KR20070015810A - Digital broadcasting receiving apparatus and method for generating channel map for switching of broadcasting channels - Google Patents

Abstract

According to an embodiment of the present invention, the digital broadcast reception device generates a channel map by searching and databaseting PMT PID, PES PID, and Walsh codes for a plurality of broadcast service channels during a charging period during which a user does not receive digital broadcast. do. Here, since the digital broadcast reception device is connected to a fixed power supply during the charging period, the digital broadcast reception device may generate a channel map without consuming battery power.

Walsh Code, PAT, PMT

Description

Digital broadcasting receiving apparatus and method for generating channel map for switching of broadcasting channels}

1 is a block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention;

2 is a block diagram illustrating a PSI parser of FIG. 1;

3 is a diagram illustrating a control flow for implementing a channel map according to an embodiment of the present invention.

The present invention relates to a digital broadcast receiver, and more particularly, to a method for generating a channel map for switching a broadcast channel and a digital broadcast receiver.

Typically, MPEG (Motion Picture Experts Group) -2 TS (Transport Stream) is used as a transmission standard for satellite digital multimedia broadcasting (DMB). According to the DMB broadcasting standard, the DMB broadcasting channel is a pilot channel for transmitting configuration information of a CDM (Code Division Multiplex) channel including Walsh code information, and a CAS (conditional access system) for transmitting authentication information for receiving DMB broadcasting. A channel, an EPG channel for transmitting information about a service channel, and at least one media channel for transmitting a real transport packet (hereinafter referred to as TS) packet data.

The digital broadcasting center transmits program specific information (PSI) information to the digital broadcast receiving apparatus, and the broadcast receiving apparatus may receive TS data according to a channel selected by a user with reference to program specific information (PSI) information. The PSI information includes a service description table (SDT), a program association table (PAT), and a program map table (PMT). The SDT includes broadcast service channels and related information that is currently being broadcast, and the user can select a desired channel with reference to the SDT. The PAT includes a broadcast channel ID (ID) currently being broadcast and a PID (Packet Identification) of a PMT having additional information of the broadcast channel. The PMT includes PIDs of video and audio TSs corresponding to individual broadcast channels.

That is, in order to output a digital multimedia broadcasting of a predetermined broadcast channel, the digital broadcast reception apparatus needs to know a PID (hereinafter, referred to as Packet Elementary Stream Packet Identification: PES PID) value of TS packet data of the channel. This PES PID can be known by searching the PAT and PMT for the channel ID of the channel selected by the user from the SDT.

Therefore, the digital broadcast reception apparatus can provide the digital multimedia broadcasting service of the channel selected by the user by receiving only TS packet data having the PES PID according to the channel selected by the user. To this end, the digital broadcasting reception apparatus should be able to filter only TS packets having the PES PID of the channel selected by the user from among TS packet data broadcast from the digital broadcasting reception center. Walsh code is used for this purpose.

Here, Walsh Code refers to a set of orthogonal codes. In the MPEG-2 which is a terrestrial DMB transmission standard, Walsh Code is used to filter only TS packet data of a specific channel. The information on the Walsh Code is transmitted through the pilot channel among the five channels of the DMB transmission standard as described above. The digital broadcast reception apparatus receives information on the range of the maximum PID value and the range of the minimum PID value for each of the code division multiplex (CDM) channels from the pilot channel. Therefore, when the user selects any one channel, the digital broadcasting reception apparatus sets the Walsh code value for the corresponding channel to the baseband processor and filters only TS packets having a PES PID corresponding to the maximum minimum PID range of the configured Walsh code. To receive.

That is, the digital broadcast reception apparatus searches for Walsh Code corresponding to PMT PID and PES PID according to the channel selected by the user and sets Walsh Code searched by the baseband processor to receive TS packet data corresponding to the channel selected by the user. You must go through the process.

As described above, in the conventional digital broadcasting receiver, the user has to go through the Walsh Code setting process by analyzing the PAT and PMT every time the user changes the channel, so that the time required for receiving the TS packet data of the channel selected by the user becomes long. There was this.

Therefore, the present invention provides a method for generating a channel map for switching the broadcast channel so that the time required for receiving the TS packet data of the broadcast channel selected by the user when the user switches the broadcast channel in the digital broadcast receiving apparatus and It provides a digital broadcast receiving apparatus for this.

According to an aspect of the present invention, there is provided a method of generating a channel map in a digital broadcast receiving apparatus. And generating a channel map by searching and databaseting PMT PID, PES PID, and Walsh codes for a plurality of broadcast service channels when charging of the digital broadcast reception apparatus is started.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

According to an embodiment of the present invention, the digital broadcast reception device generates a channel map by searching and databaseting PMT PID, PES PID, and Walsh codes for a plurality of broadcast service channels during a charging period during which a user does not receive digital broadcast. do. Here, since the digital broadcast reception device is connected to a fixed power supply during the charging period, the digital broadcast reception device may generate a channel map without consuming battery power. . The PES PID includes a video ID and an audio ID.

The predetermined period during which the user does not receive digital broadcasting is not limited to the period during which the digital broadcasting receiving apparatus is charged.

A block diagram of a digital broadcast receiver according to an embodiment of the present invention will be described with reference to FIG. 1.

1 is a block diagram of a digital broadcast receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the digital broadcast reception apparatus 100 includes a baseband processor 110, a PSI parser 120, a Walsh code setting unit 130, a memory 140, and a channel setting control unit 150. The channel setting control unit 150 controls the baseband processor 110 to receive TS packet data for the channel when the user selects a predetermined broadcast channel. In addition, the channel setting control unit 150 searches and databases the PMT PID, the PES PID, and the Walsh code for a plurality of broadcast service channels during a predetermined period during which the user does not receive digital broadcasting. In other words, the channel setting controller 150 receives the pilot channel, the EPG channel, the CAS channel, and at least one media channel through the baseband processor 110 in a predetermined period during which the user does not receive digital broadcasting. In this embodiment, the channel setting control unit 150 receives the pilot channel, the EPG channel, the CAS channel and at least one media channel through the baseband processing unit 110 during the charging period.

Because the digital broadcast receiver is connected to a fixed power source during charging, it is possible to generate a channel map without consuming battery power.

The baseband processor 110 generates Walsh code MAP including the maximum PID value and the minimum PID value of Walsh code for each CDM channel by using the information on Walsh codes received from the pilot channel and sets Walsh code. Provided to the unit 130. The baseband processor 110 acquires the SDT through the EPG channel. In addition, the baseband processor 110 obtains a PAT through a CAS channel and obtains a PMT through at least one media channel. In this case, since the SDT is for guiding a digital broadcast to a user, it is not directly necessary information when receiving a digital broadcast. As described above, the PAT includes a broadcast channel ID (ID) currently being broadcast and a PID (Packet Identification) of a PMT having additional information of the broadcast channel. The PMT includes PIDs of video and audio TSs corresponding to individual broadcast channels.

The PAT and PMT are input to the PSI parser 120. The PSI parser 120 parses the PAT and PMT to obtain PMT PID and PES PID (Audio PID and Video PID) for each broadcast service channel.

Table 1 shows an example of SDT, and Table 2 shows an example of PAT. Table 3 shows an example of PMT and Table 4 shows an example of Walsh Code MAP.

Channel ID Service channel title 0x01 SF movie channel 0x02 Melodrama channel 0x03 EA sports 0x04 Current Economic News 0x05 Tony bus cartoon ... ...

Channel ID PMT PID 0x01 0x0100 0x02 0x0200 0x03 0x0300 0x04 0x0400 0x05 0x0500 ... ...

PMT PID Stream packet type PES PID 0x0100 video 0x0130 audio 0x0150 0x0200 video 0x0230 audio 0x0250 0x0300 video 0x0330 audio 0x0350 0x0400 video 0x0430 audio 0x0450 0x0500 video 0x0530 audio 0x0550

walsh code Min max PID Walsh Code # 1 Min PID 0x0100 Max PID 0x0199 Walsh Code # 2 Min PID 0x0100 Max PID 0x0199 Walsh Code # 3 Min PID 0x0200 Max PID 0x0299 Walsh Code # 4 Min PID 0x0200 Max PID 0x0299 Walsh Code # 5 Min PID 0x0300 Max PID 0x0399 ... ... ...

The PSI parser 120 provides the obtained PMT PID and PES PID (Audio PID and Video PID) to the Walsh Code setting unit 130 and the memory 140. In more detail, the PSI parser 120 may have a configuration as shown in FIG. 2. Referring to FIG. 2, the PSI parser 120 includes a PAT parser 122 and a PMT parser 124.

The PAT parsing unit 122 parses the PAT and obtains a PMT PID according to a predetermined service channel from the parsed PAT. The PMT parser 124 parses the PMT and acquires PES PIDs (Audio PID and Video PID) according to the PMT PID identified by the PAT parser 122. The PES PID from the PMT parser 124 is provided to the Walsh code setting unit 130. The Walsh code setting unit 130 checks the Walsh code value corresponding to the PES PID from the Walsh code MAP. The Walsh code setting unit 130 provides the checked Walsh Code value to the memory 140. In addition, although not shown in the drawing, the Walsh Code setting unit 130 may set the baseband processing unit 110 to receive a Walsh code for a broadcast channel to be output.

The memory 140 receives PMT PID, PES PID (Audio PID and Video PID) and Walsh Code values for the service channel. Accordingly, the memory 140 stores PMT PID, PES PID (Audio PID and Video PID), and Walsh code for each service channel and makes a database as a channel map. The memory 140 is preferably a nonvolatile memory. Meanwhile, the channel map database implemented in the memory may be configured as shown in Table 5 below.

Channel Map Channel # 1 PMT PID Audio PID Video PID Walsh Code Channel # 2 PMT PID Audio PID Video PID Walsh Code ... ...

Then, if the user selects the SF movie channel, the digital broadcasting receiver according to the present invention is a PMT PID, Audio PID and Video PID and Walsh code corresponding to the SF movie channel selected by the user from the channel map shown in Table 5 Can be obtained. In other words, when the channel setting control unit 150 receives the channel selection signal according to the channel selected by the user, the PMT PID, Audio PID, Video PID, and Walsh code for the channel selected by the user from the channel map implemented in the memory 140. Read and set the Walsh code so that the baseband processing unit 110 can receive the corresponding channel using this.

According to the present invention, a PMT PID, Audio PID, Video PID, Walsh Code corresponding to a channel according to a user's selection is made by using a channel map in which PMT PID, Audio PID, Video PID, and Walsh Code values for each service channel are databased. Since there is no need to retrieve the value, the time required for the user to change the channel can be reduced.

3 is a diagram illustrating a control flow for implementing a channel map according to an embodiment of the present invention.

The digital broadcast reception device 100 generates a channel map in a predetermined period during which the user does not receive digital broadcast. For example, the digital broadcast reception device 100 determines whether it is charged in step 210. If the digital broadcast receiving device 100 is portable, it should be charged periodically, but the user is not likely to watch or listen to digital broadcast while charging the digital broadcast receiving device. Therefore, in the present embodiment, it is assumed that the digital broadcast reception device is charged and a channel map is generated in the charging period. By doing this when charging, there is no need to drain the battery to obtain PMT PID, Audio PID, Video PID and Walsh Code values for each channel. That is, since the digital broadcast reception device is connected to a fixed power supply during the charging period, the digital broadcast reception device may generate a channel map without consuming battery power.

Referring to FIG. 3, when charging starts, the digital broadcast reception device 100 proceeds to step 220 and generates a Walsh Code MAP. In operation 230, the digital broadcast reception device 100 parses the PSI, that is, the PAT and PMT, and analyzes the PAT and PMT in step 240. Accordingly, the digital broadcast reception device 100 obtains the PMT PID, the PES PID (Audio PID and Video PID), and the Walsh code in step 250. The PMT PID is obtained from the PAT, and the Audio PID and the Video PID are obtained from the PMT. And Walsh Code value corresponding to PES PID is obtained from Walsh code MAP. The digital broadcast reception device 100 generates a channel map by storing the PMT PID, the Video PID, the Audio PID, and the Walsh code acquired in step 260 corresponding to the corresponding service channel. The digital broadcast reception apparatus 100 continuously performs steps 220 to 260 until charging is completed, acquires PMT PID, Video PID, Audio PID, and Walsh code for each service channel and generates a channel map.

As described above, the present invention generates a channel map by databaseting PMT PID, Audio PID, Video PID, and Walsh Code values for each service channel in advance.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

In the present invention, by using a channel map that is a database of PMT PID, Audio PID, Video PID, and Walsh Code values for each service channel, PMT PID, Audio PID, Video PID, Walsh Code for the corresponding channel when the channel is changed by the user. There is no need to retrieve the value. Accordingly, when the user changes the channel, the digital broadcast data service according to the channel change can be provided in a shorter time.

Claims (6)

In the method for generating a channel map in the digital broadcast receiver, Determining whether charging of the digital broadcasting receiver is started; And when the charging of the digital broadcasting receiver starts, generating a channel map by searching and databaseting PMT PID, PES PID, and Walsh codes for a plurality of broadcast service channels. The method of claim 1, wherein the channel map generation step Receiving a digital broadcasting channel and generating a Walsh Code MAP having at least one Walsh Code value according to each broadcasting service channel; Receiving and parsing a program association table (PAT) and a program map table (PMT) transmitted through a digital broadcasting channel; Obtaining PMT PID, Audio PID and Video PID from the PAT and PMT; Acquiring Walsh Code values corresponding to the Audio PID and the Video PID from the Walsh Code MAP; And generating a channel map for each broadcast service channel using the PMT PID, Audio PID, Video PID, and Walsh Code values. The method of claim 1, wherein the channel map is implemented on a nonvolatile memory. The method of claim 1, wherein the digital broadcast receiving apparatus refers to the channel map when a broadcast channel is changed by a user. In the digital broadcast receiver, A baseband processor for receiving a digital broadcast channel and generating a Walsh Code MAP having at least one Walsh Code value corresponding to each broadcast service channel; A PSI parsing unit for receiving and parsing a program association table (PAT) and a program map table (PMT) transmitted through the digital broadcasting channel to obtain a Pmt PID, an audio PID, and a video PID; A Walsh code setting unit for obtaining Walsh Code values corresponding to the Audio PID and Video PID from Walsh Code MAP having at least one Walsh Code value corresponding to each broadcasting service channel; A memory for implementing a channel map for each broadcast service channel using the Pmt PID, Audio PID, Video PID, and Walsh Code values; And a channel setting control unit configured to determine whether charging of the digital broadcast reception device is started and to control reception of a digital broadcast channel through the baseband when charging of the digital broadcast reception device is started. 6. The apparatus of claim 5, wherein the memory is a nonvolatile memory.

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