KR101303258B1 - Device and method for displaying multi-screen in digital broadcasting receiver - Google Patents

Abstract

The multi-screen display device of the digital broadcast receiver includes a broadcast receiver that receives broadcast data of a set primary and at least one secondary service channel, and time-divisions a frame period for each frame to determine all the frame video data of the primary service channel and the secondary service channel. A decoder comprising a video decoder for decoding video data of a set frame, an audio decoder for decoding audio data of a preset service channel, and video data of a decoded primary and secondary service channel to be displayed in a set multi-screen. A multi-screen processing unit for multiplexing and outputting, a display unit for displaying video data output from the multi-screen processing unit in multiple screens, and a speaker for reproducing decoded audio data.

Digital Broadcast Receiver, DVB, Multi Screen, PIP

Description

DEVICE AND METHOD FOR DISPLAYING MULTI-SCREEN IN DIGITAL BROADCASTING RECEIVER}

1 is a diagram showing the structure of a digital broadcast receiver for changing a service channel according to an embodiment of the present invention.

Fig. 2 is a diagram showing the configuration of the broadcast receiver 110 of the DVB-H digital broadcast receiver.

3 is a diagram showing the configuration of a protocol processing unit 120 of the DVB-H digital broadcast receiver.

4A to 4F are diagrams illustrating an IP-based service channel data structure received by the DVB-H digital broadcast receiver.

5A through 5D illustrate a procedure of processing data of at least two service channels into a multi-screen according to an embodiment of the present invention.

FIG. 6 is a diagram for describing a procedure of decoding and outputting burst data of a primary and a secondary service channel received for display on a multi-screen according to an embodiment of the present invention; FIG.

7A to 7G show timings for decoding data of a primary service channel and a secondary service channel in the video decoder 900.

8A to 8C are diagrams showing the configuration of the multi-screen processor 140 according to an embodiment of the present invention.

9 is a flowchart illustrating a procedure of displaying broadcast data of a main service channel and at least one sub service channel in a multi-screen by a digital broadcast receiver according to an embodiment of the present invention.

10 is a flowchart illustrating an operation procedure of the decoding process of FIG.

11A and 11B are flowcharts illustrating a multi-screen processing procedure of video data according to an embodiment of the present invention.

12 is a diagram illustrating a configuration of a mobile terminal having a digital broadcast receiver according to an embodiment of the present invention.

The present invention relates to an apparatus and method for displaying broadcast data of a digital broadcast receiver, and more particularly, to an apparatus and method for displaying at least two service channel data on a multi screen.

Currently, the digital broadcast receiver receives and displays various digital broadcast signals. The digital broadcast signal is a digitally encoded and modulated signal, and the receiver must demodulate and decode the data in reverse. Therefore, the digital broadcast receiver should have a tuner, broadcast data demodulator, and broadcast data decoder. Currently, the digital broadcasting method can be roughly divided into DMB (Digital Multimedia Broadcasting) and DVB (Digital Video Broadcasting). The digital broadcasting uses a method of serving a plurality of service channels in one frequency channel, and the service channels are channels for transmitting program information and / or broadcast information of channels for transmitting digital broadcast signals broadcast from broadcasting stations. It may consist of.

In addition, current portable terminals have a trend of mounting a multimedia dedicated processor or reinforcing a multimedia function, and among the multimedia functions, a trend of mounting a digital broadcast receiver as described above. The wireless terminal may be a mobile phone, a notebook computer, a personal digital assistant, a portable multimedia player (PMP), or the like. The portable terminal may include an RF communication unit that performs a wireless communication function.

As described above, the digital broadcast receiver receives a larger number of service channel data than a general broadcast receiver. Accordingly, the user of the digital broadcast receiver can watch service channels of various genres. In this case, if multi-screens can be displayed on one display unit of the digital broadcast receiver, the user can watch broadcasts of various genres through one screen.

Accordingly, an object of the present invention is to provide an apparatus and method for displaying multiple screens of broadcast data of at least two service channels on one display unit in a digital broadcast receiver.

Another object of the present invention is to provide an apparatus and method for displaying a multi-screen by mixing broadcast data of a set frame of at least one sub-service channel on a display screen of a main service channel selected by a digital broadcast receiver.

Another object of the present invention is to display video data of a main service channel and video data of a set frame of at least one sub service channel in a multi-screen in a digital broadcast receiver, and display the video data of the sub service channel in the multi-screen display. The present invention provides a device and method for resizing to a set screen size and displaying the multi-screen by mixing the resized sub-service channel data with the data of the main service channel.

Another object of the present invention is to display video data of a main service channel and video data of a set frame of at least one sub service channel in a multi-screen in a digital broadcast receiver, and display the video data of the sub service channel in the multi-screen display. After resizing to a set screen size and determining a display position, the present invention provides an apparatus and method for displaying a multi-screen by mixing the resized sub-service channel data in the main service channel data in the determined display position.

It is still another object of the present invention to receive video data of a main service channel and video data of at least one sub service channel in a digital broadcast receiver using a time slicing scheme, and to receive video data of the sub service channel in each frame data section. If is the video data of the set frame, time division and decoding of the frame data of the main and sub service channels, otherwise only the video data of the main service channel is decoded, and the decoded main and sub service channel data can be displayed in multiple screens. The present invention provides an apparatus and method.

It is still another object of the present invention to receive broadcast data of a primary and at least one secondary service channel selected by a user in a mobile terminal having a digital broadcast receiver using a time slicing scheme, and in each frame data section, If the video data is video data of a set frame, time division and decoding of the frame data of the main and sub service channels are performed. Otherwise, only the video data of the main service channel is decoded, and the decoded main and sub service channel data are displayed in multiple screens. It is to provide an apparatus and method that can be.

A multi-screen display apparatus of a digital broadcast receiver according to an embodiment of the present invention for achieving the above object includes a broadcast receiver for receiving broadcast data of a set main and at least one sub service channel, and time division of the frame period for each frame. A decoder comprising: a video decoder for decoding all frame video data of the main service channel and video data of a set frame of a sub service channel, an audio decoder for decoding audio data of a preset service channel, and the decoded primary And a multi-screen processing unit for multiplexing and outputting video data of a sub-service channel so as to be displayed on a set multi-screen, a display unit for displaying video data output from the multi-screen processing unit on a multi-screen, and reproducing the decoded audio data. Characterized in that composed of speakers .

In addition, the multi-screen display apparatus of the DVB H-type digital broadcast receiver according to an embodiment of the present invention for achieving the above object, and a broadcast receiver for receiving burst data of the set main service channel and at least one sub-service channel; A protocol processor for extracting video and audio data of the service channels, and a video decoder for time-dividing the frame period for each frame to decode all frame video data of the main service channel and video data of a set frame of the sub-service channel. A decoding unit comprising an audio decoder for decoding audio data of a preset service channel, a multiple screen processing unit for multiplexing and outputting the video data of the decoded primary and secondary service channels so as to be displayed in a set multiple screen; Output from multi screen processor It is characterized in that it consists of a display unit for displaying the video data in a multi-screen, for reproducing the decoded audio data to a speaker.

In addition, a multi-screen display device of a portable terminal having a DVB H-type digital broadcast receiver according to an embodiment of the present invention for achieving the above object, the burst data of the set main service channel and at least one sub-service channel A broadcast receiving unit; A protocol processor for extracting video and audio data of the service channels; A video decoder for time-dividing the frame period for each frame to decode all frame video data of the main service channel and video data of a set frame of a sub-service channel; A decoder comprising an audio decoder for decoding audio data of a preset service channel; A digital broadcast receiver comprising a multiple screen processing unit for multiplexing and outputting the video data of the decoded main and sub service channels in a set multi-screen, a wireless communication unit for processing wireless communication data, and the multi-screen display mode Control the multi-screen processing operation of the primary and secondary service channel, and process the generated call through the wireless communication unit when the communication mode occurs in the multi-screen display mode, and the video data output from the multi-screen processing unit. And a display unit for displaying the call information generated in the multi-screen display mode and a speaker for reproducing the decoded audio data.

In addition, the multi-screen display method of the digital broadcast receiver according to an embodiment of the present invention for achieving the above object, the process of receiving burst data of the set main service channel and at least one sub-service channel, and Extracting video and audio data from burst data; and decoding the video frame data of the primary and secondary service channels by time-dividing the frame period if the frame video data of the secondary service channel is set at every frame decoding start. Otherwise, decoding only the video frame data of the main service channel, decoding the audio data of the preset service channel, and multiplexing the video data of the decoded main and sub service channels to be displayed in a set multi-screen. Output Jung, displays the video data to be multiplexed in the multi-screen, and will be constituted by any of the processes for reproducing the decoded audio data characteristics.

In addition, the multi-screen display method of a mobile terminal having a digital broadcast receiver according to an embodiment of the present invention for achieving the above object, the burst data of the main service channel and at least one sub-service channel set in the multi-screen display mode Receiving; Extracting video and audio data from the burst data of the received service channels; If the frame video data of the sub-service channel is set frame video data at every frame decoding start, the video frame data of the main and sub-service channels are decoded by time-dividing the frame period, otherwise only the video frame data of the main service channel is decoded. Decoding audio data of a preset service channel; Multiplexing and outputting video data of the decoded primary and secondary service channels so that the decoded video data of the primary and secondary service channels can be displayed on a set multiple screen; Displaying the multiplexed video data on a multi-screen and playing the decoded audio data, displaying a multi-screen, and receiving subscriber information on the multi-screen displayed when an incoming call occurs in the multi-screen display mode. And displaying the incoming call alert, and forming a communication channel with the selected service channel when an outgoing signal is generated in the multi-screen display mode, and transmitting outgoing information.

In the above embodiments, the set frame video data of the sub service channel decoded by the video decoder may include frame video data obtained by directly encoding the frame video data. Here, the set frame video data of the sub service channel may be intra frame video data, and the set frame video data of the sub service channel may be intra-frame video data and a pre-via frame encoded with reference to the intra frame video data. It may consist of video data.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. It should be noted that the same configurations of the drawings denote the same reference numerals as possible whenever possible.

In the following description, specific details such as DVB-H digital broadcasting, time of burst channel, etc. are shown to provide a more general understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be readily practiced without these specific details and by modifications thereof.

An embodiment of the present invention relates to a digital broadcast receiver for displaying at least two service channel data selected by a user on a multi-screen, or a portable terminal having such a digital broadcast receiver. The digital broadcasting may be classified into a digital multimedia broadcasting (DMB) method, a digital video broadcasting (DVB) method, a media flow (forward link only), or the like. The DMB, DVB, and media flow methods all use digital broadcasting. In addition, the DVB scheme includes a DVB_T scheme and a DVB_H scheme, and the DVB_H scheme uses time slicing and IP-based broadcast signals. The digital broadcast receiver according to the embodiment of the present invention will be described by way of example as receiving and processing the broadcast signal of the DVB_H. However, the digital broadcast receiver according to the embodiment of the present invention can be applied to both the DVB method, the DMB method, and the media flow method.

 Hereinafter, terms used in the embodiments of the present invention are defined as follows. First, a "channel" refers to a frequency channel selected by a tuner, and a "service" is a channel of an actual broadcasting station transmitted on the selected channel. The service channel is classified by a program identifier or product identifier (PID). "Event" refers to programs provided by each service. In an embodiment of the present invention, the channel is used as a "physical channel" and the service is used as a "service channel" in order to prevent confusion caused by the use of the terms. In digital broadcasting, a plurality of service channels are transmitted in one physical channel, a physical channel means a channel frequency set in a tuner, and a service channel means broadcasting stations in the physical channel. The service channel may be distinguished by the PID in the case of DMB and DVB-T, and may be distinguished by a combination of PID, IP address, and / or port information in the case of DVB-H. "Multi-screen" means displaying data of two or more service channels on one display unit. In this case, the multi-screen may be represented in the form of a picture in picture (PIP). The "main service channel" refers to a service channel for transmitting main screen data displayed on the entire display unit in the multi-screen, and the "sub service channel" refers to the multi-screen. Means a service channel for transmitting slave (or sub screen) data displayed on a portion of the display unit. In the embodiment of the present invention, it is assumed that the broadcast signal of the main service channel is displayed in full frame when the multi-screen is displayed, and the broadcast signal of the secondary service channel only displays broadcast signals of a specific frame. Here, the specific frame video data is frame video data for decoding and may be frame video data encoded alone without reference to other frame data or frame video data encoded with reference to video data of another frame once. In this case, it is assumed that the specific frame is an I frame and / or a P frame broadcast signal. In the embodiment of the present invention described below, the primary service channel processes video and audio data, and the secondary service channel will be described on the assumption that it processes only video data.

1 is a diagram illustrating a structure of a digital broadcast receiver for changing a service channel according to an embodiment of the present invention.

Referring to FIG. 1, the controller 100 controls the overall operation of the digital broadcast receiver. The key input unit 170 generates key data according to a user's selection and applies the generated key data to the controller 100. Here, the user's command generated through the key input unit 170 may be a command for selecting and playing the primary and secondary service channels. In an embodiment of the present invention, the user may select primary and secondary service channels for displaying on a multi-screen before performing the broadcast play mode or during the broadcast play mode. When the main and sub service channels are selected, the controller 100 recognizes that the multi-screen display is performed, and processes the data of the selected main and sub service channels to display the multi-screen on the display unit 150. Accordingly, the controller 100 may be a multi-screen display control unit.

The memory 160 may include a program memory for storing a program for controlling the operation of the digital broadcast receiver, and a data memory for storing data generated during program execution. The program memory of the memory 160 may include a program for performing a multi-screen display operation when at least two service channels are selected according to an embodiment of the present invention.

The broadcast receiver 110 receives data of at least two service channels selected by a user under the control of the controller 100. The protocol processor 120 processes the protocol of the data of the service channels and separately outputs video data, audio data, and broadcast information data. In the DVB-H scheme, the protocol processor 120 processes protocols of the IP datagram to extract and output audio data, video data, and broadcast information data. In the DMB or DVB-H scheme, the protocol processor 120 demultiplexes audio and video data by analyzing a transport stream (TS). The decoder 130 includes an audio and video decoder.

The audio decoder decodes and outputs encoded audio data of a main service channel. The video decoder decodes and outputs video data of at least two service channels, respectively. In this case, the multi-screen processing unit 140 mixes the decoded video data and multiplexes the multi-screen processing so that the display unit 150 displays the multi-screen. The decoded video and audio data are respectively applied to the display unit 150 and the speaker 155 and reproduced.

In an embodiment of the present invention, when a user selects a primary and secondary service channel to set a multi-screen display function, the control unit 100 receives a physical channel for receiving the broadcast signal of the selected primary and secondary service channel to the broadcast receiver 110. While setting the frequency, the identifier PID of the primary and secondary service channel is set. Then, the broadcast receiver 110 receives a broadcast signal of the set physical channel frequency and receives a broadcast signal of a set main and sub service channel among the broadcast signals of the set physical channel frequency. Then, the protocol processor 120 processes a protocol of broadcast data of the received primary and secondary service channels, and the decoder 130 decodes broadcast data of the protocol processed primary and secondary service channels, and the multi-screen processor 140 The broadcast data of the decoded primary and secondary service channels are multi-screen processed and displayed on the display unit 150.

In the exemplary embodiment of the present invention, only video frame data set when displaying the broadcast data of the sub service channel on a multi screen is displayed. That is, for example, when the video frame rate is 30 frames, the digital broadcast receiver receives and decodes 30 frames of video data frames per second, and then displays them on the display unit 150. At this time, in the embodiment of the present invention, when the broadcast data of the sub service channel is displayed in multiple screens, the video data of some frames is processed without processing the video data of all frames. For example, one video data frame, every tenth (or fifth) video data frame, or an odd (or even) video data frame may be selected and displayed in one second. Therefore, in the multi-screen display method according to an embodiment of the present invention, the broadcast data display of the primary service channel processes and displays all video data frames, and the broadcast data display of the secondary service channel selects and displays some video data frames.

In this case, the encoded video data frame of the service channel may include an I frame (Infra frame), a P frame (Previous or Predicted frame) and a B frame (Bidirectional frame). Here, the I frame is a key frame and means a video data frame including all video data compressed and coded directly from a source in the same manner as JPEG. The P frame means a video data frame configured based on information of a previous key frame (here, the I frame). The B frame refers to a video data frame configured based on information of an I or P frame before and after. In this case, the I frame can be decoded by the corresponding video frame itself when decoding, the P frame can be decoded using the previous I frame, and the B frame is the previous I or P frame and the subsequent I or P frame. Can be decoded. Therefore, the capacity of the encoded video data frame has the order of I> P> B frame, and the picture quality has the order of I> P> B frame. The video data of the I, P, and B frames as described above are interlaced and transmitted in an appropriate form. For example, P frames may be interposed between I frames in a manner of I B B P B B P B B P B B I B B P --- and interleaved in such a manner that B frames are inserted between I / P frames. Therefore, when displaying the multi-screen, I frame of the sub service channel or video frame data of the I and P frames may be selected and displayed on the multi-screen.

In the following embodiment of the present invention, the received video frame data is composed of I, P, and B frame data, and the display data of the sub service channel in the multi-screen display may include I frame video data (or P frame video data). Will be explained.

In the following description, it is assumed that video data of the sub service channel is I frame video data. However, as described above, it may be I and P frames or video frames of specific positions (every even, every odd, every fifth, every tenth, etc.).

In this case, the protocol processor 120 and / or decoder 130 selects and processes video data of a specific frame when processing broadcast data of the sub service channel. That is, when the protocol processor 120 can distinguish that the received video data is I, P or B frame data, the decoder 130 is transmitted from the protocol processor 120 when decoding the video frame data of the secondary service channel. Only I frame video data can be decoded. However, when the I, P or B frame data cannot be distinguished by the protocol processor 120, the decoder 130 analyzes the received video frame data and decodes only the I frame data. Accordingly, the video decoder of the decoder 130 decodes and outputs only all video frame data of the main service channel and I frame video data of the sub service channel, and the multi-screen processor 140 decodes the main and sub service channels decoded by the decoder 130. Video data is processed on a multi-screen and displayed on the display unit 150.

The digital broadcast receiver may be configured in other forms according to the broadcast method. The digital broadcast receiver has a DMB and DVB scheme, and the DVB scheme includes a DVB-T and DVB_H scheme. In the DMB and DVB digital broadcast receivers, the received broadcast data has an MPEG2-TS structure, and the broadcast data of the MPEG2-TS structure is a packet stream, and each packet includes a packet header and a payload. The packet header includes PID information that is an identifier for identifying a service channel. Accordingly, the digital broadcast receiver can select a desired service channel using the PID information. In this case, the payload of each packet having an MPEG2-TS structure in the DMB and DVB-T digital broadcast receivers is filled with broadcast data, and the payload of each packet having an MPEG2-TS structure in the DVB_H digital broadcast receiver. Is filled with IP information and broadcast data. Accordingly, in the DVB_T and DMB schemes, the broadcast data demodulator may be configured as a demodulator for demodulating the service channel data and generating the MPEG-2 TS. It may be a demultiplexer for demultiplexing audio, video, and broadcast information data, and the decoder 130 may be configured as a video, audio, and broadcast information decoder to decode the data. In the DVB-H scheme, the broadcast data demodulator demodulates data of a received service channel and a PID filter for selecting data of a service channel selected by a user among the demodulated broadcast data, and the control unit 100. And demodulation controllers for controlling the operation of the demodulator and the tuner. The protocol processing unit 120 processes the protocol of the IP datagram output from the demodulation controller and outputs audio, video, and broadcast information data. The decoder 130 may be configured of a video, an audio, a broadcast information decoder, and the like, respectively, which are decoded.

As described above, the decoder 130 may include video, audio, and broadcast information decoders. However, in the embodiment of the present invention, it is assumed that the broadcast information decoder is provided in the controller 100. In this case, the broadcast information decoder may be implemented in software. The broadcast information may include broadcast program information, various image information related to broadcast, and also may be interactive information that viewers can participate in the broadcast. For example, the DMB broadcast information may include an EPG (Electronic Program Guide), and the DVB-H broadcast information may include an ESG (Electronic Service Guide).

In the following description of the embodiment of the present invention, it is assumed that the digital broadcast receiver uses the DVB-H method.

FIG. 2 is a diagram showing the configuration of the broadcast receiver 110 of the DVB-H digital broadcast receiver. FIG. 3 is a diagram showing the configuration of the protocol processing unit 120 of the DVB-H digital broadcast receiver. 4F illustrates an IP-based service channel data structure received by the DVB-H digital broadcast receiver. FIGS. 5A through 5D illustrate data of at least two service channels according to an embodiment of the present invention. It is a figure for explaining the procedure of processing by multiple screens.

First, referring to the DVB_H data mapping configuration of FIGS. 4A to 4F, the DVB_H data has an MPEG2-TS structure. In FIG. 4A, each TS packet has a size of 188 bytes, and may include a packet header of 4 baht and a payload of 184 bytes. Here, the packet header has packet sync and PID information. The PID may be used as information for identifying service channels and information for identifying a payload. FIG. 4B is a configuration of an MPE section that can be carried in the payload of FIG. 4A, wherein the MPE section includes a table identifier (table_ID), information for error correction of the received data (MPE-FEC), and time slicing of received data. It may be composed of information for. 4C shows an example of using IP V6 as the configuration of the IP datagram. The IP datagram includes an IP version (such as IP V6 or IP V4), source IP information, destination IP information, and the like. 4D is UDP and includes port information (Scr Prt, Dst Prt) of the calling and called party. 4E is a configuration of FLUTE / ARC and includes an Electronic Service Guide (ESG), files, and the like. 4F is an RTP configuration, in which audio and video data are included.

Secondly, referring to the time slicing and decoding process of video data of FIGS. 5A to 5D, as described above, in DVB-H, a plurality of service channels are transmitted on one physical channel, and each service channel is illustrated in FIG. 5A. As shown, time alignment, multiplexing, and transmission are performed. FIG. 5A assumes that 10 service channels ch1 to ch10 are transmitted to one physical channel, ch3 is selected as a primary service channel, and Ch8 is selected as a secondary service channel. The period of ch1-ch10 is called Δt, and is burst on ch3 and ch8 service channels, and the remaining service channel bursts are off time. Accordingly, the DVB-H supplies power so that the room transceiver 110 can operate only in the selected service channel using a time slicing technique as shown in FIG. 5B. As shown in FIG. 5B, burst data of ch3 and ch8 received as shown in FIG. 5B are simultaneously decoded in a Δt section as shown in FIGS. 5C and 5D. 5C illustrates an example of performing a decoding operation of a corresponding burst at the same time as receiving a burst. FIG. 5D illustrates an example of buffering a burst during Δt period after receiving burst data and simultaneously decoding the buffered bursts during a Δt interval. It is shown. Accordingly, the digital broadcast receiver according to the embodiment of the present invention simultaneously decodes data of the primary and secondary service channels in the interval Δt, and displays the decoded data on the display unit 150 in multiple screens.

Referring to FIG. 2, the broadcast reception 110 of each physical channel includes a tuner 200 and a broadcast data demodulator, and the broadcast data demodulator 210 includes an analog to digital converter 210, a demodulator 220, a PID filter 230, and demodulation. Controller 240 and the like. The tuner 200 is set to a physical channel frequency at which a service channel selected by a user is transmitted, and receives signals of service channels of the set physical channel. The tuner 200 is a PLL for generating a frequency for setting a physical channel, a mixer for outputting a broadcast signal of a physical channel set by mixing a received broadcast signal and a physical channel frequency generated in the PLL, and a set physical channel frequency band. And a bandpass filter for filtering and outputting a signal.

The demodulation controller 240 controls the tuner 200 according to the channel control data output to the control unit 100 to set the physical channel frequency of the selected service channel, and sets the PID of the selected primary and secondary service channels in the PID filter 230. To perform. At this time, the controller 100 analyzes the PSI / SI information output from the broadcast receiver 110 and SDP information included in the ESG (Electronin Service Guide) output from the protocol processor 120 to analyze PID, IP, and port information of service channels selected by the user. Check it. That is, if the PID filtered by the PID filter 230 is a network information table (NIT), a service description table (SDT), or an event information table (EIT), the controller 100 may use a physical channel and a service channel from the table (PSI / SI). You can check their PIDs. In addition, the controller 100 extracts and analyzes an SDP from the ESG data having the structure as shown in FIG. You can check them. Accordingly, the controller 100 analyzes the PSI / SI and / or SDP data to determine PID, IP, and port information for distinguishing each service channel and audio and video data of each service channel. When the user selects the service channels, the controller 100 outputs channel data for filtering the PID of the physical channel and the service channel that transmits the selected service channel data to the demodulation controller 240. In this case, when the user selects at least two service channels for the multi-screen display, the controller 100 outputs channel control data including the PIDs of the service channels to the demodulation controller 240. In this case, the at least two service channels may be a primary service channel and at least one secondary service channel. In the embodiment of the present invention, it will be described on the assumption that the data of the main service channel and one sub service channel are displayed on a multi-screen. In the following description, an example in which a main service channel and one sub service channel are selected and displayed on a multi-screen is described.

The demodulation controller 240 then sets the physical channel frequency for receiving the selected service channel in the tuner 200 and sets the PID of the primary and secondary selected service channels in the PID filter 230. Then, the tuner 200 receives a broadcast signal of the set physical channel frequency from the received broadcast signal. The A / D converter 210 receiving the output of the tuner 200 converts the output signal of the tuner 200 into digital data, and the demodulator 220 demodulates the modulated broadcast signal into original data. The demodulator 220 may be configured as an OFDM or COFDM demodulator. In this case, the data demodulated by the demodulator 220 may be a TS packet stream of MPEG2-TS as shown in FIG. 4A, and the TS packet includes PID information which is an identifier for identifying a service channel. The PID filter 230 filters the data as shown in FIG. 4 having PIDs of the primary and secondary service channels in the demodulated IP datagram, and transmits PSI / SI information to the controller 100. In addition, the data as shown in FIG. 4B output from the PID filter 230 may include MPE-FEC (MultiProtocol Encapsulation-Forward Error Correction) and time slicing information. The demodulation controller 240 then controls the time slicing of the received burst data if the data includes the information as shown in FIG. 4B. That is, the demodulation controller 240 controls the power supply of the tuner 110 and the demodulator 220 using the time slicing information of FIG. 4B. In this case, the time slicing information includes burst on time information of the primary and secondary service channels, and the demodulation controller 240 uses the time slicing information in the burst data period of the primary and secondary service channels. Power is supplied to the tuner 200 and the demodulator 220, and the power supply is stopped in other sections. In addition, the demodulation controller 240 performs MPE-FEC function on the data of the primary and secondary service channels output from the PID filter 230 using the MPE section information as shown in FIG. 4B.

As described above, the demodulation controller 240 controls the tuner 200 according to the channel control data output to the controller 100 to set the physical channel frequency of the selected service channel, and sets PID of the primary and secondary service channels in the PID filter 230. Perform the set function. And MPE-FEC function to control the operation of time slicing (time slicing) to reduce the power consumption of the digital broadcast receiver by the MPE section information as shown in FIG. Do this. In this case, the data output from the demodulation controller 240 may be an IP datagram having a structure as shown in FIG. 4C.

Accordingly, in the configuration of the broadcast receiver 100, the tuner 200 selects broadcast signals of a physical channel of a set service channel, and the demodulator 220 converts the output of the tuner 200 into digital data and demodulates (OFDM or COFDM). In this case, the demodulated data has an MPEG2 TS structure as shown in FIG. 4A and includes PID information for distinguishing service channels of the corresponding physical channel. The PID filter 230 analyzes the PID of the demodulated data to selectively filter demodulated data having the PSI / SI PID and the PIDs of the primary and secondary service channels. In this case, data having a PID of information related to the PID list such as the PSI / SI is transmitted to the controller 100, and broadcast information data including the ESG and the data of the primary and secondary service channels are transmitted to the demodulation controller 240. . The demodulation controller 240 then analyzes the MPE section data having the structure as shown in FIG.

3 shows an example of the configuration of the protocol processing unit 120 of the DVB_H digital broadcast receiver.

Referring to FIG. 3, the protocol processor 120 extracts video, audio, and broadcast information data after processing IP and protocol information of the received selected service channel data. The video decoder 500 decodes the video data output from the protocol processor 410 and outputs the decoded video data to the display unit 150. The audio decoder 590 decodes the audio data output from the protocol processor 410 and outputs the decoded audio data to the speaker 155. The broadcast information data is transmitted to the control unit 100 to be decoded.

The protocol processor 120 may include an IP extractor 310, a UDP extractor 320, a FLUTE transmitter 330, and an RTP transmitter 340.

Referring to the configuration of the protocol processing unit 120, the data of the selected service channel input to the IP decapsule module 310 is the IP information (source IP address, desination) of the transmitting side and the receiving side as shown in Figure 4c IP datagram containing the IP address. The IP extractor 310 extracts IP information by decapsulating the IP datagram. In addition, the UDP decapsule module 413 receives UDP information including a source port address & destination port address (Scr Prt & Dst Prt) as shown in FIG. 4D. The UDP extractor 320 extracts the port information. Thereafter, if the UDP-removed protocol data is FLUTE / ALC protocol data as shown in FIG. 4E, the received data is transmitted to a FLUTE file transfer module (FLUTE) module 330. If the RTP protocol is used, the RTP transmission unit (A / V) is used. transport (RTP / TRCP) module 340. In the case of the FLUTE / ALC protocol, the data may be data (XML, SDP, HTML, JPG, POL, etc.) consisting of an ESG or a file, and the ESG and file data are transmitted to the control unit 100 and decoded. . In the case of the RTP protocol, the data may be audio and video data. In this case, the RTP transmitter 340 may classify the I, P, and B frame data in the frames constituting the video data. The video and audio data processed by the RTP protocol are transmitted to the corresponding video decoder 500 and the audio decoder 590, respectively, and decoded.

In this case, the controller 100 processes the protocols processed by the protocol processor 120. That is, the controller 100 may include an ESG engine (XML engine and ESG decoder), an SDP parser, a PSI / SI decoder, and the like, and include controllers and managers of the protocol information. Can perform process control and management functions of the protocol. The controller 100 processes each protocol information and data extracted and transmitted by the protocol processor 120. That is, the controller 100 may analyze PSI / SI information (NIT, SDT, EIT) extracted from the broadcast receiver 110 to check PSI / SI according to MPEG-2 and DVB-SI standards. The overall operation of the digital broadcast receiver is controlled by parsing the SDP (main data set related to broadcasting) of the ESG data. At this time, the service channel, ESG, audio and video data of each service channel are identified by PID, IP information, and port information. That is, the PSI / SI and SDP include tables defining identifiers of the service channel, audio, video, and ESG identifier information of each service channel. Accordingly, the control unit 100 may distinguish a service channel and / or audio data and / or video data and / or ESG data with reference to the PSI / SI decoding result and the SDT. The controller 100 may include a protocol processor 120.

In addition, the controller 100 controls a path of the broadcast receiver 110 and the protocol processor 120. Most of the MPEG-TS streams and IP datagrams shown in FIGS. 4A-4F consist of audio and video data. That is, when one burst data is received, most of the data constituting the burst data are video and audio data. Therefore, after analyzing the data of the received service channel, the controller 100 drives the corresponding component according to the result, and performs the path controller function of controlling the remaining components to connect the path. That is, if the received data is the MPE section as shown in FIG. 4B, the controller 100 drives the demodulation controller 240 to receive burst information, and the demodulation controller 240 analyzes the MPE section data to time slice and MPE-FEC functions. To do this. If the received data is IP V6, the controller 100 processes the IP list extracted by driving the IP extractor 310. In addition, if the received data is UDP, the controller 100 processes the port list extracted by driving the UDP extractor 320. If the received data is FLUTE / ALC, the controller 100 drives the FLUTE transfer unit 330 to process the ESG and / or files received thereafter. If the received data is RTP, the controller 100 drives the RTP transmitter 340 to process the RTP, and then transfers the video and audio data to the video decoder 500 and the audio decoder 590, respectively. Therefore, the controller 100 analyzes the received data to enable the corresponding component and controls the remaining components to provide only a path. At this time, the components providing the path perform a function of bypassing the received data, and thus can quickly process the received data.

Although the demodulation controller of FIG. 2 and the protocol processor 120 shown in FIG. 3 are illustrated in a serial connection structure, they may be configured in parallel. That is, the components 240, 310, 320, 330, 340, and 350 may be connected in a parallel structure, and may be implemented as a structure for driving only the components corresponding to the received data. Each of the above components may be implemented in software. In this case, the controller 100 can quickly process the received data by driving a task that performs a corresponding function as necessary.

When the protocol processor 120 outputs video data and audio data, the video decoder 500 decodes the video data and displays the video data on the display unit 150. The audio decoder 590 decodes the audio data and reproduces the audio data on the speaker 155. In this case, the video decoding ratio 500 decodes the video data processing of the primary and secondary service channels differently when the multi-screen display function is set by the controller 100. That is, when the multi-screen display function is set, the video decoder 500 decodes and outputs all video frame data of the main service channel by a decoding control signal (VDTS or VPTS). However, when processing video frame data of the secondary service channel, the video decoder 500 decodes and outputs only the set video frame data (here, I frame data). The video decoder 500 may use an H.264 or MPEG decoder, and the audio decoder 590 may use an AAC decoder.

The digital broadcast receiver according to the embodiment of the present invention having the configuration as described above, when the user selects the primary and secondary broadcast service channels and sets the multi-screen display function, bursts of the selected primary and secondary service channels in one Δt interval, respectively Data is received and the received data is processed and displayed on the display unit 150 in multiple screens. At this time, the audio can reproduce one of the service channel audio data of the main service channel and the sub-service channel, it is assumed in the embodiment of the present invention to reproduce the audio data of the main service channel. If the multi-screen display function is provided as described above, the digital broadcast receiver may display at least two service channel screens on the display unit 150. When the user requests a channel change (that is, when a function change of the primary service channel and the secondary service channel is requested) while displaying the multi-screen as described above, the service channel can be changed immediately. In this case, the video decoder 500 of the decoder 130 performs all video frame data decoding of the changed main service channel (formerly sub-service channel), and decodes the set video frame data of the changed sub-service channel (formerly main service channel). Perform When the user changes the sub service channel to the main service channel and sets a new sub service channel, the digital broadcast receiver plays the changed main service channel data on the main screen and receives burst data of the newly set sub service channel. When the standby data is received and the burst data of the secondary service channel is received, the multi-screen display function can be performed again.

5A through 5D are diagrams for explaining a procedure of receiving and processing data of a primary and secondary service channel selected by a user in a digital broadcast receiver according to an embodiment of the present invention.

The DVB_H digital broadcast receiver uses a time slicing technique to reduce power consumption by supplying power only in a section in which broadcast data is received and in a section in which broadcast data of a selected service channel is not received. do. 5A is a diagram illustrating an example of receiving service channel data using a time slicing technique. FIG. 5A illustrates a case in which 10 service channels (CH1-CH10) are used for one physical channel, and the current user-selected primary service channel is CH3 and the secondary service channel is CH8. In this case, a section in which the CH3 and CH8 data are received is called a burst time, and the remaining sections CH1-CH2, CH4-CH7, and CH9-CH10 are called burst off times. As shown in FIG. 5A, data of each service channel is repeatedly transmitted in a predetermined order (here, CH1-CH10). As shown in FIG. 5A, the time from when a burst of a specific service channel is received until a next burst is called Δt. Accordingly, each service channel receives one burst in the Δt period. Δt is referred to as a burst reception period.

In this case, when CH3 and CH8 are selected as the primary service channel and the secondary service channel as shown in FIG. 5A, the demodulation controller 240 is connected to the tuner 200 and the demodulator 220 as shown in FIG. Supply power. Then, the tuner 110 receives burst data of the CH3 and CH8, and the demodulator 220 demodulates the received burst data and outputs it as a TS stream as shown in FIG. 4A. The PID filter 230 analyzes the packet header of the TS stram to filter and output service channel data of the CH3 and CH8, and the demodulation controller 240 performs error correction on the data of the CH3 and CH8. Thereafter, the protocol processor 130 extracts audio and video data while performing a protocol processing operation as shown in FIGS. 4C to 4F and decodes the video decoder 500 and the audio decoder 590, respectively. In this case, the audio decoder 590 decodes the audio data of the main service channel and reproduces the audio data through the speaker 155. The video decoder 500 decodes the burst data of the main and sub service channels in the Δt period. In this case, the video decoder 500 may decode data of the primary and secondary service channels, respectively, from a time point at which burst data is received to a time point at which next burst data is received, as shown in FIG. 5C. Burst data may be stored, and burst data received in a previous Δt interval may be decoded.

FIG. 6 is a diagram for describing a procedure of decoding and outputting burst data of a primary and a secondary service channel received for display on a multi-screen according to an embodiment of the present invention. 7A to 7G are diagrams illustrating timings of decoding data of a primary service channel and a secondary service channel in the video decoder 900. In this case, it is assumed that video data of the sub service channel processes only I frames or I frames and P frames.

7A to 7E, the video decoder 500 decodes video frame data of respective service channels in a frame period. In the frame period as shown in FIG. 7A, when only the I frame data of the sub service channel is processed, the video decoder decodes the video frame data of the main and sub service channels that are time-divided and input as shown in FIGS. 7B and 7C. When only the frame data is processed, the video frame data of the time-divided primary and secondary service channels as shown in FIGS. 7D and 7E are decoded. 7B to 7E illustrate an example in which the video decoder 500 analyzes the received video data and decodes the I frame or the I and P frame video data and displays them on a multi screen. FIGS. 7F to 7G illustrate a protocol processing unit. An example of splitting and transmitting the I, P, and B frames at 120 is shown. 7B to 7G illustrate an example of time division and displaying video data of a primary service channel and one sub service channel in a frame period.

First, the video data transferred from the protocol processor 130 is stored in the input buffer 520 of the primary service channel and the input buffer 525 of the secondary service channel, respectively. In this case, data of the primary and secondary service channels stored in the input buffers 520 and 525 may be stored in units of frames. Here, MBF means coded video frame data of a main service channel, SBF means coded video frame data of a sub-service channel, MDBF means frame data of a decoded main service channel, and SDBF is a decoded sub It means frame data of service channel. Therefore, since MBF and SBF are encoded data, they have a relatively small size compared to the MDBF and SDBF. Accordingly, the encoded frame data stored in the input buffers 520 and 525 has a smaller size than the decoded video frame data stored in the output buffers 540 and 545. The encoded video data may be I, P or B frame video data.

The decoding control of the video data is performed by a video decoding control signal. That is, the decoding control signal includes a decoding time stamp (DTS) and a presentation time stamp (PTS). The DTS is a signal (decoding start signal) for controlling the time point at which video frame data is decoded by the video decoder 510 as described above. The PTS transmits the video data stored in the output buffer after completion of video decoding to the display unit 150. It is a signal (display control signal) for controlling the point of time. Therefore, when the DTS signal is used, the video decoder 510 decodes the encoded video frame data of the input buffers 520 and 525 by the DTS signal, and the decoded video frame data is displayed on the output buffers 540 and 545. Is displayed. In this case, the input buffer 520 storing the encoded video frame data of the main service channel should be configured with a size capable of storing a plurality of video frame data (video data of the maximum burst data size). The input buffer 525 storing encoded video frame data of the sub service channel may have a different size according to the processing result of the protocol processor 120. That is, when the protocol processor 120 does not classify and transmit the I, P, and B frames of the video data, the input buffer 525 is set to the same size as the input buffer 520 as shown in FIGS. 7B and 7D. Can be. However, when the protocol processor 120 classifies and transmits the video data into I, P, and B frames, the input buffer 525 is set to a size that can store only video data of an I frame or I and P frames to be displayed in a multi-screen. Just do it.

The output buffers 540 and 545 can be composed of small size video data (minimum 1 frame size). That is, the decoder 510 generates video data decoded to a video frame size, and the decoding decodes the video data of the primary and secondary service channels or only the video data of the primary service channel in one frame period. In this case, the output buffer 540 buffers the decoded video data in every video frame section, and the output buffer 545 stores the decoded video data at the time point at which the video data of the I frame or the I and P frames are decoded. In this case, the display unit 150 displays decoded video data stored in the output buffers 540 and 545. When using the DTS signal, the display unit 150 accesses and displays decoded video frame data stored in the output buffers 540 and 545 immediately. Therefore, the output buffers 540 and 545 may be set to a size larger than that can store video data of one frame.

In addition, when the PTS is used, the video decoder 510 decodes the encoded video frame data stored in the input buffers 520 and 525 and outputs the decoded video frame data to the output buffers 540 and 545. The buffered coded data is transferred to the display unit 150. In this case, the input buffers 520 and 525 may be configured to store a small number of video frame data, and the output buffers 540 and 545 should configure a buffer size according to the PTS signal. That is, when the PTS is used, the output buffers 540 and 545 store the decoded video frame data, and the output buffers 540 and 545 transmit the decoded video data to the display unit 150 by the PTS. This should be set to a buffer with a relatively large size.

In the embodiment of the present invention, it is assumed that the DTS signal is used, and it is assumed that the output buffers 540 and 545 have a size for storing decoded video frame data. In addition, it is assumed that the protocol processor 120 transfers all video frame data of the primary and secondary service channels to the video decoder 500.

The selection signal Sel1 of the multiplexer 530 is a signal synchronized with the DTS signal and is a signal for selecting video frame data of the primary service channel and the secondary service channel at one frame interval. In this case, the selection signal Sel1 may be configured as a 1-bit signal when the number of multiple screens is two, and may be configured as a 2-bit signal when four or less, and as a three-bit signal when eight or less. The selection signal Sel1 may be generated in a different form depending on whether the protocol processor 120 classifies and transmits I, P, and B frame video data. That is, when the protocol transmitter 120 does not classify and transmit I, P, and B frame video data, the multiplexer 530 must multiplex video data of all frames of the primary and secondary service channels and transmit the multiplexed video data to the decoder 510. However, when the protocol transmitter 120 classifies and delivers I, P, and B frame video data, the multiplexer 530 must deliver video frame data of all frames of the primary service channel to the decoder 510. Video data of I frame or I and P frame should be delivered to decoder 510. Accordingly, in the former case, the selection signal Sel1 is generated as a control signal for multiplexing the video data of the primary and secondary service channels in each frame period, as shown in 7b and 7d. In the latter case, the selection signal Sel1 generates a control signal for multiplexing the video data of the primary and secondary service channels in a frame (in this case, I frame or I and P frame) that decodes the video data of the secondary service channel, such as 7g. It is generated as a signal for selecting video data of the primary service channel in a frame period (here, B and P frames or B frames) in which video data of the secondary service channel is not decoded. 7A to 7G illustrate an example of displaying video data of a main service channel and one sub service channel on a multi screen. In this case, the multiplexed selection signal Sel1 is generated as a 1-bit signal.

First, referring to FIGS. 7A to 7E, a decoding operation of video data according to an exemplary embodiment of the present invention will be described. The multiplexer 530 may be configured in the first half period of one frame period by the multiplex selection signal Sel1 as shown in 7b and 7d. The video data of the primary service channel buffered in the input buffer 520 is selected and transmitted to the decoder 510. In the second half period, the video data of the secondary service channel buffered in the input buffer 525 is selected and transmitted to the decoder 510. In this case, the selection signal Sel2 of the demultiplexer 535 is a signal corresponding to the selection signal Sel1 of the multiplexer 530. When the main service channel video data is selected by the multiplexer 530, the data of the secondary service channel decoded by the decoder 510 is selected. When the sub-service channel video data is selected by the multiplexer 530, the demultiplexer 535 controls the de-multiplexer 535 to select the data of the main service channel decoded by the decoder 510 and transmit the data to the output buffer 540.

As described above, the multiplexer 530 is time-division multiplexed and outputs the frame data of the primary and secondary service channels as shown in FIGS. 7b and 7d in the frame section as shown in FIG. Decode video frame data of the primary and secondary service channels, respectively. In this case, the decoder 510 decodes or omits decoding of the corresponding frame video data according to the frame type of the video data. That is, in the multi-screen display, the decoder 510 decodes only video data of a frame set among video data of the sub service channel, and does not decode video data of the remaining frames. In this case, the frame determination of the video data may be performed by the controller 100, the decoder 510, or may be performed by the protocol processor 120. In the following description, the decoder 510 selects and decodes I frame (or I and P frame) video data of a sub service channel received under the control of the controller 100, and the multi-screen includes a main service channel and one sub service channel. An example consisting of video data will be described.

The time division operation of the multiplexer 530 in the frame period determines the decoding time of the primary service channel and the secondary service channel within a frame period. In this case, when the service channels for realizing the multi-screen are the main service channel and one sub service channel, the multiplexer 530 performs frame data of the main service channel stored in the input buffer 520 during the first half of the frame period. Select and transfer the frame data of the sub-service channel stored in the input buffer 525 to the decoder 510 during the latter period. The decoder 510 decodes only I frame video data of video data of a sub-service channel under the control of the controller 100. The decoder 510 may know the frame type of the received video data. The decoder 510 decodes the received video data according to the identified frame type. That is, the decoder 510 decodes the received video data without performing motion compensation in the case of an I frame according to the frame type of the received video data, and in the case of the P frame video data, receives the data using the previous I frame data. Compensating for the movement of the video data, and in the case of the B frame to compensate for the movement of the video data using the video data of the previous I or P frame and the subsequent I or P frame. In this case, the decoder 510 decodes all I, P, and B frame video data of the main service channel when decoding the video data of the main service channel, and decodes video data of the sub service channel. Decode only I frame video data. At this time, the determination of the primary and secondary service channel can be confirmed through the multiplexed selected signal Sel1 applied to the multiplexer 530. A control signal can be generated to decode. That is, the control unit 100 enables the decoding operation of the decoder 510 in the section for decoding the video data of the main service channel, and only in the section in which the I-frame video data is multiplexed in the section for decoding the sub-service channel video data. In a section in which the decoding operation of the decoder 510 is enabled and video data of another sub service channel is multiplexed, a control signal for disabling the decoding operation of the decoder 510 may be generated.

Therefore, the decoder 510 decodes the frame data of the main service channel in the first half period of each frame as shown in FIG. 7B, and decodes the I frame data of the sub service channel in the second half period. In this case, since the decoder 510 is disabled in the section where the P and B frame data of the sub service channel are received, the decoded data cannot be generated. In this case, the control unit 100 generates a demultiplexing selection signal Sel2 for controlling the demultiplexer 535 as shown in FIG. 7C and transmits the output of the decoder 510 to the output buffers 540 and 545. In this case, as shown in FIG. 7C, the demultiplexing selection signal Sel2 outputs the video data of the primary and secondary service channels to the output buffers 540 and 545 in the frame section in which the I frame video data of the secondary service channel is decoded. In addition, other frame sections (ie, P and B frame sections of the sub service channel) may be generated as signals for outputting video data of the main service channel.

In addition, I and P frame video data of the sub service channel may be displayed in a multi-screen. In this case, the multiplexer 530 multiplexes the video data of the primary and secondary service channels in each frame section and delivers the same to the decoder 510 as shown in FIG. 7D. The decoder 510 decodes video data of all frames of the primary service channel and video data of I and P frames of the secondary service channel in a similar manner to the above. Thereafter, the demultiplexer 535 demultiplexes the video data of the primary and secondary service channels, which are decoded and output from the decoder 510, as shown in FIG. 7E and delivers the demultiplexed video signals to the output buffers 540 and 545, respectively.

As described above, when the protocol processor 120 classifies and delivers I, P, and B frame video data of the sub service channel, the controller 100 detects this and transmits the multiplexed selection signal Sel1 and inverse as shown in FIGS. 7F and 7G. The multiplexed selection signal Sel2 can be generated. That is, the controller 100 controls the multiplexer 530 to select and multiplex all video data of the primary service channel and I frame (or I and P frame) data of the secondary service channel as shown in FIG. 7F. By controlling the neutralizer 535, as shown in FIG. 7G, all video data of the primary service channel and I frame (or I and P frame) data of the secondary service channel may be demultiplexed and transferred to the corresponding output buffers 540 and 545, respectively. have.

In this case, a decoding start time (DTS) or a presentation time stamp (PTS) is determined for the encoded video frame data. That is, since the video frame data is data to be displayed in real time, the times to be displayed of the respective frame data are respectively determined. Therefore, when the DTS is used, the input buffers 520 and 525 accumulate and store frame data of the received primary and secondary service channels, and the multiplexer 530 stores the input buffers 520 and 525 in the DTS time. The corresponding video frame data is applied to the decoder 510, the decoder 510 decodes the transmitted video frame data, and the demultiplexer 515 buffers them in the output buffers 540 and 545, respectively. The buffering data is applied to the multi-screen processing unit 140, synthesized, and then displayed on the display unit 150 as a multi-screen. Therefore, when the video data is decoded according to the DTS, the data stored in the input buffers 520 and 525 are displayed immediately after decoding at the time determined by the DTS, so that the output buffers 540 and 545 use a buffer having a small size. Can be implemented.

In addition, when the PTS is used, frame data of the received primary and secondary service channels are stored in the input buffers 520 and 525, and the multiplexer 530 stores corresponding video frame data stored in the input buffers 520 and 525. The decoder 510 decodes the transmitted video frame data, and the demultiplexer 515 buffers them in the output buffers 540 and 545, respectively. Thereafter, the video frame data stored in the output buffers 540 and 545 are accessed and applied to the multi-screen processor 140 at the PTS time, and the multi-screen processor 140 synthesizes the video data of the received primary and secondary service channels. The display unit 150 displays multiple screens. Therefore, the PTS decoding immediately decodes the received video data and buffers it in the output buffers 540 and 545. The output buffers 540 and 545 have a relatively large size by outputting and displaying corresponding buffering data at the PTS time. Can be implemented using a buffer

6, after the video decoder 500 receives burst data of the primary and secondary service channels, the video decoder 500 decodes the video data included in each burst in units of frames, and divides one frame section when decoding the frame data. The frame data of the primary and secondary service channels are decoded in the divided frame periods, respectively. Therefore, frame data of the primary and secondary service channels can be decoded in one frame period. Therefore, the decoder 510 should have a capability of decoding frame data of two service channels in one frame period. The decoder 510 may be an MPEG4 decoder or an H.264 decoder.

In addition to the above method, video data of the primary and secondary service channels may be divided and decoded in burst units. That is, the period Δt may be divided into a first half period and a second half period, and the data of the main service channel may be decoded in the first half period of the Δt period and the data of the sub-service channel may be decoded in the second half period of the Δt period. . In this case, the display of the data may be delayed by Δt interval, and the size of the buffer that buffers the video data should be set larger than when decoding in units of frames.

As described above, the decoded video data output from the video decoder 500 becomes data of the primary and secondary service channels. As described above, the video data of the main service channel may be displayed on a full screen of the display unit 150, and the video data of the sub service channel may be displayed on a screen (PIP) occupying a partial area of the display unit 150. In this case, when the video data of the sub service channel is displayed as a PIP, the video data of the sub service channel may be processed as it is, or may be processed by resizing. In this case, the resizing of the frame data may be performed by the video decoder 500 or may be processed by the multi-screen processor 140. In this case, when the video decoder 500 resizes the video data of the sub service channel, the video decoder 500 may use the video decoder disclosed in Patent Application No. 2004-85860 filed by the applicant of the present application. When displaying on the multiple screens, the screen of the display unit 150 may be divided to display video data of the main service channel and the sub service channel in the same size, and a partial area of the entire screen on which the main service channel data is displayed. Video data of the sub service channel may be displayed in the. The sub service channel screen may be fixedly displayed at a specific display position of the display unit 150 and may be displayed at a position of the display unit 150 set by a user.

8A to 8C are diagrams illustrating the configuration of the multi-screen processing unit 140 according to an embodiment of the present invention. 8A to 8C, the primary service channel output buffer 610 may be an output buffer 540 of the primary service channel of FIG. 6, and the secondary service channel output buffers 611 to 61n are output buffers 545 of the secondary service channel of FIG. 6. Can be That is, the output buffers 610-61n of the multi-screen processor 140 may use the output buffers 540 and 645 of the video decoder 500.

8A illustrates a configuration in which the video decoder 500 inputs full data that resizes or does not resize video data of a secondary service channel and displays data of the secondary service channel at a fixed position of the display unit 150. It is shown. FIG. 8B illustrates a case in which video data of a sub service channel output from the video decoder 500 is resized to a size set by a user or a preset size, and the data of the sub service channel is displayed at a fixed position of the display unit 150. It is shown. 8C illustrates a case in which video data of a sub service channel output from the video decoder 500 is resized to a size set by a user or a preset size, and the data of the sub service channel is displayed at a position of the display unit 150 set by a user. The configuration of the is shown. 8A to 8C illustrate an example in which output buffers 611 to 61N of a plurality of sub service channels are configured. In the following description, an output buffer 611 of one sub service channel is used. It will be explained on the assumption.

At this time, when the multi-screen display, the display position of the screen for displaying the broadcast data of the main service channel displayed on the display unit 150 and the screen for displaying the broadcast data of the sub-service channel should be set in advance. For example, in the case of displaying in the PIP form of the multi-screen, the PIP screen (hereinafter assumed to be the screen of the sub-service channel) should be displayed in the set size at the set position of the full screen (hereinafter, assumed to be the screen of the main service channel). do. In this case, the display position and / or the screen size of the sub service channel may be set by the user or may be displayed as a fixed screen size at a fixed display position. When the display position and size of the PIP screen are determined as described above, the controller 100 controls the mixer 620 to control the display of the broadcast data of the primary and secondary service channels on a frame-by-frame basis to display the multi-screen. Make sure For example, it is assumed that one screen displayed on the display unit 150 is 1600 * 900 pixels (when the number of pixels of one line is 1600 pixels and one screen is 900 lines). The position and size of the PIP screen displayed on the screen are assumed to be the area where the 801th to 1600th pixels of the 451-900 lines are displayed. When the pixel data is transferred to the display unit 150, the control unit 100 first generates the screen display control signal so that broadcast data of the main service channel is selectively output in the region where the pixel data of the first line to the 450 line is displayed. Secondly, when selectively outputting the pixel data of the 451-900 lines, the screen display control signal is generated so that the broadcasting data of the main service channel is selectively output in the region where the first pixel-the 800th pixel data are displayed. The screen display control signal is generated so that broadcast data of the sub service channel is selectively output in an area where the 801th to 1600th pixel data are displayed. As described above, the screen display control signal (mdc) output from the controller 100 to the mixer 620 is generated as a control signal for selecting broadcast data stored in the main service channel output buffer 610 in the area where the main screen is displayed. In the area where the PIP screen is displayed, a control signal for selecting broadcast data stored in the sub service channel output buffer 611 is generated. Therefore, the mixing unit 620 selects the outputs of the main service channel output buffer 610 and the sub service channel output buffer 611 according to the display control signal output from the control unit 100, and outputs them to the display unit 150. The broadcast data of the main service channel is output to the area displayed on the screen, and the broadcast data of the sub service channel is output to the area displayed on the PIP screen.

In this case, the mixing unit 620 may be implemented as a multiplexer, or may be implemented as a blending unit.

First, when the mixer 620 is configured as a multiplexer, the controller 100 multiplexes and outputs broadcast data of primary and secondary service channels corresponding to the main screen and the PIP screen display area displayed on the display unit 150 as described above. . That is, the multiplexer outputs the video data of the main service channel to the display unit 150 in the main screen display area of the display unit 150 by the screen display control signal, and selects and outputs the video data of the sub service channel in the set PIP area. do. In this case, since the data of the sub-service channel are multiplexed and output in the area to be displayed on the PIP screen, the display unit 150 displays the video data of the sub-service channel in a partial area of the entire screen on which the main service channel data is displayed. Done.

In addition, when the mixer 620 is configured as a blending unit, a weight value of the video data of the main service channel and the video data of the sub service channel should be set at the position where the video data of the sub service channel is displayed. That is, if the weight is set to overwrite the data of the secondary service channel (that is, the weight of the primary service channel 0, the weight of the secondary service channel 1), the PIP region set in the entire screen area in which the primary service channel is displayed The secondary service channel data is displayed on the screen. When the weight of the sub service channel is set higher than the weight of the main service channel, video data of the main service channel is overlaid and displayed in an area of the display unit 150 in which the sub service channel is displayed.

First, referring to FIG. 8A, the main service channel output buffer 610 stores video data of a main service channel decoded by the video decoder 500, and the sub service channel output buffer 611 is a sub service channel decoded by the video decoder 500. The video data. In this case, the multi-screen processing unit 140 having the configuration as shown in FIG. 8A is a case where the display position and size of the PIP screen displaying the broadcast data of the sub service channel are preset in the display unit 150. In this case, the user cannot change the display position and size of the PIP screen. Therefore, the mixing unit 620 outputs the video data of the main service channel stored in the main service channel output buffer 610 to the display unit 150 under the control of the control unit 100, and the sub service channel stored in the sub service channel output buffer 611 at the set position. Output video data.

Secondly, referring to FIG. 8B, as described above, the main service channel output buffer 610 stores video data of the main service channel decoded by the video decoder 500, and the sub service channel output buffer 611 is stored in the video decoder 500. Stores video data of the decoded secondary service channel. Here, the multi-screen processing unit 140 having the configuration as shown in FIG. 8B may adjust the size of the PIP screen displaying the broadcast data of the sub service channel, and the position where the PIP screen is displayed is set in advance on the display unit 150. . In this case, the user may adjust the size of the PIP screen displayed, but cannot change the position of the display unit 150 on which the PIP screen is displayed.

As described above, the size of the broadcast data stored in the sub-service channel output buffer 611 may be adjusted when displayed on the display unit 150. In this case, the broadcast data of the sub service channel may be resized during decoding by the decoder 510, and may not be resized. 8B illustrates that the decoder 510 resizes the data of the subservice channel output buffer 611 to match the size of the displayed screen without resizing the data of the subservice channel during decoding. The resizing of the broadcast data of the sub service channel may be determined by a user's selection, and may also be determined by a predetermined fixed size. That is, when the user of the digital broadcast receiver selects the multi-screen display function, the user may set the broadcast screen size of the sub service channel and may not set it. In this case, the controller 100 determines the resizing ratio of the broadcast data of the sub-service channel set by the user according to the user's setting, or determines the resizing ratio of the fixed display screen size. This resizing ratio is set in the resizer 631. The resizer 631 may use a scaler. In this case, the scaler may periodically remove pixels from all pixels of the broadcast data of the sub service channel according to a resizing ratio to maintain the entire screen form of the sub service channel. In addition, the scaler may select and display pixels of a specific area according to a size to be resized in all pixels of broadcast data of a sub-service channel. In this case, the display form of the sub service channel may display only pixels of a partial region in the full screen region.

The mixer 620 outputs the video data of the main service channel stored in the main service channel output buffer 610 to the display unit 150 under the control of the control unit 100, and the sub-service channel stored in the sub-service channel output buffer 611 at the set position. Output video data. In this case, the mixing unit 620 may be implemented as a multiplexer as described above, and may also be implemented as a blending unit.

Thirdly, referring to FIG. 8C, the user may adjust the size and display position of the PIP screen displayed on the display unit 150. As described above, the main service channel output buffer 610 stores video data of the main service channel decoded by the video decoder 500, and the sub service channel output buffer 611 stores video data of the sub service channel decoded by the video decoder 500. do. The resizer 631 resizes the broadcast data of the sub-service channel stored in the sub-service channel output buffer 611 to the display screen size as described above.

In this case, the broadcast data of the sub-service channel may be fixedly displayed in a specific area of the display unit 150 and may also be displayed at the position of the display unit 150 determined by the user's selection. In this case, the controller 100 may control the positioning unit 641 to determine a display position for displaying broadcast data of the sub-service channel. That is, the user of the digital broadcast receiver may set the screen display position of the sub-service channel when the multi-screen display function is set, or may not set it. In this case, when the user of the digital broadcast receiver sets the display position, the controller 100 controls the positioning unit 641 to control the output of the broadcast data of the sub-service channel. In this case, the output control is a display position of the display unit 150 determined by the user. In addition, when the user of the digital broadcast receiver does not set the display position, the controller 100 controls the positioning unit 641 to output broadcast data of the subservice channel to a preset position (fixed subservice channel display position). .

The mixer 620 outputs the video data of the main service channel stored in the main service channel output buffer 610 to the display unit 150 under the control of the control unit 100, and the sub-service channel stored in the sub-service channel output buffer 611 at the set position. Output video data. In this case, the mixing unit 620 may be implemented as a multiplexer as described above, and may also be implemented as a blending unit.

8C illustrates a structure in which the resizer 631 and the positioning unit 641 are connected to the output terminal of the sub-service channel output buffer 611. In this case, the controller 100 may variably determine the display screen size and the display positions of the sub-service channel by controlling the resizer 631 and the positioning unit 641 according to a user's selection. Therefore, when the multi-screen processing unit 140 is configured as shown in FIG. 8C, the broadcast data of the sub service channel is set (or preset) by the user on the display unit 150 while the broadcast screen of the main service channel is displayed. And at the display position.

Here, the resizer 631 and the positioning unit 641 may be interchanged with each other. That is, the position of the screen on which the broadcast data of the sub-service channel is to be displayed is first determined by the positioning unit 641, and the size of the sub-service channel broadcast data outputted from the determined display position is determined by the resizer 631. The display unit 150 may be resized and output to the display unit 150.

8C illustrates a configuration of the multi-screen processing unit 140 including both the resizer 631 and the positioning unit 641. However, the configuration of the resizer 631 may be omitted in FIG. 8C. In this case, the size of the screen displaying the broadcast data of the sub-service channel is fixed according to a preset resizing ratio, and the display position of the display unit 150 on which the broadcast data of the sub-service channel is displayed depends on whether the display position is set by the user. Variable.

8A to 8C, the case of one sub-service channel is assumed. However, the same may be applied to the case where two or more sub-service channels are provided.

In addition, when the video data of the main and sub service channels are displayed on the display unit 150 in multiple screens, the screen of the display unit 150 may be divided to display the video data of the main service channel and the sub service channel in the same size. In this case, a resizer for resizing video data of the main service channel may be used. That is, the resizers of the primary and secondary service channels may be provided, respectively, and the resized video data may be displayed on the screen area of the display unit 150. In addition, when the video data of the main service channel is not displayed on the entire screen of the display unit 150 (that is, even if the screen size of the main service channel is different from that of the sub service channel, the screen size of the main service channel is displayed on the display unit). Even if the full screen size of the () is not), a resizer for resizing the video data of the main service channel may be used.

The multi-screen display function of the digital broadcast receiver may provide a plurality of broadcast screens to the user, and thus the user of the digital broadcast receiver may watch two or more service channel broadcast screens.

In addition, the multi-screen display function of the digital broadcast receiver can be used for the channel search function. That is, when the user wants to switch to another service channel while watching any other service channel, the user selects the sub service channel to select the multi-screen display function. Then, the digital broadcast receiver displays the two broadcast screens on the display unit 150 by performing the multi-screen display function. The user of the digital broadcast receiver can check the broadcast of another service channel reproduced on the PIP screen while changing the sub service channel. When the user generates a channel switching command while viewing the multi-screen as described above, the control unit 100 of the digital broadcasting receiver can change the sub service channel to the main service channel, and thus the other service on the display unit 150. The broadcast screen of the channel can be switched to the main broadcast screen.

The multi-screen display procedure of the digital broadcast receiver according to the embodiment of the present invention having the above configuration will be described. 9 is a flowchart illustrating a procedure of displaying broadcast data of a primary service channel and at least one subservice channel in a multi-screen by a digital broadcast receiver according to an embodiment of the present invention.

Referring to FIG. 9, when a user requests a multi-screen processing function, the controller 100 displays a main screen of a multi-screen (broadcast data display screen of a main service channel) and at least one sub-screen (broadcast data of a sub-service channel). Screen, PIP screen) guides the input of the main service channel and the sub-service channel. At this time, the input of the primary and secondary service channels may be the number of the corresponding service channel. In this case, when the selection information of the main service channel is received, the controller 100 sets information of the main service channel in step 711. At this time, the information of the primary service channel may be PID, IP and port information. As described above, the PID information may be determined by analyzing PSI / SI information received through the broadcast receiver 110, and the IP and port information may be confirmed using SDP information of the ESG.

Thereafter, the controller 100 may display information for selecting a sub service channel on the display unit 150. In this case, the information that can be displayed may be a number of the sub service channel, frame selection information to be displayed in the broadcast data of the sub service channel, a display screen size of the sub service channel, and / or a display position of the sub service channel. In this case, the frame selection information of the sub service channel is information for selecting the frame video data to be displayed on the sub screen from the broadcast data of the sub service channel, and may be, for example, I frame, I and P frame. The frame selection information may be set to a specific frame number in frames displayed for one second. For example, when 30 frame video data is displayed in 1 second, the frame selection information may be set to a frame video data number such as every 10th, 20th, etc. among the frames displayed for 1 second. If the user does not select the frame selection information in the process of selecting the information for selecting the sub service channel, the controller 100 may set a preset frame (eg, an I frame) as the frame selection information. The controller 100 determines the sub service channel according to the information of the sub service channel input in step 713. At this time, when the number of the sub-service channel is input, the controller 100 sets PID, IP and port information of the selected sub-service channel using the PSI / SI and SDP information as described above. When the frame selection information is selected, the controller 100 controls the multiplexing, decoding, and demultiplexing operations of the video decoder 500 to set control signals for selecting frame video data of the selected sub service channel. When the information for selecting the display screen size of the sub-service channel is input, the controller 100 checks the size of the display screen and sets a resizing ratio to the decoder 130 or the multi-screen processor 140. In the following description, it is assumed that the resizing function of the sub service channel is performed by the multi-screen processor 140. If the display screen size of the sub-service channel is not selected, the preset resizing ratio is set. In addition, when the information for selecting the display position of the sub-service channel is input, the controller 100 sets the screen display position of the sub-service channel to the multi-screen processing unit 140, and if the selection information is not input, the controller 100 is set in advance. Set to the display position.

After selecting the primary and secondary service channels through steps 711 and 713, the controller 100 checks the PID and burst positions of the primary and secondary service channels, and then checks the demodulation controller 240 of the broadcast receiver 110. Provides PID and burst location information. Then, the demodulation controller 240 controls the time slicing so that power is supplied to the demodulator 220 in the burst reception periods of the primary and secondary service channels. As a result, the demodulator 220 receives and demodulates the bursts of the primary and secondary service channels. In this case, the demodulated signal has a TS stream structure as shown in FIG. 4A. In addition, the demodulation controller 240 sets PIDs of the primary and secondary service channels in the PID filter 230, and the PID filter 230 checks the PID at the output of the demodulator 220 as shown in FIG. Output broadcast data of a service channel. The demodulation controller 240 then MPE-FEC corrects the broadcast data of the primary and secondary service channels to generate an IP datagram as shown in FIG. 4C.

In this case, when the broadcast data of the primary and secondary service channels are received as described above, the controller 110 detects this in step 715 and decodes the received broadcast data in step 717. At this time, the data input during decoding are burst data of the primary and secondary service channels, and the burst data is composed of a large number of frame data. According to an embodiment of the present invention, the data stored in the input buffers 520 and 525 of the primary and secondary service channels of FIG. 6 are burst data, and the decoder 510 decodes the burst data in units of frames. 7b to 7g, frame data of the primary and secondary service channels are decoded in one frame period. In this case, the video decoder 500 decodes the video data of the main service channel and transmits the video data of the main service channel to the multi-screen processor 140, and the video data of the sub-service channel decodes only the video data of the set frame. To pass on. That is, when the set frame video data of the sub service channel is received, the video decoder 500 decodes the frame video data of the main service channel by time-dividing the corresponding frame section, and then decodes the frame video data of the sub service channel. The image is transmitted to the multi-screen processor 1430. If the frame video data of the sub service channel is unset frame video data, the video decoder 500 decodes only the frame video data of the main service channel in the corresponding frame section and transmits the decoded video data to the multi-screen processor 1430.

In this case, when the main service channel and one sub service channel are set, the decoding decodes the frame data of the main service channel in the first half of the frame and the frame data of the sub service channel in the second half of the frame. If two sub-service channels of the main service channel are configured, the decoding divides the frame period into 3 parts, decodes the frame data of the main service channel in the first section, and then sub-services in the second and third sections, respectively. Decode the frame data of the channels. Therefore, the decoder 510 must have a decoding rate capable of decoding frame data of the primary service channel and at least one sub service channel in a frame period.

FIG. 10 is a flowchart illustrating an operation procedure of a decoding process in step 717 of FIG. 9. FIG. 10 illustrates an operation procedure in which video and audio data of a primary service channel are displayed and video data of a subservice channel is displayed. In this case, the decoding procedure performed in step 717 of FIG. 9 decodes both audio and video data in the case of the main service channel, and decodes only video data of a set frame in the case of the sub-service channel. In the following description, it is assumed that multiple screens of the primary service channel and one sub service channel are displayed as described above.

Referring to FIG. 10, in the digital broadcast receiver, decoding performs broadcasting data, audio data decoding, video data decoding, and the like. When the broadcast data is received, the controller 100 checks whether the received broadcast data is burst data of the main service channel or burst data of the sub-service channel. After the audio and video data are separated from the burst data, the video data is stored in the input buffer 520 of the main service channel, and the audio data is stored in the audio data input buffer (not shown). The burst data of the secondary service channel separates audio and video data from the received burst data, and stores the video data in the input buffer 525 of the secondary service channel. In this case, when the protocol processor 120 classifies the type of frame video data of the sub service channel, the controller 100 selects the video data of a set frame from among the frame video data of the classified sub service channel and inputs the data. Can be stored in buffer 525. However, if the protocol processor 120 does not classify the frame video data types of the broadcast sub service channel, the video data of the sub service channel are all stored in the input buffer 525.

Thereafter, the controller 100 decodes the audio and video data stored in the input buffers 520 and 525 through the audio decoder 590 and the video decoder 500, respectively. In this case, the audio and video data are encoded data, and the controller 100 knows time information to be decoded of the data (for example, V-DTS (A-DTS) is decoding start time information of video (audio) data). , V-PTS (A-PTS) is output time information of decoded video (audio) data, and thus, the time of decoding video (or audio) data or the time of displaying decoded data using these time stamps. Therefore, the control unit 100 may control the decoding time of the video and audio data stored in the input buffers 520 and 525 and the audio input buffer (not shown) by using the time information.

First, referring to the decoding process of the audio data, when it is time to decode the audio data, the control unit 100 detects this in step 811, and in step 921 decodes the audio data of the main service channel corresponding to the decoding time. Store data in an audio output buffer (not shown). The above operation is repeatedly performed, and the decoded audio data stored in the audio output buffer is output together with the video data of the corresponding main service channel and reproduced through the speaker 155.

Second, referring to the decoding procedure of the video data, when it is time to decode the video data, the control unit 100 detects this in step 811 and performs steps 813 to 819 and performs the main service channel or the first frame in one frame section. Decode video data of a primary service channel and at least one secondary service channel. That is, the controller 100 accesses and decodes the video frame data of the corresponding main service channel stored in the input buffer 520 in step 813, where the decoding of the main service channel is performed in the first half of the frame period. The video frame data of the decoded main service channel is stored in the output buffer 540 of the main service channel. Thereafter, the controller 100 determines whether the video data of the secondary service channel is decoded. If the video data is the set frame (for example, I frame or I and P frame), the controller 100 stores the video frame of the corresponding secondary service channel stored in the input buffer 525. Data is accessed and decoded, otherwise it does not perform video data decoding operations of the secondary service channel (e.g., B and P frames or B frames, unless it is set video frame data). In this case, the decoding of the secondary service channel is performed in the second half of the frame period. The video frame data of the decoded sub service channel is stored in the output buffer 545 of the sub service channel. The above operation is repeatedly performed in units of frames, and the decoded video frame data stored in the video output buffers 540 and 645 are multiplexed through the display unit 150 which is output together with the audio data of the main service channel through the multi-screen processor 140. Is displayed on the screen.

When the decoder has a resizing function, the decoder may resize and decode video frame data of the sub-service channel.

As described above, the control unit 100 decodes the video data of the set frame of the primary and secondary service channels by dividing the interval of one frame period. In this case, the decoding performance of the decoder should have the capability of decoding at least two or more video frame data in one frame period. After performing the decoding operation, the control unit 100 multiplexes video data of the decoded primary and secondary service channels in step 719 of FIG. 9 to generate a multi-screen. In this case, the multi-screen may generate the screen of the sub service channel in the same size as the screen of the main service channel, and may also generate a screen for displaying the screen of the main service channel in a PIP form. The screen size of the sub service channel may be fixed and output to a preset screen size, and may be resized to a size according to a user's setting and output. In addition, the position of displaying the screen of the sub-service channel may be fixed to the display position of the display unit 150 which is not set, and may also be output to be adjusted to be displayed at an arbitrary position of the display unit 150 according to the user's setting.

11A and 11B are flowcharts illustrating a multi-screen processing procedure of video data according to an embodiment of the present invention. 11A and 11B illustrate an example of resizing sub-service channel data and displaying data of the resized sub-service channel in a PIP form on a screen of the main service channel.

Referring to FIG. 11A, the controller 100 resizes the frame data stored in the output buffer of the sub-service channel to a set size. In this case, the resizing size may be a preset screen size or a screen size set by a user. The resizing may be implemented with a scaler, and the entire screen of the sub-service channel may be resized by scaling all the pixels during the scaling, and may be resized by selecting pixels having a screen size set in the full screen of the sub-service channel. have. In this case, the controller 100 may output the video frame data stored in the output buffer of the main service channel in the state of resizing the video data of the sub service channel or the end of the resizing in step 913, and display it on the display unit 150. If it is the position to display the screen of the resized sub service channel, the controller 100 detects this in step 915 and multiplexes (or blends) the data of the sub service channel with the data of the main service channel in step 917. In this case, the operation of multiplexing or blending the sub service channel screen (PIP screen) on the main service channel screen (main screen), as described above, displays the video data of the main service channel in the main screen display area of the display unit 150. The video data of the sub service channel is selectively outputted in the PIP screen display area. When the broadcast data of the sub service channel is displayed on the PIP screen area, the controller 100 may display the broadcast data of the sub service channel as it is, and the broadcast of the main service channel is broadcasted to the broadcast data of the sub service channel. You can also blend and process the data.

When the above operation is performed, the controller 100 outputs video frame data of the main service channel to display on the display unit 150, and the video of the resized sub service channel is positioned at the position of displaying the video data of the sub service channel. By multiplexing the data, video data of the primary and secondary service channels are displayed on the screen of the display unit 150 in multiple screens. The above operation is repeated in units of frames, so that the screen displayed on the display unit 150 displays video data of the primary and secondary service channels in units of frames. Therefore, when the multiplexing of the video data of the primary and secondary service channels of one frame is terminated, in operation 919, the terminal detects and returns the multiplexing operation of the primary and secondary service channels of the next frame.

In the multiplexing operation, an area for displaying video data of a sub-service channel is set in a display area of the display unit 150, and video data of a sub-service channel is output in a set area, and video data of a main service channel is output in other areas. Output

FIG. 11B is a flowchart illustrating another method of multiplexing video data of the primary and secondary service channels.

Referring to FIG. 11B, in step 931 and 933, the controller 100 loads video data stored in the output buffers 540 and 645 of the primary and secondary service channels in every frame section, and in step 935 of the loaded secondary service channel. Resize video frame data. Thereafter, the video data of the resized sub service channel is blended at the display position of the set sub service channel while outputting the data of the main service channel. In this case, the blending ratio is set to a weight enough to display video data of the sub service channel. Thereafter, the controller 100 stores the blended data of the video data of the sub-service channel in the main service channel video data in the final output buffer and displays the data on the display unit 150.

The portable terminal may include a digital broadcast receiver configured and operated as described above. Fig. 12 is a diagram showing the configuration of a portable terminal having the digital broadcast receiver as described above.

Referring to FIG. 12, in the case of a portable terminal having the digital broadcast receiver, the configuration of the portable terminal of the memory 160, the key input unit 170, the display unit 150, and the speaker 155 may be used. In addition, the controller 100 may control a communication function of the mobile terminal and at the same time perform a function of controlling the operation of the digital broadcast receiver. The wireless communication unit 190 may be configured as a frequency converter for converting the received radio signal to the falling frequency conversion and the transmitted radio signal to the frequency conversion. In addition, a data processor including a modulator for modulating a transmission signal and demodulating a reception signal and a codec for encoding a transmission signal and decoding a reception signal during the wireless communication may be configured in the wireless communication unit 190. You can also configure

The portable terminal having the configuration as described above, the operation of the digital broadcast receiver in the communication mode is off, and performs the RF communication function through the wireless communication unit 190. In the broadcast mode, the communication function becomes a standby state.

In the mobile terminal having the configuration described above, the digital broadcast receiver displays broadcast data of a service channel selected by a user, and when a communication channel with a service channel or a broadcaster is required, a digital broadcast receiver provides a return channel through the wireless communication unit 190. Can be formed.

In this case, the digital broadcast receiver may select two or more service channels and display them in a multi-screen as described above. The digital broadcast receiver may have a broadcast receiver 110, a protocol processor 120, a decoder and a multi-screen processor 140 as described above. In the case of displaying multiple screens in the digital broadcasting reception having the above configuration, the user sets two or more service channels to be displayed in multiple screens. In this case, one service channel may be displayed as a main screen of multiple screens, and a service channel displayed on the main screen is referred to as a main service channel. At least one sub-service channel displayed as the sub-screen in the multi-screen is selected, and video data of the sub-service channel may be displayed in the PIP form on the main screen. When the multi-screen function is selected, the broadcast receiver 110 performs time slicing control to receive burst data of the selected primary and secondary service channels, and checks the PID of the received burst data to determine the primary and secondary service channels. Upon receiving burst data, the protocol processor 120 processes protocols of the received burst data, extracts final audio and video data, and stores them in the input buffers of the primary and secondary service channels, respectively.

The decoder 130 accesses and decodes the data of the primary and secondary service channels stored in the respective input buffers 520 and 525 in units of frames. The decoder 130 includes an audio decoder 590 and a video decoder 500. The video decoder 500 decodes video frame data of the primary and secondary service channels in one frame period. That is, the video decoder 500 decodes at least two video frame data in one frame period, where the two video frame data may be video frame data of a primary and a secondary service channel. In this case, the video decoder 500 may be a decoder having a resizing function. In this case, the video decoder 500 may resize and decode video data of the sub service channel.

Thereafter, the multi-screen processor 140 multiplexes the video data of the main service channel and the video data of the set frame of the sub-service channel output from the decoder 130 to generate a multi-screen. In this case, the multi-screen generating method is a method of adjusting the display screen size of the primary and secondary service channels in the same manner. In this case, the displayed multi-screen may have the same size of the main screen and the sub-screen. In addition, the screen size of the sub service channel may be determined by the user and may be fixed to a preset size. In this case, video data of the sub service channel should be resized to the sub picture display size. In this case, the resizing may be performed by adjusting all pixels of the video data of the sub service channel and selecting and resizing video data having a screen size set from the video data of the sub service channel. In addition, the screen display position of the sub service channel may be determined by the user and may be fixed to a preset position. In this case, the multi-screen processor 140 checks the display position of the sub-screen, and outputs and displays the video data of the sub-service channel in the sub-screen area in the main screen area displaying the video data of the main service channel. .

At this time, when an incoming call is generated in the state of displaying the multi-screen as described above, the controller 100 generates an alarm for the incoming call. In this case, the user may set the incoming alert mode, and the incoming call alert mode includes a general incoming alert and a silent incoming alert mode. When the general incoming alert is set, the controller 100 displays the incoming alert sound (melody, bell, music, etc.) set through the speaker 155, and displays the calling party subscriber information of the incoming call on the display unit 150. The silent incoming alert may be classified into a vibration alert and a display alert. When the vibration alert mode is set, when the incoming call is generated, the controller 100 drives a motor (not shown) to vibrate the portable terminal and displays the outgoing subscriber information of the incoming call on the display unit 150. When the display alert mode is set, when the incoming call is generated, the control unit 100 displays the calling party information of the incoming call along with a message for notifying that the incoming call is generated on the display unit 150. At this time, the incoming display displayed on the display unit 150 may be displayed by blinking. In this case, the incoming call information may be overlaid on the display unit 150 while the video data of the primary and secondary service channels are displayed on a multi-screen. In general, when the broadcast mode is performed, the user is watching a broadcast screen. Therefore, when the broadcast mode is set, a method of automatically setting the incoming call alert mode of the portable terminal to the display alert mode may be used.

In addition, the user of the portable terminal may generate an outgoing signal while displaying the multi-screen. That is, the digital broadcast has various service channels, and in this case, the broadcaster may require a request or response from the viewer during the broadcast. For example, in the case of a shopping service channel, a user needs a return communication channel to purchase a displayed product. In the service channels such as entertainment and games, the user can directly participate in a broadcast program. In this case, since the digital broadcast receiver performs unidirectional communication, it is preferable to communicate necessary information through the wireless communication unit 190. That is, the mobile terminal can perform a communication function through the wireless communication unit 190. In this case, the controller 100 may check information (for example, a phone number or IP information of a department that processes the corresponding program in the service channel) that can communicate with the service channel being broadcast. That is, when a DVH-H digital broadcast receiver is provided, the controller 100 may check telephone number and IP information related to a program of a corresponding service channel from the received ESG data. When the DMB digital broadcast receiver is provided, the controller 100 may check phone numbers and IP information related to a program of the corresponding service channel from the received EPG. Therefore, when the user of the mobile terminal selects the call function (that is, presses a call key), the wireless communication unit 190 establishes a communication channel with the corresponding service channel, and when the user generates call information (eg, purchase information, vote, etc.) The call information may be transmitted to the service channel side in broadcasting. The response result of the service channel being broadcast can be confirmed through the formed communication channel.

In this case, the screen displayed on the display unit 150 is displayed as multiple screens of the primary and secondary service channels. In this case, the user may position the cursor on the broadcast screen of the service channel to communicate with the key input unit 170 and request an outgoing call function. In this case, the controller 100 may know the positions of the broadcast screens of the primary and secondary service channels displayed on the display unit 150 as described above. Therefore, when the user places the cursor at a specific position of the multi-screen displayed on the display unit 150 and requests an outgoing communication function, the control unit 100 checks the position of the cursor on the display unit 100 and then checks the service channel and program information being broadcast. Then, a dialing operation according to communication information (eg, phone number, IP, etc.) corresponding to the program of the service channel may be performed.

When the call mode is performed in the broadcast mode as described above, the user may perform a communication function with the service channel being viewed in real time.

In addition, when the sub-service channel being watched is changed to the main service channel while the multi-screen is displayed as described above, the controller 100 controls the decoder 130 to convert the decoded video data of the changed main service channel to the main service channel. The decoded audio data is stored in the audio output buffer at the same time. The decoded video data of the changed sub service channel is stored in the output buffer 611 of the sub service channel. Then, the multi-screen processing unit 140 processes the video data of the changed main and sub service channels into a multi screen and displays them on the display unit 150, and the audio of the changed main service channel is reproduced by the speaker 155. Therefore, it is possible to quickly change the service channel when displaying a multi-screen.

In addition, when the sub-service channel being viewed is changed while the multi-screen is displayed as described above, the screen of the sub-service channel cannot be changed until the burst data of the changed sub-service channel is received. In this case, video data of the current secondary service channel may be displayed until burst data of the changed secondary service channel is received. In addition, until the burst data of the changed sub service channel is received, the video data display of the sub service channel may be omitted and the video data of the main service channel may be displayed. In addition, the data of the changed sub-service channel (for example, the logo of the corresponding service channel, a JPEG image, an MPEG image, a program broadcast at a corresponding time) until the burst data of the changed sub-service channel is received. Information, etc.) may be displayed.

As described above, the digital broadcast receiver according to the embodiment of the present invention has an advantage in that it is possible to display broadcast data transmitted from two or more service channels on a single screen in multiple screens. In this case, the multi-screen display method may display a plurality of broadcast signals by dividing them into a screen having a uniform size, and may display another broadcast screen in a PIP form on a broadcast screen of a specific service channel. In addition, in the case of the portable terminal including the digital broadcast receiver as described above, selecting a specific service channel displayed on the multi-screen in the user's selection can perform a communication function to form a communication channel, which is because An interactive communication function can be performed. When the sub service channel is changed to the main service channel in the state of displaying the multi-screen, the sub service channel can be changed and displayed in real time, and thus the service channel can be easily changed.

Claims (38)

In the multi-screen display of the digital broadcast receiver, A broadcast receiver which receives broadcast data of a set primary and at least one sub-service channel; A video decoder for time-dividing the period of the frame for each frame to decode all the frame video data of the main service channel and the video data of the set frame of the sub-service channel, and an audio decoder for decoding the audio data of the preset service channel. With decoder which becomes, A multi-screen processing unit which multiplexes and outputs the video data of the decoded main and sub service channels so as to be displayed in a set multi-screen; A display unit displaying the video data output from the multi-screen processing unit on a multi-screen; And a speaker for reproducing the decoded audio data. The apparatus of claim 1, wherein the set frame video data of the sub service channel decoded by the video decoder includes frame video data obtained by directly encoding the frame video data. The apparatus of claim 2, wherein the set frame video data of the sub service channel is intra frame video data. delete According to claim 3, The video decoder, Input buffers for storing data of the primary and secondary service channels, respectively; A multiplexer for time-dividing a frame section in each frame period to multiplex video frame data of the primary and secondary service channels stored in the input buffers; A decoder for decoding the video frame data of each of the multiplexed service channels; A demultiplexer for demultiplexing the video frame data output from the decoder to output buffers of a corresponding service channel, respectively; And a plurality of output buffers of the service channel for storing the demultiplexed decoded video data. 3. The multi-screen display apparatus of claim 2, wherein the audio decoder decodes audio data of a main service channel. The method of claim 2, wherein the multi-screen processing unit, A resizer for resizing the video data of the sub service channel to a set screen size; And a mixing unit for outputting video data of the primary service channel and outputting video data of the resized secondary service channel at a screen display position of the secondary service channel. 8. The multi-screen display apparatus of claim 7, wherein the multi-screen processing unit further comprises a positioning unit for displaying video data of the resized sub service channel at a predetermined position of the display unit. delete delete delete delete delete delete delete delete delete The method of claim 1, Further comprising a wireless communication unit for processing wireless communication data, A controller for processing a call generated according to operation of the communication mode when the communication mode is generated in the multi-screen display mode supporting the multi-screen display; And the display unit displays call information generated in the multi-screen display mode for displaying call information generated in the multi-screen display mode under the control of the controller. delete delete delete 19. The multi-screen display apparatus of claim 18, wherein the controller controls the display to display an incoming call alert including incoming subscriber information when the incoming call occurs in the multi-screen display mode. The multi-screen of the digital broadcast receiver as claimed in claim 18, wherein the control unit forms a communication channel with the service channel through the wireless communication unit when an outgoing signal is generated in the multi-screen display mode, and transmits outgoing information. Display device. delete In the multi-screen display method of the digital broadcast receiver, Receiving burst data of the established primary service channel and at least one secondary service channel; Extracting video and audio data from the burst data of the received service channels; A video decoding process of time-dividing the period of the frame for each frame to decode all frame video data of the main service channel and video data of a set frame of a sub-service channel; and Decoding audio data of a predetermined service channel; Multiplexing and outputting the video data of the decoded primary and secondary service channels to be displayed in a set multi-screen; And displaying the multiplexed video data on a multi screen and reproducing the decoded audio data. The method as claimed in claim 25, wherein the set frame video data of the sub service channel decoded by the video decoder includes frame video data obtained by directly encoding the frame video data. 27. The method of claim 26, wherein the set frame video data of the sub service channel is intra frame video data. delete The method of claim 27, wherein receiving the burst data comprises: Receiving broadcast signals of a physical channel including the primary and secondary service channels; Demodulating broadcast signals of a set service channel; And selecting a broadcast signal of the primary and secondary service channels set from the demodulated broadcast signal. The method of claim 29, wherein the displaying of the multi-screen is performed by: Resizing video data of the sub service channel to a set screen size; And outputting video data of the primary service channel, and outputting video data of the resized sub-service channel at a screen display position of the sub-service channel. The method of claim 30, wherein the displaying on the multi-screen is performed. And a positioning process for displaying video data of the resized sub service channel at a predetermined position of a display unit. The method of claim 29, wherein the video decoding process, Storing data of the primary and secondary service channels, respectively; If the frame video data of the sub-service channel is set frame video data at the start of frame decoding, the video frame data of the main and sub-service channels are multiplexed by time division of the frame, otherwise the video data of the main service channel is The multiplexing process, Decoding video frame data of each of the multiplexed service channels; And demultiplexing the decoded video frame data into output buffers of a corresponding service channel, respectively, and storing the decoded video frame data. 33. The method of claim 32, wherein the audio decoding process decodes audio data of the main service channel. 26. The method of claim 25, Displaying an incoming alert including called subscriber information on the displayed multiple screen when an incoming call occurs in the multi-screen display mode; And forming a communication channel with the selected service channel when the outgoing signal is generated in the multi-screen display mode, and transmitting outgoing information to the multi-screen display device. delete delete delete 35. The method as claimed in claim 34, wherein the transmitting of the calling information comprises automatically forming a communication channel by checking information on a service channel of the selected screen when selecting a screen and requesting calling on the displayed multi-screen. A multi-screen display method of the portable terminal having a digital broadcast receiver.

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