JP2000151737A - Data transmitter and data receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit the tracing of a directory so as to shorten receiving time by storing a direct reference dictionary for directly obtaining an object key from a data file name at the time of receiving a data file, and in the case of receiving a succeeding data file, referring to the dictionary. SOLUTION: An expanded area is defined in a DII based on DSM-CC standards and a direct reference dictionary is stored in an area opened to users. The direct reference dictionary has contents allowing module identification numbers to correspond to respective object keys in each data file, and when a data file name in the dictionary is referred to, an object key for accessing the file can be immediately obtained. A transmission part multiplexes direct reference keys related to respective transmission units and continues to transmit the multiplexed dictionary circularly and repeatedly. At the time of receiving a certain data file, a receiving part separates the multiplexed relational direct reference dictionary and stores respective separated dictionaries.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmitting apparatus and a data receiving apparatus for transmitting and receiving data files represented by a directory structure, and more particularly, to efficiently transmitting and receiving a plurality of data files to be used simultaneously or continuously. Related to the technology to be performed.

[0002]

FIG. 26 is a schematic diagram of a data transmission / reception system. The data transmission / reception system shown in FIG. 26 includes a broadcast station 901, a broadcast satellite 902, a portable terminal 903, and
It comprises a stationary terminal 904. Digital data in which video, audio, program information, and other various data are multiplexed are transmitted from the broadcast station 901 to a broadcast wave and transmitted.
The broadcast wave carrying the digital data is broadcast satellite 902
The mobile terminal 903 and the stationary terminal 90
4 and the necessary data is extracted and used.

At present, in such a data transmission / reception system, MPEG2 (Moving Picture Image Codin) is mainly used.
g Experts Group 2) Transport streams are used. MPEG2 is standardized by ISO / ICE13181, and furthermore, ISO / ICE13181-6: Extensions for DSM-
The CC defines a control protocol for downloading data.

[0004] The DSM-CC standard defines a flow control method and a non-flow control method.
Data transmission / reception by the flow control method exchanges control information with each other and is suitable for local data transmission / reception because there is little waste. However, such as digital broadcasting which broadcasts similar data to a large number of recipients at once. Not suitable for data transmission and reception. On the other hand, data transmission / reception by the non-flow control method is suitable for data transmission / reception such as digital broadcasting since control information is not transmitted from the receiving side to the transmitting side.

In the non-flow control system defined in the DSM-CC standard, a data carousel system (DSM-CC-UN) and an object carousel system (DSM-CC-UU) are defined as data distribution methods. Here, the data carousel system is a standard that includes the object carousel system. The data carousel system continuously and repeatedly transmits data to be transmitted from a transmitting side, and a receiver can start receiving data with almost no waiting. The details of the data carousel method are described in Chapters 1 and 7 of ISO / ICE13181-6, so please refer to it.

[0006] The object carousel method is an extension of the data carousel method as described below so that files having a directory structure can be transmitted. 1. Definition of BIOP message: Data sent and received is independent for each module, and each module is composed of multiple BIOP messages.
Consists of a message.

FIG. 27 is a diagram showing a module composed of a plurality of BIOP messages. BIOP messages include
Four object types are defined: a directory object, a file object, a stream object, and a service gateway (SGW). A directory object is the name of another object connected directly under the corresponding directory,
Contains an identifier that identifies the BIOP message corresponding to the name. The file object includes file data or bitmap data. The stream object includes a reference to stream data transmitted by broadcasting or the like. A service gateway is similar to a directory object and can be thought of as a special directory object that indicates the root of the directory structure.

In the present specification, for simplification of the description, the invention will be described with the service gateway as a kind of directory object and the stream object as a kind of file object. FIG. 28 is a diagram showing the definition of a directory object. FIG. 29 is a diagram showing the definition of a file object. 2. Definition of IOP :: IOR: FIG. 30 is a diagram showing the definition of IOP :: IOR.

Each BIOP message has an identifier IOP :: IOR (hereinafter referred to as “identifier IOR”) such as a download ID, a module ID, and an object key in its own header. Each BIOP message is identified. FIG. 31 is a diagram showing the definition of BIOP :: ObjectLocation, which is a main element of the identifier IOR in the object carousel method.

FIG. 32 is a diagram schematically showing a conventional method of referring to a file message from a file name (key list) in the object carousel system. The data carousel method is described in Chapters 2, 7, and 9 of ISO / ICE13181-6, and the object carousel method is described in Chapters 4, 5, and 11 of ISO / ICE13181-6.

Since FIGS. 26 to 32 are existing standards, detailed description is omitted. <Conventional Transmission Apparatus> FIG. 33 is a diagram showing the configuration of a conventional transmission apparatus for transmitting a file having a directory structure by the object carousel method. The transmitting apparatus 100 shown in FIG. 33 includes an indirect reference block storage unit 101, an indirect reference block read unit 102, and a data block storage unit 10.
3. It includes a data block reading unit 104, a multiplexing unit 105, a data transmitting unit 106, and an antenna 107.

The indirect reference block storage unit 101 stores an indirect reference block. Here, the indirect reference block is a block indicating, for each directory, all directory names and file names connected immediately below the directory. The indirect reference block reading unit 102 reads an indirect reference block from the indirect reference block storage unit 101.

The data block storage section 103 stores data blocks. Here, the data block is a block including one data file. The data block reading unit 104 reads a data block from the data block storage unit 103. The multiplexing unit 105 multiplexes all the indirect reference blocks and the data blocks to generate digital stream data. In detail, the read indirect reference block and the data block are allocated to several modules, a module identification number is added for each module, different object keys are added in the same module, and each module is transmitted in units of transmission. Is divided into DDBs.

The data transmitting section 106 transmits the digital stream data to the antenna 10 in an object carousel system.
Broadcast through 7 <Conventional Receiving Apparatus> FIG. 34 is a diagram showing the configuration of a conventional receiving apparatus for receiving a file having a directory structure by the object carousel method.

A receiving apparatus 150 shown in FIG. 34 includes a receiving antenna 151, a data receiving unit 152, a data block selecting unit 153, a data separating unit 154, an indirect reference block selecting unit 155, a reference dictionary obtaining unit 156, and an identifier indirect obtaining unit 1.
57, and a key information selection unit 158. The data receiving unit 152 receives the broadcasted object carousel data via the reception antenna 151 and restores the data to digital stream data.

The data separation unit 154 extracts an indirect reference block and a data block from the digital stream data, and converts the indirect reference block into the indirect reference block selection unit 1.
55, the data block is selected from the data block selection unit 153.
Output to The key information selection unit 158 is a key list buffer 1 for temporarily storing a reference name input from the terminal A.
59, the directory name and the file name (key) are sequentially selected from the reference names stored in the key list buffer 159, and output to the identifier indirect acquisition unit 157. For example,
Assuming that the reference name is “〜 / abc / def / ghi”, the key information selection unit 158 selects four keys “〜”, “abc”, “def”, and “ghi” in order. Note that "~" means the SGW (ServiceGateway) which is the root of the directory structure, and "/" means a layer break.

The identifier indirect acquisition unit 157 stores the identifier IOR associated with the key output by the key information selection unit 158.
Is selected from the indirect reference dictionary output by the reference dictionary acquisition unit 156, and is output to the indirect reference block selection unit 155 and the data block selection unit 153. However, when the key is “〜”, since the indirect reference dictionary is not output, the identifier IOR of the SGW (ServiceGateway) is selected by a separately defined method. Here, the method of selecting the SGW identifier IOR is not related to the gist of the present invention, and therefore the description is omitted.

The indirect reference block selection unit 155 selects a directory object corresponding to the identifier IOR output by the identifier indirect acquisition unit 157 from the indirect reference block output by the data separation unit 154, and obtains a reference dictionary acquisition unit 156.
Output to The reference dictionary acquisition unit 156 converts the directory object into a BIOP :: Directory Message Body (indirect reference dictionary) indicating the relationship between the partial reference name and the identifier IOR.
And outputs it to the identifier indirect acquisition unit 157.

The data block selection unit 153 selects a file object corresponding to the identifier IOR output by the identifier indirect acquisition unit 157 from the data blocks output by the data separation unit 154, and outputs the selected file object from the terminal B to the outside. Each time the reference name is input from the terminal A, the receiving device 150
The process is repeated until the file object is output from the terminal B to the outside or until the process by all keys is completed.

[0020]

As described above, in the conventional receiving method of receiving a file having a directory structure by the object carousel method, an indirect reference block is received by the number of directories until a target file object is received. The process of selecting a directory object must be repeated to traverse the directory, and the process is complicated and the receiving time is long. Also,
Since data is transmitted cyclically and repeatedly, a period wait occurs, and the reception time is longer and fluctuates.

Therefore, in order to reduce the receiving time even a little, the transmitting side transmits a plurality of data files (hereinafter, referred to as “simultaneously used files”) that are likely to be received continuously by the same module, On the receiving side, there is an attempt to cache each module when the module is reproduced, and to reduce the time from receiving a certain data file to receiving a simultaneous use file.

FIG. 35 is a diagram showing an example in which simultaneous use files are transmitted by the same module. However, it is still necessary to follow the directory, and even if there are no simultaneous files in the cache, the data in the cache must be retained until the search is completed, and the cache can be used effectively. I can no longer do it.

Therefore, the present invention has been made in view of such a problem, and when transmitting and receiving data files expressed in a directory structure, it is possible to efficiently transmit and receive a plurality of data files to be used simultaneously or continuously. It is an object of the present invention to provide a data transmission device, a data reception device, a data transmission method, a data reception method, a storage medium storing these methods, and a storage medium recording transmission / reception data, which can be performed in an efficient manner.

[0024]

In order to achieve the above object, a data transmitting apparatus according to the present invention is a data transmitting apparatus for transmitting a file system having a directory structure. The identifier of the data block corresponding to the data file is specified from the name of the data file connected to, and the identifier of the indirect reference block corresponding to the two directories is specified from the name of the two directories connected immediately below the one directory A plurality of indirect reference blocks including an indirect reference dictionary specifying the own identifier, a plurality of data blocks including a data file and the own identifier, and data corresponding to the reference name directly from the reference name starting from a predetermined directory name Get one or more direct reference dictionaries that specify block identifiers Obtaining means, multiplexing means for multiplexing the obtained indirect reference block, the obtained data block, and the obtained data of the direct reference dictionary to generate multiplexed data, and transmitting means for transmitting the multiplexed data And characterized in that:

Thus, since the multiplexed data in which the reference dictionary is multiplexed is directly transmitted, the data receiving apparatus that receives the multiplexed data can directly specify the identifier of the data block from the reference name. Therefore, the time required for the transmission / reception processing is reduced. Further, a data receiving apparatus according to the present invention is a data receiving apparatus that receives a file system having a directory structure and obtains a data file corresponding to a reference name starting from a predetermined directory name. Storage means for storing a direct reference dictionary that includes an identifier and directly specifying an identifier of a data block corresponding to the reference name from the reference name; reference name obtaining means for obtaining a reference name of a data file to be obtained; Each time, the identifier of the data block corresponding to the data file is specified from the name of the data file connected immediately under one directory, and the name of the two directories connected immediately under the one directory is changed to the two directories. An indirect reference dictionary that identifies the identifier of the corresponding indirect reference block Receiving means for receiving multiplexed data obtained by multiplexing a plurality of indirect reference blocks including a plurality of identifiers, a plurality of data blocks, and one or more data of the direct reference dictionary; A separating unit for extracting and outputting the reference block, the data block, and the data of the direct reference dictionary; and a direct reference when the direct reference dictionary stored in the storage unit includes the reference name obtained by the reference name obtaining unit. Direct reference means for outputting the identifier of the data block specified directly from the reference name based on the dictionary; and, if the reference name obtained by the reference name acquisition means is not included in the direct reference dictionary stored in the storage means, Key information generating means for generating and outputting key information by separating the directory name and file name of the reference name, and the key information output from the key information generating means In the case of a directory name, an indirect reference unit that outputs an identifier of an indirect reference block of a predetermined directory, and an indirect reference corresponding to the key information from an indirect reference block output from the separating unit based on the identifier output by the indirect reference unit Indirect reference block selecting means for selecting a block, and indirect reference dictionary extracting means for extracting an indirect reference dictionary from the selected indirect reference block, wherein the indirect reference means has no key information output from the key information generating means. In this case, the process of searching for and outputting the identifier corresponding to the key information from the indirect reference dictionary extracted by the indirect reference dictionary extracting unit is repeated until the identifier of the data block is searched, and the data receiving apparatus further comprises: And the data block output from the separation means based on the identifier output by the indirect reference means A data block corresponding to the key information and extracting a data file from the selected data block; and a direct reference dictionary corresponding to the data block from data of the direct reference dictionary output from the separating unit. It is characterized by comprising direct reference dictionary selecting means for selecting data, and updating means for storing data of the selected direct reference dictionary in the storage means.

Thus, when the reference name is included in the direct reference dictionary, the identifier of the data block can be directly specified from the reference name. When the reference name is not included in the direct reference dictionary, Identifying the data block identifier by tracing the indirect reference dictionary, and acquiring and storing the direct reference dictionary for the data block to be selected later.

Therefore, when a data block is first selected, a direct reference dictionary for a data block to be selected later is stored. Therefore, when a data block is selected later, a direct reference dictionary is directly obtained from a reference name without tracing an indirect reference dictionary. The identifier of the data block can be specified, and the time required for the reception processing is reduced. As is apparent from the above description, the computer-readable storage medium storing transmission / reception data according to the present invention is a computer-readable storage medium storing transmission / reception data for transmitting / receiving a file system having a directory structure. For each directory, the identifier of the data block corresponding to the data file is specified from the name of the data file connected immediately below the one directory, and the identifier of the two directories connected immediately below the one directory is specified. A plurality of indirect reference blocks including an indirect reference dictionary that specifies the identifier of the indirect reference block corresponding to the directory and the own identifier, a plurality of data blocks including the data file and the own identifier, and a predetermined directory name. A reference name that starts with a reference name And one or more direct reference dictionary data is information specifying the identifier of the data block to be to record received data, characterized by being multiplexed.

Since the reference dictionary is directly multiplexed in the transmission / reception data, the data receiving apparatus that receives the transmission / reception data can directly specify the identifier of the data block from the reference name. Therefore, the time required for the transmission / reception processing is reduced.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Embodiment 1) <Outline> In Embodiment 1 of the present invention, when a data file represented by a directory structure is transmitted and received, the transmitting side directly obtains a reference name of the data file which will be received later. The direct reference dictionary from which the identifier is obtained is inserted in advance in the stream that will be received in the process of receiving the data file that will be received first, and the receiving side of the data file that has been previously received is The reference dictionary is extracted and held directly during the receiving process, and when the data file to be received later is received, the reference name is referred to by referencing the held direct reference dictionary without performing the process of tracing the directory. The identifier is obtained directly from. Thereby, the reception time can be shortened comprehensively.

<Configuration of Transmitting Apparatus> FIG. 1 shows a configuration of the transmitting apparatus according to Embodiment 1 of the present invention. FIG.
The transmission device 200 shown in FIG.
1, indirect reference block reading section 102, data block storage section 103, data block reading section 104, multiplexing section 2
05, a data transmission unit 106, an antenna 107, a direct reference dictionary storage unit 211, a direct reference dictionary read unit 212,
A direct reference block generation unit 213 is provided.

Here, those having the same functions as those of the components of the conventional transmitting apparatus 100 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 2 is a diagram showing an MHEG (ISO / IEC13522-5) program. FIG. 3 shows three data files "~ / display", "~ / bitmap.png", "~ / media / audi" used simultaneously or successively in the MHEG program shown in FIG.
o.aif ", an SGW (ServiceGateway), and a directory object" ~ / media ".

Here, as shown in FIG. 3, SGW (Servic
eGateway), “~ / display” and “~ / bitmap”
Id1 and “~ / media / audio.aif” and “~ / media”
ModuleId2. When the modules are allocated in this way and transmitted collectively on a module basis, it is expected that the receiving side will be able to receive efficiently. Also, a module identification number is added for each module, and the object keys in each module are set to “K0”, “K1”, “K2”. 4 and 5 are diagrams showing the contents of each object.

The direct reference dictionary storage section 211 stores a direct reference dictionary. FIG. 6 is a diagram illustrating a direct reference dictionary stored in the direct reference dictionary storage unit 211. This direct reference dictionary associates a module identification number with an object key for each data file. The direct reference dictionary reading unit 212 reads a direct reference dictionary.

The direct reference block generator 213 converts the format of the direct reference dictionary read by the direct reference dictionary reader 212 to generate a multiplexable direct reference block. The multiplexing unit 205 generates digital stream data by multiplexing all of the indirect reference block, the data block, and the direct reference block. More specifically, the read indirect reference block, data block, and direct reference block are allocated to several modules, a module identification number is added for each module, and different object keys are added in the same module. Is divided into DDBs, which are transmission units.

Next, how to generate and multiplex a direct reference block will be described in more detail. In the present embodiment, a part of the DSM of the DSM-CC-UN is used as a direct reference block. According to the DSM-CC standard, DII is a stream that transmits module transmission information.

In the DII, an extension area “ModuleInfoByte: MI
B ”is defined, and MIB in DSM-CC-UU
Defines "BIOP :: ModuleInfo" for specifying a PID to which a DDB is to be transmitted for each module. Figure 7 shows BIOP ::
FIG. 8 is a diagram showing the definition of ModuleInfo, and FIG. 8 is a diagram showing an example of the transmission format.

As shown in FIG. 7, BIOP :: ModuleInfo defines an area "userInfo" open to the user.
In the present embodiment, the contents of the reference dictionary are directly stored in the “userInfo”. Fig. 9 shows the contents of the direct reference dictionary as userIn
Format “directDictionaryIn” when stored in fo
7 is a diagram showing “fo”, where “fullname” indicates “reference name” in the direct reference dictionary shown in FIG.
By referring to “rectDictionaryInfo”, the object key can be directly obtained from “reference name”.

FIG. 10 shows the "directDictiona" shown in FIG.
11 is an example of a format for transmitting BIOP :: ModuleInfo in which “ryInfo” is inserted. FIGS. 11, 12, and 13 are generated based on the direct reference dictionary shown in FIG. 6 by the processing of this embodiment. <Operation of transmitting apparatus> Fig. 14 shows transmitting apparatus 20 according to Embodiment 1 of the present invention.
0 is a diagram showing a flowchart of a process of transmitting digital data.

Here, the operation of transmitting apparatus 200 will be described with reference to FIG. (1) The indirect reference block reading unit 102 reads the indirect reference block from the indirect reference block storage unit 101, the data block reading unit 104 reads the data block from the data block storage unit 103, and the direct reference dictionary reading unit 212 reads the direct reference dictionary storage unit. The reference dictionary is read directly from 211 (step S1). (2) The direct reference block generation unit 213 generates a direct reference block based on the read direct reference dictionary (step S2). (3) The multiplexing unit 205 sorts the read indirect reference block, data block, and generated direct reference block into some modules, adds a module identification number for each module, and Different object keys are added, and each module is divided into DDBs, which are transmission units (step S
3). (4) The data transmission unit 106 continuously transmits the DDB cyclically and repeatedly (step S4).

When a data file is received, the process of tracing a directory is not required as long as the data file is referred to directly. <Structure of Receiving Apparatus> FIG. 15 shows a structure of the receiving apparatus according to the first embodiment of the present invention. The receiving device 250 shown in FIG.
52, data block selection unit 253, data separation unit 25
4. Indirect reference block selection unit 155, reference dictionary acquisition unit 1
56, identifier indirect acquisition unit 257, key information selection unit 25
8, a direct reference block selection unit 261, a direct reference dictionary restoration unit 262, a direct reference dictionary storage unit 263, and an identifier direct acquisition unit 264.

Here, components having the same functions as those of the components of the conventional receiving apparatus 150 are denoted by the same reference numerals, and description thereof will be omitted. Here, the receiving device 250 is the transmitting device 2
It is assumed that the digital stream data multiplexed with the direct reference block, the indirect reference block, and the data block transmitted from 00 is received.

The data separation unit 254 extracts the indirect reference block, the direct reference block, and the data block from the digital stream data, and sends the indirect reference block to the indirect reference block selection unit 155, including the DI including the direct reference block.
I is directly output to the reference block selection unit 261 and the data block is output to the data block selection unit 253. Here, the direct reference block is “directDictionaryInf” in the DII MIB.
o ”.

The identifier indirect acquisition unit 257 stores the identifier IOR associated with the key output by the key information selection unit 258.
Is selected from the indirect reference dictionary output by the reference dictionary acquisition unit 156, and is output to the direct reference block selection unit 261, the indirect reference block selection unit 155, and the data block selection unit 253. The direct reference block selection unit 261 outputs the identifier indirect acquisition unit 2 from the DII output by the data separation unit 254.
The MIB of the module specified by the identifier IOR output by 57 is selected, and both the identifier IOR and the MIB are directly output to the reference dictionary restoration unit 262.

The direct reference dictionary restoring unit 262 converts the “directDiction” from the MIB output by the direct reference block selecting unit 261.
aryInfo ”is extracted and the direct reference dictionary is restored based on the extracted information. The direct reference dictionary storage unit 263 holds the restored direct reference dictionary. Here, after the direct reference dictionary is held, a new direct reference is performed. When the dictionary is restored, the oldest one is deleted and the newest one is retained with priority.

The identifier direct acquisition unit 264 searches for the reference name stored in the key list buffer 259 from the direct reference dictionary stored in the direct reference dictionary storage unit 263, and if the search is successful, it corresponds to the reference name. An identifier IOR is generated from the ModuleId and the object key and output to the data block selection unit 253. If the search fails, the fact is notified to the identifier indirect acquisition unit 257 so that the conventional processing is performed.

The data block selection unit 253 selects a file object corresponding to the identifier IOR output from the identifier indirect acquisition unit 257 or the identifier direct acquisition unit 264 from the data blocks output from the data separation unit 254, Output to <Operation of Receiver> Here, the MHEG (ISO / I
EC13522-5) A case where a program is received and executed will be described as an example.

FIG. 16 shows the Modu transmitted by the transmitting apparatus 200.
It is a figure which shows the inside of leId1 and ModuleId2. First, FIG.
In order to execute the MHEG program shown in FIG.
0 is the file object of the file data "~ / displ
ay ”is read in. FIG. 17 is a diagram showing a flowchart of a process in which the receiving device 250 according to the first embodiment of the present invention receives the file object“ 〜 / display ”of the file data.

The operation at this time will be described below. (1) The identifier direct acquisition unit 264 attempts to search for the reference name “〜 / display” stored in the key list buffer 259 from the direct reference dictionary stored in the direct reference dictionary storage unit 263. However, the direct reference dictionary storage unit 263
In this case, the search fails because the direct reference dictionary is not stored at this time, and the fact is notified to the identifier indirect acquisition unit 257, and the conventional processing is immediately performed (Step S).
11). (2) The indirect identifier acquisition unit 257 is the key information selection unit 25
8 based on the key “~” output by the SGW identifier IOR
Is output to the direct reference block selection unit 261, the indirect reference block selection unit 155, and the data block selection unit 253 (step S12). (3) The direct reference block selection unit 261 that has received the SGW identifier IOR selects the MIB of the module specified by the identifier IOR output by the identifier indirect acquisition unit 257 from the DII output by the data separation unit 254, This identifier IOR and MIB
Are output directly to the reference dictionary restoring unit 262 (step S13). (4) ModuleId1 transmitted from transmitting apparatus 200
In FIG. 1, "SGW", "~ / display", and "~ / bitmap.png" are put together as shown in FIG.
As shown in FIG. 1, “directDict” in the MIB of the corresponding DII
ionaryInfo ”contains“ ~ / display ”and“ ~ / bitmap.pn
g ”, the direct reference dictionary restoring unit 262 outputs the direct reference block selecting unit 2
The “directDictionaryInfo” is extracted from the MIB output by the 61, the direct reference dictionary is restored based on this, and the direct reference dictionary storage unit 263 holds the restored direct reference dictionary (step S14). (5) The indirect reference block selection unit 155 that has received the SGW identifier IOR outputs the identifier output by the identifier indirect acquisition unit 257 from the indirect reference block output by the data separation unit 254.
A directory object corresponding to the IOR is selected and output to the reference dictionary acquisition unit 156 (step S15). (6) The indirect identifier acquisition unit 257 is used by the key information selection unit 25
Identifier I associated with the key "display" output by 8
The OR is selected from the indirect reference dictionary output from the reference dictionary acquisition unit 156, and is output to the direct reference block selection unit 261, the indirect reference block selection unit 155, and the data block selection unit 253 (step S16). (7) The data block selection unit 253 determines that the data separation unit 2
The file object “が / display” corresponding to the identifier IOR output by the identifier indirect acquisition unit 257 is selected from the data blocks output by the terminal 54, and is output from the terminal B to the outside (step S17).

Thereafter, the execution of the MHEG program shown in FIG. 2 proceeds, and the file object "~ / bitmap.png" of bitmap data used for drawing is read. FIG.
8 shows a process of receiving the file object “の /bitmap.png” of the bitmap data after the receiving device 250 according to the first embodiment of the present invention receives the file object “〜 / display” of the file data. It is a figure which shows a flowchart.

The operation at this time will be described below. (1) The identifier direct acquisition unit 264 attempts to retrieve the reference name ““ /bitmap.png ”stored in the key list buffer 259 from the direct reference dictionary stored in the direct reference dictionary storage unit 263. Then, since the direct reference dictionary is stored in the direct reference dictionary storage unit 263 at this time, the search is successful, and the ModuleI corresponding to the reference name “~ / bitmap.png” is obtained.
An identifier IOR is generated from d and the object key and output to the data block selection unit 253 (step S21). (2) The data block selection unit 253 is
The file object “が /bitmap.png” corresponding to the identifier IOR output by the identifier direct acquisition unit 264 is selected from the data block output by the terminal 54, and output from the terminal B to the outside (step S22).

Thereafter, the execution of the MHEG program shown in FIG. 2 further proceeds, and the directory object “〜 / media” is received in the same manner as the processing shown in FIG. 17, and at this time, the stream object “〜 / media” of the audio stream is received. med
The direct reference dictionary relating to “ia / audio.aif” is restored and held. Then, similarly to the processing shown in FIG.
io.aif ”is received.

As described above, in the first embodiment, when a certain data file is received, a direct reference dictionary relating to a simultaneous use file is received, and subsequently, when a simultaneous use file is received, the direct reference dictionary is referred to. Since the simultaneous use file can be received directly without going through the directory, the reception time is shortened. (Embodiment 2) <Outline> Embodiment 2 of the present invention is to shorten the receiving time comprehensively by inserting a reference dictionary directly on the transmission side and directly referring to the reference dictionary on the reception side. In some respects, it is similar to the first embodiment of the present invention.

Embodiment 2 of the present invention is different from Embodiment 1 in that data of a direct reference dictionary is used.
While it is stored in MIB which is a part of DII of DSM-CC-UN,
In the second embodiment, BIOP :: Binding in the indirect reference block
It is stored in the objectInfo of the structure. <Configuration of Transmitting Apparatus> FIG. 19 shows a configuration of the transmitting apparatus according to the second embodiment of the present invention.

The transmitting apparatus 300 shown in FIG. 19 includes an indirect reference block storage section 101, an indirect reference block reading section 10
2. Data block storage unit 103, data block reading unit 104, multiplexing unit 105, data transmission unit 106, antenna 107, direct reference dictionary storage unit 211, direct reference dictionary reading unit 212, and direct reference dictionary insertion unit 311 Prepare.

Here, components having the same functions as those of the components of the conventional transmitting device 100 and the transmitting device 200 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 28, in the BIOP :: Binding structure of the directory object of the DSM-CC, objectInfo that can store auxiliary information of the object is defined. In the second embodiment, the data of the reference dictionary is directly stored in the objectInfo and transmitted.

FIG. 20 is a diagram showing the definition of BIOP :: directDictionary used when data of a reference dictionary is directly stored in objectInfo. The data of the direct reference dictionary shown in FIG. 20 is substantially the same as that shown in FIG. 9 used in the first embodiment. The direct reference dictionary insertion unit 311 inserts the data of the direct reference dictionary into the objectInfo of the BIOP :: Binding structure in the indirect reference block. For example, the data of the direct reference dictionary shown in FIG. 6 is inserted into the objects of FIGS. 4 and 5, and the directory objects of FIGS. 21 and 22 are generated.

<Operation of Transmitting Apparatus> FIG. 23 is a diagram showing a flowchart of processing for transmitting digital data by transmitting apparatus 300 according to Embodiment 2 of the present invention. Here, the operation of transmitting apparatus 300 will be described using FIG. (1) The indirect reference block reading unit 102 reads the indirect reference block from the indirect reference block storage unit 101, the data block reading unit 104 reads the data block from the data block storage unit 103, and the direct reference dictionary reading unit 212 reads the direct reference dictionary storage unit. The reference dictionary is read directly from 211 (step S31). (2) The direct reference dictionary insertion unit 311 converts the data of the direct reference dictionary into the obj of the BIOP :: Binding structure in the indirect reference block.
It is inserted into ectInfo (step S32). (3) The multiplexing unit 105 sorts the indirect reference block into which the data of the direct reference dictionary is inserted and the read data block into several modules, adds a module identification number for each module, and , Each module is divided into DDBs which are transmission units (step S
33). (4) The data transmission unit 106 continues to repeatedly transmit the DDB cyclically (step S34).

When the data file is received, the process of tracing the directory is not necessary as long as the data file is referred to directly. <Structure of Receiving Apparatus> FIG. 24 shows a structure of the receiving apparatus according to the second embodiment of the present invention. The receiving apparatus 350 shown in FIG.
52, data block selecting section 253, data separating section 15
4. Indirect reference block selection unit 155, reference dictionary acquisition unit 3
56, identifier indirect acquisition unit 157, key information selection unit 25
8. Direct reference dictionary restoration section 362, direct reference dictionary storage section 2
63 and an identifier direct acquisition unit 264.

Here, components having the same functions as those of the components of the conventional receiving device 150 and the receiving device 250 of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Here, it is assumed that the receiving device 350 receives digital stream data in which the data block is multiplexed with the indirect reference block into which the data of the direct reference dictionary transmitted from the transmitting device 300 is inserted.

The reference dictionary acquisition unit 356 acquires, from the directory object, the indirect reference dictionary into which the data of the direct reference dictionary has been inserted, and sends the indirect reference dictionary from which the data of the direct reference dictionary has been removed to the identifier indirect acquisition unit 157. The data of the direct reference dictionary is output to the direct reference dictionary restoration unit 362.
The direct reference dictionary restoration unit 362 converts the BI in the indirect reference block.
Obtains the data of the direct reference dictionary inserted in the objectInfo of the OP :: Binding structure and restores the direct reference dictionary.

<Operation of Receiving Apparatus> Here again, a case where the MHEG (ISO / IEC13522-5) program shown in FIG. 2 is received and executed will be described as an example. First, in order to execute the MHEG program shown in FIG. 2, the receiving device 350 reads the file object “display / display” of the file data.

FIG. 25 is a flowchart showing a process in which the receiving device 350 according to the second embodiment of the present invention receives the file object “フ ァ イ ル / display” of file data. The operation at this time will be described below. (1) The identifier direct acquisition unit 264 attempts to search for the reference name “〜 / display” stored in the key list buffer 259 from the direct reference dictionary stored in the direct reference dictionary storage unit 263. However, the direct reference dictionary storage unit 263
At this point, the search fails because the direct reference dictionary is not stored at this time, and the fact is notified to the identifier indirect acquisition unit 157, and the conventional processing is immediately performed (step S).
41). (2) The indirect identifier acquisition unit 157 is the key information selection unit 25
8 based on the key “~” output by the SGW identifier IOR
Is output to the indirect reference block selection unit 155 and the data block selection unit 253 (step S42). (3) The indirect reference block selection unit 155 that has received the SGW identifier IOR outputs the identifier output by the identifier indirect acquisition unit 157 from the indirect reference block output by the data separation unit 154.
A directory object corresponding to the IOR is selected and output to the reference dictionary acquisition unit 356 (step S43). (4) The reference dictionary acquisition unit 356 acquires, from the directory object, the indirect reference dictionary into which the data of the direct reference dictionary has been inserted, and sends the indirect reference dictionary from which the data of the direct reference dictionary has been removed to the identifier indirect acquisition unit 157. The data of the direct reference dictionary is output to the direct reference dictionary restoring unit 362 (step S44). (5) ModuleId1 transmitted from transmitting apparatus 300 as in Embodiment 1 is “SGW”, as shown in FIG.
“~ / Display” and “~ / bitmap.png” are grouped together, and as shown in FIGS. 21 and 22, the objectInfo of the corresponding BIOP :: Binding structure includes “~ / disp”.
lay ”and“ ~ / bitmap.png ”, the direct reference dictionary restoration unit 362
Restores the direct reference dictionary based on the data of the direct reference dictionary output by the reference dictionary acquisition unit 356, and the direct reference dictionary storage unit 263 holds the restored direct reference dictionary (step S45). (6) When the indirect identifier acquisition unit 157 is the key information selection unit 25
Identifier I associated with the key "display" output by 8
OR is selected from the indirect reference dictionary output by the reference dictionary acquisition unit 356, and is output to the indirect reference block selection unit 155 and the data block selection unit 253 (step S46). (7) The data block selection unit 253 determines that the data separation unit 1
The file object “が / display” corresponding to the identifier IOR output by the identifier indirect acquisition unit 157 is selected from the data block output by the terminal 54, and output from the terminal B to the outside (step S47).

Thereafter, the execution of the MHEG program shown in FIG. 2 proceeds, and the file object “~ / bitmap.png” of the bitmap data used for drawing is read. After the receiving device 350 according to the second embodiment of the present invention receives the file object “~ / display” of the file data, the file object “~ / b” of the bitmap data is received.
The operation of the process of receiving itmap.png "is the same as that of the first embodiment described with reference to FIG.

Thereafter, the execution of the MHEG program shown in FIG. 2 proceeds, and the directory object ““ / media ”is received in the same manner as the processing shown in FIG. 25. At this time, the stream object“ 〜 / media ”of the audio stream is received. med
The direct reference dictionary relating to “ia / audio.aif” is restored and held. Then, similarly to the processing shown in FIG.
io.aif ”is received.

As described above, in the second embodiment, when a certain data file is received, a direct reference dictionary relating to a simultaneous use file is received, and subsequently, when a simultaneous use file is received, the direct reference dictionary is referred to. Since the simultaneous use file can be received directly without going through the directory, the reception time is shortened. In Embodiments 1 and 2,
The structure of the direct reference dictionary is a list structure, but may be another structure such as a table structure.

In the first and second embodiments, the key used for searching the dictionary and the object key in the identifier IOR are character strings. However, the key may be another one such as a numerical value. In the first embodiment, the data of the direct reference dictionary is inserted into “directDictionaryInfo” in the DII MIB and transmitted. However, the data may be inserted and transmitted in an independent private section or the like.

In the second embodiment, the data of the direct reference dictionary is inserted into the objectInfo of the BIOP :: Binding structure and transmitted. For example, the BIOP :: Generic Object Message
May be inserted into the objectInfo in the Message SubHeader and transmitted. In addition, although each embodiment has been described as being hardware such as LogicIC, it may be realized by software. Further, the software may be stored in a computer-readable storage medium such as a CD-ROM, as in the case of the device, etc.
It is subject to production, use, transfer, lending, importing, or transfer or lending offer.

[0068]

As is apparent from the above description, the data receiving apparatus according to the present invention receives a directory-structured file system and acquires a data file corresponding to a reference name starting from a predetermined directory name. A data block including a data file and its own identifier, a storage means for storing a direct reference dictionary for directly specifying a data block identifier corresponding to the reference name from the reference name, A reference name obtaining means for obtaining a reference name, and for each directory, an identifier of a data block corresponding to the data file is identified from a name of a data file connected immediately below one directory, and the identifier is connected immediately below the one directory. The indirect reference block corresponding to the two directories Receiving multiplexed data in which a plurality of indirect reference blocks including an indirect reference dictionary for specifying an identifier of a block and its own identifier, a plurality of data blocks, and one or more data of the direct reference dictionary are multiplexed. Means, extracting means for extracting and outputting data of the indirect reference block, data block and direct reference dictionary from the received multiplexed data, and reference obtained by the reference name obtaining means in the direct reference dictionary stored in the storage means. Direct reference means for outputting an identifier of a data block specified directly from the reference name based on the direct reference dictionary when the name is included,
Key information generating means for generating and outputting key information by separating a directory name and a file name of the reference name when the reference name obtained by the reference name obtaining means is not included in the direct reference dictionary stored in the storage means; When the key information output from the key information generating means is a predetermined directory name, an indirect reference means for outputting an identifier of an indirect reference block of the predetermined directory, and an output from the separating means based on the identifier output by the indirect reference means An indirect reference block selecting unit for selecting an indirect reference block corresponding to the key information from the selected indirect reference block; and an indirect reference dictionary extracting unit for extracting an indirect reference dictionary from the selected indirect reference block. The means is an indirect reference dictionary extracted by the indirect reference dictionary extracting means when there is no key information output from the key information generating means. The process of searching for and outputting the identifier corresponding to the key information is repeated until the identifier of the data block is searched, and the data receiving apparatus further includes a separating unit based on the identifiers output by the direct reference unit and the indirect reference unit. Data block selection means for selecting a data block corresponding to the key information from the data blocks output from the data block and extracting a data file from the selected data block; and converting the data of the direct reference dictionary output from the separation means to the data block. It is provided with direct reference dictionary selecting means for selecting data of the corresponding direct reference dictionary, and updating means for storing the data of the selected direct reference dictionary in the storage means.

Thus, when the reference name is included in the direct reference dictionary, the identifier of the data block can be directly specified from the reference name. When the reference name does not exist in the direct reference dictionary, Identifying the data block identifier by tracing the indirect reference dictionary, and acquiring and storing the direct reference dictionary for the data block to be selected later.

Accordingly, when a data block is first selected, a direct reference dictionary for a data block to be selected later is stored. Therefore, when a data block is selected later, a direct reference dictionary is directly obtained from a reference name without tracing an indirect reference dictionary. The identifier of the data block can be specified, and the time required for the reception processing is reduced. Further, in the data receiving apparatus according to the present invention, the receiving means receives the multiplexed data in which the data of the direct reference dictionary corresponding to the data block is multiplexed in the information until the data block is selected. However, the direct reference dictionary selecting means may select data of the direct reference dictionary corresponding to the data block in a process until the data block is selected.

Thus, in the process up to the selection of the first data block, the data of the direct reference dictionary for the subsequent data block can be obtained, so that the processing for obtaining the data of the direct reference dictionary is reduced. I can do it.
Further, in the data receiving apparatus according to the present invention, the data of the direct reference dictionary corresponding to one data block is multiplexed into information in a process until the one data block is selected, and the one data block is multiplexed. The information may be information that directly specifies the identifiers of the two data blocks that are predicted to be continuously selected after the selection of the data block.

Thus, in the process of selecting one data block, it is possible to acquire the data of the direct reference dictionary for the second data block. Further, in the data receiving apparatus according to the present invention, the data of the direct reference dictionary corresponding to one data block includes a module in a stream for transmitting reproduction information used for reproducing a module including the one data block. The direct reference dictionary selecting means selects the data of the direct reference dictionary corresponding to the module from the stream when the stream for transmitting the reproduction information is received. You can also.

Thus, when the stream for transmitting the reproduction information of one data block is received, the data of the direct reference dictionary for the second data block can be obtained. In the data receiving device according to the present invention, the data of the direct reference dictionary corresponding to one data block is:
The one data block is multiplexed in the indirect reference block selected by the indirect reference block selecting means when the one data block is selected, and the direct reference dictionary selecting means includes an indirect reference block selected by the indirect reference block selecting means. Alternatively, the data of the reference dictionary can be directly selected from.

Thus, when an indirect reference block is selected to select one data block, data of a direct reference dictionary for the second data block can be obtained. As is apparent from the above description, the data transmission device according to the present invention is a data transmission device for transmitting a file system having a directory structure, and the name of a data file connected immediately under the one directory for each directory. And an indirect reference dictionary that identifies the identifier of the data block corresponding to the data file and identifies the identifier of the indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory A plurality of data blocks including an indirect reference block including a data identifier, a plurality of data blocks including a data file and its own identifier, and an identifier for directly specifying a data block identifier corresponding to the reference name from a reference name starting from a predetermined directory name Acquisition means for acquiring the above-mentioned direct reference dictionary, and A multiplexing unit that multiplexes the reference block, the obtained data block, and the obtained data of the direct reference dictionary to generate multiplexed data, and a transmission unit that transmits the multiplexed data. .

As a result, the multiplexed data in which the reference dictionary is multiplexed is transmitted directly, so that the data receiving apparatus that receives the multiplexed data can directly identify the identifier of the data block from the reference name. Therefore, the time required for the transmission / reception processing is reduced. Further, in the data transmission device according to the present invention, the direct reference dictionary is, from the reference names of a plurality of data files predicted to be acquired simultaneously and continuously, directly from the data blocks corresponding to the respective reference names. It may be characterized in that it is information for specifying an identifier.

Thus, in the data receiving device, the identifier of each corresponding data block can be directly specified from the reference names of a plurality of data files which are predicted to be obtained simultaneously and continuously. If the reference dictionary is obtained, it is possible to specify the identifiers of all data blocks that are predicted to be obtained simultaneously and continuously.

Further, in the data transmitting apparatus according to the present invention, the multiplexing means may include, for all of the reference names in the direct reference dictionary, the direct name in information used for specifying a data block indicated by the reference name. It may be characterized in that the data of the reference dictionary is multiplexed. With this, in the data receiving apparatus, in the process of selecting the first data block, the data of the direct reference dictionary for the subsequent data block can be obtained. Less is needed.

In the data transmitting apparatus according to the present invention, the multiplexing means multiplexes the data of the direct reference dictionary into a stream used to specify a module indicated by the identifier in the direct reference dictionary. It can also be characterized. Thereby, in the data receiving apparatus, since the data of the direct reference dictionary for the subsequent data block can be obtained from the stream reproduced in the process of selecting the first data block, the data of the direct reference dictionary is obtained. Less processing is required.

Further, in the data transmitting apparatus according to the present invention, the multiplexing means may include, for all of the reference names in the direct reference dictionary, in the indirect reference block used for specifying the data block indicated by the reference name. The data of the direct reference dictionary may be multiplexed. Thereby, in the data receiving device, since the data of the direct reference dictionary for the subsequent data block can be obtained from the indirect reference block obtained in the process of selecting the first data block, the data of the direct reference dictionary can be obtained. The process for acquiring is small.

As is clear from the above description, the data receiving method according to the present invention stores a direct reference dictionary that specifies an identifier of a data block corresponding to a reference name directly from a reference name starting from a predetermined directory name. A data receiving method comprising: receiving a directory-structured file system and acquiring a data file corresponding to the reference name, wherein the data block includes the data file and its own identifier. A reference name obtaining step of obtaining a reference name of a data file to be obtained, and specifying, for each directory, an identifier of a data block corresponding to the data file from the name of a data file connected immediately below the one directory, and specifying the one directory. From the name of the second directory connected directly under A plurality of indirect reference blocks including an indirect reference dictionary for specifying an identifier of an indirect reference block corresponding to the directory and its own identifier, a plurality of data blocks, and one or more data of the direct reference dictionary are multiplexed. A receiving step of receiving the multiplexed data, a separating step of extracting and outputting the indirect reference block, the data block, and the data of the direct reference dictionary from the received multiplexed data, and referring to the direct reference dictionary stored in the storage means A direct reference step of outputting an identifier of a data block directly specified from the reference name based on the direct reference dictionary when the reference name obtained in the name obtaining step is included, and a direct reference dictionary stored in the storage unit If the reference name obtained in the reference name obtaining step is not included in the A key information generating step of generating and outputting key information by releasing, and an indirect reference step of outputting an identifier of an indirect reference block of a predetermined directory when the key information output in the key information generating step is a predetermined directory name; An indirect reference block selecting step of selecting an indirect reference block corresponding to the key information from the indirect reference block output in the separation step based on the identifier output in the indirect reference step,
An indirect reference dictionary extraction step of extracting an indirect reference dictionary from the selected indirect reference block. In the indirect reference step, if the key information output in the key information generation step is not a predetermined directory name, the indirect reference dictionary extraction The process of searching for and outputting the identifier corresponding to the key information from the indirect reference dictionary extracted in the step is repeated until the identifier of the data block is searched, and the data receiving method further comprises the direct reference step and the indirect reference step. Selecting a data block corresponding to the key information from the data blocks output in the separation step based on the identifier to be extracted, and extracting a data file from the selected data block; and a direct reference dictionary output in the separation step Corresponding to the data block from the data A direct reference dictionary selection step of selecting the data of the direct reference dictionary that, characterized in that it comprises an update step of storing the data of the direct reference dictionary selected in the storage means.

Thus, if the reference name is included in the direct reference dictionary, the identifier of the data block can be directly specified from the reference name. If the reference name is not included in the direct reference dictionary, Identifying the data block identifier by tracing the indirect reference dictionary, and acquiring and storing the direct reference dictionary for the data block to be selected later.

Therefore, when a data block is first selected, a direct reference dictionary for a data block to be selected later is stored. Therefore, when a data block is selected later, a direct reference dictionary is directly obtained from a reference name without tracing an indirect reference dictionary. The identifier of the data block can be specified, and the time required for the reception processing is reduced. As is clear from the above description, the data transmission method according to the present invention is a data transmission method for transmitting a file system having a directory structure, and the name of a data file connected immediately under the one directory for each directory. And an indirect reference dictionary that identifies the identifier of the data block corresponding to the data file and identifies the identifier of the indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory A plurality of data blocks including an indirect reference block including a data identifier, a plurality of data blocks including a data file and its own identifier, and an identifier for directly specifying a data block identifier corresponding to the reference name from a reference name starting from a predetermined directory name An acquisition step of acquiring the above direct reference dictionary, and A multiplexing step of multiplexing the indirect reference block, the acquired data block, and the acquired data of the direct reference dictionary to generate multiplexed data, and a transmission step of transmitting the multiplexed data. I do.

Thus, since the multiplexed data in which the reference dictionary is multiplexed is transmitted directly, the data receiving apparatus that receives the multiplexed data can directly identify the identifier of the data block from the reference name. Therefore, the time required for the transmission / reception processing is reduced.

As is apparent from the above description, the computer-readable storage medium on which the data receiving program according to the present invention is recorded can be obtained by directly referring to the identifier of the data block corresponding to the reference name starting from the reference name starting from the predetermined directory name. In a data receiving apparatus comprising a storage means for storing a direct reference dictionary for specifying a file, a computer-readable storage for storing a data receiving program for receiving a file system having a directory structure and obtaining a data file corresponding to the reference name A medium, wherein the data block comprises a data file and its own identifier;
A reference name obtaining step for obtaining a reference name of the data file to be obtained by the computer, and for each directory, an identifier of a data block corresponding to the data file is identified from a name of the data file connected immediately under the one directory A plurality of indirect reference blocks including a plurality of indirect reference blocks including an indirect reference dictionary for identifying an identifier of an indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory and its own identifier. A receiving step of receiving multiplexed data in which a data block and one or more data of the direct reference dictionary are multiplexed; and converting an indirect reference block, a data block, and data of the direct reference dictionary from the received multiplexed data. Separation step for extracting and outputting, and referencing the direct reference dictionary stored in the storage means A direct reference step of outputting an identifier of a data block directly specified from the reference name based on the direct reference dictionary when the reference name obtained in the name obtaining step is included, and a direct reference dictionary stored in the storage unit If the reference name obtained in the reference name obtaining step is not included, the key information generation step of generating and outputting key information by separating the directory name and the file name of the reference name and the key information generation step If the key information is a predetermined directory name, an indirect reference step of outputting an identifier of an indirect reference block of a predetermined directory; and the key from the indirect reference block output in the separation step based on the identifier output in the indirect reference step. An indirect reference block selecting step of selecting an indirect reference block corresponding to the information; Performing an indirect reference dictionary extraction step of extracting an indirect reference dictionary from the reference block. In the indirect reference step, if the key information output in the key information generation step is not a predetermined directory name, the key information is extracted in the indirect reference dictionary extraction step. The process of searching for and outputting the identifier corresponding to the key information from the indirect reference dictionary obtained is repeated until the identifier of the data block is searched, and further separated into the computer based on the identifier output in the direct reference step and the indirect reference step. Selecting a data block corresponding to the key information from the data blocks output in the step, and extracting a data file from the selected data block; and selecting the data block from the data of the direct reference dictionary output in the separation step. Direct reference term corresponding to A data receiving program for executing a direct reference dictionary selecting step of selecting book data and an updating step of storing the selected direct reference dictionary data in the storage means is recorded.

Thus, the same effect as in the data receiving method can be obtained. As is apparent from the above description, the computer readable storage medium storing the data transmission program according to the present invention is a computer readable storage medium storing the data transmission program for transmitting a file system having a directory structure. Then, the computer specifies the identifier of the data block corresponding to the data file from the name of the data file connected immediately under the one directory for each directory, and the two directories connected immediately under the one directory. A plurality of indirect reference blocks including an indirect reference dictionary that specifies an identifier of an indirect reference block corresponding to the two directories from the name of the two directories and a plurality of data blocks including a data file and its own identifier; Reference starting with the directory name An acquisition step of acquiring the one or more direct reference dictionary to identify the identifier of the direct data block corresponding to the reference name from the name,
A multiplexing step of multiplexing the obtained indirect reference block, the obtained data block, and the obtained data of the direct reference dictionary to generate multiplexed data, and a transmitting step of transmitting the multiplexed data are executed. A data transmission program for recording the data.

[0086] Thereby, the same effect as in the data transmission method can be obtained. As is apparent from the above description, the computer-readable storage medium storing transmission / reception data according to the present invention is a computer-readable storage medium storing transmission / reception data for transmitting / receiving a file system having a directory structure. For each directory, the identifier of the data block corresponding to the data file is specified from the name of the data file connected immediately below the one directory, and the identifier of the two directories connected immediately below the one directory is specified. A plurality of indirect reference blocks including an indirect reference dictionary that specifies the identifier of the indirect reference block corresponding to the directory and the own identifier, a plurality of data blocks including the data file and the own identifier, and a predetermined directory name. A reference name that starts with a reference name And one or more direct reference dictionary data is information specifying the identifier of the data block to be to record received data, characterized by being multiplexed.

As described above, since the reference dictionary is multiplexed directly with the transmitted / received data, the data receiving apparatus that receives the transmitted / received data can directly specify the identifier of the data block from the reference name. Therefore, the time required for the transmission / reception processing is reduced. Further, in a computer-readable storage medium recording transmission / reception data according to the present invention, the data of the direct reference dictionary is multiplexed into information used to specify one data block, and the one data block is multiplexed. The information may be information that directly specifies the identifiers of the two data blocks from the reference names of the two data blocks that are predicted to be continuously selected after the selection.

As described above, since the data of the direct reference dictionary is multiplexed in the information used to specify one data block, in the data receiving apparatus that receives the transmitted / received data, one data block is received. In the process of selecting, the data of the direct reference dictionary for the second data block can be acquired, and the processing for acquiring the data of the direct reference dictionary can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a transmitting apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a MHEG (ISO / IEC13522-5) program.

FIG. 3 shows three data files "~ / display", "~" used simultaneously or successively in the MHEG program shown in FIG.
/bitmap.png ”,“ ~ / media / audio.aif ”and SGW (Servic
3 is a diagram showing a directory structure of a directory object “~ / media”.

FIG. 4 is a diagram showing the contents of each object.

FIG. 5 is a diagram showing the contents of each object.

FIG. 6 is a diagram illustrating a direct reference dictionary stored in a direct reference dictionary storage unit 211;

FIG. 7 is a diagram showing a definition of BIOP :: ModuleInfo.

FIG. 8 is a diagram illustrating an example of a BIOP :: ModuleInfo transmission format.

FIG. 9 is a diagram showing a format “directDictionaryInfo” when the contents of a direct reference dictionary are stored in userInfo.

FIG. 10 shows an example of a BIOP :: ModuleInfo transmission format in which “directDictionaryInfo” shown in FIG. 9 is inserted.

FIG. 11 is a diagram showing DII generated based on the direct reference dictionary shown in FIG. 6 by the processing of the present embodiment.

FIG. 12 is a diagram showing DII generated based on the direct reference dictionary shown in FIG. 6 by the processing of the present embodiment.

FIG. 13 is a diagram showing a DII generated based on the direct reference dictionary shown in FIG. 6 by the processing of the present embodiment.

FIG. 14 is a diagram illustrating a transmission apparatus 200 according to Embodiment 1 of the present invention.
Is a diagram showing a flowchart of a process for transmitting digital data. FIG.

FIG. 15 is a diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.

FIG. 16 shows ModuleId1 and Modu transmitted by transmitting apparatus 200.
It is a figure showing the inside of leId2.

FIG. 17 is a diagram illustrating a configuration of the receiving apparatus 250 according to the first embodiment of the present invention.
File object "~ / display" of file data
FIG. 7 is a diagram showing a flowchart of a process of receiving a request.

FIG. 18 is a diagram illustrating a receiving apparatus 250 according to the first embodiment of the present invention.
File object "~ / display" of file data
FIG. 9 is a diagram showing a flowchart of a process of receiving a file object “~ / bitmap.png” of bitmap data after receiving the file object.

FIG. 19 is a diagram illustrating a configuration of a transmitting apparatus according to Embodiment 2 of the present invention.

FIG. 20 is a diagram illustrating the definition of BIOP :: directDictionary used when data of a reference dictionary is directly stored in objectInfo.

FIG. 21 is a diagram showing a directory object generated by inserting data of the direct reference dictionary shown in FIG. 6;

FIG. 22 is a diagram showing a directory object generated by inserting data of the direct reference dictionary shown in FIG. 6;

FIG. 23 shows transmitting apparatus 300 according to Embodiment 2 of the present invention.
Is a diagram showing a flowchart of a process for transmitting digital data. FIG.

FIG. 24 is a diagram illustrating a configuration of a receiving apparatus according to Embodiment 2 of the present invention.

FIG. 25 is a diagram illustrating a receiving apparatus 350 according to the second embodiment of the present invention.
File object of file data "~ / display"
FIG. 7 is a diagram showing a flowchart of a process of receiving a request.

FIG. 26 is a schematic diagram of a data transmission / reception system.

FIG. 27 is a diagram showing a module composed of a plurality of BIOP messages.

FIG. 28 is a diagram showing a definition of a directory object.

FIG. 29 is a diagram showing a definition of a file object.

FIG. 30 is a diagram showing a definition of IOP :: IOR.

FIG. 31 shows an identifier in the object carousel method.
FIG. 4 is a diagram illustrating a definition of BIOP :: ObjectLocation, which is a main element of an IOR.

FIG. 32 is a diagram schematically illustrating a conventional method of referring to a file message from a file name (key list) in the object carousel method.

FIG. 33 is a diagram showing a configuration of a conventional transmission device that transmits a file having a directory structure by an object carousel method.

FIG. 34 is a diagram illustrating a configuration of a conventional receiving apparatus that receives a file having a directory structure by an object carousel method.

FIG. 35 is a diagram illustrating an example in which simultaneous use files are transmitted by the same module.

[Explanation of symbols]

 101 indirect reference block storage unit 102 indirect reference block reading unit 103 data block storage unit 104 data block reading unit 105 multiplexing unit 106 data transmission unit 107 antenna 151 reception antenna 152 data reception unit 152 reception unit 155 indirect reference block selection unit 155 selection Unit 156 reference dictionary acquisition unit 157 identifier indirect acquisition unit 200 transmitting device 205 multiplexing unit 211 direct reference dictionary storage unit 212 direct reference dictionary reading unit 213 direct reference block generation unit 250 reception device 253 data block selection unit 254 data separation unit 257 identifier Indirect acquisition unit 258 Key information selection unit 259 Key list buffer 261 Selection unit 261 Direct reference block selection unit 262 Direct reference dictionary restoration unit 263 Direct reference dictionary storage unit 264 Identifier direct acquisition unit 30 Transmitting device 311 direct reference dictionary insertion portion 350 receiving apparatus 356 reference dictionary acquisition unit 362 direct reference dictionary restorer

Claims (16)

[Claims] 1. A data receiving apparatus for receiving a file system having a directory structure and obtaining a data file corresponding to a reference name starting from a predetermined directory name, wherein the data block includes the data file and its own identifier. A storage means for storing a direct reference dictionary for specifying an identifier of a data block corresponding to the reference name directly from the reference name; a reference name obtaining means for obtaining a reference name of a data file to be obtained; Identify the identifier of the data block corresponding to the data file from the name of the data file connected directly under one directory, and correspond to the two directories from the name of the two directories connected directly under the one directory Indirect reference dictionary that specifies the identifier of the indirect reference block to be Receiving means for receiving multiplexed data obtained by multiplexing a plurality of indirect reference blocks including: a plurality of data blocks; and data of one or more of the direct reference dictionaries; When the separation unit that extracts and outputs the indirect reference block, the data block, and the data of the direct reference dictionary, and the direct reference dictionary stored in the storage unit includes the reference name obtained by the reference name obtaining unit. The direct reference means for outputting the identifier of the data block specified directly from the reference name based on the direct reference dictionary, and the direct reference dictionary stored in the storage means include the reference name obtained by the reference name obtaining means. If not, the key information is generated by separating the directory name and file name of the reference name, and the key information is output from the key information generating means. If the information is a predetermined directory name, the indirect reference means for outputting the identifier of the indirect reference block of the predetermined directory, and the indirect reference block output from the separating means based on the identifier output by the indirect reference means, An indirect reference block selecting unit that selects an indirect reference block corresponding to the key information; and an indirect reference dictionary extracting unit that extracts an indirect reference dictionary from the selected indirect reference block. If the key information output from the generation unit is not a predetermined directory name, the process of searching for and outputting an identifier corresponding to the key information from the indirect reference dictionary extracted by the indirect reference dictionary extraction unit is performed by using the data block identifier. The data receiving apparatus further outputs the direct reference means and the indirect reference means A data block corresponding to the key information selected from the data blocks output from the separation unit based on the identifier, and a data block selection unit for extracting a data file from the selected data block; and a direct data block output from the separation unit. Direct reference dictionary selecting means for selecting data of the direct reference dictionary corresponding to the data block from the data of the reference dictionary, and updating means for storing the data of the selected direct reference dictionary in the storage means. Data receiving device. 2. The receiving means receives multiplexed data in which data of a direct reference dictionary corresponding to the data block is multiplexed in information in a process until the data block is selected, and The reference dictionary selecting means, in a process until the data block is selected,
2. The data receiving apparatus according to claim 1, wherein data of a direct reference dictionary corresponding to the data block is selected. 3. The data of the direct reference dictionary corresponding to one data block is multiplexed into information in a process until the one data block is selected, and continuously after the one data block is selected. 3. The data receiving apparatus according to claim 2, wherein the information is information that directly specifies an identifier of the two data blocks predicted to be selected. 4. The data of the direct reference dictionary corresponding to one data block is multiplexed for each module in a stream for transmitting reproduction information used for reproducing a module including the one data block. The direct reference dictionary selecting means, when receiving a stream for transmitting the reproduction information, selects data of a direct reference dictionary corresponding to the module from the stream. 3. The data receiving device according to claim 1. 5. The direct reference dictionary data corresponding to one data block is multiplexed in the indirect reference block selected by the indirect reference block selecting means when the one data block is selected, 4. The data receiving apparatus according to claim 3, wherein the direct reference dictionary selection unit selects data of the direct reference dictionary from the indirect reference blocks selected by the indirect reference block selection unit. 6. A data transmitting apparatus for transmitting a file system having a directory structure, wherein for each directory, an identifier of a data block corresponding to the data file is identified from a name of a data file connected immediately below the one directory. A plurality of indirect reference blocks including an indirect reference dictionary that specifies and identifies an identifier of an indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory, and its own identifier And a plurality of data blocks including a data file and its own identifier, and one or more direct reference dictionaries that directly specify the identifier of the data block corresponding to the reference name from a reference name starting from a predetermined directory name Acquisition means, the acquired indirect reference block, and the acquired data block. Click a data transmission device, characterized in that it comprises a multiplexing means for generating a multiplexed data by multiplexing the data of the acquired direct reference dictionary, and transmitting means for transmitting the multiplexed data. 7. The direct reference dictionary includes information for directly specifying an identifier of a data block corresponding to each reference name from each reference name of a plurality of data files predicted to be acquired simultaneously and continuously. The data transmission device according to claim 6, wherein: 8. The multiplexing means, for all of the reference names in the direct reference dictionary, multiplexes the data of the direct reference dictionary in information used to specify a data block indicated by the reference name. The data transmitting apparatus according to claim 7, wherein the data transmitting apparatus is used. 9. The method according to claim 8, wherein the multiplexing unit multiplexes the data of the direct reference dictionary into a stream used to specify a module indicated by the identifier in the direct reference dictionary. A data transmission device according to claim 1. 10. The multiplexing unit, for all of the reference names in the direct reference dictionary, stores the data of the direct reference dictionary in an indirect reference block used to specify a data block indicated by the reference name. 9. The data transmission device according to claim 8, wherein each of the data transmission devices is multiplexed. 11. A data receiving apparatus comprising storage means for storing a direct reference dictionary for specifying an identifier of a data block corresponding to a reference name directly from a reference name starting from a predetermined directory name, wherein the file system having a directory structure is A data receiving method for receiving and obtaining a data file corresponding to the reference name, wherein the data block includes a data file and its own identifier, and obtains a reference name of the data file to be obtained. And, for each directory, identify the identifier of the data block corresponding to the data file from the name of the data file connected directly under the one directory, and the name of the two directories connected directly under the one directory From the indirect reference block corresponding to the two directories Receives multiplexed data obtained by multiplexing an indirect reference dictionary specifying an identifier, a plurality of indirect reference blocks including its own identifier, a plurality of data blocks, and data of one or more of the direct reference dictionaries. A separating step of extracting and outputting an indirect reference block, a data block, and data of a direct reference dictionary from the received multiplexed data; and outputting a reference name to the direct reference dictionary stored in the storage means. When the reference name obtained in the obtaining step is included, a direct reference step of outputting an identifier of a data block specified directly from the reference name based on the direct reference dictionary; and a direct reference dictionary stored in the storage unit. If the reference name obtained in the reference name obtaining step is not included, the key information is generated by separating the directory name and file name of the reference name. In the key information generating step to be output, and when the key information output in the key information generating step is a predetermined directory name, the key information is output in an indirect reference step of outputting an identifier of an indirect reference block of the predetermined directory, and An indirect reference block selecting step of selecting an indirect reference block corresponding to the key information from the indirect reference blocks output in the separation step based on the identifier; and an indirect extracting an indirect reference dictionary from the selected indirect reference block A reference dictionary extraction step, wherein in the indirect reference step, if the key information output in the key information generation step is not a predetermined directory name, the key information is extracted from the indirect reference dictionary extracted in the indirect reference dictionary extraction step. The process of searching for and outputting the corresponding identifier is performed in a data block. The data receiving method further comprises: based on the identifiers output in the direct reference step and the indirect reference step, from the data blocks output in the separation step, the data blocks corresponding to the key information. From the data block selection step of selecting and extracting the data file from the selected data block, and the data of the direct reference dictionary output in the separation step,
A data receiving method, comprising: a direct reference dictionary selecting step of selecting data of a direct reference dictionary corresponding to the data block; and an updating step of storing the selected data of the direct reference dictionary in a storage unit. 12. A data transmission method for transmitting a file system having a directory structure, comprising, for each directory, an identifier of a data block corresponding to the data file from a name of a data file connected immediately under the one directory. A plurality of indirect reference blocks including an indirect reference dictionary that specifies and identifies an identifier of an indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory, and its own identifier And a plurality of data blocks including a data file and its own identifier, and one or more direct reference dictionaries that directly specify the identifier of the data block corresponding to the reference name from a reference name starting from a predetermined directory name Acquisition step, acquired indirect reference block, and acquired data And data blocks, a multiplexing step of generating multiplexed data by multiplexing the data of the acquired direct reference dictionary, the data receiving method characterized by comprising a transmission step of transmitting the multiplexed data. 13. A data receiving apparatus comprising: storage means for storing a direct reference dictionary for specifying an identifier of a data block corresponding to a reference name directly from a reference name starting from a predetermined directory name. A computer readable storage medium for receiving and recording a data receiving program for acquiring a data file corresponding to the reference name, wherein the data block includes a data file and an identifier of the data block, A reference name obtaining step of obtaining a reference name of a data file to be obtained, and for each directory, an identifier of a data block corresponding to the data file is specified from a name of a data file connected immediately under the one directory, and Two connected directly under one directory An indirect reference dictionary that specifies an identifier of an indirect reference block corresponding to the two directories from a directory name; a plurality of indirect reference blocks including its own identifier; a plurality of data blocks; and one or more of the direct references A receiving step of receiving multiplexed data obtained by multiplexing dictionary data; a separating step of extracting and outputting indirect reference blocks, data blocks, and data of a direct reference dictionary from the received multiplexed data If the direct reference dictionary stored in the storage means includes the reference name obtained in the reference name obtaining step, the identifier of the data block directly specified from the reference name is output based on the direct reference dictionary. If the reference name obtained in the reference name obtaining step is not included in the direct reference step Key information is generated by separating the directory name and file name of the reference name, and the key information generation step of outputting the key information is performed. If the key information output in the key information generation step is a predetermined directory name, An indirect reference step of outputting an identifier of an indirect reference block of the directory of the directory, and an indirect reference block corresponding to the key information is selected from the indirect reference blocks output in the separation step based on the identifier output in the indirect reference step Executing an indirect reference block selecting step and an indirect reference dictionary extracting step of extracting an indirect reference dictionary from the selected indirect reference block, wherein the key information output in the key information generating step is a predetermined If it is not a directory name, the indirect reference extracted in the indirect reference dictionary extraction step The process of retrieving and outputting the identifier corresponding to the key information from the document is repeated until the identifier of the data block is retrieved, and further separated to the computer based on the identifier output in the direct reference step and the indirect reference step. From the data blocks output in the step, a data block corresponding to the key information is selected, a data block selection step of extracting a data file from the selected data block, and from the data of the direct reference dictionary output in the separation step,
A data receiving program for executing a direct reference dictionary selecting step of selecting data of the direct reference dictionary corresponding to the data block and an updating step of storing the selected data of the direct reference dictionary in the storage unit are recorded. Computer readable storage medium. 14. A computer-readable storage medium having recorded thereon a data transmission program for transmitting a file system having a directory structure, wherein the computer stores, for each directory, a data file connected immediately under the one directory. Indirect reference that identifies the identifier of the data block corresponding to the data file from the name of the directory, and identifies the identifier of the indirect reference block that corresponds to the two directories from the name of the two directories connected immediately below the one directory A dictionary, a plurality of indirect reference blocks including its own identifier, a plurality of data blocks including a data file and its own identifier, and a data block corresponding to the reference name directly from a reference name starting from a predetermined directory name. One or more direct references that identify the identifier And a multiplexing step of multiplexing the obtained indirect reference block, the obtained data block, and the obtained data of the direct reference dictionary to generate multiplexed data, A computer-readable storage medium storing a data transmission program for executing a transmission step of transmitting data. 15. A computer-readable storage medium for recording transmission / reception data for transmitting / receiving a file system having a directory structure, wherein, for each directory, a name of a data file connected immediately under the one directory is used to determine the name of the data file. An indirect reference dictionary that identifies the identifier of the data block corresponding to the data file, identifies the identifier of the indirect reference block corresponding to the two directories from the name of the two directories connected immediately below the one directory, and A plurality of indirect reference blocks including an identifier of a data file, a plurality of data blocks including a data file and its own identifier, and an identifier of a data block corresponding to the reference name directly from a reference name starting from a predetermined directory name Information of one or more direct reference dictionaries A computer-readable storage medium recording transmission / reception data, wherein the transmission / reception data is multiplexed. 16. The data of the direct reference dictionary is multiplexed into information used to specify one data block, and is predicted to be continuously selected after the selection of the one data block. 16. The computer-readable storage medium according to claim 15, wherein the information is information for directly specifying an identifier of the data block from the reference name of the data block.