KR19990042499A - Sub-screen Playback Control Method According to Detection of End of Broadcasting Program in Multi-screen Television - Google Patents

Abstract

According to the present invention, when a subtitle on a sub-screen on a main screen is detected in a multi-screen television, when a moving subtitle is detected, the play area of the sub-screen is automatically turned off so that the sub-screen according to the multi-screen playback function is detected. Provided is a sub-screen reproduction control method according to a broadcast program termination detection of a multi-screen television to release a screen reproduction operation.

To this end, according to the present invention, the multi-screen mode switching unit 10 transmits a video signal of multiple broadcast channels simultaneously tuned by the first and second tuners 2 and 4 according to the mode execution of the multi-screen playback mode. A main / sub picture reproducing method of a multi-screen television, in which a signal path is formed as a reproduction object of a screen and reproduced simultaneously through a main picture and a sub picture, wherein the first and second tuners 2 and 4 are simultaneously tuned. The video signal supplied as the sub picture reproduction target by the multi-screen mode switching unit 10 among the plurality of broadcast channels is digitally converted by the ADC 24 and buffered and stored in the video memory 26, and then the character extracting unit 28 is stored. Detects the screen display state of the moving subtitle signal that appears as the character extraction operation and the end of the broadcast program by the character movement detecting unit 30 according to the movement of the character position, and determines the end state of the broadcast program. Room recycled On the basis of the detected value of the end state of the program, the multi-screen playback mode for the multi-screen mode switching unit 10 is canceled, and tuning of the sub-screen playback target broadcast channel by the second tuner 4 is stopped. And a process of turning off the playback of the sub-screen.

Description

Sub-screen Playback Control Method According to Detection of End of Broadcasting Program in Multi-screen Television

The present invention relates to a sub-screen playback control method according to the detection of the end of a broadcast program of a multi-screen television, and more particularly, to a sub-screen in a multi-screen television capable of simultaneous playback through the main / sub-screen of the video according to multiple broadcast channels The present invention relates to a sub-screen playback control method according to a broadcast program end detection of a multi-screen television that detects an end state of a broadcast program corresponding to a predetermined broadcast channel and automatically releases the sub-screen.

In general, in a television with a general single tuner, RF signals of a specific single broadcasting channel are tuned among a plurality of broadcasting channels transmitted from a plurality of television stations, and then reproduced through a CRT screen and a speaker through video / audio processing. As such, the ability to tune one particular broadcast channel by such a single tuner is not easy to grasp the contents of the broadcast program for other broadcast channels, so that the viewer repeatedly performs channel switching and desires another broadcast channel. It was inconvenient to know the contents of the program.

In order to alleviate the inconvenience caused by the adoption of such a single tuner, in recent years, a multi-screen playback function such as a picture in picture (PIP) playback function has been adopted, so that a plurality of tuners can be provided at the same time. Separated by the main screen video / audio processing means for processing the video / audio signal to be reproduced on the main screen and the subscreen video / audio processing means for processing the video / audio signal to be reproduced on the subscreen by tuning. After the video / audio processing is performed, the video signal is simultaneously played through the main screen and the sub-screen of the CRT screen, and the audio signal can be played separately through the speaker and the wired or wireless headphones. .

On the other hand, according to the multi-screen playback function that can simultaneously search for broadcast programs according to a plurality of broadcast channels in accordance with the reproduction of the main / sub-screen, a plurality of broadcast channels are tuned through a plurality of tuners, and the tuned plurality of broadcasts The sub-screen having a smaller picture size, while allocating the broadcast signal of one channel among the channels as a playback signal on the main screen of the normal picture size, and simultaneously assigning the broadcast signal of the other channel to the main picture. By assigning as a playback signal of a sub screen, it is employed as a picture in picture (PIP) playback function that enables simultaneous viewing of multiple channels through simultaneous playback of the main / sub picture from a CRT screen. According to the PIP playback function, a plurality of sub-screens are formed on a single main screen to enable simultaneous playback of at least three or more broadcast channels.

However, in a multi-screen television having a multi-screen playback function such as a PIP playback function, when a video of another broadcast channel is simultaneously played on the sub-screen while the video of a predetermined broadcast channel is reproduced on the main screen, When the broadcast program of the broadcast channel to be reproduced is terminated, it is inconvenient to manually turn off the sub-screen by repetitive key operation by the user or to select a broadcast channel having a desired broadcast program.

Accordingly, the present invention has been made in view of the above-described circumstances, and when detecting a state in which a moving subtitle appears as a predetermined broadcast program played on a sub-screen on a main screen is terminated in a multi-screen television, the playback area of the sub-screen is detected. It is an object of the present invention to provide a sub-screen playback control method according to a broadcast program termination detection of a multi-screen television which is automatically turned off to release the sub-screen playback operation according to the multi-screen playback function.

In order to achieve the above object, according to the sub-screen playback control method according to the broadcast program termination detection of the multi-screen television according to the present invention, a plurality of simultaneous tuned by the first and second tuners in accordance with the mode execution of the multi-screen playback mode A main / sub picture reproducing method of a multi-screen television, in which a video signal of a broadcast channel is formed by a multi-screen mode switching unit as a reproduction target of a main / sub picture and simultaneously reproduced through a main picture and a sub picture. A video signal supplied as a sub picture reproduction target by a multi-screen mode switching unit among a plurality of broadcast channels simultaneously tuned by the first and second tuners is digitally converted by the ADC, buffered and stored in the video memory, and then the characters of the character extracting unit are stored. The screen display state of the moving subtitle signal that appears in accordance with the extraction operation and the end of the broadcast program by the character movement detection unit is changed according to the movement of the character position. Determine the end state of the broadcast program, release the multi-screen playback mode for the multi-screen mode switching unit based on the detected value of the end state of the broadcast program reproduced on the sub-screen, and the second tuner. The sub-screen playback control method according to the detection of the end of the broadcast program of the multi-screen television comprising the step of turning off the playback of the sub-screen by stopping the selection of the sub-screen playback target broadcast channel.

According to the present invention configured as described above, in a multi-screen television capable of simultaneous reproduction of video signals according to multiple broadcast channels through the main / sub picture, a moving subtitle is terminated as the broadcast program corresponding to a predetermined broadcast channel to be reproduced on the sub picture ends. Is generated, and when the moving state on the screen of the moving subtitle is determined, the multi-screen playback mode is released to turn off the playback state of the sub-screen so that only the main screen can be played.

1 is a block diagram showing a state in which a sub-screen playback control method according to the broadcast program end detection according to the present invention is applied to a multi-screen television;

FIG. 2 is a diagram illustrating an example in which a detection state of a moving subtitle that appears as the end of a broadcast program reproduced on a sub-screen is displayed according to a preferred embodiment of the present invention;

3 is a flowchart illustrating operation in accordance with a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2, 4: tuner, 6, 8: video IF section,

10: multi-screen mode switching unit, 12, 16: video amplifier,

14, 18: image processing unit, 20: multi-screen synthesis unit,

22: video output unit, 24: ADC,

26: image memory, 28: character extraction unit,

30: character movement detection unit, 32: function setting unit,

34: control unit.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a state in which a sub-screen playback control method according to the end of broadcast program according to the present invention is applied to a multi-screen television. In the apparatus of the present invention, reference numerals 2 and 4 denote control units 34 to be described later. In accordance with the multi-screen playback mode from), the channel tuning data for tuning a plurality of broadcast channels is respectively received, and the respective RF channels of the corresponding broadcast channel are tuned among the plurality of broadcast channels in the receiving antenna. A first and a second tuner for mixing a signal with a local oscillation frequency signal generated by the channel selection data and outputting it as an intermediate frequency signal, and 6 and 8 respectively represent image signals of a plurality of broadcast channels having the intermediate frequency signal type. First and second image IF portions to be subjected to intermediate frequency amplification are shown.

Also, reference numeral 10 denotes two screens for television broadcast signals of multiple broadcast channels through the first and second video IF units 6 and 8 according to the multi-screen playback mode by mode control of the controller 34 to be described later. A multi-screen mode switching unit is provided to provide a switching path for selectively controlling the main / sub picture reproduction state of the image.

In addition, reference numeral 12 denotes a first video amplifying unit for multi-stage signal amplifying the video signal according to the main screen of the main / sub-screen through the multi-screen mode switching unit 10 up to an amplification level capable of image signal processing, 14 Denotes a first image processor which separates the signal-amplified image signal into a luminance signal and a color signal and processes the image signal so that the entire image can be reproduced on the main screen through luminance adjustment and color demodulation.

In addition, reference numeral 16 denotes a second image amplifier which amplifies the video signal according to the sub-screen among the two screens through the multi-screen mode switching unit 10 up to an amplification level capable of processing the video signal in multiple stages, and 18 denotes the above. After the video signal according to the multi-stage signal amplification process is divided into the luminance signal and the color signal, the luminance signal and the color demodulation process are performed, and the luminance signal and the color signal are processed by the first image processor 14. A second image processing unit which performs digital signal processing so as to be synchronized with a synchronization signal from a video signal according to a screen and performs the same data compression as the video of the main screen.

Also, reference numeral 20 denotes a multi-screen synthesis for performing image synthesis for reproducing a video signal corresponding to a main screen and a sub-screen through the first and second image processing units 14 and 18 on an accurate screen area on two screens. 22 denotes an image output unit which is amplified and driven by an image signal through the multi-screen synthesizing unit 20 to output two screens on the CRT screen.

Reference numeral 24 denotes an ADC for sampling, quantizing, and digitally converting an image signal corresponding to a sub-screen from the second image amplifier 16, and 26 denotes an enable signal from the controller 34, which will be described later. EN) enables the recording operation, and repeatedly stores, buffers and outputs an image signal according to the sub-picture subjected to the digital conversion in image frame units.

Reference numeral 28 denotes a character extracting unit for extracting characters of the caption signal included in the image signal according to the sub-screen output from the image memory 26 in units of image frames, and 30 denotes the character extracting unit 28. 2 shows a character movement detection unit for detecting the subtitle signal extracted by the character, i.e., the moving subtitle 38 generated in accordance with the end of the broadcast program reproduced on the sub picture area 36 as shown in FIG.

Further, reference numeral 32 denotes a function setting section which consists of a matrix button section provided in a predetermined portion of a remote control remote control or a main body of the main body, and inputs the execution or setting state of the overall functional operation related to the multi-screen playback mode of the multi-screen television. .

Further, reference numeral 34 denotes a control unit which executes and controls overall function operations related to the multi-screen playback mode in response to a key input from the function setting unit 32. The control unit 34 has a plurality of broadcast channels on the main / sub-screen. When the subtitle 38 is detected from the character movement detector 30 by ending the broadcast program corresponding to the image reproduced through the sub-screen area 36 in the state of being reproduced, the first and second tuners Control of turning off the sub-screen area 36 by releasing the mode switching state for the multi-screen mode switching unit 10 together with the tuning stop for the tuner for tuning the sub-screen broadcast channel in (2,4). It works.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 3.

First, when a plurality of broadcast channels are tuned through the first and second tuners 2 and 4 while the multi-screen play mode is executed by the key operation of the function setting unit 32 in step 40, the multi-screen mode switcher The plurality of video signals of the main / sub picture reproduction object passed through the mode switching of (10) are subjected to signal amplification processing by the first and second video amplifiers 12 and 16 and the first and second video processing units, respectively. The sub-screen area 36 on the main screen is designated by the multi-screen synthesizing unit 20 through the image processing through 14 and 18 to simultaneously reproduce the images on the CRT screen.

In this state, the process proceeds to step 41 where the ADC 24 receives the image signal corresponding to the sub-screen from the second image amplifier 16 to perform digital conversion, and the image memory 26 converts the digitally converted image. Since the signal is repeatedly stored in the image frame unit and read out, the character extractor 28 extracts the caption signal from the image signal in the image frame unit read out from the image memory 26.

Accordingly, in step 42, the character movement detector 30 detects whether the subtitle signal extracted by the character extractor 28 is a moving subtitle and determines it.

On the other hand, as a result of the determination in step 42, it is determined that the character movement detecting unit 30 detects the moving subtitle 38, which is indicated by the termination of the broadcast program of the sub-screen image reproduced on the corresponding sub-screen area 36. If the control proceeds to step 43, the channel tuning is stopped for the tuner which tunes the broadcasting channel of the sub picture reproduction target among the first and second tuners 2 and 4, and the multi-screen mode switching unit 10 The mode switching state of the screen play mode is canceled.

According to the present invention made as described above, in the state of reproducing a broadcast program according to a predetermined broadcast channel on a sub-screen in a multi-screen playback mode in a multi-screen television, a moving subtitle that appears as the end of the broadcast program is detected. By exiting the screen playback mode to release the playback state of the sub-screen, the release of the sub-screen by the end of the desired broadcast program can be easily performed even if the user does not have to repeatedly perform key operation. Will have

Claims (1)

Video signals of multiple broadcast channels simultaneously tuned by the first and second tuners 2 and 4 according to the mode execution of the multi-screen playback mode are used as the playback targets of the main / sub picture by the multi-screen mode switching unit 10. In the main / sub-screen playback method of a multi-screen television, the signal path is formed and played simultaneously through the main screen and the sub-screen, The ADC 24 digitally converts a video signal supplied as a sub picture reproduction target by the multi-screen mode switching unit 10 among a plurality of broadcast channels simultaneously tuned by the first and second tuners 2 and 4. The screen display state of the moving subtitle signal, which is buffered and stored in the image memory 26 and appears in accordance with the character extraction operation of the character extraction unit 28 and the termination of the broadcast program by the character movement detection unit 30, is used for the movement of the character position. Determine the end state of the broadcast program based on the detected value of the end state of the broadcast program reproduced on the sub-screen, and cancel the multi-screen play mode for the multi-screen mode switching unit 10, Ending the broadcast program of the multi-screen television characterized in that the step of stopping the selection of the sub-screen playback target broadcast channel by the second tuner 4 to turn off the playback of the sub-screen Sub-screen playback control method by detection.