JP3133114B2 - Graphics decoder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphics decoder which generates a graphics video signal to be supplied to an image display device such as a CRT display from a code signal and mixes it with another video signal.

[0002]

2. Description of the Related Art A sub-code is recorded on a disc such as a compact disc in addition to a digital audio signal which is a main code. This sub-code is standardized, for example, the magazine "JAS Journal"
l "in the October 1986 issue of the Japan Audio Association. The outline of the standard will be described first.

The subcode includes channels R to W in addition to channels P and Q for controlling reproduction of a main code signal, and these channels R to W are used for graphics and the like as described later. The subcode contains only one bit for each channel in one main frame.
Main frame (two frames of which are synchronous signal patterns)
The sub-frame is regarded as one sub-code frame. In order to handle 6-bit data of channels R to W,
Bits are defined as one symbol (SYMBOL), which is
It is determined that one symbol (PACK) is collected for the symbols.
Therefore, one subcode frame consists of 96 symbols.

In each pack, as shown in FIG. 6, symbol 0 has a mode (MODE) and an item (ITEM) for each three bits, and the mode and the item indicate the mode of the pack. For example, if the mode is 000 and the item is 000, the ZERO mode is set. If the mode is 001 and the item is 001, the TV graphics mode is set. Symbol 1 is an instruction (INSTRUCTION)
, And the symbols 4 to 19 are set in a data field (DATA Field). Instructions are instructions that determine the nature of the data field.
Symbols 2 and 3 are Q parity (PARITY Q0, Q
1) for error correction for symbols 0 and 1. Symbols 20 to 23 are P parity (PARITY
P0 to Q3) for error correction for symbols 0 to 19.

In the TV graphics mode, T
The configuration of the V screen is set based on the unit of font (FONT). As shown in FIG. 7, one font is composed of 6 pixels (PIXEL) in the horizontal (row) direction and 12 pixels in the vertical (column) direction, and the pixel is the smallest displayable pixel. This font is a screen that can actually be displayed on a TV screen with a width of 48 x 16 (SCREEN
N) An area is formed, and an area outside the area is formed by a border (BOR).
DER) area. The display memory of the TV screen is made up of 50 horizontal fonts × 18 vertical fonts by adding one font to each of the upper, lower, left and right sides outside the screen area in consideration of the scroll function, as shown in FIG. In addition, a pointer is defined to realize soft scrolling (SOFT SCROLL). The horizontal screen pointer PH indicates a horizontal shift amount for moving all pixel data in the display memory in the horizontal direction,
The vertical screen pointer PV indicates a vertical shift amount for vertically moving all the pixel data in the display memory.

Instructions for the TV graphics mode are defined as shown in FIG. In the preset instruction of the display memory of the instruction 1, the data area in the pack is configured as shown in FIG. All the fonts in the display memory are preset to the color number set by the color (COLOR) of the symbol 4, and the pointers PH and PV are reset to 0. In the preset command of the boarder of instruction 2, the data in the pack
The data area is configured as shown in FIG. 11, and the border area is preset to the color number set by the color (COLOR) of the symbol 4. In the foreground / background font writing instruction of instruction 6, the data area in the pack is configured as shown in FIG. This instruction is a sequence defined by symbol 6 (ROW)
And font data (color number data) of symbols 8 to 19 are written at the address position specified by the line (COLUMN) defined by the symbol 7. In FIG. 12, Y indicates the upper leftmost pixel in the font, and Z indicates the lower right pixel in the font. For the pixel whose font data is "0", COL of symbol 4
The color number determined by OR 0 is the background color, and the symbol 5 is assigned to the pixel whose font data is “1”.
The color number determined by COLOR1 of the COLOR1 is used as the foreground color as a bit plane (BIT PL
ANE) 0 to 3 are written.

In the scroll screen instruction with preset of the instruction 20, the data area in the pack is configured as shown in FIG. The COPH of the symbol 5 indicates the horizontal movement of the font data in the display memory. When COPH = 0, the font data does not move in the horizontal direction, and when COPH = 1, it indicates the rightward movement of all font data. The font data of the 49th line up to that point is scrolled and disappears, and the font data of the 0th line has the color number set by the color (COLOR) of the symbol 4. When COPH = 2, all the font data is moved to the left, and the font data up to the 0th line is displayed.
The font data is scrolled and disappears, and the font data of 49 lines becomes the color number set by the color (COLOR) of the symbol 4. The COPV of the symbol 6 indicates the vertical movement of the font data in the display memory.
When V = 0, the font data is not moved in the vertical direction. When COPV = 1, all the font data is moved in the downward direction. The 17th font data is scrolled and disappears, and the 0th row is lost. Font data is the color of symbol 4 (COLOR)
Will be the color number set in. When COPV = 2, all the font data is moved upward, the previous font data in column 0 is scrolled and disappears, and the font data in column 17 is the color (COLOR) of symbol 4. It becomes the set color number. The horizontal screen pointer PH is 0
The vertical screen pointer PV is set in a range of 0 to 11 pixels.

In the scroll screen instruction with copy of the instruction 24, the data area in the pack is configured as shown in FIG. The COPH of the symbol 5 indicates the horizontal movement of the font data in the display memory. When COPH = 0, the font data does not move in the horizontal direction. When COPH = 1, all the font data are moved.
This indicates that the font data has been moved to the right, and the font data up to the 49th line becomes the font data of the 0th line. When COPH = 2, all the font data is moved to the left, and the font data of the 0th line becomes the font data of the 49th line. COPV of the symbol 6 indicates the vertical movement of the font data in the display memory.
When = 0, the font data is not moved in the vertical direction, and when COPV = 1, all the font data is moved in the downward direction, and the font data up to 17 columns becomes the font data of 0 columns.
When COPV = 2, all the font data is moved upward, and the font data in the 0th column up to that becomes the 17th column.

Load 30 of instruction 30
For the color 0 to 7 instructions, the data area in the pack is configured as shown in FIG. This instruction is a color look-up table (COLOR LOOK-UPT) indicating which of the 16 colors the color number is.
ABLE) is specified in the first eight colors. Symbols 4-19
, Graphics RGB data represented by COLOR-0 to COLOR-7 are set using two symbols per color. The load CLUT color 8 to 15 instruction of instruction 31 specifies COL in the second half of the color look-up table.
OR-8 to COLOR-15 are set using two symbols per color. Regarding the color mixture for each color number, red consists of 4 bits of channels RU of even symbols assigned to one color number, and the green is the next 2 bits of channels V and W and the next odd number. The symbol consists of two bits of channels R and S, and the blue consists of four bits of the following channels T to W. Since the gray scale of each color is 2 ⁴ = 16 colors and 3 colors of RGB, it is possible to mix 16 ³ = 4096 colors. Also,
On the gray scale, “0000” is the darkest state, “11”
11 "is the highest luminance.

The exclusive OR font command of the instruction 38 is to set up to 16 colors in a font written in two or one color by a preset command or a foreground / background font writing command. Since the present invention described below has little relation, it will not be described in detail. In the transparency setting command of the instruction 28, the data area in the pack is configured as shown in FIG. This command is used to set the mixing ratio when graphics are mixed with moving images. The transparency lookup table (TRANSPARENCY LOOK) indicates the transparency of each of the 16 colors specified in the color lookup table. -UP
TABLE-) for symbols 4 to 19 TRANS-
0 to TRANS-15. This allows
Transparency is set for all pixel colors in 64 steps using 6 bits, and “000000” is opaque.
“111111” is in a completely transparent state.

On the basis of the sub-code defined as described above, the sub-code graphics decoder generates a TV graphics RGB signal from the sub-code signal supplied from the disc player 22. In a conventional sub-code graphics decoder, a sub-code signal obtained by performing signal processing on a read signal by a player 22 is supplied as shown in FIG. The graphics command of the input signal is interpreted by the interpretation unit 1. Commands such as a font writing command and font data as the result of interpretation by the interpreting unit 1 are provided in the address control circuit 2, the V (video) -RAM 3, and the color look-up table in accordance with the type of the data. Is supplied to one of the RAMs 4 for the cable. The address control circuit 2 sets a write address according to a write command, and sets a read address according to various data such as COPH at the time of scrolling. V-RAM
Reference numeral 3 denotes a display memory having at least a storage area corresponding to the screen area. The color look-up table (CLUT) RAM 4 has an area for storing RGB data corresponding to color numbers of 16 colors. For example, when the interpretation unit 1 interprets the font writing instruction of the instruction 6, an address of the V-RAM 3 determined by a column and a row included as data in the instruction is specified by the address control circuit 2, and the address is stored in the storage location of the address. Color number data as font data is written. V-RAM3
The font data is read out from the font data in accordance with the vertical synchronization signal and the horizontal synchronization signal.
The RGB data of the corresponding color number is read from the RAM 4 according to the data. The RGB data is converted into an analog RGB signal by a D / A converter 5 and then a luminance signal Y and color difference signals RY, B-
Converted to Y. Further, the signal output from the matrix circuit 6 is converted by the encoder 7 into a composite video signal. The composite video signal is supplied to the CRT display 8.

On the other hand, a load CLUT color of the instruction 30 is supplied from the subcode signal supplied to the interpretation unit 1.
Load CLU of 0-7 instructions or instruction 31
CLUT R when interpreting T color 8-15 instructions
The stored data of AM4 is rewritten, and the designated color corresponding to the color number changes. By the way, the use of such graphics to give superimposition of characters and the like to video in moving images and the like has been applied to karaoke apparatuses and the like. FIG. 18 shows the configuration of a sub-code graphics decoder corresponding to the super import. In FIG. 18, the same parts as those in the decoder of FIG. 17 are denoted by the same reference numerals, and the video signal output from the encoder 7 is supplied to the CRT display 8 via the switch 11. The switch 11 relays the video signal output from the encoder 7 to the CRT display 8 and converts the video signal from a video signal source 12 such as a VTR (video tape recorder) into a CRT according to a switching signal described later.
Relay to the RT display 8. The color setting circuit 13 includes a plurality of color number data and RGB corresponding to the color number data.
A memory (not shown) storing data, and one color number data and RGB from the plurality of data according to the operation.
A reading circuit (not shown) for selectively reading data. The read color number data is held in the register 14, and the RGB data is held in the register 15.
A match detection circuit 16 is connected to the output of the register 14. The match detection circuit 16 reads the color number data read from the V-RAM 3 and the color number data held in the register 14.
Data match. A match detection circuit 17 is connected to the output of the register 15, and the match detection circuit 17
A match between the RGB data read from the UT RAM 4 and the RGB data held in the register 15 is detected.
When the coincidence detection circuits 16 and 17 detect coincidence, they generate a switching signal. A switch 18 is connected to each output of the coincidence detection circuits 16 and 17. The switch 18 is automatically or manually switched according to the performance disk.
One of the output signals 6 and 17 is selected and supplied to the switch 11. Therefore, when the color number data of the color set by the operation and the color number data read from the V-RAM 3 match with the switch 18 selecting the coincidence detection circuit 16 side, the switching signal is output. Match detection circuit 1
6 to the switch 11 via the switch 18;
The video signal from the video signal source 12 is replaced by a CRT instead of the graphics video signal output from the encoder 7.
It is supplied to the display 8. On the other hand, color number data and V
When the color number data read from the RAM 3 does not match, the generation of the switching signal stops, and the video signal source 12
The video signal of graphics output from the encoder 7 in place of the video signal from is supplied to the CRT display 8. As a result, the graphics image is inserted into the moving image, and the image is superimposed. The same operation is performed even when the switch 18 selects the coincidence detection circuit 17 side.

Next, the configuration of a sub-code graphics decoder having a transparency look-up table for responding to the transparency setting command of the instruction 28 will be described with reference to FIG. In FIG. 19, the same parts as those of the decoder of FIG. 17 are denoted by the same reference numerals, and a disk player capable of playing a video disk is used. The color number data read from the V-RAM 3 is supplied to the CLUTRAM 4 and the transparency look-up table (TLUT) RAM 21. RAM
21 has a storage capacity of 6 bits × 16, and 6
Transparency data specified in four stages can be stored. R
When the color number data is supplied to the AM 21 from the V-RAM 3, the transparency data corresponding to the color number data is read. The transparency data stored in the RAM 21 is supplied from the interpretation unit 1 and written therein when the graphics command interpretation unit 1 interprets the transparency setting command. On the other hand, a video signal demodulated by playing the disk in the disk player 22 is supplied to the mixer 23. The mixer 23 has an ATT for attenuating the video signal from the disc player 22.
24 and A for attenuating the video signal from the encoder 7
It comprises a TT 25 and an inverter 26 for inverting the transparency data read from the RAM 21. The attenuation of the ATT 24 changes according to the read transparency data.
The degree of attenuation of the TT 25 changes according to the inverted data from the inverter 26. ATT24,25 output signal is CRT
It is supplied to the display 8. The transparency of the graphics image is the transparency data of the transparency lookup table.
For a color designated higher by the ATT 24, the attenuation of the ATT 24 decreases, the video signal from the disc player 22 is attenuated to a small extent, the attenuation of the ATT 25 increases, and the graphics video signal from the encoder 7 is increased. Is greatly attenuated. Conversely, for a color of a graphics image whose transparency is specified to be low by the transparency data of the transparency lookup table, the attenuation of the ATT 24 increases and the video signal from the disc player 22 increases. The ATT 25 is attenuated, and the graphics video signal from the encoder 7 is attenuated slightly. Therefore, the degree of superposition (overlay) on a graphics image of a moving image increases as the transparency increases.

As described above, the decoder having the super import function shown in FIG. 18 and the decoder shown in FIG.
There is a decoder with a ray function.
Decoders with a recording function are used in many CD karaoke devices, and decoders with an overlay function are L
Used in D (Laser Disk) karaoke devices.
However, conventionally, the super-import function and the automatic
CD karaoke device and L
When configuring a decoder compatible with D-karaoke equipment,
It is necessary to provide both a memory such as a register for designating the color of the superimpose and a TLUT RAM, which has a problem that the configuration of the decoder is extremely complicated.

[0015]

SUMMARY OF THE INVENTION An object of the present invention is to provide a graphics decoder having both a superimpose function and an overlay function with a relatively simple structure.

[0016]

The graphics decoder according to the present invention is a graphics decoder for generating a graphics RGB signal to be supplied to an image display device from a code signal and mixing it with an externally input video signal. Interpreting means for interpreting the TV graphics instructions in the signal;
Means for writing color number data indicating a font contained in the write command to a designated storage location in the display memory when the result of interpretation by the interpreter is a write command; read address setting means for sequentially setting read addresses of the display memory; Means for reading color number data from a storage location in the display memory corresponding to the read address; first storage means for generating a graphics video signal corresponding to the read color number data using a color look-up table; When the interpretation result of the interpretation means is a transparency setting command, a transparency lookup table which is updated by the transparency data for each color number included in the transparency setting command is provided, and the transparency data corresponding to the read color number data is stored in the transparency table. Second storage means for reading from the look-up table; Mixing means for mixing the input video signal and the graphics video signal at a mixing ratio according to the transparency data, and a transparency setting for a write command including transparency data for each color number as imposition data indicating only completely transparent or opaque. Means for generating to the interpreting means in response to a superimpose command as a pseudo-command of the command, wherein the mixing means includes an externally input video signal and a graphics signal in response to the imposed data read from the second storage means. It is characterized in that either one of the video signal and the video signal is selectively output.

Further, the graphics decoder of the present invention is a graphics decoder for generating a graphics RGB signal to be supplied to an image display device from a code signal and mixing it with an externally input video signal. Interpreting means for interpreting the TV graphics command therein, and when the interpretation result of the interpreting means is a write command, means for writing color number data indicating a font contained in the write command to a specified storage location in a display memory; Read address setting means for sequentially setting a memory read address; means for reading color number data from a storage position in a display memory corresponding to the read address; and a color look-up for a graphics video signal corresponding to the read color number data. Read from the up table The first storage means which is generated as a video signal and the transparency lookup table which is updated by the transparency data for each color number included in the transparency setting instruction when the interpretation result of the interpretation means is the transparency setting instruction are read out. A second storage unit for reading transparency data corresponding to the color number data from the transparency lookup table, a mixing unit for mixing an externally input video signal and a graphics video signal at a mixing ratio according to the transparency data, Means for generating a write command including superimposed video data as transparency data indicating transparency as a pseudo command of a transparency setting command to an interpreting means in response to a superimpose command, and a superimpose written in a transparency lookup table Video data and the first
Match detecting means for detecting a match with the graphics video data read from the storage means, and the mixing means determines whether the externally-input video signal and the graphics video signal correspond It is characterized in that either one is selectively output.

[0018]

In the graphics decoder of the present invention, at the time of overlay, color number data is sequentially read from the storage position of the display memory, and graphics video data corresponding to the color number data is read from the color look-up table. The transparency data corresponding to the color number data is read from the transparency lookup table, and the externally input video signal and the graphics video signal are mixed and output by the mixing means at a mixing ratio according to the transparency data. You. At the time of superimposing, instead of the transparency data, imposition data indicating only completely transparent or opaque is written in the transparency lookup table for each color number, and the color number data is read from the storage position of the display memory, and the color number is read. The imposition data corresponding to the data is read, and the mixing means selectively outputs one of an externally input video signal and a graphics video signal according to the imposition data.

In the graphics decoder of the present invention, at the time of overlay, color number data is sequentially read from the storage position of the display memory, and graphics video data corresponding to the color number data is read from the color lookup table. Also, the transparency data corresponding to the color number data is read from the transparency lookup table, and the externally input video signal and graphics video signal are mixed and output by the mixing means at a mixing ratio according to the transparency data. At the time of superimposing, superimposed video data indicating a specific color is written in the transparency lookup table instead of the transparency data, and is read from the superimposed video data and the color lookup table written in the transparency lookup table. Matching with the graphics video data is detected, and the mixing means selectively outputs one of the externally input video signal and the graphics video signal in accordance with the data matching detection result.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a graphics decoder according to the invention. In this graphics decoder, a subcode signal is supplied from a disc player 30 to a graphics command interpreter 31. The disc player 30 is a player that can play a disc such as a compact disc (including CDV) and a video disc (including LDD). The disc player 30 processes a read signal from the disc to extract a main signal and a subcode signal. Further, the main signal is demodulated to obtain a composite video signal. The graphics command interpreter 31 is composed of, for example, a hardware logic circuit, and has V-WRITE, CW
RITE, T-WRITE, COPHNCOPV, P
H, PV, ROW, COLUMN, BORDER CO
LOR, FONT DATA, COLOR DATA,
It has TRANS DATA. A 50-ary up / down counter 32 is connected to the output terminal COPH. The counter 32 is a 6-bit output. Output terminal C
The OPV is connected to an 18-digit up / down counter 33. The counter 33 is a 5-bit output. A 3-bit register 34 is connected to the output terminal PH.
A 4-bit register 35 is connected to the output terminal PV. A 4-bit register 36 is also connected to the output terminal BORDER COLOR. Counters 32 and 33
The output signals of the registers 34 and 35 are supplied to an address calculation circuit 37. The output terminals ROW, COL of the graphics instruction interpreting unit 31 are further provided to the address calculating circuit 37.
Signals are also supplied from the UMN via the registers 43 and 44. The output of the address calculation circuit 37 is connected to the address terminal of the V-RAM 39. The output terminal V-WRITE of the graphics command interpretation unit 31 is connected to the address calculation circuit 37 and the W / R control terminal of the V-RAM 39, and the output terminal FONT DATA is connected to the data input terminal of the V-RAM 39.

The color number data read from the V-RAM 39 is supplied from a data output terminal via a selector 40 to a CLUT.
It is supplied to the RAM 41 and the TLUT RAM.
The RAM 41 has a storage capacity of 4 bits × 16 for each of R, G, and B, and indicates a color tone of 16 colors specified by the color number data.
GB data can be stored. The write control terminal of the RAM 41 is the output terminal CW of the graphics command interpreting unit 31.
The RAM 41 has a 3 × 4 bit data input terminal connected to the output terminal COLOR DATA of the graphics instruction interpreting unit 31. The RAM 42 has a storage capacity of 6 bits × 16, and can store transparency data designated in 16 steps for each of 16 colors. RAM4
2 is connected to the output terminal T-WRITE of the graphics command interpreter 31, and the 6-bit data input terminal of the RAM 42 is connected to the graphics command interpreter 31.
Is connected to the output terminal TRANS DATA. The output of the register 36 is connected to the selector 40.
0 operates according to the output signal of the address calculation circuit 37.

A D / A converter 45 is connected to the output of the RAM 41, and the D / A converter 45 converts a digital RGB signal into an analog graphics RGB signal and supplies it to a matrix circuit 47. A mixer 49 is connected to an output of the matrix circuit 47 via an encoder 48. The mixer 49 has ATTs 50 and 51 and an inverter 52 similarly to the decoder shown in FIG. A
The video signal from the encoder 48 is supplied to the TT 50. The switch 54 selectively supplies one of a reproduced video signal of the disc player 30 and a video signal of a video signal source such as a VTR from the external video input terminal 53 to the ATT 51.

A selection switch 56 is connected to the output of the RAM 42. The selection switch 56 supplies the digital signal read from the RAM 42 to the ATT 51 as a control signal for the ATT 51 and also supplies the control signal for the ATT 52 to the ATT 52 via the inverter 52. A
The output signals of the TTs 51 and 52 are supplied to a CRT display 55. A match signal generation circuit 57 is connected to the output of the RAM 42.

FIG. 2 shows a specific configuration of the TLUT RAM 42 and the coincidence signal generation circuit 57. RAM 42 is 16
And 6-bit register 71 _{0-71 15} pieces min, selection switch 72 for selecting the outputs of the registers 71 ₀ to 71 ₁₅
A decoder 73 for converting 4-bit color number data relay-supplied from the selector 40 into 16-bit data in binary-hexadecimal data; and an output terminal T of the graphics instruction interpreting section 11 -AND to which a write command is supplied from WRITE
And a circuit 74. The selection position of the selection switch 72 changes according to the output signal of the decoder 73. Also, A
The output signal of the ND circuit 74 de in the register 71 _{0-71 15} - supplied as a data holding command signal.

The coincidence signal generating circuit 57 is eight coincidence detection circuit ₇₆ 0 _~76 7, AND circuits 77 and six buffer ₇₈ 0-78 ₅ are provided. Coincidence detection circuit 76 ₀
To 76 ₇ each twelve exclusive (Exclusive)
A match detection circuit 7 comprising an OR circuit and an AND circuit;
6 ₀ detects a match with 12-bit RGB data and one color of the RGB data held in the two registers 71 ₀ and 71 ₁ which is read from the CLUT RAM 41 bit by bit. Since the register ₇₁ 9 _{-71 15} I Oite the RGB data for one color at two consecutive registers is retained, coincidence detection lines for RGB data with each other a number even in the coincidence detection circuit ₇₆ 1 to 76 ₇ Will be That is, it is possible to detect coincidence with respect to specific colors of eight colors described later. The output signal of the coincidence detection circuit ₇₆ 0-76 ₇ logical product is supplied to the AND circuit 77 is taken, the output signal is further buffer ₇₈ 0 of the AND circuits 77 to 78
₅ is supplied. The output of the buffer ₇₈ 0-78 ₅ is connected to the select switch 56.

As shown in FIG. 3, the color setting circuit 61 has a memory 62 which stores two pseudo-code instructions in a subcode format. The pseudo-graphics instruction is a pseudo-instruction of the transparency setting instruction of the instruction 28, and the data area in the pack is configured as shown in FIGS. In the case of a specific color designation method, as shown in FIG. 4, eight colors are superimposed RGB using two symbols per color in the superimpose.
Specific color (PRESET-0 to PRESE) depending on the data
T-7). This is super
This is because the specific colors used for the import are not standardized on all disc manufacturers. In each of the specific colors, as in the case of the instructions 30 and 31, the red color is made up of the 4 bits of the channels RU of the even symbol,
The channel consists of 2 bits of the following channels V and W and the 2 bits of channels R and S of the next odd symbol, and the blue consists of 4 bits of the following channels T to W. In the case of the color number designation method, if the specific color is eight colors, for example, as shown in FIG. 5, all the channels R to W of the symbols 4 to 11 are completely transparent data indicating "111111". . If the specific color is less than eight colors, channels R to W of only the symbol corresponding to the color number of the specific color
Are completely transparent data "111111", and channels R to W of other symbols are opaque data "000000". The color setting circuit 61 is further provided with keys such as a superimpose operation key and a disc type selection key.
A board 66, a drive circuit 63 for selectively controlling the selection switch 56 in accordance with the operation thereof, a readout circuit 64 for selectively reading out the pseudo-graphics instruction in accordance with the key operation and supplying the pseudo-graphics instruction to the interpretation unit 31; A signal generation circuit 65 for generating a write inhibit signal a predetermined time after the supply of the pseudo graphics command. Note that the color setting circuit 61 can also be constituted by a microcomputer.

In such a configuration, the disc player 3
From 0, the subcode signal is sent to the graphics instruction interpreter 31.
When the graphics instruction in the subcode signal is determined to be a preset instruction of the memory of the instruction 1 from the content of the symbol 1, the interpretation unit 31 outputs a write signal from the output terminal V-WRITE, and outputs the write signal from the output terminal COLO.
The color number data specified by COLOR of symbol 4 is generated from R DATA, and the row signal and the column signal sequentially specifying all pixels in the screen area are generated from output terminals ROW and COLUMN. The row signal and the column signal are supplied to an address calculation circuit 37. The address calculation circuit 37 calculates a write address as data in accordance with the row signal and the column signal, and stores the write address data in the V-RAM 39.
Are sequentially supplied to the address terminals. Thereby, V-RA
The same color number data is written to the storage locations specified by all the addresses of M39. Output terminals PH, P
Data indicating “0” is output from V,
35 is reset.

When the interpretation unit 31 determines that the graphics command is a preset command for the border of the instruction 2, it outputs the color number data designated by the COLOR of the symbol 4 from the output terminal BORDER COLOR. This color number data is stored in the register 36. The interpreter 31 determines that the graphics instruction is instruction 6
Is determined to be a foreground / background font write command, a write signal is output from the output terminal V-WRITE to the output terminals R, COLUMN based on ROW and COLUMN of the symbols 6 and 7.
COLUMN outputs a row signal and a column signal designating a pixel of one font, and an output terminal C corresponding to “0” and “1” of each pixel of font data of symbols 8 to 19.
The color number data specified by COLOR 0 of symbol 4 or COLOR 1 of symbol 5 is generated from OLORDATA. The row signal and the column signal are supplied to an address calculation circuit 37. The address calculation circuit 37 sequentially calculates write address data for one font in accordance with the row signal and the column signal, and stores the write address data in the V-RAM 39.
Are sequentially supplied to the address terminals. Thereby, V-RA
In M39, the data of the storage position for one font is updated with the new color number data.

When the interpretation unit 31 determines that the graphics command is a scroll screen command with the preset of the instruction 20, the output value from the output terminal COPH is set according to the value of the COPH of the symbol 5. C
When OPH = 0, “0” is output, and when COPH = 1, “−” is output.
1 is output, and when COPH = 2, "+1" is output.
The same applies to the COPV of symbol 6;
The output value from the output terminal COPV is set according to the value of. When COPV = 0, “0” is output, when COPV = 1, “−1” is output, and when COPV = 2, “+1” is output. The respective values of the horizontal screen pointer PH of the symbol 5 and the vertical screen pointer PV of the symbol 6 are output to the output terminals PH and PV.
Output from Further, color number data specified by COLOR of symbol 4 is generated from the output terminal COLOR DATA, and row signals and column signals are sequentially generated from the output terminals ROW and COLUMN to sequentially specify all pixels in the area to be preset. The row signal and the column signal are supplied to an address calculation circuit 37. The address calculation circuit 37 sequentially calculates write address data of an area to be preset according to the row signal and the column signal, and outputs the write address data to the V-address.
It is sequentially supplied to the address terminals of the RAM 39. Thereby, the data of the storage position for the area to be preset in the V-RAM 39 is updated with the new color number data. When the interpretation unit 11 determines that the graphics command is the scroll screen command with the copy of the instruction 24, the interpreting unit 11 performs the same operation as that when the graphics command is determined to be the scroll screen command with the preset of the instruction 20. However, since the COLOR of the symbol 4 is not specified, the output terminals COLOR DATA, ROW, C
OLUMN does not output color number data.

The output data from the output terminal COPH activates the counter 32, and the count value of the counter 32 increases or decreases by the value indicated by the output data. The output data from the output terminal COPV activates the counter 33, and the count value of the counter 33 increases or decreases by the value indicated by the output data. Output data from the output terminals PH, PV, and BORDER COLOR are held in registers 34, 35, and 36, respectively. The address calculation circuit 37 has an output terminal V-WRITE.
When the write signal is not supplied from, the read address is calculated. The output value of the counter 32 is HSP,
Assuming that the output value of the counter 33 is VSP, the output value of the register 34 is PH, and the output value of the register 35 is PV, the read address ADDRESS is as follows: ADDRESS = HSP × 6 + PH + (VSP × 12 + PV) × 300 + N N is a value in the range of 0 to 299, and increases at a predetermined timing in synchronization with the horizontal synchronization signal. The 4-bit color number data from the storage position of the V-RAM 39 specified by the read address ADDRESS calculated in this manner.
Data is read. The 4-bit color number data is supplied to the RAMs 41 and 42 via the selector 40.
From 1, graphics RGB data of a color tone corresponding to the color number data is read out according to the color look-up table. Also, the transparency data corresponding to the color number data is read from the RAM 42 according to the transparency lookup table.
Data is read. That is, since the selection switch 72 switches the selection position in accordance with the color number data, the transparency data held in the register corresponding to the selection position is output via the selection switch 72. The address calculation circuit 37 stores the calculated read address in the V-RAM 39.
In the case other than the address, a switching signal for input selection of the selector 40 is generated. The selector 40 operates in response to this switching signal, and 4-bit color number data in the border area is supplied from the register 36 to the RAMs 41 and 42 via the selector 40.

The read graphics RGB data is converted by a D / A converter 45 into analog graphics RGB signals.
And an encoder 48 for converting it into a graphics video signal. On the other hand, the read transparency data is supplied to the mixer 49 via the switch 56. Mixer 49
Mixes the graphics video signal with the ATTs 50 and 51 at a mixing ratio corresponding to the transparency data with the video signal of the moving image from the disc player. Therefore, if the transparency data indicates “000000” in an opaque state,
The attenuation of the ATT 50 is the lowest and the attenuation of the ATT 51 is the highest, the graphics video signal is output from the mixer 49 as it is, and the transparency data is in a completely transparent state “1”.
11111 ", the attenuation of the ATT50 becomes the highest and the attenuation of the ATT51 becomes the lowest, and the moving image video signal is output as it is from the mixer 49. The video signal output from the mixer 49 is used as an image display device. CRT
The CRT display 55
For example, a video image in which a graphics image is added to a moving image is displayed on the screen.

When the interpretation unit 31 determines that the graphics instruction is a load CLUT color instruction of instructions 30 to 7, the output terminal C-WRITE to the RAM 4
1 and a write signal is supplied to the output terminal CO according to COLOR-0 to COLOR-7 of symbols 4 to 19.
3 × 4 bit graphics R from LOR DATA
GB data is sequentially output for eight colors. In accordance with the write signal, the RGB data is written to the storage locations of the RAM 41 determined in the order of the color numbers, and the color look-up table is updated. The same operation is performed even when it is determined that the graphics instruction is a load CLUT color 8 to 16 instruction of the instruction 38.

When the interpretation unit 31 determines that the graphics command of the sub-code signal from the disc player 30 is the transparency setting command of the instruction 28, the interpreting unit 31 sends the command from the output terminal T-WRITE to the RAM 42, ie, to the AN.
High level of the write signal to the register 71 _{0-71 15} via a D circuit 74 is supplied, output terminal T according TRANS-0~TRANS-15 symbol 4 to 19
RANS DATA outputs 6-bit transparency data. Transparency data is written to storage locations (registers 71 _{0 to} 71 ₁₅ ) determined in the order of color numbers in the RAM 42 in accordance with the write signal, and the transparency lookup table is updated.

The above operation is for the overlay function. Next, the operation of the superimpose function will be described. First, when the superimpose operation key is operated, the drive circuit 63 and the read circuit 64 operate according to the selected position of the disc type selection key. Disc player 3
When the disc set to 0 is a superimpose of a specific color designation method, the drive circuit 63 sets the selection switch 5
Switching the 6 into the selected state of the coincidence detection circuit 5 7. The reading circuit 64 reads the first pseudo graphics command having the data shown in FIG.
Feed to 1. Since the interpretation unit 31 determines that the graphics command is the transparency setting command of the instruction 28,
High level of the write signal to the output terminal T-WRITE via the AND circuit 74 registers 71 ₀ to 71 ₁₅ is supplied, the symbol 4~19 PRESET-0~PR
In accordance with ESET-7, superimposed RGB data is output from the output terminal TRANS DATA in 6-bit units. Superimposed RGB data is written to storage locations (registers 71 _{0 to} 71 ₁₅ ) determined in the RAM 42 in numerical order according to a write signal. After the writing is completed, the signal generating circuit 65 generates a low-level write inhibit signal, and according to the write inhibit signal, AND
The output level of the circuit 74 is maintained at a low level,
1 _0-71 new of RGB data writing to ₁₅ is inhibited. If the graphics command supplied by the disc player 30 playing the disc is the transparency setting command of the instruction 28, a write signal is output from the interpreter 31 so that the RGB data is prohibited from being responsive to the write signal. In order to

When the disc player 30 starts playing a disc, a subcode signal is supplied from the disc player 30 to the graphics command interpreting section 31, and the interpreting section 31 interprets the graphics command of the subcode signal as described above. . The color number data is written into the V-RAM 39 in accordance with the result of the interpretation, and the V-RA designated by the address ADDRESS calculated by the address calculation circuit 37.
The color number data is read from the storage location of M39. The read color number data is transferred to the RAM 4 via the selector 40.
1, 42. Graphics RGB data of a color tone corresponding to the color number data is read from the RAM 41 in accordance with the color lookup table. Since the selection switch 56 has been switched to the selection state of the signal from the coincidence detection circuit 57, the read data from the RAM 42 is not supplied from the selection switch 56 to the mixer 49.
Register ₇₁ 0 superimpose RGB data held in _{-71 15} always match detection circuit ₇₆ 0-76
₇ is supplied to the exclusive OR circuit of the RAM 41
Whether there is superimpose RGB data that matches the graphics RGB data read from is detected in the coincidence detection circuit 76 _{0-76 7.} Superimpose RG that matches graphics RGB data
If there is B data, any one of the output level of the coincidence detection circuit ₇₆ 0-76 ₇ goes high, the buffer 7
8 _0-78 signal indicating ₅ "111111" is supplied to the mixer 49 via the switch 56. Therefore, "1
11111 ", the attenuation of the ATT51 becomes the lowest, and the attenuation of the ATT51 becomes the highest in accordance with the output signal" 000000 "of the inverter 52. Therefore, the output of the graphics video signal is substantially prevented, and the moving picture video signal is mixed as it is. output from the vessel 49. in the case where both of the RGB data does not match becomes all output level of the coincidence detection circuit ₇₆ 0-76 ₇ low, indicating "000000" from the buffer buffer ₇₈ 0-78 ₅ The signal is supplied to the mixer 49 via the switch 56. Therefore, the ATT 51 has the highest attenuation according to the "000000" and the output signal "11111" of the inverter 52.
Since the degree of attenuation of the ATT 50 is minimized in accordance with “1”, the graphics video signal is output as it is from the mixer 49. On the screen of the CRT display 55, for example, a video in which a graphics image is superimposed on a moving image is displayed. Is displayed.

When the disk set in the disk player 30 is to make a superimpose by a color number designation method, the drive circuit 63 sets the selection switch 56 to the R position.
The state is switched to the selection state of AM42. Further, the reading circuit 64 reads the second pseudo graphics command having the data shown in FIG. 5 from the memory 62 and supplies it to the interpretation unit 31. Since the interpretation unit 31 determines that the graphics command is the transparency setting command of the instruction 28, the output terminal T
-Register 71 from WRITE via AND circuit 74
_{0-71 15} high-level write signal is supplied to an opaque data of symbols 4 to 19 - motor or fully transparent de -
Output from the output terminal TRANS DATA in 6-bit units. Opaque data and completely transparent data are written to storage locations (registers 71 _{0 to} 71 ₁₅ ) of the RAM 42 determined in numerical order according to the write signal. After the writing is completed, the signal generating circuit 65 generates a low level of the write inhibit signal, the output level of the AND circuit 74 maintains the low level in response to the write inhibit signal, to the register 71 _{0-71 15} Writing new data is prohibited.

The disc player 30 starts playing the disc.
When started, the superimpose of the specific color specification method
As in the case described above, the subcode signal is transmitted from the disc player 30.
Is supplied to the graphics command interpreter 31 and the sub
-The interpreter 31 interprets the graphics command of the
Interpret as follows. According to the interpretation result, the V-RAM 39
The color number data is written, and the address calculation circuit 37
V-RAM3 specified by the address ADDRESS calculated by
The color number data is read from the storage location No. 9. Read
The selected color number data is sent to the RAM 41 via the selector 40,
42. Color look-up from RAM 41
According to the table, the gradation of the color tone corresponding to the color number data
Fixed RGB data is read. Register 71
₀ ~ 71 _Fifteen Register corresponding to the color number data
From the switch 72 and the switch 56
And supplied to the mixer 49. Therefore, the color number data
If the data of the corresponding register is "111111",
The attenuation of the ATT51 becomes the lowest and the output of the inverter 52
According to the force signal “000000”, the attenuation of ATT50
Since the video signal is the highest, the video signal is
Output from On the other hand, registers corresponding to color number data
If the data is “000000”, the attenuation of ATT51
And the output signal of the inverter 52 becomes “1111”.
11 ", the attenuation of the ATT50 is minimized.
The output of the image video signal is almost blocked,
The extracted graphics video signal is used as it is by the mixer.
49. On the screen of the CRT display 55
Has a superimposed graphics image
A moving image is displayed.

In the above-described embodiment, the V-RAM 39 serving as a display memory stores color number data indicating a font only in the screen area, and stores the color data.
The register 20 stores the color number data of the area. The V-number including the color number data of the border area is stored in the register 20.
The memory may be stored in the RAM. Further, in the above-described embodiment, the moving picture video signal and the graphics video signal are obtained by playing the disc. However, only the graphics video signal is obtained by playing the disc, and the May be obtained from an external input terminal.

Further, in the above-described embodiment, RGB
Although the moving image and the graphics are mixed after the signal is converted into the composite video signal, if the moving image can be obtained as an RGB signal, the moving image and the graphics may be mixed at the stage of the RGB signal. Also, it is not necessary to mix moving images and graphics, and a mixture of graphics may be used.

[0040]

In the graphics decoder of the present invention, at the time of superimposing, instead of the transparency data, the transparency look-up table is written with the impose data indicating complete or opaque only for each color number, and is stored in the display memory. Color number data is read from the position,
The imposition data corresponding to the color number data is read, and one of an externally input video signal and a graphics video signal is selectively output according to the imposition data.

Further, in the graphics decoder of the present invention, at the time of superimposing, superimposed video data indicating a specific color is written in the transparency lookup table instead of the transparency data, and written in the transparency lookup table. A match between the superimposed data and the graphics video data read from the color look-up table is not detected. One of the externally input video signal and the graphics video signal is selected according to the data match detection result. Is output.

Therefore, according to the present invention, the TLUT RAM is used to specify the color of the superimpose, so that the number of memories can be reduced as compared with the conventional decoder. With a simple configuration, it can have both a super-import function and an overlay function.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration of a RAM 42 and a coincidence signal generating circuit 57 in the decoder of FIG.

FIG. 3 is a block diagram showing a specific configuration of a color setting circuit 61 in the decoder of FIG.

FIG. 4 is a diagram showing a structure of a data area in a pack in a first pseudo graphics instruction.

FIG. 5 is a diagram showing a structure of a data area in a pack in a second pseudo graphics instruction.

FIG. 6 is a diagram showing a structure inside a pack.

FIG. 7 is a diagram showing a structure in a font.

FIG. 8 is a diagram showing a configuration of a display memory.

FIG. 9 is a diagram showing types of TV graphics instructions.

FIG. 10 is a diagram showing a structure of a data area in a pack in a preset instruction of a display memory.

FIG. 11 is a diagram showing a structure of a data area in a pack in a preset command of a border.

FIG. 12 is a diagram showing a structure of a data area in a pack in a foreground / background font writing instruction.

FIG. 13 is a diagram showing a structure of a data area in a pack in a scroll screen instruction with a preset.

FIG. 14 is a diagram showing a structure of a data area in a pack in a scroll screen instruction with a copy.

FIG. 15 is a diagram showing a structure of a data area in a pack in load CLUT colors 0 to 7 instructions.

FIG. 16 is a diagram showing a structure of a data area in a pack in a transparency setting command.

FIG. 17 is a block diagram showing a schematic configuration of a conventional sub-code graphics decoder.

FIG. 18 is a block diagram illustrating a schematic configuration of a sub-code graphics decoder having a super-import function.

FIG. 19 is a block diagram showing a schematic configuration of a sub-code graphics decoder having an overlay function.

[Description of Signs of Main Parts]

 ··········· 31, ··· Interpretation unit 3,39 ··· V-RAM 4,41 ··· CLUT RAM 8,55 ··· CRT display 21, 42 ··· TLUT RAM 37 ··· ..Address calculation circuit 49... Mixer

Continuation of the front page (56) References JP-A-61-273674 (JP, A) JP-A-62-32494 (JP, A) JP-A-1-241083 (JP, A) JP-A-60-220387 (JP) , A) JP-A-63-198092 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09G 5/06 G06T 11/00 G09G 5/377 H04N 9/74

Claims (6)

(57) [Claims] 1. A graphics decoder for generating graphics RGB signals to be supplied to an image display device from a code signal and mixing the generated RGB signals with an externally input video signal, wherein the graphics decoder interprets a TV graphics command in the code signal. Interpreting means for writing, when the interpreted result of the interpreting means is a write command, means for writing color number data indicating a font included in the write command to a designated storage location in the display memory, and sequentially changing the read address of the display memory. A read address setting means for setting, a means for reading color number data from a storage position in the display memory corresponding to the read address, and a color lookup table for the graphics video signal corresponding to the read color number data. A first storage unit generated by using the When the interpretation result is a transparency setting instruction, the transparency lookup table is updated by the transparency data for each color number included in the transparency setting instruction, and the transparency data corresponding to the read color number data is obtained by the transparency lookup. Second storage means for reading from the table, mixing means for mixing the externally input video signal and the graphics video signal at a mixing ratio corresponding to the transparency data, and transparency data for each color number being completely transparent or opaque only Means for generating a write command including as the imposed data indicating the superimposition command as a pseudo command of the transparency setting command in response to the superimpose command, wherein the mixing means reads out from the second storage means. The video signal of the external input and the graphics Graphics decoder, characterized in that selectively outputs either the O signal. 2. The data generating means includes: a first horizontal screen pointer indicating a horizontal shift amount to be moved in a horizontal direction in a font unit; a second horizontal screen pointer indicating a horizontal shift amount to be moved in a horizontal direction in a pixel unit; A first vertical screen pointer indicating a vertical shift amount to be moved vertically in font units and a second vertical screen pointer indicating a vertical shift amount to be moved vertically in pixel units as the pointer data from the interpretation means; A first counter for accumulating the first horizontal screen pointer, a second counter for accumulating the first vertical screen pointer, a first register for holding a second horizontal screen pointer, and holding a second vertical screen pointer A second register to calculate the read address according to the output values of the first and second counters and the first and second registers. 2. The graphics decoder according to claim 1, further comprising: a calculation unit that performs calculation. 3. The first storage means updates the color look-up table with graphics RGB data corresponding to a color number included in the color look-up table write instruction when the interpretation result of the interpretation means is a color look-up table write instruction. The graphics decoder according to claim 1, wherein 4. A graphics decoder for generating a graphics RGB signal to be supplied to an image display device from a code signal and mixing it with an externally input video signal, wherein the graphics decoder interprets a TV graphics command in the code signal. Interpreting means for writing, when the interpreted result of the interpreting means is a write command, means for writing color number data indicating a font included in the write command to a designated storage location in the display memory, and sequentially changing the read address of the display memory. Read address setting means for setting, means for reading color number data from a storage position in the display memory corresponding to the read address, and the graphics video signal corresponding to the read color number data from a color lookup table. Read out as the graphics video signal And a first lookup table that is updated by transparency data for each color number included in the transparency setting command when the interpretation result of the interpretation means is a transparency setting command. Second storage means for reading transparency data corresponding to color number data from the transparency lookup table;
Mixing means for mixing the externally input video signal and the graphics video signal at a mixing ratio according to the transparency data, and a write command including superimposed video data indicating a specific color as the transparency data; Means for generating a pseudo-instruction to the interpreting means in response to a superimpose command, superimposed video data written in the transparency lookup table, and graphics video read from the first storage means. Match detecting means for detecting a match with data, wherein the mixing means selectively selects one of the video signal of the external input and the graphics video signal according to a data match detection result of the match detecting means. A graphics decoder characterized by outputting to a graphics decoder. 5. The apparatus according to claim 5, wherein the second storage means writes one piece of the superimposed video data into a writing area for two pieces of the transparency data in the transparency lookup table. The graphics decoder according to claim 4. 6. The graphics decoder according to claim 4, wherein said superimposed video data is RGB data.