JPH1022950A - Information delivery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize efficient and latest data updating with less data transmission quantity by adding a patch where an update position and the mutual dependence relation of patches are mentioned to a patch to be transmitted. SOLUTION: When updating data is inputted from an updating data input part 11, an updating difference generation part 12 reads data before updating from a pre-updating data storage part 13 and generates the patch by taking the difference with updating data. Updated data in the generated patch is transmitted to a transmission part 16 and an address is transmitted to an updating header generation part 14. The updating is header generation part 14 compares the address of the transmitted patch with all addresses accumulated in an updating information storage part 15. A header where the mutual dependence relation of them is mentioned is generated and is transmitted to the transmission part 16. The transmission part 16 adds the header to update data from the updating difference generation part 12 and transmits it to a radio transmission line 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information delivery apparatus for delivering data through a television broadcast using a broadcast satellite or a terrestrial broadcast.

[0002]

2. Description of the Related Art News such as newspapers and magazines, daily life information, and the like are distributed to each home through a television broadcast, stored in a receiving terminal in each home, and reproduced and used on a television screen when necessary. Delivery devices are known. Such a data distribution system based on television broadcasting is suitable for efficiently transmitting information to many distribution destinations at once, but it is necessary to frequently transmit update data depending on the type or content of information. In addition, the data to be delivered includes moving images, texts, still images, control information, and the like. Since the data amount is considerably large, all of the data cannot be stored in the receiving terminal, and the stored data is discarded. And updates are often needed.

For example, in a UNIX environment compatible with a network, a patch is obtained by taking a difference between a new and an old source file in a program source code and transmitting the patch to reduce a transmission data amount. Normally, one version is assigned to one patch and version control is performed. And diff-arc
The version is upgraded by inserting the patch acquired in S1 and S2 with the patch command.

[0004]

However, in the conventional patch technology on a network, all patches are sent in a predetermined order, and it is necessary for the receiving side to receive them in the predetermined order. Therefore, this cannot be applied to a system that cannot always receive in order, such as a television broadcast. In the data distribution by TV broadcasting, the reception state changes greatly due to uncertain factors due to the weather such as rain and thunder, and not all data can be completely received. By reconstructing this on the receiving side, correct data is restored. For this reason, even if the patches are transmitted in the determined order, the receiving side cannot receive the patches in the determined order, so that a new patch may be updated by an old patch.

[0005] Further, in the conventional data distribution using television broadcasting, re-broadcasting is performed a plurality of times on the assumption that an error occurs due to weather conditions or the like. However, there has been a problem that the same error continues many times and correct data cannot be obtained on the receiving side.

An object of the present invention is to solve such a conventional problem, and it is an object of the present invention to provide an information delivery apparatus which can obtain correct data on a receiving side in data delivery using a television broadcast. .

[0007]

According to the present invention, in order to achieve the above object, a patch to be transmitted is transmitted with a header describing an update position and a dependency between the patches. Dependencies between patches indicate the degree of overlap and order between patches to be transmitted and patches already transmitted, and by attaching this to the header, even if patches are received with a time lag, The data can be correctly reconstructed at the receiving side, and new patches can be prevented from being updated by old patches.

According to the present invention, when data is delivered, the number of retransmissions and an error correction method are changed based on a communication state such as weather. As a result, it is possible to select an optimal communication method according to the communication state at that time,
Data reliability can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, in an information delivery apparatus for delivering data using a broadcast, when an attempt is made to update already sent data, data of an updated portion is transmitted. An information delivery device comprising: means for creating a patch; and means for sending the created patch with a header describing the update position and the interdependency between the patches. Since the applicable procedure is attached to the header and transmitted, even if all the transmitted patches cannot be received correctly in chronological order, by using the received patches to the maximum, it is possible to efficiently use a small amount of data transmission It can be updated to the latest data. In addition, since each receiving terminal autonomously performs such an updating operation, rapid data updating can be performed according to the situation where the receiving terminal is placed.

According to a second aspect of the present invention, in an information delivery apparatus for delivering data using a broadcast, when updating already sent data, data of an updated portion is created as a patch. 2. An information delivery apparatus comprising: means, means for transmitting a created patch with a header describing an update position and mutual dependency between patches, and means for temporarily storing a received patch; In addition to the effects of the invention described above, even when the data to be applied with the received patch has not been received yet due to an error or the like, the patch is temporarily stored and applied after the data to be applied is received. Thus, data can be updated efficiently.

According to a third aspect of the present invention, in an information delivery apparatus for delivering data using a broadcast, when updating already sent data, data of an updated portion is created as a patch. Means, when the created patch partially overlaps with the already sent patch, means for incorporating the data portion of the already sent patch excluding the overlapping portion into the newly created patch, and And a means for transmitting a message with a header describing the dependency of the patch, wherein the patch is created by taking in a previous patch having the dependency.
Or, although the data amount is larger than the invention described in 2,
Since the received patch contains the contents of the previous patch, the data can be updated efficiently without waiting for the reception of the patch.

According to a fourth aspect of the present invention, there is provided the information delivery apparatus according to any one of the first to third aspects, wherein a patch to be transmitted is created for each block classified for each type of information. Patches can be managed for each type of information.

According to a fifth aspect of the present invention, there is provided an information delivery apparatus for transmitting and receiving data using a broadcast,
The transmitting device is an information delivery device including a means for inputting a communication state and a means for selecting an optimal communication method based on the input communication state, and switching to a communication method suitable for the communication state at that time. Accordingly, it is possible to realize a highly reliable information delivery device that is hardly affected by the weather and the like.

According to a sixth aspect of the present invention, there is provided an information delivery apparatus for transmitting and receiving data using a broadcast,
A state monitoring device installed in each region for monitoring the communication state and transmitting the information to the transmitting device, and a transmitting device for selecting an optimal communication method based on the information on the communication state obtained from the state monitoring device. It is an information delivery device equipped, based on information from condition monitoring devices installed in various places, by automatically switching to a communication method suitable for the communication state at that time,
A highly reliable information delivery device that is not easily affected by the weather or the like can be realized.

According to a seventh aspect of the present invention, there is provided an information delivery apparatus for transmitting and receiving data using a broadcast,
A receiving device that monitors a communication state and sends the information to a transmitting device, and an information delivery device including a transmitting device that selects an optimal communication method based on information on the communication state obtained from the receiving device, By automatically switching to a communication method suitable for the communication state at that time based on information from each receiving device, it is possible to realize a reliable and low-cost information delivery device that is not easily affected by weather and the like. it can.

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the information delivery device according to the first embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a transmission device, reference numeral 20 denotes a radio transmission path, and reference numeral 30 denotes a reception device. The transmission device 10 transmits data to the reception device 30 through a radio transmission path 20 for television broadcasting using satellites or terrestrial waves. Send. In the transmission device 10, 11 is an update data input unit, 12 is an update difference creation unit, 13 is a pre-update data storage unit, 14 is an update header creation unit, 15 is an update information storage unit, and 16 is a transmission unit. In the receiving device 30, 31 is a receiving unit, 32 is an update control unit,
33 is an update history storage unit, 34 is an update unit, and 34 is a data storage unit.

Next, the operation of this embodiment will be described. In FIG. 1, when update data is input from an update data input unit 11, an update difference creation unit 12 reads data before update from a pre-update data storage unit 13 and creates a patch by obtaining a difference from the update data. I do. This patch is composed of an address indicating the start and end positions of the part to be updated and data indicating the contents of the update. The address may be simply indicated by a bit number indicating the size from a bit number to a bit number, or as shown in FIG. 2, a block number obtained by classifying data by type. In FIG. 2, block numbers 1 to 2 are bibliographic data, 2 to 3 are character data, 3 to 5 are video data, and 5 to 6 are audio data. Or
Even if the data type is the same (content)
The data may be divided into smaller pieces for each.

The update data among the patches created by the update difference creation unit 12 is sent to the transmission unit 16, and the address is sent to the update header creation unit 14. Update header creation unit 14
Then, the address of the transmitted patch is compared with the addresses of all the patches so far stored in the update information storage unit 15, and a header describing their mutual dependency is created and transmitted to the transmission unit 16. send. The transmission unit 16 attaches a header to the update data from the update difference creation unit 12 and transmits the update data to the wireless transmission path 20.

FIG. 3A illustrates a procedure for creating a patch in the update difference creating section 12. A0 is data before update, and A1 is data for updating the 100th to 200th data of the data A0. A2 is data for updating the 120th to 150th data of the data A0. A3 is data for updating the 300th to 400th data of the data A0. A4 is data for updating the 80th to 170th data of the data A0. On the other hand, the patch P1 is a patch for the data A1, the patch P2 is a patch for the data A2, the patch P3 is a patch for the data A3, the patch P4 is a patch for the data A4, It consists of an address indicating the end position and update data.

FIG. 4 shows a processing procedure in the update header creating unit 14. First, the patch to be newly sent is P
n (Step S1). Next, the update information storage unit 15
It is determined whether or not a patch has been stored in the
2) If the patches have been accumulated, the patches are sequentially extracted (step S3), and the extracted patches are set to P '. Next, it is determined whether or not the transmission patch Pn includes (including the same as) the existing patch P ′ (step S4). If not, it is determined whether or not Pn overlaps P '(step S6). If they overlap, P' is regarded as an essential patch, and if not, P 'is regarded as an independent patch (step S8).
These processes are performed on all patches stored in the update information storage unit 15.

The above processing will be described with reference to FIG. Assume that the patch to be transmitted is P4. Since the patch P4 includes the patch P2, the patch P2 becomes the included patch of the patch P4. Since the patch P4 partially overlaps the patch P1, the patch P1 is an essential patch of the patch P4. Since the patch P3 has neither inclusion nor overlap, it is an independent patch. The essential patch is a patch that must be applied before the transmission patch because there is data that partially overlaps the transmission patch but is not included in the transmission patch. Since the included patches are all included in the transmission patch, they are unnecessary patches when the original data is updated with the transmission patch.Therefore, it is not necessary to apply it before the transmission patch. Must be done in front. Therefore, by assigning such information indicating the dependency relationship between the required patches and the included patches to the header as shown in FIG. 3B, the receiving side of the transmission patch can understand the procedure of the patch processing. Will be.

FIG. 3B shows a data structure of a patch transmitted from the transmitting section 16 when the patch 4 is to be transmitted. The transmission patch includes a header section 101 and a data body section 102, and the header section 101 includes the transmission patch 1
01a, essential patches 101b, and inclusion patches 101c. The receiving unit 31 of the receiving apparatus 30 that has received such a patch first decomposes the header unit 101 and the data main unit 102, passes the data main unit 102 to the update unit 34, and passes the header unit 101 to the update control unit 32. hand over.

FIG. 5 shows a processing procedure in the update control unit 32. First, the received patch is set to Pn (step S11). Next, it is checked whether or not the patch Pn has already been applied based on the information from the update history storage unit 33 which sequentially stores which patch has been applied to which patch (step 12). If it has not been applied, it is checked whether or not the essential patch has already been applied (step S13). If it has already been assigned, an instruction to assign Pn thereto is output to the updating unit 34 (step S14).
Next, when a chronologically old included patch created before Pn comes, an instruction is issued to the updating unit 34 so as not to apply it (step S15). Upon receiving these instructions, the updating unit 34 executes the instructions on the data body received from the receiving unit 31 to complete the update.

The above processing will be described with reference to the example of FIG. 3. In the data of the patch P4 received by the receiver 31, the header 1
01 is sent to the update control unit 32, and the update control unit 32
It is checked whether the patch P4 has already been applied by looking into the update history storage unit 33. This is because data broadcasting is premised on retransmission. If the patch P4 has not been applied yet, whether or not the essential patch P1 has been applied is similarly examined by looking into the update history storage unit 33. If the mandatory patch P1 has already been applied, the patch P
Since 4 can be assigned, the instruction is issued to the updating unit 34. If the patch P4 is applied, it is not necessary to apply the included patch P2 older than the patch P4.
Put in 4. The updating unit 34 executes the command, updates the corresponding portion of the data A0 stored in the data storage unit 35, and stores the updated portion in the data storage unit 35 again.

As described above, according to the first embodiment, when transmitting a patch, the receiving side attaches a header describing a procedure for applying a patch, and transmits the patch. Even if the data cannot be received correctly in a sequence, the data can be updated with only some of the received patches, and the data can be updated efficiently with a small data transmission amount.

(Embodiment 2) FIG. 6 shows the configuration of an information delivery apparatus according to a second embodiment of the present invention. It differs from the first embodiment shown in FIG. 1 only in the configuration of the receiving device 30A, and has a configuration in which an update difference storage unit 36 is added to the receiving device 30 in FIG. When the update patch is not applied to the required patch by the update control unit 32, the update difference storage unit 36 discards the transmitted patch as it is in the configuration of FIG. 1 and repeats the same process when the next transmitted patch is received. In the present embodiment, if the transmission patch cannot be applied to the essential patch, the update difference storage unit 36 does not discard the transmission patch.
When the transmission patch can be applied to the essential patch, the transmission patch is extracted from the update difference storage unit 36 and applied.

As described above, according to the second embodiment, in addition to the effect of the first embodiment, even when data to be applied with a received patch has not been received due to an error or the like, the patch is temporarily stored. It is possible to efficiently update data by storing the data and receiving it after receiving the target data.

(Embodiment 3) FIG. 7 shows the configuration of an information delivery apparatus according to a third embodiment of the present invention. The only difference from the first embodiment shown in FIG. 1 is the configuration of the transmission device 40. In the transmitting device 40, 41
Is an update data input section, 42 is an update difference creation section, 43 is a pre-update data storage section, 44 is an update header creation section, 45 is an update difference synthesis section, 46 is an update information storage section, and 47 is a transmission section. The configuration is such that an update difference synthesis unit 45 is added to one transmission device 10. The receiving device 50 is the same as the receiving device 30 in FIG. 1; 51 is a receiving unit, 52 is an update control unit, 53 is an update history storage unit, 54 is an update unit, and 54 is a data storage unit. Update difference combining unit 45 of transmitting device 40
Is to create a patch including the already-sent patch when there is a portion where the transmitted patch created by the update difference creating unit 42 overlaps the already-sent patch. The difference from the first embodiment is that, when there is an essential patch, the essential patch is included in the transmission patch, that is, synthesized and transmitted. There is an advantage that no hit processing is required.

FIG. 8A illustrates a procedure for creating a patch. A0 is data before update, and A1 is data for updating the 100th to 200th data of the data A0. A2 is data for updating the 120th to 150th data of the data A0. A3 is data for updating the 300th to 400th data of the data A0. A4 is originally data for updating the 80th to 170th data of the data A0, but is data to which a difference from the data A1 is added, and is synthesized by the update difference synthesizing unit 55. In contrast, patch P
1 is a patch for data A1, patch P2 is a patch for data A2, and patch P3 is a patch for data A1.
3, and patch P4 is a patch for data A4, and is composed of an address indicating the start and end positions of the update portion and update data.

FIG. 9 shows a processing procedure in the update header creating section 44 and the update difference synthesizing section 55. First, a patch to be newly sent is set to Pn (step S2).
1). Next, it is determined whether or not patches are stored in the update information storage unit 46 (step S22). If the patches are stored, the patches are sequentially taken out (step S2).
3) The extracted patch is defined as P '. Next, it is determined whether or not the transmission patch Pn includes the existing patch P ′ (step S24). If the transmission patch Pn includes the existing patch P ′, the P ′ is determined to be the inclusion patch (step S25). Is determined (step S26), and if they overlap, the difference from P ', that is, the data portion of P' that does not overlap with Pn is added to Pn to form an inclusion patch (step S2).
7) If not overlapping, P ′ is set as an independent patch (step S28). These processes are performed on all patches stored in the update information storage unit 15.

FIG. 8B shows a data structure transmitted from the transmitting section 47 when transmitting the patch P4. That is, the transmission patch data is stored in the header 201
And a data body 202. The header 201 includes a transmission patch 201a and an inclusion patch 201b. The receiving unit 51 of the receiving device 50 that has received such data,
First, the header section 201 and the data body section 202 are disassembled and the data body section 202 is passed to the updating section 54, and the header section 20
1 to the update control unit 52. In this embodiment, since the patch P1 is added to the included patch when the patch P4 is created, it is described in the included patch 201b of the header section 201 together with the original included patch P2.

FIG. 10 shows a processing procedure in the update control unit 52. First, the received patch is set to Pn (step S31). Next, an update history storage unit 53 that sequentially stores which patch has been applied to which patch so far.
It is determined whether or not the patch Pn has been applied based on the information from (step 32).
An instruction to apply the patch Pn thereto is output to the updating unit 54 (Step S33). Next, when a chronologically old included patch created before Pn comes, an instruction is issued to the updating unit 54 so as not to apply it (step S34).
Upon receiving these instructions, the updating unit 54 executes the instructions on the data body received from the receiving unit 51 to complete the update.

As described above, according to the third embodiment, when a patch is transmitted, if a part overlaps with the already-transmitted patch, the non-overlapping part is taken into a new patch to create the patch. Although the amount of data is slightly increased, a new patch cannot be applied until a required patch can be received on the receiving side, and data can be updated efficiently.

(Embodiment 4) FIG. 11 shows the configuration of an information delivery apparatus according to a fourth embodiment of the present invention.
In FIG. 11, reference numeral 60 denotes a transmitting device, and 70 denotes a receiving device, which are connected via the wireless transmission path 20. In the transmission device 60, 61 is a communication state input unit, 62 is a transmission method control unit, 63 is a transmission method storage unit, 64 is a transmission unit, and 65 is a transmission data storage unit. In the receiving device 70, 71
Is a receiving unit, and 72 is a data storage unit. Other parts not shown are the same as those in FIG. 1, FIG. 6 or FIG.

In the present embodiment, data as shown in FIG. That is, when the weather condition is rainy, the fire code system is adopted as the communication system, the number of retransmissions is increased or the time between retransmissions is extended as the retransmission system, and the previously set delivery plan 2 is used as the delivery plan. Is defined as a set. If there is radio noise in the communication state, a random error correction code is adopted as the communication method, the retransmission method is continuously performed, and the delivery plan 1 is used as the delivery plan.
Is defined as a set. In the delivery plan 1, as shown in FIG. 13A, the number of delivery blocks is temporally continuous, and the error correction function for radio noise is strengthened by sending the blocks at a stretch.
As shown in (b), the number of distribution blocks is temporally dispersed and transmitted in small divisions to enhance the error correction function for bulk noise. Therefore, when rainy weather is input as the communication state from the communication state input unit 61, the communication method control unit 62
From the case of rainy weather and send it to the transmitting unit 64,
The transmitting unit 64 reads out the transmission data from the transmission data storage unit 65 and transmits the data to the wireless transmission path 20. The receiving device 70
The data received by the receiving unit 71 is stored in the data storage unit 72.

As described above, according to the present embodiment, when the operator directly inputs communication status information from the communication status input unit 61 of the transmission device 61, the transmission mode control unit 62
However, since a transmission method corresponding to the transmission method is selected from the transmission method storage unit 63, the communication situation is optimized, the error correction function is strengthened, and the reliability of distribution is improved.

(Embodiment 5) FIG. 14 shows the configuration of an information delivery apparatus according to a fifth embodiment of the present invention.
Other parts not shown are the same as those in FIG. 1, FIG. 6 or FIG. 14, reference numeral 70 denotes the same receiving device as in FIG. 11, 80 denotes a state monitoring device having a state monitoring unit 81, 9
Reference numeral 0 denotes a transmitting device connected to the receiving device 70 and the state monitoring device 80 via the wireless transmission path 20. In the transmission device 90, 91 is a communication status input unit, 92 is a transmission method control unit, 93 is a transmission method storage unit, 94 is a transmission unit, and 95 is a transmission data storage unit, which is almost the same as the transmission device 60 in FIG. However, the only difference is that the communication status input unit 91 is connected to the status monitoring unit 81 of the status monitoring device 80 via the wireless transmission path 20. The condition monitoring device 80 is a reception condition monitoring monitor, a weather observing device such as AMeDAS, a thundercloud radar, an unnecessary electromagnetic wave radiation measuring device, and the like, and is installed in each main or each region. The state monitoring unit 81 outputs the weather information of the place, receives the distribution information, and outputs the statistical information of the frequency of occurrence of various errors at the time of reception.

In the present embodiment, the communication state is transmitted to the transmitting device 9.
Since the transmission method control unit 92 selects information from the transmission method storage unit 93 using the information automatically sent from the state monitoring device 80 instead of directly inputting from 0, The communication status is automatically optimized, the error correction function is enhanced, and the reliability of distribution is improved.

(Embodiment 6) FIG. 15 shows a configuration of an information delivery apparatus according to a sixth embodiment of the present invention.
Other parts not shown are the same as those in FIG. 1, FIG. 6 or FIG. In FIG. 15, reference numeral 90 denotes the same transmission device as in FIG. 14, and reference numeral 100 denotes a reception device connected to the transmission device 90 via the wireless transmission path 20. The receiving device 100 includes a receiving unit 101 connected to a communication state input unit 91 of the transmitting device 90 via a wired transmission line 110 such as a telephone line or a dedicated line, and a data storage unit 102. The receiving unit 101 aggregates the error statistical information of the reception result and inputs the error statistical information to the communication state input unit 91 of the transmitting device 90 via the wired transmission line 110.

In this embodiment, the receiving section 101 of the receiving apparatus 100 detects the communication state from the received data, inputs the information to the communication state input section 91 of the transmitting apparatus 90 via the wired transmission line 110, and transmits the information. Since the system control unit 92 selects a transmission system corresponding to the transmission system from the transmission system storage unit 93, the communication status is automatically optimized, the error correction function is strengthened, and the reliability of distribution is improved with a simple system. be able to.

[0041]

As described above, according to the present invention, the patch to be transmitted is provided with the header describing the update position and the interdependency between the patches, so that all the transmitted patches are time-series. Even if the data cannot be received correctly, the latest data can be efficiently updated with a small amount of data transmission by maximizing the use of the received patches. In addition, since each receiving terminal autonomously performs such an updating operation, quick data updating can be performed according to the situation where the receiving terminal is placed.

According to the present invention, when data is delivered, the number of retransmissions and the error correction method are changed based on the communication state such as weather, so that the optimum communication method according to the communication state at that time is changed. Can be selected, and the reliability of the data can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an information delivery device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of data division in each embodiment of the present invention.

FIG. 3A is a schematic diagram illustrating a relationship between update data and a patch according to the first embodiment of the present invention. FIG. 3B is a data structure diagram of a patch according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of an update header creating unit according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of an update control unit according to the first embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration of an information delivery device according to a second embodiment of the present invention.

FIG. 7 is a block diagram illustrating a configuration of an information delivery device according to a third embodiment of the present invention.

FIG. 8A is a schematic diagram illustrating a relationship between update data and a patch according to the third embodiment of the present invention. FIG. 8B is a data structure diagram of a patch according to the third embodiment of the present invention.

FIG. 9 is a flowchart showing operations of an update header creating unit and an update difference combining unit according to the third embodiment of the present invention.

FIG. 10 is a flowchart showing the operation of the update control unit according to the third embodiment of the present invention.

FIG. 11 is a block diagram illustrating a configuration of an information delivery device according to a fourth embodiment of the present invention.

FIG. 12 is a list showing an example of contents in a transmission method storage unit according to Embodiments 4, 5, and 6 of the present invention.

13 (a) and (b) Embodiments 4, 5, and 6 of the present invention.
Schematic diagram showing an example of a delivery plan in Japan

FIG. 14 is a block diagram illustrating a configuration of an information delivery device according to a fifth embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of an information delivery device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 10, 40, 60, 90 Transmitting device 20 Wireless transmission line 30, 30A, 50, 70, 100 Receiving device 80 Status monitoring device 110 Wired transmission line 11, 41 Update data input unit 12, 42 Update difference creation unit 13, 43 Update Previous data storage unit 14, 44 Update header creation unit 15, 46 Update information storage unit 16, 47 Transmission unit 45 Update difference synthesis unit 21, 51 Receiving unit 22, 52 Update control unit 23, 53 Update history storage unit 24, 54 Update Unit 25, 55 Data storage unit 61, 91 Communication status input unit 62, 92 Transmission method control unit 63, 93 Transmission method storage unit 64, 94 Transmission unit 65, 95 Transmission data storage unit 71, 101 Receiving unit 72, 102 Data storage Department

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiyasu Takeuchi 1006 Odakadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Kenichi Fujita 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. An information delivery device for delivering data by using a broadcast, wherein when an attempt is made to update already sent data, means for creating data of an updated portion as a patch,
Means for transmitting the created patch with a header describing the update position and the dependency between the patches, and transmitting the patch. 2. An information delivery apparatus for delivering data by using a broadcast, wherein when updating already sent data, means for creating data of an updated portion as a patch,
An information delivery device comprising: means for transmitting a created patch with a header describing an update position and a dependency between patches; and means for temporarily storing a received patch. 3. An information delivery apparatus for delivering data using a broadcast, wherein, when updating already sent data, means for creating data of an updated portion as a patch,
If the created patch partially overlaps the already sent patch,
Information including means for capturing the data portion of the already-transmitted patch excluding the overlapping portion in a newly created patch, and means for transmitting the created patch with a header describing the update position and the dependency between patches, Delivery device. 4. The information delivery apparatus according to claim 1, wherein a patch to be transmitted is created for each block classified for each type of information. 5. An information delivery apparatus for delivering data by using a broadcast, wherein the transmitting apparatus includes means for inputting a communication state and means for selecting an optimum communication method based on the input communication state. Information delivery device provided. 6. An information distribution apparatus for distributing data by using a broadcast, comprising: a state monitor installed in each area for monitoring a communication state and transmitting the information to a transmitter; And a transmission device for selecting an optimum communication method based on the information on the communication state obtained. 7. An information delivery apparatus for distributing data using broadcast, comprising: a receiving apparatus for monitoring a communication state and transmitting the information to a transmitting apparatus; and a communication apparatus based on the communication state information obtained from the receiving apparatus. And a transmission device for selecting an optimal communication method.