KR20060025386A - Mobile dmb terminal device equiped time-shift function and method of embodiment time-shift function on mobile dmb terminal device - Google Patents

Abstract

The present invention relates to a mobile DMB terminal having a time shift function, comprising: a DMB broadcast receiver which receives a DMB broadcast signal and converts it into a transport stream (TS); A transport stream memory configured to continuously receive and buffer the transport stream from the DMB broadcast receiver; A demultiplexer configured to selectively receive the transport stream from the transport stream memory or the DMB broadcast receiver according to a control signal from a PVR controller to generate a packetized element stream (PES); A depacketizer for receiving the packetized elementary stream from the demultiplexer and separating the packetized elementary stream into a video elementary stream, an audio elementary stream, an OD / BIFS stream, and IOD data; A decoding unit for decoding the video element stream, the audio element stream, the OD / BIFS stream, and the IOD data from the depacketizer; And the PVR controller for controlling the transport stream memory and the demultiplexer according to a request of a time shift function by a viewer, wherein the PVR controller is configured to transmit a new transport stream to the transport stream memory according to a request of a time shift function. Blocking the input of the control unit, and the demultiplexer controls the transport stream to receive the transport stream from the transport stream memory, thereby providing the effect of implementing a time shift function in a low-end mobile DMB terminal.

DMB broadcasting, wireless data network, delayed broadcasting, mobile DMB terminal, digital multimedia broadcasting, wireless data network, time shift, PVR, mobile DMB terminal

Description

Mobile DMB Terminal Device Equiped Time-Shift Function and Method of Embodiment Time-Shift function on Mobile DMB Terminal Device}

1 is a block diagram illustrating a DMB broadcast receiving unit of a DMB receiver.

2 is a block diagram illustrating a mobile DMB broadcasting system for providing a time shift function according to an embodiment of the present invention.

3 is a block diagram of a mobile DMB terminal providing a time shift function according to an embodiment of the present invention.

4 is a block diagram illustrating a DMB broadcast receiving unit of a mobile DMB terminal according to an embodiment of the present invention.

5A to 5C are examples of a driving screen configuration of a time shift function according to an embodiment of the present invention.

6 is a flowchart illustrating a method of implementing a time shift function of a mobile DMB terminal according to an embodiment of the present invention.

7 is a flowchart illustrating a video clip storing process of a mobile DMB terminal according to an embodiment of the present invention.

8 is a flowchart illustrating a video clip transmission process of a mobile DMB terminal according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: mobile DMB terminal 110: control unit

111: PVR control unit 112: movie clip generation unit

120: transmission stream memory 130: movie clip memory

140: DMB broadcast signal receiver 143: demultiplexer

150: wireless data network connection

The present invention relates to a mobile DMB terminal having a time shift function and a method of implementing a time shift function of a mobile DMB terminal.

Unlike analog broadcasting, which is poor in quality due to recording and reproduction of a broadcast, DMB broadcasting using a digital signal provides an advantage of easily storing and playing a received digital broadcasting program in the form of data. In particular, in fixed DMB terminals such as set-top boxes, it is easy to implement a personal video recorder (PVR) function using a digital image processing processor and a large memory. However, in a mobile DMB terminal manufactured in a portable size, there is a problem in that it is difficult to store a digital image due to a limited storage capacity and a low specification processor. In particular, since image processing for storing digital video data requires a lot of computation, not only does it increase the power consumption of the mobile DMB terminal but also generates excessive heat due to the computational burden of the processor.

1 illustrates a process of restoring digital broadcasting of a general DMB terminal. The DMB broadcast signal received through the antenna is converted into a data stream through demodulation, and the interleaved and RS coated data stream is convolutional de-interleaver (141) for error-resistant transmission. ), Which is restored to a transport stream (TS) via an RS decoder (Reed-Solomon Decoder: 142), and the transport stream (TS) is a packetized element through a transport stream demultiplexer (De-MUX: 143). Demultiplexed into a packetized elementary stream (PES). The packetized element stream (PES) is divided into a video element stream, an audio element stream, an OD / BIFS stream, and IOD data through the depacketizer 144, respectively, so that the video decoder 145, the audio decoder 146, Through the OD / BIFS decoder 147 and the IOD parser 148, the DMB terminal outputs to the viewer as a broadcast program.

However, stream data such as a video element stream and an audio element stream have a streaming structure unlike a video file (eg, an MPG file, an AVI file, an RM file, etc.) that can be driven by a normal computer, and has a data structure according to the DMB broadcasting standard. Has Accordingly, in order to implement a PVR service of a conventional digital broadcasting receiver, since streaming data is configured and stored as a separate file, a high performance video processing chip is required, and manufacturing cost increases as the structure of the receiver becomes complicated. There was a problem.

The present invention is to solve the above problems, in the mobile DMB terminal, a transport stream memory for temporarily storing the received transport stream (TS) for the time shifting function, the demultiplexer is a DMB broadcast receiver or An object of the present invention is to provide a mobile DMB terminal capable of providing a time shift function in a mobile DMB terminal as a simple configuration for selectively receiving any one of transport streams transmitted from a transport stream memory.

According to another embodiment of the present invention, the mobile DMB terminal further includes a video clip generating unit for generating a video clip of a computer-driven file type to move the viewer to generate a desired broadcast program scene as a video clip in a simple manner. Another object is to provide a DMB terminal.

According to another embodiment of the present invention, another object of the present invention is to provide a mobile DMB terminal capable of easily updating a generated video clip in a video clip storage unit such as a blog server on a communication network.

Lastly, according to another embodiment of the present invention, another object of the present invention is to provide a mobile DMB terminal capable of transmitting a generated video clip to another person through a short message service (SMS) or a multimedia message service (MMS). .

In order to achieve the above object, a mobile DMB terminal according to the present invention comprises: a DMB broadcast receiving unit for receiving a DMB room transmission call and converting it into a transport stream (TS); A transport stream memory configured to continuously receive and buffer the transport stream from the DMB broadcast receiver; A demultiplexer configured to selectively receive the transport stream from the transport stream memory or the DMB broadcast receiver according to a control signal from a PVR controller to generate a packetized element stream (PES); A depacketizer for receiving the packetized elementary stream from the demultiplexer and separating the packetized elementary stream into a video elementary stream, an audio elementary stream, an OD / BIFS stream, and IOD data; A decoding unit for decoding the video element stream, the audio element stream, the OD / BIFS stream, and the IOD data from the depacketizer; And the PVR controller for controlling the transport stream memory and the demultiplexer according to a request of a time shift function by a viewer, wherein the PVR controller is configured to transmit a new transport stream to the transport stream memory according to a request of a time shift function. Blocking the input of the, characterized in that for controlling the demultiplexer to receive the transport stream from the transport stream memory.

According to an aspect of the present invention, there is provided a method of implementing a time shift function of a mobile DMB terminal, comprising: a first step of receiving, by a mobile DMB terminal, a DMB broadcast signal and extracting a transport stream; A second step of the mobile DMB terminal decoding the transport stream to output a broadcast program, and storing the transport stream; A third step of displaying a PVR menu including a time shift function by overlapping a broadcast screen of a display window according to a viewer's request for a PVR function; A fourth step of receiving a playing section setting; And a fifth step of decoding and outputting the stored transport stream corresponding to the playback section.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 illustrates a system for providing time shift service in DMB broadcasting including a mobile DMB terminal according to an embodiment of the present invention. The mobile DMB terminal 100 according to the present invention receives a DMB broadcast signal multiplexed with a video stream, an audio stream, and control data from the DMB broadcast transmitting station 420 through the multiplexer 410. The mobile DMB terminal 100 further stores a video clip installed on the communication network 500 through the wireless data network 300 as shown by adding a separate wireless data network connection unit 150 as well as the DMB broadcasting station 400. It is desirable to be able to connect to the server 200.

3 illustrates a structure of a mobile DMB terminal according to an embodiment of the present invention. The mobile DMB terminal 100 according to the present invention includes a DMB broadcast signal receiver 140, a transport stream memory 120, a controller 110, a key input unit 160, and an output unit 170. The DMB broadcast signal receiving unit receives the DMB broadcast signal, restores the video and audio signals by demodulation and decoding, and outputs the same to the viewer. The transport stream memory 120 stores the received transport stream 120.

The DMB broadcast signal receiver 140 and the transport stream memory 120 will be described in more detail with reference to FIG. 4 as follows. DMB broadcast receiver 140, deinterleaver 141, RS decoder 142, depacketizer 144, video decoder 145, audio decoder 146, OD / BIFS decoder 147, and IOD parser ( 148 is the same as the conventional DMB receiving apparatus, so a detailed description thereof will be omitted.

According to the present invention, the transport stream TS transmitted from the DMB broadcast receiver 140 to the deinterleaver 141 and the RS decoder 142 is input to the demultiplexer 143 and packetized as in the conventional case. The generated element stream (PES) is generated and input to the transport stream memory 120 in the present invention. Unlike the buffer memory required for receiving the streaming data in general, the transport stream memory 120 of the present invention is a memory for storing a large amount of transport streams corresponding to a predetermined time or more (for example, about 3 minutes). The transport stream memory 120 uses a memory device free of input / output of data such as a DRAM, a flash memory, and the like, and is continuously updated with a new transport stream as the transport stream is received.

Unlike the conventional DMB receiver which receives only the transport stream TS transmitted from the RS decoder 142, the demultiplexer 143 transmits not only a transport stream TS transmitted from the RS decoder 142 but also a transmission. The transport stream D_TS transmitted from the stream memory 120 may be received. The case of receiving the transport stream TS from the RS decoder 142 is a normal case of outputting the data stream currently being broadcast, and the time delay when the transport stream D_TS from the transport stream memory 120 is received. This is the case for playback (time shift).

As shown in FIG. 5A, when a viewer requests a PVR function by inputting a specific key 174 while watching a broadcast, the PVR application displays the PVR menu 172 on the screen. When the viewer selects to view the last scene in the PVR menu 172, the PVR controller 111 controls the transport stream memory 120 so as not to receive a new transport stream TS further, and the currently stored transport stream D_TS. ). The transport stream stored in the transport stream memory 120 is a transport stream received about a set time, for example, about 5 minutes ago, and extracts a transport stream of a desired time (for example, 1 minute ago) by analyzing time stamp information of a transport stream header. Input to the demultiplexer 143. At this time, the PVR controller 111 controls the demultiplexer 143 to selectively process the delayed transport stream D_TS transmitted from the transport stream memory 120 without processing the input of the currently transmitted transport stream TS. Do it.

According to this configuration, the mobile DMB terminal 100 stores the delayed transport stream D_TS in the transport stream memory 120 without adding a separate video processor and video storage means, and transmits the transport stream through the PVR controller. A simple method of controlling the memory 120 and the demultiplexer provides an effect of enabling time delay playback in a mobile terminal.

On the other hand, the video element stream (from the depacketization unit 144 according to the control signal of the PVR controller 111 so that the mobile DMB terminal 120 generates a time-delayed playback (time-shifted) broadcast scene as a separate video clip) V_ES), an audio element stream (A_ES), an OD / BIFS stream (OD / BIFS), and an IOD data (IOD) to receive a video clip generation unit 112 for generating a video clip of a file type that can be reproduced by a computer. It is preferable to further include. According to this embodiment, the video clip generation unit 112 for video processing has a further disadvantage, but since it is possible to store or transmit as a computer file for the viewer's favorite scene, 2 It provides the effect that it can be used in the future.

The mobile DMB terminal 100 may further include a video clip memory 130 for storing the video clip generated by the video clip generating unit according to the control signal of the PVR control unit 111. In this case, unlike the transport stream memory 120 that temporarily stores the transport stream itself, the video clip memory 130 stores the video clip requested by the user in the form of a computer file. According to this embodiment, the viewer provides an effect of playing the stored video clip on the mobile DMB terminal at any time.

According to another embodiment of the present invention, the mobile DMB terminal 100 further includes a wireless data network connection unit 150 that can be connected to the wireless data communication network 300, and according to the control signal of the PVR controller 111, the video clip The video clip generated by the generation unit 112 may be transmitted to and stored in the video clip storage server 200 installed on the communication network 500. The video clip storage server 200 may be a web-hard server, a blog server, etc. of the viewer, and the viewer may directly scrap the scene of his or her favorite DMB TV into a video clip of his / her homepage, blog page, and web. It provides an effect that can be used in the storage service provided in the above.

Meanwhile, the video clip generated by the mobile DMB terminal 100 may be transmitted to not only viewers but also other mobile communication terminals, mobile DMB terminals, computers, and the like. First, the method of transmitting a video clip is to register a video clip to a server on the web, and transfer the access information of the video clip to another user, and then the other user connects to the video clip storage server where the video clip is stored through his terminal. Secondly, there is a method of transmitting a video clip itself to another user. According to an embodiment using the first method, the mobile DMB terminal 100 further includes an SMS transmission means, and includes an SMS text message including access information of a video clip stored in the video clip storage server 200 at a designated phone number. Configure to send. According to an embodiment using the second method, the mobile DMB terminal 100 further includes a wireless data communication network connection unit 150 and a multimedia message service (MMS) transmitting means capable of accessing the wireless data communication network to a designated telephone number. The moving picture clip generated by the moving picture clip generator is configured as an MMS message.

6 illustrates a method of implementing a time shift function of a mobile DMB terminal according to an embodiment of the present invention. First, the mobile DMB terminal 100 receives a DMB broadcast signal (S100) and extracts a transport stream (TS). Next, the mobile DMB terminal 100 decodes the transport stream TS to output a broadcast program, and stores the transport stream TS in the transport stream memory 120. Next, in response to the viewer's PVR function request (S110), the PVR application is driven and superimposed on the broadcast screen 171 of the display window to display the PVR menu 172 including the time shift function. Next, as shown in FIG. 5B, the playback section is input to the playback section (S130), stored in the transport stream memory 120, and the transport section D_TS corresponding to the playback section is decoded to output the playback section (S130). S140). In this case, when the viewer selects the repeat play function (S150), when the play of the corresponding section ends, the play of the corresponding section is repeated again (S140).

As described above, it is preferable to store the time-shifted scene as a separate video clip (S160, S170), or transmit to another user (S180, S190).

Referring to FIG. 7, a video clip is stored. First, a video clip in the form of a computer file that can be played on a computer is generated by decoding the stored transport stream D_TS. Next, when the generated video clip is to be stored in the server 200 on the communication network 500 (S171), the mobile DMB terminal 100 through the wireless data communication network (300,500) (S172) video clip storage server 200 After accessing (S173), the video clip is sent to the video clip storage server 200 to be stored (S174). When the video clip is stored in the mobile DMB terminal 100 itself (S175), the video clip is stored in the video clip memory 130 of the mobile DMB terminal (S176).

A case of transmitting a video clip with reference to FIG. 8 will now be described. If you want to transmit using SMS (S191), first access the wireless data network (S192), and store the video clip in the video clip storage server (S193, S194), the video clip stored in the video clip storage server An SMS message including access information (eg, access URL) is generated and transmitted to the telephone number designated by the viewer (S195, S196). If it is desired to transmit using MMS (S197), accessing the wireless data network (S198) transmits the video clip generated by the video clip generator 112 to the designated phone number as an MMS message (S199, S200). .

As described above, according to the mobile DMB terminal having a time shift function and a method of implementing the time shift function of the mobile DMB terminal according to the present invention, even in a low specification mobile DMB terminal, a transport stream memory may be added even if no additional video processor is added. An additional simple configuration provides the effect of implementing the time shift function.

According to a preferred embodiment of the present invention, a time-shifted broadcast program can be generated as a video clip and stored in a mobile DMB terminal or a server on the web, and can be transmitted to other users via SMS or MMS.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (12)

A DMB broadcast receiver which receives a DMB broadcast signal and converts it into a transport stream (TS); A transport stream memory configured to continuously receive and buffer the transport stream from the DMB broadcast receiver; A demultiplexer configured to selectively receive the transport stream from the transport stream memory or the DMB broadcast receiver according to a control signal from a PVR controller to generate a packetized element stream (PES); A depacketizer for receiving the packetized elementary stream from the demultiplexer and separating the packetized elementary stream into a video elementary stream, an audio elementary stream, an OD / BIFS stream, and IOD data; A decoding unit for decoding the video element stream, the audio element stream, the OD / BIFS stream, and the IOD data from the depacketizer; And And the PVR controller for controlling the transport stream memory and the demultiplexer according to a viewer's request for a time shift function. The PVR controller may block input of a new transport stream into the transport stream memory according to a request of a time shift function, and control the demultiplexer to receive the transport stream from the transport stream memory. Mobile DMB terminal with functions. The method of claim 1, wherein the mobile DMB terminal, A video for generating a video clip in the form of a file that can be received by the video element stream, the audio element stream, the OD / BIFS stream, and the IOD data from the depacketizer according to a control signal of the PVR controller. Mobile DMB terminal having a time shift function, characterized in that it further comprises a clip generation unit. The method of claim 2, wherein the mobile DMB terminal, And a video clip memory for storing the video clip generated by the video clip generation unit according to a control signal of the PVR control unit. Mobile DMB terminal having a time shift function, characterized in that for outputting the video clip stored in the video clip memory to the display window of the mobile DMB terminal according to the control signal of the PVR controller. The method of claim 2 or 3, wherein the mobile DMB terminal, Further provided with a wireless data network connection for connecting to a wireless data network, Mobile DMB terminal having a time shift function characterized in that for transmitting the video clip generated by the video clip generating unit to the video clip storage server installed on the communication network according to the control signal of the PVR controller. The method of claim 4, wherein the mobile DMB terminal, A mobile DMB terminal having a time shift function, characterized in that it further comprises an SMS transmission means for transmitting an SMS text message including access information of the video clip stored in the video clip storage server to a designated telephone number. The method of claim 2 or 3, wherein the mobile DMB terminal, And a MMS (Multimedia Message Service) transmission means for connecting to a wireless data communication network, and transmitting the moving picture clip generated by the moving picture clip generation unit as an MMS message to a designated telephone number. A mobile DMB terminal having a time shift function. A first step of the mobile DMB terminal receiving the DMB broadcast signal and extracting a transport stream; A second step of the mobile DMB terminal decoding the transport stream to output a broadcast program, and storing the transport stream; A third step of displaying a PVR menu including a time shift function by overlapping a broadcast screen of a display window according to a viewer's request for a PVR function; A fourth step of receiving a playing section setting; And And a fifth step of decoding and outputting the stored transport stream corresponding to the playback section. The method of claim 7, wherein And a sixth step of decoding the stored transport stream to generate a video clip in the form of a computer file that can be played in a computer. The method of claim 8, And a seventh step of storing the video clip in a memory of the mobile DMB terminal. The method according to claim 8 or 9, An eighth step of allowing the mobile DMB terminal to access a video clip storage server through a wireless data communication network; And a ninth step of transmitting and storing the video clip to the video clip storage server. The method of claim 10, And a tenth step of transmitting an SMS message including access information of the video clip stored in the video clip storage server to a designated phone number. The method according to claim 8 or 9, And an eleventh step of transmitting the video clip generated by the video clip generator to a designated phone number as an MMS message.

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