KR100232954B1 - Close-caption pop-on display method - Google Patents

Abstract

The present invention relates to a pop-on display method of a receiving apparatus for receiving a viewer selectable caption broadcasting in which caption information is inserted and transmitted on any one horizontal line which does not affect a broadcasting signal for every field of a television signal, Extracting a caption signal from the signal; Discriminating the "received and stored" control code from the extracted caption signal; Storing the received meta information and control information in a reception buffer until the " display "control code is determined in response to the " reception storing" control code; And displaying pop-on information on the screen on the screen in response to the "view" control code.

Description

How to display pop-on caption broadcasting of selected viewer type

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caption broadcasting method and a receiving method, and more particularly, to a pop-on display method of caption broadcasting of a viewer-type caption broadcasting capable of popping up an actor's metabolism on the same screen with an actor.

In a television broadcasting, a closed caption broadcasting system is a system in which an caption signal is superimposed on an active section of a television signal so that an open caption system that displays urgent news or notifications by selecting a broadcasting person without selecting a viewer, That is, a closed caption system in which a caption signal is transmitted in a vertical blanking period and is transmitted, a television screen and a metabolism content can be viewed as a caption by a viewer's choice.

Closed Caption closed caption broadcasting has been implemented in the United States since 1978 for the hearing impaired who can not know the contents of the screen without sign language.

U.S. Patent No. 5,294,982, published March 1994, discloses a closed captioning method of roman and syllabic characters. In particular, the captioning method of Korean is described in great detail. In the invention of the US patent, in order to broadcast Korean by a closed caption system, a Korean character is divided into respective phonemes of the first, second and third phonemes and transmits an ASCII code corresponding to each phoneme, and the receiver decodes the ASCII code, , The neutral character and the last character are mapped to display a Korean character.

Since the conventional Hangul close caption method uses at least 2 to 3 bytes to represent Korean characters, the transmission speed and display speed are slow and the position of one character must be found by combining 3 to 4 bytes in the decoding process. There is a problem that the processing is complicated. The complexity of the decoding process increases the cost of the decoder. This causes a problem that increases the cost of the decoder that millions of viewers have to pay in comparison with the encoder required only in the broadcasting station.

In addition, simultaneous display of Chinese characters, Korean, and Japanese, and simultaneous display of English, Russian, and Greek are impossible, and special symbols can not be displayed.

Further, since the control code is required in displaying the dialog information in the middle of displaying the additional information and again displaying the additional information, there is no independence between the dialog information and the additional information, and a control system for distinguishing the display modes of the dialog information If the display mode control code is not received at the time when the receiving apparatus starts to operate, it is impossible to display the metabolism information until the next control code is received.

In addition, since the invention described above is developed based on a US TV transmission environment, that is, a flat geographical environment, it is pointed out that the reception quality of the receiving apparatus is poor and the quality of the subtitle display is poor in the geographical environment of Korea where the mountain is 70% . In addition, in the viewer selectable caption broadcasting, the pop-on function for displaying the caption on the position of the corresponding person on the screen is adopted in the metabolism caption such as drama. In the receiving apparatus that performs the pop-on function, since the data is once stored in the receiving buffer and then displayed by the screen-view control code, a double receiving buffer composed of the receiving page and the display page is required. The increase in the memory capacity of such a receiving buffer raises the cost of the receiving apparatus.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pop-on display method of a viewer-selectable caption broadcasting which can reduce the memory capacity of a reception buffer by displaying a pop-on display in real time in order to solve the problems of the related art.

In order to achieve the above object, the present invention provides a pop-on display method of a receiving apparatus for receiving a viewer selectable caption broadcasting in which caption information is inserted into any one horizontal line which does not affect a broadcast signal for every field of a television signal, Extracting a caption signal from a video signal of a received television signal; Discriminating the "received and stored" control code from the extracted caption signal; Storing the received meta information and control information in a reception buffer until the " display "control code is determined in response to the " reception storing" control code; And displaying pop-on information on the screen on the screen in response to the "view" control code.

1 is a block diagram showing a configuration of a television broadcasting system for viewer-selectable caption broadcasting according to the present invention;

2 is a block diagram showing a configuration of a television receiver for receiving viewer-selectable caption broadcasting according to the present invention;

3 is a signal configuration diagram showing a configuration of a subtitle signal according to the present invention;

4 is a diagram showing a data packet structure of caption data according to the present invention.

5 is a diagram for explaining a control code according to the present invention;

6 is a block diagram of a Korean character type code table for explaining a configuration of a character code according to the present invention.

7 is a view for explaining a size of a caption area on a screen according to the present invention.

8 is a diagram for explaining a character cell and a display cell of Hangul, Hanja, and English at the time of lateral writing according to the present invention.

9 is a diagram for explaining character cells and display cells of Hangul, Hanja, and English at the time of vertical writing according to the present invention.

10 is a flowchart for explaining a pop-on display method according to the present invention.

Fig. 11 and Fig. 12 are screen state diagrams showing a pop-on display screen according to the present invention; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention.

1 shows a configuration of a television broadcasting apparatus having a viewer selectable caption broadcasting function. The audio signal input through the microphone 10 is mixed and amplified in the audio signal processing unit 30 and transmitted to the television signal modulating unit 50. [ The video signal input through the video camera 20 is amplified in the video signal processing unit 40, edited, and transmitted to the television signal modulating unit 50. The television signal modulating unit 50 FM-modulates the transmitted voice signal, AM-modulates the video signal in the left-side full wave mode, frequency-multiplexes the AM modulated signal and the FM modulated signal, And the high frequency output unit 60 amplifies the high frequency signal and transmits the television signal to the air through the antenna.

In the subtitle encoding unit 70, the supplementary information such as the metabolic information related to the television screen or the urgent news or delivery information is input through the character information input unit 71. [ And various control information for caption control are input through the control signal input unit 72. [ The character information input unit 71 includes a keyboard for inputting characters such as Hangul, English, Kanji, and Japanese, and special characters, and outputs the inputted character information as a 2-byte Hangul complete code (KSC5901). The control information input unit 72 includes keypads such as a mode selection key and a function selection key, and outputs the input control information in a 7-bit binary code.

The character code generating unit 73 uses the MSB of each byte of the inputted 2-byte character code as the metadata subtitle / additional information flag, substitutes the MSB into '0' in case of additional information, adds a parity bit to each byte Thereby generating a data packet of a total of 18-bit character codes.

The control code generating unit 74 divides the input 7-bit binary number into upper 3 bits, upper 4 bits, parity bit for the upper 4 bits, control code identification bit for 2 bits, and metablock / addition flag to generate the upper byte A first parity bit, a second parity bit, a 2-bit control code identification bit, and a subtitle / additional information flag for the lower 3 bits are added to generate the lower byte. A parity bit is added to each generated byte to generate a data packet of a total of 18 bits of control code. The details of the data packet will be described later.

The data packet modulating section 75 modulates the data packet generated in the character code generating section 73 or the control code generating section 74 by a digital modulation method.

The synchronous counter 76 receives the synchronous signal provided from the video signal processor 40 and is reset by the vertical synchronous signal, counts the horizontal synchronous signal, and counts the scanning player. The window signal generator 77 receives the count value of the synchronization counter 76 and generates a window signal. The window signal is a driving signal for switching the switching means 78 to superimpose a caption signal on a predetermined specific line of the video signal output from the video signal processing unit 40.

2 shows a configuration of a television receiver for receiving viewer selectable caption broadcasting.

The tuner unit 110 demodulates a television signal of a selected channel among the high-frequency signals received by the antenna, and outputs a voice signal and a video signal. The audio signal is transmitted to the audio signal processing unit 120, and is then equalized and amplified and output as a voice through the speaker 130. The video signal is transmitted to the video signal processing unit 140, subjected to luminance and color processing, and then output as an RGB signal. The RGB signal is transmitted to the display driver 160 through the mixer 150 and the display driver 160 drives the CRT 170 in response to the RGB signal transmitted thereby to display the television screen on the screen.

The subtitle decoding unit 200 digitally converts the video signal through the A / D converter 210 and transmits the digital signal to the subtitle processor 230. Also, the sync separator 220 separates the sync signal from the video signal and transmits the vertical and horizontal sync signals to the caption processor.

The caption processing unit 230 generates a clock signal synchronized with the color burst signal of the video signal processing unit 140 to extract a caption data packet from the digital signal. Decodes the extracted data packet, controls the caption processing in response to the decoded control code, reads the character data from the font ROM 240 in response to the decoded character code, and stores the read character data in the display RAM 250. When the pop-on mode is checked, the caption processing unit 230 deletes the reception storing and clearing control codes among the control codes of the receiving buffer, and reads the pop-on character data stored in the display RAM by the line-wrap control code in a scroll manner, Converts the character data into an RGB signal, and transmits the converted RGB signal to the mixer 150. The caption processing unit 230 exchanges control data with the system control unit 180 of the set. The system control unit 180 transmits a caption related command input through the command input unit 19 to the caption processing unit 180 and controls the system in response to the control data transmitted from the caption processing unit 180. [

The detailed configuration of the caption information to be used in the above-mentioned caption broadcasting transmission / reception system is as follows.

In Korea, M-NTSC TV signals of 525 lines and 60 fields / second are used as broadcast signals, and the vertical blanking period is defined from the scanning line 10 to the scanning line 20.

There are no standards established by the Ministry of Information and Communication for the use of signals in the vertical blanking period. For reference, there are ITU-R Rec 473-2 and FCC Report and Order 83-120 in the United States.

The caption signal can use any one of the scanning lines 10-20 or the scanning line 21 or the scanning line 262 in the vertical blanking period for transmission of the caption data. You can also use more than one for other purposes, such as increasing data throughput. However, we do not consider all field data transmission in closed caption broadcasting because it is meaningless.

The caption data signal must be used only for transmission of the color TV signal, and the transmission bit rate should be set to the color subcarrier frequency fsc (3579545 (b)). The transmission bit rate of the subtitle data should be 447443.125 bps ± 125 bps, ± 10 Hz) and must be frequency synchronized to the color burst. The color subcarrier preferably has a continuous phase between the scanning line and the scanning line. If the phase of the color subcarrier is discontinuous for screen editing or the like, the color burst of the corresponding scanning line must be phase-synchronized at least.

In the data modulation method, the one corresponding to the logical value '1' is represented by one sinusoidal wave having the phase of 0 degrees and the frequency of fsc / 8 (447.443 kHz), and the one corresponding to the logical value '0' And a digital modulation method called Binary Phasc Shift Keying (BPSK) or Phase Rcvrsical Keying (PRK), which is expressed by a sinusoidal wave having a frequency of fsc / 8 (447.443 kHz). The maximum range of phase jitter is ± 10 degrees. The optimal signal waveforms will vary according to the frequency spectrum characteristics of the TV channels and will be defined in the future. However, since the BPSK waveform may undergo severe distortion at a portion where a logical value transition occurs due to a fundamental band-limited frequency, a phase-corrected waveform may be used for broadcasting after passing through a secondary Butterworth filter having a cutoff frequency of 3.5 MHz . The impulse response of the Butterworth filter used is:

The test method and rationale are defined in No. I-7 (TV broadcasting station) item 4 (teletext broadcasting) clause (the overlap position of the data line and the amplitude of the character signal) among the radio station inspection items, and the waveform of the caption signal is not NRZ It is not necessary to apply the above standard because it is a pure sinusoidal wave. However, the maximum value of the sinusoidal wave is 90 ± 5 IRE in order to expand the coverage area due to the region where the mountainous region is 70% or more like Korea. Although the maximum amplitude of the regular data signal is defined, the maximum value of the overshoot can be 5 IRE because it may include overshoot due to the filter passband characteristics.

Referring to FIG. 3, the data line of the caption signal is composed of six cycles of a bit clock synchronizing signal 302, a weed start signal 304, and an 18-bit data string 306.

The bit clock synchronizing signal 302 is a sinusoidal signal of six periods, which can be used for extracting the signal from the subtitle decoder and reading the bit period of 18-bit data. The frequency is fsc / 4 (894.886 kHz). When the phase of the color subcarrier of the corresponding scanning line is 0 °, it starts from a point at a distance of 9.5 usec (34 cycles of the color burst) from the falling edge intermediate point (0H) of the horizontal synchronizing signal, and the phase of the color subcarrier At 180 degrees, the falling edge of the horizontal sync signal starts at a distance of 9.64 usec (34.5 cycles of color burst) from the midpoint (0H). Since this signal is frequency synchronized with the color burst of the corresponding line, a bit clock synchronizing signal can be extracted from the color burst.

The word start signal 304 serves to represent the start of an 18-bit data packet as one period of a sinusoidal signal having fsc / 16 (223.722 kHz) and a phase of 180 degrees.

The data string 306 is composed of 18 bits and the bit rate is fsc / 8 (447.443 kHz) and modulated in the BPSK scheme.

Referring to FIG. 4, the data packet is composed of three parts: a parity (p) in units of Weed, a subtitle / additional information flag (C / T), and a code value. D0 to D8 shall be called lower word, and D9 to D17 shall be called upper word. D17 represents an even parity for D0 to D16. This parity bit is intended to detect errors on the transmission first. D7 and D16 are the subtitle / additional information flags, 0 for the subtitle subtitle, 1 for the additional information, and the values of D7 and D16 must match. This flag is used to maintain the word-based priority. D0 to D6 and D9 to D15 together represent the code value. Code values are interpreted as control codes if D5, D6, D14, D15 are mode 0, otherwise they are interpreted as character codes.

Referring to FIG. 5, the control codes D1, D2, D3, D9, D10, D11 and D12 are control code data bits, and D0, D4, D8 and D13 are parity for control code data bits. The 3-bit code value of the lower word is a code that specifies five functions. The five functions consist of color assignment function, character attribute and roll-up function, display method and roll-down function, position shift function and matrix positioning function. In addition, the 4-bit code value of the upper word of the control code designates 16 sub-functions of each function. D0 is parity for D1, D2, D3 and D4, D4 is parity for D1, D2, D10 and D11, and D13 is parity for D9, D10, D11 and D12.

In addition, the control code is transmitted twice consecutively for secure reception of data, so that the horizontally / vertically-specified code and the matrix positioning code are transmitted almost periodically every 4 seconds. A detailed description of the control code will be given later .

As shown in FIG. 6, character codes D0 to D6 of the lower word and D9 to D15 of the upper word together represent data bits of the KSC5601 code. D8 is an even parity for D0 to D7.

In the present invention, since ASCII code is not used at all, seven bits D0 to D6 correspond to seven bits of the lower byte of KSC5601, and D9 to D15 correspond to seven bits of the upper byte. (Special characters), A3 row (English), A4 row (bearing), A5 row (Greek), AA-AB row (Japan Kana), AC row (Russian), lines BO to C8 (Korean), and CA to FD (Chinese characters). The character code is transmitted only once per character.

The Korean subtitles can be transmitted using any scanning line per field as described above, and one or more transmission scanning lines defined in the field are referred to as channels. Since there are two fields in the interlaced scanning method, NTSC TV can use two channels. In other words, it is possible to use the bilingual subtitles such as the voice multiplex. Among them, the ambiguous subtitles for Korean language should use the odd field channel and the other foreign language dedicated subtitle for the even field channel. The control codes transmitted for each channel are the same code set, and character codes are all included in KSC9501.

There are two kinds of information transmitted to the caption channel, and the interpretation and display method of the control code differs depending on the type. One of these two is the subtitle associated with the video signal being broadcast, and the other is additional information not related to the broadcast content displayed on the screen.

If both the LSWord of the data packet structure and the MSWord have a value of '0', the code value is interpreted as a control code or character code for display of a metabolic film. In this case, the subtitle is displayed in the form of a subtitle matching the voice signal while covering only a part of the screen to be broadcasted.

It uses only 2 ~ 5 lines of subtitles at the same time, and scrolls, erases, and rewrites the area to display the continuing dialogue.

When only one channel is transmitted, characters of various countries may be used in a mixed manner, or may be used only for a Hangul or a foreign language. When they are transmitted through two channels, they are separately used for a Hangul exclusive channel and a foreign language exclusive channel, respectively.

Since the metabolism film should coincide with the voice information as much as possible, it has a higher priority than the additional information in occupying the channel in units of two words.

If both the LSWord of the data packet structure and the MSWord have values of the subtitle / additional information flags of '1', the code value is interpreted for display of additional information whether it is a control code or a character code. The additional information display displays text information on the entire screen as in computer communication regardless of the broadcast contents. Do not use the scroll function because it is displayed in full screen.

The additional information does not need to be separated like the metabolic information and the additional information can occupy the channel whenever the metabolism information is not displayed on the channel. However, when the metabolism is to be transmitted, And the channel can be occupied again after the transfer of the subtitles is completed.

The following describes the screen display according to the horizontal writing specification of the subtitle at the receiver.

Referring to FIG. 7, the caption area 702 refers to a maximum area in which the metabolic caption and the additional information can be displayed in the entire effective screen area. The caption area 702 ends at the scanning line 240 starting from the scanning line 41 when viewed in field units of the NTSC TV signal, and thus has a height corresponding to 200 TV scanning lines per field. 10 character lines are all displayed in the entire caption area. The width of the caption area is set to 80 to 85% of the effective scan line width (52.6 uscc). Therefore, the width of all character lines is 80 to 85% of the effective line width.

Since the display cells of Korean, English, and Chinese characters are all composed of 20 bitmaps in the vertical direction, one character line (Row) composed of Korean, English and Chinese characters is composed of twenty TV scanning lines in order to facilitate the implementation.

In each row, the most recent Korean character, which can be displayed in the horizontal direction, is set to 18 characters. The width of one alphabetic letter is half of the width of one alphabetic character, so the maximum number of alphabetic characters that can be displayed on each row is 36. The Romanian language, Arabic numerals, and punctuation marks are the same as in English.

Since the width of one character is the same as the width of one character in Korean, the maximum number of Chinese characters that can be displayed per line is 18 characters.

All characters supported by the KSC5601 code may be mixed and displayed.

If mixed, a minimum of 18 characters and a maximum of 36 characters can be displayed per line.

Referring to FIG. 8, when characters are displayed on the screen, an area occupied by only one character per se is taken as character cells (804, 814, and 824) without considering the spacing between characters on the screen, An area occupied by one character is called a display cell 802, 812, or 814.

The character cell 804 of one-syllable Hangul character to be displayed on the screen in the receiver has a bitmap shape of 16 horizontal and 16 vertical. Therefore, Hangul which is to be entered into the character cell is read from the ROM in which the bitmap fonts of the width 16 and the width 16 are stored.

8A, the display cell 802 of one syllable Hangul considering the spacing between characters on the receiver side has a bitmap shape of 18 horizontal and 20 vertical. This is for spacing one space from the Hangeul character cell 804 in the upper, left, and right directions, and considering the case where the underline area 806 is set with an interval of one space below, To allocate additional cells.

The receiver display specification of GANA in Japan is the same as Hangul.

8B, the character cell 814 of the Chinese character to be displayed on the screen in the receiver has a form of a bit map (width 17, length 19). The size specification of the Chinese character cell 814 is provisional and may be set to a character cell of a different size (width 16, length 16) in consideration of conditions on the font ROM and the receiver circuit thereafter.

The display cell 812 of the Chinese character considering the spacing between characters on the receiver side has a bitmap shape of 18 horizontal and 20 vertical. This is to place a space one character to the right of the Hanja character cell (814) down one space. Unlike Hangul or English, it does not underline the kanji character.

Therefore, the width and the height of the Chinese character display cell 812 are the same as the width and height of the single syllable character display cell 802, so that one Chinese character has the same size as one Korean character.

Referring to FIG. 8C, the character cell 824 of the English alphabet to be displayed on the screen of the receiver has a bitmap shape of 8 horizontal and 14 vertical.

The alphanumeric display cell 822, taking into consideration the spacing between characters on the receiver side, has a bitmap shape of 9 horizontal and 20 vertical. This is to place two spaces upward and one space to the right from the English alphabet letter cell 824 and two spaces below the alphabet letter cell 824 in order to set an underline area 826 with an interval of two spaces In order to allocate additional margins.

Therefore, since the width of the alphabetical display cell 822 is 0.5 times as wide as the width of the syllable display cell 802 of the syllable, and the height is the same, one Korean character has a size corresponding to two alphabetic characters.

The receiver display specification of punctuation marks including Roman numerals and Arabic numerals other than English and space characters between words is the same as English.

In the receiver, the character display processing method in the display cell may be either opaque background processing or shadowed edge processing according to the 'background color designation' control code, and the opaque background may be displayed as a translucent background.

When the receiver displays characters using an opaque background processing method, it may facilitate reading by processing the immediately preceding portion of the first character and the latter portion of the last character in each line as an opaque background having a size of one syllable Hangeul character .

The control function of FIG. 5 set by the above-described control code will be described in more detail as follows.

The control code consists of a combination of two 9-bit words. LSWord contains bits D1, D2, and D3 for function classification. MSWord contains D9, D10, D11, and D12 bits .

The control codes are classified into color designation, attribute designation, display control, scrolling, cursor movement, row position and column positioning control codes according to their functions.

The color specification control code is a control code transmitted to change the foreground and background color of character data to be transmitted. Therefore, if you want to change the foreground and background of the text you want to send, you can send text after sending the color designation code. The receiver determines the foreground and background colors by the most recently received color control code. Also, foreground and background colors can be changed simultaneously or independently. The background color is Transprent, the image of the program should be displayed in the rest of the display cell except for the character, and the color of the character in each character should be displayed in black, red, magenta, blue, cyan, green, You should treat the outline in a different color.

The character property control code is a control code transmitted to change the attribute of character data. Therefore, if you want to change the attribute of the character you want to transfer, you can send the character code after sending the attribute specification control code first. You can specify normal, underline, flicker, and inverse, since underline, flicker, and inverse are independent, all of these properties can be applied at once.

The function of each attribute-specified control code is as follows.

/ `Underscore: Indicate underline immediately below each character to be displayed.

/ `Blinking: causes the character to blink. The previously displayed portion does not blink, the next displayed portion blinks, and the blink period depends on the implementation of the receiver.

/ `Inverse: Changes the foreground and background colors currently used by the receiver.

/ `Normal: Display the character with the default attribute by resetting all the already specified attributes.

Display Method The control code is a control code transmitted to control the screen display method, and it can designate the screen display, screen erase, reception save, horizontal write, and vertical write.

/ `Display: Display the received problem data directly on the screen (Roll-up, Roll-down) or display the data stored by the 'Receive Storage' control code on the screen.

/ `Save Receive: Save received characters and control codes until the screen is displayed.

/ `Horizontally: Move the next character position to the right of the current character when displaying consecutively received character codes on the screen continuously without intervention of the position change control code.

/ `Vertical write: Move the next character position to the bottom of the current character when continuously displaying the character code continuously received without the intervention of the position change control code.

The scroll control code is a control code for scrolling the screen by defining a certain portion of the caption area. The scroll control code includes '2 to 5 line roll-up' and '2 to 5 line roll-down'.

/ `2 ~ 5 lines Roll-up: Control code for scrolling the contents of the window one line up in the window consisting of 2 ~ 5 lines upwards including the current character display position (cursor position) The top row of rows disappears with scrolling and the bottom row is replaced by the most recently decoded characters. When using this control code, there is no need for a separate APDR (go to the first character position below) code, and all characters outside the specified window are cleared from the screen.

/ `2 ~ 5 lines Roll-down: A control code for scrolling down one line of the window contents in a window consisting of 2 to 5 rows downward including the current character display position (cursor position) The bottom row of the inner rows disappears with scrolling and the top row is replaced with the most recently decoded characters. When using this control code, there is no need for a separate APUR (go to first character position) code, and all characters outside the specified window are supported on the screen.

The scroll function is not used for displaying additional information.

The position movement control code is a control code relating to the movement of the position at which the character is displayed.

/ `APF (Active Position Forward): When writing horizontally, it moves the writing character by one half width of Korean character (width of 1 alphabet) in the main progress direction (right). When writing vertically, it moves in the main proceeding direction (downward) by the Chinese character height.

/ `APB (Active Positionackward): When writing horizontally, write letters. Move in the opposite direction (left) by one half of Korean characters (width of one alphabet). When vertical writing is performed, it moves in the opposite direction of main progression (upper side) by the Chinese character height.

/ `APDR (Active Position Down Return): Moves to the leftmost character position (first column position) immediately below the current character display position in horizontal writing. At the time of vertical writing, the character is moved to the top character position (first row position) in the immediately left column of the current character display position. Move in the main direction (downward) by the Chinese character height.

/ `APUR (Active Position Up Return): Moves to the leftmost character position (first column position) immediately above the current character display position in horizontal writing. At the time of vertical writing, the character is moved to the top character position (first row position) in the immediately right column of the current character display position.

/ `3 ~ 6 characters APF: APF of 3 ~ 6 characters width is used for horizontal writing. When vertical writing is performed, the APF of 3 ~ 6 characters is executed.

Exceptions to position movement control are as follows. APDR, APB, 2 ~ 5 line roll-up, 2 ~ 5 line roll-down, etc. when characters are displayed up to the rightmost character position When a character code is received without an associated control code, the character is displayed by moving to the leftmost character position (first column position) of the line without changing the line. However, if the character code at this time is a space code, it should be ignored until it receives a character code that is not a space code. APDR, APB, 2 to 5 line roll-up, 2 to 5 line roll-down, etc. when characters are displayed up to the bottom character position (10th line position) When the character code is received without the character string, the character is displayed by moving to the position of the top character (first line position) of the column without changing the column. However, if the character code at this time is a space code, it should be ignored until it receives a character code that is not a space code.

The transmission of control codes according to the screen display method is as follows.

(Control code) + string + (other control code) + clear screen + view screen + receive save + (other control code) + string + (other control code) + Clear screen + Follows the order of screen display. In order for the receiver to properly view the character information currently being displayed in the pop-on manner, a proper delay time is required before the sender sends a screen clear control code.

(Control code) + string (other control code) + string + (2 to 5 lines roll-up) + screen display + (other control code) + string + (Other control codes) + string + (2 to 5 lines roll-up). 2 ~ 5 lines Roll-up Whenever control code is received, the outer area of the window should be cleared to transparent color.

(Control code) + string (other control code) + string + (2 to 5 lines roll-down) + display view + (other control code) + string + (Other control codes) + string + (2 to 5 lines roll-down). Each time the roll-down control code is received, the outer area of the window must be cleared to transparent color.

The processing of the control code at the time of vertical writing is as follows.

When the receiver decodes the vertical write control code, the direction of the Hangul characters displayed on the screen is switched to the column direction.

Vertical writing is mainly used when captions are already present in the broadcast contents. The structure of the character cell at the time of vertical writing does not have to be the same as the character cell of each character at the time of the horizontal writing. Referring to FIG. 9, the size of display cells of all kinds of characters in vertical writing must be the same regardless of the size of character cells of each character. For example, in vertical writing, considering the inter-character spacing, the entire area occupied by the alphabet 1 character on the screen should be the same as the entire area occupied by the 1 syllable character. When font data at the time of horizontal writing is used, the width of the English character cell is half of the width of the one-syllable Hangeul character cell. Therefore, when alphabetic characters at the time of vertical writing are displayed, To be included in the right half of the Hangul character cell. In the case of vertical writing, since the underline position by the underline designation is to the right of the character cell, the structure of the display cell is different from that of the horizontal writing, which can be determined depending on the field of view of the receiver. However, in vertical writing, the display cell must be large enough to contain character cells of all characters.

In vertical writing, it is desirable to reconfigure the character matrix structure in the caption area because the column spacing is wider than the line spacing so that it is easy to read. That is, the number of columns displayed on the receiver at the time of vertical writing is set to 16 in order to widen the column spacing, and the number of displayable characters per column is 10. In vertical writing, all kinds of characters have the same size of character cells, so if you display the characters on the whole screen, the character matrix structure is 10 rows x 16 columns. This subtitle area should be the same as the width of the subtitle area at the time of horizontal writing and the height should be smaller or equal. Therefore, the column spacing at the time of vertical writing becomes larger than the column spacing at the time of the horizontal writing, and the row spacing becomes smaller or equal, so that the vertical reading can be made easier. The column spacing should be equidistant.

The receiver's default position is set to the first character position in column 16 when no special position control code is received at vertical writing.

The direction of the active position of the cursor movement control codes (APDR, APUR, APF, APB, and n-APF) in vertical writing is determined based on the vertical column which is the character progressing direction. That is, Down = Left, Up = Right, Forward = Down, Backward = Up. APDR is defined as a control code for moving to the top character position (first row position) of the immediately left column, APUR is defined as a control code for moving to the top character position (first row position) .

2 ~ 5 lines of vertical writing roll-up scroll the window contents to the right side of the screen by one column inside the window composed of 2 ~ 5 right vertical columns including the character display position (cursor position) , The rightmost column among the jobs in the selected window disappears with scrolling and the leftmost column is replaced with the most recently decoded string. When using this control code, there is no need for a separate APDR code (move to the top character position of the left column in vertical writing) code, and all areas outside the 2-5 column window are cleared in transparent color. Roll-down 2 ~ 5 lines when writing vertically Scroll window contents one column to the left of the screen inside the window composed of 2 ~ 5 left new columns including the current character display position (cursor position) , The leftmost column among columns in the selected window disappears with scrolling and the rightmost column is replaced with the most recently decoded characters. When using this control code, there is no need for a separate APUR (move to the top character position of the right column in vertical writing) code, and all areas outside the 2-5 column window are cleared in transparent color.

The control code for additional information is as follows.

Since the additional information transmits the page unit code, the 'page start' and 'page end' control codes for page processing are required. 'Start page' interprets the '2-line roll-up' of the subtitles and 'End of page' interprets the 2-line roll-down of the subtitles as the corresponding code.

/ `Start page: Indicates the start of one page of additional information, and the receiver starts storing one page upon receipt of this code. If you do not receive this code at the beginning of the page, all data on this page will be ignored.

/ `End of page: Indicates the end of one page of additional information, and the receiver, upon receipt of this code, displays the data of the page already received on the screen.

When wrapping additional information, one of the codes APDR, APUR, and column positioning control code must be transmitted.

Before displaying one page of additional information data on the screen, it is necessary to erase the screen with the background color of the page to be displayed, so a background color of one page unit is required. The background color code immediately after the 'page start' code is set as the page background color. If the background color code does not come immediately after the 'page start' code, the background color of the previous page is set as the page background color.

Ignore vertical writing because it is intended for cases where there is a subtitle at the bottom such as news. I also ignore '3 to 5 line roll-up' and '3 to 5 line roll down'.

The validation code is identified and processed as follows.

The procedure and process for decoding the subtitle signal at the receiver to determine the valid code follow the following sequence of numbers.

D7 and D16 must be the same to determine a valid code.

D17 and D0 1s D1 1s D2 1s D3 1s D4 1s D5 1s D6 1s D7 1s D8 1s D9 1s D10 1s D11 1s D12 1s D13 1s D14 1s D15 1s If D16 is the same,

D5 and D6 are respectively (0, 0) and D14 and D15 are respectively (0, 0), the control code is determined.

If D5 and D6 are (0,1) or (1,0) or (1,1) respectively and D14 and D15 are respectively (0,1) or (1,0) or (1,1) .

D5, D6, D14 and D15 are respectively (0, 0) and the other is (0,1) or (1,0) or (1,1), the control code and the character code are simultaneously received Since there is no case, this code judges as an error.

In case of discrimination by letter code in the previous number, D8 and D0 1s D1 1s D2 1s D3 1s D4 1s D5 1s D6 1s D7 are judged to be the same and judged to be different if they are different.

If it is judged not to be an error in the above, it is checked whether it is a character code defined in 1sKSC5601, and if it is an undefined code, '?' Or ''. If the code is defined, the corresponding character is displayed on the screen.

When it is judged as a control code in the above code, whether or not D0 and D1 1s D2 1s D3 1s D9 match and D4 and D1 1s D2 1s D11 1s D12 are checked in LSWord and it is judged as an error if at least one does not match .

If it is determined in the above step that it is not an error, it is determined whether it is defined in the control code table of FIG. 5, and if it is an undefined code, it is determined to be an error.

If the control code defined in the above table is the control code, the same LSWord and MSWord are waiting for repeated transmission.

When the same LSWord and MSWord are repeatedly transmitted, the control code is applied.

The above-described effective code discrimination and processing will represent the most preferable embodiment, and similarly, modification can be performed. For example, you can hear different combinations of parity of control codes, and so on. In particular, various schemes for preventing the error of the control code can be employed.

The operation and effect of the present invention described above will be described as follows.

The combination of the above-described control code and character code allows the screen display type to be operated in three ways: a metabolic film scroll display method, a metabolic caption pop-on display method, and an additional information display method. In the present invention, do.

The pop - on function is mainly used to display the dialogue in the place of the actor in case of drama.

10, in the pop-on display method of the receiver of the present invention, it is checked whether the pop-on mode is set (1002), and when the pop-on mode is set, the presence or absence of the "receive storage" control code among the received control codes is checked 1004). When the "reception / storage" control code is detected, subtitle information, i.e., meta information and control information, which are received later, are stored in the reception buffer (1006). The control information includes a pop-on display position control code, subtitle character color specification control information, subtitle background color specification control information, and the like. Then, a "clear screen" control code is received after a predetermined period of time, that is, a time period sufficient for the viewer to read the dialogue being displayed, is received. Whether or not the control code is received is checked (1008) The displayed subtitle is deleted with a transparent background color (1010). Then, it is checked (1012) that the "display" control code is received, and the metabolic film stored in the reception buffer is pop-on displayed on the screen (1014). Thus, pop-on display can be achieved in one reception buffer by storing the metabolism subtitle information in the reception buffer by the " reception storing "control code and pop-on the metabolism film stored in the reception buffer by the" display "control code.

For example, the transmission code column <receive storage - receive storage - second row - second row - yellow letter - yellow letter - second column - second column - transparent base - transparent base - -? - 6 - character APF - 6 - character APF - Korean - English - Korean - Korean - English - Korean! Pop-on display is performed as shown in FIG. 11, and then a transmission code string <reception store-reception-save-second row-display> Second row - Yellow letter - Yellow letter - Second column - Second column - Transparent background - Transparent background - - What? - The third row - The third row - The second column - The second column - The room - The space - I - The do - mola - The fourth row - The fourth row - The second column - The second column - The screen is displayed as shown in FIG. 12 when it receives the &quot; screen-erase-erase-erase-erase-screen erase-erase-screen-erase-screen>. Subsequently, in the case where there is no subtitle subtitle, the transmission code sequence <5 seconds and -screen deletion-screen deletion> is received and the subtitle subtitle is erased.

As described above, in the pop-on mode, since the metablock can be displayed in real time in response to the control code by using one reception buffer, the memory capacity of the reception buffer can be reduced and the cost of the reception apparatus can be reduced The effect can be obtained.

Claims (5)

A pop-on display method of a receiving apparatus for receiving a viewer selectable caption broadcasting in which caption information is inserted into any one horizontal line which does not affect a broadcasting signal for every field of a television broadcasting signal, A first step of extracting a caption signal from a received television broadcast signal; A second step of detecting a "received and stored" control code in the caption signal extracted in the first step; A third step of storing the received meta information and control information received in response to the " received "control code detected in the second step in a reception buffer and detecting a" display "control code in the extracted caption signal; And a fourth step of pop-on-displaying the metabolism subtitle of the metabolism information stored in the receiving buffer when the "view" control code is detected in the third process. Way. 2. The apparatus of claim 1, wherein the control information stored in the reception buffer comprises: And color information of the meta information, background color information, and display position information. The method of claim 1, wherein the fourth step comprises: Further comprising the step of erasing the display portion of the dialog subtitle in a transparent background color in accordance with the "clear screen" control code received and detected prior to the "view" control code. The method according to claim 3, wherein the step of erasing the display portion of the dialog subtitle in a transparent background color in accordance with the "clear screen" control code comprises: And a "clear screen" control code is detected after a lapse of a time sufficient to sufficiently view the metabolic subtitle displayed on the screen. The method of claim 1, wherein the third step comprises: And a step of erasing the metabolic subtitle displayed on the screen when the "clear screen" control code is detected without receiving the metabolic subtitle following the preset predetermined time period. Way.