JP2003078494A - Data transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for data transfer which can receive raw material data by effectively utilizing the data base of a local station and transfer them to a slave station. SOLUTION: The data transfer device, which receives a data stream including a plurality of kinds of repeatedly sent repeat data from a host station and transfers the repeat data to a slave station, has a storage area for storing the plurality of kinds of repeat data, extracts the respective kinds of repeat data from the data stream received from the host station and stores the respective extracted pieces of repeat data in the storage area, determines the constitution ratio of the kinds of repeat data to be outputted in every fixed time, and reads the plurality of kinds of repeat data stored in the storage means and outputs them at the determined constitution ratio.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer device for receiving material data for data broadcasting repeatedly transmitted in digital broadcasting and controlling transfer of the received material data.

[0002]

2. Description of the Related Art In recent years, in digital broadcasting, in addition to video data and audio data forming a broadcast program, material data forming a data broadcast program such as an electronic program guide, weather forecast, news, etc. are multiplexed and broadcast. There is. The transmission method of these material data differs from that of video data and audio data, and DSM-CC (Digital Storage Media Comman
d and Control) It is transmitted by a transmission method called a carousel transmission method.

Here, the "DSM-CC carousel transmission system" is an international standard ISO / IEC13818-.
6 "Part6: Extensions for Digital Storage Med
ia Command and Control "is a transmission method defined by" ia Command and Control "and refers to a transmission method in which data of the same content is transmitted repeatedly and repeatedly. By providing the data broadcast program of the same content, the viewer can take out the material data and view the data broadcast program when necessary.

For digital broadcasting, B using a broadcasting satellite is used.
There are S (Broadcasting Satellite) digital broadcasting and terrestrial digital broadcasting using terrestrial waves. In terrestrial digital broadcasting, various multiplexed data is transmitted from a central television station (hereinafter referred to as “key station”), which is the source of data, to a local television station (hereinafter referred to as “local station”), which is an affiliated station. Various types of data are transmitted to local stations using a dedicated line.

As a result, the local station can provide the data broadcast program digitally broadcast by the key station to the viewer in real time.

[0006]

However, the data band that can be used for transmitting material data generally differs between the key station and the local station, and the data band that the key station can use is the data band that the local station can use. If it is smaller than the band, if the material data input from the key station is output as is at the bit rate at the time of input, part of the data band of the local station will not be used for output of the material data, which is a waste. Occurs. Further, if the data band that the local station can use is smaller than the data band that the key station can use, the material data input from the key station cannot be output as it is at the bit rate at the time of input.

In view of the above problems, the present invention provides a data transfer device and a data transfer method capable of effectively utilizing the data band of a local station to receive material data and transfer the material data to a lower station. With the goal.

[0008]

In order to solve the above problems, the present invention provides a data transfer for receiving a data stream including a plurality of types of repeat data repeatedly transmitted from an upper station and transferring the repeat data to a lower station. The device is a storage unit having a storage area for storing multiple types of repeat data, an extraction unit for extracting each type of repeat data from a data stream received from a higher station, and each extracted repeat data. Storing means for storing in the storage area, data composition ratio determining means for determining a composition ratio between types of repeat data to be output per fixed time, and each of the plurality of types of repeat data stored in the storage means And a data output means for outputting at the determined component ratio.

Here, the "subordinate station" is an external relay station,
Refers to a receiving device. Here, "transfer" means processing the received data and transmitting it via broadcasting or a line. Further, “processing” refers to changing the sending speed or the composition ratio of the received data.

Here, the "repeat data" refers to a carousel, a module or the like that constitutes material data. Also, "Carousel" means DSM-CC from the broadcasting station.
(Digital Storage Media Command and Control) A unit of data that is repeatedly transmitted by the carousel transmission method.

The "module" is a minimum data unit that is meaningful as information, and is a data unit that constitutes a carousel. Further, each of the repeat data may be composed of a plurality of packet data transmitted by a carousel transmission method, and the data stream may be a transport stream.

Further, according to the present invention, a storage area for receiving a data stream including a plurality of types of repeat data repeatedly transmitted from an upper station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A data transfer method in a data transfer device comprising: an extracting step of extracting each type of repeat data from a data stream received from a higher station; a storing step of storing each extracted repeat data in the storage area, A data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time, and reading each of the plurality of types of repeat data stored in the storage means, and outputting at the determined composition ratio. The data output step may be included.

Further, according to the present invention, a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from a higher station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A computer-readable recording medium for recording a program used in a data transfer device having: a program for extracting repeat data of each type from a data stream received from a higher station; A storage step of storing data in the storage area; a data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time; and each of the plurality of types stored in the storage means. A data output step for reading the repeat data and outputting it at the determined composition ratio. May be included.

Further, according to the present invention, a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from a higher station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A program used in a data transfer device having, an extracting step of extracting each type of repeat data from a data stream received from a higher station, a storing step of storing each extracted repeat data in the storage area, A data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time, and reading each of the plurality of types of repeat data stored in the storage means, and outputting at the determined composition ratio. The data output step may be included.

With this configuration, even when the data band that the local station can use is larger than the data band that the key station can use, each stored repeat data is read a necessary number of times according to the band difference, and the repeat data is read. Since it is possible to adjust the rate at which data is repeatedly transferred, it is possible to transfer each repeat data at a predetermined composition ratio with good transmission efficiency by making the best use of the available data band.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION <Structure> Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration of a main part of a data transfer device 100 according to an embodiment of the present invention. The data transfer device 100 includes a data storage unit 101, a data extraction unit 102, and an extracted data counting unit 1
03, data composition ratio determination unit 104, data output unit 10
5 and a data output rate storage unit 106.

The data transfer apparatus 100 is composed of a CPU, a ROM, a RAM, a hard disk, a decoder, a filter and the like as hardware, and a computer program is stored in the ROM or the hard disk, and the CPU follows the computer program. By operating, the device achieves its function. Hereinafter, the data transfer device 200 and the data transfer device 3 described later
00, data transfer device 400, data transfer device 500,
The same applies to the data transfer device 600.

The data storage unit 101 is composed of a RAM, a hard disk, etc., and stores the material data extracted by the data extraction unit 102. Specifically, the material data is stored in the allocated storage area (hereinafter, referred to as “allocated storage area”) for each module forming the material data. The module will be described later. Figure 2
Broadcasting Station to DSM-CC (Digital Storage Media Comm
and and Control) is a diagram showing the format of material data transmitted by the carousel transmission method. The material data is transmitted in packet data units 200 to 209 shown in FIG. The packet data consists of a fixed length packet of 188 bytes for each packet data, and each packet data is composed of PID and mod included in the packet data.
It is identified by an identifier called ule ID or block Number and the order of transmission.

Here, "PID" refers to an identifier for distinguishing the type of packet data and carousel, and is used as an identifier for identifying each carousel and video data that compose material data, for example. It "Mo
“Dule ID” refers to an identifier for identifying each module that constitutes the carousel.

The "block Number" is an identifier for identifying each section that constitutes a module. A "section" is a data unit that constitutes a module. Next, the relationship between packet data, section, module, carousel, and material data will be described. FIG. 3 is a diagram showing the above relationship.

As shown in FIG. 3A, the material data is composed of a plurality of carousels 450 and 451. As shown in FIG. 3B, the carousel is composed of a plurality of modules 350 and 351. As shown in FIG. 3C, the module has a plurality of sections 300 to 345.
3D, and the section is composed of a plurality of packet data 250 to 273, as shown in FIG.

The pnum in parentheses in FIG. 3 (d) is a number given for convenience of explanation, and indicates the number of packet data of the section to which the packet data belongs. Actually, the pnum is not added to the packet data, and the position in the section of the packet data to be transmitted identifies the number of packet data.

2 and 3, a module ID and a block number are given to each packet data (at this point, it does not conform to the MPEG2 standard), but it conforms to the MPEG2 standard. Module ID and block Num only in the first packet data in each section
ber may be given. In this case, module I of each packet data excluding the head of each section
The D and block numbers can be specified based on the order in which the packet data is transmitted.

FIG. 4 is a diagram schematically showing an example of the data structure of the material data stored in the data storage unit 101. As shown in Figure 4, the material data is PID, module I
It is stored for each D and block number. Specifically, each packet data (hereinafter, referred to as “material packet data”) forming the material data is classified by PID, and the material packet data having the same PID is classified by module ID. The material packet data having the same module ID is classified and stored for each block number.

For example, each material packet data having a PID of 100 has modules 410 to 410 based on its module ID.
The material packet data classified into 440 and further classified into each module is classified and stored in a section (for example, in the module 410, sections 420 to 430) configuring the module based on the block number. And in each classified section,
Material packet data belonging to the section is stored. Specifically, the section 420 stores material packet data 421 to 424, and the section 430 stores material packet data 431 to 434.

The data extraction unit 102 is composed of a transport stream decoder or the like, and includes a transport stream including material data transmitted from the outside (hereinafter, referred to as a transport stream).
It is called "TS". ) Is received and decoded, PID and each module ID belonging to the PID are set as filtering conditions from the decoded data and filtered, the material packet data is extracted in module units, and the extracted modules are stored in the data storage unit 101. In the allocation storage area allocated to the module.

In the above, the PID of the extracted carousel
If a carousel having the same PID as that of the above is already stored in the data storage unit 101, the extracted carousel is overwritten and stored in the storage area in which the carousel is stored. As a result, the carousel extracted immediately before is stored in the data storage unit 101. The extracted data counting unit 103 counts the number of material packet data (hereinafter, referred to as “input packet data number”) received by the data extracting unit 102 from the data extracting unit 102 per predetermined time for each module ID and counts. Each mod you did
The number of input packet data for each ule ID is output to the data composition ratio determination unit 104.

FIG. 5 is a table showing an example of the number of input packet data for each module ID counted by the extracted data counting unit 103. The PID column 510 indicates the PID of the received material packet data, and indicates that the PID of the received material packet data is of two types, 100 and 101. The module ID column 520 shows the module ID of the received material packet data. The carousel with PID 100 is composed of two types of modules with module IDs 0 and 1, and the carousel with PID 101 has module IDs 0, 1 and 2. It is shown that it is composed of three types of modules.

The input packet number column 530 for the past 1 second is
Indicates the number of input packet data counted for each module ID. For carousel with PID 100, module
The number of input packet data whose ID is 0 is 375, the number of input packets whose module ID is 1 is 125, and the number of input packet data whose module ID is 0 is 600 for the carousel whose PID is 101.
It indicates that the number of input packets having a D of 1 is 200 and the number of input packets having a module ID of 2 is 200.

Based on the number of input packet data for each module ID input by the extracted data counting unit 103, the data composition ratio determining unit 104 determines the material packet data to be output per fixed time between each carousel type. The composition ratio (hereinafter referred to as "carousel composition ratio") and the composition ratio of the material packet data (hereinafter referred to as "module composition ratio") that should be output per unit time between the types of modules are determined, and the determined carousel is determined. The material packet data to be sequentially output is determined for each section so as to match the composition ratio and the module composition ratio, and the determined output target section is notified to the data output unit 105.

Specifically, the ratio of the number of input packet data for each carousel (hereinafter referred to as "PID ratio").
And the ratio of the number of input packet data for each module forming the carousel (hereinafter referred to as “module ratio”), the carousel composition ratio should be determined according to the calculated PID ratio, and further output according to the module ratio. The module composition ratio in the carousel is determined, and the sections to be sequentially output are determined in order of the arrangement of the sections in the module to which the relevant section belongs so that the determined carousel composition ratio and the module composition ratio are determined. Output part 1
Notify 05.

The material packet data to be sequentially output is decided in section units because the MPEG2 standard prohibits the transmission of packet data of different sections in the same PID in a mixed manner. Is. Explaining using the example of FIG. 5, since the PID ratio for the carousel with PID 100 and PID 101 is 1: 2, the data composition ratio determination unit 104 determines that the carousel with PID 100 and the carousel with PID 101. The output target sections are sequentially determined so that the carousel composition ratio is 1: 2.

Further, in this output target section sequential determination processing, since the carousel of each PID has a module ratio of 3: 1 for the carousel having a PID of 100,
Modules with a module ID of 0 and modules with a module ID of 1 have a module composition ratio of 3: 1.
The output target section is sequentially determined from the sections belonging to the ID, and the module ratio of the carousel with the PID of 101 is 3: 1: 1, so the module with the module ID of 0, the module with the module ID of 1, and the module
The module configuration ratio of the module with ID 2 is 3: 1: 1
The output target section is sequentially determined from the sections belonging to each module ID so that the output target section is sequentially notified to the data output unit 105.

Here, the data composition ratio determination unit 104 notifies the PID of the carousel, the module ID of each module configuring the carousel, the block number of the section configuring each module, and the data output unit 105 immediately before. The management information table indicating the correspondence with the block number of the output target section is held, and the output target section is sequentially determined based on the information indicated by the management information table.

FIG. 6 is a table showing an example of the management information table. The PID column 610 shows the PID of each carousel, the module ID column 620 shows the module ID of the module that constitutes each carousel, and the block Num of the final section.
The ber column 630 shows the block number of the final section which constitutes each module, and the immediately preceding notification block number column 64
0 indicates the block number of the output target section notified immediately to the data output unit 105. For example, in FIG. 6, the data composition ratio determination unit 104 determines the module ID of the PID 100.
When the module having 0 is determined to be the output target module, the data configuration ratio determination unit 104 acquires 2 which is the immediately preceding notification block number in the module, and uses the acquired block number and the blockNumer of the last section in the module. Compare the magnitude relationship with a certain L1, and if 2 is smaller than L1, determine the section whose block number, which is the next block number in the module, is 3 as the output target section, and determine the PID and module ID of the determined section. And block number for the data output unit 10
5 to notify immediately before notification of the management information table block Number
The immediately preceding notification block Number in the column 640 is updated to 3.

On the other hand, when 2 is not smaller than L1, the first section (block Number
Of 0) is determined as the output target section, and the PID, module ID, and block Nu of the determined section are determined.
mber is notified to the data output unit 105, and the last notice block Numb of the last notice block Number column 640 of the management information table.
Update er to 0.

The PID column 6 in the management information table
10, module ID column 620, block Num of the last section
The information in the ber column 630 may be set in advance,
It may be included in the material packet data to be transmitted (for example, the first material packet data in the carousel of each PID) in advance and acquired by the data composition ratio determination unit 104 via the data extraction unit 102.

FIG. 7 shows the parameters used by the data composition ratio determination unit 104 to determine the output target PID and the output target section. The PID column 710 shows the PID of each carousel, and the PID multiple count column 720 shows each PI.
The PID multiplex count for D is shown, the PID multiplex cumulative count column 730 shows the PID multiplex cumulative count for each PID, the module ID column 740 shows the moduleID of the modules that make up each carousel, and the module multiplex count column 750. Indicates the module multiplex count for each module ID, and the PID multiplex cumulative count column 760 indicates each m
Indicates the module multiple cumulative count for the odule ID.

The data composition ratio determination unit 104 determines the PID for each PID.
Calculate the multiple count and PID multiple integrated count, and m
The module multiplex count and the module multiplex integrated count are calculated for each odule ID. Here, the “PID multiplex count” refers to a value set so as to have a relationship of a PID ratio and an inverse ratio. For example, referring to the example of FIG. 5, regarding a carousel with a PID of 100 and a PID of 101,
PID ratio 1: is a 2, expressed this in PID multiplex count ratio, as shown in FIG. 7 6 2: 1. Further, the value of the PID multiplex count may be set to be an inverse ratio of the PID ratio. For example, when the PID multiplex count of a carousel having a PID of 100 is set to 1 instead of 2, the PID is set to 101.
The carousel PID multiplex count may be set to 0.5 instead of 1.

"PID multiple integrated count" means that in the operation of the output target PID and section determination processing described later,
It refers to the parameter for determining the output target PID, and refers to the value obtained by adding the PID multiplex count for the PID to the initial value every time the output target section in the carousel of the output target PID is determined. . Figure 8
4 is an example of a table showing the state of the PID multiplex integrated count held by the data composition ratio determination unit 104. Figure 8
(A) shows that each PID multiplex integrated count is in the initial state. In this state, the data composition ratio determination unit 104 targets a carousel with a PID of 100 (PID is 1
The carousel of 01 may be the output target. ), When the output target section in the carousel as the output target is determined, the multiplex integration count 2 of the PID is added to the multiplex integration count of PID 100, and the PID multiplex integration count table is updated to the state of FIG. 8B.

Next, the data composition ratio determination unit 104 determines, in the updated PID multiplex integrated count table, the carousel having a PID of 101, which has a small PID multiplex integrated count value, as the output target, and determines the output target section in the carousel that is the output target. Then, the PID multiplex count of 1 is added to the multiplex count of PID 101, and the PID multiplex count table is updated to the state of FIG. 8C. Further, the data composition ratio determination unit 104 repeats the above-mentioned processing to repeat the update of the PID multiplex integrated count table.

The "module multiplex count" refers to a value set so as to have a relationship of a module ratio and an inverse ratio. For example, using the example of FIG. 5, the PID is 1
The module ratio for the 00 carousel is 3: 1, which is shown in FIG.
It becomes 1: 3 as shown in. The value of the module multiplex count may be set so as to be the inverse ratio of the module ratio. For example, mod in a carousel with a PID of 100.
When the module multiplex count of ule ID 0 is set to 1 instead of 8, the module multiplex count of module ID 1 may be set to 3 instead of 24.

The "module multiplex integrated count" refers to a parameter for determining the output target section in the operation of the data composition ratio determination process described later, and the section is output every time the output target section is determined. It is a value obtained by adding a value obtained by multiplying the module multiplex count value of the module to which the material packet data number included in the output target section (hereinafter referred to as "module multiplex count multiplication value") to the initial value.

FIG. 9 is an example of a module multiplex integration count table showing the state of the module multiplex integration count held by the data composition ratio determination unit 104. Figure 9
(A) is a module ID in a carousel with a PID of 101
Indicates that each multiplex integrated count of 0 to 2 is in the initial state. In this state, the data composition ratio determination unit 104 modu
The module whose leID is 0 is targeted for output (other module ID
The module may be set as the output target. ),
When the output target section of the module to be output is determined, the module multiplex integrated count of module ID 0 is added to the module multiplex count multiplication value 50 of the module ID (here, the number of material packet data included in the section is uniformly used for convenience of description. As the module multiplex count, each module multiplex count value with a PID of 101 shown in the example of FIG.
The module multiplex count multiplication value is calculated using 15) for the module whose odule ID is 2. ) Is added and the module multiplex integrated count table is shown in FIG. 9 (B).
Update to the state of.

The module multiplex count multiplication value 50 with the module ID of 0 is calculated by multiplying the module multiplex count of 5 with the module ID of 0 by the number of material packet data 10 included in the output target section. Thereafter, similarly, the module multiplex count multiplication values of module ID 1 and 2 are calculated. Next, the data composition ratio determination unit 104 sets the module with a small module multiplex integrated count value and module ID 1 as the output target in the updated module multiplex integrated count table (module
The module with ID 2 may be the output target. ), When the output target section in the module to be output is determined, the module multiplex integrated count of moduleID 1 is added to the module multiplex count multiplication value 15 of the module ID.
0 is added and the module multiplex integrated count table is updated to the state of FIG. Further, the data composition ratio determination unit 1
04 repeats the above process to repeat the update of the module multiplex integrated count table.

The operation of the process of determining the output target PID and the output target section performed by the data structure ratio determining unit 104 will be described later. The data output unit 105 has a memory for storing the material packet data to be output, and based on the PID, module ID, and block Number of the output target section notified from the data composition ratio determination unit 104, The included material packet data is read from the data storage unit 101, the read material packet data is written in the memory as a queue in the arrangement order of the material packet data in the section, and the written material packet data is written in the written order in the data output rate storage unit. Output at the total output bit rate stored in 106.

As a result, the total output bit rate is distributed to each carousel and each module according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determining unit 104, and the total output bit rate is distributed for a certain period of time. The composition ratio between each carousel and each module output per hit will also be determined. Here, the “total output bit rate” refers to the output bit rate of the entire material packet data set in advance by the operator.

Further, "outputting" means transmitting via broadcasting or a line. Data output rate storage unit 10
6 stores the total output bit rate preset by the operator. <Operation> Next, the output target performed by the data composition ratio determination unit 104
The operation of the PID and output target section determination processing will be described. The operation of the above process will be described below.

FIG. 10 is a flowchart showing the output target section determination processing performed by the data composition ratio determination unit 104. The data structure ratio determination unit 104 determines the minimum PID multiplex integrated count (M1) indicating the minimum value of the PID multiplex integrated count.
Is set to infinity, which is the initial value (step S100
1) The PID multiplex integrated counts are sequentially read from the PID multiplex integrated count table (step S1002), and it is compared whether or not the read PID multiplex integrated count is smaller than M1 (step S1003).

If smaller (step S1003: Y),
The PID multiplex integrated count is set to the minimum PID multiplex integrated count (M1) (step S1004), and it is determined whether the comparison has been completed for all the read PID multiplex integrated counts (step S1005). When the comparison is completed (step S1005: Y), the PID indicating the PID multiplex integrated count value set in the minimum PID multiplex integrated count (M1) is determined as the output target PID (step S100).
6) The output target section is determined for the determined output target PID (step S1007, step S1).
The contents of the processing in 007 will be described later. ), The PID multiplex integrated count of the target PID is added to the PID multiplex integrated count of the PID (step S1008), and the PID multiplex integrated count of the PID of the PID multiplex integrated count table is updated to the added value (step S1009), Step S
The processing from 1001 to step S1009 is repeated.

If it is not smaller in step S1003 (step S1003: N), step S1005.
Process. If the comparison is not completed in step S1005 (step S1005: N), the processes of steps S10023 to Ss1005 are repeated.

FIG. 11 is a flow chart showing the contents of the processing in step S1007 performed by the data composition ratio determining unit 104. When determining the output target PID in step S1006, the data composition ratio determination unit 104 sets the minimum module multiplex integrated count (M2) indicating the minimum value of the module multiplex integrated count to infinity, which is the initial value (step S1101). The module multiplex integrated counts are sequentially read from the module multiplex integrated count table (step S1102), and it is compared whether the read module multiplex integrated count is smaller than M2 (step S1103).

If it is smaller (step S1103: Y),
The module multiplex integrated count is set to the minimum module multiplex integrated count (M2) (step S110).
4) It is determined whether or not the comparison has been completed for all read module multiplex integrated counts (step S1).
105). When the comparison is completed (step S1105:
Y), the module indicating the module multiplex integrated count value set in the minimum module multiplex integrated count (M2) is determined as the output target module (step S110).
6) By referring to the information in the management information table,
Data output unit 1 in the determined output target module
The section next to the output target section notified immediately before to 05 (the first section in the output target module when the section notified immediately before does not exist or the section notified immediately before is the final section) is set as the output target section. Decide (step S1107),
The determined output target section is notified to the data output unit 105 (step S1108, regarding the material packet data output processing performed by the notified data output unit 105,
It will be described later. ), And adds the module multiplex count multiplication value calculated for the module to the module multiplex integrated count of the output target module (step S110).
9), the module multiplex integrated count of the module multiplex integrated count table is updated to a value obtained by adding (step S1110), and step S10 of FIG.
08 processing is performed.

If it is not smaller in step S1103 (step S1103: N), step S1105.
Process. If the comparison is not completed in step S1105 (step S1105: N), the processes of steps S1102 to S1105 are repeated. Next, the material packet data output process performed by the data output unit 105 that has received the notification of the output target section from the data composition ratio determination unit 104 will be described.

FIG. 25 is a flowchart showing the material packet data output process performed by the data output unit 105.
Based on the PID, moduleID, and block Number of the output target section notified from the data composition ratio determination unit 104 in step S1108 of FIG. 11, the data output unit 105 stores the material packet data included in the section from the data storage unit 101. Read (step S2401),
The read material packet data is written in the memory as a queue in the order of arrangement of the material packet data in the section (step S2402), and the total output bit rate stored in the data output rate storage unit 106 is read (step S2403). At the output bit rate, each written material packet data is output in the written order (step S2404).

As a result, the material packet data belonging to each carousel and each module is distributed according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determination unit 104 according to the PID ratio and the module ratio, and the data output unit 105. Is written in the memory and output from the memory, the total output bit rate is distributed to each carousel and each module according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determination unit 104 according to the PID ratio and the module ratio. Then, the composition ratio between each carousel and each module output per fixed time is also determined.

(Second Embodiment) In the data transfer apparatus 100 according to the first embodiment, the number of input packet data is acquired by the extracted data counting unit 103, and the carousel composition ratio and module configuration are obtained based on the acquired number of input packet data. Although the ratio is decided, the data transfer apparatus 200 of the present embodiment acquires the output bit rate information from the TS transmitted from the outside, and based on the acquired output bit rate information, the carousel composition ratio and the module. Determine the composition ratio.

Here, the "output bit rate information" means
This is the information indicating the output bit rate distributed to each module. <Structure> FIG. 12 shows a structure of a main part of the data transfer apparatus 200 according to the embodiment of the present invention. Data transfer device 2
00 includes a data storage unit 101, a data extraction unit 102, an extracted data analysis unit 203, a data composition ratio determination unit 104, a data output unit 105, and a data output rate storage unit 106.

The same components as those of the data transfer apparatus 100 according to the first embodiment shown in FIG. 1 are designated by the same reference numerals, and different points will be mainly described. In the present embodiment, the output bit rate information is embedded in the TS and transmitted as packet data to which an output information identifier for identifying the output bit rate information is added.

FIG. 13 shows an example of the contents of the output bit rate information rate. The PID column 510 indicates the PID of the output carousel, and the PID of the output carousel is 100.
And 101 are shown. module ID field 52
0 indicates the module ID of the output module, PID1
The 00 carousel consists of two types of modules with module IDs 0 and 1, and the PID 101 carousel is module
It indicates that the ID consists of three types of modules, 0, 1, and 2.

The module rate column 530 shows each module I
Indicates the output bit rate distributed to the D modules, P
For the carousel with ID 100, the output bit rate of the module with module ID 0 is 375 Kbps (kilobits per second), the output bit rate of the module with module ID 1 is 125 Kbps, and the carousel with PID 101 is , The module with module ID 0 has an output bit rate of 600 Kbps, and the module with module ID 1 has an output bit rate of 200 Kbps.
Output bit rate of module with ID 2 is 200Kbps
Is shown.

The data extraction unit 101 extracts the packet data having the output information identifier from the TS and outputs it to the extracted data analysis unit 203. The extracted data analysis unit 203 acquires output bit rate information from the packet data having the output information identifier input from the data extraction unit 101, and uses the acquired output bit rate information as the data structure ratio determination unit 104.
Output to.

The data composition ratio determination unit 104 determines the carousel composition ratio and the module composition ratio based on the output bit rate information input by the extracted data analysis unit 203, and conforms to the determined carousel composition ratio and the module composition ratio. As described above, the material packet data to be sequentially output is determined for each section, and the determined output target section is notified to the data output unit 105.

Output target performed by the data composition ratio determination unit 104
The operations of the PID determination processing and the output target section determination processing are the same as in the case of the first embodiment, so description thereof will be omitted. (Embodiment 3) <Structure> FIG. 14 shows a structure of a main part of a data transfer apparatus 300 according to an embodiment of the present invention. Data transfer device 3
00 includes a data storage unit 101, a data extraction unit 102, a data composition ratio determination unit 104, a data output unit 105, a data output rate instruction unit 303, and an instruction information storage unit 306.

The same components as those of the data transfer apparatus 100 according to the first embodiment shown in FIG. 1 are designated by the same reference numerals, and different points will be mainly described below. The data output rate instructing unit 303 receives the setting of the total output bit rate, the PID rate ratio, and the module rate ratio from the operator, stores them in the instruction information storage unit 306, and stores the material data at the set total output bit rate. To the data output unit 105, and also notifies the data component ratio determination unit 104 of the set PID rate ratio and module rate ratio.

Here, the "PID rate ratio" means a ratio indicating a ratio of allocating the total output bit rate to the carousel of each PID. The “module rate ratio” refers to a ratio indicating the ratio of the output bit rate distributed to the carousel of each PID according to the PID rate ratio, to the module of each module ID belonging to the PID.

The instruction information storage unit 306 stores the total output bit rate, the PID rate ratio, and the module rate ratio (hereinafter referred to as "instruction information" collectively for three items) set by the operator.
Say. ) Is remembered. FIG. 15 is a table showing an example of instruction information. Total output bit rate column 1510
Indicates the total output bit rate of material data, and PID column 1
520 indicates the PID of each carousel that composes the material data, and the PID rate ratio column 1530 indicates the PI allocated to each PID.
The D rate ratio is shown, the module ID column 1540 shows the module ID of the module that constitutes each carousel, and the module rate ratio column 1550 shows the module rate ratio distributed to the module of each module ID.

The data composition ratio determination unit 104 determines the PID multiplex count and PI for each PID based on the PID rate ratio and the module rate ratio notified from the data output rate instruction unit 303.
D multiplex integrated count is set, and the module multiplex count and module multiplex integrated count are set for each module ID. Specifically, the PID multiplex count is set for each PID so that the ratio of the PID multiplex count in each PID is inversely related to the PID rate ratio, and the PID for each PID is set based on the set PID multiplex count. Calculate multiple integrated counts.

Further, the module multiplex count is set for each module ID so that the ratio of the module multiplex counts in each module ID has a relation of the module rate ratio and the inverse ratio, and based on the set module multiplex count,
Calculate the module multiple integration count for each module ID. The PID multiplex integrated count and the module multiplex integrated count are calculated in the same manner as in the first embodiment.

The operation of the output target PID and output target section determination processing performed by the data structure ratio determination unit 104 is the same as in the first embodiment, and therefore the description thereof is omitted. Accordingly, the material packet data belonging to each carousel and each module is distributed by the data output unit 105 according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determination unit 104 according to the PID rate ratio and the module rate ratio. Since the data is written in the memory and output from the memory, the total output bit rate is determined by the data composition ratio determination unit 104 according to the PID rate ratio and the module rate ratio. The composition ratio between each carousel and each module, which is distributed and output per fixed time, is also determined.

Explaining in the example of FIG. 15, the total output bit rate of 2000 Kbps is P2 at a ratio of PID rate ratio 1: 2.
It is distributed to the carousel with an ID of 100 and the carousel with a PID of 101 (667 Kbps for the former and 1333 Kb for the latter).
ps is allocated. ), And the bit rate of 667 Kbps allocated to the carousel having 100 PIDs is the module rate ratio between the modules constituting the carousel concerned is 2:
At a ratio of 1, the module with module ID 0 and the module with module ID 1 are redistributed (445 Kbps for the former and 222 Kbps for the latter) and 1333 bps for the carousel with PID 101. The bit rate is
The module rate is 3: 1: 1 between the modules that make up the carousel, and the module IDs are 0 and 1, respectively.
Redistributed to each module of 2 (each 800Kbp
s, 266 Kbps, 266 Kbps are allocated).

As described above, in the present embodiment, it is possible to adjust the output bit rate of the carousel and the module forming the material data to a desired output bit rate, if necessary. (Embodiment 4) In the data transfer device 300 according to the third embodiment, the instruction information is acquired from the data output rate instruction unit 303. It is acquired from the TS transmitted from the outside. <Structure> FIG. 16 shows a structure of a main part of the data transfer apparatus 400 according to the embodiment of the present invention. Data transfer device 4
00 includes a data storage unit 101, a data extraction unit 102, an instruction information analysis unit 403, a data composition ratio determination unit 104, a data output unit 105, and a data output rate storage unit 106.

The same components as those of the data transfer device 300 according to the third embodiment shown in FIG. In the present embodiment, the instruction information is embedded in the TS and transmitted as packet data to which an instruction information identifier for identifying the instruction information is added. Since the content of the instruction information is the same as that of FIG. 15, the description will be omitted.

The instruction information analysis unit 403 is the data extraction unit 1
The instruction information is acquired from the packet data having the instruction information identifier input from 02, and the acquired instruction information is output to the data composition ratio determination unit 104. Data composition ratio determination unit 10
4 is material packet data that should be sequentially output so as to determine the carousel composition ratio and the module composition ratio based on the instruction information input by the instruction information analysis unit 403, and to match the determined carousel composition ratio and module composition ratio. Is determined for each section, and the determined output target section is notified to the data output unit 105.

Output target performed by the data composition ratio determination unit 104
The operation of the PID and output target section determination processing is the same as in the case of the first embodiment, so description thereof will be omitted. (Fifth Embodiment) <Structure> FIG. 17 shows a structure of a main part of a data transfer apparatus 500 according to an embodiment of the present invention. Data transfer device 5
00 is a data storage unit 101, a data extraction unit 102, an extracted data counting unit 103, a data composition ratio determination unit 10
4, data output unit 505, data output rate storage unit 10
6, an AV data acquisition unit 507, and a Null packet detection unit 508.

The same components as those of the data transfer apparatus 100 according to the first embodiment shown in FIG. 1 are designated by the same reference numerals, and different points will be mainly described below. The video data acquisition unit 507 receives and receives a TS including video packet data, audio packet data, and Null packet data (hereinafter, three packet data are collectively referred to as “AV packet data”) transmitted from the outside. Each AV packet data is output to the data output unit 505.

The Null packet detection unit 508 detects Null packet data from the AV packet data received by the video data acquisition unit 507 by recognizing the PID assigned to the Null packet data, and Nu
When the 11 packet data is detected, a detection signal is output to the data output unit 505. Here, "Null packet data" means that when the amount of packet data such as video data sent from the transmitting side fluctuates with time, the amount of packet data is insufficient to keep it at a predetermined amount. It refers to dummy packet data that is added to supplement the amount of packet data that is stored and that is not involved in the reproduction and display of data having a preset PID.

The data output unit 505 performs a writing process of material packet data and a selection process of packet data to be output. First, the process of writing the material packet data will be described. Similar to the data output unit 105 of the first embodiment, the data output unit 505 has a memory for storing the material packet data to be output, and the PI of the output target section notified from the data composition ratio determination unit 104.
Based on D, module ID and block number, the material packet data included in the section is stored in the data storage unit 101.
Read out and write the read material packet data in the memory as a queue.

Next, the packet data selection process will be described. The data output unit 505 selects the packet data to be output and outputs the selected packet data. Specifically, the AV input from the video data acquisition unit 507
Nul within a predetermined time after packet data is input
l When the detection signal input from the packet detection unit 508 is not detected, the AV packet data is selected as the packet data to be output, the selected AV packet data is output, and the detection signal input is detected within a predetermined time. The AV packet data input from the video data extraction unit 507 is recognized as Null packet data, and the material packet data at the head of the queue written in the memory is output instead of the Null packet data.

As a result, each Null packet data included in the data stream of the extracted AV packet data is sequentially selected according to the priority order according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determination unit 104. It is replaced with each material packet data of different types and output. FIG. 18 shows an example of a data stream of AV packet data received by the video data acquisition unit 507. In FIG. 18, the data 2 is
AV packet data other than Null packet data is shown, and NULL shows Null packet data.

FIG. 19 shows an example of a data stream which the data output unit 505 receives from the video data extraction unit 507 and receives the AV packet data shown in FIG. In FIG. 18, data 1 is the data output unit 505.
Indicates the material packet data replaced and output instead of the Null packet data. <Operation> Next, the operation of the packet data selection process performed by the data output unit 505 will be described. FIG. 20 is a flowchart showing the operation of the packet data selection process performed by the data output unit 505. The operation of the selection process will be described below with reference to the flowchart of FIG.

The data output unit 505 receives the AV packet data from the video data acquisition unit 507 (step S
1201: Y), it is determined whether a detection signal is input from the Null packet detection unit 508 within a predetermined time (step S1202). If there is input (step S12)
02: Y), the top packet data of the material packet data stored as a queue in the memory is read, the material packet data is selected as the packet data to be output (step S1203), and the selected packet data is output (step S1203). S1204).

When there is no input (step S1202:
N), the received AV packet data is selected as the packet data to be output (step S1205), and the selected packet data is output (step S1204). (Sixth Embodiment) In the data transfer apparatus 100 according to the first embodiment, the material packet data is output according to the carousel composition ratio and the module composition ratio determined according to the PID ratio and the module ratio. The data transfer device 600 of this form outputs the material packet data according to the preset data composition ratio. <Structure> FIG. 21 shows a structure of a main part of the data transfer apparatus 600 according to the embodiment of the present invention. Data transfer device 6
00 includes a data storage unit 101, a data extraction unit 102, a data output unit 605, and a data output rate storage unit 106.

The same components as those of the data transfer apparatus 100 according to the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the differences will be mainly described below. The data output unit 605 performs a data composition ratio determination process of the material packet data to be output and an output process of the material packet data. First, the data composition ratio determination process will be described. The data output unit 605 follows the order of PID, module ID, and block Number, which are the identifiers of the material packet data, in the order of the numbers indicated by the identifiers (for example, in the material data shown in FIG. 4, packet data 421, 422,
Material packet data to be output is determined, and the material packet data determined as a queue is sequentially written to the memory of the data output unit 605. As a result, the data composition ratio of the material packet data having each PID and each module ID is determined.

Next, the output process of the material packet data will be described. The data output unit 605 outputs the material packet data written in the memory in the order of writing, at the total output bit rate stored in the data output rate storage unit 106. <Operation> Next, the operation of the data composition ratio determination process performed by the data output unit 605 will be described.

FIG. 22 is a flow chart showing the above operation. The data output unit 605 sets the PID next to the PID included in the material packet data output immediately before as the output target PID (step S1301). Here, when there is no material packet data output immediately before and the data composition ratio determination process is started, the first PID is set as the output target PID. Further, the data output unit 605 determines whether the material packet data output immediately before in the carousel of the output target PID is the final material packet data in the section (step S1302). Whether or not it is the final material packet data in the section can be determined, for example, by adding a flag indicating the final material packet data to the final material packet data.

If it is the final material packet data (step S1302: Y), it is determined whether the section to which the final material packet data belongs is the final section in the module to which the section belongs (step S1303). Whether it is the final section,
For example, it is determined by comparing the number of sections in the module to which the section belongs and the section number indicating the number of the section in the module indicated by the header information included in the head material packet data of each section. can do.

If it is the final section (step S1)
303: Y), the module to which the section belongs is
It is determined whether or not the module is the final module in the carousel to which the module belongs (step S1304).
Whether or not the module is the final module is stored, for example, in the data storage unit 101, the final module ID of the module forming the carousel of each PID, and the data output unit 605 stores the final module ID stored and the section to which the section belongs. It may be judged by comparing with the module ID of the module, or the DII included in the carousel of each PID.
The information of the final module ID is described in (DownloadInfoIndication), and the data output unit 605 is the DII extracted by the data extraction unit 102 and stored in the data storage unit 101.
It may be judged based on the information of the final module ID described in.

If it is the final module (step S1)
304: Y), the first material packet data belonging to the first section of the first module in the carousel of the PID next to the output target PID is set as the output target packet data (step S1305), and the material packet data is written to the memory (step S1305). S1306). Step S13
02, if it is not the final material packet data (step S1302: N), the material packet data next to the material packet data in the section is set as the output target packet data (step S1307), and the material packet data is written in the memory (step S1307). S13
06).

If it is not the final section in step S1303 (step S1303: N), the first material packet data belonging to the section next to the relevant section in the module to which the relevant section belongs is set as the output target packet data (step S1308), and the relevant material Write packet data to memory (step S1
306).

If the module is not the final module in step S1304, step S1304: Y), the first material packet data belonging to the first section of the module following the module in the carousel to which the module belongs is set as the output target packet data (step S1309). , Write the material packet data to the memory (step S
1306).

In the above processing, the output target packet data is sequentially determined from the head material packet data of the carousel of each PID, but the procedure of the determination processing is not limited to the above case. For example, prioritization may be performed between modules and material packet data determination processing may be performed in order of priority, or priority may be assigned between carousels and material packet data determination processing may be performed in order of priority. May be Also, the output target packet data may be determined so that the material packet data in the sections having different PIDs are mixed.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments. For example, in the first embodiment, the data output unit 105 outputs the material packet data written in the memory at the total output bit rate stored in the data output rate storage unit 106. May be output while changing the total output bit rate for Specifically, the operator inputs a new total output bit rate to the data output rate storage unit 106 at any time,
The data output unit 105 can change the total output bit rate with time and output the material packet data. Further, the plurality of total output bit rates are stored in the data output rate storage unit 106 in association with the time information indicating the time zone in which the total output bit rate is output, and the data output unit 105 stores the stored time information. Based on this, the corresponding total output bit rate may be selected and output.

As a result, according to the carousel composition ratio and the module composition ratio determined by the data composition ratio determining unit 104, the material packet data can be output at a desired total output bit rate according to time. or,
In the first embodiment, the data composition ratio determination unit 104
Indicates that each data input by the extracted data counting unit 103
The carousel composition ratio and the module composition ratio were decided based on the number of input packet data for each module ID.
The distribution ratio of the total output bit rate may be determined for each ule ID, and the carousel composition ratio and the module composition ratio may be determined based on the determined distribution ratio.

Further, in the first embodiment, the data composition ratio determination unit 104 determines the carousel composition ratio and the module composition ratio element based on the number of input packet data for each module ID input by the extracted data counting unit 103. Although it is decided to decide, a part (for example, the material packet data group whose PID is 101 in the first embodiment) may be decided according to a preset bit rate regardless of the number of input packet data.

In addition, in the third and fourth embodiments, the data composition ratio determining unit 104 sets the PID multiplex count and the module multiplex count based on the PID rate ratio and the module rate ratio, respectively. Only the multiplex count should be set based on the PID rate ratio, and the module multiplex count should be set based on the module ratio calculated based on the number of input packet data for each module forming the carousel, as in the first embodiment. May be In this case, by adding the extracted data counting unit 103 as a component of the data transfer devices 300 and 400, the function performed by the data configuration ratio determining unit 104 can be realized.

Similarly, only the module multiplex count is set based on the module rate ratio, and the PID multiplex count is
Similar to the first embodiment, it may be set based on the PID ratio calculated based on the number of input packet data for each carousel. Also, in the third embodiment, the PID
Instead of using rate ratios and module rate ratios, each
An output bit rate of the material packet data for calculating the PID rate ratio and the module rate ratio may be assigned for each PID and module ID. In this case, the data composition ratio determination unit 104 calculates the PID rate ratio and the module rate ratio based on the output bit rate assigned to the carousel and the module of each PID and each module ID,
The same processing as in the third embodiment is performed.

In the above case, the output bit rate of the material packet data may be assigned to some carousels instead of using the PID rate ratio and the module rate ratio. In this case, the output bit rate obtained by subtracting the allocated output bit rate from the total output bit rate is distributed to the carousel and module of each PID and each module ID according to the ratio indicated by the PID rate ratio and the module rate ratio. It will be.

Further, in the third embodiment, two parameters of the PID rate ratio and the module rate ratio are used to distribute the total output bit rate, but only the module rate ratio may be used. In this case, the total output bit rate depends on the ratio indicated by the module rate ratio.
It will be distributed to the module of each module ID.
Also, in the above case, instead of using the module rate ratio, an output bit rate for calculating the module rate ratio may be assigned to each module of each module ID. In this case, the data composition ratio determination unit 104
Calculates the module rate ratio based on the output bit rate assigned to the module of each module ID, and performs the same processing as the above case.

In the above case, the output bit rate may be assigned to some modules instead of using the module rate ratio. in this case,
The output bit rate obtained by subtracting the allocated output bit rate from the total output bit rate will be distributed to the modules of each module ID according to the ratio indicated by the module rate ratio.

Further, in the third embodiment, even when the material packet data of moduleID for which the module rate ratio is not set is extracted, the predetermined output bit rate may be distributed. For example, in the example of FIG. 15, when the material packet data of the module whose module ID is 2 and the module rate ratio of which is not set is extracted, a predetermined module rate ratio (for example, 1) may be distributed to the module. Good.

Further, in the third embodiment, when the material packet data of the module ID for which the module rate ratio is set is not extracted, the predetermined module rate ratio may be distributed to the modules other than the module ID. . For example, in the example of FIG. 15, when only the material packet data with module IDs 0 and 1 is extracted from the modules with PID 101, the module rate ratio set for the module with module ID 2 is set. May be ignored, and the output bit rate may be distributed to the modules having module IDs 0 and 1 at a module rate ratio of 3: 1.

Further, in the third and fourth embodiments, the total output bit rate is pre-allocated to two output bit rates, that is, the minimum output bit rate and the surplus output bit rate, and the minimum output bit rate is allocated to each carousel to obtain the surplus. The output bit rate may be redistributed to the carousel and the module of each PID and module ID prioritized based on the PID rate ratio and the module rate ratio. The distribution ratio of the output bit rate may be fixedly set in advance, or may be temporally changed by an operator's input or the like.

In the third and fourth embodiments, the PID rate ratio, module rate ratio, and total output bit rate are
It may be changed according to time by an operator's input. Further, in the fifth embodiment, each N included in the data stream of the extracted AV packet data is
The full packet data is to be output after being replaced with each material packet data determined by the data composition ratio determination unit 104, but the replaced packet data is
The packet data is not limited to Null packet data, and may be AV packet data having another specific PID, or may be AV packet data of a plurality of types.

In the fifth embodiment, instead of replacing the packet data, packet data having a specific PID may be detected and the PID may be rewritten to a predetermined PID and output. In the data transfer device 500, for example, the above-described function is performed by the Null packet detection unit 508.
When a specific PID is detected, the detection signal is sent to the data output unit 50.
5 is added, a function for storing a predetermined PID to be rewritten is added to the data storage unit 101, and the data output unit 505 receives the detection signal from the Null packet detection unit 508. Storage unit 10
It can be realized by adding a function of reading a predetermined PID to be rewritten from 6, and rewriting the PID of the packet data having the detected specific PID to the read predetermined PID to output the packet data.

Further, in the first to fourth embodiments, when the output target PID notified from the data composition ratio determining unit 104 is a specific PID, the data output unit 105 includes the output target section belonging to the PID. Rewrite the PID of each material packet data to the specified PID, write it to the memory,
It may be output. The above-described function is added with, for example, a function of storing a rewriting target PID for identifying a PID to be rewritten in the data storage unit 101 and a rewritten PID for specifying a rewritten PID of the PID in association with each other. Then, the data output unit 105 is connected to the data composition ratio determination unit 1
Each time the output target PID is notified from 04, the notified PID
Determines whether the PID matches the rewrite target PID, and only when the PID matches the rewrite target PID, the post-rewrite PID corresponding to the rewrite target PID is read from the data storage unit 101, and the P of each material packet data is read.
It can be realized by adding the function of rewriting the ID to the read PID. There may be a plurality of rewriting target PIDs and rewritten PIDs. In this case, the data storage unit 101 stores each x rewritten PID in association with each rewriting target PID.

In addition, in the first to fourth and sixth embodiments, the data transfer device may store the extracted material data every time the material data is updated. The above-mentioned function includes, for example, each material packet data including update information (for example, flag, version number) indicating that the material data has been updated, and the data extracting unit 102.
Based on the updated information of the extracted material packet data,
It is determined whether or not the material data has been updated. If the material data has been updated, the material packet data is stored in the data storage unit 10.
It can be realized by storing in 1. The material packet data unit to be updated may be a module unit or a carousel unit.

Further, instead of including the update information in each material packet data, the update information is included in the DII included in each carousel, and based on the update information included in the extracted DII,
The data extraction unit 102 may determine whether the material packet data has been updated. Further, in the first to fifth embodiments, the output target packet data determination processing is performed in section units, but it may be performed in material packet data units.

The output target PID determination processing in this case is the same as the processing shown in FIG. 10 except that the processing in step S1007 is the output target packet determination processing (step S2007), and therefore description thereof is omitted. .. Hereinafter, the output target packet data determination process performed by the data configuration ratio determination unit 104 in step 2007 will be described.

23 and 24 are flow charts showing the output target packet determination processing performed by the data composition ratio determination unit 104. The determination process will be described with reference to FIGS. 23 and 24. The data composition ratio determination unit 104
When the output target PID is determined in step S1006, it is determined whether the material packet data immediately before notified to the data output unit 105 in the material packet data belonging to the output target PID is the final packet data in the section to which the material packet data belongs. The determination is made (step S2101).

When the packet data is the final packet data (step S2101: Y), the data composition ratio determination unit 104 sets the minimum module multiplex integrated count (M2) indicating the minimum value of the module multiplex integrated count to infinity, which is the initial value. Then, each module multiplex integrated count is read in order from the module multiplex integrated count table (step S2103), and whether the read module multiplex integrated count is smaller than M2 is compared (step S2104).

If it is smaller (step S2104: Y),
The module multiplex integrated count is set to the minimum module multiplex integrated count (M2) (step S210).
5), it is determined whether the comparison has been completed for all the read module multiplex integrated counts (step S2).
106). When the comparison is completed (step S2106:
Y), the module showing the module multiplex integrated count value set in the minimum module multiplex integrated count (M2) is determined as the output target module (step S210).
7) By referring to the information in the management information table,
Data output unit 1 in the determined output target module
The section next to the output target section notified immediately before to 05 (the first section in the output target module if the section notified immediately before does not exist or the section notified immediately before is the final section) is the output target section. Determined (step S2108),
The first material packet data in the output target section is determined as the output target packet data (step S210).
9), the determined output target packet data is notified to the data output unit 105, the module multiplex count value of the module is added to the module multiplex count value of the output target module (step S2111), and the corresponding module multiplex count table is searched. Update the module multiplex integrated count to the added value (step S
2112).

In step 2101, if it is not the final packet data (step S2101: N), in the material packet data belonging to the output target PID, the material packet data next to the material packet data notified immediately before is determined as the output target packet data. (Step S211
0), notifies the data output unit 105, adds the module multiplex count value of the module to the module multiplex integrated count of the output target module to which the output target packet data belongs (step S2111), and adds the module to the module multiplex integrated count table. The module multiplex integrated count of is updated to the added value (step S21
12), the same processing as step S1008 in FIG. 10 is performed.

If it is not smaller in step S2104 (step S2104: N), step S2106.
Process. If the comparison is not completed in step S2106 (step S2106: N), the processes of steps S2103 to S2106 are repeated.
Note that in the above, the material packet data output process performed by the data output unit 105 that has received the notification of the determined output target packet data is that the process in step 2401 is a process of reading the notified output target packet data. The process is the same as the process shown in FIG. 25, except that the process in S2402 is a process for writing the read output target packet data in the memory.

[0115]

The present invention is a data transfer apparatus for receiving a data stream containing a plurality of types of repeat data that is repeatedly transmitted from a higher station and transferring the repeat data to a lower station. Storage means having a storage area for storing, extraction means for extracting each type of repeat data from the data stream received from the upper station, storage means for storing each extracted repeat data in the storage area, and fixed Data composition ratio determining means for determining the composition ratio between types of repeat data to be output per time, and each of the plurality of types of repeat data stored in the storage means are read and output at the determined composition ratio. And data output means.

Further, each of the repeat data may be composed of a plurality of packet data transmitted by a carousel transmission method, and the data stream may be a transport stream. Further, the present invention is
A data transfer method in a data transfer device having a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from a higher station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data The extraction step of extracting each type of repeat data from the data stream received from the upper station, the storing step of storing each extracted repeat data in the storage area, and the repeat data to be output per fixed time And a data output step of reading out each of the plurality of types of repeat data stored in the storage means and outputting the data at the determined composition ratio. Good.

Further, according to the present invention, a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from an upper station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A computer-readable recording medium for recording a program used in a data transfer device having: a program for extracting repeat data of each type from a data stream received from a higher station; A storage step of storing data in the storage area; a data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time; and each of the plurality of types stored in the storage means. A data output step for reading the repeat data and outputting it at the determined composition ratio. May be included.

Further, according to the present invention, a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from an upper station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A program used in a data transfer device having, an extracting step of extracting each type of repeat data from a data stream received from a higher station, a storing step of storing each extracted repeat data in the storage area, A data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time, and reading each of the plurality of types of repeat data stored in the storage means, and outputting at the determined composition ratio. And a data output step of

With this configuration, even when the data band that the local station can use is larger than the data band that the key station can use, the repeat data can be read by reading the stored repeat data a required number of times according to the band difference. Since it is possible to adjust the rate at which the repeat transfer is repeated, it is possible to transfer each repeat data at a predetermined composition ratio with high transmission efficiency by making the best use of the available data band.

Here, the storage area is composed of allocated storage areas for storing the plurality of types of repeat data one by one, and the storage means extracts the repeat data each time the repeat data is extracted. May be overwritten on the corresponding allocation storage area. With this configuration, the amount of memory for storing the material data can be reduced, and the latest material data can be always stored, so that even when the content of the material data is updated, it is possible to quickly The material data having the updated content can be broadcast and provided to the receiving device of the viewer.

Here, each of the plurality of types of repeat data is composed of a plurality of packet data, and the data composition ratio determining means extracts the packet of the repeat data extracted per predetermined time for each of the repeat data. The data composition ratio determining means may include a counting means for counting the number of data, and the data composition ratio determining means may determine the composition ratio based on a ratio of each count number between types of the repeat data.

With this configuration, each repeat data can be transferred at the same composition ratio as the composition ratio of each repeat data transmitted from the key station, which causes a difference in the content of the material data between the key station and the local station. It is possible to provide viewers with a data broadcast program of uniform content without causing the key station to have a composition ratio not intended by the key station side (for example, the repeat data that constitutes a menu screen for the user to select a data broadcast program). It is possible to prevent the material data from being broadcast to the viewer's receiving device with an extremely low composition ratio.

If the data band available to the local station is larger than the data band available to the key station, the repeat data can be transferred at a bit rate faster than that of the key station. A desired data broadcast program can be viewed with a shorter waiting time. Here, the data stream further includes output information data having output ratio information indicating a composition ratio between types of the respective repeat data to be output, and the extraction means further extracts the output information data, and the data structure. The ratio determining means may determine the component ratio based on the output ratio information included in the extracted output information data.

Further, the data stream further includes instruction information data having instruction information for instructing a composition ratio between types of repeat data to be output per fixed time and a total output bit rate, and the extracting means. Further extracts instruction information data from the data stream, the data composition ratio determining means determines the composition ratio based on the instruction information included in the extracted instruction information data, and the output means The plurality of types of repeat data stored in the storage means may be output at the total output bit rate indicated by the instruction information.

With this configuration, it is possible to previously adjust the composition ratio of each repeat data to be transferred from the local station on the key station side. The composition ratio of the repeat data can be changed, and the repeat data having a high viewing frequency can be transferred more frequently. Here, the output means is an output rate instruction information receiving means for receiving an input of instruction information for instructing a total output bit rate and a composition ratio between types of repeat data in a data stream output in a fixed time. The data composition ratio determining means includes instruction information storage means having a storage area for recording instruction information, and instruction information recording means for recording the received instruction information in the recording area. The composition ratio determining means determines the composition ratio based on the recorded instruction information, and the output means determines the total number of the plurality of types of repeat data stored in the storage means by the total information indicated by the instruction information. It is also possible to output at the output bit rate.

With this configuration, the operator of the local station
Since it is possible to instruct the composition ratio and transfer rate of each repeat data to be broadcast to the receiving device of the viewer at any time according to the situation, select the information that has a high need for the viewer according to the time of day and select the selected information. Provides detailed information services to viewers by giving priority to increasing the transfer frequency of the repeat data that composes, or by increasing the transfer rate of material data during times when the viewership rate of data broadcasting programs is high. can do.

Here, each of the repeat data is composed of a plurality of packet data transmitted by the carousel transmission method, the data stream is a transport stream, and each of the repeat data is different for each type of repeat data. Having a PID, the storage means
At least one set of a first PID for identifying the PID to be rewritten and a second PID for specifying the PID after the rewriting is stored, and the data output means stores the PID of each repeat data to be read. Determination means for determining whether or not any one of the first PIDs stored in the storage means matches, and in the case of matching, the read repeat data
A PID rewriting unit that rewrites the PID to a second PID that forms a pair with the first PID that matches the PID may be included.

With this configuration, the PID of the packet data of the specific repeat data can be rewritten to a predetermined PID and the packet data can be transferred. Therefore, the PID assigned to the packet data transmitted from the key station is already in the local area. It is possible to solve the problem when the station uses the PID as another type of packet data. In addition, the present invention provides a first-class data stream that includes a plurality of types of repeat data that are repeatedly transmitted and a second-class data stream that includes Null packet data that is dummy packet data that is not involved in playback display. A data transfer device for receiving repeat data from a lower station, the repeat data being composed of a plurality of repeat packet data, and the data transfer device for storing the plurality of types of repeat data. Storage means having a storage area; extraction means for extracting the plurality of types of repeat data from the received first type data stream; storage means for storing the extracted plurality of types of repeat data in the storage means; Detecting means for detecting Null packet data from the second type data stream Output data selection means for sequentially selecting the type of repeat data, and, when Null packet data is detected, the second type packet data stream received from the storage means for reading the repeat packet data constituting the repeat data of the sequentially selected type. In (1), the output means may replace the detected Null packet data and output it, and if it does not detect, output the received second type data stream as it is.

Further, each of the repeat data may be composed of a plurality of packet data transmitted by the carousel transmission method, and the first class and the second class data streams may be transport streams. Further, according to the present invention, a first type data stream including a plurality of types of repeat data that is repeatedly transmitted and Null that is dummy packet data that is not involved in reproduction / display.
A data transfer method in a data transfer device having a storage area for receiving a second type data stream including packet data from an upper station, transferring repeat data to a lower station, and storing the plurality of types of repeat data. Each of the repeat data is composed of a plurality of repeat packet data, and the data transfer method includes an extracting step of extracting the plurality of types of repeat data from the received first type data stream, and the plurality of extracted plurality of types. Storing the repeat data of the second type in the storage area, and Null from the received second type data stream.
A detection step of detecting packet data, an output data selection step of sequentially selecting the type of repeat data to be output, and a case of detecting Null packet data,
The Nu packet detected in the received second-kind packet data stream is read out from the storage means for the repeat packet data that constitutes the repeat data of the sequentially selected type.
It may be replaced with the ll packet data and output, and when not detected, an output step of directly outputting the received second type data stream.

The present invention also provides a first type data stream containing a plurality of types of repeat data that are repeatedly transmitted,
A second type data stream including Null packet data, which is dummy packet data not involved in reproduction display, is received from an upper station, repeat data is transferred to a lower station, and the plurality of types of repeat data are stored. A computer-readable recording medium recording a program used in a data transfer device having a storage area, wherein each of the repeat data is composed of a plurality of repeat packet data, and the program receives the first received data.
An extracting step of extracting the plurality of types of repeat data from the class data stream, a storing step of storing the extracted plurality of types of repeat data in the storage area, and detecting Null packet data from the received second type data stream Detecting step, an output data selecting step of sequentially selecting the type of repeat data to be output, and a case of detecting Null packet data, the repeat packet data forming the repeat data of the sequentially selected type is read from the storage means, The received second type packet data stream may be replaced with the detected Null packet data and output, and if not detected, an output step of directly outputting the received second type data stream may be included.

The present invention also provides a first type data stream containing a plurality of types of repeat data that are repeatedly transmitted,
A data transfer having a storage area for receiving a second type data stream including Null packet data that is dummy packet data not involved in reproduction display, transferring repeat data, and storing the plurality of types of repeat data. A program used for a device, wherein each of the repeat data is composed of a plurality of repeat packet data, the program, from the received first type data stream, an extraction step of extracting the plurality of types of repeat data, A storage step of storing the extracted plurality of types of repeat data in the storage area, a detection step of detecting Null packet data from the received second type data stream, and output data for sequentially selecting the type of repeat data to be output Select step and Nu
When the ll packet data is detected, the repeat packet data constituting the repeat data of the sequentially selected type is read from the storage means, and is replaced with the detected Null packet data in the received second type packet data stream and output. If not detected, an output step of directly outputting the received second type data stream may be included.

With this configuration, the Null packet data, which is the dummy packet data, is replaced with the packet data that constitutes the sequentially selected repeat data and the data is transferred. Therefore, it is possible to transfer the data without wasteful data transfer. The bandwidth can be effectively used to improve the data transmission efficiency. Here, the storage area is composed of respective allocated storage areas for storing the plurality of types of repeat data one by one, and the storage means corresponds to the repeat data each time the repeat data is extracted. The allocation storage area may be overwritten.

With this configuration, the amount of memory for storing the material data can be reduced, and the latest material data can be always stored, so that when the content of the material data is updated. Also, the material data having the updated contents can be transferred and provided to the viewer's receiving device. Here, the output data selection means, for each of the repeat data, a count means for counting the number of repeat packet data constituting the repeat data extracted per predetermined time, and the output data selection means, each of the repeat data It is also possible to sequentially select the type of repeat data to be output in accordance with the priority order determined based on the ratio of each count number among the types.

With this configuration, each repeat data can be transferred at the same composition ratio as the composition ratio of each repeat data transmitted from the key station, which causes a difference in the content of the material data between the key station and the local station. It is possible to provide a viewer with a data broadcast program of uniform content without causing the key station to have a composition ratio not intended by the key station side (for example, repeat data that constitutes a menu screen for the user to select a data broadcast program). It is possible to prevent the material data from being broadcast to the receiving device of the viewer when the composition ratio of (1) is extremely low.

Here, each of the repeat data is composed of a plurality of packet data transmitted by the carousel transmission method, the first and second class data streams are transport streams, and the second class data. The stream includes packet data having a plurality of PIDs including the first PID, the storage unit stores the second PID, and the detection unit further receives the packet data having the first PID from the received second type data stream. When detecting the first PID, the output unit may further read the second PID from the storage unit, rewrite the PID of the detected packet data into the read PID, and output the packet data.

With this configuration, a specific packet data
Since the PID can be rewritten to a predetermined PID and the packet data can be transferred, the PID given to the packet data transmitted from the key station has already been used by the local station as the PID for another type of packet data. It is possible to solve the problem when there is. The present invention is also a data transfer device for receiving a data stream containing repeat data repeatedly transmitted from an upper station and transferring the repeat data to a lower station, wherein the data transfer device stores one repeat data. Storage means for having a storage area for, from the received data stream, an extraction means for extracting the repeat data, the first extracted repeat data is stored in the storage area, each time the repeat data is newly extracted, A storage unit that overwrites the newly extracted repeat data in the storage area and an output unit that reads and outputs the repeat data stored in the storage unit may be provided.

Further, according to the present invention, a data stream including repeat data repeatedly transmitted is received from an upper station,
A data transfer device for transferring repeat data to a lower station, the content of the repeat data repeatedly transmitted,
Updated at a predetermined timing, the repeat data further includes update information indicating that the content has been updated, the data transfer device, a storage unit having a storage area for storing one of the repeat data, From the received data stream, an extracting unit that extracts repeat data, an update determining unit that determines whether the content is updated based on the update information included in the extracted repeat data, and the first extracted repeat data. Is stored in the storage area, and only when it is updated, a storage unit that replaces the extracted repeat data with the repeat data stored in the storage area and stores the same, and stores in the storage unit. An output means for reading and outputting the repeat data may be provided.

With this configuration, even when the data band that the local station can use is larger than the data band that the key station can use, each stored repeat data is read a necessary number of times according to the band difference, and the repeat data is read. Since you can adjust the speed at which data is repeatedly transmitted, you can transfer the received material data efficiently by making maximum use of the available data bandwidth, and reduce the amount of memory for storing the material data. can do.

Even when the data band available to the local station is smaller than the data band available to the key station, it is necessary to temporarily store a large amount of repeat data in the memory in order to adjust the transfer rate. Since it disappears, each repeat data can be transferred to the lower station without using a huge memory. Further, since the latest repeat data can be stored at all times, even when the content of the material data is updated, the material data with the updated content is transferred and provided to the receiving device of the viewer. be able to.

[Brief description of drawings]

FIG. 1 is a data transfer device 10 according to an embodiment of the present invention.
The structure of the main part of 0 is shown.

[Fig. 2] Broadcasting station sends DSM-CC (Digital Storage Me
dia Command and Control) is a diagram showing the format of material data transmitted by the carousel transmission method.

FIG. 3 is a diagram showing the relationship between packet data, sections, modules, carousels, and material data.

4 is a diagram schematically showing an example of a data structure of material data stored in a data storage unit 101. FIG.

FIG. 5 is a table showing an example of the number of input packet data for each module ID counted by the extracted data counting unit 103.

FIG. 6 is a table showing an example of a management information table.

FIG. 7 shows parameters used by the data composition ratio determination unit 104 to perform data composition ratio determination processing.

FIG. 8 is a PID held by the data composition ratio determination unit 104.
It is an example of a table showing the state of the multiple integration count.

FIG. 9 shows an example of a module multiplex integrated count table showing the state of the module multiplex integrated count held by the data structure ratio determination unit 104.

10 is a flowchart showing an output target section determination process performed by the data structure ratio determination unit 104. FIG.

FIG. 11: Step 1 performed by the data composition ratio determination unit 104
It is a flowchart which shows the content of the process in 007.

FIG. 12 shows a configuration of a main part of a data transfer device 200.

FIG. 13 shows an example of contents of an output bit rate information rate.

FIG. 14 shows a configuration of a main part of a data transfer device 300.

FIG. 15 is a table showing an example of instruction information.

16 shows a configuration of a main part of the data transfer device 400. FIG.

17 shows a configuration of a main part of the data transfer device 500. FIG.

FIG. 18 shows an example of a data stream of AV packet data received by the video data acquisition unit 507.

FIG. 19 shows a data output unit 505 in which the video data extraction unit 50 is provided.
7 shows an example of a data stream that receives and outputs AV packet data shown in FIG. 18 from FIG.

20 is a flowchart showing the operation of packet data selection processing performed by the data output unit 505. FIG.

FIG. 21 shows a configuration of a main part of the data transfer device 600.

FIG. 22 is a flowchart showing an operation of a data composition ratio determination process.

FIG. 23 is a flowchart showing the first half of the output target packet determination process performed by the data configuration ratio determination unit 104.

FIG. 24 is a flowchart showing the latter half of the output target packet determination processing performed by the data configuration ratio determination unit 104.

FIG. 25 is a flowchart showing a material packet data output process performed by the data output unit 105.

[Explanation of symbols]

100, 200, 300, 400, 500, 600
Data transfer device 101 Data storage unit 102 Data extraction unit 103 Extracted data count unit 104 Data composition ratio determination unit 105, 505, 605 Data output unit 106 Data output rate storage unit 203 Extracted data analysis unit 303 Data output rate instruction unit 306 Instruction information Storage unit 403 Instruction information analysis unit 507 Video data acquisition unit 508 Null packet detection unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Kagemoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Koichiro Yamaguchi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (21)

[Claims] 1. A data transfer device for receiving a data stream containing a plurality of types of repeat data that is repeatedly transmitted from an upper station and transferring the repeat data to a lower station, wherein the data transfer device stores a plurality of types of repeat data. Storage means having a storage area, extraction means for extracting each type of repeat data from a data stream received from a higher-order station, storage means for storing each extracted repeat data in the storage area, and output at fixed time intervals Data composition ratio determining means for determining a composition ratio between types of repeat data to be reproduced, and data output means for reading out each of the plurality of types of repeat data stored in the storage means and outputting the determined composition ratio. A data transfer device comprising: 2. The storage area is composed of respective allocated storage areas for storing the plurality of types of repeat data one by one, and the storage means stores the repeat data each time the repeat data is extracted. 2. The data transfer apparatus according to claim 1, wherein the corresponding allocation storage area is overwritten. 3. The repeat data of each of the plurality of types is composed of a plurality of packet data, and the data composition ratio determining means is a packet data forming the repeat data extracted for each predetermined time for each of the repeat data. 2. The data composition ratio determining means determines the composition ratio based on the ratio of each count number between the types of the repeat data. Data transfer device. 4. The data stream further includes output information data having output ratio information indicating a composition ratio between types of the respective repeat data to be output, and the extraction means further extracts the output information data, 2. The data transfer device according to claim 1, wherein the data composition ratio determining means determines the composition ratio based on the output ratio information included in the extracted output information data. 5. The output rate instruction information reception, wherein the output means receives an input of instruction information for instructing a total output bit rate and a composition ratio between types of repeat data in a data stream output in a fixed time. The data structure ratio determining means includes: instruction information storage means having a storage area for recording instruction information; and instruction information recording means for recording the received instruction information in the recording area. The data composition ratio determining unit determines the composition ratio based on the recorded instruction information, and the output unit outputs the plurality of types of repeat data stored in the storage unit to the instruction information. The data transfer device according to claim 1, wherein the data transfer device outputs at a total output bit rate. 6. The extraction means further includes: instruction information data having instruction information for instructing a composition ratio between types of repeat data to be output per fixed time and a total output bit rate. Further extract instruction information data from the data stream, the data composition ratio determination unit determines the composition ratio based on the instruction information included in the extracted instruction information data, the output unit, The plurality of types of repeat data stored in the storage means are output at the total output bit rate indicated by the instruction information. Claim 1 characterized by the above.
The described data transfer device. 7. The data transfer apparatus according to claim 1, wherein each of the repeat data is composed of a plurality of packet data transmitted by a carousel transmission method, and the data stream is a transport stream. 8. The repeat data has different PIDs for each type of repeat data, and the storage means includes a first PID for identifying a PID to be rewritten and a first PID for specifying a rewritten PID. 2PI
And storing at least one set with D, and the data output means is a determination means for determining whether or not the PID of each repeat data to be read matches any one of the first PIDs stored in the storage means. 8. The data transfer device according to claim 7, further comprising: PID rewriting means for rewriting the PID of the read repeat data to a second PID that forms a pair with the first PID that matches the PID when they match. 9. A first-class data stream including a plurality of types of repeat data that are repeatedly transmitted and a second-class data stream including Null packet data that is dummy packet data that is not involved in playback / display from a higher station. A data transfer device that receives and transfers repeat data to a lower station, wherein each repeat data is composed of a plurality of repeat packet data, and the data transfer device is for storing the plurality of types of repeat data. Storage means having a storage area; extraction means for extracting the plurality of types of repeat data from the received first type data stream; storage means for storing the extracted plurality of types of repeat data in the storage means; Detecting means for detecting Null packet data from the second type data stream, Output data selection means for sequentially selecting the type of repeat data to be reproduced, and, when Null packet data is detected, repeat packet data constituting repeat data of the sequentially selected type is read from the storage means and received A data transfer device, comprising: an output unit that replaces the detected Null packet data in the data stream and outputs the Null packet data, and if not, outputs the received second type data stream as it is. 10. The storage area is configured by respective allocation storage areas for storing the plurality of types of repeat data one by one, and the storage unit stores the repeat data each time the repeat data is extracted. 10. The data transfer apparatus according to claim 9, wherein the corresponding allocation storage area is overwritten. 11. The output data selecting means, for each of the repeat data, counting means for counting the number of repeat packet data constituting the repeat data extracted per predetermined time, and the output data selecting means, 10. The data transfer apparatus according to claim 9, wherein the types of repeat data to be output are sequentially selected in accordance with the priority order determined based on the ratio of each count number among the types of repeat data. 12. The repeat data is composed of a plurality of packet data transmitted by a carousel transmission method, and the first and second data streams are transport streams. 9. The data transfer device according to item 9. 13. The second type data stream is the first data stream.
Packet data having a plurality of PIDs including PIDs, the storage unit stores a second PID, the detection unit further detects packet data having a first PID from the received second type data stream, 13. The output means further reads the second PID from the storage means when the first PID is detected, rewrites the PID of the detected packet data with the read PID, and outputs the packet data. Data transfer device. 14. A data transfer device for receiving a data stream containing repeat data repeatedly transmitted from an upper station and transferring the repeat data to a lower station, the data transfer apparatus having a storage area for storing one repeat data. A storage unit, an extraction unit that extracts repeat data from the received data stream, and stores the first extracted repeat data in the storage area, and each time new repeat data is extracted, the newly extracted repeat data is stored. Storage means for overwriting the storage area, and reading the repeat data stored in the storage means,
A data transfer device comprising: an output unit for outputting. 15. A data transfer device that receives a data stream containing repeat data that is repeatedly transmitted from an upper station and transfers the repeat data to a lower station, wherein the content of the repeat data that is repeatedly transmitted has a predetermined value. Updated at the timing, the repeat data further,
The data transfer device includes update information indicating that the content has been updated, and the data transfer device includes a storage unit having a storage area for storing one of the repeat data, and an extracting unit for extracting the repeat data from the received data stream. And update determination means for determining whether or not the content is updated based on the update information included in the extracted repeat data, and the first extracted repeat data is stored in the storage area and updated. Only, storing means for replacing and storing the extracted repeat data with the repeat data stored in the storage area, and reading the repeat data stored in the storage means,
A data transfer device comprising: an output unit for outputting. 16. A data transfer having a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from an upper station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A data transfer method in a device, comprising: an extraction step of extracting each type of repeat data from a data stream received from a higher station; a storage step of storing each extracted repeat data in the storage area; A data composition ratio determining step of determining a composition ratio between types of repeat data to be output, and a data output step of reading each of the plurality of types of repeat data stored in the storage unit and outputting the determined composition ratio. And a data transfer method comprising: 17. A data transfer having a storage area for receiving a data stream containing a plurality of types of repeat data repeatedly transmitted from an upper station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A computer-readable recording medium for recording a program used in an apparatus, wherein the program comprises: an extracting step of extracting each type of repeat data from a data stream received from an upper station; and a step of extracting each of the extracted repeat data. A storage step of storing in a storage area, a data composition ratio determining step of determining a composition ratio between types of repeat data to be output per fixed time, and each of the plurality of types of repeat data stored in the storage means. A data output step of reading and outputting the determined component ratio. A computer-readable recording medium characterized in that. 18. A data transfer having a storage area for receiving a data stream including a plurality of types of repeat data repeatedly transmitted from a higher station, transferring the repeat data to a lower station, and storing a plurality of types of repeat data. A program used for the device, comprising: an extracting step of extracting each type of repeat data from a data stream received from a higher station; a storing step of storing each extracted repeat data in the storage area; A data composition ratio determining step of determining a composition ratio between types of repeat data to be output, and a data output step of reading each of the plurality of types of repeat data stored in the storage unit and outputting the determined composition ratio. A program characterized by including and. 19. A first-class data stream containing a plurality of types of repeat data that is repeatedly transmitted and a second-class data stream containing Null packet data that is dummy packet data that is not involved in playback display are sent from a higher station. Receiving, transferring repeat data to a lower station, a data transfer method in a data transfer device having a storage area for storing the plurality of types of repeat data, each repeat data, from a plurality of repeat packet data And a storage step of storing the extracted plurality of types of repeat data in the storage area, the extraction step of extracting the plurality of types of repeat data from the received first type data stream, Detect Null packet data from the received second type data stream A detection step, an output data selection step for sequentially selecting the type of repeat data to be output, and a case where Null packet data is detected, the repeat packet data forming the repeat data of the sequentially selected type is read from the storage means, And a step of outputting the received second-class packet data stream by replacing the detected Null packet data with the output, and outputting the received second-class data stream as it is when not detected. . 20. A first-class data stream including a plurality of types of repeat data that are repeatedly transmitted, and a second-class data stream including Null packet data that is dummy packet data that is not involved in playback / display from an upper station. A computer-readable recording medium for recording a program used in a data transfer device for receiving, transferring repeat data to a lower station, and having a storage area for storing the plurality of types of repeat data, wherein each repeat The data is composed of a plurality of repeat packet data, and the program includes an extracting step of extracting the plurality of types of repeat data from the received first type data stream, and the extracted plurality of types of repeat data in the storage area. The storing step for storing in the A detection step of detecting Null packet data from the ream, an output data selection step of sequentially selecting the type of repeat data to be output, and a repeat packet data forming the repeat data of the sequentially selected type when Null packet data is detected In the received second type packet data stream is replaced with the detected Null packet data and output, and when not detected, the received second type data stream is output as it is. A computer-readable recording medium characterized by. 21. A first type data stream including a plurality of types of repeat data that are repeatedly transmitted, and a second type data stream including Null packet data that is dummy packet data not involved in playback display are received.
A program used for a data transfer device that transfers repeat data and has a storage area for storing the plurality of types of repeat data, wherein each of the repeat data is composed of a plurality of repeat packet data, and the program is An extracting step of extracting the plurality of types of repeat data from the received first type data stream; a storing step of storing the extracted plurality of types of repeat data in the storage area; and a receiving step of receiving the second type data stream A detection step of detecting Null packet data, an output data selection step of sequentially selecting the type of repeat data to be output, and a case of detecting Null packet data, the repeat packet data constituting the repeat data of the sequentially selected type is described above. Read from storage means, receive The received second type packet data stream is replaced with the detected Null packet data and output, and when not detected, the output step of outputting the received second type data stream as it is.