KR100725928B1 - DMB Receiving Terminal Apparatus and Method for high-speed decoding of broadcasting contents - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a digital multimedia broadcasting receiving terminal device for fast decoding of broadcast contents and a method thereof.

2. The technical problem to be solved by the invention

According to the present invention, information necessary for decoding a content of a broadcast channel selected by a user (viewer) is stored in advance in a broadcast receiving terminal, thereby minimizing delay time required for normal decoding of content transmitted through a broadcast channel selected by a viewer. Disclosure of the Invention It is an object of the present invention to provide a digital multimedia broadcasting receiving terminal device and a method thereof for high speed decoding of broadcast contents.

3. Summary of Solution to Invention

A digital multimedia broadcasting (DMB) receiving terminal apparatus, comprising: tuning means for selecting a broadcast signal of a specific channel according to a user's request from a wireless broadcast signal input from an external device; Channel decoding means for obtaining an ensemble by performing channel decoding on the broadcast signal of the specific channel; Decoding information necessary to decode broadcast content of a specific channel selected by a user, including subchannel identification information (ID), PID (packet identifier) of a program map table (PMT), and object descriptor (OD) stream / binary form screen information (BIFS). Storage means for storing a PID of the stream / media stream; After the transport stream is obtained from the ensemble using the stored subchannel identification information (ID), the PID of the stored PMT and the PID of an object descriptor (OD) stream / binary form screen information (BIFS) stream / media stream are used. Ensemble and transport stream demultiplexing means for extracting an initial object descriptor (IOD) and an elementary stream (ES) from the obtained transport stream; Decoding means for decoding the elementary stream and the initial object descriptor (IOD); And scene composition means for composing a broadcast content scene using the information decoded by the decoding means.

4. Important uses of the invention

The present invention is used in the DMB receiving apparatus.

Mobile multimedia broadcasting, DMB, channel information, decoding information, PID, PMT

Description

DMB Receiving Terminal Apparatus and Method for high-speed decoding of broadcasting contents}             

1 is an exemplary configuration diagram of a conventional terrestrial DMB receiving terminal device;

2 is a configuration diagram of a transmission frame for transmission of an ensemble in a conventional terrestrial DMB;

3 is a flowchart illustrating a DMB broadcast receiving method in a conventional terrestrial DMB receiving terminal device;

4 is a configuration diagram of an embodiment of a digital multimedia broadcasting (DMB) receiving terminal device for fast decoding of broadcast contents according to the present invention;

5 is a flowchart illustrating a method for receiving digital multimedia broadcasting (DMB) for fast decoding of broadcast contents according to the present invention.

* Explanation of symbols for the main parts of the drawings

401: tuner 402: channel decoder

403: ensemble demultiplexer 404: storage unit

405: MPEG-2 Transport Stream Demultiplexer 406: IOD Decoder

407: ES decoder 408: scene composition

The present invention relates to a digital multimedia broadcasting (DMB) receiving terminal apparatus for fast decoding of broadcast contents and a method thereof, and more particularly, to a broadcast receiving terminal, information necessary for decoding contents of a broadcasting channel selected by a user (viewer). The present invention relates to a digital multimedia broadcasting (DMB) receiving terminal apparatus for fast decoding of broadcast contents, which minimizes a delay time required to normally decode contents transmitted through a broadcast channel selected by a viewer, and a method thereof.

1 is a diagram illustrating a configuration of a conventional terrestrial DMB receiving terminal device, and FIG. 2 is a diagram illustrating a structure of a transmission frame for transmitting an ensemble in a conventional terrestrial DMB receiving device. FIG. A flowchart of a reception method shows an overall operation of the conventional broadcast reception terminal apparatus of FIG. 2. Hereinafter, FIGS. 1 to 3 will be described together.

A conventional terrestrial DMB receiving terminal device, as shown in FIG. 1, includes a tuner 101, a channel decoder 102, an ensemble demultiplexer 103, an MPEG-2 TS demultiplexer 104, and an initial object descriptor (IOD). Initial Object Descriptor (105) decoder 105, elementary stream (ES) decoders 106, and the scene configuration unit 107.

Here, the ES decoders 106 are composed of a plurality of ES decoders, each of which is an object descriptor (OD) stream and binary format screen information (BIFS) defined in the MPEG-4 system standard. for Scene) may include a decoder for decoding a stream, a decoder for decoding a video stream, a decoder for decoding an audio stream, and decoders for decoding ESs such as still image streams other than the above-described ESs.

The operation of the general terrestrial DMB receiving terminal device configured as described above will be described in detail as follows.

When the RF broadcast signal is input through the antenna (301), the tuner 101 selects a broadcast signal of a specific channel from the input RF broadcast signal by tuning according to the channel frequency selected by the viewer, thereby broadcasting the signal of intermediate frequency (IF). The channel decoder 102 performs channel decoding on the channel-encoded IF signal resulting from the tuning, and passes the resulting ensemble to the ensemble demultiplexer 103 (303).

Here, the ensemble consists of one or more services, the service consists of one or more service components, and information about these services and service components is also included in the ensemble.

Looking at the ensemble in terms of transmission standards, the transmission frame for transmission of the ensemble is a synchronization channel (201), a fast information channel (FIC) (202), as shown in FIG. ), And a main service channel (MSC) 203. Here, the synchronization channel 201 is for synchronization of transmission signals, and the fast information channel (FIC) 202 includes data for controlling multiplexing, information on each service, and other FIC data. . On the other hand, the main service channel (MSC) 203 includes information about the service and data necessary for the actual service, for example, audio data, video, and other data, and the main service channel (MSC) includes a plurality of It consists of subchannels.

The demultiplexing processes 304, 305 to 307 in the ensemble demultiplexer 103 are described as follows.

The ensemble demultiplexer 103 demultiplexes the ensemble to extract information and data corresponding to the service selected by the viewer from among the services included in the ensemble. At this time, in order to extract the data necessary for the service selected by the viewer, identification information (ID) of the service selected by the viewer, the number of components included in the service, identification information (ID) of the subchannel in which each component is stored, and the like are included. If necessary, the ensemble demultiplexer 103 obtains this information through the interpretation of the fast information channel (FIC). Demuxing the ensemble in terrestrial DMB broadcasting results in an MPEG-2 TS stream.

The MPEG-2 TS demultiplexer 104 analyzes an MPEG-2 TS stream to separate various Elementary Streams (ES) and Initial Object Descriptors (IODs) included in the TS stream. Here, the ES included in the MPEG-2 TS includes not only an audio stream and a video stream constituting the content, but also a BIFS (Binary Format for Scene) stream containing screen configuration information about the provided content, and media included in the content. There is an OD (Object Descriptor) stream that contains information about the stream, and may include a still image stream if necessary.

The IOD decoder 105 analyzes the IOD to initialize the terminal, and the ES decoders 106 decode several ESs included in the content, and the decoded information is synthesized by the scene composition unit 107. Screen and sound are output.

The operation from the MPEG-2 TS demultiplexer 104 to the picture and sound output will be described in detail as follows.

First, a PAT (Program Association Table) whose PID (Packet Identifier) is '0' is found in the MPEG-2 TS (309). The PAT is analyzed to find the PID of the Program Map Table (PMT) (310), and the PMT is obtained from the TS packet having the PID using the found PID (311). The PMT stores the IOD, and also stores the stream type of the media streams included in the TS stream and the PID of the media stream.

The PMT finds the IOD and obtains the ES_ID of the BIFS stream and the ES_ID of the OD stream from the BIFS stream and the elementary stream descriptor (ES_Descriptor) included in the IOD.

Then, after comparing the ES_ID of the BIFS stream with the information included in the PMT to obtain the PID of the BIFS stream (312), the PID is used to find the BIFS stream from the TS stream (313) and decode (314) the scene. Configure 315.

In addition, the PID of the OD stream is obtained by comparing the ES_ID of the OD stream with information included in the PMT (312), and the OD stream is found (313) and decoded using this PID (314). The base stream descriptors (ES Descriptors) of the media streams included in the TS stream are found from the decoded OD stream, and the PIDs of the media streams are found by comparing these information with the information included in the PMT.

The PIDs of the media streams are used to find and decode the media stream from the TS stream (313), decode (314), complete the scene configuration (15), and output the screen and sound (316).

In the above-described DMB receiving terminal apparatus, when the viewer (user) first turns on the receiving terminal apparatus or changes the channel, the delay time for receiving terrestrial DMB contents and outputting the screen and sound normally is as follows. same.

First, tune to the frequency of the channel selected by the viewer, and then find the FIC information. In this case, the transmission period of the FIC information varies depending on the application service, and a delay time corresponding to the FIC transmission period according to each application service is required.

In order to decode the MPEG-2 TS, the PAT must first be decoded. Since the PAT has a transmission period of 500 mS or less, a delay time of up to 500 mS may occur when decoding the PAT.

After decoding the PAT, it is necessary to decode the PMT using the PID of the PMT obtained through the PMT. Since the PMT has a transmission period of 500 mS or less, a delay time of up to 500 mS may occur when decoding the PMT.

After PMT decoding, the OD stream and the BIFS stream must be decoded, and since the OD stream and the BIFS stream each have a transmission period of 500 mS or less, delay time up to 500 mS may occur in decoding the OD stream and the BIFS stream, respectively.

In other words, when a viewer selects a channel to be watched, various information must be sequentially decoded in order for the receiving terminal device to normally display the content provided by the selected channel. There was a problem that occurred.

The present invention has been proposed to solve the above problems, and by storing information necessary to decode the content of the broadcast channel selected by the user (viewer) in advance in the broadcast receiving terminal, the content transmitted through the broadcast channel selected by the viewer is normally stored. It is an object of the present invention to provide a digital multimedia broadcasting (DMB) receiving terminal device and a method thereof for high speed decoding of broadcast content, which minimizes the delay time required for decoding.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention, there is provided a digital multimedia broadcasting (DMB) receiving terminal apparatus, comprising: tuning means for selecting a broadcast signal of a specific channel according to a user's request from a wireless broadcast signal input from an external device; Channel decoding means for obtaining an ensemble by performing channel decoding on the broadcast signal of the specific channel; Decoding information necessary to decode broadcast content of a specific channel selected by a user, including subchannel identification information (ID), PID (packet identifier) of a program map table (PMT), and object descriptor (OD) stream / binary form screen information (BIFS). Storage means for storing a PID of the stream / media stream; After the transport stream is obtained from the ensemble using the stored subchannel identification information (ID), the PID of the stored PMT and the PID of an object descriptor (OD) stream / binary form screen information (BIFS) stream / media stream are used. Ensemble and transport stream demultiplexing means for extracting an initial object descriptor (IOD) and an elementary stream (ES) from the obtained transport stream; Decoding means for decoding the elementary stream and the initial object descriptor (IOD); And scene composition means for composing a broadcast content scene using the information decoded by the decoding means.

Meanwhile, the method of the present invention selects a broadcast signal of a specific channel according to a user's request from a wireless broadcast signal input from the outside, and performs tuning and channel decoding on the broadcast signal of the specific channel to obtain an ensemble. Decoding step; An ensemble demultiplexing step of separating a subchannel from the ensemble using subchannel identification information (ID) stored in a storage means, and demultiplexing the ensemble using the subchannel to obtain a transport stream; After extracting the PMT from the transport stream using the PID of the PMT stored in the storage means, an initial object descriptor (IOD) included in the PMT is extracted, and the object descriptor (OD) stream / binary form screen information stored in the storage means. A transport stream demultiplexing step of extracting an OD stream / BIFS stream / media stream from the transport stream using respective PIDs for the (BIFS) stream / media stream; Decoding the OD stream / BIFS stream / media stream and the initial object descriptor (IOD), and using the decoded information, to decode and construct a scene of a broadcast content.

According to the present invention, when receiving a terrestrial DMB broadcast, it is possible to shorten the time required for normal decoding of the received broadcast content when the viewer changes the channel or when the terminal is first turned on.

That is, the present invention reduces the time required to normally decode the content transmitted through the channel selected by the viewer by minimizing the delay by storing information necessary for decoding the content of the channel selected by the viewer in advance in the broadcast receiving terminal. It is about.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a configuration diagram of an embodiment of a digital multimedia broadcasting reception terminal for fast decoding of broadcast contents according to the present invention.

The present invention provides a terminal device for receiving a terrestrial DMB broadcast, by storing information necessary for a normal decoding of content being transmitted through a channel selected by the viewer in the terminal, and using the channel selected by the viewer using the information. This is to minimize the delay required for normal decoding of the content being transmitted.

That is, the present invention relates to a terrestrial DMB terminal apparatus for receiving and playing terrestrial DMB interactive content, which is transmitted through a corresponding channel when the viewer turns on the terminal apparatus or changes the channel being viewed. By providing a storage unit that can store necessary information to reduce the initial delay time required to decode the program, it is to provide a function that can reduce the initial delay time required for decoding by using the decoding information stored in the storage unit.

The terrestrial DMB terminal device according to the present invention includes a storage unit 404 for storing information necessary for decoding received content, and the storage unit 404 is a permanent memory (ROM) or non-persistent. It may be a memory. When the storage unit 404 is a non-persistent memory, the storage unit 404 includes an interface for receiving and storing necessary information through a broadcasting network, a wired / wireless communication network, or a wired / wireless internet. It contains an interface for storing.

In addition, the ensemble demultiplexer 403 and the MPEG-2 TS demultiplexer 405 of the terrestrial DMB terminal device use not only the functions provided by the existing terminal but also the initial delay time using the decoding information stored in the storage unit 404. It is characterized by having a function which can greatly reduce.

Hereinafter, the detailed description will be made with reference to FIG. 4.

The tuner 401 selects a broadcast signal of a specific channel from a radio broadcast signal (RF broadcast signal) input from the outside through an antenna and outputs it as an intermediate frequency (IF) signal according to a user's request.

The channel decoder 402 obtains an ensemble by performing channel decoding on a broadcast signal (IF signal) of a specific channel.

The storage unit 404 may be configured to decode the broadcasting content of the specific channel selected by the user, for example, subchannel identification information (ID), PID (Packet Identifier) of the PMT, and object descriptor (OD) stream / binary form. Stores PID of screen information (BIFS) stream / media stream. The decoded information may be directly stored by the user, or may be downloaded and stored / updated from a server providing the decoded information through a wired or wireless communication network.

The ensemble demux 403 separates subchannels from the ensemble using subchannel identification information (ID) stored in the storage unit 404, and demultiplexes the ensemble using the subchannels. Acquire.

Meanwhile, the transport stream demultiplexer (MPEG-2 TS DEMUX) 405 extracts the PMT from the transport stream using the PID of the PMT stored in the storage unit 404 and an initial object descriptor (IOD) included in the extracted PMT. Extracts and separates the OD stream / BIFS stream / media stream from the transport stream using respective PIDs for the OD stream / BIFS stream / media stream stored in the storage unit 404.

The ES decoder 407 decodes the OD stream / BIFS stream / media stream extracted by the transport stream demultiplexer 405, and the IOD decoder 406 decodes the initial object descriptor (IOD).

The scene composer 408 composes a broadcast content scene using decoding information such as an OD stream / BIFS stream / media stream and an initial object descriptor (IOD) decoded by the decoders 406 and 407 to display a screen and sound. Outputs

FIG. 5 is a flowchart illustrating a method for receiving digital multimedia broadcasting for high speed decoding of broadcast contents according to the present invention, which is a digital multimedia broadcasting (DMB) receiving terminal apparatus for high speed decoding of broadcast contents described in FIG. The method performed is shown.

In the present invention, the information necessary to decode the received content is stored in advance in the broadcast receiving terminal device, and then the delay time is reduced by using the same. As shown in FIG. 5, the subchannel ID and MPEG necessary for ensemble demultiplexing are shown. -2 After storing the PID of the PMT, the PID of the OD stream, the PID of the BIFS stream, and the media streams required for TS de-multiplexing in the storage unit 404 of the broadcast receiving terminal device in advance, ensemble demultiplexing and TS demultiplexing are performed. This information can be used to reduce the initial delay time.

Decoded information stored in the storage unit 404 may be selectively stored and used according to a situation. After all of the above information is stored in the storage unit, it is not necessary to use the decoding information.

Hereinafter, the detailed description will be made according to the flowchart of FIG. 5.

The broadcast receiving terminal apparatus performs a tuning process of selecting a broadcast signal of a specific channel according to a user's request from a wireless broadcast signal input from the outside (501, 502), and then performs channel decoding on the broadcast signal of the specific channel. And obtain an ensemble (503).

Next, an ensemble demultiplexing (demuxing) process 504 is performed, in which a subchannel is separated from an ensemble by using subchannel identification information (ID) stored in the storage unit 404 (505), and the subchannel. Demultiplex the ensembles using to obtain a transport stream.

Thereafter, an MPEG-2 TS demultiplexing (demuxing) process 506 is performed, in which the PMT is extracted from the transport stream using the PID of the PMT stored in the storage unit 404 (507) and included in the extracted PMT. Extracts the initial object descriptor (IOD) and uses the respective PIDs for the object descriptor (OD) stream / binary form screen information (BIFS) stream / media stream stored in the storage unit 404. The OD stream / BIFS stream / media stream is extracted from the 508.

Next, after the decoding process for decoding the extracted OD stream / BIFS stream / media stream and the initial object descriptor (IOD) is performed (509), the broadcast content is decoded using the decoded OD stream / BIFS stream / media stream. By constructing the scene (510), the screen and sound are output (511).

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

According to the present invention, when the terrestrial DMB viewer first turns on the terminal or changes the channel during viewing, the time required for decoding the content transmitted through the channel can be significantly reduced, and further, the EPG for terrestrial DMB broadcasting It has the effect of providing a way to provide information.

Claims (7)

In the digital multimedia broadcasting (DMB) receiving terminal device, Tuning means for selecting a broadcast signal of a specific channel according to a user's request from a wireless broadcast signal input from the outside; Channel decoding means for obtaining an ensemble by performing channel decoding on the broadcast signal of the specific channel; Decoding information necessary to decode broadcast content of a specific channel selected by a user, including subchannel identification information (ID), PID (packet identifier) of a program map table (PMT), and object descriptor (OD) stream / binary form screen information (BIFS). Storage means for storing a PID of the stream / media stream; After the transport stream is obtained from the ensemble using the stored subchannel identification information (ID), the PID of the stored PMT and the PID of an object descriptor (OD) stream / binary form screen information (BIFS) stream / media stream are used. Ensemble and transport stream demultiplexing means for extracting an initial object descriptor (IOD) and an elementary stream (ES) from the obtained transport stream; Decoding means for decoding the elementary stream and the initial object descriptor (IOD); And Scene composition means for composing a broadcast content scene using the information decoded by the decoding means. DMB receiving terminal device for fast decoding of broadcast content comprising a. The method of claim 1, The storage means, DMB receiving terminal device for high-speed decoding of broadcast content, characterized in that for downloading the decoding information through a wired or wireless communication network. The method of claim 1, The storage means, DMB receiving terminal apparatus for fast decoding of broadcast content, characterized in that the decoding information is stored directly from the user. The method according to any one of claims 1 to 3, The ensemble and transport stream demultiplexing means, Ensemble demultiplexing means for separating a subchannel from the ensemble using subchannel identification information (ID) stored in the storage means, and demultiplexing the ensemble using the subchannel to obtain a transport stream; And Extract the PMT from the transport stream by using the PID of the PMT stored in the storage means, extract the initial object descriptor (IOD) included in the PMT, and each of the OD stream / BIFS stream / media stream stored in the storage means. Transport stream demultiplexing means for separating an OD stream / BIFS stream / media stream from the transport stream using a PID of DMB receiving terminal device for fast decoding of broadcast content comprising a. In the method of receiving digital multimedia broadcasting (DMB), A tuning and channel decoding step of selecting a broadcasting signal of a specific channel from a wireless broadcasting signal input from the outside and obtaining an ensemble by performing channel decoding on the broadcasting signal of the specific channel; An ensemble demultiplexing step of separating a subchannel from the ensemble using subchannel identification information (ID) stored in a storage means, and demultiplexing the ensemble using the subchannel to obtain a transport stream; After extracting the PMT from the transport stream using the PID of the PMT stored in the storage means, an initial object descriptor (IOD) included in the PMT is extracted, and the object descriptor (OD) stream / binary form screen information stored in the storage means. A transport stream demultiplexing step of extracting an OD stream / BIFS stream / media stream from the transport stream using respective PIDs for the (BIFS) stream / media stream; Decoding the OD stream / BIFS stream / media stream and the initial object descriptor (IOD), and decoding and scene construction step for composing a broadcast content scene using the decoded information. DMB receiving method for fast decoding of broadcast content comprising a. The method of claim 5, The storage means, Storing subchannel identification information (ID), PID of program map table (PMT), and PID of OD stream / BIFS stream / media stream, which are necessary to decode broadcast content of a specific channel selected by a user. DMB reception method for fast decoding. The method of claim 6, Decoding information stored in the storage means, DMB receiving method for high-speed decoding of the broadcast content, characterized in that it is stored directly from the user or downloaded through a wired or wireless communication network.

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