KR100202221B1 - Caption information additional methode of tv brodcasting - Google Patents

Abstract

The present invention relates to a method of inserting and transmitting character information of a screen and a control signal thereof using a vertical blanking period in a TV signal, wherein the character information and the control signal thereof are composed of 2 bytes, The character code is characterized in that two bytes are coded to designate one character.

In addition, the frequency of the color carrier is approximately a multiple of the frequency of the data bit clock, using 70 IRE amplitude and BPSK modulation method to improve the transmission efficiency, display characters based on KSC5601, and simplify the code of the control code Reduce the length and use more parity bits.

The dialogue information can be displayed at any time regardless of the control code, and the text mode and dialogue information are distinguished by letters.

Characterized discriminating information has parity for all 2 bytes.

In addition, the control code indicating the metabolic information display mode is eliminated and the display state control code is used.

Description

TV Broadcasting Program Ambassador Information Additional Broadcasting Method

1 is a diagram showing metabolic information signal format on a scanning line;

2 is a table showing an example of types and values of control codes.

3 is a diagram illustrating a display area and a display size of one letter.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adding a dialogue to a TV program and broadcasting it, and a method of inserting a dialogue into a video tape or the like.

[Prior art]

The metabolic information supplementary broadcasting refers to a broadcast in which the dialogue contents can be viewed by the viewer's choice, unlike subtitles indicating emergency news or notifications on a normal TV screen.

Normally, closed captioning is not something that a viewer can select and see, which is determined not only by the broadcaster's choice, but only by the broadcaster's choice, which is commonly referred to as open caption.

On the contrary, the present invention relates to a broadcaster always carrying metabolic information in ordinary TV broadcast information, and allowing the broadcaster to view the metabolic information at the viewer's choice. This is commonly referred to as closed caption.

On the other hand, in the videotape recording method, a character such as a subtitle of a TV can be inserted, and the so-called closed caption videotape can be produced by adding the metabolic information of the present invention in the same manner as the metabolic adding method in broadcasting.

These dialogue-added TV broadcasts and video tapes are very urgent for farmers who can see the screen but cannot hear the voice and are very useful for foreign language learning.

In particular, the necessity was emphasized for the welfare of farmers, etc., and research on it was done early.

Since hearing impaired people cannot understand TV contents without sign language, the United States has been broadcasting texts in English for the deaf in Korea since 1978.

On the other hand, the method and device for Hangul metabolic information has also been studied and the results have been published.

The most recent of these proposals, US Pat. No. 5,294,982, published in March 1994, describes a method and apparatus for dual Chinese broadcasting of TV programs.

In particular, this patent specifically discloses the method of broadcasting Korean ambassadors.

That is, the present invention relates to a closed captioning system of at least two languages.

The two languages refer to the Roman language, the syllable alphabet language, and the syllable alphabet language. The syllables include Japanese and Chinese. It is explained as a representative.

The present invention has its characteristics in the processing of syllable characters, which will be explained using Korean as an example.

First, in order to display 300 characters (syllables) that are used well, 327 character elements (ie, initial, neutral, and final) are stored and encoded and decoded accordingly.

Therefore, 3 to 4 bytes (1 byte of head code and 2 to 3 tail code) are required to display the Korean pole of one syllable, and the decoder receives this data and combines specific characters. Maps each phoneme to a pointer.

For example, in the case of the letter Han, a pointer is designated to display each of *, *, * stored in a ROM (Read Only Memory).

Of course, English can also be displayed.

[Problem to Solve Invention]

However, such conventional metabolic information supplementary broadcasting is unsuitable for Korean expression, and the signal format itself can be applied because the environment (70% of new music) of the US (building group on flat land) and Korea are different in receiving broadcast radio waves. Therefore, the present invention has been made in order to facilitate convenience in watching TV of Korean deaf people.

The above conventional technology specifically has the following drawbacks.

That is, a PLL (Phase Locked Loop) other than the conventional TV reception is required for synchronizing data clocks for extracting information.

In addition, since 3 to 4 bytes are used to display one character, transmission and display speeds are slow, and decoding process is complicated because it is necessary to find a position of one pole by combining 3 to 4 bytes.

In addition, since there is no parity information for viewing the entire 2 bytes in one field as a unit, there is a problem in accurately checking the reliability of data.

Also, simultaneous expression of Chinese characters, Japanese, and Korean was not possible.

Also, it was impossible to express special symbols.

In addition, the S / N ratio is low because a non-return to zero (NRZ) of 50 Institute of Radio Engineers (IRE) scale amplitude is transmitted as a channel signal.

In addition, independence between the text mode and the dialogue information mode is required because the control code is required when transferring to the text mode (text display mode in closed captions) and then returning to the text mode after inserting dialogue information in the middle. There was no.

In addition, in the prior art, the control code for the display mode must be present.

Therefore, if the control system for distinguishing the display mode of metabolic information is complicated in overall transmission efficiency and if it does not receive the display mode control code at the time when the receiver starts to operate, it displays the received metabolic information until the next control code is received. There was a drawback to not be able to mark on.

Accordingly, the present invention seeks to solve the above drawbacks and provide an efficient encoding / decoding and transmission method for adding metabolic information.

[Configuration to solve the problem]

In order to solve the above-mentioned drawbacks, the present invention provides a divisor of the color carrier frequency (3.58 MHz) to simply use a PLL that is basically present in an existing National Television System Committee (NTSC) receiver or a Video Cassette Recorder (VCR). ) Use the frequency (Fsc / 8) as the data bit clock.

Also, KSC5601, which is 2 bytes, is used as the Korean code, and the SNR is increased by transmitting a BPSK (Binary Phase Shift Keying) signal having a 70 IRE amplitude as a channel signal.

Characters are also displayed based on KSC5601.

On the other hand, by simplifying the kind of control code, it reduces the code length and uses more parity bits.

The dialogue information can be displayed at any time regardless of the control code, and the text mode and dialogue information are distinguished by letters.

In addition, the information with the distinctiveness in units of letters has a parity function for the entire two bytes.

In addition, the control code indicating the metabolic information display mode is eliminated and the display state control code is used.

EXAMPLE

The present invention relates to a method of characterizing the dialogue of a performer in a television broadcast and superimposing the information on an existing television signal. More specifically, the target horizontal scanning line when the dialogue information is superimposed on the television signal by replacing the dialogue information with the KSC5601 Korean-pole complete standard. The position of the field, the KSC5601 code value, and the control code value are displayed in the horizontal scan line, and the function of the control code is defined. Hereinafter, an embodiment of the present invention will be described based on the drawings and the like.

In the description of the present invention, text refers to closed caption information on the premise of displaying information irrelevant to the contents of fire prevention on a full screen. It refers to closed caption information on the premise of displaying it in the form. It is defined and used as a character or character information that includes both.

Several methods have been proposed to superimpose new information on a television signal, such as vertical multiplexing of baseband television signals such as text multiplexing, KBPS Korean VCR reservation recording, and GCR (Ghost Cancellation Reference) broadcasting. There is a method of inserting digital information using a vertical blanking interval and a method of splitting a transmission frequency band such as voice multiple broadcasting.

Among these methods, the method of inserting digital information is also divided into various types such as digital modulation such as Non Return to Zero Keying (NRZK) and Phase Shift Keying (PSK) or modulation of Pseudo-random Noise (PN) code waveforms. Receiving characteristics and the like vary depending on each method.

Most of the additional broadcasting inserting digital information utilizes the vertical blanking period of the television signal.

However, in the scheme proposed by the present invention, since the reference clock for detecting data bits is associated with the color sub-carrier of the NTSC signal, the last line of the video signal valid section is used.

In addition, the data modulation method uses BPSK.

The format of the signal is shown in FIG.

According to the format of the signal shown in FIG. 1, the NRZ signal of the first two bit sections has a function of start bit, and two words consisting of nine bits are transmitted one by one, and eight bits are information. And a bit for parity for them and one bit for the eight bits.

In other words, the preceding DP (parity bit) is D0 Parity bit up to D7, DP afterward is D0 Parity fit for D7.

Leading D0 D7 is the Least Significant Byte (LSByte), D0 at the end D7 is Most Significant Byte (MSByte).

This MSByte and LSByte are combined to create the KSC5601 complete code and the necessary control code to represent text or dialogue information for broadcasting.

The control code is shown in FIG.

The distinction between the control code and the complete character code is determined by whether D6 and D5 of LSByte and D6 and D5 of MSByte are also 0.

That is, if all of the bits are 0, it is a control code, otherwise it is a character code.

The conventions for screen display are as shown in FIG.

When configuring the receiver, you can use the font ROM already in use on your computer. Accommodates 16 sizes.

As a result, only an area corresponding to 80% of the effective display portion of the CRT screen is used as the character display area, and may be displayed in 24 characters in length and 10 in length.

Within one field of the NTSC signal, the vertical occupies 200 scan lines from scan line 41 to scan line 240, horizontally 14.66 from the HSync falling edge. starting from sec, 42.08 Occupied during sec.

In LSByte

D7 is 1 in text transfer mode, 0 in dialogue transfer mode, (D ₄ , D ₂ , D ₁ ) has a valid value for the control code.

D ₃ = D ₄ , i is the parity bit of D ₂ , ) D ₀ = D ₂ , i D ₁ is also a parity bit.

D6 and D5 are always 0 for control codes.

On the other hand, in MSByte D ₇ is 1 in text transfer mode, 0 in dialogue transfer mode, (D ₄ , D ₃ , D ₂ , D ₁ ) has a valid value for this control code.

D ₀ = D ₁ , i D ₂ , i D ₃ , i D ₄ parity bit, D ₅ and D ₆ are always 0 for control codes.

On the other hand, D7 of LSByte and D7 of MSByte have a function of group parity that must always match.

Therefore, if the value of D7 of LSByte and the value of D7 of MSByte do not match, the receiving side considers this as a transmission error and does not process any further data.

The display mode of the closed caption Hangul information in the receiver is set to the dialogue information (subtitle) mode and the non-speech information (TEXT) mode, that is, the text mode.

Non-parabolic information is shown in the entire character display area shown in FIG. 5 consecutive lines are displayed.

Metabolic information mode is divided into three types: pop-on, roll-up, and roll-down.

The pop-on mode is a format in which dialogue is suddenly displayed on the screen. The pop-on mode is mainly used when simultaneously processing dialogues of several people, and a desired line is selected at the same time instead of successively in the character display area.

Roll-up mode and roll-down mode means that each time the roll-up and roll-down control codes are received in the display control group of FIG. 2, the display is rolled up or down based on the current line.

Like the existing NCl method, it is displayed on the screen, but the method of using the control code is different.

In other words, the specific mode is not specified in the control code, and display control is performed at every moment as necessary.

In the past, (pop-on mode control code) + string code + (display control code), a few seconds elapsed, (screen erase code) were used, but in the method proposed by the present invention, (screen erase control code) + string code + Since the (display control code) is transmitted continuously, there is no need to use the pop-on mode control code.

In roll mode, instead of the roll-up mode consisting of (roll-up mode control code) + (area designation) + character code string + (line break), two-line rollup and three-line rollup incorporating region designation and line break functions are included. By using individual control codes, (rollup mode control code) and (area designation code) are unnecessary.

As a result, the S / W implementation of the receiver is simple, but the corresponding complexity increases on the transmitting side, reducing the cost of the majority of the receivers and increasing the additional cost of the transmitter, that is, the broadcast operator.

In addition, one or more control codes must be transmitted for every 48 words (24 characters) transmission, and the vertical position control codes must be transmitted once every 5 lines. There is no problem with turning on the receiver at any time.

In addition, the character information received between turning on the receiver and receiving the display control signal is displayed in the receiver according to a predetermined mode by default.

After that, when the display control code is received, the display according to the control code is performed.

[Effects of the Invention]

In the present invention, since the frequency bit (Fsc / 8) of the color carrier frequency (3.58 MHz) is used as the data bit clock, the encoder and decoder are simply used because the PLL basically built in the existing NTSC receiver or VCR is used. Becomes simpler.

In addition, KSC5601, which is 2 bytes as the pole code, is used to improve the transmission efficiency compared to the conventional method of expressing characters using 3 to 4 bytes. Simultaneous expressions of Chinese, Ghanaian, English, Russian, Greek, and special symbols are possible.

In addition, BPSK (Binary Phase Shift Keying) signal with 70 IRE amplitude is transmitted as channel signal, so SNR is increased by more than 14%, widening the service area and lowering bit error rate by more than 1/10.

It also simplifies the type of control code to reduce the code length and use more parity bits to increase the transmission efficiency, check the transmission error accurately, and use roll-up, pop-on only with the display control function. on) can be displayed.

In addition, the metabolic information can be displayed at any time by the control code and the correlation business, and the information transmission share is high because the text mode and the metabolic information are configured to be distinguishable in letter units.

In addition, since the information with the distinction of the letter unit has a parity function for the entire 2 bytes, efficient error checking is possible.

Claims (1)

In the character information addition method of a TV broadcast that carries information necessary for a TV signal and displays on a TV screen a dialogue or a text that is not related to the screen, the character information includes a character code and the character. It consists of a control code indicating color, position, property, size, etc. to be displayed on the screen, wherein the character code is coded so that two bytes designate one character, and the control code is two bytes one And displaying a function and inserting a signal for the character information into a vertical blanking interval of a TV signal.