KR20080001359A - Apparatus for transmitting sub channel image of digital television - Google Patents

Abstract

A sub picture transmitting apparatus in a digital television is provided to enable a user to watch digital broadcasting by receiving a digital broadcasting signal, received through a second tuner which is not operated according as a sub screen function is not used in the television, in a local area multimedia device connected through a wireless LAN(Local Area Network). A digital television comprises first and second tuners(16,20), and outputs digital broadcasting signals received through the first and second tuners to main and sub screens. The digital television comprises a local area wireless communication unit(36) and a controller(12). The local area wireless communication unit transmits the digital broadcasting signal received through the second tuner and receives a control signal. The controller performs a control operation so as to transmit the received digital broadcasting signal through the local area wireless communication unit by controlling the second tuner by the control signal received in the local area wireless communication unit according to whether the sub screen is used or not.

Description

Subscreen transmission device of digital television {APPARATUS FOR TRANSMITTING SUB CHANNEL IMAGE OF DIGITAL TELEVISION}

1 is a block diagram schematically illustrating a television having a sub picture display function by a general picture in picture (PIP) mode.

2 is a block diagram showing a sub-screen transmission apparatus of a digital television according to the present invention.

3 is a flowchart for explaining the operation of the sub-screen transmission apparatus of the digital television according to the present invention.

   -Explanation of symbols for the main parts of the drawings-

10: remote controller 12: control unit

14: Tuning data memory 16,20: 1st, 2nd tuner

18, 22: first and second video / audio IF processing unit

24: PIP processing section 26: PIP switching output section

28: video / audio processor 30: CRT device

32: speaker 34: wireless LAN

36: multimedia device

The present invention relates to a sub-screen transmission device of a digital television, and more particularly, to a multimedia device in a peripheral through a tuner that is not used when a sub-screen is not watched in a digital television that performs a sub-screen function through two tuners. In addition to transmitting the digital broadcasting signal received to the near field communication so that the user can watch the television, the user can watch the broadcast and receive and execute the control command such as channel switching from the multimedia device. It is about.

The digitalization of information spread from the computer industry to the information and communication industry has recently been extended to television broadcast signals. Digitization of television broadcast signals will realize a two-way multimedia era in which a new paradigm that is fused with technology in the computer and communication fields is realized.

Digital broadcasting is centered around the European Digital Video Broadcasting (DVB) standard and the ATV (Advanced TV) standard of the US FCC. It complies with the ATSC standard that the United States decided as the next generation TV method, replacing the NTSC standard that symbolizes the existing analog TV.

Distinguishing digital TV from analog TV is not only a breakthrough in terms of image quality and sound quality, but also digital TV is a digital multi-function disc (DVD) player, digital camcorder, digital VCR and other IEEE 1394 interface technologies that process digital signals as well as PCs. The serial interface implemented by means of data compatibility.

Therefore, digitalization of broadcast signal will accelerate the convergence of communication, computer, and broadcasting due to the spread of media using the compressor method, and will be internationalized and multi-channel as a single media with complex functions. Above all, introducing a digital system to a broadcast signal can provide various data services that could not be realized in analog.

In addition, the digitization of a broadcast signal is performed by multiplexing and transmitting information in a vertical retrace period of a TV video signal, or by using a separate channel for character information, image information, product information, and broadcast programs for television or computer owners. Data broadcasting, which is a new media service that provides multimedia information such as an electronic program guide (EPG), may be implemented.

On the other hand, PIP (Picture in Picture) which adopts a plurality of tuners and displays a small screen (sub picture) at the same time separately from the screen (main screen) which saw the video signal of each channel tuned by the tuner. The function is commonly used.

1 is a block diagram schematically showing a television having a sub picture display function by a general picture-in-picture mode.

As shown here, a remote controller 10 for transmitting a remote control signal for selectively executing the overall function of the television, and a control unit for controlling the execution of a function corresponding to the remote control signal transmitted from the remote controller 10 ( 12), and tuning data for all channels tuneable in the television are stored and accessed by the tuning data memory 14, which is accessed by the control section 12. FIG.

Then, the first tuner 16 which performs the tuning of the channel corresponding to the tuning data VT1 applied from the control unit 12, and the video / audio signal component of the channel tuned by the first tuner 16 are predetermined. A first video / audio IF processing unit 18 for performing IF conversion processing at an intermediate frequency of the second channel, a second tuner 20 for performing channel tuning corresponding to the channel selection data VT2 applied from the control unit 12, And a second video / audio IF processing unit 22 for IF converting the video / audio signal components of the channel tuned by the second tuner 20 by a predetermined intermediate frequency.

In addition, when the PIP mode is set, the video / audio IF signal selected by the second tuner 20 in response to the PIP control signal applied from the control unit 12 and applied by the second video / audio IF processing unit 22 is output. For example, the PIP processing unit 24 performs compression processing to process the sub picture signal, and the PIP processing unit 24 performs timing matching with the switching signal S / W of the sub picture signal applied from the control unit 12 in the PIP mode. PIP switching output section 26 for switching the sub picture signal.

Then, only the video / audio IF signal processed by the first video / audio IF processor 18 is reproduced and applied to the CRT device 30 and the speaker 32, or the first video / audio IF is set when the PIP mode is set. The video / audio processing unit 28 for mixing the sub picture signal output from the PIP switching output unit 26 to the CRT device 30 to reproduce the video / audio IF signal processed by the processing unit 18 to be reproduced. Is made of.

Therefore, when a specific channel number is designated by the remote controller 10 in the state where the PIP mode is not set by the remote controller 10, the control unit 12 selects the tuning data VT1 for the channel number of the tuning target. The first video / audio signal component of the channel tuned by the first tuner 16 is IF-converted by the first video / audio IF processing unit 18. The video / audio processor 28 decodes and reproduces the R / G / B color component and the audio signal, and the reproduced video signal is applied to the CRT device 30 to reproduce the audio signal. Is output via

In this way, while the video / audio signal of the channel tuned by the first tuner 16 is output through the CRT device 30 and the speaker 32, the remote control signal for setting the PIP mode from the remote controller 10 and its When the channel number of the PIP mode is transmitted, the control unit 12 accesses the tuning data VT2 corresponding to the channel number from the tuning data memory 14 and applies it to the second tuner 20 and the PIP processing unit 24. ) To apply the PIP control signal. Accordingly, the video / audio signal component of the channel tuned by the second tuner 20 is IF converted by the second video / audio IF processing unit 22 and applied to the PIP processing unit 24, and the PIP processing unit 24 The video / audio IF signal applied by the second video / audio IF processing unit 22 is compressed to a sub-screen size and applied to the PIP switching output unit 26.

Then, the PIP switching output unit 26 is timing-matched to the switching signal S / W of the sub-screen signal applied from the control unit 12 and outputs to the image / audio processing unit 28. Accordingly, the image / audio processing unit 28 processes the video signal of the channel tuned by the first tuner 16 as the main picture signal, and processes the video signal of the channel tuned by the second tuner 20 as a sub picture signal, thereby processing the CRT device 30. Will print). At this time, the audio signal of the sub-screen may not be output, but the audio signal of the sub-screen may be output according to the selection.

By the way, when the user does not set the PIP mode, the second tuner 20 remains redundant without performing any operation, but there is a problem in that the utilization of the tuner is inferior as the device capable of utilizing the same is not provided.

On the other hand, multimedia devices are equipped with an MPEG decoder for playing videos, so that not only can you watch videos but also have a wireless LAN to access the Internet and surf the Internet, but it does not have a built-in digital tuner. There is a problem that can not watch digital broadcast.

The present invention was created to solve the above problems, and an object of the present invention is to provide a multimedia around a tuner that is not used when a sub-screen is not used in a digital television that performs a sub-screen function through two tuners. Sub-screen transmission of digital television that transmits the digital broadcasting signal received by the device to watch the broadcast by short-range wireless communication and receives and executes the control command such as channel switching from the multimedia device. In providing a device.

According to an aspect of the present invention, there is provided a digital tuner having a first to second tuner and outputting a digital broadcast signal received through the first to second tuners to a main screen and a sub-screen. A short range wireless communication unit for transmitting a digital broadcast signal received through the control unit and receiving a control signal, and a digital broadcast signal received by controlling a second tuner by a control signal received from the short range wireless communication unit according to whether a sub-screen is used. Characterized in that it further comprises a control unit for controlling to be transmitted through the wireless communication unit.

In the present invention, the short-range wireless communication unit is characterized in that the wireless LAN.

When the sub-screen is used in the present invention, it is characterized in that the transmission through the short-range wireless communication unit.

When the sub-screen is used in the present invention, it is characterized by limiting a channel switching control command received from the short range wireless communication unit and transmitting a digital broadcast signal received through the second tuner controlled by the sub-screen function.

The present invention is characterized in that connected to the multimedia device having a short range wireless communication unit of the same standard through the short range wireless communication unit.

According to the present invention, the digital television having two tuners can selectively control the extra tuner according to the use of the sub picture function, as well as control the extra tuner for the short range wireless broadcast. By transmitting through a communication unit, a digital broadcast can be viewed through a multimedia device without a built-in digital tuner.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and the same parts as in the prior art use the same reference numerals and names. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and those skilled in the art will be capable of many modifications within the technical spirit of the present invention.

2 is a block diagram showing a sub-screen transmission apparatus of a digital television according to the present invention.

Referring to the configuration of the sub-screen transmission apparatus of the digital television according to the present invention as shown here, the control unit 12 has a first to second tuners 16 and 20 shown in FIG. Not only outputs the digital broadcast signal received through the first to second tuners 16 and 20 through the video / audio processing unit 28, but also by the PIP processing unit 24 and the PIP switching output unit 26. It is the same as a television for processing and outputting screens and sub-screens.

However, a short-range wireless communication unit for transmitting a digital broadcast signal received through the second tuner 20 and receiving a control signal, the wireless LAN 34 is further provided, and the control unit 12 wirelessly determines whether to use the sub-screen. The second tuner 20 is controlled by the control signal received from the LAN 34 to control the digital broadcast signal received through the wireless LAN 34.

In this case, the video / audio signal output from the multimedia apparatus 36 connected through the wireless LAN 34 may be received and output through the video / audio processor 28 of the television.

Meanwhile, the multimedia apparatus 36 that receives and receives the digital broadcast signal received through the second tuner 20 is connected to the wireless LAN 34 of the television to transmit and receive data and control signals. And a video / audio processor 362 for decoding the digital broadcast signal received through the wireless LAN 361, and an output unit for outputting the video and audio signals decoded by the video / audio processor 362. 365, a storage unit 364 for storing the video and audio signals processed by the video / audio processing unit 362, a video, and the like, and controlling the overall operation of the multimedia device 36 and controlling the wireless LAN 361. The microcomputer 363 for controlling the operation of the wireless LAN 361 and the image / audio processing unit 362 and the storage unit 364 to control the second tuner 20 of the connected television through It is provided.

Therefore, the digital broadcasting signal received through the second tuner 20 which does not operate because the sub-screen function is not used in the television is received by the multimedia device 36 connected to the wireless LAN 34 to watch the digital broadcasting. To be able to.

As such, when the sub-screen function is not used in the television, the multimedia apparatus 36 allows the multimedia apparatus 36 to switch while watching the channel of the second tuner 20.

However, when the sub picture function is used in a television, the control command from the multimedia device 36 connected through the wireless LAN 34 is limited, and the digital broadcasting signal received in the channel selected by the sub picture function is unilaterally transmitted. Do it.

When receiving a digital broadcast signal transmitted in this way, a plurality of multimedia devices 36 connected to the wireless LAN 34 may receive the digital broadcast signals to watch television.

In this case, when using the sub-screen function, the transmission of the digital broadcast signal through the wireless LAN 34 may be blocked so that the multimedia apparatus 36 connected to the wireless LAN 34 cannot be viewed.

This operation will be described below with reference to a flowchart for explaining the operation of the sub-screen transmission apparatus of the digital television according to the present invention shown in FIG.

First, an operation in a state in which the multimedia apparatus 36 is not connected through the wireless LAN 34 is the same as that of a general digital television (S10).

However, when the multimedia device 36 is connected via the wireless LAN 34, the channel of the second tuner 20 is connected to the multimedia device 36 connected through the wireless LAN 34 depending on whether the sub-screen function is used in the television. By restricting control commands such as switching, the television preferentially processes the control through.

In this way, it is determined whether the sub-screen function of the television is used (S12). When the sub-screen is not used, when the channel is switched in the multimedia device 36 connected through the wireless LAN 34, the second tuner 20 Channel switching is performed (S14).

In addition, the video / audio processor of the multimedia apparatus 36 transmits the digital broadcast signal received through the second tuner 20 to the wireless LAN 34 and receives it from the multimedia apparatus 36 connected to the wireless LAN 34. Decoded through 362 to watch digital broadcast through output 365.

However, when the sub-screen function is used in the television, since the channel is set by the sub-screen function, the multimedia device 36 connected through the wireless LAN 34 is limited so that the channel of the second tuner 20 cannot be switched. do.

In this case, even if a control command such as channel switching is limited, the multimedia screen 36 may be watched through the multimedia apparatus 36 by transmitting the digital broadcast signal received through the second tuner 20 through the wireless LAN 34. (S18).

On the other hand, when the sub-screen function is used in the television, the multimedia apparatus 36 connected through the wireless LAN 34 in accordance with the use of the second tuner 20 by the sub-screen function may perform digital broadcasting through the second tuner 20. You can also block viewing to restrict it.

On the other hand, the multimedia device 36 transmits the video stored in the storage unit 364 to the television through the wireless LAN 361 of the multimedia device 36 to transmit the CRT device (the video / audio processing unit 28 of the television) ( 30 or through the speaker 32.

As described above, the present invention provides a digital broadcast signal that is received so that a multimedia apparatus can be viewed on a multimedia device through a tuner that is not used when the sub-screen is not viewed on a digital television that performs a sub-screen function through two tuners. In addition to transmitting broadcasts through short-range wireless communication, the multimedia device can receive and execute control commands such as channel switching, thereby increasing the utilization of the tuner, and enabling digital broadcasting to be viewed through nearby multimedia devices. There is an advantage.

Claims (5)

A digital television having a first to second tuner and outputting a digital broadcast signal received through the first to second tuners on a main screen and a sub-screen, A short range wireless communication unit for transmitting the digital broadcast signal received through the second tuner and receiving a control signal; The controller controls the second tuner to be transmitted through the short range wireless communication unit by controlling the second tuner according to a control signal received from the short range wireless communication unit according to whether the sub screen is used. Sub-screen transmission device for a digital television, characterized in that further comprising. The apparatus of claim 1, wherein the short range wireless communication unit is a wireless LAN. The apparatus of claim 1, wherein when the sub-screen is used, transmission through the short range wireless communication unit is blocked. The method of claim 1, wherein when the sub-screen is used, the channel switching control command received from the short range wireless communication unit is restricted and the digital broadcast signal received through the second tuner controlled by the sub-screen function is transmitted. Sub-screen transmission device of digital television. The apparatus of claim 1, wherein the near field communication unit is connected to a multimedia apparatus having a near field communication unit having the same standard.

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