KR100294677B1 - Apparatus and method for processing caption of digital tv receiver - Google Patents

Abstract

The present invention relates to a caption information processing apparatus and method of a digital TV receiver capable of processing caption information regardless of analog / digital and displaying the same on a screen. Caption decoder to configure, a caption converter for converting the analog caption decoded by the caption decoder to the digital caption feedback to the caption decoder, the analog caption output from the caption decoder according to the user's analog caption mode selection digital caption through the code converter It is configured to include a control unit to be converted into a multi-caption display mode irrespective of analog / digital captions to provide a differentiation effect from other products according to the performance improvement.

Description

Caption information processing apparatus and method of digital TV receiver {APPARATUS AND METHOD FOR PROCESSING CAPTION OF DIGITAL TV RECEIVER}

The present invention relates to a digital TV receiver, and more particularly, to an apparatus and method for processing caption information of a digital TV receiver.

Currently, TV's role as a provider of news, information and entertainment in daily life is increasing, but the hearing impaired are unable to use most TV programs properly.

Therefore, the caption function was developed to solve this problem, and the digital TV receiver with the caption function demultiplexes and decodes the caption information included in the additional information of the transport stream transmitted from the broadcasting station according to the user's selection. It is a device that outputs video of OSD type and sound synchronized with it through a series of signal processing.

In this case, the transport stream is composed of 188 byte packets, and each packet is identified by a packet ID (PID).

In the United States, all TVs 13 inches or larger that are produced or imported in the United States after July 1, 1993 must be equipped with a closed caption decoder that generates screen composition information for extracting, analyzing, and displaying caption information. To enact a law.

The caption international standard is EIA-608 as the caption standard established in NTSC, the analog TV standard, and EIA-708 as the caption standard established in the ATSC, the digital TV standard.

At this time, EIA-708, which is a digital TV standard, has 16 captions, that is, 16 languages, which is about twice that of analog, and the amount of caption data transmitted per second is about 10 times or more. In addition, since caption-related information transmitted on the current channel is included in the additional information and transmitted, it is possible to know which languages are currently served as captions.

In the early days of digital broadcasting, digital captions are not provided, and analog captions are simply converted to digital and sent to the digital caption transmission part.

Hereinafter, a caption information processing apparatus and method of a digital TV receiver according to the related art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating a caption information processing apparatus of a digital TV receiver according to the prior art, and FIG. 2 is a flowchart illustrating a caption information processing method of the digital TV receiver according to the prior art.

As shown in FIG. 1, the caption information processing apparatus of the digital TV receiver according to the related art tunes a digital broadcast signal received through an antenna and converts it into a temporally multiplexed transport stream through VSB demodulation and error correction. A demultiplexer 12 and a demultiplexer 12 outputting the compressed video / audio information and additional information by demultiplexing the transport stream output from the tuner / demodulator 11 and the tuner / demodulator 11 Image separation unit 13 for extracting caption information included in the user information of the video / audio information, the amplifier A / V decoder 14 for extending and restoring the video / audio information output from the image separation unit 13, video Caption decoder 15 for decoding the caption information output from the separating unit 13 and extracting the caption information selected by the user, and configuring the OSD, the function or use provided by the digital TV receiver Image signal and caption decoder 15 output from the Graphic User Interface (GUI) processor 17 and the amplifier A / V decoder 14 for generating user interface screen configuration information for displaying the operation command processing result of the user on the screen. Mixer 18 to mix the OSD signal output from the output and the GUI processor 17, and converts to NTSC signal form including the analog caption information output from the caption decoder 15 in the output of the mixer 18 NTSC encoder 16, the control unit 19 for capturing the caption type according to the caption information output from the image separation unit 13 and controlling the caption decoder 15 so that the caption information selected by the user is output. do.

Referring to the caption information processing method of the prior art configured as described above is as follows.

First, the controller 19 sets the voice / video PID (Packet ID) of the channel selected by the user to the demultiplexer 12, and accordingly, the demultiplexer 12 demultiplexes the corresponding audio / video signal and additional information, thereby separating the image. Transfer to (13).

Subsequently, the audio / video signal separated by the image separator 13 is decompressed and restored by the amplifier A / V decoder 14, and the video and audio signals are output.

On the other hand, as shown in Figure 2, the controller 19 determines whether the user selects the caption mode by using the keys of the remote control or the main body (S21).

Subsequently, when the user selects the caption mode, the determination result (S21) displays the type of digital caption currently provided on the screen and controls the image separator 13 to extract caption information included in the user information from the current image signal. (S22).

Then, it is determined whether the extracted caption information is an analog caption or a digital caption (S23).

Subsequently, in the determination result (S23), if the digital caption, the caption decoder 15 is controlled to interpret the caption information (S24), and the OSD according to the caption code is configured to be displayed on the screen (S25).

On the other hand, if the determination result (S23), the analog caption is transmitted to the NTSC encoder 16 to be inserted into the 21st line of the Even Field of the VBI (Vertical Blanking Internal) section of the external output video signal (S26). .

Then, it is determined whether the caption mode is released (S27). If the caption mode is not released, the process returns to step S22 to process the next input caption information.

The digital TV receiver according to the prior art processes the analog caption for an external output and does not perform the digital caption processing so that the digital TV receiver cannot display the caption.

Accordingly, the present invention has been made to solve the above-described problems, and provides an apparatus and method for caption information processing of a digital TV receiver capable of processing and displaying caption information regardless of analog / digital on the screen. There is a purpose.

1 is a block diagram showing an apparatus for processing caption information of a digital TV receiver according to the related art.

2 is a flowchart illustrating a caption information processing method of a digital TV receiver according to the related art.

3 is a block diagram showing an apparatus for processing caption information of a digital TV receiver according to the present invention.

4 is a flowchart illustrating a caption information processing method of a digital TV receiver according to the present invention.

Explanation of symbols for main parts of the drawings

21 tuner / demodulator 22: demultiplexer

23: video separator 24: amplek A / V decoder

25: Caption Decoder 26: NTSC Encoder

27: GUI processor 28: Mixer

29: control unit 30: caption conversion unit

The caption information processing apparatus of a digital TV receiver according to the present invention decodes analog / digital caption information included in a transport stream and converts the caption decoder constituting the OSD and the analog caption decoded by the caption decoder into digital captions. Caption converter for feeding back to the decoder, the analog caption output from the caption decoder according to the user's selection of the analog caption mode is configured to include a control unit for converting to a digital caption through the code converter.

In the caption information processing method of the digital TV receiver according to the present invention, if the user selects a caption mode, the caption information of the currently tuned channel is extracted to determine whether it is an analog caption or a digital caption. Decoding and configuring the OSD and displaying the OSD on the screen.If the result is the analog caption and the analog caption mode is selected, converting the analog caption to the digital caption and decoding and configuring the OSD to display on the screen. It is characterized by including.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the caption information processing apparatus and method of a digital TV receiver according to the present invention.

3 is a block diagram illustrating a caption information processing apparatus of a digital TV receiver according to the present invention, and FIG. 4 is a flowchart illustrating a caption information processing method of the digital TV receiver according to the present invention.

As shown in FIG. 3, the caption information processing apparatus of the digital TV receiver according to the present invention tunes a digital broadcast signal received through an antenna and converts the digital broadcast signal into a temporally multiplexed transport stream through VSB demodulation and error correction. Demultiplexer 22 and demultiplexer 22 outputting compressed video / audio information and additional information by demultiplexing the transport stream output from tuner / demodulator 21 and tuner / demodulator 21 Image separation unit 23 for extracting caption information included in the user information / audio information, the amplifier A / V decoder 24 for extending and restoring the image / audio information output from the image separation unit 23, image separation The caption decoder 25 configured to decode the caption information output from the unit 23 and extract the caption information selected by the user and to configure the OSD. A graphic user interface (GUI) processor 27 for generating user interface screen configuration information for displaying operation command processing results and the like, and an image signal and a caption decoder 25 output from the amplifier A / V decoder 24. NTSC converts the NTSC signal form by including the analog caption information output from the caption decoder 25 in the mixer 28 and the output of the mixer 28 to mix the OSD signal and the output of the GUI processor 27 output from the The control unit 29 and the caption decoder 25 for capturing the caption type according to the caption information output from the encoder 26 and the image separator 23 and controlling the caption decoder 25 to output the caption information selected by the user. And a caption converter 30 converting the analog caption code outputted from the digital signal into a digital caption code and feeding it back to the caption decoder 25.

Referring to the caption information processing method of the present invention configured as described above are as follows.

First, the control unit 29 sets the voice / video PID (Packet ID) of the channel selected by the user to the demultiplexer 22, and the demultiplexer 22 demultiplexes the corresponding audio / video signal and additional information accordingly. Transfer to 23.

Subsequently, the audio / video signal separated by the video separator 23 is decompressed and reconstructed by the amplifier A / V decoder 24, and the video and audio signals are output.

On the other hand, as shown in Figure 4, the control unit 29 determines whether the user selects the caption mode by using the keys of the remote control or the main body (S41).

Subsequently, when the user selects the caption mode (S41), the type of digital caption currently displayed is displayed by referring to a PMT (Program Map Table) and an EIT (Event Information Table) among the additional information included in the transport stream. The type of analog caption is displayed on the screen (S42), and a dual user can select a desired caption type.

Therefore, the user selects one of the captions that he / she wants to watch, that is, one of digital / analog and a language provided in the caption.

Then, the image separator 23 is controlled to extract caption information included in the user information from the current image signal (S43).

Then, it is determined whether the extracted caption information is an analog caption or a digital caption (S44).

Subsequently, in the determination result (S44), if it is an analog caption, it is determined whether the user selects the analog caption (S45).

When the user selects the analog caption, the determination result (S45) causes the analog caption output from the caption decoder 25 to be converted into the digital caption through the caption converter 30 (S46).

At this time, the caption converter 30 converts a caption code according to EIA-608, which is an analog caption standard, into a caption code according to EIA-708, a digital caption standard.

In addition, if the analog caption is not selected, the determination result (S45) is transmitted to the NTSC encoder 26 to be inserted into the 21st line of the Even Field of the VBI (Vertical Blanking Internal) section of the external output video signal. (S47).

On the other hand, if the determination result (S44), the digital caption control the caption decoder 25 to interpret the corresponding caption information (S48), and configure the OSD according to the caption code to be displayed on the screen (S49).

If it is determined that the caption mode has been released (S50), and if the caption mode has not been released, the process returns to step S43 to process the next input caption information.

The caption information processing apparatus and method of the digital TV receiver according to the present invention converts analog captions that were not previously displayed into digital captions through code conversion and displays them on the screen to display various caption display modes regardless of analog / digital captions to the user. As a result, it is possible to obtain differentiation effect from other products according to performance improvement.

Claims (3)

In a digital TV receiver, Caption decoder that decodes analog / digital caption information included in the transport stream and configures the corresponding OSD, A caption converter converting the analog caption decoded by the caption decoder into a digital caption and feeding the feedback back to the caption decoder; And a control unit for converting an analog caption output from the caption decoder into a digital caption through the code converter according to a user's selection of an analog caption mode. In the caption information processing method of the digital TV receiver, When the user selects a caption mode, extracting caption information of the currently tuned channel to determine whether the caption is an analog caption or a digital caption; If it is determined that the digital caption is decoded, decoding the caption information, configuring a corresponding OSD, and displaying the caption information on the screen; And if the analog caption is selected and the analog caption mode is selected, converting the analog caption into a digital caption, decoding the same, configuring a corresponding OSD, and displaying the caption information of the digital TV receiver. . The method of claim 2, If the user selects a caption mode, displaying the type of analog or digital caption provided in the currently tuned channel.