KR20010004144A - Method for controlling display of caption broadcasting in picture in picture mode - Google Patents

Abstract

PURPOSE: A method for controlling display of caption broadcasting in PIP(picture in picture) mode is provided for users to watch two broadcastings accurately. If voice signal of main broadcasting is selected as speaker output, voice signal of sub broadcasting is selected as caption display output automatically. If voice signal of sub broadcasting is selected as speaker output, voice signal of main broadcasting is selected as caption display output automatically. CONSTITUTION: The method for controlling display of caption broadcasting in PIP(picture in picture) mode includes several steps. A first step is to determine whether display mode of a television is PIP mode.(201) A second step is to determine whether the television is on caption display mode if display mode of a television is PIP mode.(202) A third step is to select main/sub broadcastings for speaker output and caption display in the PIP mode if the television is on caption display mode.(203,204,205) A fourth step is to display caption of the selected caption broadcasting signal not to be piled up sub scene and output audio signal of broadcasting selected as speaker output.(206,207)

Description

Method for controlling display of caption broadcasting in picture in picture mode}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a caption signal, and in particular, in a picture in picture (PIP) mode, a caption signal of a main / sub broadcast is selected and displayed according to a user's selection, and displayed on a display position of a sub broadcast screen. Correspondingly, the present invention relates to a display control method of closed caption broadcasting in a picture-in-picture mode for adaptively determining a display position of a closed caption signal.

The subtitle display function refers to a function of displaying Korean or English subtitles when watching a movie or television. Closed caption broadcasting transmits text information corresponding to an audio signal at a specific position of a video signal by a broadcasting station for a hearing impaired or a language education. The receiving side separates and extracts the corresponding character information through a television receiver having a built-in text broadcasting decoder, decodes the synthesized text information, synthesizes the signal information, and displays the text signal overlaid on the video signal.

In general, a picture-in-picture function is a function of simultaneously displaying two broadcast signals on one screen. As shown in FIG. 1, a video signal of a main broadcast and a sub broadcast is displayed on one screen of the CRT 11, The audio signal of the main broadcast is output through the speaker 12, and the audio signal of the sub broadcast is output through the headphone 13.

Therefore, according to the related art, there is a problem that a single viewer cannot simultaneously recognize the audio contents of the main broadcast and the sub broadcast in the picture-in-picture mode. In addition, in the picture-in-picture mode, the display position of the sub-screen can be changed by the user's selection. When the display position of the sub-screen is changed, the subtitle display is overlaid by the sub-screen so that it cannot be displayed normally. There was a problem.

The first technical problem to be solved by the present invention is to select the sub-broadcast audio signal as the subtitle display output automatically when the main broadcast audio signal is selected as the speaker output in the picture-in-picture mode in order to solve the above problems. The present invention provides a method for controlling the display of closed caption broadcasting in a picture-in-picture mode that automatically selects the audio signal of the main broadcast as a caption display output when selecting the audio signal as a speaker output.

The second technical problem to be solved by the present invention is a picture for displaying a subtitle signal so as not to overlap the display position of the changed sub-broadcast screen when the display position of the sub-screen in the picture-in-picture mode is changed to solve the above-mentioned problem. The present invention provides a method for controlling display of closed caption broadcasting in an in-picture mode.

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

2 is a flowchart illustrating a display control method of closed caption broadcasting in a picture in picture mode according to a first embodiment of the present invention.

3 is a flowchart illustrating a display control method of closed caption broadcasting in a picture-in-picture mode according to a second embodiment of the present invention.

In order to achieve the first technical problem, a display control method of caption broadcasting in a picture-in-picture mode according to the present invention is a method of displaying a caption signal in a picture-in-picture mode of a television. Determining whether the picture is in the picture-in-picture mode; (b) determining that the picture is in the subtitle display mode when the determination result of the step (a) is in the picture-in-picture mode; and (c) If it is determined that the subtitle display mode is in the subtitle display mode, selecting a main / sub broadcast for speaker output and subtitle display in the picture-in-picture mode; and (d) a subtitle broadcast signal selected in correspondence with the selection of step (c). Displaying the subtitles so as not to overlap with the sub-screen, and outputting audio signals of the selected broadcast to the speaker.

In order to achieve the second technical problem, a display control method of caption broadcasting in a picture-in-picture mode according to the present invention is a method of displaying a caption signal in a picture-in-picture mode of a television. (B) determining whether or not the display mode of the television is in a picture-in-picture mode by initially setting a table of coordinate values of the subtitle display so as not to overlap with a position at which the sub-screen is displayed in correspondence with the sub-screen display coordinate values; (C) determining whether the image is in the subtitle display mode when the determination result of the step (b) is in the picture-in-picture mode; or (d) when the subtitle display mode is the result of the determination in the step (c). And displaying the caption signal of the selected broadcast in the picture-in-picture mode on the screen at the coordinates initially set in step (a). And (e) displaying the caption signal at a coordinate value of a caption display corresponding to the coordinate value at which the subscreen is displayed using the table when the subscreen display position of the picture-in-picture mode is changed. Characterized by including.

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

1 is a configuration diagram of a television receiver to which the present invention is applied, and includes an antenna 101, a first tuner 102, a second tuner 103, a switching unit 104, a control unit 105, and a caption display coordinate table memory. 106, the main picture video signal processor 107, the PIP signal processor 108, the mixer 109, the data slicer 110, the data detector 111, the subtitle signal processor 112, the first audio signal processor 113, a second audio signal processor 114, and key input means 115 are provided.

First, the operation of these components is briefly described as follows.

The antenna 101 serves to receive a broadcast signal transmitted from each broadcasting station.

The first and second tuners 102 and 103 tune and demodulate the broadcast signals of the main broadcast channel and the sub broadcast channel selected by the user, respectively, among the broadcast signals of all channels received from the antenna 101, and output the demodulated signals.

The switching unit 104 switches and outputs video / audio signals input from the first and second tuners 102 and 103 according to a switching control signal of the control unit 105 according to a user's selection. For example, in the PIP mode, when the user selects the subtitle display mode, outputs the main screen voice to the speaker, and selects the sub screen audio to be displayed on the subtitle, the main screen video signal processing unit 107 transmits the first tuner of the main broadcast ( A video signal output from the 102 is selected and output, and the PIP signal processor 108 selects and outputs a video signal output from the second tuner 103 of the sub-broadcast. The audio signal output from the first tuner 102 is selected and output to the first audio signal processor 113, and the audio signal output from the second tuner 103 is selected to the second audio signal processor 114. To print. In addition, the data slicer 110 selects and outputs a video signal output from the second tuner 103.

The key input unit 115 is provided with a function key and various key buttons, for example, can be implemented by a remote control.

The control unit 105 selects an input signal of the switching unit 104 according to a key command input through the key input unit 115 and supplies the input signal to the respective external components, and rotates the PIP screen in the PIP mode. In case of input, the PIP signal processor 108 controls the sub-screen display coordinates to change the position of the sub-screen display coordinates, and reads the coordinate values from the subtitle display coordinate table memory and applies them to the subtitle signal processor 112. do.

The subtitle display coordinate table memory 106 stores subtitle display position coordinate values for each execution mode. In particular, in the PIP mode, the subtitle display position coordinate values are set and stored not to overlap with the subscreen display area according to the display coordinate position of the subscreen. .

The main screen video signal processing unit 107 converts the input video signal into R, G, and B signals after performing signal processing such as gamma correction.

The PIP signal processor 108 compresses and outputs the input video signal in accordance with the display size of the sub-screen.

In the data slicer 110, the caption signal included in the 21st line of the first field and the 284th line of the second field of the input video signal is found by counting the horizontal synchronizing signal, and separated using a masking pulse.

The data detector 111 detects digital data from the extracted analog caption signal.

The caption signal processing unit 112 reads font graphic data corresponding to character data in the input digital caption data from an internal font memory (not shown in the drawing) and outputs R, G, Outputs a B-character graphic signal.

Next, a method for controlling display of closed caption broadcasting in a picture-in-picture mode for achieving the first technical problem according to the present invention will be described with reference to the configuration of FIG. 1 in each step of the flowchart shown in FIG. 2.

In step 201, it is determined whether the television has been switched to the PIP mode.

In step 202, when the determination result of step 201 is changed to the PIP mode, it is determined whether the current execution mode is the caption display mode.

In step 203, when it is determined in step 202 that the caption display mode is selected, the first tuner 102 controls the switching unit 104 according to the switching control signal of the control unit 105 to output main screen audio to the speaker. The input audio signal is output to the first audio signal processor 113, and the video signal input from the second tuner 103 is output to the data slicer 110 in order to display subtitles.

In step 204, it is determined whether a key command for changing the closed caption display broadcast is input. That is, it is determined whether the user inputs a key command for changing the sub-screen audio signal displayed as the subtitle to the voice signal of the main screen.

In step 205, when a key command for changing the caption display broadcast is input as a result of the determination in step 204, the switching unit 104 changes the switching control signal to display the main screen audio in caption. The audio signal input from the second tuner 103 is output to the first audio signal processor 113 in order to output the video signal input from the first tuner 102 to the data slicer 103 and to output the sub-screen audio to the speaker. Output

In step 206, the caption display coordinate position is read from the caption display coordinate table memory 106 to change the coordinate value so that the caption display is not displayed in the area where the sub-screen is displayed in the PIP mode.

In step 207, the caption signal of the broadcast selected by the caption display is processed and displayed on the caption, and the audio signal of the broadcast selected by the speaker output is signal processed and output to the speaker.

The caption signal contained in the 21st line of the first field and the 284th line of the second field is extracted from the video signal selected and output by the data slicer 110 by the switching unit 104. The data detector 111 converts the input analogue caption signal into a digital signal, and then applies 2 bytes of data per line to the caption signal processor 112. The caption signal processing unit 112 separates the control code and the character data code from the received caption data, and reads the character graphic data corresponding to the character data code from an internal font memory (not shown). Thereafter, the graphic data read from the font memory is determined to correspond to the control code, and the character color, background color, attribute information, and the like are determined and output to the mixing unit 113 as R, G, and B signals. At this time, the position of the caption display is determined using the coordinates read from the caption display coordinate table memory 106. The mixing unit 109 mixes the video signal of the main screen output from the main screen video signal processing unit 107 and the video signal of the sub screen output from the PIP signal processing unit 108, and adds the subtitle signal processing unit 112 to the subtitle signal processing unit 112. ) And outputs graphic text signal. Next, the audio output signal processed by the first audio signal processor 113 is output through the speaker.

By the above operation, the audio signal of the main / sub picture is complementarily output through the speaker and the subtitle display in the PIP mode so that the viewer can recognize the audio signal of the main / sub picture together. In the PIP mode, the subtitle display position can be controlled so as not to overlap the display area of the subscreen.

Next, a method for controlling display of closed caption broadcasting in a picture-in-picture mode for achieving a second technical problem according to the present invention will be described with reference to the configuration of FIG. 1 in each step of the flowchart shown in FIG. 3. .

In step 301, the subtitle display position coordinate values are stored for each execution mode. In particular, in the PIP mode, the subtitle display position coordinate values are set so as not to overlap with the subscreen display area according to the display coordinate position of the subscreen. ).

In step 302, it is determined whether the television has been switched to the PIP mode.

In step 303, when the determination result of step 302 is switched to the PIP mode, it is determined whether the current execution mode is the caption display mode.

In step 304, when the result of the determination in step 303 corresponds to the caption display mode, the caption display coordinate table initially set as the default value of the PIP mode is read out from the caption display coordinate table memory 106.

In step 305, the caption signal graphic signal is displayed by decoding the caption signal at the coordinate value read from the caption display coordinate table memory 106.

In step 306, it is determined whether the PIP rotation key command is input to the control section 105 via the key input means 115. That is, it is determined whether the user wants to change the display position of the sub screen of the PIP by using the key button of the key input means 115.

In step 307, when the PIP rotation key command is input as a result of the determination in step 306, the control section 105 interprets the PIP rotation key command so as not to overlap with the position of the sub-screen which is changed in the subtitle display coordinate table memory 106. Read caption display coordinates.

In step 308, the caption character graphic signal is displayed at the changed caption display coordinate position read in step 307. FIG.

Therefore, when the display position of the sub-screen is changed in the PIP mode, the caption display position can be automatically changed so as not to overlap with the display area of the sub-screen.

As described above, according to the present invention, the audio signal of the subtitle display sub / main screen is determined to be complementary to the audio signal of the main / sub picture output through the speaker in the PIP mode, and not overlapped with the display area of the sub screen. By controlling the display position of the subtitles, viewers can watch the main / sub picture while simultaneously acknowledging the audio content of the main / sub picture. There is an effect that can improve the obstruction of the subtitles due to the rotation of the screen.

Claims (3)

In the subtitle signal display method in the picture-in-picture mode of the television, (a) determining whether the display mode of the television is in a picture in picture mode; (b) determining whether the image is in the subtitle display mode when the determination result of the step (a) is in the picture-in-picture mode; (c) selecting the main / sub broadcast for the speaker output and the subtitle display in the picture-in-picture mode when the determination result of the step (b) is in the subtitle display mode; And and (d) displaying the caption broadcasting signal selected according to the selection of step (c) so that the caption broadcasting signal is not overlapped with the sub-screen and outputting the audio signal of the selected broadcasting to the speaker. Display control method of closed captioning in mode. 2. The method of claim 1, wherein the speaker output and subtitle display broadcast selection of the step (c) is selected as a subtitle display broadcast when the main broadcast of the picture-in-picture mode is selected as the speaker output. When the main output is selected as the speaker output, the main broadcasting is automatically selected as the closed caption display broadcasting. In the subtitle signal display method in the picture-in-picture mode of the television, (a) initially setting and tabulating the coordinate values of the subtitle display so as not to overlap with the position at which the sub-screen is displayed corresponding to the sub-screen display coordinate values of the picture in picture mode; (b) determining whether the display mode of the television is in a picture in picture mode; (c) if the determination result of the step (b) is in the picture-in-picture mode, determining whether it is in the subtitle display mode; (d) displaying the caption signal of the selected broadcast in the picture-in-picture mode on the screen of the initially set coordinates in step (a) when the determination result of the step (c) is in the caption display mode; And (e) if the sub-screen display position of the picture-in-picture mode is changed, displaying the subtitle signal at a coordinate value of the subtitle display corresponding to the coordinate value at which the sub-screen is displayed using the table. A display control method of closed caption broadcasting in a picture-in-picture mode.