KR100242114B1 - Apparatus and method for receiving digtal tv cldsed caption data by osd function - Google Patents

Abstract

end. TECHNICAL FIELD OF THE INVENTION

Caption broadcasting digital TV receiver

I. Technical Problems to be Solved by the Invention

It does not have a separate caption broadcasting receiver and receives the caption broadcasting using the OSD function.

All. The point of the solution of the invention

Receives the caption broadcasting data transmitted from the broadcasting station, and inserts the caption broadcasting character directly into the video signal using the OSD function to output the caption broadcasting.

la. Important Uses of the Invention

The caption broadcasting can be watched by using the OSD function without having a separate caption broadcasting receiver on the television receiver.

Description

TECHNICAL FIELD [0001] The present invention relates to a subtitle broadcast digital TV receiving apparatus and method using an OSD function,

The present invention relates to a digital TV receiving apparatus and method capable of viewing closed caption broadcasting, and more particularly, to a closed captioned digital TV receiving apparatus and method using an OSD function.

Typically, a caption broadcasting TV receiving apparatus is a TV receiving apparatus capable of detecting and decoding a caption broadcasting data by superimposing and transmitting caption broadcasting data on a 21st scanning line of a TV signal in a broadcasting station.

1 is a digital TV receiving apparatus capable of receiving conventional caption broadcasting and includes an antenna 100, a channel decoder 110, a TS decoder 120, a microprocessor 130, a video decoder 140, and an audio decoder 150, an encoder 160, and a D / A converter 170.

Referring to FIG. 1, an antenna 100 receives a TV broadcast signal transmitted from a broadcasting station and transmits the received TV broadcasting signal to a channel decoder 110. The channel decoder 110 converts the TV broadcast signal received from the antenna 100 into bitstream digital data and outputs the digital data to the TS decoder 120. The TS decoder 120 detects data for caption broadcasting in the digital data and outputs the data to the microprocessor 130. The TS decoder 120 receives the digital data and transmits the video data of the selected channel to the video decoder 140 and transmits the audio data to the audio decoder 150. The microprocessor 130 receives the data for caption broadcasting from the TS decoder 120 and transmits the caption data to the encoder 160 as a caption broadcasting decoding unit. The video decoder 140 receives the video data, decodes the video data, and outputs the decoded video data to the encoder 160. The audio decoder 150 receives the audio data, decodes the audio data, and outputs the decoded audio data to the D / A converter 170. The encoder 160 converts the digital video signal decoded by the video decoder 140 into an analog video signal and outputs the analog video signal. The encoder 160 receives the data for caption broadcasting received from the microprocessor 130, and outputs the data to the 21st line of the analog video signal. The D / A converter 170 receives the decoded audio data from the audio decoder 150, converts the decoded audio data into an analog audio signal, and outputs the analog audio signal.

In such a conventional digital TV receiving apparatus, a decoding unit for caption broadcasting must be provided so that caption broadcasting can be received. Therefore, if a decoding unit for receiving the caption broadcasting is not provided, there is a problem that the caption broadcasting can not be received.

Accordingly, it is an object of the present invention to provide a digital TV receiving apparatus and method capable of watching closed caption broadcasting.

It is another object of the present invention to provide a digital TV receiving apparatus and method capable of watching a caption broadcast without having a separate caption broadcasting function.

It is still another object of the present invention to provide a digital TV receiving apparatus and method capable of viewing closed caption broadcasting using an OSD function.

According to another aspect of the present invention, there is provided an apparatus for capturing subtitle broadcast data, the apparatus comprising: .

1 is a block diagram of a conventional digital TV receiving apparatus for caption broadcasting;

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a digital TV receiving apparatus for receiving a caption broadcast according to an exemplary embodiment of the present invention. Referring to FIG. 2, an antenna 100, a channel decoder 110, a TS decoder 120, a video decoder 140, An encoder 160, a D / A converter 170, an OSD unit 200, and a font ROM 210.

In the digital TV receiving apparatus, the video decoder 140 decodes a video signal and stores the digital video signal in digital form. The OSD function displays a program guide or character information, which is additional information of a TV broadcast signal transmitted from a broadcasting station, on a screen . That is, a subtitle broadcast is provided by using an OSD function for inserting characters or graphics required for displaying additional information of the TV broadcast signal on a digital video signal. In other words, the caption broadcasting data can be directly inserted into the digital video data in the TV broadcasting signal by utilizing the OSD function, thereby providing the caption broadcasting even in the TV receiving apparatus without the caption broadcasting function.

Referring to FIG. 2, the antenna 100 receives a TV signal including a caption broadcasting signal transmitted from a broadcasting station, and transmits the received TV signal to the channel decoder 110. The channel decoder 110 receives the TV signal including the caption broadcasting signal, converts the TV signal into digital data of a bitstream, and outputs the digital data to the TS decoder 120. The TS decoder 120 receives the bitstream and outputs the closed caption data to the OSD unit 200. Also, the TS decoder 120 separates the video bit stream from the bit stream, outputs the video bit stream to the video decoder 140, separates the audio bit stream from the bit stream, and outputs the separated audio bit stream to the audio decoder 150.

The OSD unit 200 according to the embodiment of the present invention includes a command decoder 202, a command processing unit 204, a character processing unit 206, and an OSD processing unit 208. The OSD unit 200 according to an embodiment of the present invention detects caption broadcasting data in a TV broadcast signal and transmits the caption broadcasting data to the video decoder 140 to directly insert the caption broadcasting data into the digital video data. The command decoder 202 receives the caption broadcasting data from the TS decoder 120 and separates the caption from the caption broadcasting data and transmits the separated caption broadcasting data to the command processing unit 204. The caption data separating unit 202 separates character information from the caption broadcasting data, 206). Here, the command is data indicating the position, color, background color information, and display time and method of caption broadcasting characters. The character information is data for providing character information to be displayed at the current position and shifting the cursor position to the position of the next character to be displayed. The command processing unit 204 outputs character information control data for controlling the color of the character, the display position of the character, the determination of the background color, and the display method of the character according to the command received from the command decoder 202, .

The character processing unit 206 receives the character code from the command decoder 202, reads the digital data to be replaced with the video data in the font ROM 210, and outputs the read digital data to the OSD processing unit 208. The OSD processing unit 208 receives the character information control data output from the command processing unit 204 and the character data output from the character processing unit 206 and outputs the character data to the video decoder 140. That is, the OSD processing unit 208 receives the character information control data from the command processing unit 204, receives the character data from the character processing unit 206, and outputs the determined character information to the determined position in the designated color and background color, To the digital video data output from the video decoder 140. The video decoder 140 receives the video bitstream output from the TS decoder 120 and the caption broadcasting data output from the OSD 200 and inserts the caption broadcasting data into the video bitstream . The encoder 160 converts the digital video data and the caption broadcasting data into a video signal and outputs the video signal. The audio decoder 150 receives the audio bit stream output from the TS decoder 120, decodes the audio bit stream, and outputs the decoded audio bit stream. The D / A converter 170 receives the audio data output from the audio decoder 150, converts the audio data into an audio signal, and outputs the audio signal.

As described above, according to the present invention, there is an advantage that a digital TV receiving apparatus can provide closed caption broadcasting using an OSD function without having a separate caption broadcasting receiver.

Claims (4)

A subtitle broadcast digital TV receiver using an OSD function, A channel decoder for receiving a TV broadcast signal including a caption broadcasting signal transmitted from a broadcasting station and converting the received TV broadcasting signal into bit stream data, A TS decoder for receiving the data of the bit stream outputted from the channel decoder and separating the caption broadcasting data, the video bit stream and the audio bit stream separately, An OSD unit for detecting and outputting the caption broadcasting data output from the TS decoder, A video decoder for receiving the video bit stream separated from the TS decoder and the caption broadcasting data from the OSD unit and synthesizing the caption broadcasting data in the video bitstream, And an encoder for converting the video data output from the video decoder and the closed caption data into a video signal and outputting the converted video signal. The apparatus according to claim 1, A command decoder for detecting the caption broadcasting data from the TV broadcasting signal and separating the control data and the character code from the caption broadcasting data, A command processing unit for generating and outputting a signal for controlling output of the caption broadcasting character when the caption broadcasting data is control data, A character processing unit for converting the data corresponding to the character code into video data and outputting the video data if the caption broadcasting data is a character code, And an OSD processing unit for receiving video data output from the character processing unit according to a control signal output from the command processing unit and outputting the video data to the video decoder. A subtitle broadcast digital TV receiver using an OSD function, A TS decoder for receiving the TV broadcasting signal transmitted from the broadcasting station and determining the type of data for the TV broadcasting signal and separating the TV broadcasting data into the subtitle broadcasting data, the video data and the audio data; A command decoder for receiving the caption broadcasting data separated from the TV broadcasting data from the TS decoder and separating the command and character information from the caption broadcasting data, A command processor for receiving a command from the data separated from the command decoder and outputting a control signal for controlling a character to be output, A character processor for receiving character information from data separated from the command decoder, converting the character information into video data, And an OSD processing unit receiving the control signal output from the command processing unit and processing the character data output from the character processing unit according to the control signal. A method of receiving a subtitle broadcast digital TV using an OSD function, Receiving a TV broadcast signal transmitted from a broadcasting station and detecting caption broadcasting data; Determining a type of the detected closed caption data; Performing an operation for controlling a character when the type of the detected closed caption data is an instruction; Converting the character information into video data when the type of the detected closed caption broadcasting data is character information; And inserting the controlled caption broadcasting character into the digital video signal through the above process.