KR0169230B1 - Selective subtitle broadcasting method with dual metabolic subtitle transmission function - Google Patents

Abstract

The present invention relates to a viewer-selectable caption broadcasting, receiving apparatus, and method, and more particularly, to a caption broadcasting apparatus, a receiving apparatus, and a method for receiving a dual metabolism information, And if the mode is selected by the viewer after storing in the respective storage units, the character data of the corresponding mode is synthesized with the video signal and then output to the screen.

Therefore, in the present invention, it is possible to display not only the familiar English but also a variety of third-language foreign language information such as German and French, on a television screen when watching a movie.

Description

Selective subtitle broadcasting method with dual metabolic subtitle transmission function

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

FIG. 2 is a block diagram illustrating a configuration of a television receiver for receiving a viewer-selectable caption broadcast according to the present invention; FIG.

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

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

FIG. 5 is a view for explaining a control code according to the present invention; FIG.

FIG. 6 is a Korean language complete code table for explaining the configuration of a character code according to the present invention; FIG.

FIGS. 7 and 8 are diagrams for explaining a procedure for executing a viewer-selectable caption broadcasting and receiving method having a dual metabolism caption transmission function. FIG.

The present invention relates to a viewer-selectable caption broadcasting method having a dual metabolism caption transmission function. More particularly, the present invention relates to a method and apparatus for capturing caption information on a television screen The present invention relates to a viewer-selectable caption broadcasting having a dual metabolic caption transmission function for viewing a foreign movie while watching a foreign language ambassador caption.

In the television broadcasting, the closed caption broadcasting system includes an open caption system in which a subtitle signal is superimposed on an active section of a television signal to display urgent news and notifications by selection of a viewer without selecting a viewer, That is, when a caption signal is transmitted in a vertical blanking period, a closed caption system is provided in which the television screen and the contents of the dialogue can be viewed as captions by the 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 characters and voice 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 in a closed caption system, an ASCII code corresponding to each phoneme is divided into one phoneme, a neutral, and a longitudinal phoneme, and the receiver decodes the ASCII code, , The neutral character and the last character are mapped to display a Korean character.

In such a conventional closed captioned closed caption system, at least 3 to 4 bytes are used to represent Korean characters. Therefore, since the forward speed and the 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.

In addition, since the control code is required when displaying the metabolism information in the middle of the additional information expression and again displaying the additional information, there is no independence between the metabolism information and the additional information, and a control system for distinguishing the display mode of the metabolism 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 the above-described invention, since the television transmission environment of the United States, that is, the flat ground is developed based on a geographical environment, the receiving condition of the receiving apparatus is poor in the geographical environment of Korea where the mountain is 70% or more, When watching a movie, we only used the language that is familiar to us, such as English, in subtitling information in foreign countries.

It is an object of the present invention to provide a method and apparatus for transmitting and receiving various foreign language information, such as German or French, not only in English but also on a screen of a television The present invention provides a two-language ambassador caption broadcasting method of a viewer-selectable caption broadcasting.

According to an aspect of the present invention, there is provided a viewer-selectable caption broadcasting method for inserting and transmitting caption information on any one horizontal line not affecting a broadcasting signal for every field of a television signal, Checking whether it is information data; Receiving a count value of a synchronization counter; Determining whether a count value of the counter is an odd number; If the odd number is an odd number in the determination step, inputting the Korean alphabet information; Inputting a character code of a second foreign language to be input and inputting foreign language metabolism information when recognizing that the even field is an even number in the determination step; And a step of code-converting the metabolism information and synthesizing it with a video signal, and transmitting the synthesized information.

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

Fig. 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-shifts the AM modulated signal and the FM modulated signal and frequency-shifts them to generate a high- And the high-frequency wave 60 amplifies the high-frequency signal and transmits the television signal through the antenna to the notary public.

The subtitle encoding unit 70 inputs the Korean alphabet information and the foreign language metabolism information related to the movie subtitle through the character information input unit 71a of the character information receiver 71. Various control information for caption control are input through the control signal input unit 71b. The character information input unit 71a includes a keyboard for inputting characters such as Hangul, English, Chinese characters, Japanese characters, and special characters, and outputs the inputted character information as a 2-byte Hangul complete code (KSC5601). The control information input unit 71b 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 generation unit 71c uses the MSB of each byte of the inputted 2-byte character code as the metadata subtitle / additional information flag, and if the MSB is the additional information, the MSB is replaced with '0' and a parity bit is added to each byte Thereby generating a data packet of a total of 18-bit character codes.

The control code generating unit 71d divides the inputted 7-bit binary number into lower 3 bits of the upper 4 bits, adds the parity bit for the upper 4 bits, the control code identifying bit of 2 bits, and the flag for the metabolism / addition 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 74 modulates the data packet generated in the character code generating section 71c or the control code generating section 71d by a digital modulation method.

The sync counter 72 receives the sync signal provided from the video signal processor 40, is reset by the vertical sync signal, counts the horizontal sync signal, and counts the shot. The window signal generator 73 receives the count value of the synchronization counter 72 and generates a window signal. The window signal is a driving signal for switching the switching means 75 to superimpose a caption signal on a predetermined specific line of the video signal output from the video signal processing unit 40.

The odd field detector 76 detects whether the count value is even or odd by the count value of the synchronization counter 72 and drives the switching unit 79 when the odd number is the odd number, (71), a character code is generated with respect to the entered Korean alphabet information and synthesized with the video signal and transmitted.

When the count value of the odd field detector 76 is an even number, the switching unit 79 is driven so that the foreign language dialog information input unit 78 is connected to the character information generation unit 71, Generates a code and combines it with a video signal and transmits it.

Referring to FIG. 2, there is shown 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 signals are transmitted to the display composition unit 160 via the mixer 150 and the display driver 160 drives the CRT 170 in response to the RGB signals transmitted thereby to display the television screen on the screen.

The subtitle decoder 200 converts the video signal through the analog / digital converter 210 and transmits the digital signal to the subtitle processor 230. 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 character data from the font ROM 240 in response to the decoded character code, and stores the read character data in the display storage unit 250. Converts the character data stored in the display storage unit into an RGB signal, and transmits the 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 display storage unit 250 includes a Hangul dialogue information storage unit 252 and a foreign language dialogue information storage unit 254.

The subtitle control unit 230 checks the input data from the analog / digital converter 210 to determine whether the information is foreign language information or foreign language information, and stores the input information in the storage unit 252 (254) do.

Thus, the information stored in the storage unit 250 is read according to the mode selected by the command input unit 190, and the character data of the information of the information is read out from the font ROM 240 and outputted onto the screen.

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 transfer. However, since all field data transmission is not meaningful in closed caption broadcasting, it is not considered.

The caption data signal must be transmitted only for 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 447443.125bps ± 125 bps, ± 10 Hz), and the color burst is frequency-synchronized. 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 a phase of 0 degrees and a frequency of fsc / 8 (447.443 KHz), and the one corresponding to the logical value '0' And a digital modulation method called Binary Phase Shift Keying (BPSK) or Phase Rcvrcal 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 waveform will be defined in the future as it may vary depending on the frequency spectrum characteristics of the TV channel. 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 normal data signal is defined, the maximum value of the overshoot may be 5 IRE since it may include the overshoot due to the filter passband characteristics.

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

The bit clock synchronizing signal 302 can be used to extract a bit period of 18-bit data by extracting the signal from the subtitle decoder with a sinusoidal signal for 6 periods, and 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 (OH) of the horizontal synchronizing signal and the phase of the color subcarrier At 180 degrees, it starts at a point 9.64 usec (34.5 cycles of color burst) from the falling edge middle point (OH) of the horizontal sync signal. 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 indicate 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 stream 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 Weid, 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. And 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, which are 0 for the subtitle subtitle and 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 a 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, 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 are coloring intelligence, character attribute and roll-up function, display method and roll-down function, position shifting 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 the parity for D1, D2, D3, D4, D4 is the parity for D1, D2, D10, D11, and D13 is the parity for D9, D10, D11, D12.

In addition, the control code is transmitted twice consecutively for secure reception of data, allowing the transcode / horizontal write coded matrix positioning code to be transmitted almost periodically every four seconds. A detailed description of the control code will be given later.

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

In the present invention, since no ASCII code is 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 to AB row (Japan Kana), AC It is limited to the lines (Russian), AD lines (German), AE lines (French), B0 to C8 lines (Korean), and CA to FD lines (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 vocal hypertext. Among them, the ambiguous subtitles for the Korean language should use the odd field channel and the other foreign language 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 KSC5601.

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 dialogue that coincides with the voice signal is displayed in a caption form while covering only a part of the screen to be broadcasted.

Use only two or five lines of subtitles at a time, and use the method of scrolling, erasing, and rewriting the area to display a continuous 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 character information on the entire screen as in computer communication regardless of the broadcast contents. The scroll function is not used because it is displayed on the entire 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.

FIG. 7 is a view for explaining a procedure of a viewer-selectable caption broadcasting method having a dual metabolic caption transmission function, in which a viewer who inserts caption information into an arbitrary horizontal line which does not affect a broadcasting signal for every field of a television signal and transmits A method of selecting a caption broadcasting method, comprising the steps of: (S8) checking whether input data is metabolic information; (S10) receiving a count value of a sync counter; and (S20) (S30), recognizing that the odd field is an odd field in step S20, and inputting Hangul dialog information in step S20. If it is determined in step S20 that the even field is an even field, A step of inputting a character code of two foreign languages and inputting foreign language dialog information (S40), performing a code conversion of the metabolism information, (S50).

FIG. 8 is a diagram for explaining the procedure of receiving a caption selection broadcast with a dual metabolism subtitle transmission function, in which caption information is inserted into any one horizontal line which does not affect the breathing signal for every field of the television signal, (S21) of extracting a caption signal from a video signal of a television signal to be received, wherein the caption signal is selectively displayed on a screen by the viewer (S22), detecting an error of the restored data (S23), checking the data to determine whether it is Korean alphabet information (S24), and performing a determination (S24), the character data of the Korean alphabet information is read from the font ROM and stored in the Korean alphabet information storage unit (S25), and if it is the foreign language dialogue information in the decision step (24), the character data of the foreign language dialogue information is read out from the font ROM and stored in the foreign language dialogue information storage unit (S26) (S27) of checking whether the mode selected by the user is a Hangul dialogue mode, and if the Hangul dialogue mode is selected in the check step (S27), reading character data from the Hangul dialogue information storing unit (S28) (S29) of outputting the synthesized data to the screen, and if it is in the foreign language ambassador mode in the checking step (S27), reading character data from the foreign language metabolism information storage unit (S30) Synthesizing and then outputting on the screen (S29).

In the case of voice multiplexing as in movies, it is possible to broadcast bilingual subtitles with odd and even field channels. When two languages are broadcast using odd and even fields, the discrimination of the language type at the receiver can be identified by the line number of KSC5601 and displayed on the receiver. When a broadcasting operator broadcasts a subtitles in one language and subtitles in two languages, the logo can be displayed for one minute at the beginning of the program as in the case of a voice multiplex.

If the user changes the television channel when using the metabolic subtitle and the 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 the user does not receive a special control code at the time of selecting the metabolic subtitle after turning on the receiver, the receiver maintains the attribute release state and immediately writes the white character of the black background in the first column position of the tenth row of the caption area Display.

At least the receiver can be operated through the remote control or other functions corresponding to the functions defined below.

Field caption packet reception status display, caption reception sensitivity display, presence / absence of two languages, presence / absence of additional information on / off, dialog subtitle on / off function, additional information on / off function, additional information page hold function, As described above, according to the present invention, in a method and a method for transmitting a subtitle to a foreign language in a foreign language of a viewer-selectable type caption broadcasting, it is possible to provide not only the familiar English but also a variety of second It is possible to transmit foreign language dialog information and display it on a television screen.

Claims (2)

A viewer-selected subtitle broadcasting method for inserting subtitle information into an arbitrary horizontal line which does not affect a broadcasting signal for every field of a television signal and transmitting the subtitle information, the method comprising the steps of: checking whether input data is a metabase information data; Receiving a count value of a synchronization counter; Determining whether the count value of the counter is odd; If the odd number is an odd number in the determination step, inputting the Korean alphabet information; Inputting a character code of a second foreign language to be input and inputting foreign language metabolism information when recognizing that the even field is an even number in the determination step; And converting the meta information into a video signal and synthesizing it with a video signal, and transmitting the encoded video signal. The method of claim 1, wherein the flag indicating that the input data is the metabolic information is displayed as 0 in the eighth bit of the lower word and 0 in the eighth bit of the upper word in the data packet code. The method comprising the steps of: