KR20010060978A - Korean closed caption decorder having consonant and vowel combination display structure and control method thereof - Google Patents

Abstract

The present invention relates to a Korean subtitle broadcasting receiver having a consonant combination display structure and a control method thereof. In the prior art, at least 64,800 bytes or more of font data for realizing 2700 characters of a complete Korean font is created. Since the use of a ROM is required, the manufacturing cost of a microcontroller for implementing Korean closed caption broadcasting is more than four times higher than that of a conventional TV. Therefore, it is difficult for the hearing impaired to purchase a Korean closed caption receiver. As a very burdensome product price, there was a problem that acts as a factor to slow the activation of Korean subtitle broadcasting. Therefore, the present invention was devised to solve the above-described problems, and only the font data for the initial consonant, the neutral, and the final consonant of the Hangul consonants are stored in the font ROM, and then the completed Hangul code form is input. By converting the 2-byte subtitle broadcasting signal of the combination into a combined 3-byte Hangul phoneme display code, the font data of the phoneme stored in the FontROM is superimposed and displayed in one letter of Hangul, thereby minimizing the amount of font data stored in the FontROM. By preventing the price increase in hardware, the hearing impaired person can purchase Hangul closed caption receiver freely. Accordingly, it has the effect of activating Hangul closed caption broadcasting by laying the foundation for widespread price competitive and convenient Hangul closed caption receiver. have.

Description

Korean closed caption broadcasting receiver having a consonant combination display structure and its control method {KOREAN CLOSED CAPTION DECORDER HAVING CONSONANT AND VOWEL COMBINATION DISPLAY STRUCTURE AND CONTROL METHOD THEREOF}

The present invention relates to a Korean subtitle broadcasting receiver having a consonant combination display structure, and a control method thereof. Particularly, in a Korean subtitle broadcasting receiver employing a complete Korean code, a 3 byte Korean subtitle broadcasting signal input in the form of a complete Korean code is input. The present invention relates to a Korean closed caption broadcasting receiver having a consonant combination display structure for converting a phoneme display code into a Korean alphabet of one letter by superimposing superphony, neutral, and final triphone fonts.

The closed-caption receiver for receiving the closed-captioned Korean subtitles by adopting the current Hangul Korean code (KS5601), which is the standard for the Korean government's administrative network, or the TVs with the built-in TVs, respectively, are implemented in 2700 characters by the Hangul-completed codes. The font pattern is stored in the memory for the font.

Here, assuming that the font memory has a capacity of 192 pixels having a combination of one Hangul chisel composition Mars 12 × 16, a font ROM of 24 bytes is required to implement one font, and thus 2700 characters. In order to cope with all the complete Hangul fonts, a memory for the complete Hangul fonts of 64,800 bytes, which is at least 24 × 2700, is required.

This generally requires twice as much memory for the completed Hangul font as compared to using 24,000 bytes of memory in the TV set.

FIG. 1 is a block diagram showing the configuration of a typical Korean closed caption broadcasting receiver. As shown therein, a data slicer 10 which receives a composite video signal CVBS and determines whether caption information is present and outputs an interrupt signal; A program ROM 20 for storing program data relating to receiving and processing Korean subtitle information; RAM 30 for storing the currently calculated data; A central processing unit (40) for controlling an operation of interpreting and outputting corresponding Korean subtitle information in synchronization with an interrupt signal of the data slicer (10); Under the control of the central processing unit 40, the screen display unit 50 for outputting the algibi signal (R) (G) (B) or the blank signal (Fast Blank) to display the corresponding font at a specified position, The screen display unit 50 is a font ROM (52) for storing Hangul font data required for Hangul subtitle broadcasting; A video RAM 51 for receiving and storing a start address value of 2-byte Hangul font data stored in the font ROM 52; Under the control of the CPU 40, the font ROM 52 of the font ROM 52 is set based on a font start address value designated by the video RAM 51 at a designated position using a horizontal / vertical synchronization signal (Hsync) (Vsync). An on-screen generator 53 for reading a font and outputting an algibi signal R (G) (B) or a blank signal (Fast Blank); It consists of an oscillator 54 for determining the size of the horizontal direction of a character output from the on-screen generator 53, will be described in detail with reference to Figure 2 attached to the operation process according to the prior art configured as described above.

First, as the broadcasting station transmits caption information of 2 bytes on the 284th line of the composite video signal, which is the vertical retrace section of the TV signal line, the data slicer 10 first starts the horizontal synchronization signal (Hsync) as shown in FIG. 2. After a certain amount of time is delayed, if it matches 7 clock run-in signal pulses, it sequentially reads the start bits that are continuously input and judges the presence or absence of caption information, and transfers 2 bytes of caption information to a shift register (not shown). In addition to storing, the central processing unit 40 outputs an interrupt signal to process the same.

At this time, the central processing unit 40 reads a series of operation programs for receiving and processing the completed Korean subtitle information stored in the initial program ROM 20 and shares it with the program area of another function. The data slicer 10 2 byte information stored in the shift register is read in synchronization with the interrupt signal.

In addition, the CPU 40 determines whether the input 2-byte caption information is a character code or a control code, and if the character code is a character code, interprets it and stores the predetermined temporary information for display in the RAM 30. However, in the case of the control code, the screen display information is stored in the video RAM 51 in the screen display unit 50 in combination with the processing of the information and the control means of the user.

Accordingly, the screen display unit 50 under the control of the central processing unit 40 moves to the start address of the characters in the font ROM 52 stored in the video RAM 51, and the horizontal / vertical synchronization signal (Hsync) (Vsync) Reads the font pixel information corresponding to the character size specified by the oscillator 54 and displays the corresponding Hangul characters at a specified position in synchronization with the horizontal / vertical synchronization signal Hsync Vsync. ) (G) (B) or a blank signal (Fast Blank) is output.

That is, the screen display unit 50 transmits pixel information to the horizontal / vertical synchronization signal (Hsync) Vpixel and the pixel clock frequency from the address of the font ROM 52 where the font of the Hangul-completed character referred to by the character code starts. It is synchronously fetched and displayed on the screen.

In the case of using an 8-bit microcomputer, it corresponds to an extended address space exceeding 64,000 bytes of address space, and as a result of the increase in simple font pattern storage capacity, the price increases and inconvenience in writing a program to be controlled. .

That is, Z89C362, which is a conventional Korean caption broadcasting means, uses, for example, 128,000 bytes as an internal ROM to grab caption broadcasting information contained in the caption broadcasting receiver font and TV signal lines 21 and 282, and displays it on the screen. And it is used for fonts, and the 32,000-byte ROM of the TV receiver microcomputer is separately used. Accordingly, in order to implement a TV with a built-in Korean subtitle broadcasting function, about 160,000 bytes of memory are additionally required.

As described above, when the font data for implementing the 2700-character complete Hangul font is 24 bytes, the ROM for at least 64,800 bytes or more is required. Thus, the manufacturing cost of the microcontroller for implementing Hangul subtitle broadcasting is required. As it is more than four times higher than the existing TV's microcontroller, and this is a product price that is very burdensome for the hearing-impaired who should be a beneficiary of the Korean subtitle broadcasting receiver, it is a factor that slows down the activation of the Korean subtitle broadcasting. There was a problem working.

Accordingly, the present invention has been made to solve the above-described problems, and only after storing the font data for the initial consonant, the neutral, and the final consonants of the Hangul consonants in the font ROM, the completed Korean code form is input. To provide a Korean closed caption broadcasting receiver having a consonant combination display structure for converting a closed caption broadcasting signal of a three-byte Korean phonetic display code into superimposed fonts and displaying Korean characters with a single letter. There is this.

1 is a block diagram showing the configuration of a typical Korean closed caption broadcasting receiver.

FIG. 2 is a timing diagram illustrating closed captioning information on a line 284 of FIG. 1;

Figure 3 is a block diagram showing the configuration of a Korean closed caption broadcasting receiver having a consonant combination display structure of the present invention.

4 and 5 are flowcharts illustrating control operations of the central processing unit and the on-screen generator in FIG. 3, respectively.

FIG. 6 is a diagram illustrating an example flow of 'strong' display information processing in FIG. 3; FIG.

FIG. 7 is a pattern diagram illustrating each phoneme font and a superimposed font in 'river' in FIG. 3. FIG.

FIG. 8 is a pattern diagram illustrating pixel colors that may be generated in the on-screen generator of FIG. 3. FIG.

*** Description of the symbols for the main parts of the drawings ***

100: data slicer 110: program ROM

120: RAM 130: Central Processing Unit

140: screen display unit 141: video RAM

142: Font ROM 143: On Screen Generator

144: oscillator 145: attribute designator

According to an aspect of the present invention, there is provided a data slicer configured to receive a composite video signal, determine whether caption information exists, and output an interrupt signal; A program ROM for storing program data for receiving and processing Korean subtitle information and for storing an address value of a three-byte converted code corresponding to a two-byte completion code; RAM for storing the currently calculated data; A central processing unit for controlling the overall operation by interpreting the corresponding Korean subtitle information in synchronization with the interrupt signal of the data slicer, and outputting font addresses corresponding to initial, neutral, and final phonemes of the Korean phoneme; And a screen display unit for outputting screen display information of the Hangul characters completed by overlapping the corresponding font pattern selected by the font address of the central processing unit to a position designated by a horizontal / vertical synchronization signal.

Hereinafter, with reference to the accompanying drawings, the operation and effect of an embodiment of the present invention will be described in detail.

FIG. 3 is a block diagram showing the structure of a Korean closed caption broadcasting receiver having a consonant combination display structure according to the present invention. As shown in FIG. 3, data for outputting an interrupt signal by determining whether caption information is received by receiving a composite video signal (CVBS) Slicer 100; A program ROM 110 for storing program data related to reception and processing of Korean subtitle information and storing an address value of a two-byte completion code and a three-byte converted code in the form of a lookup table; RAM 120 for storing the current operation data; A central processing unit (130) for controlling the overall operation by interpreting the corresponding Korean subtitle information in synchronization with the interrupt signal of the data slicer (100), and outputting font addresses corresponding to initial, neutral, and final phonemes of the Korean phoneme; Screen display unit 140 for outputting the screen display information of the Hangul characters completed by superimposing the corresponding font pattern selected by the font address of the central processing unit 130 to the position specified by the horizontal / vertical synchronization signal (Hsync) (Vsync). ).

In addition, the screen display unit 140 includes a font ROM 142 storing font pattern data corresponding to initial, neutral, and final phonemes, which are Hangul phonemes necessary for Korean subtitle broadcasting; A video RAM 141 for receiving and storing address values of three font pattern data corresponding to initial, neutral, and final characters for displaying a single character; Under the control of the central processing unit 130, the font pattern data is input from the font ROM 142 using the address value of the font pattern data stored in the video RAM 141 through the included property specifying device 155. The color attribute of each font pattern data is designated and superimposed thereon, and the algivy signals R, G, B, and blank signals completed in synchronization with the horizontal / vertical synchronization signals Hsync and Vsync are completed. An on-screen generator 143 for outputting the data; An oscillator 144 that determines the size of the horizontal direction of a character output from the on-screen generator 143, described in detail with reference to Figures 4 to 6 attached to the operation process according to the present invention configured as described above do.

First, the font ROM 142 in the screen display unit 140 holds only fonts corresponding to each phoneme.

That is, in case of consonant consonants, for example, 'a' requires six kinds of fonts such as 'ga', 'angle', 'sphere', 'oyster', 'ear', and '귁'. In the case of, for example, 'ㅏ', two types such as 'ah' and 'hem' are required, and two kinds of finality are 'ang' and 'he'.

Therefore, the number of fonts of the phonemes to be used in combination should include fonts corresponding to each initial, neutral, and finality, so the initial font is 19 × 6, 114 fonts, the neutral vowel 21 × 2, 42 fonts, and the final font 27 ×. Since 52 fonts are required as 2, the 208 font patterns are required, and when the fonts are stored on a 12 × 16 pixel basis, a font ROM 142 having a capacity of about 4,092 bytes is required.

In addition, the data slicer 100 that detects a 2-byte complete code, which is caption information included in the 284th line of the composite video signal, which is a vertical blanking section of a TV signal line, converts the 2-byte complete Korean code into a shift register. At the same time, the central processing unit 130 outputs an interrupt signal to process the same.

In this case, the CPU 130 stores the address value of the 3-byte converted code stored in the program ROM 120 in the form of a look-up table in the RAM 120 and stores the 2-byte complete code stored in the shift register. It reads and finds the three-byte phoneme font address value for its initial, neutral, and final characters.

The CPU 130 stores the address values of the found three font pattern data in the video RAM 141 in the screen display unit 140, interprets the read control information, and controls the Korean subtitle broadcasting receiver. That is, a horizontal position, a vertical position value corresponding to a position to be displayed by the on-screen generator 143, and a respective position of each Hangul character to be displayed by performing a position to be displayed, a property of the character, and a special function together with the character display information Print an attribute.

In this case, the attribute may include, for example, a function of realizing a window such as underlining, blinking, italic font, raising caption and lower caption.

Accordingly, the on-screen generator 142 sets the vertical position to be displayed on the screen by counting the number of horizontal sync signals Vsync from the start point of the vertical sync signal Vsync, and sets the number of pixel pulses from the determined vertical position. How to add the horizontal display position.

Then, the font pattern data corresponding to the designated address is displayed from the font RAM 142 in order to display one address value of three types of font pattern data stored in the video RAM 141 from the predetermined display position. Hsync) and pixel pulses are read in synchronization with each other to determine red, blue and green character display RB (G) (B) and blanking signals (Fast Blank).

For example, when receiving and displaying a 2-byte complete code corresponding to 'strong' as shown in FIG. 3, when # 1011_0000 1010_1101b, which is a complete code of 'strong' included in the 284th line of the composite video signal, is read, In addition, the CPU 130 uses the code as an index to find an address value of 3 bytes from the lookup table stored in the program ROM 110 and store it in three areas of the video RAM 141. Accordingly, the position information of the screen to be displayed, the chromaticity of each phoneme, attributes, and the like, which are information according to the screen display operation, are output to the on-screen generator 142.

The on-screen generator 143 performs various operations based on the horizontal / vertical synchronization signal (Hsync) Vsync and the output pulses of the pixel oscillator 144 under the control of the central processing unit 130. .

In this case, the oscillation frequency 144 for pixels is generally about 10 MHz, and the position to be displayed on the screen reaches the designated vertical position value by adding the number of lines of the horizontal signal Hsync generated from the vertical synchronization signal Vsync. The display start position is a point coinciding with the horizontal display position information by adding the oscillation pulse for the pixel from the starting point and the start of the designated line.

Therefore, the font pattern data in the font ROM 142 corresponding to the three address values at which the video RAM 141 is stored from the starting horizontal line is simultaneously read and overlapped as shown in FIG.

At this time, it is shown as the on-off of the algibi output waveform in accordance with the pixel bit logic in the font ROM 142, the Hangul characters are displayed on the screen by the on-screen generator 142 according to the combination of the on-signal.

Since the n-th line pixels are scanned in synchronization with the horizontal sync signal Hsync, and the pixels corresponding to the next n + 1-th horizontal sync signal Hsync are scanned, each pixel in the corresponding line is synchronized with the pixel clock. The output of the color signal at the predetermined position is determined by the pixel bits output from the central processing unit 130.

In this case, the color is output when the pixel bit is 1, and is not output when the pixel bit is 0.

Therefore, when the pixel bit is 1, the shape of the Hangul characters is configured according to the combination of the outputs, and the attribute designating apparatus 145 for designating the attributes in the video RAM 141 representing the three fonts is provided. The screen generator 142 sets the colors of the three font pattern data differently, and the three colors appear in combination with each other.

For example, if three bits are assigned to designate one font color, at least eight colors can be displayed, and thus, the colors of each specified font are mixed to output 512 colors.

In addition, when displaying a pixel unit by combining red, green, and blue, as shown in FIG. 8, the output color is red, green, blue, and yellow in which the red and green are mixed. There are eight types: yellow, cyan combined with the green and blue, magenta, combined with the red and blue, white and black.

As described above in detail, the present invention stores only font data for the initial, neutral, and final phonemes of the Hangul consonants in a font ROM, and then inputs a 2-byte subtitle broadcasting signal in the form of a completed Korean code. By converting into a byte Hangul phoneme phone display code and superimposing font data of the corresponding phoneme stored in the font ROM and displaying it in one letter of Hangul, the amount of font data stored in the font ROM is minimized to prevent hardware price increases. Handicapped people can purchase Hangul subtitle broadcaster without hesitation. Accordingly, it is effective to activate Korean subtitle broadcasting by laying the foundation for widespread use of price-competitive and convenient Hangul subtitle broadcasting receiver.

Claims (6)

A data slicer which receives a composite video signal and determines whether caption information exists and outputs an interrupt signal; A program ROM for storing program data for receiving and processing Korean subtitle information and for storing an address value of a three-byte converted code corresponding to a two-byte completion code; RAM for storing the currently calculated data; A central processing unit for controlling the overall operation by interpreting the corresponding Korean subtitle information in synchronization with the interrupt signal of the data slicer, and outputting font addresses corresponding to initial, neutral, and final phonemes of the Korean phoneme; A consonant combination characterized in that it comprises a screen display unit for outputting the screen display information of the Hangul characters completed by overlapping the corresponding font pattern selected by the font address of the central processing unit to the position designated by the horizontal / vertical synchronization signal. A Korean closed captioning receiver having a display structure. The Korean closed caption broadcasting system according to claim 1, wherein the program ROM stores an address value of a phoneme font for converting a 2-byte complete code into a 3-byte phone code in a look-up table form. receiving set. The display apparatus of claim 1, wherein the screen display unit comprises: a font ROM storing font pattern data corresponding to initial, neutral, and final characters which are phonemes of Hangul required for Hangul subtitle broadcasting; A video RAM for receiving and storing address values of three font pattern data corresponding to initial, neutral, and final characters for displaying a single character; Under the control of the central processing unit, the font pattern data is input from the font ROM using the address value of the font pattern data stored in the video RAM, and overlapped with each other to synchronize the horizontal / vertical synchronization signal and the completed Algibi signal and blank. An on-screen generator for outputting a signal; Korean subtitle broadcasting receiver having a consonant combination display structure characterized in that the oscillator for determining the size of the horizontal direction of a character output from the on-screen generator. The apparatus of claim 3, wherein the on-screen generator further comprises an attribute designation device that designates color attributes of each of the three font data so that three color information is superimposed so as to differently designate the color of a pixel unit. A Korean closed captioning receiver having a vowel combination display structure. A first step of receiving a completed Hangul code and finding and storing an address of a matching 3-byte phoneme code when an interrupt signal is input; When the operation of the first step is completed, the control method of the Korean closed caption broadcasting receiver having a consonant combination display structure comprising a second step of determining and displaying the display. The method of claim 5, wherein the display operation of the second step comprises: a first step of reading font pattern data corresponding to an address of a stored three-byte phoneme code; And a second step of designating and displaying a display position, a color, and an attribute when the operation of the first step is completed.