JP2005328334A - Transmission system and method, transmission device and method, and receiving apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate a position of a TS packet in a section, and to prevent the deterioration of the transmission efficiency of data to a current system. <P>SOLUTION: A packet-address information is stored in an adaptation region for the TS packet by using 3 bytes. The region of 3 bytes is prepared for a module number in a data component, the region of 6 bytes for a block number in a module, and the region of 5 bytes for an address of the TS packet in the section. When the module and section numbers in the data component are equal to fixed numbers or less respectively, the position of the TS packet in the data component can be specified easily. The adaptation region is not prepared to the TS packet at the head of the section. The TS packet at the head of the section has 184 bytes, other TS packets has 178 bytes, one section can be transmitted by 23 packets, and there is no difference with the current system at the point of the transmission efficiency of the section. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission system and method, a transmitting apparatus and method, and a receiving apparatus and method that enable efficient collection of modules in a digital broadcast data broadcasting service.

  In digital broadcasting, MPEG2 Systems (Moving Pictures Experts Group 2 Systems: ISO / IEC 13818-1) is employed as a method of synchronizing and multiplexing video, audio, and data. In digital broadcasting, data is transmitted by a transport stream (TS). In the TS, data is time-division multiplexed in transmission units called TS packets and transmitted.

  There is a data broadcasting service as one of digital broadcasting services. In data broadcasting services, data content is transmitted in units called sections. Data components constituting the data content are divided into modules of an arbitrary size, and a module ID is assigned to each module as an identifier. The module is further divided into fixed-length blocks, and position information in the module is added to the blocks to form sections. In broadcasting, a section is further divided and stored in a plurality of continuous TS packets for transmission.

In data broadcasting services, a data carousel transmission method is used in which data content is repeatedly transmitted at regular intervals. In the data carousel transmission method, data contents are cyclically transmitted in units of blocks (sections). Non-Patent Document 1 describes such a transmission system in digital broadcasting.
Yutaka Takada and Satoshi Asami, “Introduction to Digital TV Technology”, first edition, Yoneda Publishing, December 14, 2001, p. 145-p. 163

  On the receiver side that receives the data transmitted by such a transmission method, the section is restored using the received TS packet, and the original module is restored using the restored section. Then, the data content is restored based on the module ID.

  According to the prior art, a TS packet does not have the position information of the TS packet in a section. Therefore, in order to receive one section correctly, all the packets constituting the section are received continuously without error. There is a need to. For example, when a packet constituting a section is transmitted as shown in FIG. 18, if section 1 is to be received, it is necessary to sequentially receive packets 1 to 3 constituting section 1 without error.

  At this time, for example, if the packet 2 of the section 1 cannot be received due to a packet error, the position of the received packet in the section is not known even if the packet is received without error after the next packet 3. Therefore, the packet cannot be collected until the head of the next section is found.

  For example, when the last packet of the section cannot be received due to an error or the like, the receiver cannot determine whether the packet that could not be received is the last packet of the section. Therefore, the receiver has to re-receive the packets of the section in order from the beginning. This means that a packet that has been correctly received and is halfway through the section is invalidated.

  On the other hand, a TS packet is provided with a 4-bit area called a continuity index that is incremented by 1 bit for each TS packet. In other words, if TS packets are continuously acquired without error, a sequence in which the value of the continuity index increases from 0 to 1 for each TS packet to 15 repeatedly appears. In other words, the continuity index returns to 0 after the packet number is 15. Therefore, the receiver determines the continuity of TS packets based on this continuity index in an environment where, for example, the antenna is fixed and the packet error is small and stable reception is possible, and the packet is not captured in the section. it can.

  By the way, in recent years, a technology has been developed that enables digital broadcasting to be received by a portable communication terminal device (hereinafter referred to as a portable communication terminal) such as a mobile phone terminal or a PDA (Personal Digital Assistant). It is considered that portable communication terminals are often used while moving, for example, while walking or on a train. During movement, the state of radio waves is likely to change, and the reception state becomes unstable. When a TS packet is received in this state and an attempt is made to restore a section, there is a high possibility that an error will occur in units of TS packets. In such a reception environment, there are cases where TS packets can be received continuously without error, and suddenly, most of the received TS packets can easily become error packets.

  In such a reception environment, there is a possibility that TS packets of different sections are erroneously captured by the method of identifying the continuity of TS packets using only the continuity index. In this case, of course, since the section cannot be correctly restored, the reception of the TS packet is continued until the TS packet is correctly received and the section is restored. In actual display, the display waits for a while from when the reception of the broadcast by the data broadcasting service is started until the section is correctly restored.

  In order to avoid this, a method has been proposed in which absolute position information indicating the absolute position in the data component of the TS packet is added to each TS packet. According to this proposal, an area called an adaptation field defined in the TS packet is 11 bytes, and 8 bytes are used as an area for storing packet address information. Then, 29 bits in the area are used to express the address space of the data component in units of TS packets. The adaptation field is optional and can store information defined by the user. The presence / absence of the adaptation field is indicated by a 2-bit flag called adaptation field control included in the header of the TS packet.

  As described above, in the data broadcasting service, sections are transmitted cyclically by the carousel transmission method. Therefore, according to this method in which each transmitted TS packet has position information about itself, a section to be transmitted cyclically is repeatedly received several times even in a reception environment in which many packet errors occur. By doing so, the section can be restored. In this method, display waiting is eliminated at a speed several times faster than when sections are restored using only the continuity index.

  However, this method has a problem in that it is necessary to secure an area of 11 bytes for the TS packet for the absolute position information of the TS packet, resulting in poor data transmission efficiency.

  The TS packet has a fixed size of 188 bytes, of which 4 bytes are used for the header. In the case of the current method that does not use the adaptation field, the size of the payload is 184 bytes obtained by subtracting 4 bytes for the header from 188 bytes. Since the maximum size of a section is determined to be 4096 bytes, a maximum of 23 packets (4096/184 = 22 remainder 48) are required to transmit one section of data.

  On the other hand, when the absolute position information of the TS packet is transmitted using 11 bytes of the adaptation field, 173 is obtained by subtracting 11 bytes used as the adaptation field from the remaining 184 bytes obtained by subtracting 4 bytes for the header from 188 bytes. A byte is an area (payload) in which data of a section can be stored. Therefore, when this method is used, a maximum of 24 packets (4096/173 = 23 remainder 117) are required to transmit one section of data, and the transmission efficiency is deteriorated as compared with the current method.

  In addition, according to the proposed method, only 29 bits are used for expressing the address space in the 8-byte area for storing the packet address information, and the number of modules that can actually be operated for each broadcasting system is used. The number of sections is limited, and all 29 bits are not used.

  Therefore, an object of the present invention is to provide a transmission system and method, a transmitting apparatus and method, which can determine the position of a TS packet in a section and does not deteriorate the data transmission efficiency with respect to the current system, and It is to provide a receiving apparatus and method.

  In order to solve the above-described problem, the invention according to claim 1 is a transmission system for cyclically transmitting a plurality of packets in which data is divided and stored, and divided data obtained by dividing data into packets. A packetizing means for storing packet address information indicating an address on the data of the divided data and information indicating a type of the packet address information in a predetermined area of the packet and outputting the packet data from the packetizing means. A transmission device comprising a transmission means for transmitting the received packet, a reception means for receiving a packet transmitted from the transmission means, information indicating the type of packet address information from a predetermined area of the packet received by the reception means, and a packet Based on the information indicating the type of the extracted packet address information. With less information, a transmission system and having a data arrangement means for arranging the address indicated divided data into packet address information and receiving apparatus having a.

  According to a seventeenth aspect of the present invention, in the transmission method for cyclically transmitting a plurality of packets in which data is divided and stored, the divided data in which the data is divided in units of packets is stored in the packet, and A packetizing step for storing packet address information indicating an address on data of data and information indicating a type of the packet address information in a predetermined area of the packet, and transmitting a packet output by the packetizing step Extracting and extracting the packet address information and the packet address information type from the transmission step, the reception step for receiving the packet transmitted from the transmission step, and the predetermined area of the packet received by the reception step Packet address based on the information indicating the type of the received packet address information. Using the information, a transmission method characterized by a step of data arrangement of placing the address indicated divided data into packet address information.

  According to an eighteenth aspect of the present invention, in a transmission device that cyclically transmits a plurality of packets in which data is divided and stored, the divided data in which the data is divided in units of packets is stored in the packet, and the division is also performed. Packetizing means for storing packet address information indicating an address on the data and information indicating the type of the packet address information in a predetermined area of the packet, and transmitting means for transmitting the packet output from the packetizing means A transmission device characterized by comprising:

  According to a thirty-fourth aspect of the present invention, in the transmission method for cyclically transmitting a plurality of packets in which data is divided and stored, the divided data in which the data is divided in units of packets is stored in the packet, and the division is performed. A packetizing step for storing packet address information indicating an address on data of data and information indicating a type of the packet address information in a predetermined area of the packet, and transmitting a packet output by the packetizing step And a transmission step.

  According to a thirty-fifth aspect of the present invention, in a receiving apparatus for receiving a plurality of packets in which data is divided and stored, which is transmitted cyclically, the divided data obtained by dividing the data into packets is stored in the packet. Receiving means for receiving the packet address information indicating the address on the data of the divided data and information indicating the type of the packet address information stored in a predetermined area of the packet; and receiving means The packet address information type and the packet address information type information are extracted from the predetermined area of the packet received in step, and the packet address information is used based on the extracted packet address information type information to packet the divided data. And data arrangement means for arranging at an address indicated by the address information. A receiving device.

  The invention according to claim 51 is a receiving method for receiving a plurality of packets in which data is divided and stored in a cyclic manner, and the divided data obtained by dividing the data into packets is stored in the packet. A reception step of receiving the packet address information indicating the address on the data of the divided data and the information indicating the type of the packet address information stored in a predetermined area of the packet; Information indicating the type of packet address information and packet address information are extracted from a predetermined area of the packet received by the step, and the divided data is obtained using the packet address information based on the extracted information indicating the type of packet address information. Data placement step for placing the data at the address indicated in the packet address information; A receiving method characterized by comprising.

  As described above, the inventions according to claims 1 and 17 store, in a packet, divided data obtained by dividing data into packets, packet address information indicating an address on the data of the divided data, and a packet address Information indicating the type of information is stored and transmitted in a predetermined area of the packet, and the transmitted packet is received and information indicating the type of packet address information and packet address information are extracted from the predetermined area of the packet; Based on the information indicating the type of the extracted packet address information, using the packet address information, the divided data is arranged at the address indicated by the packet address information, so the reception state is poor and some packets are received. Even if it is not possible, when a packet sent cyclically can be received correctly later, Packets can be placed in the appropriate address on the data based to the packet address information, can recover the original data. Also, information indicating the type of the packet address information is transmitted together with the packet address information, and the receiving side uses the packet address information based on the information indicating the type of the packet address information. Even when mixed transmission is performed, packets can be appropriately arranged on the receiving side.

  The inventions according to claims 18 and 34 store the divided data obtained by dividing the data into packets and store the packet address information indicating the address of the divided data and the type of the packet address information. Is stored in a predetermined area of the packet and transmitted, so even if the reception side is bad and some packets cannot be received, the packet is sent cyclically Can be correctly received later, the packet can be placed at an appropriate address on the data based on the packet address information, and the original data can be restored. In addition, since the information indicating the type of the packet address information is transmitted together with the packet address information, by using the packet address information based on the information indicating the type of the packet address information on the receiving side, a plurality of types of packet addresses can be used. Even when information is mixedly transmitted, the receiving side can appropriately arrange packets.

  In the inventions according to claims 35 and 51, the divided data obtained by dividing the data into packets is stored in the packet, and the packet address information indicating the address of the divided data and the packet address information The information indicating the type is stored in the predetermined area of the packet, the transmitted packet is received, the information indicating the type of the packet address information and the packet address information are extracted from the predetermined area of the received packet, and extracted. Based on the information indicating the type of the packet address information, the packet address information is used to arrange the divided data at the address indicated by the packet address information, so that the reception state is poor and some packets cannot be received. Even when a packet sent cyclically is received correctly later, Based the packet to the packet address information can be placed in the appropriate address on the data, you can recover the original data. Further, since the packet address information is used based on the information indicating the type of the packet address information, even when a plurality of types of packet address information are mixed and transmitted, the packet can be appropriately arranged.

  According to the present invention, by adding packet address information to the adaptation field of a TS packet, it is possible to efficiently construct a section based on a TS packet broadcast by a data broadcasting service in a reception environment where errors frequently occur. effective.

  Also, since packet address information is transmitted using the adaptation field, compatibility with the conventional transmission method can be maintained, and TS packet address information can be transmitted without affecting the receiving device according to the conventional standard. There is an effect that can.

  Furthermore, since the configuration of the packet address information is devised so as to save the size of the adaptation field, there is an effect that the section transmission efficiency is not lowered as compared with the current method.

  Therefore, there is an effect that the broadcaster can implement the data broadcast service while maintaining compatibility with the conventional transmission method without changing the transmission efficiency of the section.

  Furthermore, on the receiving device side, by supporting the transmission method according to the present invention, sections can be efficiently handled even in a reception environment where the reception state changes every moment, such as reception while moving using a portable terminal. The program can be collected and the program by the data broadcasting service can be presented in a shorter time from the start of reception.

  The present invention will be described below. First, in order to facilitate understanding, a transmission format of a data broadcasting service in digital broadcasting will be schematically described. For example, a data component which is data constituting one program broadcast by a data broadcasting service is divided into a plurality of modules as shown in FIG. The module has a variable length and is composed of data of an arbitrary size.

  The module is divided into fixed-length blocks having a size of 4066 bytes as shown in FIG. The last block of the module will be 4066 bytes or less in size. A block is formed by adding a header (section header) and a CRC (cyclic redundancy check) code for error correction to the block into which the module is divided. The position information in the module of the section is stored in the section header.

  As conceptually shown in FIG. 3, the sections are cyclically transmitted by a data carousel transmission scheme. The data carousel transmission system is a transmission system that repeatedly transmits data at regular intervals, and is suitable for transmission that does not require streaming. In the data carousel transmission system, two types of messages are mainly used: DDB (Download Data Block) containing actual content data and DII (Download Info Indicateion) describing DDB directory information.

  The DDB corresponds to the block into which the module is divided as described above, and is assigned a block number. The receiver reconstructs the module by rearranging the acquired data blocks in the order of the block numbers. DII is a list of module information in the data carousel. The DII describes information such as directory information, module size, total number of modules, module number, module version, and module type of the modules constituting the content. A plurality of module information can be described in one DII. The receiver can know the module configuration by receiving this DII.

As an example, when transmitting a module 1 having a size of 2 k (kilobytes) and a module 2 having a size of 6 kbytes, one DII message, one DDB (1) for module 1 and module 2 Two DDBs (2-1) and (2-2) are prepared. As described above, the module is divided into fixed-length blocks having a size of 4066 bytes (≈4 kbytes), so that the two DDBs for module 2 have a size of 4 kbytes and 2 kbytes, respectively. The The sending order of DII and DDB is arbitrary. Since the data corresponding to the table of contents is stored, the DII is transmitted at a relatively high frequency. For example,
DII, DDB (1), DDB (2-1), DII, DDB (1), DDB (2-2)
Can be sent out in the following order. In this example, the module 2 transmits at a cycle twice that of the module 1.

  FIG. 4 shows an exemplary configuration of a section. The section includes a section header, a payload, and a CRC part, and has a maximum size of 4096 bytes including the section header and CRC. The block into which the module is divided is stored in the payload portion. The section header has a size of 8 bytes, and stores table identification (table ID), section length, table identification extension, version information, and section information. The table identification has a size of 1 byte, for example, indicating whether this section is a DDB message or a DII message described above, for example, indicating that the section is a DII message with a value of “0x3B”, The value is “0x3C”, indicating that the section is a DDB message.

  In the value description, “x” indicates that the notation is hexadecimal notation. This also applies to the following similar notation.

  The section length has a size of 2 bytes and indicates the size of the section excluding the field of table identification and the section length itself. In the example of FIG. 4, since the size of the entire section is 4096, the section length is described as 4093 bytes. The table identification extension, version number, and the like have different meanings depending on the table identification value. That is, for example, the table identification extension is used as the lower 2 bytes of the transaction identification if the value of the table identification is “0x3B” and this section indicates that it is a DII message. If the value of the table identification is “0x3C” and this section indicates a DDB message, it is used as a module identification.

  The section information stores a section number and a final section number each having a size of 1 byte. For example, if the module M is 10 kbytes in size and consists of three sections, (section number / final section number) is (0/2), (1/2) and Assigned (2/2). The CRC is a check code for verifying whether TS packets constituting the section are correctly collected in order.

  The section is further divided into TS packets (see FIG. 2). That is, the section is divided into the size of the payload of the TS packet, a header is added to the TS packet, and a TS packet is formed. FIG. 5 shows an exemplary configuration of a TS packet. A TS packet includes a header and a payload, and an adaptation field can be added as an option. The header includes a synchronization byte, various indicators, a PID (Packet ID), a control bit, and a continuity index.

  The synchronization byte is a synchronization signal having a length of 8 bits. Each indicator consists of a transport error indicator, a payload unit start indicator, and a transport priority, each 1 bit in length. The PID is a 13-bit long field for identifying a TS packet, and differs depending on the type of data stored in the payload. At the receiver, the PID is used to filter received TS packets. The control bits include 2-bit scramble control indicating the presence and type of scramble, and 2-bit adaptation field control indicating the presence of an adaptation field and payload. The continuity index is a 4-bit field that is incremented by 1 for each TS packet of the same PID. That is, the continuity index takes a value of 0 to 15 cyclically.

  Next, a first embodiment of the present invention will be described. In the first embodiment of the present invention, 6 bytes are defined as an adaptation field for a TS packet in order to represent position information within a section of the TS packet. As an example is shown in FIG. 5, the data defined in advance by the standard is stored in the first three bytes of the 6-byte adaptation field, and the position in the section of the TS packet is stored in the latter three bytes. The packet address information shown is stored. In the breakdown of the first three bytes, the first 8 bits are the field length of the adaptation field itself, and the next 16-bit field is various flags.

  FIG. 6 shows an example of the structure of packet address information in the adaptation field according to the first embodiment of the present invention. In FIG. 6, the structure of the packet arrangement information is shown based on a C language description method used as a program description language such as a computer device. This is the same in the diagrams representing other data structures.

  In the packet address information, the field Private_data_type having an initial data length of 8 bits has a value of “0x81” and indicates that the packet address information is TS packet address information according to the first embodiment. Next, a field Reserved of 2 bits is reserved as a reserved area. After that, a field Block_Index (block number) with a data length of 6 bits, a field Module_Index (module identification number) with a data length of 3 bits, and a field with a data length of 5 bits TS_packet_number (TS packet number) is allocated.

  A field Block_Index stores a value indicating a position in a module of a block, that is, a section to which the TS packet belongs. The value stored in the field Block_Index ranges from 0 to 63. The field Module_Index stores the identification number in the data component of the module to which the TS packet belongs. The value stored in the field Module_Index ranges from 0 to 7. A field TS_packet_number stores a value indicating the position of the TS packet in the section. The value stored in the field TS_packet_number ranges from 0 to 31.

  According to this method, there are 64 sections to which the TS packet belongs, and there are 8 positions in the data component of the module to which the TS packet belongs, and each TS packet can be identified. Furthermore, the position of the TS packet in the section can be identified in 32 ways. That is, in the data component, when the number of modules is 8 or less, the number of sections included in the module is 64 or less, and the number of TS packets into which the section is divided is 32 or less, the data component of the TS packet The position at can be uniquely indicated.

  A section transmission method according to the first embodiment of the present invention will be described with reference to FIG. As already described, the section is divided into TS packets and transmitted. In the first embodiment of the present invention, the packet address information is added to all remaining TS packets except the first TS packet of the section. The adaptation field of the TS packet storing the head data of the section is emptied. That is, no adaptation field is defined in the TS packet.

Now, consider the packet transmission efficiency according to the first embodiment of the present invention. The number of TS packets necessary to transmit a total of 4097 bytes including 1 byte of the pointer field and 4096 bytes of the section is calculated in the following three cases.
(1) When the adaptation field is not used in all TS packets of the section (2) When the adaptation field of 6 bytes is used in all TS packets of the section (3) The adaptation field is not used in the first TS packet of the section When a 6-byte adaptation field is used for all remaining TS packets

When the adaptation field is not used in all TS packets in the section (1) (that is, in the current method), the payload size is set to 184 bytes in all TS packets in the section. Therefore,
4097 (bytes) / 184 (bytes) = 22 remainder 49 (bytes)
It becomes. Since one TS packet is required to store the remaining 49 bytes, 22 + 1 = 23 TS packets are required to transmit one section.

When the 6-byte adaptation field is used in all the TS packets in the section (2), the payload size is set to 178 bytes in all the TS packets in the section. Therefore,
4097/178 = 23 remainder 3 (bytes)
It becomes. Since one TS packet is required to store the remaining 3 bytes, 23 + 1 = 24 TS packets are required to transmit one section.

When the adaptation field is not used for the first TS packet of the section (3) and the 6-byte adaptation field is used for all the remaining TS packets, the payload size in the first TS packet of the section is 184 bytes. The payload size is set to 178 bytes in all the remaining TS packets of the session. Therefore,
1 + ((4097-184) / 178) = 22 remainder 175 (bytes)
It becomes. Since one TS packet is required to store the remaining 175 bytes, 22 + 1 = 23 TS packets are required to transmit one section.

As described above, when the 6-byte adaptation field is used in all TS packets of the section in (2) and in the case of (3), no adaptation field is used in the first TS packet of the section, and all the remaining TSs are used. When packet transmission efficiency is compared with the case where a 6-byte adaptation field is used for the packet,
24/23 = 1.043
Thus, there is a difference of about 4% in section transmission efficiency, and it can be seen that the method in which no adaptation field is provided in the TS packet at the head of the section is more advantageous in terms of transmission efficiency.

  Note that the TS packet at the beginning of the section does not have an adaptation field, so that it can be identified that it is the TS packet at the beginning of the section. As described with reference to FIG. 4, the section header has a data length of 8 bytes. On the other hand, the payload of the TS packet storing the head data of the section is 184 bytes in size. Therefore, all section header data is stored in the payload of the TS packet. Therefore, section information can be obtained based on the payload data of the TS packet.

  Furthermore, as described above, in the method according to the first embodiment, when the number of TS packets into which a section is divided is 32 or less, it is possible to identify each TS packet corresponding to the section. As described above, since 23 packets are sufficient to transmit one section, TS packets can always be identified within a section.

  Thus, according to the first embodiment of the present invention, when the number of modules constituting the data component and the number of sections included in the module are each equal to or less than a predetermined number, the position of the TS packet in the data component is determined. Transmission efficiency that can be obtained and is not different from the current system can be realized.

  Next, a second embodiment of the present invention will be described. FIG. 8 shows an example of the structure of packet address information in the adaptation field according to the second embodiment of the present invention. Also in the second embodiment, an adaptation field having a data length of 6 bytes is defined for a TS packet, and 3 bytes are used as packet address information, as in the first embodiment.

  In the packet address information, the field Private_data_type having an initial data length of 8 bits has a value of “0x82” and indicates that the packet address information is TS packet address information according to the second embodiment. Next, a field Section_Index (section identification number) having a data length of 11 bits is arranged, and then a field TS_packet_number (TS packet number) having a data length of 5 bits is arranged.

  The field Section_Index stores an identification number in the data component of a block, that is, a section to which the TS packet belongs. The value stored in the field Section_Index ranges from 0 to 2047. The value of the field Section_Index is uniquely assigned to each section in the data component without duplication of values. A field TS_packet_number stores a value indicating the position of the TS packet in the section. The value stored in the field TS_packet_number ranges from 0 to 31.

  That is, in the second embodiment, if the number of sections included in the data component is 2048 or less, the value stored in the field Section_Index and the value stored in the field TS_packet_number The absolute position at can be obtained.

  In the second embodiment as well, the transmission of the section is the same as in the first embodiment described above, the adaptation field is not defined in the first TS packet of the section, and the remaining TS packets of the section A 6-byte adaptation field is defined for packet address information.

  In the second embodiment, there is no block number information as packet address information. However, since the value stored in the field Section_Index can range from “0” to “2047”, a unique number can be assigned to each TS packet for more sections.

  FIG. 9 schematically shows a configuration of an example of the transmission apparatus 1 that can be commonly applied to the first and second embodiments of the present invention. A module is input to the module input unit 10. The input module is supplied to the section divider 11. The module is divided into a predetermined size by the section dividing unit 11, and a header and CRC are added to form a section. This section is a DDB message in which the module body is stored. The DDB is supplied to the TS packet dividing unit 14.

  On the other hand, the list information creation unit 12 creates a list of module information in the data carousel based on the modules input to the module input unit 10. The created list information is supplied to the section dividing unit 13 to form a section. This section is a DII message storing DDB list information that is cyclically transmitted in the data carousel. The DII is supplied to the TS packet dividing unit 14.

  The TS packet dividing unit 14 divides the supplied DDB and DII into the size of the payload of the TS packet. At this time, data of 184 bytes is cut from the head of the section. The rest of the section is split every 178 bytes. Data divided into the size of the payload of the TS packet is supplied to the TS packetization unit 16.

  The adaptation information creation unit 15 creates packet address information according to section division processing in the TS packet division unit 14, for example, and creates adaptation field data. The data of the created adaptation field is supplied to the TS packetizing unit 16.

  For example, in the first embodiment, the module number of the module input to the module input unit 10, the section number of the section supplied to the TS packet dividing unit 14, and the section is divided by the TS packet dividing unit 14. Packet address information is created based on the TS packet number corresponding to the payload in which the stored data is stored. In the second embodiment, packet address information is created using only the section number and TS packet number. When the packet address information is created, the DII supplied from the section dividing unit 13 can be used.

  The TS packetizing unit 16 creates a TS packet by using the data divided into the size of the payload of the TS packet by the TS packet dividing unit 14 and the data of the adaptation field created by the adaptation information creating unit. A TS packet is created by adding only the header of the TS packet to the payload storing the data at the head of the section. A TS packet header and an adaptation field are added to the payload in which the remaining data other than the head portion of the section is stored, thereby creating a TS packet. The created TS packet is output as transmission data 17.

  The transmission data 17 is broadcast by a transmission facility (not shown). At this time, the transmission data 17 is transmitted cyclically, for example, in units of modules. Within the section, TS packets (transmission data 17) are continuously transmitted.

  Note that the transmitting apparatus 1 can also transmit a TS packet having packet address information and a TS packet not having this information mixedly. In this case, on the receiving device side, which will be described later, for TS packets having packet address information, data is arranged with reference to the packet address information. On the other hand, for TS packets that do not have packet address information, data is arranged using a continuity index, and sections are collected.

  For example, a TS packet including a section head portion is acquired using a continuity index because it does not have packet address information. From this TS packet, section information such as a module number, a section number, and a version number stored in the section header can be obtained. These information and the packet address information in the adaptation field in the second TS packet that follows. Correspondence can be obtained.

  FIG. 10 shows an example of the configuration of the receiving device 2 for receiving the transmission data 17 thus broadcast and reconstructing the original module. FIG. 11 is a flowchart illustrating an example of processing for performing module reconstruction in the reception device 2. A radio wave of digital broadcasting is received by a receiving unit (not shown) (step S10), subjected to predetermined demodulation processing and the like, and a digital signal is obtained. This digital signal is input to the section construction unit 21 as a reception input signal 20. The section construction unit 21 detects the synchronization signal of the TS packet from the received input signal 20, and extracts the TS packet based on the detection result (step S11).

  The section construction unit 21 further extracts 2 bits of adaptation field control from the extracted control bits of the header of the TS packet, and checks whether or not there is an adaptation field (step S12). If the adaptation field control indicates that there is no adaptation field, it is determined that the TS packet is a TS packet in which data at the head of the section is stored, and the process proceeds to step S13. As described above, since the section header information is stored in the payload of the TS packet in which the head data of the section is stored, in step S13, the section corresponding to the TS packet is obtained based on the section header information. It is done. If a section is obtained, the process proceeds to step S16.

  On the other hand, if the adaptation field control indicates that there is an adaptation field in step S12, the adaptation field is extracted from the TS packet in step S14. Then, based on the packet address information in the adaptation field, a corresponding section of the TS packet is obtained. In the first embodiment, it is further possible to obtain the position in the data component of the section corresponding to the TS packet. In the next step S15, the position of the data stored in the payload of the TS packet in the section is obtained based on the packet address information.

  For example, in the example of the first embodiment, for the TS packet, by using the values of the field Module_Index and the field Block_Index of the packet address information, the number of modules and the number of sections in the module are each equal to or less than a predetermined number. , The corresponding section and module of the TS packet can be determined. Further, by using the value of the field TS_packet_number, the position of the TS packet in the section can be obtained.

  For example, in the example of the second embodiment, when the number of sections in the data component is equal to or less than a predetermined number for the TS packet, the value of the field Section_Index of the packet address information is used, so that the section in the data component The position in the section of the TS packet can be obtained by using the value of the field TS_packet_number.

  Whether the TS packet is according to the first embodiment or the second embodiment can be determined from the value of the field Private_data_type in the packet address information.

  If the position in the section of the TS packet is obtained in step S15, the process proceeds to step S16. In step S16, a section is constructed using the data stored in the payload of the TS packet. For example, the section construction unit 21 extracts data from the payload for the TS packet determined to have no adaptation field in step S12, and arranges the extracted data at the head of the section obtained in step S13. On the other hand, for the TS packet determined to have an adaptation field in step S12, the data extracted from the payload is arranged at the position determined in step S15 in the section determined in step S13. For example, data is arranged at a predetermined position by writing the data at a predetermined address in the memory.

  Since the position is acquired for each TS packet, the TS packet can be arranged at a predetermined position without referring to the preceding and succeeding TS packets. Therefore, even if a reception environment is bad and a large number of TS packets are not correctly received due to frequent errors, TS packets can be placed at a fixed position with high probability.

  In step S17, it is determined whether or not all the section data has been prepared. As described above, in the first and second embodiments, 23 TS packets are required to transmit one section. As an example, in step S17, it is determined whether or not 23 TS packets of the section are received for a section. If the number is not enough, it is determined that all data of the section is not complete. It is possible to know which TS packet is insufficient by examining the position information in the section of the TS packet corresponding to the section received so far. If it is determined that all the TS packets in the section are not complete, the process returns to step S10, and the process is repeated until all the TS packets in the section are complete.

  On the other hand, if it is determined in step S17 that all of the section data is available, the process proceeds to step S18. In step S18, for example, a CRC is calculated using the section data, and the calculation result is compared with the CRC value added to the section at the time of transmission to verify whether the section data is correct. For example, a CRC error occurs when an error exists in the TS packet itself or when a TS packet of a different section is erroneously taken. If it is determined that the data in the section is not correct, the data in the section is discarded and the process returns to step S10. The process is repeated until all the data of the section is obtained.

  If it is determined in step S18 that the data in the section is correct, the data in the section is supplied to the message dividing unit 22. Based on the information in the section header, the message division unit 22 determines whether the section is a DII message or a DDB message, and sorts the sections (step S19). Among the sorted sections, DII is supplied to the module confirmation unit 23, and DDB is supplied to the module construction unit 24.

  The module construction unit 24 constructs a module based on the supplied DDB (step S20). The module is constructed with reference to the module number and the section number stored in the section header of each section, for example. Further, the module confirmation unit 23 confirms the collection status of data (TS packets) used for the module constructed by the module construction unit 24 based on the supplied DII (step S21). In the module confirmation unit 23, it is confirmed whether or not all sections used for the module are prepared (step S22). If it is confirmed that all of them are prepared, the completed module is output as the module output 25. If all the sections are not complete, the process returns to step S10, and the process is repeated until all the sections used for the module are complete.

  In the above description, it has been described that one section or one module is processed in series, but this is not limited to this example. For example, a plurality of sections and modules can be processed in parallel. Even in this case, the processing for individual sections and modules is serial. That is, even if TS packets of different sections or modules are intermittently received, the position of the TS packet in the data component can be acquired based on the packet address information in the adaptation field.

  Next explained is the third embodiment of the invention. FIG. 12 shows an example of the structure of packet address information in the adaptation field according to the third embodiment of the present invention. In the third embodiment, 2 bytes are used as the packet address information, and the address information in the module of the TS packet is given as a relative address.

  In the packet address information, the field Private_data_type having an initial data length of 8 bits has a value of “0x83” and indicates that the packet address information is TS packet address information according to the third embodiment. Next, a field TSP_Count (TS packet count) having a data length of 8 bits is arranged. Thus, in the third embodiment of the present invention, 2 bytes are allocated to the packet address information, and the size of the adaptation field is 5 bytes.

  A field TSP_Count is a value incremented by 1 for each TS packet, and stores a value obtained by counting TS packets with a period of 255. There is no specification of the initial value. The value stored in the field TSP_Count ranges from 0 to 254. Hereinafter, a value stored in the field TSP_Count is referred to as a TSP count value, and a period of the TSP count value is referred to as a TSP count period.

  By setting the TSP count period to 255, which is smaller by 1 than the maximum value 256 for an 8-bit field, the position of the 255 × 16 = 4080 TS packet is combined with the continuity index of the TS packet header. It can be specified relatively. If the TSP count cycle is 256, it becomes an integral multiple of 16 which is the cycle of the continuity index, and the range in which the relative position of the TS packet can be determined is approximately 1/16 compared to the case where the cycle is 255. .

That is, when the third period is created by combining the first and second periods having different periods, the third period is the least common multiple of the first period and the second period. For 16 (= 2 ⁴ ), which is the period of the continuity index, and 256 (= 2 ⁸ ), which is the maximum value that can be represented by 8 bits, the greatest common divisor is 16, which is equal to the continuity index itself, These least common multiples are 256. Therefore, the period obtained by combining these two periods is 256.

  On the other hand, in 255 (= 3 × 5 × 17) and 16, since there is no common divisor other than 1, the least common multiple is 255 × 16 = 4080, and the cycle obtained by combining these two cycles is 4080. Become. This is the maximum period obtained using a continuity index expressed in 4 bits and an 8-bit field.

  The TSP count cycle is not limited to 255. That is, if the greatest common divisor between the period of the field TSP_Count and the period of the continuity index is not the mutual period itself, the period of the continuity index or the TSP is obtained as a period combining the TSP count period and the period of the continuity index. A longer period can be obtained than the longer period of the count periods. For example, if the period of the continuity index is 16 and the TSP count period is 3, the combined period is 48.

  As another example, an example in which the period of the continuity index is 16 and the TSP count period is 7 will be described more specifically with reference to FIG. In this case, when the continuity index and the TSP count value are combined, a period of 16 × 7 = 112 is obtained. That is, as an example is shown in FIG. 13, the continuity index repeats a change of 0 to 15 for each TS packet, whereas the TSP count value repeats a change of 0 to 6 for each TS packet. In the combination of the continuity index value and the TSP count value, the same combination does not appear until the continuity index period reaches the seventh lap, and the same combination appears again from the eighth week of the continuity index. Therefore, for example, by using these in combination, such as (continuity index value, TSP count value), a period longer than both the period of the continuity index and the TSP count period can be obtained.

  A method for obtaining the relative position of the TS packet by combining the TSP count value and the continuity index will be described. In the method of collecting TS packets using only the continuity index and constructing the section, the period of the continuity index is as short as 16, so in an environment where there are many packet errors such as reception while moving using a mobile terminal. There is a possibility of collecting packets by mistake. When the section size is 4096 bytes, as described above, 23 TS packets are required to transmit the section. Therefore, if packet errors occur continuously for 16 packets or more, the position in the section of the TS packet received thereafter is not known. For example, the sixth packet from the beginning of the section and the 22nd packet have the same continuity index.

  According to the third embodiment, by using the TSP count value stored in the adaptation field, the position in the section of the TS packet that can be received without error even if there are 16 or more consecutive packet errors. Can be obtained. As an example, it is assumed that among the 23 TS packets of the 4096-byte section, the first TS packet of the section and the 22nd packet have been correctly received.

  As an example is shown in FIG. 14, the continuity index value and the TSP count value are both 0 in the first TS packet. The 22nd TS packet has a continuity index of 5. On the other hand, the continuity index is also 5 for the sixth TS packet. Therefore, if only the continuity index is used, it cannot be determined whether the received TS packet is the sixth TS packet from the head or the 22nd TS packet.

  Here, the expected value of the TSP count value of the TS packet correctly received can be calculated from the continuity index of the reference TS packet and the TSP count value. When the reference TS packet is the first TS packet received correctly, the expected value of the TSP count value corresponding to the continuity index of 5 is 5 or 21. If the TSP count value of the correctly received TS packet matches the expected value, the TS packet is being collected as a TS packet identified by the TSP count value that matches the expected value and the continuity index of the TS packet. Can be used as part of a section.

  A method for calculating the position of the TS packet using the TSP count value and the continuity index will be described more specifically. In the following equation, MOD is an integer remainder calculation, and DIV is a division quotient. Also, let the value of the continuity index in the TS packet header be x (0 ≦ x ≦ 15) and the TSP count value in the adaptation field be q (0 ≦ q ≦ 254). S is a TSP count cycle and takes a fixed value of 255.

First, it is determined whether or not the continuity index x is larger than the value q of the target TS packet. If the continuity index x is equal or smaller, the value x is subtracted from the value q to obtain the value r. If it is larger, the TSP count cycle S is added to the value q, and the value x is subtracted therefrom to obtain the value r. That is, the value r is obtained by the following procedure.
r = q
if (r <x) then r = r + S
r = r−x

Using the value r thus obtained, the following equation (1) is calculated to obtain the value p.
p = (MOD (r, 16) × 16 + DIV (r, 16)) × 16 + x (1)
Thus, the value p is a value obtained from the continuity index and the TSP count value, and takes a value from “0” to “4079”. If the value p is calculated using this equation (1) for each TS packet that has been correctly received, the positional relationship between the TS packets can be known from the difference in the value p. That is, the value p is a value that gives the relative position of the TS packet.

  For example, as shown in FIG. 15, in a certain section, the first and second TS packets can be received correctly, followed by an error packet, and then the Nth TS packet and the (N + 1) th TS packet. Consider the case where the message was received correctly. The value p of the reference TS packet (for example, the first TS packet) is obtained using Expression (1). Similarly, for the Nth and (N + 1) th TS packets, the value p is obtained by Expression (1). Based on the difference between these values p, it is possible to know how many packets are away from the reference TS packet by the Nth and (N + 1) th TS packets.

  Further, since the TSP count value can take a value from 0 to 4079, the corresponding section of the TS packet and the position of the TS packet within the section can be easily acquired in a wide range.

In the third embodiment, an adaptation field of 5 bytes is used for all TS packets in the section. Therefore, the payload size is set to 179 bytes in all TS packets of the section. Therefore,
4097/179 = 22 remainder 159 (bytes)
It becomes. Since one TS packet is required to store the remaining 159 bytes, 22 + 1 = 23 TS packets are required to transmit one section. Therefore, the section transmission efficiency is the same as that in the first and second embodiments described above.

  FIG. 16 schematically shows a configuration of an example of a transmission apparatus 1 ′ applicable to the third embodiment of the present invention. In FIG. 16, the same reference numerals are given to the same parts as those in FIG. 9 described above, and detailed description thereof is omitted. In the configuration of FIG. 16, the processing up to the TS packet dividing unit 14 'is the same as the configuration of FIG. The TS packet dividing unit 14 'divides the DDB and DII supplied from the section dividing units 11 and 13, respectively, into the size of the TS packet payload (179 bytes). The divided data is supplied to the TS packetization unit 16.

  Further, when the section is divided into the size of the payload of the TS packet, the TS packet dividing unit 14 ′ counts the number of TS packets and outputs a TSP count value. The TSP count value is incremented by 1 for each TS packet from 0, for example, and is reset when the count value exceeds 254. From the next TS packet, the count continues from 0 again. The TSP count value is supplied to the adaptation information creation unit 30. The adaptation information creation unit 30 creates packet address information in the adaptation field based on the supplied TSP count value. The created packet address information is supplied to the TS packetization unit 16.

  The TS packetizing unit 16 creates a TS packet by using the data divided into the size of the payload of the TS packet by the TS packet dividing unit 14 ′ and the data of the adaptation field created by the adaptation information creating unit. At this time, a TS packet header is created, and a continuity index is embedded in the header. The created TS packet is output as transmission data 17 and broadcast by a predetermined transmission facility.

  In the third embodiment, the configuration of the receiving apparatus can be the same as that of the receiving apparatus 2 according to the first and second embodiments described with reference to FIG. However, the processing in the section construction unit 21 is slightly different between the third embodiment and the first and second embodiments described above. FIG. 17 is a flowchart showing an example of module reconstruction processing according to the third embodiment. Note that, in FIG. 17, the same reference numerals are given to portions common to FIG. 10 described above, and detailed description thereof is omitted. Here, only the parts different from the above-described FIG. 10 will be described.

  After extracting the TS packet from the received input signal in step S11, the section construction unit 21 extracts the continuity index from the header of the extracted TS packet in step S30, and calculates the TSP count value from the packet address information in the adaptation field. Take out. In step S31, the value p is calculated for the TS packet by the above-described equation (1). The calculated value p is compared with the value p calculated for the already received TS packet to obtain the relative position of the TS packet. In step S32, data is arranged based on the calculated relative position, and a section is constructed (step S16).

  In the third embodiment, the absolute position of the TS packet cannot be specified, but the TS packet can be arranged at a fixed position based on the relative position over a wide range of 4080 packets. Therefore, even if a reception environment is bad and a large number of TS packets are not correctly received due to frequent errors, TS packets can be placed at a fixed position with high probability.

  Thus, in the third embodiment of the present invention, the address space can be expanded by 1-byte data by using the continuity index defined in the TS packet.

  In the above description, the first, second, and third embodiments have been described as being implemented independently, but this is not limited to this example, and the first, second, and third embodiments are not limited to this example. It is also possible to mix the transmission methods in the form of. For example, the data transmission method can be varied for each module.

  In this case, since the number of modules that can be identified is limited to 8 in the transmission method according to the first embodiment, a module having a large size is selected from a plurality of modules, and the TS packet constituting the module is selected. A method of adding packet address information is conceivable. As described above, it is also possible to selectively provide packet address information to the modules constituting the data component.

  On the other hand, in the transmission system according to the second embodiment, the number of modules is not limited, and up to 2048 sections can be identified. Therefore, when a large number of one data component is transmitted in a small-sized module, there is no waste in how to assign section numbers, which is effective.

  As described above, when the transmission method is selected according to the property of the module, it is possible to collect sections more efficiently on the receiving side. On the receiving device 2 side, the processing is switched based on the value of the field Private_data_type in the adaptation field.

It is a figure for demonstrating an example data transmission system by a data broadcasting service. It is a figure for demonstrating an example data transmission system by a data broadcasting service. It is a figure for demonstrating an example data transmission system by a data broadcasting service. It is a figure for demonstrating an example data transmission system by a data broadcasting service. It is a figure for demonstrating an example data transmission system by a data broadcasting service. It is a basic diagram which shows the structure of an example of the packet address information in the adaptation field by the 1st Embodiment of this invention. It is a figure for demonstrating the transmission method of the section by the 1st Embodiment of this invention. It is a basic diagram which shows the structure of an example of the packet address information in the adaptation field by the 2nd Embodiment of this invention. It is a block diagram which shows roughly the structure of an example of the transmitter which can be applied in common with the 1st and 2nd embodiment of this invention. It is a block diagram which shows the structure of an example of the receiver for receiving the broadcast transmission data and reconstructing the original module. It is a flowchart which shows an example of a process which performs module reconstruction. It is a basic diagram which shows the structure of an example of the packet address information in the adaptation field by the 3rd Embodiment of this invention. It is a basic diagram for demonstrating more concretely about the combination of the period of a continuity parameter | index, and a TSP count period. It is a figure for demonstrating the expected value of the TSP count value corresponding to a continuity parameter | index. It is a figure for demonstrating calculating | requiring the position of TS packet from the relative position information of TS packet. It is a block diagram which shows roughly the structure of an example of the transmitter applicable to the 3rd Embodiment of this invention. It is a flowchart which shows a process of an example of the module reconstruction by this 3rd Embodiment. It is a figure for demonstrating reception of the section by a prior art.

Explanation of symbols

1, 1 'transmitting device 2 receiving device 10 module input unit 11 section dividing unit 12 list information creating unit 13 section dividing unit 14, 14' TS packet dividing unit 15 adaptation information creating unit 16 TS packetizing unit 21 section construction unit 22 message Classification unit 23 Module confirmation unit 24 Module construction unit 30 Adaptation information creation unit

Claims (51)

In a transmission system that cyclically transmits a plurality of packets in which data is divided and stored,
The divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are stored in the packet. Packetizing means for storing in the area;
A transmission device comprising: transmission means for transmitting the packet output from the packetization means;
Receiving means for receiving the packet transmitted from the transmitting means;
The information indicating the type of the packet address information and the packet address information are extracted from the predetermined area of the packet received by the receiving means, and the packet address is based on the extracted information indicating the type of the packet address information. A transmission system comprising: a receiving device including data placement means for placing the divided data at an address indicated by the packet address information using information. The transmission system according to claim 1, wherein
The data is divided hierarchically with the packet at the bottom.
The transmission system according to claim 1, wherein the packet address information is of a type indicating an address for an upper layer. The transmission system according to claim 2, wherein
A transmission system characterized in that the packet address information limits the number of addresses that can be indicated. The transmission system according to claim 2, wherein
The packetization means does not store the packet address information and information indicating the type of the packet address information for the packet in which the divided data including the head portion of the data is stored. Transmission system. The transmission system according to claim 1, wherein
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the packet address information is a combination of the first cycle and the second cycle. 3. A transmission system characterized in that the divided data is indicated by an address on the data in a cycle of 3. The transmission system according to claim 1, wherein
The data is divided hierarchically with the packet at the bottom.
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information of the first type indicates an address for the upper layer,
The packet address information of the second type is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the first cycle and the second cycle An address on the data of the divided data is shown in a third cycle combining the cycles,
The transmission device mixes the packet storing the packet address information of the first type and the packet storing the packet address information of the second type in units of the data. A transmission system characterized by being able to transmit. The transmission system according to claim 1, wherein
The packet is a transport packet defined in MPEG, and the data is divided into modules of an arbitrary size, the module is further divided into blocks of a predetermined size, and a header and an error detection code are included in the block. A transmission system, wherein the attached section is further divided into the payload size of the transport packet and transmitted. The transmission system according to claim 7,
The transmission system, wherein the predetermined area in which the packet address information and information indicating the type of the packet address information are stored is an adaptation field in the transport stream. The transmission system according to claim 7,
The packet address information includes: first address information indicating an address of the module in the data; second address information indicating an address of the section for the module indicated by the first address information; And a third address information indicating an address of the transport packet for the section indicated by the address information of 2. The transmission system according to claim 9, wherein
A transmission system characterized in that the packet address information limits the number of addresses that can be indicated by the first and second address information. The transmission system according to claim 9, wherein
The transmission system according to claim 1, wherein the packetizing means does not store the packet address information and information indicating the type of the packet address information for the transport packet including the header of the section. The transmission system according to claim 7,
The packet address information includes first address information indicating an address of the section in the data, and second address information indicating an address of the transport packet for the section indicated by the first address information. A transmission system characterized by having a type. The transmission system according to claim 12, wherein
The transmission system according to claim 1, wherein the packetizing means does not store the packet address information and information indicating the type of the packet address information for the transport packet including the header of the section. The transmission system according to claim 7,
The packet address information is a value that circulates in a second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not a mutual period itself. A transmission system characterized in that an address on the data of the transport packet is indicated by a third period obtained by combining one period and the second period. The transmission system according to claim 14, wherein
The transmission system according to claim 1, wherein the second period is a period represented by a bit value smaller by 1 than a maximum bit value of an area allocated to the predetermined area for the second period. The transmission system according to claim 7,
The packet address information of the first type includes first address information indicating the address of the module in the data, and a second address indicating the address of the section for the module indicated in the first address information. Information, and third address information indicating the address of the transport packet for the section indicated in the second address information,
The second type of the packet address information includes first address information indicating the address of the section in the data, and a second address indicating the address of the transport packet for the section indicated by the first address information. Address information,
The packet address information of the third type is a value that circulates in the second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not the mutual period itself. And indicates the address on the data of the transport packet in a third period that combines the first period and the second period,
The transmission apparatus includes the transport packet in which the packet address information of the first type is stored, the transport packet in which the packet address information of the second type is stored, and the third type. A transmission system characterized in that the transport packet storing the packet address information can be mixedly transmitted in units of modules. In a transmission method for cyclically transmitting a plurality of packets in which data is divided and stored,
The divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are stored in the packet. Packetization step to store in the area;
A transmission step for transmitting the packet output by the packetizing step; a reception step for receiving the packet transmitted from the transmission step;
The information indicating the type of the packet address information and the packet address information are extracted from the predetermined area of the packet received in the receiving step, and the packet is based on the extracted information indicating the type of the packet address information. And a data arrangement step of arranging the divided data at an address indicated by the packet address information using address information. In a transmission device that cyclically transmits a plurality of packets in which data is divided and stored,
The divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are stored in the packet. Packetizing means for storing in the area;
A transmission apparatus comprising: transmission means for transmitting the packet output from the packetization means. The transmission device according to claim 18, wherein
The data is divided hierarchically with the packet at the bottom.
The transmission apparatus according to claim 1, wherein the packet address information is of a type indicating an address for an upper layer. The transmission device according to claim 19,
The transmission apparatus characterized in that the packet address information limits the number of addresses that can be indicated. The transmission device according to claim 19,
The packetization means does not store the packet address information and information indicating the type of the packet address information for the packet in which the divided data including the head portion of the data is stored. Transmitting device. The transmission device according to claim 18, wherein
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the packet address information is a combination of the first cycle and the second cycle. A transmitting apparatus characterized in that it is of a type in which an address on the data of the divided data is shown in a cycle of 3. The transmission device according to claim 18, wherein
The data is divided hierarchically with the packet at the bottom.
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information of the first type indicates an address for the upper layer,
The packet address information of the second type is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the first cycle and the second cycle An address on the data of the divided data is shown in a third cycle combining the cycles,
The packet in which the packet address information of the first type is stored and the packet in which the packet address information of the second type is stored can be mixed and transmitted in units of the data. Transmitting device. The transmission device according to claim 18, wherein
The packet is a transport packet defined in MPEG, and the data is divided into modules of an arbitrary size, the module is further divided into blocks of a predetermined size, and a header and an error detection code are included in the block. The transmission apparatus, wherein the attached section is further divided into the payload size of the transport packet and transmitted. The transmission device according to claim 24,
The transmission apparatus, wherein the predetermined area in which the packet address information and information indicating the type of the packet address information are stored is an adaptation field in the transport stream. The transmission device according to claim 24,
The packet address information includes: first address information indicating an address of the module in the data; second address information indicating an address of the section for the module indicated by the first address information; And a third address information indicating the address of the transport packet for the section indicated by the address information of 2. The transmission device according to claim 26, wherein
The transmission apparatus characterized in that the packet address information limits the number of addresses that can be indicated by the first and second address information. The transmission device according to claim 26, wherein
The transmission apparatus according to claim 1, wherein the packetizing means does not store the packet address information and information indicating the type of the packet address information for the transport packet including the header of the section. The transmission device according to claim 24,
The packet address information includes first address information indicating an address of the section in the data, and second address information indicating an address of the transport packet for the section indicated by the first address information. A transmission device characterized by having a type. The transmission device according to claim 29,
The transmission apparatus according to claim 1, wherein the packetizing means does not store the packet address information and information indicating the type of the packet address information for the transport packet including the header of the section. The transmission device according to claim 24,
The packet address information is a value that circulates in a second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not a mutual period itself. A transmission apparatus characterized in that an address on the data of the transport packet is indicated by a third period obtained by combining one period and the second period. The transmission device according to claim 31, wherein
The transmission apparatus according to claim 1, wherein the second period is a period represented by a bit value smaller by 1 than a maximum bit value of an area allocated to the predetermined area for the second period. The transmission device according to claim 24,
The packet address information of the first type includes first address information indicating the address of the module in the data, and a second address indicating the address of the section for the module indicated in the first address information. Information, and third address information indicating the address of the transport packet for the section indicated in the second address information,
The second type of the packet address information includes first address information indicating the address of the section in the data, and a second address indicating the address of the transport packet for the section indicated by the first address information. Address information,
The packet address information of the third type is a value that circulates in the second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not the mutual period itself. And indicates the address on the data of the transport packet in a third period that combines the first period and the second period,
The transport packet storing the first type of packet address information, the transport packet storing the second type of packet address information, and the third type of packet address information. A transmission apparatus characterized in that the transport packet in which the message is stored can be mixed and transmitted in units of modules. In a transmission method for cyclically transmitting a plurality of packets in which data is divided and stored,
The divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are stored in the packet. Packetization step to store in the area;
And a transmission step of transmitting the packet output in the packetizing step. In a receiving apparatus for receiving a plurality of packets in which data is divided and stored in a cyclic manner,
Divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are predetermined for the packet. Receiving means for receiving the packet stored and transmitted in the area;
The information indicating the type of the packet address information and the packet address information are extracted from the predetermined area of the packet received by the receiving means, and the packet address is based on the extracted information indicating the type of the packet address information. And a data placement unit that places the divided data at an address indicated by the packet address information using information. The receiving device according to claim 35,
The data is divided hierarchically with the packet at the bottom.
The receiving apparatus according to claim 1, wherein the packet address information is of a type indicating an address for an upper layer. The receiving device according to claim 36,
The receiving apparatus, wherein the packet address information is limited in number that can indicate the address. The receiving device according to claim 36,
The receiving apparatus, wherein the packet address information and the information indicating the type of the packet address information are not stored for the packet in which the divided data including the head portion of the data is stored. The receiving device according to claim 35,
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the packet address information is a combination of the first cycle and the second cycle. A receiving apparatus characterized in that an address on the data of the divided data is indicated in a cycle of 3. The receiving device according to claim 35,
The data is divided hierarchically with the packet at the bottom.
Information indicating the continuity of the packet as the value circulates in the first period is further stored in another predetermined area of the packet,
The packet address information of the first type indicates an address for an upper layer,
The packet address information of the second type is a value that circulates in a second cycle such that the greatest common divisor with the first cycle is not the cycle itself, and the first cycle and the second cycle An address on the data of the divided data is indicated in a third period combining the periods,
The packet storing the packet address information of the first type and the packet storing the packet address information of the second type are mixedly transmitted in units of the data. A receiving device. The receiving device according to claim 35,
The packet is a transport packet defined in MPEG, and the data is divided into modules of an arbitrary size, the module is further divided into blocks of a predetermined size, and a header and an error detection code are included in the block. A receiving apparatus, wherein the attached section is further divided into the size of the payload of the transport packet and transmitted. The receiving device according to claim 41,
The receiving apparatus, wherein the predetermined area in which the packet address information and information indicating the type of the packet address information are stored is an adaptation field in the transport stream. The receiving device according to claim 41,
The packet address information includes: first address information indicating an address of the module in the data; second address information indicating an address of the section for the module indicated by the first address information; And a third address information indicating the address of the transport packet corresponding to the section indicated by the address information of the second address information. The receiving device according to claim 43,
The packet address information has a limited number of addresses that can be indicated by the first and second address information, respectively. The receiving device according to claim 43,
The receiving apparatus, wherein the packet address information and information indicating a type of the packet address information are not stored for the transport packet including the header of the section. The receiving device according to claim 41,
The packet address information includes first address information indicating an address of the section in the data, and second address information indicating an address of the transport packet for the section indicated by the first address information. A receiving apparatus characterized by having a type. The receiving device according to claim 46,
The receiving apparatus, wherein the packet address information and information indicating a type of the packet address information are not stored for the transport packet including the header of the section. The receiving device according to claim 41,
The packet address information is a value that circulates in a second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not a mutual period itself. A receiving apparatus characterized in that an address on the data of the transport packet is indicated by a third period obtained by combining one period and the second period. 49. The receiving device according to claim 48, wherein
The receiving apparatus according to claim 1, wherein the second period is a period represented by a bit value smaller by 1 than a maximum bit value of an area allocated to the predetermined area for the second period. The receiving device according to claim 41,
The packet address information of the first type includes first address information indicating the address of the module in the data, and a second address indicating the address of the section for the module indicated in the first address information. Information, and third address information indicating the address of the transport packet for the section indicated in the second address information,
The second type of the packet address information includes first address information indicating the address of the section in the data, and a second address indicating the address of the transport packet for the section indicated by the first address information. Address information,
The packet address information of the third type is a value that circulates in the second period such that the greatest common divisor with the first period of the continuity index stored in the header of the transport packet is not the mutual period itself. And the address on the data of the transport packet is indicated by a third period combining the first period and the second period,
The transport packet storing the first type of packet address information, the transport packet storing the second type of packet address information, and the third type of packet address information. The transport packet in which is stored is transmitted in a unit of the module. In a receiving method for receiving a plurality of packets that are transmitted cyclically and in which data is divided and stored,
Divided data obtained by dividing the data into packets is stored in the packet, and packet address information indicating the address of the divided data on the data and information indicating the type of the packet address information are predetermined for the packet. A receiving step of receiving the packet stored and transmitted in the area;
The information indicating the type of the packet address information and the packet address information are extracted from the predetermined area of the packet received in the receiving step, and the packet is based on the extracted information indicating the type of the packet address information. And a data arrangement step of arranging the divided data at an address indicated by the packet address information using address information.

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