KR100793736B1 - Digital broadcasting receiver for simultaneously displaying multi-channel video - Google Patents

Abstract

The present invention relates to a digital broadcast receiver, comprising: a digital broadcast receiver for simultaneously receiving digital broadcast data for one main channel and at least one subchannel; A digital broadcast output unit for simultaneously outputting real time broadcast data of the one main channel and a still image of the at least one subchannel on a single screen; And a still image updating unit updating the still image for the at least one subchannel at a predetermined period. 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 Broadcast, Multi-Channel, Sync, EPG, Channel Switching, I-Frame

Description

Digital broadcasting receiver for simultaneously outputting multiple channels of video {DIGITAL BROADCASTING RECEIVER FOR SIMULTANEOUSLY DISPLAYING MULTI-CHANNEL VIDEO}

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

2 is an exemplary diagram for a channel providing a broadcast service in the current digital multimedia broadcasting system.

3 is a schematic block diagram of an apparatus for receiving digital multimedia broadcasting according to a first embodiment of the present invention;

4 is a schematic block diagram of a digital multimedia broadcasting receiving device according to a second embodiment of the present invention;

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

FIG. 6 is a view showing an example of a method of simultaneously outputting a multi-channel image using a digital multimedia broadcasting receiver according to the first and second embodiments of the present invention; FIG.

7 is a schematic block diagram of a digital multimedia broadcasting receiving device according to a third embodiment of the present invention;

8 is a schematic block diagram of a digital multimedia broadcasting receiving device according to a fourth embodiment of the present invention;

FIG. 9 is a diagram illustrating an example of a method of simultaneously outputting a multi-channel image using a digital multimedia broadcasting receiver according to the third and fourth embodiments of the present disclosure; FIG.

10 illustrates configuration examples of MPEG image data processed by a digital multimedia broadcasting reception device according to the first to fourth embodiments of the present invention;

11A and 11B illustrate examples of screens for multi-outputting images of multiple channels in a digital multimedia broadcasting receiver according to the first to fourth embodiments of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver, and more particularly, to a digital broadcast receiver for simultaneously outputting multiple channels of video.

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 for 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, a DMB) capable of receiving the DMB data has recently been developed. (DMB) phone) has been developed and commercialized. Thus, users can watch DMB using the DMB phone while on the move.

The DMB typically provides broadcast program information using an electronic program guide (hereinafter, referred to as an 'EPG'). Therefore, when a user who is watching a DMB wants to check information about channels other than the channel currently being viewed, the user must manually select an EPG menu. In addition, the EPG information provides text-based information such as a channel name or broadcast time, so that the user cannot intuitively recognize broadcast program information of the corresponding channel using only the EPG information.

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

That is, in the related art, EPG information is provided using fixed image data for each program. Therefore, in the related art, it is not possible to provide program information that changes over 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 digital broadcast receiving device for convenient user's channel selection by simultaneously displaying the latest image information of the multi-channel.

The present invention also provides a digital display for performing main / sub channel switching by displaying a main channel screen for outputting real-time image information and a plurality of sub channel screens for displaying recent image information, and selecting one of the sub channels and the main channel screen. It is intended to provide a broadcast receiving device.

In order to achieve the above object, a digital broadcast receiver provided in the present invention includes a digital broadcast receiver for simultaneously receiving digital broadcast data for one main channel and at least one subchannel; A digital broadcast output unit for simultaneously outputting real time broadcast data of the one main channel and a still image of the at least one subchannel on a single screen; And a still image updater for updating the still image for the at least one subchannel at a predetermined period.

In this case, the digital broadcast receiving device further comprises a channel setting control unit for setting the reception channel information of the digital broadcast receiving unit.

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 the 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.

In addition, the channel setting control unit controls to change the 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 when the main channel and the sub channel are each one. It is desirable to output a signal.

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.

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.

1 is a schematic configuration diagram of a conventional DMB system. In particular, Figure 1 is a configuration diagram for a satellite DMB system.

Referring to FIG. 1, a satellite DMB system includes a broadcasting station 100, a digital broadcasting satellite 200, a gap filler 300, and a DMB receiver 400.

The broadcasting station 100 generates various broadcasting signals (14 GHz) such as moving images, music videos, dramas, and transmits them to the digital broadcasting satellite 200, and the digital broadcasting satellite 200 broadcasts the broadcasting signals 14 transmitted from the broadcasting station 100. GHz) and transmits a broadcast signal of 2.6 GHz band or 14 GHz band to the ground. In addition, the Gap Filler 300 receives a broadcast signal of a 14 GHz band from the digital broadcast satellite 200 and outputs a broadcast signal of a 2.6 GHz band. Then, the DMB receiver 400 receives the broadcast signal of the 2.6 GHz band from the digital broadcasting satellite 200 or the repeater 300.

Such a satellite DMB system typically transmits content generated according to MPEG (Motion Picture Experts Group, hereinafter referred to as 'MPEG')-4 standard using MPEG-2 Transport Stream (TS). That is, the broadcasting station 100 converts the contents generated according to the MPEG-4 standard into the MPEG-2 TS and transmits them, and the DMB data passed through the digital broadcasting satellite 200 and the repeater 300 in the MPEG-2 TS format is a DMB receiver ( And then converted back to MPEG-4 format.

According to the DMB broadcasting standard, the DMB system provides a broadcasting service through a plurality of code division multiplex (CDM) channels, and an example of such a CDM channel is illustrated in FIG. 2.

FIG. 2 is an exemplary diagram for a channel (ie, a CMD channel) for providing a broadcast service in a current DMB system. Referring to FIG. 2, the CDM channel is a pilot for transmitting configuration information of a CDM channel, that is, pilot information. A channel, a CAS (Conditional Access System) channel transmitting authentication information for receiving DMB broadcasting, that is, a receiver restriction information, an EPG channel transmitting information about a service channel, that is, a digital broadcasting channel guide information, and At least one AV broadcast channel (also called a media channel) that transmits actual transport stream packet data, that is, broadcast traffic.

At this time, the AV broadcast channel is composed of two CDM channels in the case of video broadcasting and one CDM channel in the case of audio broadcasting. Accordingly, the DMB system can add the number of broadcast channels that can be simultaneously received by increasing the number of AV broadcast channels. That is, the multi-channel DMB data can be simultaneously received.

Currently, four CDM channels can be used as AV broadcast channels. Therefore, two video broadcasts or one video broadcast and two audio broadcasts can be simultaneously received.

The present invention utilizes the characteristics of the CDM channel, and the receiving apparatus of the present invention continuously receives broadcast data of two CDM channels while maintaining one reception channel, and at least one CDM channel changes a preset channel. Based on the condition, broadcast data is received while changing a plurality of reception channels. 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 'sub channels'. In this case, the change condition is preferably any one of a change request of a user, 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.

3 is a schematic block diagram of a DMB receiving apparatus according to a first embodiment of the present invention. Referring to FIG. 3, 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 selects and receives a Code Division Multiplexing (CDM) channel corresponding to a broadcast channel selected by a user, and outputs transport stream data for the corresponding 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 to 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 (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, the subchannel broadcast data rotator I-frame data is detected at every I-frame transmission period of the subchannel broadcast data. If only one CDM channel is set in the DMB module 210 for subchannel reception, the subchannel broadcast data transmitted to the subchannel processor 140 will include only video data. Therefore, I-frame detector 141 detects I-frames from the video data. However, when two CDM channels are configured for subchannel reception by the DMB module 210, the broadcast data of the subchannels 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.

When the I-frame image of a plurality of subchannels changed with a predetermined channel change period is to be displayed on one screen, the image synthesizer 160 is assigned to each subchannel (especially, the previous subchannel). This is for reference to an I-frame image. 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. 5. Referring to FIG. 5, the I-frame information management table 40 includes a channel identifier 41 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 displaying an image signal output from the image synthesizer 160. do. 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 favorite channel information automatically generated based on a plurality of subchannel information selected by a user or previous viewing information, and stores the channel list based on a preset channel change condition. It is preferable to sequentially select the channels included in the 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 fan nulls 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 control unit 180 preferably receives from the I-frame detector 141 that an I-frame for a specific subchannel has been detected. At this time, since the I-frame includes reference image information for MPEG compression and reconstruction as described above, it is possible to generate an image of the 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.

4 is a schematic block diagram of a DMB broadcast receiving apparatus according to a second embodiment of the present invention. Referring to FIG. 4, the DMB receiving apparatus 200 according to the second embodiment of the present invention includes 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. 4 shows an example of a case where two subchannel information are received at once when there is an additional CDM channel in the DMB receiving apparatus illustrated in FIG. 3.

Thus, each of the devices is similar in function to the devices illustrated in FIG. 3.

That is, the DMB module 210 is the DMB module 110 of FIG. 3, the TS demultiplexer 220 is the TS demultiplexer 120 of FIG. 3, and the main channel buffer 230 is the main channel buffer 130 of FIG. 3. The subchannel processor 240 is the subchannel processor 140 of FIG. 3, the A / V codec 250 is the A / V codec 150 of FIG. 3, and the image synthesizer 260 is the image of FIG. 3. The synthesis unit 160, the DMB output unit 270, the DMB output unit 170 of FIG. 3, the channel setting control unit 280, the channel setting control unit 180 of FIG. 3, and the input unit 290 of FIG. 3. 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 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. 4, the functions of the DMB module 210, the TS demultiplexer 220, the subchannel processor 240, and the channel setting controller 280 are changed as the subchannels simultaneously received increase. Meanwhile, devices other than the above devices operate similarly to those illustrated in FIG. 3. Therefore, a detailed description of each device other than the above devices will be omitted.

4 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. 3. 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 for CDM processing improves.

FIG. 6 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 embodiments of the present invention. Referring to FIG. 6, a method of simultaneously outputting multiple channels of images using the DMB receiving apparatuses according to the first and second embodiments of the present invention is as follows. Hereinafter, the DMB receiving apparatuses according to the first and second embodiments will be abbreviated as DMB receiving apparatuses.

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. 3.

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 specific process for the separation detection is similar to that mentioned in the functional description of the TS demultiplexer 120 with reference to FIG. 3.

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. 3.

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 described in the function description of the channel setting controller 180 of FIG. 3.

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.

7 is a schematic block diagram of a DMB receiving apparatus according to a third embodiment of the present invention. In particular, the description will be given of main / sub channel switching when the main channel and the sub channel received at the same time are each one.
Referring to FIG. 7, the DMB receiver 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. 7 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. 3. To this end, the DMB receiving apparatus illustrated in FIG. 7 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. 3.

That is, the DMB module 310 is the DMB module 110 of FIG. 3, the TS demultiplexer 320 is the TS demultiplexer 120 of FIG. 3, and the main channel buffer 330 is the main channel buffer 130 of FIG. 3. The subchannel processor 340 is the subchannel processor 140 of FIG. 3, the A / V codec 350 is the A / V codec 150 of FIG. 3, and the image synthesizer 360 is the image of FIG. 3. The synthesis unit 160, the DMB output unit 370, the DMB output unit 170 of FIG. 3, the channel setting control unit 380, the channel setting control unit 180 of FIG. 3, and the input unit 390 of FIG. 3. 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 prestored 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. 7, 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.

8 is a schematic block diagram of a DMB receiving apparatus according to a fourth embodiment of the present invention. In particular, here, as in the description of FIG. 7, the main / sub channel switching will be described when the main channel and the sub channel simultaneously received are each one.
Referring to FIG. 8, 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 FIG. 8, in the DMB receiving apparatus illustrated in FIG. 3, the main channel and the subchannel are switched based on the request for switching between the main channel and the subchannel. Shows an example of a DMB receiving apparatus for storing the information. To this end, the DMB receiver 400 illustrated in FIG. 8 further includes a subchannel buffer 445 in the subchannel processor 440 and includes second to fourth switches SW2, SW3, and the like 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 functionality is similar to the devices illustrated in FIG. 3.

That is, the DMB module 410 is the DMB module 110 of FIG. 3, the TS demultiplexer 420 is the TS demultiplexer 120 of FIG. 3, and the main channel buffer 430 is the main channel buffer 130 of FIG. 3. , The A / V codec 450 is the A / V codec 150 of FIG. 3, the image synthesizing unit 460 is the image synthesizing unit 160 of FIG. 3, and the DMB output unit 470 is the DMB of FIG. 3. The output unit 170, the channel setting control unit 480 has a similar function to the channel setting control unit 180 of FIG. 3, 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. 3 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. 8, 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.

8 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 I-frame is detected from the broadcast data input to the main channel buffer 430 by inputting the broadcast data transferred to the main channel buffer 430 before the main / sub channel switching request to the I-frame detector 441. do.

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. 8 also buffers broadcast data received through a subchannel, and switches an output terminal of the buffered data and an input terminal of an I-frame detector based on a main / subchannel switching request. This allows switching between primary and secondary channels with minimal time delay due to channel switching.

9 is a diagram illustrating an example of a method of simultaneously outputting images of two channels using the DMB receiving apparatuses according to the third and fourth embodiments of the present invention.
Referring to FIG. 9, a method of simultaneously outputting images of two channels using the DMB receiving apparatuses according to the third and fourth embodiments of the present invention is as follows. In particular, FIG. 9 is a flowchart illustrating a method of switching between a main channel and a subchannel while simultaneously outputting images of two channels. Hereinafter, the DMB receiving apparatuses according to the third and fourth embodiments will be abbreviated as DMB receiving apparatuses.

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 one by one. 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. 3.

When the user starts watching DMB (S210), the DMB receiving apparatus receives broadcast data for two 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 specific process for the separation detection is similar to that mentioned in the functional description of the TS demultiplexer 120 with reference to FIG. 3.

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 (S235). In this case, the processes S230 and S235 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. 3.

As such, the DMB receiving apparatus that detects I-frame data from the subchannel data after separating the main / subchannel data is synthesized with the detected I-frame data and the main channel image (S240). The audio data through the 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. 7, the transmission path of the first switch SW1 is changed, and in the case of the DMB receiving apparatus illustrated in FIG. 8, the transmission paths of the second to fourth switches SW2 to SW4 are changed. do. Each of these transmission path change procedures is as mentioned in the description with reference to FIGS. 7 and 8.

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. 3.

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

10 is a configuration example of MPEG image data processed by a DMB receiving apparatus according to the first to second embodiments of the present invention. That is, FIG. 10 is a diagram illustrating examples of video streams for conventional MPEG image data, and (a) illustrates video of main channel broadcast data received by a DMB receiving apparatus according to the first to fourth embodiments of the present invention. An example of a stream, (b) an example of a video stream of first subchannel broadcast data received by the DMB receiving apparatus, and (c) an example of a video stream of second subchannel broadcast data received by the DMB receiving apparatus. (D) is an example of a video stream of third subchannel broadcast data received at the DMB receiving apparatus, and (e) is an example of a video stream of fourth subchannel broadcast data received at the DMB receiving apparatus. (f) is an example of a video stream of fifth subchannel broadcast data received at the DMB receiving apparatus, and (g) is an example of a video stream of sixth subchannel broadcast data received at the DMB receiving apparatus. , (h) is an example of a video stream of seventh subchannel broadcast data received at the DMB receiving apparatus, and (i) is an example of a video stream of eighth subchannel broadcast data received at the DMB receiving apparatus.

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

11A and 11B are diagrams illustrating examples of screens for multi-outputting images of multiple channels in the DMB receiving apparatuses according to the first to fourth embodiments of the present invention. 11A shows an example of the case of displaying one main channel and eight subchannels, and FIG. 11B shows an example of the case 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. 11A and 11B, but the broadcast data of the subchannels as described with reference to FIGS. 3 to 9. 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 in which 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 receiving one main channel and at least two, that is, two or more subchannels simultaneously. 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.

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.

Claims (31)

In the digital broadcast receiver, A digital broadcast receiver for simultaneously receiving digital broadcast data for one main channel and at least one subchannel; A digital broadcast output unit for simultaneously outputting real time broadcast data of the one main channel and a still image of the at least one subchannel on a single screen; And And a still image updater for updating the still image for the at least one subchannel at a predetermined period. delete The method of claim 1, And a channel setting controller configured to set reception channel information of the digital broadcasting receiver. The method of claim 3, wherein the channel setting control unit And changing and setting reception channel information of the subchannel based on a preset channel change condition. The method of claim 4, wherein the channel setting control unit And storing a channel list including a plurality of channel information and sequentially selecting one or more channels included in the channel list based on the channel change condition and setting the received channel for a subchannel. . The method of claim 5, wherein the channel list is And a predetermined number of channel information as a number of subchannels to be simultaneously output on one screen. The method of claim 6, wherein the channel list is And a plurality of channel information selected by a user. The method of claim 6, wherein the channel list is And a plurality of favorite channel information automatically generated based on previous viewing information. The method of claim 4, wherein the channel change condition is And a user input of a change request, a preset channel change cycle, and I-frame data detection of a current reception channel. The method of claim 3, wherein the channel setting control unit And a reception channel is set based on channel information input when the channel change request is input in response to a user input of a channel change request. The method of claim 5, wherein the still image updating unit An I-frame detector for detecting I-frame data from the subchannel data at every I-frame transmission period of the subchannel data; And 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. The method of claim 11, wherein the I-frame detector And storing I-frame transmission period information of the subchannel data in advance and detecting data received for each period as I-frame data. The method of claim 11, wherein the I-frame detector And comparing the size of the received data stream and detecting data having a relatively large size as I-frame data. The method of claim 11, wherein the I-frame storage unit And storing and updating I-frame data for each channel set as a reception channel for the subchannel. 15. The digital broadcasting output unit of claim 14, wherein the digital broadcasting output unit A main channel buffer unit for storing real-time broadcast data for the main channel; And And an image synthesizer configured to generate screen output information using real-time broadcast data stored in the main channel buffer unit and I-frame data stored in the I-frame information storage unit. The method of claim 15, wherein the image synthesizing unit A screen output information is generated by sequentially selecting the same number of I-frame data as the number preset to the number of subchannels to be simultaneously output on one screen from the I-frame information storage unit and synthesizing them with the video signal of the main channel. Digital broadcast receiving device, characterized in that. The method of claim 3, wherein the digital broadcast receiver A demultiplexer for separating digital broadcast signals for each of the simultaneously received channels; And And a first switch configured to change a main channel transmission path and a subchannel transmission path at an output terminal of the demultiplexer. The method of claim 17, wherein the channel setting control unit When each of the main channel and the sub-channel is one, the control signal for changing the transmission path of the first switch based on the user's main / sub-channel switching request or pre-stored main / sub-channel switching conditions, characterized in that for outputting Digital broadcast receiving apparatus. 19. The method of claim 18, wherein the main / sub channel switching condition is Digital broadcast receiving device characterized in that the main / sub-channel switching period. 19. The method of claim 18, wherein the main / sub channel switching condition is A digital broadcast receiving device, characterized in that the main / sub-channel switching time. 15. The digital broadcasting output unit of claim 14, wherein the digital broadcasting output unit A main channel buffer unit for storing 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 And a switch unit connecting an output terminal of the main channel buffer unit or the sub channel buffer unit to an input terminal of the image synthesis unit. The method of claim 21, wherein the still image updating unit And a second switch connecting one of the main channel transmission path and the subchannel transmission path to an input terminal of the I-frame detector. The method of claim 22, wherein the channel setting control unit When each of the main channel and the sub channel is one, outputs 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. Digital broadcast receiving device, characterized in that. 24. The method of claim 23, wherein the main / sub channel switching condition is Digital broadcast receiving device characterized in that the main / sub-channel switching period. 24. The method of claim 23, wherein the main / sub channel switching condition is A digital broadcast receiving device, characterized in that the main / sub-channel switching time. The method of claim 23, wherein the switch unit The output terminal of any one of the main channel buffer unit and the subchannel buffer unit is connected to an input terminal of the image synthesizer based on a control signal of the channel setting controller. When the second switch connects the transmission path of the main channel and the input terminal of the I-frame detector, the output terminal of the sub-channel buffer is connected to the input terminal of the image synthesis unit, And when the second switch connects the transmission path of the subchannel and the input terminal of the I-frame detector, the output terminal of the main channel buffer to the input terminal of the image synthesizer. The method of claim 23, wherein the second switch Based on the control signal of the channel setting control unit, any one of the transmission path of the main channel or the sub-channel transmission path is connected to the input terminal of the I-frame detector, When the switch unit connects the main channel buffer unit to the input terminal of the image synthesis unit, the subchannel transmission path is connected to the input terminal of the I-frame detector, And the main channel transmission path is connected to an input terminal of the I-frame detector when the switch unit connects the subchannel buffer unit to an input terminal of the image synthesis unit. According to claim 1, wherein the digital broadcast output unit And dividing the real time broadcast data and the still images into a specific area and outputting the divided data. The method of claim 28, Further comprising an input unit for receiving the user's selection information for selecting one of the specific area, The digital broadcast output unit 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 through the input unit. 30. The digital broadcasting output unit of claim 29, wherein the digital broadcasting output unit And when the display area selection information for the main channel region is input, enlarge the main channel region based on prestored enlarged display information. 30. The digital broadcasting output unit of claim 29, wherein the digital broadcasting output unit And a corresponding subchannel and a main channel are switched when display region selection information of one of the subchannel regions is input.

Images