KR20000066694A - Method for controlling decoding multiple caption broadcasting signal - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling caption broadcasting of a television, and more particularly, to a method for controlling decoding of a multi caption broadcasting for receiving a character caption broadcasting of two or more languages and displaying a desired character caption according to a user's selection. .

According to the present invention, two or more types of caption data having different specifications are decoded together by a multi-routine, whereby a caption broadcasting signal desired by a user can be freely displayed.

Description

Decoding control method of multiple caption broadcasting {Method for controlling decoding multiple caption broadcasting signal}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling caption broadcasting of a television, and more particularly, to a method for controlling decoding of a multi caption broadcasting for receiving a character caption broadcasting of two or more languages and displaying a desired character caption according to a user's selection. .

In general, closed caption broadcasting transmits a character code corresponding to an audio signal at a specific position of a video signal by a broadcasting station for a hearing impaired person or language education. In addition, the receiving side separates and extracts the corresponding character code through a television receiver with a built-in text broadcasting decoder, decodes it, synthesizes it with the signal processed video signal, and superimposes it on the video signal to display the text signal.

However, such caption broadcasting has different standards for each country. For example, the English subtitle broadcasting signal of the United States carries a character caption signal on the 21st line of every frame of the video signal, and the Korean Korean subtitle broadcasting signal carries the character caption signal on the 284th line of every frame of the video signal. Then send. In addition, since the character fonts are different from each other, a decoder and a font memory according to the same must be separately installed.

However, according to the related art, as illustrated in FIG. 3, when two or more types of caption broadcasts are received, caption broadcasts other than the designed type are designed to process only caption data by a single text broadcast. When received, the text caption signal could not be processed. In addition, a decoder for Korean subtitle broadcasting has not been developed yet. Moreover, when receiving Korean subtitle broadcasting and English subtitle broadcasting at the same time, it is inconvenient to use because the user cannot select the desired subtitle broadcasting.

The technical problem to be solved by the present invention is to decode the multi-caption broadcasting for decoding and displaying the multi-character caption broadcasting in accordance with the user's selection when performing two or more character caption broadcasting of different standards in order to solve the above problems To provide a control method.

1 is a block diagram of a caption television to which the present invention is applied.

2 shows a specification of a caption signal carried in a video signal.

3 is a flowchart of a decoding control method for text caption broadcasting according to the related art.

4 is a flowchart of a decoding control method for multiple caption broadcasting according to the present invention.

FIG. 5 is a detailed configuration diagram of the caption data processing block shown in FIG. 1.

In order to achieve the above technical problem, the decoding control method for multi-subtitle broadcasting according to the present invention is a subtitle control method for receiving and processing two or more types of character subtitle broadcasts having different standards, and receiving two or more types of subtitle broadcasts having different standards. A caption control method for processing a caption data, the method comprising: (a) extracting caption data of all caption broadcasting standards included in a video signal, and (b) caption data extracted in the step (a) (C) performing caption decoding of the closed caption broadcasting according to the result determined in step (b), and (d) image of the text signal decoded in step (c). And synthesizing and displaying the signal processed signal.

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

In the exemplary embodiment of the present invention, for convenience of description, the description will be made only with the case of simultaneously performing English caption broadcasting in the United States and Korean caption broadcasting in Korea.

As shown in FIG. 2, the caption data by the character closed caption broadcasting generally starts with a start signal indicating a start sync bit, a clock sync signal (c) for clock synchronization followed by a horizontal sync signal (a) and a color burst signal (b). Bit d, and first and second codes e and f each composed of eight bits. There are two types of first and second codes, control codes and character codes.

1 is a block diagram of a television to which the present invention is applied, which is briefly described as follows.

Receives broadcast signals transmitted from a broadcasting station through the antenna 101, and tunes only the broadcast signal of a channel selected by the user among the broadcast signals of each received channel in the tuner 102, and outputs the video signal separately from the audio signal. .

Then, the video signal processor 103 separates the video signal into a luminance signal and a color signal, demodulates the output signal, and outputs a composite video signal including the processed signal to the data slicer 104.

The data slicer 104 extracts all caption data according to each character caption broadcasting standard and outputs the caption data to the character signal processing unit 105. The text signal processing unit 105 performs decoding suitable for the caption code of the character broadcasting. Output to the synthesis section 106.

The synthesizing unit 106 mixes the video signal processed by the video signal processing unit 103 and the text signal processed by the text signal processing unit 105, and then displays it on the screen through the display unit 107.

FIG. 5 shows a detailed circuit configuration of the caption data processing block including the data slicer 104 and the character signal processing unit 105 above.

As shown in FIG. 5, the caption data processing block includes a caption data extraction unit 501, a control unit 502, a font ROM 503, a switching unit 504, a first display memory 505, and a second display memory. 506, multiplexer 507, and buffer 508.

If caption data is included in the composite video signal, the caption data extracting unit 501 separates the caption data from the video signal. At this time, the caption data of the English caption broadcasting in the United States is contained in the 21st horizontal synchronizing signal, and the caption data of the Korean Korean caption broadcasting is contained in the 284th horizontal synchronizing signal, so that the horizontal synchronizing signal of each field is counted by the counter. Caption data contained in the second and second 84th horizontal synchronization signals is extracted.

The controller 502 receives the extracted caption data, determines whether the input caption data is a Korean caption code or an English caption code, and determines whether the input caption data is a control code or a character code. To control.

The font ROM 503 is a memory for storing English fonts and Korean font information.

The switching unit 504 switches to alternately store the character information read from the font ROM 503 in the first and second display memories 505 and 506 in order to display them in units of fields.

The first and second display memories 505 and 506 store character information displayed on a field-by-field basis, while the other memory outputs the displayed character information while the display memory stores the character information.

The multiplexer 507 selects and outputs only one character information from character information input from the first and second display memories 505 and 506.

The buffer 508 serves to output the character information by matching the input character information with a signaled video signal.

The text information output as described above is synthesized with the video signal signal-processed by the synthesis unit 106 shown in FIG. 1 to display the closed caption broadcasting on the screen.

Next, the present invention will be described step by step with reference to the configuration of FIG. 5 with reference to the flowchart of FIG. 4.

In step 401, caption data contained in the input composite video signal is extracted. That is, the caption data extracting unit 501 displays the caption on the corresponding horizontal sync line (the 284th line for the Korean Korean closed caption broadcasting and the 21st line for the English subtitle broadcasting of the United States) in which the caption data is included in every field. Extracting data. Therefore, in one embodiment of the present invention, caption data contained in the 21st line and the 284th line of the horizontal synchronization signal is extracted.

In step 402, it is determined whether the caption data extracted by the control unit 502 is caption data by Korean Korean subtitle broadcasting or caption data by English subtitle broadcasting in the United States. This is determined by comparing the code system of the caption data by the domestic broadcast and the caption data by the US broadcast.

In step 403, the determination result of step 402 determines whether the input data is a control code or a character code in the case of caption data by US broadcasting.

In step 404, in the case where the result of the determination in step 403 is a control code, it is determined whether the control code is a valid control code. That is, it is determined whether it is included in the English control code table set in the control code table at the time of caption decoding. If the control code is not a valid control code, the control code is affected by noise or the like and an error occurs in the decoding process. Therefore, the process returns to step 401 and the next caption data is repeatedly processed in the above manner.

In step 405, the determination result of step 402 determines whether the input data is a control code or a character code in the case of caption data by domestic broadcasting.

In step 406, in the case where the result of the determination in step 405 is a control code, it is determined whether the control code is a valid control code. That is, it is determined whether it is included in the Hangul control code table set in the control code table at the time of caption decoding. If the control code is not a valid control code, the control code is affected by noise or the like and an error occurs in the decoding process. Therefore, the process returns to step 401 and the next caption data is repeatedly processed in the above manner.

In step 407, when two or more types of caption data are input according to the caption broadcasting priority determined by the user, one caption data is selected and processed as follows. If the Korean caption data by the domestic broadcast and the English caption data by the US broadcast are input at the same time, if the priority is given to the Korean subtitle broadcast, the caption data input in steps 405 and 406 is selected and processed. In the case where the caption data input in step 403 and step 404 are selected and processed, when the single caption data is input, only the corresponding caption data is processed and output.

If it is determined in step 403 and step 405 that the character data is determined, the control unit 502 reads the character data from the font ROM in which the font of the caption broadcast is stored, and then performs unit-by-field operation by the configuration described with reference to FIG. 5. To output a text signal.

Next, when it is determined in step 404 and step 406 that the effective control code, the control unit 502 determines the character display control method such as text color, character position, continuous or instantaneous display according to the control code, and accordingly the character Control the output of the signal.

When two or more types of caption broadcasts having different specifications are received by the above operation, the corresponding caption broadcasts can be displayed on the screen by the user's selection.

As described above, according to the present invention, two or more kinds of caption data having different specifications are decoded together by a multi-routine, whereby a caption broadcasting signal desired by a user can be displayed freely.

Claims (2)

In the subtitle control method for receiving and processing two or more types of subtitle broadcasts having different standards, (a) extracting caption data of all subtitle broadcasting standards contained in the video signal; (b) determining which caption broadcasting caption code corresponds to the caption data extracted in step (a); (c) performing caption decoding of the caption broadcasting according to the result determined in step (b); And and (d) synthesizing and displaying the text signal decoded in step (c) with the video signal processed signal. The method of claim 1, wherein when two or more types of caption broadcasting caption codes are detected in step (c), the caption codes of the caption broadcasting are selected and decoded according to the priority determined by the user. Decoding Control Method.