KR100188271B1 - Tele-viewer option additional information display apparatus & method thereof - Google Patents

Abstract

The present invention provides a system controller for outputting data for overall control of the operation of a peripheral device according to data input to a command input unit, and a television signal of a channel selected from a high frequency signal received at an antenna by control data output from the system controller. An analog / digital converter for demodulating a digital signal and outputting a voice signal and a video signal and connecting the output of the audio signal and the tuner unit to be supplied to the video signal processor to convert the output caption signal into a digital signal and output the digital signal; A caption processing unit which reads data stored in the font room by using the data decoded by the conversion unit as an address and processes the caption signal, and alternately writes subtitle data corresponding to one page of the caption data output from the caption processing unit; To read and convert it into a video signal And a first and second display RAMs for supplying the caption processing unit and a mixer for supplying the caption video signal output from the caption processing unit and the video video signal output from the caption processing unit to the display driver. By displaying additional information on the screen, viewers can visually know weather forecasts, etc. when necessary, and a viewer-selective additional information display device and method for manufacturing a system at low cost by utilizing a display RAM used in caption mode. will be.

Description

Viewer-selective additional information display device and method

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

2 is a view showing a viewer-selective additional information display device according to the invention of the ball;

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 and 6 are diagrams for explaining screen display states in an additional information mode.

7 is a flowchart for explaining the operation of the viewer-selective additional information display device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viewer-selective additional information display device and a method thereof. In particular, when a character and a control code are transmitted on a television signal, the receiving device receives the received information and displays the additional information on the screen. It is about a method.

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 Korean in a closed caption method, a Korean character is divided into each phoneme of a consonant, a neutral, and a consonant, and an ASCII code corresponding to each phoneme is transmitted. Korean characters are displayed by mapping, neutral and final.

Since the conventional Korean closed caption method uses at least 2 to 3 bytes to represent a Korean character, the transmission speed and display speed are slow, and the decoding process is required to find the position of one character by combining 3 to 4 bytes in the decoding process. 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 receiving device has a poor reception state and thus the quality of the caption display is pointed out. have.

Accordingly, the present invention provides a viewer-selective additional information display apparatus and method for displaying additional information transmitted by a viewer-selective caption broadcasting method, which is provided so as to effectively provide closed caption broadcasting in Korean. The purpose is to provide.

The viewer-selective caption broadcasting method is a viewer-selective caption broadcasting method in which subtitle information is inserted and transmitted in an arbitrary horizontal line that does not affect the broadcast signal in every field of the television signal, and the caption information is a plurality of predetermined commercial characters. Character code consisting of two bytes for specifying them or a control code consisting of two bytes for independently performing a subtitle control function.

In addition, the broadcasting method is a viewer-selective caption broadcasting method in which subtitle information is inserted and transmitted on an arbitrary horizontal line that does not affect the broadcasting signal for every field of the television signal, and the character information or additional characters of the dialogue captions together with the control information. Inputting information: generating control information as a control code of 2 bytes by combining mode control bits and parity bits, and generating character information as a character code of Korean complete code by combining mode control bits and parity bits. : Inputting the control code or character code and outputting the digitally decoded caption signal; and loading the caption signal on a predetermined scan line of every field of the video signal.

On the other hand, the viewer-selective additional information display device according to the present invention, a system controller for outputting data for overall control of the operation of the peripheral device according to the data input to the command input unit, and the antenna by the control data output from the system controller Demodulating the television signal of the selected channel among the high frequency signals received at the output signal and outputting the audio signal and the video signal, and converting the caption signal sent out to a digital signal by being connected to the output terminal of the tuner unit supplied to the audio signal processing unit and the video signal processing unit. An analog / digital converting unit, a caption processing unit for reading data stored in a font room by using the data decoded by the analog / digital converting unit as an address, and processing the data as a caption signal, and the caption data output from the caption processing unit are different from each other. Subtitle data for the page The first and second dissipation RAMs, which are alternately written and read out and converted into video signals, are supplied to the display driver, and the display driver supplies the caption video signals output from the caption processing unit and the video video signals output from the video signal processing unit. It is characterized by having a mixer configured to display additional information.

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 caption and additional information subtitle broadcasting function. The audio signal input through the microphone 10 is transmitted from the voice signal processor 30 to the television signal modulator 50 for mixing and amplifying. 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 modulates the transmitted audio signal by FM, modulates the video signal by AM-modulation 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.

In the subtitle encoding unit 70, the text information input unit 71 receives additional information such as dialogue information or urgent news or delivery information related to the television screen. Various control information for subtitle control is input through the control signal input unit 72. The character government input unit 71 includes a keyboard for inputting characters such as Korean, English, Chinese characters, Japanese, and special characters, and outputs the inputted character information as a two-byte Hangul completion code KSC5901. The control unit 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.

In the character code generator 73, the MSB of each byte of the input two-byte character code is used as the subtitle / additional information flag.In the case of additional information, the MSB is replaced with '0' and a parity bit is added 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 sync 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, a configuration of a television receiver for receiving viewer-selective broadcast broadcasting is shown.

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 processing unit 120, and the moving picture is amplified and amplified and output as voice through the spurs 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. Decode the extracted data packet to control the subtitle processing in response to the decoded control code, and read the character data from the font ROM 240 in response to the decoded character code to the first and second display RAMs 245 and 250. Write and read alternately. Character data stored in the first and second display RAMs are converted into RGB signals 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 180 and controls the system in response to control data transmitted from the caption processing unit 180.

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

Korea uses M-NTSC TV signal of 525 lines and 60 fields / sec 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. References include Ic-R Rec 473-2 and FCC Report and Order 83-120 in the United States.

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 ± 125 bps, and the maximum long-term change rate should be within ± 196 (0.0125 bps). 10Hz), 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 sub-wave is discontinuous due to screen editing, etc., at least phase synchronization should be made to 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. One cycle of sine wave with frequency fsc / 8 (447.443 kHZ) uses a digital modulation scheme called Binary Phasc Shift Keying (BPSK) or Phase Rcvcrsal Keying (PRK). 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 waveform may experience severe distortion where logic transitions occur, so that the phase-corrected waveform can be used for broadcasting after passing through 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, and the waveform of gap 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 sinusoidal signal of 6 cycles and can be used by the caption decoding unit to extract the signal and read out the 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 midpoint (0H) of the horizontal synchronization signal, and the phase of the color carrier of the scan line is 180 degrees. In the case of degrees, it starts at the point of 9.64usec (34.5 cycles of color burst) from the falling edge of the horizontal synchronization signal (0H). 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 a period of a sinusoidal signal of fsc / 16 (223.722 kHz) and 180 degrees in phase, and 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: a parity (p) in Weed, a subtitle / additional information flag (C / T), and a code value. D0 to D8 are the lower words, and D9 to D17 are the upper right 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 zeros; otherwise, they are interpreted as character codes.

5 and 6 show examples of screen display of additional information. 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 == ㅖ-Row 4-Row 4-Row 4-Row 4-Seoul S Sunny SS0 Degree-APDR-APDR-6APF-6APF-{Daejeon S Cloudy SS2 Degree}-APDR-APDR-Column 4 -Column 4-{Gwangju S Cloud SS4 Degree}-APDR-APDR-6APF-6APF-{Busan S Ratio SSS3 Degree}-APDR-APDR-Column 4-Column 4-Daegu S Ratio SSS3 Degree-APDR-APDR -4th column-4th column-{Chuncheon S-Eye SS-4 degree}-End of page-End of page.

Tomorrow's match codes are sent from the start of the page-start of the page-row 2-row 2-row 4-row 4-APF-APF-tomorrow's tour guide-row 4-row 4-row 2 Row-Row 2-{Soccer-2: 00 PM (Suwon Football Field)}-APDR-APDR-{Basketball-4: 00 PM (Indoor Gymnasium)}-APDR-APDR-Row 2-Row 2-{Volleyball-AM 10 o'clock (Student Gym)}-APDR-APDR-{Table Tennis-11:00 AM (Seoul University Gymnasium)}-APDR-APDR-{Baseball-5 AM (Jamsil Baseball Stadium)}-APDR-APDR-Row 3-3 Column-{the above can be canceled due to weather relations}-APDR-APDR-Column 2-Column 2-{Yes}.

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

Bilingual Subtitle Caption Selection

Vertical write protection

An operation process of the viewer-selective additional information display device operated as described above will be described in detail with reference to the flowchart shown in FIG. 7.

When the data corresponding to the caption mode is input to the command input unit 190 shown in FIG. 2, the system controller 180 scans the input data and switches the operation mode of the system to the caption mode as shown in step S1 of FIG. In step S2, it is determined whether the caption broadcast is the dialogue subtitle or additional information.

As a result of the determination in step S2, if the subtitle is a subtitle, the process proceeds to step S5, and if it is additional information, the process proceeds to step S3 to determine whether the viewer inputs additional information stop data.

If the additional information stop data is not input in step S3, the additional information corresponding to one page is alternately written and read out in the first and second display RAMs 245 and 250 as in step S4, and the received additional information is continued. If additional information stop data is input in step S3, the current additional information is continuously displayed as in step S6 (picture stop state).

In step S6, it is determined in step S7 whether the release data is input in the state of displaying the current additional information. If the release data is input, the flow proceeds to step S4 to continue displaying the received additional information.

According to the present invention described above, the additional information is displayed on the screen, so that the viewer can visually know the weather forecast when necessary, and can utilize the display RAM used in the caption mode to manufacture the system at low cost.

Claims (3)

Demodulates a television signal of a channel selected from a system controller that outputs data for overall control of the operation of the peripheral device according to the data input to the command input unit, and a high frequency signal received from the antenna by the control data output from the system controller; An analog / digital converter for outputting a voice signal and a video signal, connected to an output terminal of a tuner unit for supplying a voice signal processor and a video signal processor, and converting and outputting a caption signal to a digital signal; and in the analog / digital converter The caption processing unit reads the data stored in the font ROM using the decoded data as an address and processes the caption signal, and the caption data output from the caption processing unit alternately writes and reads subtitle data corresponding to one page. Subtitle to convert to signal And first and second display RAMs for supplying to the display unit, and a mixer for supplying the caption video signal output from the caption processing unit and the video video signal output from the video signal processing unit to the display driver. And a viewer selectable additional information display device. In the caption mode, whether the received caption information is the subtitle caption or the additional information is determined by the first judgment step that performs caption processing when the caption is the subtitle, and if the additional information indicates that the additional information stop data is inputted as the result of the first decision step? And a display step of continuously displaying additional information received when the stop data is not input as a result of the determination in the second determination step. The method of claim 2, further comprising: continuously displaying the current additional information in a stationary state when the stop data is input as a result of the determination in the second determination step.