KR100816287B1 - Method and apparatus for providing of multi-channel digital broadcasting data - Google Patents

Abstract

The present invention provides a multi-channel digital broadcast data providing method and apparatus for providing a multi-channel corresponding to the number of digital broadcast channels, thereby supporting a simple and fast channel movement, the present invention provides a digital broadcast data A method of providing digital broadcast data, the method comprising: simultaneously or sequentially receiving digital broadcast data for one main channel and at least one subchannel; Resizing real-time broadcast data for the one main channel and at least one still image for the at least one sub-channel corresponding to the position and size of the screen divided by the number of multi-channels; And simultaneously outputting the real-time broadcast data and the at least one still image on one screen. Accordingly, the present invention can display the latest image information of the multi-channel at the same time by updating the image information of the sub-channel displayed together with the main channel at a predetermined cycle.

Digital Broadcasting, Multi-Channel, Sync, I-Frame

Description

Multichannel digital broadcasting data providing method and apparatus therefor {METHOD AND APPARATUS FOR PROVIDING OF MULTI-CHANNEL DIGITAL BROADCASTING DATA}

1 is a schematic configuration diagram of a conventional digital broadcasting system;

2 is a schematic block diagram of a digital broadcast receiving apparatus according to a first embodiment of the present invention;

3 is a schematic block diagram of a digital broadcast receiving apparatus according to a second embodiment of the present invention;

4 is a diagram illustrating an example of an I-frame information management table for managing I-frame information of a subchannel in a digital broadcast receiving apparatus according to the first and second embodiments of the present invention.

5 is a diagram illustrating an example of a method of simultaneously outputting a multi-channel image using a digital broadcasting receiver according to the first and second embodiments of the present invention;

6 is a schematic block diagram of a digital broadcast receiving apparatus according to a third embodiment of the present invention;

7 is a schematic block diagram of a digital broadcast receiving apparatus according to a fourth embodiment of the present invention;

8 is a diagram illustrating an example of a method of simultaneously outputting a multi-channel image by using a digital broadcast receiving apparatus according to a third and fourth exemplary embodiment of the present invention;

9 illustrates configuration examples of MPEG image data processed by a digital broadcast receiving apparatus according to the first to fourth embodiments of the present invention;

10A and 10B are diagrams illustrating examples of screens for multi-outputting images of multiple channels in the digital broadcasting reception apparatus according to the first to fourth embodiments of the present invention.

11 and 12 illustrate examples of a method of simultaneously outputting broadcast data of multiple channels using a DMB receiving apparatus according to an embodiment of the present invention;

13 and 14 illustrate examples of an operation method by an event occurring during multi-channel broadcast data display using a DMB receiving apparatus according to an embodiment of the present invention;

15 schematically illustrates an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention;

16 is a diagram schematically illustrating an operation structure for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention;

17 is a diagram schematically showing an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention;

18 is a view schematically showing an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal, and more particularly, to a channel switching method and apparatus in a digital broadcasting portable terminal capable of supporting channel movement more easily and correctly when switching digital broadcasting channels by simultaneously providing images of multiple channels.

Digital Multimedia Broadcasting (hereinafter referred to as 'DMB') is a broadcasting service that digitally modulates various multimedia signals such as voice and video, and is particularly a personal portable receiver or a vehicle receiver equipped with an omnidirectional receiving antenna. Through a broadcast service that allows the user to receive a variety of multimedia broadcast on the go.

Meanwhile, as a technology of mounting a memory capable of storing a large amount of digital multimedia (eg, a video, a music video, etc.) has been developed, and a mobile communication terminal has been widely used, a mobile communication terminal (eg, DMB) capable of receiving the DMB data has recently been developed. Phone) has been developed and commercialized. Thus, users can watch DMB using the DMB phone while on the move.

On the other hand, when the user who is watching the DMB wants to search for information about channels other than the channel currently being viewed or to move to another channel that the user desires, the user searches the entire screen while the users move one by one. After that, the user can move to the desired channel again to watch the broadcast of the corresponding digital broadcasting channel. In addition, broadcast program information or channel information (hereinafter referred to as 'broadcast information') provided with digital broadcast data provides only text-based information such as channel name or broadcast time, so that the user intuitively recognizes broadcast information of the corresponding channel. I could not.

Recently, in order to solve this problem, a method of providing broadcast information based on an image has been proposed. The conventional method of providing image-based broadcast information provides broadcast information of a channel on which the program is broadcasting using image data preset for each program, or extracted from video data received for each channel at the time when the broadcast information is requested. Broadcast information of a corresponding channel is provided using image data.

That is, conventionally, broadcast information of a corresponding channel is provided using fixed image data for each program. Therefore, conventionally, it is not possible to provide broadcast information that changes with time. As a result, the user could not know the latest image information of the program being broadcast for each channel. Therefore, when selecting a channel, it was not possible to refer to the latest video information of the program being broadcast on the channel.

In order to solve the above problems, the present invention is to provide a multi-channel digital broadcast data providing method and apparatus for simplifying the user's channel selection by displaying the latest image information of the multi-channel at the same time.

In addition, the present invention provides a multi-channel digital broadcast data providing method and apparatus that can support the digital broadcast channel movement and selection more easily and quickly by dividing the screen by the number of received digital broadcasting channels in the form of a thumbnail (thumbnail). Is in.

The present invention also provides a multi-channel digital broadcast data providing method and apparatus capable of simultaneously providing the multi-channel digital broadcast information with one real-time image information, the latest image information of each channel except the main channel.

In addition, the present invention performs a main / sub-channel switching by displaying a main channel screen for outputting real-time image information and a plurality of sub-channel screen for displaying the latest image information, and by selecting one of the sub-channel and the main channel screen. A method and apparatus for providing channel digital broadcast data are provided.

In order to achieve the above objects, a digital broadcast receiving apparatus provided by the present invention includes a digital broadcast receiving unit for simultaneously receiving digital broadcast data for two or more channels; A digital broadcast output unit for simultaneously outputting real-time broadcast data of one channel of the two or more multi-channels and still images of channels other than the one channel on one screen; A still image updating unit updating the still images of the other channels at a predetermined period; A channel setting controller configured to set reception channel information of the digital broadcasting receiver; And a scaler for resizing and outputting real-time broadcast data and still images corresponding to the position and size of a screen divided by the number of multi-channels.

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The channel setting controller may change and set the reception channel information of the subchannel based on a preset channel change condition, store a channel list including a plurality of channel information and include the channel list in the channel list based on the channel change condition. It is preferable to select one or more channels sequentially and set as a reception channel for a subchannel.

At this time, the channel list includes a predetermined number or more of channel information as the number of subchannels to be simultaneously output on one screen, and the channel information is automatically generated based on a plurality of channel information selected by a user or previous viewing information. It is preferably one of the preferred channel information of.

The channel change condition may be any one of a user input of a change request, a preset channel change period, and I-frame data detection of a current reception channel.

In addition, the channel setting controller may set a reception channel based on channel information input when the channel change request is input in response to a user input of a channel change request.

The still image updating unit may further include: an I-frame detector which detects I-frame data from the subchannel data at every I-frame transmission period of the subchannel data; And an I-frame information storage unit for updating and storing I-frame data for a corresponding subchannel in response to the detection of the I-frame data.

In addition, the I-frame detector may pre-store I-frame transmission period information of the subchannel data and detect data received for each period as I-frame data, or compare the sizes of the received data streams so that their size is relatively small. It is desirable to detect large data as I-frame data.

In addition, the I-frame storage unit preferably stores and updates I-frame data for each channel set as a reception channel for the subchannel.

The digital broadcast output unit may include a main channel buffer unit configured to store real-time broadcast data for the main channel; And an image synthesizer configured to generate screen output information by using real-time broadcast data stored in the main channel buffer unit and I-frame data stored in the I-frame information storage unit.

In this case, the image synthesizing unit sequentially selects the same number of I-frame data as the preset number as the number of subchannels to be simultaneously output on the screen from the I-frame information storage unit and synthesizes the video signal of the main channel. It is desirable to generate screen output information.

The digital broadcast receiver may further include: a demultiplexer for separating digital broadcast signals for each of two or more simultaneously received channels; And a first switch for changing a main channel transmission path and a subchannel transmission path at an output terminal of the demultiplexer.

The channel setting control unit may output a control signal for changing a transmission path of the first switch based on a user's main / sub channel switching request or a pre-stored main / sub channel switching condition.

In this case, the main / sub channel switching condition is preferably a main / sub channel switching period or a main / sub channel switching time.

The digital broadcast output unit may include a main channel buffer unit configured to store real-time broadcast data for the main channel; A subchannel buffer for storing real-time broadcast data for the subchannels; An image synthesizer configured to generate screen output information using real-time broadcast data stored in the main channel buffer unit or sub-channel buffer unit and I-frame data stored in the I-frame information storage unit; And a switch unit connecting an output terminal of either the main channel buffer unit or the subchannel buffer unit to an input terminal of the image synthesis unit, and wherein the still image update unit selects either the main channel transmission path or the subchannel transmission path. Preferably, the apparatus further includes a second switch connected to an input terminal of the I-frame detector.

The channel setting controller may output a control signal for changing the transmission paths of the switch unit and the second switch based on a user's main / sub channel switching request or a pre-stored main / sub channel switching condition.

At this time, the switch unit connects an output terminal of either the main channel buffer unit or the subchannel buffer unit to an input terminal of the image synthesizer based on a control signal of the channel setting controller, and the second switch transmits the main channel. When the path and the input terminal of the I-frame detector is connected The output terminal of the sub-channel buffer is connected to the input terminal of the image synthesis unit, and the second switch connects the transmission path of the sub-channel and the input terminal of the I-frame detector Preferably, the output terminal of the main channel buffer is connected to the input terminal of the image synthesis unit.

The second switch may connect any one of the main channel transmission path and the sub channel transmission path to an input terminal of the I-frame detector based on a control signal of the channel setting controller, wherein the switch unit includes the main channel buffer unit. When the sub-channel transmission path is connected to the input terminal of the image synthesis unit, the sub-channel transmission path is connected to the input terminal of the I-frame detection unit, and when the switch unit is connected to the input terminal of the image synthesis unit, the main channel transmission path is It is preferable to connect to the input terminal of the I-frame detector.

In addition, the digital broadcast output unit preferably outputs the real-time broadcast data and the still image by dividing each into a specific area.

The apparatus for receiving digital broadcasting further includes an input unit for receiving input of user selection information for selecting one of the specific regions, and the digital broadcasting output unit is based on the display area selection information of the user through the input unit. It is preferable to perform any one of subchannel switching or enlarged display of the corresponding region.

In addition, when the display area selection information for the main channel region is input, the digital broadcast output unit preferably enlarges the main channel region based on pre-stored enlarged display information.

In addition, when the display area selection information for one of the subchannel areas is input, the digital broadcasting output unit may switch the corresponding subchannel and the main channel.

In order to achieve the above objects, a method of providing digital broadcast data according to an embodiment of the present invention includes the steps of simultaneously or sequentially receiving digital broadcast data for one main channel and at least one subchannel; Resizing real-time broadcast data for the one main channel and at least one still image for the at least one sub-channel corresponding to the position and size of the screen divided by the number of multi-channels; And simultaneously outputting the real-time broadcast data and the at least one still image on one screen.

In this case, the digital broadcast data providing method may include: dividing the real-time broadcast data and the still image into a specific display area and outputting the divided display areas; Receiving user selection information for selecting one of the specific display areas; And performing one of main / sub channel switching or enlarged display of the corresponding area based on the display area selection information of the user.

In addition, the screen is divided according to the number of received digital broadcast data, the real-time broadcast data is displayed on one of the divided screens, and the I-frame is stopped on other screens other than the one screen. It is preferable to display each image.

At this time, the real-time broadcast data and the still images are preferably re-simulated and outputted corresponding to the position and size of the screen divided by the number of multi-channels.

According to another aspect of the present invention, there is provided a method of providing digital broadcast data, the method including: displaying a channel list when a user requests to view digital broadcast; Displaying broadcast data of a corresponding channel selected by a user on a full screen; Dividing a screen corresponding to the number of channels included in the channel list when the channel list is displayed or when the entire channel view is requested while the broadcast data is being played; Displaying the broadcast data on any one of the plurality of divided screens; And simultaneously or sequentially displaying still images on screens other than the one screen.

In this case, the broadcast data or still images may be resized to correspond to a corresponding position and size of the split screen and then displayed on the corresponding screens, wherein the still images provide the broadcast data among a plurality of channels in the channel list. It is characterized in that the I-frame to detect from the broadcast data of other channels than the channel.

The digital broadcasting data providing method may further include: dividing the broadcasting data and the still images into a specific display area and outputting the divided data; Receiving user selection information for selecting one of the specific display areas; And performing an operation of any one of channel switching or enlarged display of the corresponding area based on the display area selection information of the user.

At this time, when the selection information for the broadcast data display region is input, the broadcast data display region is enlarged and displayed based on the pre-stored enlarged display information, and the display region selection information for one of the still image display regions is displayed. It is preferable to switch the corresponding channel when input.

In addition, the screen is divided according to the number of digital broadcast data to be received, broadcast data is displayed on one of the divided screens, and a still image of an I-frame is displayed on screens other than the one screen. It is preferable to display each.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. At this time, it should be noted that the same elements in the accompanying drawings are represented by the same reference numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Prior to the detailed description of the present invention, a digital broadcasting service to which the present invention is applied will be described below. In particular, the following describes a digital multimedia broadcasting (DMB) service to which the present invention is applied. However, the present invention is not limited to the DMB service. That is, in the embodiment of the present invention, a DMB service is described as an example for convenience of description, but the present invention is applied to all digital broadcasting such as digital video broadcasting (DVB) and media forward link only. Of course it is possible.

The DMB service is based on Digital Audio Broadcasting (DAB), a technology for digital radio, and the concept of multimedia broadcasting is added to send data information such as video, weather, news, and location. It includes. The DMB service is attracting attention as the next generation broadcast because it can provide high-quality and high-definition broadcasting of compact disk (CD, Compact Disk) or digital video disk (DVD, Digital Versatile Disk) level through a mobile terminal or a vehicle terminal on the go. .

That is, the DMB service refers to a broadcast service that allows a user to watch / listen to various channels while moving while using a mobile terminal or a vehicle terminal equipped with an omnidirectional receiving antenna.

The DMB service is a mobile broadcast service based on mobility compared to the existing broadcast as described above, and is classified into a satellite DMB and a terrestrial DMB according to a provision method. A comparison of the existing broadcast service and the DMB service may be performed as shown in Table 1 below.

As shown in Table 1, the DMB service is mobile compared to the existing broadcast service, and has a difference in that the receiving apparatus is downsized. In addition, the DMB service is classified into a terrestrial DMB and a satellite DMB as described above. This is largely divided according to whether a terrestrial transmission station provides a broadcast service or a satellite service.

When the satellite DMB transmits a program to a satellite in a satellite DMB broadcasting center using a satellite, the satellite transmits the program to a mobile terminal having a DMB function in all regions. As described above, the satellite DMB service is a new media broadcasting service that transmits broadcast waves through satellites and receives the broadcast waves transmitted to the mobile terminal. The satellite DMB service can be received anywhere in the country because it uses satellites, but in the basement, indoor and radio shade areas, a service called a gap filler (Gap Filler) receives a signal and retransmits the radio wave. .

The terrestrial DMB transmits a program using a frequency on the ground, and unlike the satellite DMB, a broadcast signal is transmitted through a base station (BS) on the ground. As described above, the terrestrial DMB service is a multimedia service that provides a combination of TV broadcasting, audio broadcasting, data broadcasting, and the like while using the ground wave. Unlike the satellite DMB, the terrestrial DMB uses a broadcast transmission system such as a base station of a mobile terminal.

1 is a diagram schematically illustrating an example of a configuration of a general DMB system.

Referring to FIG. 1, a DMB system includes a broadcasting center 100, one or more satellites 200, one or more base stations 300, and receiving devices such as a mobile, portable, and fixed form, for example, a vehicle receiver. 400, the portable terminal 500, the home receiver 600, and the like.

The broadcasting center 100 compresses and modulates DMB data such as audio, video, and text signals, and transmits the modulated data to the satellite 200 or the base station 300.

The satellite 200 or the base station 300 receives a signal transmitted from the broadcasting center 100, amplifies a predetermined signal, and then frequency-converts the broadcast signal to the receiving apparatuses 400 to 600.

The receiving apparatuses 400 to 600 receive and demodulate the signals broadcast from the satellite 200 or the base station 300, decompress them, and convert the original signals into original signals.

On the other hand, due to the rapid development of the DMB service technology, the user can watch a clean digital broadcast without noise while moving at high speed. Therefore, there is a need for additional functions and services that can provide more convenience to the user corresponding to the DMB service developed as described above.

Accordingly, in an exemplary embodiment of the present invention, broadcast data of a channel is continuously received while maintaining one reception channel, and at least one other channel receives broadcast data while changing a plurality of reception channels based on a preset channel change condition. Do it.

Hereinafter, one reception channel continuously received is referred to as a 'main channel', and a plurality of reception channels changed based on the change condition are referred to as 'subchannels'. In this case, the change condition may be any one of a user's change request, a preset change period, and I-frame data detection of a subchannel. The 'change condition' of the subchannel will be described in detail later with reference to the drawings.

2 is a schematic block diagram of a DMB receiving apparatus according to a first embodiment of the present invention.

Referring to FIG. 2, the DMB receiving apparatus 100 according to the first embodiment of the present invention may include a DMB module 110, a TS demultiplexer 120, a main channel buffer 130, a subchannel processor 140, and an A / V. A codec 150, an image synthesizer 160, a DMB output unit 170, a channel setting control unit 180, and an input unit 190 are included.

The DMB module 110 receives broadcast data corresponding to the broadcast channel selected by the user and outputs transport stream data for the broadcast channel. In particular, the DMB module 110 sets a Walsh code value corresponding to each of the main channel and the subchannel based on the received channel information transmitted from the channel setting control unit 180 and then uses the Walsh code to use the main channel. And filter only the TS data of the channel set as the subchannel. At this time, the DMB module 110 adds the corresponding channel information before outputting the filtered TS data and then performs deinterleaving. Meanwhile, the Walsh code is a code value used to filter only TS packet data of a specific channel from broadcast data delivered through MPEG-2 TS.

The TS demultiplexer 120 separates main / subchannel data from the TS data transferred from the DMB module 110 and detects and outputs MPEG-4 data. At this time, the data of the main channel is transferred to the main channel buffer 130, and the data of the subchannel is transferred to the subchannel processor 240.

The main channel buffer 130 stores broadcast data of the main channel transmitted through the TS demultiplexer 120. In particular, the main channel buffer 130 stores audio data and video data separately from the broadcast data. To this end, the main channel buffer 130 preferably includes an audio buffer 131 for storing audio data and a video buffer 133 for storing video data. At this time, the audio buffer 131 and the video buffer 133 store corresponding audio data and video data in digital form.

The subchannel processor 140 detects video data from the broadcast data of the subchannel transmitted through the TS demultiplexer 120 and then detects and stores data of the I-frame from the video data. To this end, the subchannel processor 140 may include an I-frame detector 141 for detecting an I-frame, and an I-frame information storage 143 for storing the detected I-frame together with corresponding subchannel information. It is preferable to include.

In this case, the 'I-frame' is an intra frame, and is included in the video data stream compressed by MPEG together with 'P-frame' and 'B-frame' or together with 'P-frame'. And reference image information required for video compression and decompression by MPEG. Thus, an I-frame is included in the MPEG video data stream every certain period (e.g., 0.5 seconds for satellite DMB). In addition, I-frame data is larger in size than P frame data and B frame data. For example, P-frame data is about 1/10 of I-frame data.

Accordingly, the I-frame detector 141 detects I-frame data from broadcast data of subchannels transmitted from the TS demultiplexer 120. That is, I-frame data is detected from the subchannel broadcast data at every I-frame transmission period of the subchannel broadcast data. If only one channel is set in the DMB module 110 for subchannel reception, the subchannel broadcast data transmitted to the subchannel processor 140 may include only video data. Therefore, I-frame detector 141 detects I-frames from the video data. However, when two channels are set in the DMB module 110 for subchannel reception, the subchannel broadcast data transmitted to the subchannel processor 140 may include both video data and audio data. Therefore, it is preferable that the I-frame detector 141 further performs a process of detecting video data from the broadcast data. That is, the I-frame detector 141 preferably detects the video data from the broadcast data and then detects the I-frame data from the video data.

In addition, the I-frame detector 141 stores I-frame transmission period information in advance in order to detect I-frame data from a stream of video data, and detects or receives received data as I-frame data for each period. It is desirable to compare the data size of the data stream and to detect data having a relatively large size as I-frame data.

The I-frame information storage unit 143 stores the I-frame data detected by the I-frame detector 141 and the subchannel information corresponding to the detected I-frame. That is, the I-frame data for the corresponding channel is updated and stored for each I-frame transmission period.

The sub-channels of the sub-channels (especially, when the image synthesizer 160 wants to display each image corresponding to the I-frame for a plurality of sub-channels changed with a predetermined channel change period on one screen) This is to refer to the I-frame image for the previous subchannel). To this end, the I-frame information storage unit 143 preferably stores subchannel information equal to or greater than the preset number of subchannels, that is, the number of subchannels displayed simultaneously with the main channel image. An example of storing such I-frame information is illustrated in FIG. 4. Referring to FIG. 4, the I-frame information management table 40 includes a channel identifier 41 field and an I-frame information 43 field and stores I-frame information corresponding to each channel.

The A / V codec 150 decodes and outputs digital audio data and video data from the main channel buffer 230. That is, the A / V codec 150 outputs an audio signal and a video signal.

The image synthesizer 160 outputs the main channel image decoded by the A / V codec 160 and the subchannel processor 140 through the main channel buffer 130 to simultaneously output the multi-channel image on one screen. Compose multiple subchannel images. In particular, the channel-specific I-frame data stored in the main channel image and the I-frame information storage unit 143 are synthesized. At this time, the image synthesizing unit 160 stores the number of preset subchannels as the number of subchannels to be output together with the main channel image, and the number corresponding to the number of subchannels from the I-frame information storage unit 143. It is preferable to sequentially select I-frame data and to synthesize the main channel image.

The DMB output unit 170 includes a speaker 171 for outputting an audio signal output from the A / V codec 150, and a display unit 173 for outputting an image signal output from the image synthesizer 160. In particular, the display unit 173 preferably outputs the video signals of the main channel and the subchannel data simultaneously on one screen by using the output signal of the image synthesizing unit 160.

The channel setting controller 180 sets channel information to be received and transmits the received channel information to the DMB module 110. In particular, the channel setting controller 180 sets the main channel information and the subchannel information and transmits them to the DMB module 110. To this end, the channel setting controller 180 uses the user's selection information input through the input unit 190. At this time, the channel setting controller 180 stores a channel list of a plurality of preferred channel information automatically generated based on a plurality of subchannel information selected by a user or previous viewing information, and based on a preset channel change condition. It is preferable to sequentially select the channels included in the channel list and deliver them to the DMB module 110. In particular, the channel list preferably includes channel information of a predetermined number or more as the number of subchannels to be simultaneously output on one screen.

The channel change condition may be any one of a user change request, a preset channel change period, and I-frame data detection of the current subchannel. If the channel change condition is a user change request, the channel setting controller 180 may set a reception channel based on channel information input together with the channel change request.

When the channel change condition is a user change request or a preset channel change period, the DMB module 110 maintains a previously set subchannel as a reception channel until the channel change condition is satisfied, and the subchannel processor 140 The image of the corresponding subchannel is updated at every I-frame transmission period of the subchannel. That is, the I-frame information stored in the I-frame information storage unit 143 is updated.

Accordingly, the DMB output unit 170 outputs the broadcast data of the main channel transferred through the main channel buffer 130 and is set in advance based on the I-frame information for each subchannel stored in the I-frame information storage unit 143. Displays a number of subchannel images, but updates and displays the current subchannel image at an I-frame transmission period of the current subchannel until the channel information set as the current subchannel is changed.

In particular, in order to change the subchannel by detecting the data of the I-frame, the channel setting controller 180 preferably receives from the I-frame detector 141 that an I-frame for a specific subchannel has been detected. In this case, since the I-frame includes reference image information for MPEG compression and reconstruction as described above, it is possible to generate an image of a corresponding subchannel using only the information of the I-frame. Accordingly, when the subchannel is changed by data detection of the I-frame, when the I-frame of the specific subchannel is detected, the image of the subchannel is updated with the I-frame image and then the image of the next subchannel is received.

Therefore, the present invention can provide recent image information on a plurality of subchannels while outputting the broadcast of the main channel.

Meanwhile, the channel setting control unit 180 selects or changes the subchannel information based on the selection information whenever the user's selection information is input without storing the channel list for changing the subchannel as described above. It is also possible to deliver to the DMB module 110.

In addition, when the main channel change information is input through the input unit 190, the channel setting controller 180 changes the main channel information based on the information. That is, the channel setting control unit 180 sets the main channel information and the subchannel information to be received by the DMB module 110, but controls the DMB module 110 to change a plurality of subchannel information while the main channel information is fixed. do.

3 is a schematic block diagram of a DMB broadcast receiving apparatus according to a second embodiment of the present invention.

Referring to FIG. 3, the DMB receiving apparatus 200 according to the second embodiment of the present invention may include a DMB module 210, a TS demultiplexer 220, a main channel buffer 230, a subchannel processor 240, and an A / V. A codec 250, an image synthesizer 260, a DMB output unit 270, a channel setting control unit 280, and an input unit 290 are included. In particular, FIG. 3 illustrates an example of receiving two subchannel information at once when there are more channels in the DMB receiving apparatus illustrated in FIG. 2.

Thus, each of the devices is similar in function to the devices illustrated in FIG. 2.

That is, the DMB module 210 is the DMB module 110 of FIG. 2, the TS demultiplexer 220 is the TS demultiplexer 120 of FIG. 2, and the main channel buffer 230 is the main channel buffer 130 of FIG. 2. The subchannel processor 240 is the subchannel processor 140 of FIG. 2, the A / V codec 250 is the A / V codec 150 of FIG. 2, and the image synthesizer 260 is the image of FIG. 2. The synthesizer 160, the DMB output unit 270, the DMB output unit 170 of FIG. 2, the channel setting control unit 280, the channel setting control unit 180 of FIG. 2, and the input unit 290 of FIG. 2. The input unit 190 and its function is similar.

However, the apparatuses related to the subchannel processing have different subchannel processing due to the increase in the received subchannel.

For example, when the channel setting control unit 280 transmits the channel setting information to the DMB module 210, one channel information and two subchannel information are set and delivered at the same time, and the DMB module 210 transmits the channel setting information. After setting Walsh code values corresponding to each of the three channels, the TS data corresponding to the main channel and the two subchannels are filtered and output using the Walsh code. Then, the TS demultiplexer 220 separates data for the primary channel and the first and second subchannels from the TS data transferred from the DMB module 210, and then detects and outputs the MPEG-4 data.

Meanwhile, the subchannel processor 240 includes an I-frame detector for each channel because the broadcast data received through the plurality of subchannels is processed at one time. That is, I-frame detector 1 241 for detecting I-frame data for the first subchannel, I-frame detector 2 242 for detecting I-frame data for the second subchannel, and I And an I-frame information storage unit 243 for storing channel-specific I-frame data transferred from the frame detector 1 241 and the I-frame detector 2 242.

As described above, in FIG. 3, the functions of the DMB module 210, the TS demultiplexer 220, the subchannel processor 240, and the channel setting controller 280 are changed due to the increase of the subchannels simultaneously received. Meanwhile, devices other than the above devices operate similarly to those illustrated in FIG. 2. Therefore, a detailed description of each device other than the above devices will be omitted.

3 illustrates an example in which the number of subchannels that can be simultaneously received is increased by one in the DMB receiving apparatus of FIG. 2. However, the present invention is not limited to one or two subchannels that can be simultaneously received. That is, the present invention relates to simultaneously displaying a main channel and a plurality of subchannel image information, and providing recent image information for each of the subchannels sequentially selected based on the above-described channel change condition. It does not limit the number of subchannels received. The number of subchannels may increase as the performance of the DMB module is improved.

FIG. 5 is a diagram illustrating an example of a method of simultaneously outputting a multi-channel image using a DMB receiving apparatus according to the first and second exemplary embodiments of the present invention. Hereinafter, the DMB receiving apparatuses according to the first and second embodiments will be abbreviated as DMB receiving apparatuses.

Referring to FIG. 5, first, the DMB receiving apparatus sets channel information for receiving a plurality of channels (S105). For example, the DMB receiving apparatus sets main channel information and subchannel information. In this case, the DMB receiving apparatus stores a channel list generated by using a plurality of subchannel information selected by a user or a plurality of favorite channel information automatically generated based on previous viewing information, and based on a preset channel change condition. It is preferable to sequentially select channels included in the list and to set subchannel information. At this time, the channel change condition is as mentioned in the description with reference to FIG. 2.

When the DMB viewing is started (S110), the DMB receiving apparatus receives broadcast data for a plurality of channels set in step S105 (S115), and then separates main channel data and subchannel data among the received broadcast data. It is detected (S120). This is because the main channel data and the subchannel data are interleaved in the receiving process S115 and delivered in a mixed state. In this case, a detailed process for the separation detection is similar to that mentioned in the functional description of the TS demultiplexer 120 with reference to FIG. 2.

In operation S120, the DMB receiving apparatus that detects main channel data and subchannel data separately stores the main channel data (S125). After the I-frame data is detected from the subchannel data (S130), the detected I-frame data is stored for each subchannel (S135). In this case, the processes S130 and S135 for the processing of the subchannels are similar to those mentioned in the functional description of the subchannel processing unit 140 with reference to FIG. 2.

After separating the main / subchannel data as described above, the DMB receiving apparatus which detects the I-frame data from the subchannel data synthesizes the number of I-frame data corresponding to the preset number of subchannels and the main channel image (S140). ) The synthesized image and the audio data through the main channel are output (S145).

If the subchannel change condition is satisfied in the state in which the DMB viewing is maintained (S150), that is, the main channel viewing is maintained (S155), the DMB broadcast receiving apparatus changes the subchannel information (S160) and then the process ( S115) and then repeat.

In this case, the change condition is preferably any one of a user change request, a preset channel change period, and I-frame data detection of a subchannel. The 'change condition' of the subchannel and the process of changing the subchannel information (S160) are the same as those described in the function description of the channel setting controller 180 of FIG. 2.

By performing the above process, the DMB receiving apparatuses according to the first and second embodiments of the present invention simultaneously display the latest image information of the multi-channel. In particular, the user can easily select a channel by displaying a recent image of a plurality of subchannels while watching one main channel.

6 is a schematic block diagram of a DMB receiving apparatus according to a third embodiment of the present invention.

Referring to FIG. 6, the DMB receiving apparatus 300 according to the third embodiment of the present invention may include a DMB module 310, a TS demultiplexer 320, a main channel buffer 330, a subchannel processor 340, and an A / V. A codec 350, an image synthesizer 360, a DMB output unit 370, a channel setting control unit 380, an input unit 390, and a first switch SW1 are included. In particular, FIG. 6 illustrates an example of a DMB receiving apparatus that switches between a main channel and a subchannel based on a request for switching between a main channel and a subchannel in the DMB receiving apparatus illustrated in FIG. 2. To this end, the DMB receiving apparatus illustrated in FIG. 6 further includes a first switch SW1 for changing a main channel data transmission path and a subchannel data transmission path.

Thus, each of the devices is similar in function to the devices illustrated in FIG. 2.

That is, the DMB module 310 is the DMB module 110 of FIG. 2, the TS demultiplexer 320 is the TS demultiplexer 120 of FIG. 2, and the main channel buffer 330 is the main channel buffer 130 of FIG. 2. The subchannel processor 340 is the subchannel processor 140 of FIG. 2, the A / V codec 350 is the A / V codec 150 of FIG. 2, and the image synthesizer 360 is the image of FIG. 2. The synthesizer 160, the DMB output unit 370 are the DMB output unit 170 of FIG. 2, the channel setting control unit 380 is the channel setting control unit 180 of FIG. 2, and the input unit 390 is the FIG. 2. The input unit 190 and its function is similar.

However, in the case of the channel setting controller 380, a function of outputting a control signal for changing the transmission path between the main channel and the subchannel to the first switch SW1 is added. Therefore, a detailed description of each device except for the channel setting controller 380 is omitted.

Meanwhile, the channel setting control unit 380 may generate a first control signal for changing a transmission path of the first switch SW1 based on the user selection information input through the input unit 390 or pre-stored main / sub channel switching conditions. Output to switch SW1. At this time, the pre-stored main / subchannel switching condition is preferably a main / subchannel switching period or a main / subchannel switching time. If the main / sub channel switching condition is a main / sub channel switching period, the channel setting controller 380 repeatedly outputs a control signal for switching the main channel and the sub channel at specific time intervals, and the main / sub channel switching. When the condition is the main / sub channel switching time, the channel setting controller 380 outputs a control signal for switching the main channel and the sub channel at a specific time.

The first switch SW1 then changes the current transmission path in response to the control signal. For example, the first switch SW1 in an initial state connects the first point SWp1 and the third point SWp3, connects the second point SWp2 and the fourth point SWp4, and then the first point. The main channel data transmission path is formed using the connection path between SWp1 and the third point SWp3, and the subchannel data transmission path is formed using the connection path between the second point SWp2 and the fourth point SWp4. If so, the first switch SW1 changes the path in response to the control signal. That is, in response to the control signal, the first switch SW1 connects the first point SWp1 and the fourth point SWp4 and connects the second point SWp2 and the third point SWp3. The main channel data transmission path is formed using the connection path between the first point SWp1 and the fourth point SWp4, and the subchannel using the connection path between the second point SWp2 and the third point SWp3. Form a data transfer path.

Therefore, the main channel broadcast data initially transmitted to the third point SWp3 through the first point SWp1 is transferred to the subchannel processor 340 through the fourth point SWp4 and processed as subchannel data. The main channel broadcast data transferred to the fourth point SWp4 through the second point SWp2 is transferred to the main channel buffer 330 through the third point SWp3 and processed as main channel data.

As described above, in the DMB broadcast receiving apparatus illustrated in FIG. 6, the transmission paths of the main channel data and the subchannel data may be changed based on the control signal of the channel setting controller 380.

7 is a schematic block diagram of a DMB receiving apparatus according to a fourth embodiment of the present invention.

Referring to FIG. 7, the DMB receiver 400 according to the fourth embodiment of the present invention may include a DMB module 410, a TS demultiplexer 420, a main channel buffer 430, a subchannel processor 440, and an A / V. A codec 450, an image synthesizer 460, a DMB output unit 470, a channel setting control unit 480, an input unit 490, and second to fourth switches SW2, SW3, and SW4 are included. In particular, in the DMB receiving apparatus illustrated in FIG. 2, the main channel and the subchannel are switched based on the request for switching between the main channel and the subchannel. An example of a DMB receiving apparatus for storing the same is shown. To this end, the DMB receiver 400 illustrated in FIG. 7 further includes a subchannel buffer 445 in the subchannel processor 440 and includes second to fourth switches SW2, SW3, for changing a transmission path. SW4) is further included.

Therefore, each of the other devices except for the devices related to the path change and the subchannel data storage (the subchannel processor 440, the channel setting controller 480, and the second to fourth switches SW2, SW3, and SW4) The functions are similar to those of the apparatus illustrated in FIG.

That is, the DMB module 410 is the DMB module 110 of FIG. 2, the TS demultiplexer 420 is the TS demultiplexer 120 of FIG. 2, and the main channel buffer 430 is the main channel buffer 130 of FIG. 2. , The A / V codec 450 is the A / V codec 150 of FIG. 2, the image synthesizer 460 is the image synthesizer 160 of FIG. 2, and the DMB output unit 470 is the DMB of FIG. 2. The output unit 170, the channel setting control unit 480 has a similar function to the channel setting control unit 180 of FIG. 2, and the input unit 490 has the same function as the input unit 190 of FIG.

Meanwhile, a function of outputting a control signal for changing the transmission path between the main channel and the subchannel to the second to fourth switches SW2, SW3, and SW4 is added to the channel setting controller 480. That is, the channel setting control unit 480 includes a function of the channel setting control unit 180 illustrated in FIG. 2 and the control signal outputting function.

Accordingly, the channel setting controller 480 may switch the second switch SW2, the third switch SW3, and the fourth switch based on the user's selection information input through the input unit 490 or pre-stored main / sub channel switching conditions. The control signal CH.sig for changing the transmission path of SW4 is output to the second switch SW2, the third switch SW3, and the fourth switch SW4.

Then, the second to fourth switches SW2, SW3, and SW4 change the transmission path in response to the control signal CH.sig. In the example of FIG. 7, the transmission path indicated by the solid line is the initial transmission path, and the transmission path indicated by the dotted line is the transmission path to be changed based on the main / subchannel switching request.

7 illustrates an example in which transmission paths of an input terminal of the I-frame detector 441 and an output terminal of the main channel buffer 430 and the subchannel buffer 445 are switched based on the main / subchannel switching request. have.

That is, the second switch SW2 connected to the input terminal of the I-frame detector 441 initially connects the input terminal of the I-frame detector 441 and the input terminal of the subchannel buffer 445. When the control signal in response to the main / sub channel switching request is output through the channel setting controller 480, the connection between the input terminal of the I-frame detector 441 and the input terminal of the subchannel buffer 445 is released and the I-frame is disconnected. The input terminal of the detector 441 is connected to the input terminal of the main channel buffer 445. That is, the broadcast data transmitted to the main channel buffer 430 before the main / sub channel switch request is input to the I-frame detector 441 to detect the I-frame from the broadcast data input to the main channel buffer 430. .

Meanwhile, the transmission paths of the third and fourth switches SW3 and SW4 connected to the output terminals of the audio and video of the main channel buffer 430 are changed to the transmission path from the subchannel buffer 445. That is, the transmission path of the third switch SW3, which initially transmits the data output from the audio buffer 431 of the main channel buffer 430 to the speaker 471, is transferred from the audio buffer 447 of the subchannel buffer 445. The output data is changed to be delivered to the speaker 471. In addition, the video buffer 449 of the subchannel buffer 445 transmits the transmission path of the fourth switch SW4 that has transferred data output from the video buffer 433 of the main channel buffer 430 to the A / V codec 450. Change the data output from the A / V codec 450 to be transferred.

As described above, the DMB broadcast receiving apparatus illustrated in FIG. 7 also buffers broadcast data received through the subchannel and switches the output terminal of the buffered data and the input terminal of the I-frame detector based on a request for switching between main and subchannels. This allows switching between primary and secondary channels with minimal time delay due to channel switching.

8 is a diagram illustrating an example of a method of simultaneously outputting a multi-channel image by using the DMB receiving apparatuses according to the third and fourth exemplary embodiments of the present invention. In particular, FIG. 8 is a flowchart illustrating a method of switching a main channel and a subchannel while simultaneously outputting a multi-channel image. Hereinafter, the DMB receiving apparatuses according to the third and fourth embodiments will be abbreviated as DMB receiving apparatuses.

Referring to FIG. 8, first, the DMB receiving apparatus sets channel information for receiving a plurality of channels (S205). For example, the DMB receiving apparatus sets main channel information and subchannel information. In this case, the DMB receiving apparatus stores a channel list generated using a plurality of subchannel information selected by a user or a plurality of favorite channel information automatically generated based on previous viewing information, and stores the channel list based on a preset change condition. It is preferable to sequentially set the channels included in the subchannel information. At this time, the change condition is as mentioned in the description with reference to FIG. 2.

When the user starts watching DMB (S210), the DMB receiving apparatus receives broadcast data for a plurality of channels set in step S205 (S215), and then separates main channel data and subchannel data among the received broadcast data. It is detected (S220). This is because the main channel data and the subchannel data are interleaved in the receiving process S215 and are delivered in a mixed state. In this case, a detailed process for the separation detection is similar to that mentioned in the functional description of the TS demultiplexer 120 with reference to FIG. 2.

In operation S220, the DMB receiving apparatus that detects main channel data and subchannel data separately stores the main channel data and the subchannel data (S225). That is, the main channel data and the subchannel data are respectively stored in the main channel buffer for storing the main channel data and the subchannel buffer for storing the subchannel data.

After the I-frame data is detected from the subchannel data (S230), the detected I-frame data is stored for each subchannel (S235). In this case, the processes S230 and S235 for the subchannel processing are similar to those mentioned in the functional description of the subchannel processing unit 140 with reference to FIG. 2.

After separating the main / subchannel data as described above, the DMB receiving apparatus which detects the I-frame data from the subchannel data synthesizes the number of I-frame data corresponding to the preset number of subchannels and the main channel image (S240). ) The synthesized image and the audio data through the main channel are output (S245).

If the main channel and the subchannel switching request are input in the state in which the DMB viewing is maintained (S250), that is, the main channel viewing is maintained (S255) or if the preset main channel and the subchannel switching conditions are satisfied, the main / sub The path of the channel is changed (S260). That is, in the case of the DMB receiving apparatus illustrated in FIG. 6, the transmission path of the first switch SW1 is changed, and in the case of the DMB receiving apparatus illustrated in FIG. 7, the transmission path of the second to fourth switches SW2 to SW4 is changed. do. Each of these transmission path change procedures is as mentioned in the description with reference to FIGS. 6 and 7.

In addition, if the subchannel change condition is satisfied in the state where the DMB viewing is maintained (S250), that is, the main channel viewing is maintained (S265), the DMB broadcast receiving apparatus changes the subchannel information (S270) and then the process ( S215) and then repeat.

In this case, the change condition is preferably any one of a user change request, a preset channel change period, and I-frame data detection of a subchannel. The 'change condition' of the subchannel and the process of changing the subchannel information (S270) are as described in the function description of the channel setting controller 180 of FIG. 2.

By performing the above process, the DMB receiving apparatuses according to the third and fourth embodiments of the present invention can not only display the latest image information of the multi-channel at the same time, but also respond to the main / sub-channel switching request. You can switch between the selected subchannel and main channel. In particular, the DMB receiving apparatus according to the fourth embodiment can minimize the time delay caused by the channel switching.

9 is a configuration example of MPEG image data processed by a DMB receiving apparatus according to the first to fourth embodiments of the present invention.

Referring to FIG. 9, FIG. 10 is a diagram illustrating examples of video streams for typical MPEG image data, in which (a) is a main block received by the DMB receiving apparatus according to the first to fourth embodiments of the present invention. An example of a video stream of channel broadcast data, (b) is an example of a video stream of the first subchannel broadcast data received at the DMB receiving apparatus, (c) is a second subchannel broadcast received at the DMB receiving apparatus An example of a video stream of data, (d) is an example of a video stream of the third subchannel broadcast data received at the DMB receiving apparatus, (e) is an example of a fourth subchannel broadcast data received at the DMB receiving apparatus. (F) is an example of the video stream of the fifth subchannel broadcast data received at the DMB receiving apparatus, and (g) is a video stream of the sixth subchannel broadcast data received at the DMB receiving apparatus. (H) is an example of the video stream of the seventh subchannel broadcast data received at the DMB receiving apparatus, and (i) is an example of the video stream of the eighth subchannel broadcast data received at the DMB receiving apparatus. Yes.

As such, the DMB receiving apparatus of the present invention receives a video stream from a plurality of channels. Particularly, in case of the subchannel, the channel data of (b) to (i) are sequentially selected and received, and the I-frame data is detected only when 'I-frame data' storing the basic image information is received. Save it. When the subchannel change condition of the DMB receiving apparatus of the present invention is 'I-frame detection', in the video stream structure as shown in FIG. The subchannel is changed to subchannel 2 at the time t1 at which the 'I-frame' of the channel 1 is detected, and the subchannel at the time t2 at which the 'I-frame' of the 'subchannel 2' is detected. Is changed to 'subchannel 3', the subchannel is changed to 'subchannel 4' at the time t3 at which the 'I-frame' of 'subchannel 3' is detected, and the 'I-' of 'subchannel 4' is changed. The subchannel is changed to the subchannel 5 at the time t4 at which the frame is detected, and the subchannel is changed to the subchannel 5 at the time t5 at which the I-frame of the subchannel 5 is detected. Change the subchannel to subchannel 6 at the time point t6 at which the 'I-frame' of the 'subchannel 6' is detected, and at the time at which the 'I-frame' of the 'subchannel 7' is detected ( t7) change the subchannel to 'subchannel 8' and the 'I-frame of' subchannel 8 ' At a time t8 at which 'is detected, the subchannel is changed back to' subchannel 1 '. And repeat the above process.

Then, whenever the subchannels 1 to 8 are selected while the broadcast data of the main channel is output, the 'I frame' of each channel will be updated. Accordingly, the present invention can output recent image information of subchannels.

10A and 10B are diagrams illustrating an example of a screen for multi-outputting images of multiple channels in the DMB receiving apparatuses according to the first to fourth embodiments of the present invention. In particular, FIG. 10A illustrates an example of displaying one main channel and eight subchannels, and FIG. 10B illustrates an example of displaying one main channel and four subchannels.

The DMB receiving apparatus of the present invention outputs broadcast data received through a plurality of channels with the screen configuration as illustrated in FIGS. 10A and 10B, but the broadcast data of the subchannels as described with reference to FIGS. 2 to 8. The latest image information of the subchannel can be provided by updating the information based on the respective I-frame information. In addition, based on the user's request, it is possible to freely switch between the primary channel and the selected sub-channel at the time of the request. For example, when the user selects one screen area of the subchannels, it is possible to switch between the subchannels and the main channel. On the other hand, when the user selects the screen area of the main channel, it is preferable to enlarge the main channel screen area. To this end, the DMB receiving apparatus preferably stores information for enlarged display (for example, enlargement ratio, display position information, etc.) in advance and enlarges the main channel screen region based on the information.

In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention attached to the claims. .

For example, in the above example, the present invention describes a case where one main channel and one or two subchannels are simultaneously received. However, the present invention does not limit the number of subchannels. That is, the present invention can be extended to the case of simultaneously receiving one main channel and two or more subchannels. In the above example, the present invention has been described by taking an example of a DMB receiving apparatus. However, the present invention is not limited to the DMB receiving apparatus only. That is, the present invention is applicable to all digital broadcast (eg, DMB, DVB-H, media flow, etc.) receiving apparatus.

Next, the screen is automatically divided into thumbnails in the form of thumbnails for the number of broadcast channels received by the DMB receiving apparatus, and an arbitrary channel is automatically displayed based on broadcast data information or preset information previously watched by a user. An embodiment of displaying broadcast data as a channel and displaying corresponding video information by using the remaining receiving channels as subchannels will be described.

For example, when two broadcast channels are received through the DMB receiving device, the screen is divided into two thumbnails so that one screen outputs the broadcast data of the main channel while the other screen displays the latest video data of the sub-channel. Is displayed. When four broadcast channels are received, the screen is divided into four thumbnails to display broadcast data of the main channel on one screen while displaying the latest image data corresponding to each subchannel on the other screens. .

In this case, the broadcast data may include video data and audio data. The latest image data includes a still image corresponding to an I-frame detected from each subchannel broadcast data. The latest image data may include an image that receives broadcast data for a preset time and captures raw data decoded last when the broadcast data is received. Hereinafter, for convenience of description, the recent image data will be described as a case of image data by I-frame, but the present invention is not limited thereto. Such broadcast data and recent image data are preferably resized to correspond to the position and size of the split screen, and are generated and displayed in a thumbnail form.

11 is a diagram illustrating an example of a method of simultaneously outputting broadcast data of multiple channels using a DMB receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 11, when the DMB receiver starts to watch DMB (S305), it determines a broadcast channel that can be received (S310) and divides the screen by the number of the broadcast channels that can be received (S315). In addition, the DMB receiving apparatus simultaneously receives each broadcast data through the receivable broadcast channels determined in step S310 (S320), and displays the size of each screen for dividing the display size of the received broadcast data in step S315. Resizing to (S325).

After resizing the received broadcast data in step S325, the DMB receiving apparatus checks whether there is previously watched broadcast channel information (S330). If the previous viewing broadcast channel information exists, the broadcast data of the previous viewing broadcast channel is allocated to the primary channel (S335), and I-frames are detected from the broadcast data of the remaining broadcast channels and allocated to the subchannel (S340). At this time, if there is no previous broadcast channel information, it is preferable to allocate broadcast data of a preset broadcast channel to a primary channel, and to detect an I-frame from the broadcast data of the remaining broadcast channels and assign it to a subchannel.

As such, the DMB receiving apparatus that detects I-frame data from the subchannel broadcast data after separating the main / subchannel data is performed in step S310 with the main channel image and the subchannel on each screen separated by the number of broadcast channels. After synthesizing the number of I-frame data corresponding to the number (S345). That is, broadcast data including video and audio data is reproduced as a stream on the main channel, and the latest image data corresponding to the detected I-frames is output on the subchannel (S345).

The DMB receiving apparatus repeats the process (S310) after the re-search of the broadcast channel is requested from the user (S350). In addition, when the DMB receiving apparatus is requested to switch the main channel from the user (S355), the DMB receiving apparatus changes the path of the main channel and the corresponding subchannel selected from the user (S360), and repeats the process (S345) and later. That is, when changing the path between the main and sub-channels, the DMB receiving apparatus detects an I-frame in the broadcast data of the corresponding broadcast channel on the screen of the previous main channel, outputs the latest image data, and changes to the main sub-channel. Plays the broadcast data of the corresponding broadcast channel on the screen. The DMB receiving apparatus ends the above-described processing when the user requests to stop watching the DMB (S365).

By performing the above-described processing, the DMB receiving apparatus of the present invention reproduces broadcast data including video and audio signals through multi-channel recent image information, that is, a main channel screen and each sub-channel through a plurality of sub-channel screens. The latest image data of the I-frame detected in the broadcast data of the channel is simultaneously displayed. In particular, by viewing recent image data of a plurality of subchannels while watching one main channel, there is an advantage of making the user's channel selection / movement faster and more convenient.

12 illustrates another example of a method of simultaneously outputting broadcast data of multiple channels using a DMB receiving apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 12, first, when the DMB receiver starts to watch DMB (S405), a broadcast channel is searched (S410), and a channel list for the searched broadcast channel is displayed (S415). At this time, the search process of the broadcast channel can be omitted. That is, the channel list that is initially displayed may be displayed based on the user's previous DMB viewing information. The DMB receiving apparatus reproduces the broadcast data of the corresponding broadcast channel selected by the user from the channel list displayed in step S415 through the entire screen (S420).

In step S420, when the DMB receiving device displaying the broadcast data of the selected broadcast channel on the full screen is requested, the <Channel Full View> function is requested based on a user's key input (S425). The screen is divided by the number of channels (or the number of broadcast channels displayed in the channel list) (S430). In addition, the DMB receiving apparatus receives broadcast data for all searched broadcast channels (S435) and broadcasts the received broadcast data corresponding to the position of a screen divided by the number of broadcast channels in step S430. The display size of the data is resized (S440).

After resizing the corresponding broadcast data in step S440, the DMB receiving apparatus reproduces the broadcast data of the broadcast channel selected in step S420 through an arbitrary divided screen allocated to the main channel (S445). In addition, the DMB receiving apparatus sequentially detects an I-frame from the broadcast data of the remaining broadcast channels except for the broadcast channel selected in step S420 among the searched broadcast channels (or broadcast channels of the channel list) and assigns them to subchannels. The latest image data are respectively output through the divided screens (S450).

As described above, in the state in which the main / sub channel broadcast data is separated and the stream playback and the latest video data are simultaneously displayed, the DMB receiving apparatus may perform a corresponding operation according to a user request (S455). This operation will be described with reference to FIGS. 13 to 14.

FIG. 13 is a diagram illustrating an example of an operation method by an event occurring during multichannel broadcast data display using a DMB receiving apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 13, if a split screen allocated to the main channel is selected from the user during playback of a broadcast data stream by the main channel screen and output of the latest image data by the sub-channel screens, the process of FIG. 12 is performed (S505). The DMB receiving apparatus reproduces the broadcast data by partially expanding the split screen to a preset position and size (S510). At this time, as the split screen is enlarged, it is preferable to resize the display size of the broadcast data of the corresponding broadcast channel to automatically change and output the corresponding split screen size.

In the process (S510), when the broadcast data is reproduced on the partially enlarged screen (S510), when the user requests a full screen playback (for example, selecting the enlarged screen) from the user (S515), the DMB receiving apparatus displays the broadcast data. Play through the full screen (S520). At this time, as the split screen is enlarged, it is preferable to resize the display size of the broadcast data of the corresponding broadcast channel to automatically change the output size to correspond to the size of the entire screen.

An example of the user interface according to the operation of FIG. 13 will be described later with reference to FIGS. 15 to 18, and thus a detailed description thereof will be omitted.

14 is a diagram illustrating an example of an operation method by an event occurring during multichannel broadcast data display using a DMB receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 14, first, when a channel switching is requested for a main channel from a user during broadcast data stream reproduction by a main channel screen and output of recent image data by subchannel screens (S605). The DMB receiving apparatus changes the path of the main / sub channel (S610). In operation S610, the DMB receiving apparatus which changes the main / sub channel path detects an I-frame from broadcast data (eg, video data) of the previous main channel and displays the corresponding broadcast channel on the screen of the previous main channel. The latest image data is output (S615).

In addition, the DMB receiving apparatus receives the broadcast data of the broadcast channel requested to be switched and reproduces the received broadcast data on the screen of the previous subchannel which has been rerouted (S620). In this case, the method may further include resizing broadcast data to be reproduced on the screen of the main / sub-channel and the latest image data according to the screen size of the sub-channel.

An example of the user interface according to the operation of FIG. 14 will be described later with reference to FIGS. 15 to 18, and thus a detailed description thereof will be omitted.

15 is a diagram schematically illustrating an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention. In particular, FIG. 15 illustrates an example of outputting recent image data to divided screens allocated as subchannels.

Referring to FIG. 15, when the user starts watching DMB, the DMB receiving apparatus of the present invention receives broadcast channel information transmitted from the broadcasting center 100 of FIG. 1 and configures it into a channel list, as illustrated in 510. Display the same initial screen. In this case, terrestrial DMB can be configured as a channel list by using information of broadcasting channels retrieved from the DMB receiver, and in case of satellite DMB, electronic program guide (EPG) information is used. The channel list may be configured as a channel list, and the channel list may be composed of broadcast channels that the user prefers based on a user setting method.

Next, in the channel list display state 510, the DMB receiving apparatus provides a split screen for outputting multi-channel broadcast data as indicated by reference numeral 520 to 540 based on a user request. In particular, in FIG. 15, a case in which the channel list includes nine broadcast channels will be described as an example. Therefore, the number of split screens is preferably automatically divided by the number of broadcast channels (eg, nine) based on the channel list. In addition, the divided screen includes one main channel screen indicating stream broadcast data including video and audio signals as indicated by reference numerals 510 to 540, and a recent I-frame detected from broadcast data of each broadcast channel. It consists of one or more subchannel screens displaying image data.

At this time, in the embodiment of the present invention, although the latest image data by I-frame detection is displayed on the subchannel screen, stream broadcast data may be displayed on the subchannel screen. In this case, it is preferable that the stream broadcast data displayed on the subchannel screen includes only a video signal in order to prevent collision with the audio signal of the main channel.

The broadcast channel data including the video and audio signals are reproduced by assigning an arbitrary broadcast channel selected by the user to the main channel screen at 510 and the remaining broadcasts not selected by the user at 510. Channels are allocated as sub-channel pictures to output recent image data by I-frames detected in each broadcasting channel.

At this time, in displaying the latest image data corresponding to the I-frame on a plurality of subchannel screens, the latest image data of each broadcasting channel is buffered and output at once or displayed in a channel list as shown in FIG. 15. The channel numbers may be sequentially output, for example, in order of thumbnail scanning.

For example, as shown by reference numeral 520, first, broadcast data of a corresponding broadcast channel (e.g., channel 1 (Ch1)) is reproduced as a stream on a screen allocated as a main channel, and an arbitrary screen (e.g., assigned as a subchannel) is displayed. The latest video data of the I-frame detected from the broadcast data of the corresponding broadcast channel (eg, channel 2 (Ch2)) is output to the first subchannel screen. The DMB receiving apparatus outputting the latest image data corresponding to the first subchannel screen may have a screen allocated to the next subchannel at a predetermined time (N sec), for example, 3 frame periods, as indicated by reference numeral 530. The latest video data of the I-frame detected from the broadcast data of the corresponding broadcast channel (eg, channel 3 (Ch3)) is output to the second subchannel screen. Through this process, the DMB receiving apparatus outputs latest image data of all remaining subchannels as indicated by reference numeral 540.

As such, the DMB receiving apparatus that detects I-frame data from the subchannel data after separating the main / subchannel data is synthesized after synthesizing the main channel image and the number of I-frame data corresponding to the preset number of subchannels. Outputs video and audio data through the main channel.

16 is a diagram schematically illustrating an operation structure for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 16, the DMB receiving apparatus of the present invention includes a DMB module 610, a TS demultiplexer 620, a video codec 630, an audio codec 640, a scaler ( 650, a speaker 660, and a display unit 690.

Each of the devices is similar in function to the devices illustrated in FIG.

That is, the DMB module 610 is the DMB module 110 of FIG. 2, the TS demultiplexer 620 is the TS demultiplexer 120 of FIG. 2, the video codec 630 and the audio codec 640 of FIG. The V codec 150, the speaker 660, and the display unit 690 have similar functions to the DMB output unit 270 of FIG. 2.

FIG. 16 illustrates a configuration including a scaler 650 for the description related to the resizing process of broadcast data, and FIG. 16 illustrates the operation of multi-outputting multi-channel broadcast data according to an embodiment of the present invention. For simplicity, the present invention is not limited to the configuration of FIG. Accordingly, the configuration of FIG. 16 may further include the devices illustrated in FIG. 2.

When the DMB viewing starts, the DMB module 610 receives and outputs broadcast data (eg, TS data) corresponding to the broadcast channel selected by the user. The TS demultiplexer 620 separates main / sub channel data from the TS data transferred from the DMB module 610 and outputs the main / sub channel data. The TS demultiplexer 610 separates video data and audio data from the TS data and outputs the separated video data.

The video codec 630 decodes and outputs video data in digital form from the TS demultiplexer 620. The audio codec 640 decodes and outputs audio data in digital form from the TS demultiplexer 620. That is, the video codec 630 and the audio codec 640 output a video signal and an audio signal.

As illustrated in FIG. 15, the scaler 650 resizes and outputs broadcast data of a corresponding broadcast channel allocated to each screen divided by the number of broadcast channels in the channel list 510 according to the position of the split screen. The scaler 650 may further include a screen divider for splitting the display unit 680 by the number of broadcast channels in the channel list 510, or may form a separate screen divider. In this case, it is assumed that the number of broadcast channels in the channel list is nine (channel 1 (Ch1) to channel 9 (Ch9)), and among the nine broadcast channels, the broadcast channel requested by the user is called channel 1 (Ch1). Assume

Accordingly, broadcast data of each broadcast channel resized through the scaler 650 is divided into main and subchannels and output through a corresponding divided screen. At this time, the broadcast data of channel 1 (Ch1) selected by the user is a stream broadcast data 671 including a video signal and an audio signal to play the video on the first split screen 681 and simultaneously to output the audio signal through the speaker. Is played. The broadcast data of the remaining channels 2 (Ch2) to 9 (Ch9) is divided into the latest image data, for example, still images (Still Images) 673, 675, and 677, respectively, by I-frame detection. The screens 683, 685, and 687 are output.

That is, the DMB receiver resizes and plays the screen according to the position of the divided screen for each broadcasting channel, and captures the last decoded raw data when moving to the next channel after playing the divided screen. Resizing and thumbnails to display. Therefore, if all search is performed for all broadcast channels, the thumbnail screen for all broadcasts can be displayed. In addition, after searching the entire broadcast, the channel list may be displayed as a thumbnail. Through this, the user can easily and quickly move to the desired broadcasting channel to watch the corresponding broadcasting data.

In addition, in the thumbnail display state as described above, the DMB receiving apparatus may provide a playback screen having various sizes according to a user request, which will be described with reference to FIGS. 17 and 18.

17 is a diagram schematically illustrating an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention.

In particular, FIG. 17 illustrates an example of dividing a screen by the number of broadcast channels (for example, nine) and displaying broadcast data of a main channel among multi-channel broadcast data.

Referring to FIG. 17, when the DMB viewing starts, the DMB receiving apparatus provides a channel list screen as indicated by reference numeral 710. In this case, the channel list may be configured using broadcast channels searched by a DMB receiver in the case of terrestrial DMB, and may be configured using EPG information in the case of satellite DMB, and also preferred by the user based on a user setting method. It can be composed of broadcast channels.

If a predetermined broadcast channel (eg, channel 1 (Ch1)) is selected by the user in the channel list display state as in the example of reference 710, the DMB receiving apparatus displays broadcast data of the corresponding broadcast channel as indicated by reference numeral 720. FIG. do. In this case, the broadcast data display may include a video signal and an audio signal. Accordingly, the video signal is displayed through the display unit 720 and the audio signal is simultaneously output through the speaker.

When the <view all channels> function is requested from the user in the broadcast data display state as shown by the reference numeral 720, the DMB receiving apparatus divides and displays the screen as in the examples of the reference numerals 731 to 735. In this case, it is preferable to divide the screen by the number of broadcast channels. That is, although FIG. 17 illustrates the case in which the number of broadcast channels is nine (731), as shown by reference numeral 733 and reference numeral 735, the screen division of the present invention is configured in various ways depending on the number of broadcast channels provided. Of course you can. In addition, in the channel list display state indicated by reference numeral 710, the <channel full view> may also be performed. Hereinafter, the operation of FIG. 17 will be described using reference numeral 731 as an example.

In the multi-channel broadcast data display as indicated by reference numeral 731, it is preferable to display the main and sub-channels separately. Therefore, stream broadcast data is output to the main channel (eg, channel 1 (Ch1)) screen selected and viewed by the user, and a still image is displayed on the remaining subchannels (eg, channel 2 (Ch2) to channel 9 (Ch9)) screen. Print (Still image). The still image outputs the latest image data based on each I-frame detected from broadcast data of a broadcast channel allocated to each subchannel screen.

If the main channel (for example, channel 1 (Ch1)) is selected by the user in the multi-channel broadcast data display state as shown in the example of reference 731, the DMB receiving apparatus is assigned to the main channel as indicated by reference numeral 740. The split screen is enlarged by a predetermined size based on a preset method and then the stream broadcast data is displayed. At this time, as the size of the split screen allocated to the main channel is changed, the DMB receiving apparatus further resizes and outputs the size of the stream broadcast data output on the screen corresponding to the position and size of the enlarged split screen. It may include.

When the main channel (eg, channel Ch1) enlarged to a predetermined size is selected by the user in the multichannel broadcast data display state as shown by reference numeral 740, the DMB receiving apparatus returns to the main channel as indicated by reference numeral 750. FIG. The stream data is displayed after the allocated split screen is enlarged to the full screen. In this case, as the size of the split screen allocated to the main channel is changed, the DMB receiving apparatus may further include resizing and outputting the size of the stream broadcast data output on the entire screen accordingly.

Although not illustrated in FIG. 17, the reverse order may be performed by, for example, a function such as <back> in the enlarged screen.

18 is a diagram schematically showing an example of a user interface for simultaneously outputting multi-channel broadcast data in a DMB receiving apparatus according to an embodiment of the present invention.

In particular, FIG. 18 illustrates an example of dividing a screen by the number of broadcast channels (for example, nine) and displaying broadcast data according to switching of a main channel among multi-channel broadcast data. FIG. 18 illustrates an example of an operation in which an initial main channel is allocated to channel 1 (Ch1) and the broadcast data of the main channel is output through a split screen of reference numeral 805, as in the example of reference numeral 810.

Referring to FIG. 18, when the DMB receiving apparatus generates a request for moving from a user to another channel in the multichannel broadcast data display state 810 by the <view all channels> function, as shown in an example of reference numeral 820. The screen focus is displayed on a screen (eg, channel 2 (Ch2)) 825 that is moved based on a user request on the previous screen (eg, channel 1 (Ch1)) 805. When a selection signal is generated from a user by a key input in the focus state of the screen 825, the DMB receiving apparatus outputs the stream broadcast data of the corresponding broadcast channel through the focused screen as shown in the example 830 (835). ).

That is, in the state 825, the latest image data of the I-frame detected by the broadcast data of the broadcast channel is displayed. In the state 835, the stream broadcast data of the broadcast channel is output. In addition, the previous main channel screen (eg, reference numeral 805) detects an I-frame from the last decoded broadcast data before the main channel is switched and outputs the latest image data. In this case, the latest image data will be described with an example of generating through I-frame detection of broadcast data, but the present invention is not limited thereto. For example, when receiving broadcast data, raw data decoded last may be captured and output as the latest image data. That is, when moving to another channel after playing the divided screen for a predetermined time, the last decoded raw data may be captured to generate an image, and the generated image may be generated and displayed in thumbnail form according to the position and size of the divided screen.

If the screen 835 of the currently focused main channel (eg, channel 2 (Ch2)) is selected by the user in the multi-channel broadcast data display state as shown in the example of reference 830, the DMB receiving apparatus uses the example of reference 840. In operation 845, the split screen 835 allocated to the main channel is enlarged by a predetermined size based on a preset method, and the stream broadcast data is displayed on the enlarged screen 845. At this time, as the size of the divided screen 835 allocated to the main channel is changed, the DMB receiving apparatus resizes the size of the stream broadcast data output to the enlarged screen 845 to correspond to the position and size of the enlarged screen. It may further include the process of outputting.

When the screen 845 of the currently focused main channel (eg, channel 2 (Ch2)) is selected by the user in the multichannel broadcast data display state as shown in the example of the reference numeral 840, the DMB receiving apparatus uses the example of the reference numeral 850. As shown in FIG. 850, the enlarged screen 845 allocated to the main channel is enlarged to the full screen and the stream broadcast data is displayed. At this time, as the size of the enlarged screen 845 allocated to the main channel is changed, the DMB receiving apparatus resizes the size of the stream broadcast data output to the full screen 850 corresponding to the position and size of the full screen. The process may further include outputting.

In addition, when a user requests to move to another channel, that is, channel switching, in a state of displaying stream broadcast data through a full screen as in the example of reference 850, the DMB receiving apparatus responds to the request as in the example of reference 890. After moving to a channel (eg, channel 1 (Ch1)), broadcast data of the corresponding channel (eg, channel 1 (Ch1)) is received and displayed.

Next, when a request for moving from the user to the screen 865 of the subchannel (eg, channel 1 (Ch1)) occurs in the multi-channel broadcast data display state as shown in the example of the reference numeral 840, as shown in the example of the reference numeral 860 The screen focus is displayed on the screen 865 of the sub-channel (eg, channel 1 (Ch11)) that is moved in response to a user request on the screen 845 of the previous screen (eg, channel 2 (Ch2)).

As shown in the example of reference numeral 860, if a selection signal is generated by a key input or the like from the user while the sub-channel screen 865 is in focus while reproducing the stream broadcast data through the screen of the main channel, DMB reception is performed. The device outputs stream broadcast data of the corresponding broadcast channel through the focused screen 865 as shown in the example of 870.

That is, in the state 865, the latest image data of the I-frame detected by the broadcast data of the corresponding broadcast channel is displayed. In the state 875, the stream broadcast data of the corresponding broadcast channel is output. In addition, the previous main channel screen is automatically reduced to the initial split screen size, and the latest image data is output by detecting an I-frame from the last decoded broadcast data before the main channel is switched.

If the screen 875 of the currently focused main channel (eg, channel 1 (Ch1)) is selected by the user in the multi-channel broadcast data display state as shown in the example of the reference 870, the DMB receiving apparatus uses the example of the reference 880. As described above, the split screen 875 allocated to the main channel is enlarged by a predetermined size based on a preset method, and the stream broadcast data is displayed on the enlarged screen 885 in operation 885. At this time, as the size of the divided screen 875 allocated to the main channel is changed, the DMB receiving apparatus resizes the size of the stream broadcast data output to the enlarged screen 885 to correspond to the position and size of the enlarged screen. It may further include the process of outputting.

If the screen 885 of the currently focused main channel (eg, channel 1 (Ch1)) is selected by the user in the multi-channel broadcast data display state as shown in the example of the reference 880, the DMB receiving apparatus uses the example of the reference 890. As shown in FIG. 850, the enlarged screen 885 allocated as the main channel is enlarged to the full screen 890 and the stream broadcast data is displayed (850). At this time, as the size of the enlarged screen 885 allocated to the main channel is changed, the DMB receiving apparatus resizes the size of the stream broadcast data output to the full screen 890 to correspond to the position and size of the full screen. The process may further include outputting.

As described above, the apparatus for receiving digital broadcasting of the present invention simultaneously displays the video information of the multi-channel by updating the video information of the sub-channel displayed together with the main channel for each I-frame transmission period of the sub-channel data. For this reason, the present invention has the advantage of convenient channel selection of the user. The present invention also displays a main channel screen for outputting real-time image information and a plurality of sub-channel screens for displaying recent image information together, and easily switches between main and sub-channels by selecting one of the sub-channels and the main channel screen. It can work.

In addition, the present invention has the effect of supporting the digital broadcast channel movement / selection more easily and quickly by automatically dividing the screen by the number of digital broadcast channels to provide a multi-channel broadcast data in the form of a thumbnail (thumbnail).

Claims (68)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete In the digital broadcast data providing method, Simultaneously or sequentially receiving digital broadcast data for one main channel and at least one subchannel; Resizing real-time broadcast data for the one main channel and at least one still image for the at least one sub-channel corresponding to the position and size of the screen divided by the number of multi-channels; And simultaneously outputting the real time broadcast data and the at least one still image on one screen. 36. The method of claim 35 wherein And updating the at least one still image for the at least one subchannel at a predetermined period. delete 36. The method of claim 35 wherein And sequentially selecting one or more channels based on a channel list including a plurality of channel information and setting them as receiving channels for the main / sub-channels. 39. The method of claim 38, wherein the channel list is And a predetermined number of channel information as a number of subchannels to be simultaneously output on one screen together with the main channel. 39. The method of claim 38, wherein the channel list is A digital broadcast data providing method comprising a plurality of channel information selected by the user. 39. The method of claim 38, wherein the channel list is And a plurality of favorite channel information automatically generated based on previous viewing information. 39. The method of claim 38, wherein the channel list is And at least one channel information searched by the digital broadcast receiver. 39. The method of claim 38, wherein the channel list is And at least one channel information generated based on electronic program guide information. The method of claim 35, wherein the simultaneous output process Outputting real-time broadcast data for a main channel; And And sequentially detecting the real-time broadcast data and the number of I-frame data equal to a preset number as the number of subchannels to be simultaneously output on one screen and outputting the same through the corresponding subchannels. How data is provided. 36. The method of claim 35 wherein And changing the transmission path of the main / sub-channel based on a request for switching the main / sub-channel or a pre-stored main / sub-channel switching condition of the user. 36. The method of claim 35 wherein Dividing and outputting the real-time broadcast data and the still image into a specific display area, respectively; Receiving user selection information for selecting one of the specific display areas; And And performing any one of main / sub channel switching or enlarged display of the corresponding area based on the display area selection information of the user. 47. The method of claim 46 wherein And when the display area selection information for the main channel region is input, expanding the main channel region based on pre-stored enlarged display information. 47. The method of claim 46 wherein And switching the corresponding subchannel and the main channel when the display area selection information of one of the subchannel regions is input. 36. The method of claim 35 wherein Dividing a screen corresponding to the number of the received digital broadcast data; Displaying the real time broadcast data on any one of the divided screens; And And displaying the still image of the I-frame on the screens other than the one screen, respectively. delete In the digital broadcast data providing method, Displaying a channel list when a user requests to watch digital broadcasting; Displaying broadcast data of a corresponding channel selected by a user on a full screen; Dividing the screen into a plurality of screens corresponding to the number of channels included in the channel list when the channel list is displayed or when the entire channel view is requested while the broadcast data is being played; Resizing the broadcast data of the corresponding channel and at least one still image corresponding to at least one broadcast data of channels other than the corresponding channel according to the position and size of the split screen corresponding to the number of channels; Displaying the broadcast data on any one of the plurality of divided screens; And And simultaneously or sequentially displaying the at least one still image on each of screens other than the one screen. delete The method of claim 51, wherein the still image And a video of an I-frame detected from broadcast data of channels other than a channel providing the broadcast data, among the plurality of channels in the channel list. The method of claim 53, And detecting the I-frame from video data decoded from respective broadcast data of corresponding channels. The method of claim 51, wherein the still image And capturing the raw data decoded last in channels other than the channel providing the broadcast data among the plurality of channels in the channel list. The method of claim 51, And updating the at least one still image of the broadcast data of the other channels at a predetermined cycle. The method of claim 51, And sequentially setting one or more channels based on a user's request and setting the reception channel for a primary / sub channel. 53. The method of claim 51 wherein the channel list is Digital broadcasting data providing method comprising a predetermined number or more of the channel information to the number of main / sub-channel to be output simultaneously on one screen. 53. The method of claim 51 wherein the channel list is A digital broadcast data providing method comprising a plurality of channel information selected by the user. 53. The method of claim 51 wherein the channel list is And a plurality of favorite channel information automatically generated based on previous viewing information. 53. The method of claim 51 wherein the channel list is And at least one channel information searched by the digital broadcast receiver. 53. The method of claim 51 wherein the channel list is And at least one channel information generated based on electronic program guide information. The method of claim 51, And changing a transmission path between the broadcast data display channel and the still image display channel requested for channel switching based on a user's channel switching request or a previously stored channel switching condition. The method of claim 51, Dividing and outputting the broadcast data and the still images into a specific display area, respectively; Receiving user selection information for selecting one of the specific display areas; And And performing any one of a channel switching or an enlarged display of a corresponding area based on the display area selection information of the user. 65. The method of claim 64, And displaying enlarged display of the broadcast data display area based on pre-stored enlarged display information when selection information regarding the broadcast data display area is input. 65. The method of claim 64, And converting a corresponding channel when display region selection information of one of the still image display regions is input. The method of claim 51, Dividing a screen corresponding to the number of received digital broadcast data; Displaying broadcast data on one of the divided screens; And And displaying a still image of an I-frame on each of screens other than the one screen. 67. The method of claim 66 And resizing and outputting the broadcast data and the still images corresponding to the position and size of a screen divided by the number of multi-channels.

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