JPH0345394B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for recording graphics commands, and in particular to a method for recording graphics commands, and in particular for recording the hue (color) of a color display image of a digital image signal reproduced together with a digital audio signal from a digital audio disk. This invention relates to a method for recording graphics commands for gradual switching.

2. Description of the Related Art Various types of digital audio disks have been proposed in the past, in which digital audio signals obtained by digitally modulating analog audio signals are recorded in a predetermined format. In addition to the digital audio signal and parity data for error correction, a disc (CD) has a data area called a subcode for control and display purposes, and a part of it is used for control purposes. The rest was empty space.

In 1985, a format for subcode data was developed to utilize this empty space to simultaneously play back high-fidelity music signals and display song titles, lyrics, explanations, and graphic images that match the image of the song. The decision was made in February. This is generally referred to as CD graphics, and compact discs that are used to display karaoke lyrics are on sale.

First, to explain the data format of this CD graphics, Fig. 6 shows the signal format of one frame of the digital signal recorded on the compact disc.
One symbol (=8 bits) of subcodes are synthesized in time series along with error correction parity.

FIG. 7 shows the structure of one data block of the subcode. The subcode consists of 8 bits,
Each bit is P, Q, R, S, T, U, V, W.
Each channel name is given. Subcode channels P and Q are used as time codes, etc., and the remaining subcode channels R to W are
Used as CD graphics. If the 8-bit subcode data shown in Figure 6 is one symbol, one data block of the subcode is the seventh
As shown in the figure, it is composed of 98 symbols, of which 96 symbols excluding the two symbols of subcode frame syncs S ₀ and S ₁ are called a packet. Further, one packet is divided into four parts, and each of the divided 24 symbols is called a pack, and one operation (command) is executed using this pack as a basic unit.

FIG. 8 shows the basic configuration of one pack. Two pieces of information, mode and item, are registered in symbol 0, and the mode indicates what purpose the pack is for. Currently, three modes are defined. Generally, two modes are used: mode "0" in which no valid data is transferred and mode "1" in which graphic data is transferred.
The item is an item that indicates the target display device, and currently it is a line display (item “0”).
and CRT display (item “1”).

Symbol 1 is an instruction symbol, which is basically divided into six types of instructions. In other words, preset memory (presets the video RAM in one color), preset border (presets the border area in one color), light font (writes data in two colors to the specified font), EXOR font ( Color number within the specified font
There are six types: EX-OR), load CLUT (sets the color lookup table), and soft scroll (soft scrolls the screen).

For symbols 2 and 3, correction parities Q ₀ and Q ₁ of symbols 0 and 1 are arranged. A total of 16 symbols, symbols 4 to 19, are data fields, and necessary data is given in a predetermined format according to the contents of the instruction. Furthermore, symbol 2
Correction parities P ₀ , P ₁ , P ₂ and P ₃ for symbols 0 to 19 are arranged at 0 to 23.

The above is an overview of the pack data structure, and the display of characters and graphic images is realized by combining various instruction packs. Each symbol data in a pack is recorded on the disk in an interleaved manner to prevent burst errors, but since this is not particularly relevant to the purpose of the present invention, its explanation will be omitted.

Next, the screen format of the display device will be explained. As mentioned above, there are two types of display devices: line displays and CRT displays.Since CRT displays have a large display area and can display full color, they are often used, so the screen format for CRT displays is different. I will explain about it.

Figure 9 shows the screen format for CRT, and the pixel configuration of the display area is 288 pixels in the horizontal direction and 192 pixels in the vertical direction.
Furthermore, if this is expressed as a font with a configuration of 6 pixels in the horizontal direction and 12 pixels in the vertical direction, it becomes 48 fonts in the horizontal direction and 16 fonts in the vertical direction. As can be seen from the pack configuration of the light font instruction shown in Figure 10, this font has a configuration of 6 pixels horizontally and 12 pixels vertically, which corresponds to a total of 12 symbols from symbols 8 to 19. Therefore, graphics display is performed using this font as a reference unit.

In Figure 10, symbol 1 "000110" indicates that the instructions in this pack are light fonts, and in this case, symbols 4 and 5 CH0 and CH1 indicate channel numbers, and symbols 4 and 5 indicate channel numbers. 4 bits each from T to W of
COLOR0 and COLOR1 indicate the background and foreground color numbers, and symbol 6's ROW indicates the vertical font position within the screen shown in Figure 9.
COLUMN each indicates the horizontal font position.

One font of data is arranged in symbols 8 to 19, a total of 12 symbols, and when the data of each bit is "1", the color number of the pixel in the corresponding font becomes COLOR1 of symbol 5. On the other hand, when the data is “0”, the color number of the pixel in the corresponding font is symbol 4.
COLOR becomes 0. Therefore, graphics display using the light font instruction has two colors within one font.

The above is an overview of the format related to the conventionally known subcode data R to W. Next, we will explain the conventional method of displaying lyrics on the screen and changing the color of the lyrics using the subcode data R to W. do.

FIG. 11 shows an example of pack combinations when lyrics are displayed on the screen and the colors of the lyrics are changed. The vertical direction in FIG. 11 indicates the time axis, each block indicates each pack, and the name inside indicates the instruction of that pack. In FIG. 11, screen initialization 1 is performed by sequentially transmitting the load CLUT, preset memory, and preset border packs, but screen initialization is limited to this method. It's not something you can do.
Next, as shown at 2 ₁ , 2 ₂ , etc. in FIG. Packs 3 ₁ , 3 ₂ , ..., "light font" packs 4 ₁ , 4 ₂ , ... on the 3rd line are transmitted, and finally, the last "light font" pack 5 on the x row is transmitted, and the lyrics are Display is performed.

Here, the "light font" pack that displays the lyrics (characters) in each line is 48 fonts per line as shown in Figure 9, so 48 font packs may be transmitted per line, but the background As for colors, the colors specified by the "preset memory" pack during screen initialization 1 will be displayed as they are even if the "light font" pack is not transmitted, so normally only the number of characters will be displayed. transmitted. Therefore, the number of "light font" packs transmitted will vary depending on the amount and complexity of the lyrics being displayed.

Furthermore, the "light font" pack is transmitted in the format shown in Figure 10, and since COLOR0 of symbol 4 is the background color of the characters, it is generally stored in the "preset memory" of screen initialization 1. Color number used in pack
C ₀ is used. Also, symbol 5 in Figure 10
COLOR1 is the color of the character itself; for example, C ₁ is used for packs 2 ₁ , 2 ₂ , etc. for displaying the first line, and C ₂ is used for packs 3 ₁ , 3 ₂ , etc. for displaying the second line. Different color numbers are used for each line (or phrase).

Furthermore, ROW of symbol 6 and COLUMN of symbol 7 in FIG. 10 are given font coordinate values according to the desired display order depending on the size of the characters, whether the lyrics are written vertically or horizontally, etc. In this way, the lyrics are displayed on the screen by combining several pieces of music.

After this, according to the flow of music, for a certain period shown as 6 in FIG. 11, the mode 0 pack is transmitted, and then the "load CLUT" pack 7 is transmitted, and in the same way, the mode 0 packs 8 and 7 are transmitted. The "Load CLUT" pack 9, the mode 0 pack 10, the "load CLUT" pack 11, and the mode 0 pack 12 are transmitted in this order, and the color of the displayed lyrics changes each time the "load CLUT" pack is transmitted.

That is, if the color lookup table (CLUT) is as shown in Figure 12,
0 at screen initialization 1 in Figure 11
By reproducing the th "Load CLUT" pack, the color number C ₀ becomes R, as shown by 0 in Figure 12.
(red), G (green) and B (blue) values are all “0”
Therefore, C ₀ is black, and other color numbers
Since the values of R, G, and B of C ₁ to C ₁₅ are all "15", they become white. As a result, as described above, the lyrics from the first line to the xth line are displayed in white characters against a black background color.

Next, by playing the first "Load CLUT" pack shown at 7 in FIG. 11 after the above lyric display is finished, the R, G of the color number C ₁ in the first row is displayed as shown at 1 in FIG. 12. , B value is "15, 0, 0", and the other color number values are the same as when they were 0, so only the lyrics in the first line change from white to red, and the lyrics in other lines change to white characters. It will remain as . Thereafter, in the same way, when the "Load CLUT" pack 9 in Figure 11 is played back, as can be seen from 2 in Figure 12, only the lyrics in the second line change from white to red, and the lyrics in the first line change to The color changes from red to white, and then the first
As can be seen from 3 in Figure 2, only the lyrics on the third line switch from white to red, and the lyrics on the second line switch from red to white.

Still another color changing method is to repaint the already displayed lyrics with another color. In other words, basically the pack combination used when first displaying is used, but by retransferring the "light font" pack with only the color number of COLOR1 set to a different color number, the first display The lyrics can be displayed in a different color than the original color, and the lyrics can be changed in color.

Problems to be Solved by the Invention However, in the former color changing method, in which colors are changed by transferring a "load CLUT" pack, the minimum unit of color change is a phrase, which is large, and the "light font" pack is difficult to change. In the latter color change method, which performs color change by retransferring, although the minimum unit of color change is smaller than the font size compared to the former method, it is difficult to change colors smoothly, so in practice, it is difficult to change colors smoothly. The colors are changed by row. Therefore, in the past, there was a problem in that it was not possible to smoothly change colors in synchronization with the flow of music, such as on a video disc.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a method for recording graphics commands that makes it possible to change the colors of display images such as lyrics and musical scores in an analog manner in synchronization with music. do.

Means for Solving the Problems The method for recording graphics commands of the present invention is to record pixel color codes in a plurality of pixel widths, and to gradually change pixel color codes of one color to another in a certain direction of a displayed image. The graphics command to be changed is recorded intermittently or continuously in synchronization with the modulated audio signal of the digital audio signal.

Function: The digital image signal reproduced from the recording medium is displayed as a color display image pixel by pixel in colors based on the pixel color code of the reproduction graphics command. Here, the above graphics command continuously or intermittently changes the pixel color code to the pixel color code of another color in a plurality of pixel widths in synchronization with the playback audio signal. The color of the displayed image changes continuously or intermittently in units of a plurality of pixel widths in a fixed direction in synchronization with the reproduced audio signal.

Examples FIG. 1 shows examples of color changing according to the method of the present invention. Figures A and B show examples of color changing according to the data contents of the data field in the "EXOR font" pack as an example of a graphics command. This “EXOR font” pack is
The only difference is that the instruction part of symbol 1 of the “Lightfont” pack has been changed from “000110” to “100110”; other than that, the structure is the same as that of the “Lightfont” pack, but the effect is The pixel corresponding to the “0” part in the data field is the current color number and COLOR.
The color number is rewritten by EXOR (exclusive OR) with the color number indicated by 0, and the pixel corresponding to the "1" part in the data field is rewritten by EXOR of the color number indicated by COLOR1 and the current color number. This is a graphics command that rewrites to color numbers.

In the present invention, the procedure up to displaying a display image (for example, lyrics) on the screen is the same as before, by transferring the "Light Font" pack, but changing the color of the image after displaying the image is done using the "EXOR Font" pack described above. use Here, the display format of lyrics as an example of a display image varies depending on the combination of height, width, character size, etc., but here, first, the case of one character with a font size of 6 pixels horizontally and 12 pixels vertically. I will explain about it. Figure 1A is an example of one character in a vertically written character string.The color code (color number) of each pixel of 6 pixels horizontally and 12 pixels vertically that constitutes one character is first created using the "EXOR font" pack. Among the 6 pixels of symbol number 8 shown below, the color code of a plurality of pixels related to characters is changed to the pixel color code of one desired color, and among the 6 pixels of symbol number 9 shown below, the color code of a plurality of pixels related to characters is changed. The color code of the pixel is changed to the pixel color code of the desired color, and the symbol number →
Change the pixel color code in the order of →…→. The “EXOR font” pack is recorded on the recording medium (compact disk) continuously or intermittently 12 times in total.

As a result, in the case of a vertically written character string, the colors can be sequentially changed from top to bottom. Furthermore, since this color change is recorded in the above-mentioned "EXOR font" pack in synchronization with the modulated audio signal of the digital audio signal recorded on the compact disk, the color change of the displayed image is performed in synchronization with the reproduced audio signal.

Figure 2 shows the method of the present invention shown in Figure 1A.
A pixel indicated by a white circle is displayed in the first color based on the color number (color code) C ₀ , and a pixel is displayed in the second color based on the color number C ₁ ×
The pixels indicated by the black circle up to the third line (third pixel from the top) of the character consisting of the pixels indicated by the mark are rewritten to the third color based on the color numbers C ₁ to C ₂ , An example of a character structure during color change is shown.

On the other hand, in the case of a horizontally written character string, as shown in Figure 1B, the pixel color number of the pixel related to the character among the 12 pixels in total, including the first leftmost bit (bit number R) shown in Figure 1B. is changed to another color pixel color number by recording the “EXOR font” pack. Hereinafter, in the same manner as shown in Figure 1B, S→T→U→V→W
Since an "EXOR font" pack is recorded that sequentially changes the pixel color numbers of pixels related to characters in the order of It will be held in

The recording operation for the above-mentioned color change according to the present invention will be explained in more detail with reference to FIGS. 4 and 5.
Now, assume that the number "1" is displayed as 15-0 in Figure 4A using 6 pixels horizontally and 12 vertically, and the color number of the background color is
Assume that C ₀ , the color number of the font color is C ₁ , and the font color is changed to C ₂ . In this case, the mode 0 pack is synchronized with the music signal flow.
It is recorded as shown at 16-1 in Figure B, and at a predetermined timing, the "EXOR font" is recorded as shown in Figure B.
Pack 17-1 is recorded.

This "EXOR font" pack 17-1 is a graphics command for changing the color of the pixels involved in character display on the first line of the character image 15-0, and its data structure is shown in Figure 3A. shows. In Figure 3A, pack 17-1
Symbol 1 "100110" is this pack 17-1
This indicates that the instruction is an EXOR font, the data of COLOR0 of symbol 4 is "0000", the data of COLOR1 of symbol 5 is "C 1 C 2", and furthermore, the data of COLOR 0 of symbol 4 is "C ₁ C ₂ ", and
Of the 1 font data of 12 symbols of 9,
Two bits, T and U, of symbol 8, which are the data bits corresponding to the pixels involved in character display on the first line of character image 15-0, are "1", and all other bits are "0". has been done.

By reproducing the thus recorded "EXOR font" pack _17-1 having the data structure shown in FIG.
It will be displayed in a color based on the color number of _{C 2 (} =C ₁ (C ₁ C ₂ )), which is the exclusive OR with the color number C 1 C ₂ of symbol 5.
For other pixels, the background color part is C ₀ = (=C ₀
0), the characters on lines other than the first line are
C ₁ (=C ₁ 0), and the initial character image 15-0
remains the same.

Therefore, by reproducing the pack 17-1, the displayed image becomes as shown schematically at 15-1 in FIG. ₂ , and the pixels of the character part of the lines other than the first line indicated by the x mark are the initial character image 15-
Same color number as the pixel in the 0 character part
Displayed in C ₁ color.

Next, after a pack of instructions in mode 0 is recorded for a certain period of time as shown at 16-2 in FIG. 4B, an "EXOR font" pack 17-2 is recorded at a predetermined timing as shown in FIG. 4B. be done. This "EXOR font" pack 17-2 is a graphics command for changing the color of the pixels involved in the second line character display of the character image 15-1, and its data structure is shown in Figure 3B. show.

“EXOR font” pack 1 shown in Figure 3B
Pack 7-2 has almost the same data structure as the "EXOR font" pack 17-1 shown in FIG. S of symbol 9, which is a data bit involved in the character display of
It differs from pack 17-1 in that three bits of T and U are "1" and all other bits are "0".

As a result, as can be clearly inferred from the above explanation, this “EXOR font” is used during playback.
By reproducing pack 17-2, pixels in the character part of the second line will be displayed in a color based on the color number of C ₂ (=C ₁ (C ₁ C ₂ )), and other pixels will be displayed in the background color. The part is C ₀ (=C ₀
0), the character part after the third line is C ₁ (=C ₁
0), the character part of the first line is C ₂ (=C ₂ 0)
The character image 15-1 is displayed in the same color number as the character image 15-1.

Therefore, by reproducing the pack 17-2, the displayed image becomes as shown schematically at 15-2 in FIG. color number
The pixels of the character part from the 3rd line to the 12th line indicated by the cross mark are displayed in the color of C ₂ , and the pixels of the character part of the initial character image 15-0 are the same as the color number C ₁ . Displayed in color.

Thereafter, after an appropriate number of instruction packs in mode 0 are recorded in synchronization with the progression of the music signal as shown at 16-3 in FIG. 4B, the characters on the third line of character image 15-2 are recorded. An "EXOR font" pack 17-3 is recorded for changing the color of the pixels involved in the display. Therefore, during playback, the display image changes to the fourth image by playing back this “EXOR font” pack 17-3.
As schematically shown at 15-3 in FIG. A, the pixels of the character portion of the first to third lines shown in black are displayed in the color of the desired color number _C2 .

Thereafter, similarly, recording of an appropriate number of mode 0 instruction packs and recording of "EXOR font" packs for changing the color of pixels in a predetermined line of characters are alternately repeated. As a result, when this compact disc is played back, the color of the pixels in the text area changes line by line in synchronization with the music, from top to bottom, from the first color with color number C ₁ to the second color with color number C ₂ . By playing back the 12th "EXOR font" pack 17-12 shown in FIG. 4B, the character images are changed to all the characters as schematically shown in FIG. 4A. The pixels in the section switch to a second color with the desired color number _C2 .

FIG. 3C shows the data structure of the pack 17-12, in which the 4 bits S, T, U, and V of symbol 19, which are involved in character display on the 12th line, are "1".
All other bits of symbols 8 to 19 are "0", and as a result, only the pixels in the character part of the 12th line switch to the color number C2, and the pixels in the other image parts change to the color number _C2 . The previous color will be retained. In addition, the above pack 1
After recording 7-12, the pack of instructions in mode 0 is shown as 16-13 in Figure 4B.
It will be recorded until the next color change is started. When a compact disc recorded using this recording method is played back, the color of the character image 15-0 is smoothly switched from top to bottom in synchronization with the music, from character image 15-12 to character image 15-12.

Note that although the above explanation was for the case where one character is composed of one font, the present invention can be similarly applied to the case where one character is composed of a plurality of fonts. can. Figure 5A,
For B, each character has 24 pixels horizontally and 24 pixels vertically, totaling 8.
As an example of a case where characters are composed of 8 fonts (F1 to F8), the color change when a character consisting of these 8 fonts is displayed vertically is as shown in Figure 5A. The 6 pixels of the line are first changed in color by recording and reproducing the "EXOR font" pack, and then the 6 pixels of the first line of font F2 are changed to "EXOR font".
The colors are changed by recording and reproducing the pack, and the 6 pixels of the first line of font F3 are changed in the same way.
6 pixels on the 1st line of font F4, 6 pixels on the 2nd line of font F1, ..., 6 pixels on the 12th line of font F4, 6 pixels on the 1st line of font F5, font F6
You can change the color by recording an "EXOR font" pack in the order of 6 pixels of the first line of 〓〓, ... and playing it back. In this case, for example, four "EXOR font" pixels are recorded consecutively so that a total of 24 pixels on the same line are changed in color, and then until a total of 24 pixels on the next line are changed in color. Mode 0 packs are recorded in an appropriate amount in synchronization with the music.

In addition, when a single character consisting of 8 fonts is written horizontally, it is written as "EXOR font" as shown in Figure 5B in the same way as explained in conjunction with Figure 1B.
The packs are recorded in the following order: "EXOR font" pack to change the color of 12 pixels in the leftmost vertical column of font F1, and "EXOR font" pack to change the color of the 12 pixels in the leftmost vertical column of font F5. Similarly, "EXOR font" packs for changing colors are sequentially recorded in the order of 12 pixels in one vertical column, . . . , 〓〓.

According to the present invention, the display image of the digital image signal is not limited to the above-mentioned numbers and characters, but can also be used to display musical notes (scores) and explanatory characters, and to change the color of graphic images.

Effects of the Invention As described above, according to the present invention, graphics commands for changing color numbers (pixel color codes) in units of a plurality of pixel widths smaller than one font size are recorded. On the device side, the display image can be gradually switched in a fixed direction in synchronization with the playback audio signal, and the display color can be smoothly switched in synchronization with the playback audio signal, similar to a video disc. It is.

[Brief explanation of drawings]

Fig. 1 is a diagram illustrating each embodiment of color change according to the method of the present invention, Fig. 2 is a diagram showing a state in progress of color change of one character, and Fig. 3 is an “EXOR font” reproduced by the present invention. Figures 4A and 4B are diagrams illustrating the data structure of the pack, and Figures 4A and 4B are diagrams illustrating an example of the relationship between the color change transition of a character image and the recording timing of the "EXOR font" pack. , FIGS. 5A and 5B are diagrams explaining other embodiments of the method of the present invention, FIG. 6 is a diagram showing an example of a CD signal format to which the present invention can be applied, and FIG. 7 is a diagram showing one data of a subcode. Figure 8 is a diagram showing the basic configuration of one pack; Figure 9 is a diagram showing an example of a CRT screen format; Figure 10 is a diagram showing the configuration of a "light font"pack; FIG. 11 is a diagram for explaining an example of a conventional color changing method, and FIG. 12 is a diagram showing an example of the contents of a color lookup table according to the method shown in FIG. 15-0 to 15-12...Display image, 16-1 to
16-13...Mode 0 pack transmission period, 17-
1-17-12…“EXOR font” pack.

Claims (1)

[Scope of Claims] 1. A record in which, together with a digital audio signal and a digital image signal, a graphics command for displaying each pixel of a display image of the digital image signal in a color based on its pixel color code is recorded. A method for recording graphics commands on a medium includes: a graphics command for changing the pixel color code to a pixel color code of a different color gradually in a certain direction of the display image, with a width of a plurality of pixels; A method for recording graphics commands, comprising recording on a recording medium intermittently or continuously in synchronization with a modulated audio signal of the digital audio signal. 2. The graphics command recording method according to claim 1, wherein the display image is a character, and the color change of the display image is performed in the direction of the character string.