh symbols, respectively, and one font (6 bits) is included in the eighth to nineteenth symbols. X12 columns) data is recorded.

By the way, when the data for practicing the subtitle is recorded on the CDG disc, for example, while displaying a still image in the background, the subtitle part is separated from the CDG disc as the subtitle part and the background part are recorded. Playback is impossible.

That is, in the CDG disc, the subtitle data is inserted at a predetermined position on the background screen to form a scene, so that during playback, only the subtitle portion recorded on the CDG disc is extracted because the background image and the subtitle are simultaneously processed and displayed on the screen. Therefore, it is not proposed to use it in combination with an external background.

Therefore, CDG discs have advantages over CDs in that the background images and subtitles are properly synthesized and displayed. However, since CDG discs are still pictures, they do not provide life. In this regard, there is an urgent need to propose a method of extracting only a subtitle portion of a CDG disc and synthesizing it with a dynamic external background, for example.

In contrast, in recent years, superimposed CDG discs capable of superimposing subtitles on an external input video signal of a moving picture and a playback device for reproducing the disc have been developed. Since the CDG disc is only for reproduction, the reproduction device has a disadvantage in that a general CDG disc cannot be reproduced.

Accordingly, the present invention has been made in view of the above-described circumstances, and a new mode-item code for a subtitle font is provided so that a background image and a subtitle portion are separately recorded in a general CDG format, so that only the subtitle portion can be reproduced. It is an object of the present invention to provide a recorded superimposable CDG disc and its playback apparatus.

According to a preferred embodiment of the superimposable CDG disc according to the present invention for achieving the above object, at least one symbol of the plurality of symbols is included in a pack made up of a plurality of symbols in the R to W channels of the subcode. In a CDG disc defined with a mode and an item and a still picture and a subtitle are recorded in a predetermined number of the plurality of symbols, a background and a subtitle are distinguished for a mode-item defined in at least one symbol of each pack. For this purpose, a superimposable CDG disc is provided with a defined subtitle mode-item code.

Further, according to the present invention, a mode-item code of a subtitle is divided to distinguish a background from a subtitle for a mode-item defined in at least one symbol in a pack composed of a plurality of symbols in R to W channels of a subcode. A mode setting unit for setting a superimpose mode of the CDG disc separately defined and defined for the microcomputer, and detecting a mode-item code of the CDG disc of the subtitles when setting the super emoticons mode to detect the superimpose control signal of the subtitles. In addition, the subtitle font is decoded based on the horizontal / vertical synchronization signal from the external video signal to which the subtitle is superimposed and the internal horizontal synchronization signal based on the detected phase difference compensation. CDG decoder for generating caption graphic information, and an RGB encoder for encoding R, G, and B color signals for caption graphic information applied from the CDG decoder. And a switching unit for switching the caption graphic video signal from the RGB encoder and the external video signal at a high speed according to the caption superimposition control signal from the CDG decoder at high speed to provide a superimposed CDG disc reproducing apparatus. do.

Here, the CDG decoder outputs a control signal of the first level continuously under the control of the microcomputer when the CDG mode is set so that the background / subtitle of the CDG disc is switched by the switching unit, whereas the superimpose When the mode is set, the first level control signal and the second level control signal which is the reverse level of the first level for the subtitle superimposition only when the subtitle is analyzed by analyzing the mode-item of the subcode input under the control of the microcomputer. The superimposition control signal is output.

According to the super-impossible CDG disc and the playback apparatus according to the present invention configured as described above, the CDG disc has a mode such that a background and a subtitle can be distinguished from the first symbol of a predetermined pack constituting the R to W channels of the subcode. -The item code is assigned and recorded, and the CDG player can interpret the mode-item code to distinguish whether it is a background or a subtitle. Therefore, based on whether the user sets the CDG mode or the superimpose mode, only the graphic video signal from the RGB encoder is selected and outputted, or the external video signal and the graphic signal from the RGB encoder are switched at high speed so that the super It can be imposed.

Hereinafter, with reference to the accompanying drawings will be described in detail a superimposable CDG disc and its playback apparatus according to the present invention.

3 is a view for explaining a defined combination of mode-items in a super-impossible CDG disc according to the present invention, in which the mode is 2 (010) and the item is 0, for example, as compared to the conventional example shown in FIG. Superimpose mode (000) is further defined and equipped.

FIG. 4 is a diagram showing one pack as a basic format unit of R to W channels of a subcode corresponding to a background of a superimposable CDG disc according to the present invention, and the first symbol is defined in FIG. Similarly, the mode-item is in line graphic mode. The configuration of the pack in FIG. 4 indicates that the font corresponding to the row and column of the screen is a background image in the line graphic mode.

5 is a diagram showing one pack as a basic format unit of R to W channels of subcodes corresponding to subtitles in a superimposable CDG disc according to the present invention. The mode is super as shown in the first symbol. It is in pose mode. Such a pack indicates that the font corresponding to the row and column defining the position of the subtitle positioned on the screen is the subtitle screen in the superimpose mode.

By recording the graphic image data on the CDG disc in the above manner, the background image and the subtitle image can be easily separated as necessary. That is, since the mode-item code can be identified and classified by the decoder of the CDG playback apparatus, only subtitle images can be extracted as necessary.

Next, a CDG disc reproducing apparatus for reproducing the CDG disc recorded as described above will be described in detail with reference to FIG.

6 is a block diagram of a super-impossible CDG disc reproducing apparatus according to the present invention. In the figure, reference numeral 12 denotes a synchronous separator which extracts and separates an external horizontal synchronous signal and an external vertical synchronous signal from an external video signal provided from an external video source such as a television or a video tape recorder, and 10 is read from a CDG disc. Control signal indicating the case of the superimpose mode in which the sub code is decoded and the background and subtitles of the CDG disc are recorded separately, and the unit of MAC of the background and subtitles (that is, the background font and the subtitle font of FIGS. 4 and 5) A CDG decoder which provides a complex synchronization signal by performing decoding processing, and 14 denotes a phase difference by comparing phases of an external horizontal synchronization signal from the synchronization separator 12 and an internal horizontal synchronization signal from the CDG decoder 10. Is a phase comparator for outputting the signal, and 16 is a phase compensator for controlling the following oscillator to compensate for the phase difference from the phase comparator 14. An oscillation unit for oscillating a source clock of the internal horizontal synchronization signal of the CDG decoder 10, where 20 is a complex synchronization from the CDG decoder 10; An RGB encoder that encodes R, G, and B color signals of graphic information (ie, background and caption or caption only information) applied from the CDG decoder 10 on the basis of a signal into a graphic image signal for screen display. Selects a graphic video signal (ie, background and subtitles) from the RGB encoder 20 according to a control signal from the CDG decoder 10, or an external video signal and a graphic signal from the RGB encoder 10 ( In this case, it is a switching unit for superimposing by switching the subtitles at high speed.

Reference numeral 24 denotes a mode setting unit for setting a superimpose mode that superimposes an external video signal input by extracting only a CDG mode and a caption image and outputting a video by implementing a background and a subtitle as a graphic image. The microcomputer controls the CDG decoder 10 in accordance with the setting mode of the mode setting unit 24.

In addition, when the CDG mode is set in the mode setting unit 24, the CDG decoder 10 continuously transmits a control signal of a first level (for example, a high level) to the switching unit 22 under the control of the microcomputer 26. By outputting, the switching unit 22 selects and outputs only the graphic image signal from the RGB encoder 20. When the superimpose mode is set in the mode setting unit 24, the CDG decoder 10 interprets the mode-item of the subcode input under the control of the microcomputer 26 to display the first subtitle only when the caption is a subtitle. Outputs a control signal of a level (e.g. a high level) such that the switching section 22 selects an output signal from the RGB encoder 20, while the first level is not subtitled (i.e., background). And the switching unit 22 selects the external video signal input by outputting a control signal of a second level (for example, a low level) which is a reverse level, so that the switching unit 22 receives the RGB encoder 20 from the RGB encoder 20. The subtitle video signal and the external video signal are switched at high speed so as to be superimposed.

Referring to the operation of the super-impossible CDG disc and the playback apparatus according to the present invention configured as described above are as follows.

First, when the CDG mode for reproducing a CDG having a general format is set by the mode setting unit 24, the microcomputer 26 notifies the CDG decoder 10 that the current CDG mode is set. The decoder 10 determines a CDG having a general format according to the command of the microcomputer 26 (i.e., mode and item determination; see line graphic mode in FIG. 3). In addition to continuously outputting to (22), the font recorded in the eighth to nineteenth symbols is decoded (in this case, the background and the subtitle are combined) and applied to the RGB encoder 20. Then, the RGB encoder 20 encodes the graphic video signal into a graphic video signal for display on the screen and outputs the graphic video signal to the switching unit 22. Accordingly, the switching unit 22 transmits the CDG encoder 10. Switching is controlled by a high level control signal from the RGB encoder 20 so as to select and output only the graphic video signal from the RGB encoder 20, thereby producing a general CDG video output.

Next, when the superimpose mode is set by the mode setting unit 24, the microcomputer 26 sets the CDG decoder 10, the sync separator 12, the phase comparator 14, the phase compensator 16, and the like. The oscillator 18 is notified that the CDG superimpose mode is currently set.

Accordingly, the synchronization separator 10 extracts and separates an external horizontal synchronous signal and an external vertical synchronous signal from an external video signal provided from an external video source such as a television or a video tape recorder. The external vertical synchronous signal is a CDG decoder. The CRT controller is inputted to an unshown CRT controller terminal provided in (10) to reset the CRT controller, and the external horizontal synchronizer signal is input to the phase comparator 14.

The CDG decoder 10 outputs an internal horizontal synchronizing signal generated by, for example, dividing the clock signal input from the oscillator 18 by 910 to the phase comparator 14, and the phase comparator 14 The phase of the external horizontal synchronizing signal and the internal horizontal synchronizing signal are compared to detect and output the phase difference, and the phase compensator 16 outputs the phase compensation signal to the oscillator 18 based on the phase difference. Therefore, the oscillator 18 oscillates a source clock (14,31818 MHz) of the internal horizontal synchronization signal whose phase error is accurately compensated for according to the phase compensation signal.

The CDG decoder 10 decodes the mode-item defined in the first symbol on the CDG disc to be reproduced to check the superimpose mode (subtitle in this case). As the font recorded in the symbol is synthesized with the oscillation frequency and the internal vertical synchronization signal, and applied to the RGB encoder 20 as a composite synchronization signal, the RGB encoder 20 outputs the result of decoding from the CDG decoder 10. The R, G, and B color signals for the information are encoded based on the composite synchronization signal.

On the other hand, under the control of the microcomputer 26, the CDG decoder 10 interprets the mode-item of the currently input subcode to reproduce the pack in which the subtitle is recorded (especially a row of the pack in which the subtitle is recorded). And at a position designated in the column COLUMN) to output a high level control signal to the switching unit 22, for example, so that the switching unit 22 is switched to the RGB encoder 20 so that the caption data is switched out. On the other hand, in the case of non-subtitle (that is, not the position of the subtitle), for example, a low level control signal is output so that the switching unit 22 switches to the external video signal input side. Accordingly, the switching unit 22 outputs a video signal superimposed on the external video signal input by selecting only the caption video signal from the RGB encoder 20.

As described above, according to the present invention, the CDG disc is recorded by giving a mode-item code to the first symbol of the predetermined pack constituting the R to W channels of the subcode so as to distinguish the background and the subtitle. The disc player can interpret the mode-item code to distinguish whether it is a background or subtitle. Therefore, only the graphic image signal from the RGB encoder is selected based on whether the user sets the CDG mode or the superimpose mode. It is possible to output or superimpose by switching the external video signal and the graphic signal from the RGB encoder at high speed, and as a background, the user can select a still picture or a moving picture of an external video input according to his / her preference. .

Claims (3)

CDG disc in which a mode and an item are defined in at least one of the plurality of symbols and a still picture and a subtitle are recorded in a predetermined number of the plurality of symbols in a pack formed by a plurality of symbols in the R to W channels of the subcode. The superimposable CDG disc according to claim 1, wherein a mode-item code of subtitles is defined separately for a mode-item defined in at least one symbol of each pack to distinguish between a background and a subtitle. CDG disc defined by subtitle mode-item code separately to distinguish background and subtitles for mode-item defined in at least one symbol in pack composed of multiple symbols in R ~ W channel of subcode A mode setting unit 24 for setting the superimpose mode of the subtitle 26 to the microcomputer 26, and detecting a mode-item code of the CDG disc of the subtitles when the superimpose mode is set. In addition, the subtitle font is decoded based on the horizontal / vertical synchronization signal and the horizontal horizontal synchronization signal from the external video signal to which the subtitle is superimposed and the internal horizontal synchronization signal by the detected phase difference compensation. CDG decoder 10 for generating caption graphic information, RGB encoder 20 for encoding R, G, and B color signals for caption graphic information applied from the CDG decoder 10, and the CDG. And a switching unit 22 for superimposing by switching the caption graphic video signal and the external video signal from the RGB encoder 20 at high speed according to the caption superimposition control signal from the coder 10. Superimposable CDG disc player. The background / subtitle switching unit 22 of claim 2, wherein the CDG decoder 10 continuously outputs a first level control signal under the control of the microcomputer 26 when the CDG mode is set. On the other hand, when the superimpose mode is set, the mode-item of the subcode input under the control of the microcomputer 26 is interpreted to control the first level for the subtitle superimpose only when the subtitle is subtitled only. And a control signal (superimposition control signal) of a second level, which is a reverse level of the first level thereof.