KR0164736B1 - Words code transmission and receiving apparatus, method using one channel for viewer selecting caption broadcasting - Google Patents

Abstract

The present invention relates to a method of transmitting and receiving supplementary information using a caption subtitle channel of a viewer-selective closed caption broadcasting. In the case of the dialogue subtitle information, the character data corresponding to the dialogue subtitle code is read from the font ROM, converted into a video signal, and then output on the screen. If the written character information is additional information, character data corresponding to the additional information code is read from the font ROM and stored in the display RAM.

Therefore, in the present invention, the remaining time after transmitting the metabolic information can be used to transmit separate information irrelevant to the program.

Description

Apparatus and method for transmitting and receiving text codes using one channel of viewer-selective caption broadcasting

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

2 is a block diagram showing the configuration of a television receiver for receiving viewer-selective closed captioning according to the present invention;

3 is a signal configuration diagram showing a configuration of a caption 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 view for explaining a control code according to the present invention.

6 is a flowchart illustrating a method of transmitting a character code using one channel of viewer-selective closed caption broadcasting according to the present invention.

7 is a flowchart illustrating a method of receiving a character code using one channel of viewer-selective closed caption broadcasting according to the present invention.

8 and 9 are diagrams for explaining the screen display state in the additional information mode.

FIG. 10 is a view showing the occupied state of the subtitle code and the additional information code when the additional information is transmitted using the subtitle subtitle channel. FIG.

The present invention relates to an apparatus and method for transmitting and receiving a character code using one channel of a viewer-selective closed caption broadcasting. In particular, the present invention relates to a receiver that is configured to transmit additional information to a field where no subtitle subtitle information is input using one channel to a television signal. The present invention relates to an apparatus and method for transmitting and receiving character codes using one channel of viewer-selective closed captioning, in which subtitle caption information is output on a screen and additional information is stored in a display RAM.

The closed captioning method in television broadcasting includes an open caption method for superimposing news or notifications by the broadcaster's selection without supervising the viewer by superimposing a caption signal on the active section of the television signal, and a non-active section of the television signal. In other words, when a caption signal is transmitted in a vertical blanking section, there is a closed caption method in which a television screen and dialogue contents can be viewed as captions by a viewer's selection.

Closed captioning closed captioning has been implemented since 1978 in the United States for the hearing-impaired without the sign language, and is also very useful for foreign language learning.

US Pat. No. 5,294,982, published in March 1994, discloses a closed caption broadcasting method of Roman characters and syllable characters. In particular, the captioning method of Korean is explained in detail. In the invention of the U.S. patent, in order to broadcast the Korean language in a closed caption method, a Korean character is divided into each phoneme of a consonant, a neutral, and a consonant, and an ASC II code corresponding to each phoneme is transmitted, and the receiving device decodes the ASC II code. Korean characters are displayed by mapping the initial, neutral, and final characters.

In the conventional Korean closed caption method, at least 3 to 4 bytes are used to represent a Korean character, so the transmission speed and display speed are slow, and the decoding process requires a combination of 3 to 4 bytes to locate a character. There was a problem that the processing was complicated. The complexity of the decoding process raises the cost of the decoder. This causes a problem of increasing the cost of the decoder, which millions of viewers have to pay in comparison to the encoder that is required only by broadcasting stations.

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

In addition, since the control code is required to display the dialogue information in the middle of displaying the supplementary information and display the supplementary information again, there is no independence between the dialogue information and the supplementary information, and a control system for distinguishing the display mode of the dialogue information is provided. If the display mode control code is not received at the time when the receiver starts to operate, the metabolic information cannot be displayed until the next control code is received.

In addition, the above-mentioned invention was developed based on the television transmission environment of the United States, that is, the geographical environment with a lot of flat land. Therefore, in the geographical environment of Korea where the mountain area is 70% or more, the reception state of the receiver is poor and the quality of the caption display is pointed out. If only the metabolic subtitle information is transmitted using one channel, a field without the metabolic subtitle is processed as an empty field.

An object of the present invention is to solve the problems of the prior art as described above. In particular, a character code using one channel of a viewer-selective closed caption broadcasting to carry and transmit metabolic subtitle information and additional information per field using one channel is transmitted. To provide a transmitting and receiving apparatus, a method.

In order to achieve the above object, the present invention provides a metabolic information input for inputting metabolic information in a viewer-selectable subtitle transmission apparatus which inserts and transmits subtitle information in one horizontal line which does not affect a broadcast signal in every field of a television signal. Way; Additional information input means for inputting bookkeeping information; Metabolic information detection means for detecting the presence or absence of metabolic information output from said metabolic information input means; Switching means driven by a signal output from the metabolic information detecting means to output metabolic information or additional information; Code generating means for transcoding the information output from the switching means; And transmitting means for combining the converted character code with a video signal for every field and transmitting the synthesized code.

A transmission method according to the present invention comprises the steps of: inputting dialogue information in a viewer-selective caption transmission method in which subtitle information is inserted and transmitted in one horizontal line which does not affect a broadcast signal in every field of a television signal; Inputting additional information; Increasing the presence or absence of the metabolic information; Transcoding the metabolic information if there is the metabolic information and transmitting the metabolic information every field; And transcoding the additional information, which is already input and stored if there is no metabolic information, and transmits it for each field.

The receiving apparatus of the present invention is a receiver of a viewer-selective caption broadcasting which inserts and transmits subtitle information in one horizontal line which does not affect the broadcast signal in every field of the television signal, and is output from the analog / digital conversion means. Caption control means for determining whether the value is metabolic information or additional information; A metabolic information memory for storing metabolic information output from the subtitle control means; An additional information memory for storing additional information output from the subtitle control means; Command input means for inputting a caption-related command to the television system; And a system control means for outputting a subtitle-related command output from the command input means to the subtitle control means.

In addition, the receiving method of the present invention is a receiving method of a viewer-selective closed caption broadcasting in which subtitle information is inserted and transmitted in an arbitrary horizontal line which does not affect the broadcast signal in every field of the television signal. Checking whether it is information; Storing the metabolic information in a memory if the character code is metabolic information; If the character code is additional information, storing the additional information in a memory; Checking a mode input from the command input means; If the input mode is the metabolic information mode, reading character data corresponding to the metabolic information stored in the memory from the font ROM and displaying the text data on the screen; And if the input mode is the additional information mode, character data corresponding to the additional information stored in the memory is read from the font ROM and displayed on the screen.

Hereinafter, with reference to the accompanying drawings will be described in more detail the present invention.

1 shows a configuration of a television broadcasting apparatus having a viewer-selectable closed captioning function. The audio signal input through the microphone 10 is mixed and amplified by the voice signal processor 30 and transmitted to the television signal modulator 50 of the transmitter 80. The video signal input through the video camera 20 is amplified and edited by the video signal processor 40 and transmitted to the television signal modulator 50. The television signal modulator 50 FM-modulates the transmitted audio signal, AM modulates the video signal of the residual side-wave method, and frequency-multiplexes and shifts the AM modulated signal and the FM modulated signal. The high frequency output unit 60 amplifies a high frequency signal and transmits a television signal to the air through an antenna.

The metabolic information is input through the metabolic information input unit 90, and the additional information is input in advance through the additional information input unit 92.

Then, if there is metabolic information output from the metabolic information detector 94, the metabolic information is input from the code generator 79 by connecting the switching unit 96 to the metabolic information input unit 90 and inputting the metabolic information to the code generator 79. Generate the code.

In addition, if there is no metabolic information in the metabolic information detection unit 94, the switching unit 96 is connected to the additional information input unit 92 so that the code generator 79 generates an additional information code for the additional information.

In the caption encoding unit 70, additional information such as dialogue information or urgent news or delivery information related to a television screen is input through the character information input unit 71 of the code generator 79. Various control information for subtitle control is input through the control signal input unit 72. The character information input unit 71 includes a keyboard for inputting characters such as Korean, English, Chinese characters, Japanese, and special characters, and outputs the input character information as a two-byte Hangul completion 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 as a 7-bit binary code.

The character code generation unit 73 uses the MSB of each byte of the input two-byte character code as the subtitle / additional information flag, and replaces the MSB with '1' in case of additional information and adds a parity bit to each byte. A data packet of a total of 18 bits of character code is generated.

The control code generator 74 divides the input 7-bit binary into the upper 4 bits, lower 3 bits, and adds a parity bit for the upper 4 bits, a control code identification bit for 2 bits, and a dialogue / addition flag to generate an upper byte. A lower byte is generated by adding a first parity bit, a second parity bit, a control code identification bit of two bits, and a subtitle subtitle / additional information flag for the lower three bits. A parity bit is added to each generated byte to generate a data packet having a total of 18 bits of control code. Details of the above-described data packet will be described later.

The data packet modulator 75 modulates the data packet generated by the character code generator 73 or the control code generator 74 by a digital modulation method.

The sync counter 76 inputs the sync signal provided from the video signal processor 40, resets by the vertical sync signal, counts the horizontal sync signal, and counts the scan players. The window signal generator 77 inputs the count value of the synchronization counter 76 to generate a window signal. The window signal is a drive signal for switching the switching means 78 to superimpose the caption signal on a predetermined specific line of the video signal output from the video signal processor 40.

Referring to FIG. 2, there is shown a configuration of a television receiver for receiving viewer-selective caption broadcasting.

The tuner 110 demodulates a television signal of a channel selected from the high frequency signals received by the antenna and outputs a voice signal and a video signal. The voice signal is transmitted to the voice signal processor 120 to be equalized and amplified and output as voice through the speaker 130. The video signal is transmitted to the video signal processor 140, processed for luminance and color, 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 transmitted RGB signal to display a television screen on the screen.

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

The caption processor 230 generates a clock signal synchronized with the color burst signal of the video signal processor 140 to extract the caption data packet from the digital signal. The extracted data packet is decoded to control caption processing in response to the decoded control code, and the character data is read from the font ROM 240 in response to the decoded character code and stored in the display RAM 250. Character data stored in the display RAM is converted into an RGB signal and transmitted to the mixer 150. The caption processing unit 230 exchanges control data with the system control unit 180 of the set. The system controller 180 transmits a caption-related command input through the command input unit 19 to the caption processing unit 230 and controls the system in response to the control data transmitted from the caption processing unit 230.

The display RAM 250 includes a metabolic information memory 252 for storing metabolic information output by the caption processing unit 230 with respect to a character code input from the analog / digital converter 210 and the caption control unit 230. And additional information memory 254 for storing additional information output by the check.

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

In Korea, M-NTSC TV signal of 525 lines and 60 fields / sec is used as a broadcast signal, and the vertical blanking period is specified from scan line 10 to scan line 20.

There are no standards set by the Ministry of Information and Communication on the use of signals in the vertical blanking period. For reference, ITU-R Recommendation Rec 473-2 and US FCC Report and Order 83-120.

The caption signal may use one of the scan lines 10-20, the scan line 21, or the scan line 262 in the vertical blanking period for transmission of the caption data. One or more may be used for increased data transfer or for other purposes. However, full-field data transmission is not considered in closed captioning.

The transmission bit rate of closed caption data should be 447443.125 bps ± 125 bps, and the maximum long-term change rate should be within ± 196 (0.0125 bps). ± 10 Hz), which should be frequency synchronized to the color burst. It is preferable that the color carrier carrier has a continuous phase between the scan line and the scan line. If the phase of the color carrier is discontinuous due to screen editing, etc., at least phase synchronization should be performed on the color burst of the scan line.

In the data modulation method, the one corresponding to the logic value '1' is represented by a sine wave of one period having a phase of 0 degrees and the frequency of fsc / 8 (447.443 kHz), and the phase corresponding to the logic value '0' is 180 degrees. A digital modulation scheme called Binary Phase Shift Keying (BPSK) or Phase Reversal Keying (PRK), which is represented by a period of sinusoids having a frequency of fsc / 8 (447.443 kHz). The maximum range of phase jitter is ± 10 degrees. The optimal signal waveform will be defined in the future as it may vary depending on the frequency spectrum characteristics of the TV channel. However, due to the fundamental band-limiting frequency, the BPSK type may experience severe distortion where logic transitions occur, and then use a phase-corrected waveform for broadcast after passing a second-order Butterworth filter with a cutoff frequency of 3.5 MHz. Shall be. The impulse response of the Butterworth filter used is

Among inspection items of radio station, number I-7 (TV station), item 4 (text multicasting) b) (superposition position of data line and amplitude of text signal) defines the test method and basis.The waveform of caption signal is not NRZ. Since it is a pure sinusoidal wave, it is not necessary to apply the above criteria. However, in order to expand the coverage area, which is 70% or more like Korea, the maximum sinusoidal wave is 90 ± 5 IRE. Although the maximum amplitude of the normal data signal is defined, the overshoot may be included due to filter passband characteristics, so the maximum value of the overshoot is 5 IRE.

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

The bit clock synchronization signal 302 is a six-cycle sinusoidal signal that can be extracted by the caption decoding unit and used to read a bit period of 18-bit data. The frequency is fsc / 4 (894.886 kHz). If the phase of the color carrier of the scan line is 0 degrees, it starts at the point 9.5usec (34 bursts of color burst) from the falling edge (0H) of the horizontal synchronization signal, and the phase of the color carrier of the scan line starts. If it is 180 degrees, it starts at the point of 9.64usec (34.5 cycles of color burst) from the middle edge (0H) of the falling edge of the horizontal synchronization signal. Since this signal is in frequency synchronization with the color burst of the corresponding line, it is also possible to extract the bit clock synchronization signal from the color burst.

The word start signal 304 is fsc / 16 (223.722 kHz) and is a period of a standing wave signal having a phase of 180 degrees, which serves to indicate the start of an 18-bit data packet.

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

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

Referring to FIG. 5, the control code is a combination of two 9-bit words. LSWord includes D1, D2, and D3 bits for function classification, and MSWord includes D9 for selecting one of the classified functions. , D10, D11, and D12 bits are included.

Control codes are classified into color designation, attribute designation, display control, scrolling, cursor movement, action value and column positioning control code according to their function.

The color designation control code is a control code transmitted to change the foreground and background colors of the transmitted character data. Therefore, if you want to change the foreground and background of the character to be transmitted, you can send the character after transmitting the color specification code. The receiver sets the foreground and background colors by the most recently received color control code. In addition, the color of the foreground and background can be changed simultaneously or independently. Colors are black, red, magenta, blue, cyan, green, yellow, white, and the background color is a transprent. The video of the program should be shown in the remaining parts of the display cell except for the characters. You need to outline it with a different color.

The character attribute control code is a control code transmitted to change the attribute of character data. Therefore, to change the attribute of the character to be transmitted, send the character code after sending the attribute designation control code first. You can specify Normal, Underline, Blink, and Inverse. Underlining, Blink, and Inverse work independently, so all of these attributes can be applied at once.

The function of each attribute designation control code is as follows.

▷ Underline: Underline it to display just below each character to be displayed.

▷ Blinking: The character to be displayed blinks. The previously displayed part does not blink, the later displayed part blinks, and the blink period varies depending on the receiver implementation.

▷ Reversed: The foreground and background colors currently used by the receiver are swapped.

▷ Normal: Displays the character as a default attribute by resetting all attributes already specified.

Display method The control code is a control code transmitted to control the screen display method. The display code, screen erase, receive storage, horizontal writing, and vertical writing can be designated.

▷ Display: Display received text data on the screen (in Roll-up, Roll-down) or display data saved by 'receive save' control code on the screen (when pop on).

▷ Save Receive: Save received character and control code until screen display.

▷ Horizontal writing: When displaying the character code that is received continuously on the screen without intervention of the position control code, move the next character position to the right of the current character.

▷ Vertical writing: When displaying the character code that is received continuously on the screen without intervention of the position change control code, move the next character position to the bottom of the current character.

The scroll control code is a control code for scrolling the screen by selecting a certain portion of the subtitle area, and the scroll control codes include '2-5 line roll-up' and '2-5 line roll-down'.

▷ 2 ~ 5 lines Roll-up: Control code for scrolling the window contents by one line up within the window composed of 2 ~ 5 lines in the upper direction including the current character display position (cursor position). The top of the lines disappears with scrolling and the bottom is replaced with the most recently decoded characters. This control code eliminates the need for a separate APDR code, and removes all characters outside the specified window.

▷ 2 ~ 5 lines Roll-down: Control code for scrolling the window contents down one line in the window consisting of 2 ~ 5 lines in the downward direction including the current character display position (cursor position). Of the rows of, the bottom row disappears with scrolling and the top row is replaced with the most recently decoded characters. When using this control code, no separate APUR code is required, and all characters outside the designated window are deleted from the screen.

The scroll function is not used to display the additional information.

The position movement control code is a control code relating to the direction movement of a position to display a character.

▷ APF (Active Position forward): When writing horizontally, move one half of Korean letter (width of one English alphabet) in the main writing direction (right). When writing vertically, the height of Hangul kanji moves in the main direction (bottom).

▷ APF (Active Positionackward): When writing horizontally, the letter is moved half the width of Korean characters (1 width of English alphabet) in the opposite direction (left). In case of vertical writing, the height of Hangul kanji moves in the opposite direction (upward).

▷ APDR (Active Posieion Down Return): When writing horizontally, move to the leftmost character position (first column position) of the line just below the current character display position. In case of vertical writing, it moves to the top letter position (first row position) in the immediately left column of the current character display position. Moves the Hangul Hanja height in the main direction (bottom).

▷ APUR (Active Position Up Return): When writing horizontally, move to the leftmost character position (first column position) of the line immediately above the current character display position. In case of vertical writing, it moves to the top letter position (first row position) in the right column of the current character display position.

▷ 3 ~ 6 letters APF: When writing horizontally, APF should be 3 ~ 6 letters wide. In case of vertical writing, APF is executed as high as 3 ~ 6 letters.

The exception of position movement control is as follows. That is, in case of horizontal writing, when the character is displayed up to the rightmost character position (column position 18) of the line, it moves the appropriate position such as APDR, APUR, APB, 2-5 line roll-up, 2-5 line roll-down If 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 a character code other than a space code is received. In case of vertical writing, when characters are displayed up to the bottom character position of the column (line 10), control codes related to proper position movement such as APDR, APUR, APB, 2 ~ 5 line roll-up, 2 ~ 5 line roll-down If a character code is received without changing the column, the character is moved to the top letter position (first line position) of the column to display the character. However, if the character code at this time is a space code, it should be ignored until a character code other than a space code is received.

Transmission of control code according to screen display method is as follows.

The order of control code transmission during pop-on is reception storage + (other control code) + character string + (other control code) +… + Clear Screen + Show Screen + Receive Save + (Other Control Code) + String + (Other Control Code) +… + Freeze + show screen +… Follow the order. In order for the receiver to properly view the character information currently displayed in the pop-on method, a proper delay time is necessary before the transmitter sends the screen erasure control code.

As described above, the control code of the additional information for displaying the additional information on the television screen is as follows.

Since the additional information transmits a code of a page unit, 'page start' and 'page end' control codes are required for page processing. 'Page Start' interprets the 'Two-Line Roll-up' of the subtitles and 'Page End' interprets the 'Two-Line Roll-down' of the subtitles with the corresponding code.

▷ Page Start: It indicates the start of one page of additional information and the receiver starts to save one page upon receiving this code. If this code is not received at the beginning of the page, all data on this page is ignored.

▷ End of page: It indicates the end of one page of additional information and when receiver receives this code, the data of already received page is displayed on the screen.

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

Before displaying one page of additional information data on the screen, the background color of the page to be displayed must be cleared so that a background color of one page unit is required. The background color code immediately after the 'page start' code is used as the page background color. If the background color code does not come immediately after the 'page start' code, the previous page background color is used as the page background color.

Ignore vertical writing because it is intended for use with lower captions, such as news. It also ignores three- and five-row roll-ups and three- and five-row roll-downs.

FIG. 6 is a flowchart illustrating a method of transmitting a character code using one channel of a viewer-selective closed caption broadcasting according to the present invention. The step of inputting metabolic information and inputting additional information is performed. Performing the step of checking the presence or absence of the metabolic information, and transcoding the metabolic information if there is the metabolic information and transmitting it for every field; The step of transmitting every time.

7 is a flowchart illustrating a method of receiving a character code using one channel of a viewer-selective closed caption broadcasting according to the present invention, and performing a step of checking whether the received character code is dialogue information, and if the character code is dialogue information, Storing the information in the memory; if the character code is the additional information; storing the additional information in the memory; checking a mode input from the command input means; In the information mode, the character data corresponding to the dialogue information stored in the memory is read from the font ROM and displayed on the screen. If the input mode is the additional information mode, the character data corresponding to the additional information stored in the memory is displayed. Reading from the display and displaying it on the screen.

8 and 9 show embodiments of the screen display state in the additional information mode. Where S represents a space character. First, the transmission code string of the weather forecast is: Page Start-Page Start-Green Background-Green Background-Yellow Letter-Yellow Letter-Second Row-Second Row-Fourth Column-Fourth Column-{== S Diary SS Forecast S ==}-4th Row-4th Row-4th Column-4th Column-{Seoul S Sunny SS0 Degree}-APDR-APDR-6APF -6APF-{Daejeon S Cloudy SS2 Degree}-APDR-APDR-1st 4th column-4th column-{Gwangju S Cloudy SS4 Degree}-APDR-APDR-6APF-6APF-{Busan S Ratio SSS3 Degree}-APDR-APDR-4th Column-4th Column-{Daegu S Ratio SSS3 Degree} -APDR-APDR-4th column-4th column-{Chuncheon S-Eye SS-4 degree}-Page end- It consists of page end.

Where S represents a space character. Tomorrow's match code will be sent from page start-page start-row 2-row 2-row 4-row 4-APF-APF-{tomorrow game guide}-row 4-row 4- Row 2-Row 2-{Soccer-2: 00 PM (Suwon Football Field)}-APDR-APDR-{Basketball-4: 00 PM (Indoor Gymnasium)}-APDR-APDR-Row 2-Row 2-{Volleyball -10:00 am (Student Gym)}-APDR-APDR-{Table Tennis-11:00 am (Seoul University Gymnasium)}-APDR-APDR-{Baseball-5:00 am (Jamsil Baseball Stadium)}-APDR-APDR-Row 3- Column 3-{The above can be canceled due to weather conditions}-APDR-APDR-Column 2-Column 2-{Yes}.

FIG. 10 is a diagram showing the occupied state of the subtitle subtitle code and the additional information code when the additional information is transmitted using the subtitle subtitle channel. The control code, the character code, and the broadcast signal are carried together in one field.

At this time, the character code consists of the subtitle subtitle code and the additional information code. Since the subtitle subtitle information is only 20-30% of the total program, the remaining time, that is, the empty field where the subtitle subtitle is not loaded, is transmitted. Done. At this time, if the subtitle subtitle information is input, the channel occupancy of the additional information is terminated, so the subtitle subtitle information priority is applied.

In the case of multiple voices such as movies, two-language subtitles can be broadcast on odd and even field channels. In the case of broadcasting two languages using an odd field and an even field, determination of a language type in a receiver may be performed using a line number of KSC5601 to display an icon on the receiver. When the broadcasting operator broadcasts the first language and the second language subtitles, the broadcasting operator may display the logo for about one minute at the beginning of the program as in the case of the voice multiplexing.

The receiver must have two display memories to support the pop-on mode. Also, within 10 seconds after the last pop-on dialogue subtitle is displayed, if the 'screen erase' or 'show screen' control code is not received or a reception error occurs, the corresponding pop-on is forced at 10 seconds. You can also delete the subtitles.

In bilingual subtitle broadcasting, the receiver must indicate the language selected by the user. The receiver may display both languages by converting to an arbitrary position for a language that the user has not selected.

The receiver may change the opaque background into a semitransparent background at the user's choice.

It is recommended that the display of the additional information be displayed page by page in the handset. It can also be rolled up line by line by user selection.

When displaying additional information, the user may forcibly specify a transparent background.

If the user pauses the page display while displaying the additional information page, the second page is stored in the buffer and the data of all pages received from the third page until the pause is released is ignored. If the pause is not released for more than 15 seconds, the receiver may release it automatically. You can also display an icon indicating the pause status.

The character attribute specified in the additional information page must be normally received by the normal control code. If the end-of-page control code is received without receiving the error, the character attribute should be returned to the normal state.

If the data code continues to be received without the control code at the end of the page even after 10 lines in the additional information page (when APDR is received and the data code is received), it must move to the first letter position of the 10th line and continue to overwrite. However, specifying and writing row and column positions follows the rules of the general control code.

Since the receiver will not know when to operate, the broadcast operator must create a broadcast system that properly positions the code strings of the transmitters so that the control code for the display position can be broadcast once every four seconds. If you do not know the exact position and mode of operation after the receiver is activated, the receiver of the basic service regulations displays the received character code in the default position and operates. After receiving the control code every 4 seconds, the receiver deletes the existing display screen according to the new control code. It should work.

The broadcasting operator shall designate and transmit information not related to the dialogue information of the broadcasting program as an additional information code. At this time, a broadcasting system must be established to maintain the priority with the subtitles. Side information should be transmitted Cyclic. In addition, it is recommended to configure a page so that the information to be displayed on the screen can be divided by one screen when the additional information is used.

In case of broadcasting using the pop-on display method of the subtitle, the control code should be transmitted so that the subtitle display can be erased properly. That is, if there is no subsequent metabolic content (voice signal) after 5 seconds (depending on the amount of subtitle) after displaying the metabolism subtitle in one position, the screen erase control code is sent to clear the screen. It is good.

If the receiver does not know the exact position and operation after starting the operation, the received character code is expressed as the default display specification in the default position of each mode, and the horizontal writing / vertical writing designation code and the line / column positioning designation code are received every 4 seconds. Received clears the existing display and operates according to the new control code.

If the user changes the television channel when using the subtitles and additional information, the subtitle operation is canceled and only the normal television screen is displayed even if the subtitle signal is transmitted to the changed television channel.

When no special control code is received at the time the user selects the dialogue subtitle after turning on the receiver, the receiver maintains the attribute release status and immediately puts the white text of the black background in the first column position of the tenth row of the subtitle area in horizontal writing. Display.

The screen switching to the additional information mode is performed at the time of selecting additional information or at the reception of the first page start control code after selecting the additional information. If a special control code is not received at the time when the user selects the additional information after turning on the receiver, the text is displayed in white text on the black background from the first column position in the first row by horizontal writing in the attribute release state.

The receiver can store and display several pages with extra memory. Since there is a memory for the pop-on mode of the subtitle, the receiver can display at least one page and store the next page. When the additional information is displayed, a new page may be displayed after the contents of the entire screen are completely erased whenever the screen is changed.

At a minimum, the receiver can perform operations corresponding to the following functions through the remote control, and additional functions can be added.

Indication of receiving caption packet in field

Display caption sensitivity

Bilingual presence

Indication of receiving additional information

Metabolism subtitle on / off function

Additional information on / off function

Additional information page hold function

Additional item specification function

Bilingual Subtitle Caption Selection

Vertical write protection

As described above, in the present invention, in the additional information screen display method of the viewer-selective closed caption broadcasting, the time required for transmitting the actual metabolic information is only about 20% to 30% compared to the length of the entire program time. There is an effect that it is possible to transmit additional information irrelevant to the program.

Claims (4)

A viewer-selective subtitle transmission apparatus for inserting subtitle information into an arbitrary horizontal line that does not affect a broadcast signal in every field of a television signal, the method comprising: metabolic information input means for inputting metabolic information data; Additional information input means for inputting additional information data; Metabolic information detection means for detecting the presence or absence of metabolic information data output from said metabolic information input means; Switching means for driving the signal output from the metabolic information detecting means to output metabolic information data or additional information data; Code generating means for transcoding the data output from the switching means; And transmitting means for synthesizing the converted character code with a video signal for every field and transmitting the converted character code. A viewer-selective subtitle transmission method for inserting subtitle information into an arbitrary horizontal line which does not affect a broadcast signal in every field of a television signal, the method comprising: inputting metabolic information data; Inputting additional information data; Checking the presence or absence of the metabolic information data; Transcoding the metabolic information data if there is the metabolic information data and transmitting it every field; And transcoding the additional information, which is already input and stored if there is no metabolic information data, and transmitting the converted information for each field. In the receiver of a viewer-selective closed caption broadcasting in which subtitle information is inserted and transmitted on an arbitrary horizontal line which does not affect the broadcast signal in every field of the television signal, it is added whether the value output from the analog / digital conversion means is metabolic information data. Subtitle control means for determining whether the information data; A metabolic information memory for storing metabolic information data output from the subtitle control means; An additional information memory for storing additional information data output from the subtitle control means; Command input means for inputting a caption-related command to the television system; And a system control means for outputting a subtitle-related command output from the command input means to the subtitle control means. A method of receiving a viewer-selective closed caption broadcasting in which subtitle information is inserted and transmitted in one horizontal line which does not affect a broadcast signal in every field of a television signal, the method comprising: checking whether a received character code is dialogue information; Storing metabolic information data in a memory if the character code is metabolic information; Storing the additional information data in a memory if the character code is additional information; Checking a mode input from the command input means; If the input mode is a metabolic information mode, reading character data corresponding to metabolic information data stored in a memory from a font ROM and displaying the text data on a screen; And if the input mode is the additional information mode, character data corresponding to the additional information data stored in the memory is read from the font ROM and displayed on the screen. Receive method.