KR20100122306A - Apparatus for receiving a broadcast signal and channel searching method thereof - Google Patents

Abstract

PURPOSE: An apparatus for receiving a broadcast signal and a channel searching method thereof are provided to compensate the errors of the channel information of a broadcasting station by generating a channel reference for configuring a channel map through the combination of each kind of channel information in a program association table with a broadcasting information table. CONSTITUTION: A receiver(110) receives a data stream including a broadcasting signal, and a broadcasting information extractor(120) extracts an SDT(Service Description Table) and a PAT(Program Association Table) from the data stream. A channel map configuration unit(130) generates a channel reference through the combination of second channel information within a program association table with the first channel information within the broadcasting table. The channel map configuration unit configures the channel map based on the channel reference and a PMT(Program Map Table).

Description

Apparatus for receiving a broadcast signal and channel searching method

The present invention relates to a method for searching for a channel in a broadcast receiving device.

In general, the broadcast reception device receives a data stream including a broadcast signal, extracts a video and audio data stream corresponding to a channel desired by a user using service information included in the received data stream, and outputs the stream to the display device.

Digital television receivers, for example, have the ability to convert incoming broadcast signals into digital codes to add high-quality screen playback and add features. In digital broadcasting, video and audio streams are compressed and broadcast as digital information, and system information and program information are compressed and broadcast in accordance with the Program and System Information Protocol (PSIP) standard.

An object of the present invention is to provide a broadcast receiving apparatus and a channel searching method using the same, which can compensate for a loss of channel information to improve an error of channel searching.

In accordance with another aspect of the present invention, a channel search method includes: receiving a data stream including a broadcast signal; Extracting a broadcast information table (SDT) and a program association table (PAT) from the received data stream; Generating a channel reference by combining first channel information included in the broadcast information table (SDT) and second channel information included in the program association table (PAT); And constructing a channel map by using the generated channel reference and program map table (PMT).

In accordance with another aspect of the present invention, a broadcast receiving apparatus includes a broadcast information extracting unit configured to extract a broadcast information table (SDT), a program association table (PAT), and a program map table (PMT) from a data stream; For the combination of the service IDs included in the broadcast information table SDT and the program association table PAT, a packet ID corresponding to each service ID is retrieved from the program map table PMT. A channel map constructing unit constituting the map; And a data extracting unit extracting AV data of a specific channel from the received data stream using the packet ID of the channel map.

According to an embodiment of the present invention, by combining the channel information included in each of the broadcast information table (SDT) and the program association table (PAT) to generate a channel reference for the channel map configuration, the channel information received from the broadcasting station, etc. Errors can be compensated for, thereby improving the accuracy of channel searching.

Hereinafter, a broadcast receiving apparatus and a channel searching method using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a simplified configuration of a broadcast output system for receiving and outputting a data stream including a broadcast signal. The illustrated system may include a broadcast receiving device 100 and a display device 200.

Referring to FIG. 1, the broadcast receiving apparatus 100 receives a data stream including a broadcast signal through a satellite or a cable, and includes a video corresponding to a channel selected by a user from the received data stream. The audio data may be extracted and processed and then output to the display apparatus 200.

For example, in the case of digital broadcasting, video and audio data are compressed into digital information, and system information and program information are compressed according to the Program and System Information Protocol (PSIP) standard to be combined into the data stream together with the compressed video and audio data. It may be generated and transmitted to the broadcast receiving device 100.

The PSIP is a standard for terrestrial and cable digital broadcasting that defines program and system information standards. The PSIP parses signals encoded according to the Moving Picture Experts Group (MPEG) standard and provides various information about a program. It is defined to be.

More specifically, the broadcast receiving device 100 extracts service information from the received data stream and separates various channel information therefrom, and the video and audio data extracted from the data stream. It may include an A / V processing unit (not shown) for decoding.

The display apparatus 200 displays an image using a video signal input from the broadcast receiving apparatus 100. For example, the display apparatus 200 displays an image, for example, a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescent display (ELD), or a VFD. You can display images using various display methods such as (Vacuum Fluorescent Display).

Meanwhile, in FIG. 1, a case where the broadcast receiving device 100 is provided as a separate device outside the display device 200 has been described as an example. However, in the embodiment of the present invention, the broadcast receiving device 100 is the display device 200. It can be implemented as a set included in the inside of).

2 is a block diagram illustrating a configuration of a broadcast receiving apparatus according to an embodiment of the present invention. The illustrated broadcast receiving apparatus includes a receiver 110, a broadcast information extractor 120, a channel map constructer 130, and the like. It may include a data extraction unit 140.

Referring to FIG. 2, the receiver 110 receives a data stream including video and audio data and service information.

According to an embodiment of the present invention, a data stream received from a digital broadcasting center, for example, a broadcasting station, is a service information (SI), a service description table (SDT) and a program association table (PAT). Table) and a Program Map Table (PMT).

The broadcast information table (SDT) may include broadcast service channels of the media channel currently being broadcast and information on the channels, and by referring to the broadcast information table (SDT), a user searches for a channel and a desired channel. Can be selected.

In addition, the program association table (PAT) is a packet ID (PID) of the program map table (PMT) having a broadcast channel ID (ID) currently being broadcast and additional information about the broadcast channel, that is, the broadcast channel's PMT PID may be included.

The program map table PMT may include a packet ID (PID) of each broadcast channel, that is, a video and audio data stream corresponding to the PMT PID.

Meanwhile, the broadcast information table SDT, the program association table PAT, and the program map table PMT may be included in the data stream and may be received by the receiver 110 having different transmission periods.

The broadcast information extractor 120 may extract service information, for example, the broadcast information table SDT, the program association table PAT, and the program map table PMT from the data stream received by the receiver 110. .

The channel map construction unit 130 constructs a channel map by using the extracted broadcast information table SDT, the program association table PAT, and the program map table PMT.

As described above, the extracted broadcast information table SDT and the program association table PAT may each include information on a channel currently being broadcast.

The channel map constructing unit 130 includes information about the first channel information, which is information on currently broadcast channels included in the extracted broadcast information table (SDT), and the currently broadcast channels included in the program association table (PAT). The channel reference for the channel map configuration may be generated by combining the second channel information as the information.

As described above, the channel map configuration unit 130 generates channel criteria by combining channel information included in the broadcast information table SDT and the program association table PAT, respectively, to the broadcast information table SDT transmitted from the broadcasting station. If there is an error, for example, if there is no broadcast information table (SDT) in the data stream, or if there is an error in the service ID included in the extracted broadcast information table (SDT), the program linkage table (PAT) may be used. The included channel information may be used to compensate for the loss of the channel information.

Meanwhile, the channel map constructing unit 130 may construct a channel map by searching the program map table PMT according to the channel criteria generated as described above.

The program map table (PMT) stores an elementary packet ID (PES PID, Packet Elementary Stream Packet Identification Description), which is service information for each of a plurality of broadcast channels and location information for extracting packet data corresponding to the channel. It may include. In addition, the elementary packet ID (PES PID) may include a video packet ID (video PID) and an audio packet ID (Audio PID).

For example, if six generated service IDs (service IDs 1 to 6) are included in the channel currently being broadcast, the channel map configuration unit 130 corresponds to each of the six service IDs. The elementary packet ID (PES PID), more specifically, the video packet ID (video PID) and the audio packet ID (Audio PID) may be searched in the program map table (PMT).

In this case, as shown in FIG. 3, the channel map constructing unit 130 includes the six service IDs, channel names of each service ID, and packet IDs (PID) by a program map table (PMT) search. You can configure the channel map.

The data extractor 140 uses a packet ID of the configured channel map, more specifically, a video packet ID (PID) and an audio packet ID (PID), and the video corresponding to the channel desired by the user from the received data stream. Audio data streams can be extracted.

That is, when a user selects a specific channel among a plurality of channels included in the channel map searched by the above method, the data extractor 140 corresponds to the service ID of the specific channel using the channel map. A video packet ID (PID) and an audio packet ID (PID) may be detected, and video and audio data streams corresponding to the specific channel may be extracted from the received data streams using the detected packet IDs.

Hereinafter, the operation of the broadcast reception device shown in FIG. 2 will be described in more detail with reference to a flowchart illustrating a channel search method according to an embodiment of the present invention shown in FIG. 9.

The receiver 110 receives a data stream including a broadcast signal (step 300), and the broadcast information extractor 120 corresponds to service IDs of channels currently broadcast from the received data stream and channels corresponding to each service ID. In operation 310, a broadcast information table (SDT) including information about a name is extracted.

In addition, the broadcast information extracting unit 120 extracts a program association table (PAT) including service IDs of channels currently being broadcast from the received data stream (step 320).

On the other hand, step 310 of extracting the broadcast information table (SDT) and step 320 of extracting the program linkage table (PAT) may be reversed, that is, the program linkage table (PAT) is a broadcast information table from the data stream It may be extracted before (SDT). In addition, a broadcast information table (SDT) or a program association table (PAT) may not exist in the received data stream. In this case, any one of steps 310 and 320 may be omitted.

The channel map constructing unit 130 generates a channel reference for generating a channel map by combining the service IDs included in the extracted broadcast information table SDT and the service IDs included in the program association table PAT (330). step).

For example, the channel map constructing unit 130 may generate the channel criterion by forming a union of the service IDs included in the extracted broadcast information table SDT and the service IDs included in the program association table PAT. For this, service IDs included in the broadcast information table SDT and the program association table PAT may be compared with each other to detect duplicate service IDs.

FIG. 4 illustrates an embodiment of a configuration of a broadcast information table SDT and a program association table PAT extracted from a data stream.

Referring to FIG. 4, some of the channels on which the broadcast information table SDT is currently being broadcast, for example, channels corresponding to service IDs 4 and 5 may be lost or have an error with an incorrect value.

In addition, a service ID for a specific channel may not exist in the program association table (PAT) transmitted from a broadcasting station, or there may be an error in the service ID value.

In this case, the channel map constructing unit 130 constructs a union of the service IDs included in the broadcast information table SDT and the service IDs included in the program linkage table PAT to form a service ID as shown in FIG. 5. It is possible to create a channel reference including the.

Referring to FIG. 5, the channel reference includes all service IDs for channels included in at least one of the broadcast information table (SDT) and the program association table (PAT). You can prevent it from being searched.

On the other hand, since the program association table (PAT) does not include the information on the channel name, channels existing only in the program association table (PAT) among the channels included in the channel criteria, for example, channels corresponding to service IDs 4 and 5 Channel names may not exist.

In addition, the broadcast information table SDT may not exist in the received data stream. In this case, the channel map constructing unit 130 may generate a channel reference using only the program linkage table PAT extracted from the data stream. It may be.

For example, assuming that only the program association table PAT shown in FIG. 4 is extracted, the generated channel criteria may include only service IDs 1 to 7 included in the program association table PAT, and all channels. Information about the channel name for may not be provided to the user.

When the channel criterion is generated as described above, the channel map constructing unit 130 searches the program map table PMT according to the generated channel criterion to construct a channel map (step 340).

For example, the channel map construction unit 130 searches for the video and audio packet IDs (PIDs) corresponding to the corresponding service IDs for each of the service IDs included in the channel criteria, and searches the program map table (PMT). In addition, a channel map including service IDs currently being broadcast, a channel name corresponding to each service ID, and a video / audio packet ID (PID) may be configured.

FIG. 6 illustrates an embodiment of a channel map configured according to the channel reference shown in FIG. 5.

Referring to FIG. 6, the channel map constructing unit 130 may include video and audio packet IDs (PIDs) corresponding to each of the eight service IDs (service IDs 1 to 8) included in the channel reference of FIG. 5. PID 1 to 8 and audio PID 1 to 8 may be searched in the program map table PMT and corresponded with the channel names to form a channel map.

However, as shown in FIG. 6, the channel names may not exist for the service IDs (service IDs 4 and 5) existing only in the program linkage table (PAT) among the configured channel maps. In this case, only the video and audio data corresponding to the channel may be output without displaying the channel name through the display apparatus 200.

In this case, as shown in FIG. 7, the channel map constructing unit 130 uses virtual channel names Vch 4 and Vch 5 for channels that do not have channel names, for example, channels corresponding to service IDs 4 and 5. ) Can be given.

Accordingly, in the broadcast reception device according to the embodiment of the present invention, even when a channel does not include information in the broadcast information table (SDT), the program association table (PAT) enables the search and at the same time a user is selected. It may also be possible to display the channel name for identifying the channel.

Meanwhile, some service IDs among the service IDs included in the channel reference may not exist in the program map table (PMT), and in this case, channel information corresponding to the corresponding service ID may not be included in the channel map.

That is, when service ID 8 among the channels shown in FIG. 5 does not exist in the program map table PMT, as shown in FIG. 8, information about a channel corresponding to service ID 8 may not be included in the channel map. Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

1 is a block diagram schematically illustrating a configuration of a broadcast output system for receiving and outputting a data stream including a broadcast signal.

2 is a block diagram showing the configuration of a broadcast receiving apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a channel map configured in the broadcast reception device.

4 is a diagram illustrating an embodiment of a configuration of a broadcast information table (SDT) and a program association table (PAT) extracted from a data stream.

FIG. 5 is a diagram illustrating an embodiment of a channel reference generated by combining the broadcast information table SDT and the program association table PAT shown in FIG. 4.

6 to 8 are diagrams illustrating embodiments of a channel map configured according to the channel reference illustrated in FIG. 5.

9 is a flowchart illustrating a channel search method according to an embodiment of the present invention.

Claims (10)

Receiving a data stream comprising a broadcast signal; Extracting a broadcast information table (SDT) and a program association table (PAT) from the received data stream; Generating a channel reference by combining first channel information included in the broadcast information table (SDT) and second channel information included in the program association table (PAT); And And constructing a channel map using the generated channel criteria and program map table (PMT). The method of claim 1, wherein the channel reference generating step And comparing the service IDs included in the broadcast information table (SDT) with the service IDs included in the program association table (PAT) to detect duplicate service IDs. The method of claim 1, wherein the channel reference generating step And a service ID included in the broadcast information table (SDT) and a service ID included in the program association table (PAT). The method of claim 1, wherein the channel reference generating step And if the broadcast information table (SDT) does not exist in the received data stream, generating the channel reference using service IDs included in the program association table (PAT). The method of claim 1, wherein the channel map configuration step And retrieving a packet ID (PID) corresponding to a service ID included in the channel criterion from the program map table (PMT). The method of claim 1, wherein the channel map The channel search method of the service ID existing only in the second channel information among the first and second channel information does not include information on the channel name. The method of claim 6, And assigning a virtual channel name to a service ID existing only in the second channel information. In the broadcast receiving device for receiving a data stream including a broadcast signal, A broadcast information extraction unit for extracting a broadcast information table (SDT), a program association table (PAT), and a program map table (PMT) from the received data stream; For a combination of service IDs included in the broadcast information table SDT and the program association table PAT, a packet ID corresponding to each service ID is retrieved from the program map table PMT. A channel map constructing unit constituting the map; And And a data extractor configured to extract AV data of a specific channel from the received data stream using the packet ID of the channel map. The method of claim 8, wherein the channel map configuration unit And a channel map using a combination of service IDs included in the broadcast information table (SDT) and service IDs included in the program association table (PAT). The method of claim 8, wherein the channel map configuration unit And when the broadcast information table (SDT) does not exist in the received data stream, constructing the channel map by using service IDs included in the program association table (PAT).

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