JP2009284353A - Receiver and receiving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver and receiving method for monitoring extinguishment of a section and reducing redundant data transfer to a memory and redundant data analysis by a processor. <P>SOLUTION: The receiver includes: a monitor flag storage section 181; a filter information storage section 157 for storing a last version number; a filter processing section 182 in which when a section included in received data is input, a monitor flag is cleared, a version number included in the section is compared with the last version number, and the section is discarded when matched, or the section is transferred to a memory 172 when not matched; and a processor 171 which is configured to obtain the section from the memory 172, monitors the monitor flag at predetermined time intervals and resets the monitor flag when the monitor flag is cleared, or detects that the section is extinguished when the monitor flag is set. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a receiving apparatus and a receiving method. Specifically, the present invention relates to a receiving apparatus and a receiving method for monitoring disappearance of a section included in received data.

  In the MPEG2-System (Moving Picture Experts Group 2-System) standard, a program stream (PS) in which one program (program) is configured in one stream, and a plurality of programs (programs) are included in one stream. A configured transport stream (TS) is used. The transport stream is configured by including a plurality of TS packets, and the data portion of the TS packet includes a section. The data including the section is retransmitted periodically, and the version number described in the section header changes when the section contents are updated.

  Conventionally, a demultiplexer has a technique for performing section filtering processing by setting a filter so that it can be detected that a version number described in a section header has been updated (see, for example, Patent Document 1). In this technique, when section filtering is performed, the same version number as the already acquired section is designated. Then, the specified version number is compared with the version number described in the section header of the section included in the received data. If the version numbers match, the content of the already acquired section is duplicated. Therefore, by filtering, the section included in the received data is discarded as a redundant section.

JP 2000-307968 A

  However, in actuality, in a predetermined section such as PAT (Program Association Table), PMT (Program Map Table), etc., the version number mismatch is not set as a filter condition in the demultiplexer. After the demultiplexer acquires the data every time, the data is transferred to the memory via the memory bus, and the control unit (processor) acquires the data from the memory and performs filtering. The reason for performing such processing is that the processor cannot distinguish between the case where the section is discarded by filtering by the demultiplexer and the case where the section no longer exists in the transport stream. Here, the section no longer exists in the transport stream means that the section has disappeared. For example, if there is no PAT in the transport stream, the receiving apparatus determines that there is no receivable stream or that the transmission system is not operating normally (ARIB TR-B14, Volume 4, Table Operation). Details 30.1).

  According to such a technique, the disappearance of the section can be monitored in the processor, but since there is no filtering in the demultiplexer, there is a problem that redundant data transfer to the memory is performed. In addition, when the processor receives a notification that data has been transferred to the memory, there is a problem in that redundant processing is performed to acquire and analyze data from the memory in order to monitor the disappearance of the section. .

  The present invention has been made in view of the above problems, and an object of the present invention is to monitor the disappearance of a section included in received data, and to perform redundant data transfer to a memory and a processor. It is an object of the present invention to provide a new and improved receiving apparatus and receiving method capable of reducing redundant data analysis.

  In order to achieve the above object, according to an aspect of the present invention, a monitoring flag storage unit stores a monitoring flag in which a value indicating that a section, which is predetermined information included in received data, has disappeared is set. When the filter information storage unit that stores the previous version number indicating the version of the section included in the previously received data and the section included in the received data are input, the monitoring flag is cleared, Determines whether the version number contained in the section matches the previous version number. If it is determined that it matches, the section is discarded, and if it does not match, the section is transferred to memory. Sections can be acquired from the filter processing unit and memory, and the monitoring flag is monitored every predetermined time. If it is determined that the monitoring flag is cleared in, the monitoring flag is reset, and if it is determined that the monitoring flag is set, a control unit that detects that the section has disappeared, and A receiving device is provided.

  In addition, the reception device further includes a display processing unit that generates a message indicating that the section has disappeared and outputs the message to the video upon receiving a notification from the control unit that the section has disappeared. It is good as well.

  In order to achieve the above object, according to another aspect of the present invention, when a section, which is predetermined information included in received data, is input to the filter processing unit, the section is deleted. Clears the monitoring flag stored in the monitoring flag storage unit that stores the monitoring flag in which the indicated value is set, and indicates the version number included in the section and the version of the section included in the previously received data It is determined whether or not the previous version number stored in the filter information storage unit that stores the previous version number matches.If it is determined to match, the section is discarded. The step of transferring the section to the memory, and the control unit capable of acquiring the section from the memory are monitored flags every predetermined time. Monitoring and resetting the monitoring flag if it is determined that the monitoring flag is cleared in the monitoring result, and detecting that the section has disappeared if it is determined that the monitoring flag is set And a receiving method is provided.

  According to the present invention, it is possible to monitor the disappearance of a section included in received data, and it is possible to omit redundant data transfer to a memory and redundant data analysis by a processor, and a receiving apparatus and a receiving method Can be provided.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a diagram illustrating a configuration of a general receiving apparatus. With reference to FIG. 1, the structure of a general receiving apparatus will be described.

  The receiving device 10 is a device that receives a signal from the outside, and is, for example, a digital broadcast receiving device. As shown in FIG. 1, the receiving apparatus 10 includes an antenna 110, a tuner 120, a demodulator 130, a descrambler 140, a demultiplexer 150, an MPEG video decoder 160, and an MPEG audio decoder 161. . The receiving device 10 includes a bus 170, a processor 171, and a memory 172.

  The antenna 110 receives a signal from the outside and outputs it to the tuner 120. Here, the signal is an RF (Radio Frequency) signal.

  The tuner 120 receives a signal having a frequency (program) designated by the user and outputs the signal to the demodulator 130.

  The demodulator 130 performs digital demodulation processing such as A / D (Analog to Digital) conversion and error correction processing on the signal input from the tuner 120. The demodulator 130 outputs the data acquired by demodulation to the descrambler 140. Here, the data acquired by demodulation is, for example, data in the MPEG2-TS format, for example, transport stream data.

  The descrambler 140 solves the scramble applied to the data part of the data (received data) input from the demodulator 130 and outputs the solved data to the demultiplexer 150. Taking Japanese digital broadcasting as an example, the data portion of the TS packet is scrambled by Multi2. Therefore, for example, when descrambler 140 receives transport stream data from demodulator 130, descrambler 140 unscrambles the data portion and outputs the result to demultiplexer 150. As described above, the descrambler 140 is necessary when the data portion of the TS packet is scrambled. The TS packet will be described later with reference to FIG.

  The demultiplexer 150 separates predetermined data from the data (received data) input from the descrambler 140. When the multiplexed TS packet is input from the descrambler 140, the demultiplexer 150 separates a predetermined packet from the input TS packets. The compressed video data obtained by the separation is output to the MPEG video decoder 160, and the compressed audio data obtained by the separation is output to the MPEG audio decoder 161. Further, the demultiplexer 150 transmits PSI (Program Specific Information) data obtained by the separation to the memory 172 via the bus 170.

  The MPEG video decoder 160 decodes the compressed video data input from the demultiplexer 150, generates video data, and outputs the video based on the video data to a video that is output.

  The MPEG audio decoder 161 decodes the audio compression data input from the demultiplexer 150, generates audio data, and outputs the audio based on the audio data as audio.

  The bus 170 is a path used when the demultiplexer 150, the processor 171, the memory 172, and the like exchange data.

  The processor 171 functions as an example of a control unit. For example, the processor 171 includes a CPU (Central Processing Unit), and realizes the function by executing a program stored in the memory 172.

  The memory 172 stores data, and is configured by, for example, a RAM (Random Access Memory).

  FIG. 2 is a diagram illustrating a configuration of a general demultiplexer. The configuration of a general demultiplexer will be described with reference to FIG.

  The TS interface unit 151 receives data input from the descrambler 140 and outputs the input data to the PID filter unit 152.

  The PID filter unit 152 includes a PID comparison unit 153 and a PID extraction unit 154. When the PID filter unit 152 determines that the data input from the TS interface unit 151 is a TS packet to be extracted as a result of the comparison by the PID comparison unit 153, the data is output to the output destination corresponding to the format of the TS packet. Is output.

  The PID filter unit 152 outputs the TS packet input from the TS interface unit 151 to the PES parser unit 158 when the TS packet determined to be extracted includes data in PES format such as video or audio. To do. In addition, when the TS packet determined to be extracted includes the data (section) in the section format, the PID filter unit 152 outputs the TS packet input from the TS interface unit 151 to the section filter unit 155. To do. The section format will be described later with reference to FIG. Further, when the TS packet determined to be extracted includes data in the PCR format, the PID filter unit 152 outputs the TS packet input from the TS interface unit 151 to the PCR parser unit 159.

  The PID extraction unit 154 extracts a PID value from the data input from the TS interface unit 151 and outputs the extracted PID value to the PID comparison unit 153. When a multiplexed TS packet is input from the TS interface unit 151, the PID extraction unit 154 extracts a PID value from the TS packet and outputs the extracted PID value to the PID comparison unit 153. To do.

  The PID comparison unit 153 compares the PID value input from the PID extraction unit 154 with the PID value corresponding to the TS packet to be extracted. The PID value corresponding to the TS packet to be extracted is set in the PID comparison unit 153 in advance by the host (processor 171 (see FIG. 1)).

  When a TS packet is input from the PID filter unit 152, the PES parser unit 158 converts the compressed video data into the MPEG video decoder 160 and the compressed audio data into the MPEG audio decoder 161 as PES format data from which the TS header has been removed. Output.

  When the TS packet is input from the PID filter unit 152, the PCR parser unit 159 outputs the data to the STC (System Time Clock) control unit 162 as PCR-format data from which the TS header has been removed.

  The section filter unit 155 includes a filter processing unit 156 and a filter information storage unit 157.

  When the TS packet is input from the PID filter unit 152, the filter processing unit 156 determines whether the section included in the TS packet is the acquisition target section based on the filter information stored in the filter information storage unit 157. Is to choose. The selected TS packet is transferred to and stored in the memory 172 as section format data (section) from which the TS header is removed.

  The filter information storage unit 157 stores filter information. The filter information will be described later with reference to FIGS.

  FIG. 3 is a diagram illustrating a configuration example of data input to the demultiplexer. An example of data input to the demultiplexer will be described with reference to FIG.

  As shown in FIG. 3, the TS packet 200 input to the demultiplexer 150 is formed of a fixed-length packet of 188 bytes, for example. The TS packet 200 includes synchronization information 210 indicating the head of the packet, and includes a packet identification number (PID 214) made up of, for example, 13 bits at a fixed position of the packet. The PID 214 is assigned to classify what kind of data the data included in the data portion 218 of the TS packet 200 is. For example, if 0x0000 is set in the PID 214, it indicates PAT data, and if 0x0001 is set, it indicates CAT (Conditional Access Table) data. For example, the data portion 218 of the TS packet 200 includes a section.

  In addition, although each item contained in TS packet 200 is demonstrated, it is not specifically limited about which combination is included among these items.

  The transport error indicator 211 is a flag indicating the presence / absence of a bit error in the TS packet 200.

  The payload unit start indicator 212 indicates that, for example, when 1 is set, the start point of the payload of the TS packet 200 is the start point or pointer of the PES packet.

  The transport priority 213 is a flag indicating the priority among packets having the same PID 214 value.

  The transport scramble control 215 is an area used to identify the scramble mode of the payload of the TS packet 200.

  The adaptation field control 216 is an area used to indicate the configuration of the adaptation field part / data part 218.

  The continuity index 217 is an area for designating the order of TS packets 200 having the same PID 214 value.

  The adaptation field unit 218 is an ITU-T (International Telecommunication Union Communication Standardization Sector) recommendation H.264. It is set according to 222.0.

  FIG. 4 is a diagram illustrating an example of a section format. The section format will be described with reference to FIG. Here, the section is predetermined information included in the received data, and is, for example, information (PSI) for selecting a predetermined program, service information (SI) related to the program, or the like. The section format is a section data format.

As shown in FIG. 4, the section format includes, for example, a normal format (see FIG. 4A), an expanded format (see FIG. 4B), and the like. In order to distinguish these, the section syntax instruction 312 is defined as 0 for the normal format and 1 for the extended format. In the MPEG2-TS standard, data such as PAT and PMT are defined in an extended format. In the section of the extended format, 8 bytes from the table identifier 311 to the final section number 320 are used as a section header, and the section filter unit 155 performs filtering of the 8-byte section header.

  In addition, although each item contained in a section format is demonstrated, it is not specifically limited about which combination is included among these items.

  The normal format (see FIG. 4A) includes a table identifier 311, a section syntax instruction 312, an unused area 313, a section length 314, and a table identifier extension 315. These will be described.

  The table identifier 311 is an area used for identifying the table (section type) to which the section belongs. For example, if 0x00 is set in the table identifier 311, it indicates a PAT section.

  The unused area 313 is an area that is not used. For example, it is determined that 111 is set.

  The section length 314 is an area in which the number of data bytes following the section length area is written.

  Data 321 is an area where data is written.

  In the extended format (see FIG. 4B), in addition to the items included in the normal format (see FIG. 4A), a table identifier extension 315, a non-use area 316, a version number 317, a current next instruction 318, a section Number 319, final section number 320 and CRC 322 are included. These will be described.

  The table identifier extension 315 is an area where the table identifier 311 is extended.

  The unused area 316 is an area that is not used. For example, it is determined that 111 is set.

  The version number 317 is an area in which the version number of the table is written. The same number is set for sections with the same content, and the number for which a content has been updated is different from the number set for the section before the update (for example, a number obtained by adding 1). ) Is set.

  The current next instruction 318 is, for example, 1 when the table is currently usable, and 0 when the table indicates that the table is currently unusable and becomes valid next time.

  The section number 319 is an area in which section numbers constituting the table are written.

  The last section number 320 is an area in which the last section number constituting the table is written.

  CRC (Cyclic Redundancy Check) 322 is an ITU-T (International Telecommunication Union Telecommunication Standardization Sector) recommendation. This is a cyclic redundancy check code added according to 222.0.

  FIG. 5 is a diagram schematically illustrating an example of a general section filtering process. An example of general section filtering will be described with reference to FIG. 5 (see FIG. 2 as appropriate).

  As illustrated in FIG. 5, the filter information stored in the filter information storage unit 157 includes, for example, a filter pattern 420, a match pattern 430, a mismatch pattern 440, and a mask pattern 450.

  Input data 410 indicates a section header (see FIG. 4B) multiplexed in the TS packet 200 (see FIG. 3), and is extracted by the section filter unit 155.

  The filter pattern 420 is information to be subjected to a match comparison or a mismatch comparison with the input data 410 in the filter processing by the filter processing unit 156.

  The match pattern 430 is information used to select comparison between data set in the filter pattern 420 by matching.

  The mismatch pattern 440 is information used to select comparison of data set in the filter pattern 420 with a mismatch.

  The mask pattern 450 is information used for selecting whether or not the data set in the filter pattern 420 is compared.

  On the coincidence comparison side, the filter processing unit 156 extracts data for performing coincidence detection from the input data 410. In addition, the filter processing unit 156 extracts data for performing coincidence detection from the filter pattern 420. The filter processing unit 156 determines that the result is satisfied when the two data match, and is not satisfied when the data does not match.

  On the side where the mismatch comparison is performed, the filter processing unit 156 extracts data for performing mismatch detection from the input data 410. In addition, the filter processing unit 156 extracts data for performing mismatch detection from the filter pattern. The filter processing unit 156 determines that the result is not satisfied when the two data match, and is satisfied when the data does not match. However, the result of the mismatch comparison is considered to be true only when no mismatch comparison is performed.

  If both the side performing the coincidence comparison and the side performing the non-coincidence comparison are successful, the section is determined to be acquired. In other cases, it is determined that the section should be discarded. Section filtering is performed when a TS packet in which section format data (section) is embedded is input to the section filter unit 155. If the section is acquired as a result of filtering, the filter processing unit 156 notifies the processor 171 that the section has been acquired. When the section is discarded, the filter processing unit 156 does not notify the processor 171 in principle.

  FIG. 6 is a diagram illustrating a filter setting example of a general section. A general section filter setting example will be described with reference to FIG. 6 (see FIG. 2 as appropriate).

  FIG. 6A shows an example of filter setting when detecting that the contents of a section are updated. A filter condition for comparing coincidence is set for data unique to each table such as the table identifier 311. In order to detect that the contents of the section have been updated by the version number 317, a filter condition for comparing the mismatch is set in the data of the version number 317.

  FIG. 6B shows a filter setting example when monitoring the disappearance of a section. Set a filter condition for comparing only the unique data for each table.

  FIG. 7 is a flowchart showing the flow of a general section filter processing example, and shows the flow of the filter processing when the section filter is set as shown in the filter setting example shown in FIG. It is a flowchart. With reference to FIG. 7 (refer to FIGS. 2 and 6 as appropriate), an example of section filtering performed by a general filter processing unit will be described.

  When receiving an input of a TS packet from the PID filter unit 152 (step S101), the filter processing unit 156 starts a section filter (step S102). Subsequently, the filter processing unit 156 determines whether or not the table identifiers 311 match (step S103). In this determination, the table identifier 311 in the TS packet is compared with the table identifier 311 set in the filter pattern 420 stored in the filter information storage unit 157. If it is determined that they do not match (“NO” in step S103), the filter processing unit 156 discards the section in the TS packet (step S107) and returns to step S101.

  If it is determined that they match (“YES” in step S103), the filter processing unit 156 determines whether the version numbers match (step S104). In this determination, the version number 317 in the TS packet is compared with the version number 317 set in the filter pattern 420 stored in the filter information storage unit 157. If it is determined that they match (“YES” in step S104), the filter processing unit 156 discards the section (step S107) and returns to step S101. Here, the section is discarded because it can be determined that the content of the section in the TS packet has not been updated from the content of the section in the TS packet input last time by matching the version numbers.

  If it is determined that they do not match (“NO” in step S104), the filter processing unit 156 acquires a section (step S105), transfers the data to the memory 172 (step S106), and returns to step S101. Here, the section is acquired because it can be determined that the contents of the section in the TS packet are updated from the contents of the section in the TS packet input last time due to the mismatch of the version numbers. The filter processing unit 156 obtains the section, stores the version number in the TS packet as the previous version number indicating the version of the section included in the previously received data, and uses it for the subsequent comparison. The storage destination is the version number 317 set in the filter pattern 420 stored in the filter information storage unit 157. The data transferred here is, for example, section format data (section) from which the TS header is removed. The filter processing unit 156 may notify the processor 171 that the data has been transferred to the memory 172 together with the transfer of the data.

  According to the above processing, when the content of the section included in the received data has not been updated since the previous time, it is not necessary to transfer data to the memory 172. Further, since the data transferred to the memory 172 is the data in which the section contents are updated, it is not necessary for the processor 171 to analyze whether or not the section contents have been updated. Therefore, redundant data transfer to the memory 172 and redundant data analysis by the processor 171 can be reduced. However, in the processor 171, it cannot be specified whether the cause of the data not being transferred to the memory 172 is the section discard by the filter processing unit 156 or the section disappearance.

  FIG. 8 is a flowchart showing the flow of a general section filter processing example, and shows the flow of the filter processing when the section filter is set as shown in the filter setting example shown in FIG. 6B. It is a flowchart. With reference to FIG. 8 (see FIGS. 2 and 6 as appropriate), an example of section filtering performed by a general filtering unit will be described.

  When receiving an input of a TS packet from the PID filter unit 152 (step S201), the filter processing unit 156 starts a section filter (step S202). Subsequently, the filter processing unit 156 determines whether or not the table identifiers 311 match (step S203). In this determination, the table identifier 311 in the TS packet is compared with the table identifier 311 set in the filter pattern 420 stored in the filter information storage unit 157. If it is determined that they do not match (“NO” in step S203), the filter processing unit 156 discards the section in the TS packet (step S206) and returns to step S201.

  If it is determined that they match (“YES” in step S203), the filter processing unit 156 acquires a section (step S204), transfers the data to the memory 172 (step S205), and returns to step S201. The data transferred here is, for example, section format data (section) from which the TS header is removed. Further, the filter processing unit 156 notifies the processor 171 that the data has been transferred to the memory 172 along with the transfer of the data.

  According to the above processing, if the section acquisition notification from the filter processing unit 156 to the processor 171 is performed within a predetermined period, the processor 171 can determine that the section has not disappeared. The section acquired by the processor 171 is analyzed by software, and is discarded when the version numbers match. However, even if the content of the section included in the received data has not been updated since the previous time, the data is transferred to the memory 172. Further, the processor 171 needs to analyze whether or not the contents of the section have been updated. Therefore, redundant data transfer to the memory 172 and redundant data analysis by the processor 171 are performed.

  FIG. 9 is a diagram illustrating a configuration of the demultiplexer according to the present embodiment. The configuration of the demultiplexer according to this embodiment will be described with reference to FIG.

  Compared with the general demultiplexer 150 shown in FIG. 2, the demultiplexer 150 shown in FIG. 9 has a monitoring flag storage unit 181 added thereto, and the filter processing unit 182 includes a filter processing unit 156 (see FIG. 2). Is different.

  The monitoring flag storage unit 181 stores a monitoring flag. This monitoring flag is set to a value indicating whether or not a section which is predetermined information included in the received data has disappeared. Here, 1 is used as a value indicating that the section has disappeared, but the value is not limited to this value. Further, although 0 is used here as a value indicating that the section has not disappeared, it is not limited to this value. Here, the monitoring flag storage unit 181 exists inside the section filter unit 180, but may be present anywhere as long as it can be read and written by the filter processing unit 182 and the processor 171. Moreover, the monitoring flag is prepared for each PID, for example.

  The filter information storage unit 157 stores at least a previous version number indicating a version of a section included in previously received data. In addition to the previous version number, a table identifier corresponding to the section to be acquired may be stored.

  When the section included in the received data is input, the filter processing unit 182 clears the monitoring flag and determines whether the version number included in the section matches the previous version number. is there. The filter processing unit 182 discards the section when it is determined that they match, and transfers the section to the memory 172 when it determines that they do not match.

  The processor 171 can acquire a section from the memory 172, and monitors a monitoring flag every predetermined time. The processor 171 resets the monitoring flag when it is determined that the monitoring flag is cleared in the monitoring result, and detects that the section has disappeared when it is determined that the monitoring flag is set. . The predetermined time is, for example, 1 second, 2 seconds, or the like, but is not particularly limited. When the processor 171 detects that the section has disappeared, the processor 171 may perform a predetermined process when the section disappears. For example, the receiving device 10 further includes a display processing unit (not shown), and when the display processing unit (not shown) receives a notification from the processor 171 that the section has disappeared, it creates a message indicating that the section has disappeared. It is good also as outputting to a video. The message is, for example, “There is no program currently being broadcast”, but is not limited thereto. The display processing unit (not shown) is located, for example, between the MPEG video decoder 160 (see FIG. 1) and the video.

  FIG. 10 is a flowchart showing the flow of a section filtering process example according to this embodiment. With reference to FIG. 10 (refer to FIG. 9 as appropriate), an example of section filter processing performed by the filter processing unit according to the present embodiment will be described.

  When receiving the input of the TS packet from the PID filter unit 152 (step S301), the filter processing unit 182 starts section filtering (step S302). Subsequently, the filter processing unit 182 determines whether or not the table identifiers 311 match (step S303). In this determination, the table identifier 311 in the TS packet is compared with the table identifier 311 stored in the filter information storage unit 157. If it is determined that they do not match (“NO” in step S303), the filter processing unit 182 discards the section in the TS packet (step S309) and returns to step S301.

  If it is determined that they match (“YES” in step S303), the filter processing unit 182 clears the monitoring flag (step S305), and proceeds to step S306. Clearing the monitoring flag means setting a value (for example, 0) indicating that the section has not disappeared in the monitoring flag stored in the monitoring flag storage unit 181.

  Subsequently, the filter processing unit 182 determines whether or not the version numbers match (step S306). In this determination, the version number 317 in the TS packet is compared with the version number 317 stored in the filter information storage unit 157. If it is determined that they match (“YES” in step S306), the filter processing unit 182 discards the section (step S309) and returns to step S301. Here, the section is discarded because it can be determined that the content of the section in the TS packet has not been updated from the content of the section in the TS packet input last time by matching the version numbers.

  If it is determined that they do not match (“NO” in step S306), the filter processing unit 182 acquires a section (step S307), transfers the data to the memory 172 (step S308), and returns to step S301. Here, the section is acquired because it can be determined that the contents of the section in the TS packet are updated from the contents of the section in the TS packet input last time due to the mismatch of the version numbers. The filter processing unit 182 acquires the section, stores the version number in the TS packet as the previous version number indicating the version of the section included in the previously received data, and uses it for the subsequent comparison. The data transferred here is, for example, section format data (section) from which the TS header is removed. The filter processing unit 182 may notify the processor 171 that the data has been transferred to the memory 172 together with the transfer of the data.

  FIG. 11 is a flowchart showing a flow of a processing example of section disappearance monitoring by the processor according to the present embodiment. With reference to FIG. 11 (refer to FIG. 9 as appropriate), a processing example of section disappearance monitoring performed by the processor according to the present embodiment will be described.

  The processor 171 initializes the monitoring flag (step S401) and enables the section filter (step S402). In this initialization, the monitoring flag stored in the monitoring flag storage unit 181 has a value indicating that the section has not disappeared (for example, 0) or a value indicating that the section has disappeared (for example, 1). Set. Subsequently, when the monitoring timing comes (step S403), the processor 171 determines whether or not the monitoring flag is cleared (step S404). In this determination, it is determined whether or not a value (for example, 0) indicating that the section has not disappeared is set in the monitoring flag stored in the monitoring flag storage unit 181.

  If the processor 171 determines that the monitoring flag is cleared (“YES” in step S404), the processor 171 resets the monitoring flag (step S405), and returns to step S403. To reset the monitoring flag is to reset a value (for example, 1) indicating that the section has disappeared to the monitoring flag stored in the monitoring flag storage unit 181. If it is determined that the monitoring flag is not cleared (“NO” in step S404), the disappearance of the section is detected (step S406), and the process returns to step S403.

  FIG. 12 is a schematic diagram showing a state of section disappearance monitoring according to the present embodiment. With reference to FIG. 12, the section disappearance monitoring according to the present embodiment will be described.

  The processor 171 looks at the monitoring flag at the section monitoring timing. If the monitoring flag is cleared, it is determined that the section has not disappeared, and the monitoring flag is set. On the other hand, if the monitoring flag remains set, it is determined that the section has not reached during the monitoring period, and the disappearance of the section is detected.

  According to this embodiment, when the content of the section included in the received data has not been updated since the previous time, there is no need to transfer data to the memory 172. Further, since the data transferred to the memory 172 is the data in which the section contents are updated, it is not necessary for the processor 171 to analyze whether or not the section contents have been updated. Therefore, redundant data transfer to the memory 172 and redundant data analysis by the processor 171 can be reduced. Further, the processor 171 can detect the disappearance of the section by referring to the value set in the monitoring flag.

  As a result, the load on the processor 171 is reduced, and the processor processing can be used for other applications. Further, since it is possible to monitor the disappearance of the section without transferring the section having the same version number to the memory 172, it is possible to increase the bandwidth used for data transfer of other applications and the like. .

  In the above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

It is a figure which shows the structure of a general receiver. It is a figure which shows the structure of a general demultiplexer. It is a figure which shows the structural example of the data input into a demultiplexer. It is a figure which shows an example of a section format. It is a figure which shows typically the example of filter processing of a general section. It is a figure which shows the filter setting example of a general section. It is a flowchart which shows the flow of the filter process example of a general section. It is a flowchart which shows the flow of the filter process example of a general section. It is a figure which shows the structure of the demultiplexer concerning this embodiment. It is a flowchart which shows the flow of the example of filter processing of the section which concerns on this embodiment. It is a flowchart which shows the flow of the process example of the section disappearance monitoring by the processor which concerns on this embodiment. It is a schematic diagram which shows the mode of the section disappearance monitoring which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Receiving device 110 Antenna 120 Tuner 130 Demodulator 140 Descrambler 150 Demultiplexer 155 Section filter unit 156 Filter processing unit 157 Filter information storage unit 171 Processor (control unit)
172 Memory 180 Section filter unit 181 Monitoring flag storage unit 182 Filter processing unit 200 TS packet 311 Table identifier 317 Version number

Claims (3)

A monitoring flag storage unit for storing a monitoring flag in which a value indicating that a section, which is predetermined information included in received data, has disappeared, is set;
A filter information storage unit for storing a previous version number indicating the version of the section included in the previously received data;
When the section included in the received data is input, the monitoring flag is cleared, and it is determined whether the version number included in the section matches the previous version number. If this is the case, discard the section, and if it is determined that they do not match, a filter processing unit that transfers the section to the memory;
The section can be acquired from the memory, the monitoring flag is monitored every predetermined time, and when it is determined that the monitoring flag is cleared in the monitoring result, the monitoring flag is reset, If it is determined that the monitoring flag is set, a control unit that detects that the section has disappeared;
A receiving device. The display processing unit according to claim 1, further comprising: a display processing unit that generates a message indicating that the section has disappeared and outputs the message to a video when receiving a notification that the section has disappeared from the control unit. Receiver. When a section that is predetermined information included in the received data is input, the filter processing unit is stored in a monitoring flag storage unit that stores a monitoring flag in which a value indicating that the section has disappeared is set. The previous time stored in the filter information storage unit that clears the monitoring flag and stores the version number included in the section and the previous version number indicating the version of the section included in the previously received data Determining whether or not the version number matches, discarding the section if determined to match, and transferring the section to the memory if determined not to match; and
When the control unit enabled to acquire the section from the memory monitors the monitoring flag every predetermined time, and determines that the monitoring flag is cleared in the monitoring result, the monitoring flag is set. Resetting and determining that the section has disappeared if it is determined that the monitoring flag is set;
Including a receiving method.

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