JP5858949B2 - Data transmission system and data transmission method - Google Patents

Description

  Embodiments described herein relate generally to a data transmission system and a data transmission method.

  In general, there is a limit to the amount of data transmitted by the network, and attempting to transmit data beyond this limit will lead to network failure such as significant delay. For this reason, the network is required to make the data to be transmitted as small as possible.

  Therefore, conventionally, a method has been proposed in which data compression is performed by coding input data using block coding, Huffman coding, vector quantization, or the like.

JP-A-2-29296 JP 2010-283460 A

  However, in the conventional data transmission method, it is necessary to previously hold the same data design document for transmission data on the transmission side and the reception side. However, if the contents of the data design document are changed on either the transmission side or the reception side, there is a problem that the input data compressed on the transmission side cannot be expanded (decompressed) on the reception side.

  On the other hand, a method of putting a data design document on transmission data is also conceivable. However, if the data design document is placed on the transmission data, not only the amount of communication increases, but also the data receiving side needs to interpret the data design document. For example, in the case of an application program for displaying data, in order to display data, the data design document must be interpreted after reception, which causes a problem that the program contents become complicated.

  Therefore, in view of the above-described problems of the prior art, the present invention provides a data transmission system and data that can transmit and receive transmission data even when the transmission side and the reception side do not hold the same data design document for transmission data in advance. It is an object to provide a transmission method.

Data transmission system according to an embodiment of the present invention, input data compression and decompression first data compression and expansion apparatus capable of executing each and a second data compression and decompression device is connected via a network data transmission system The first data compression / decompression apparatus sets, for each data ID for identifying input data, a minimum value and a maximum value that the input data can take, and a value that the input data can take between the minimum value and the maximum value. a first storage unit for storing definition information that associates the precision representing the distance as the first data design document, the minimum value from the value of the input data for each data ID based on the definition information of the first data design document was divided by precision value obtained by subtracting a first code calculator for calculating a code according to the input data for each data ID, codes the code calculating unit is calculated for each data ID, the same Compressing the input data for each data ID based on the number a is the number of elements and definition information of the first data design document input data to be transmitted and received simultaneously for over data ID, and the compressed data according to all input data to the network and a data compression unit for outputting, and second data compression and decompression apparatus, each data ID, minimum, maximum, and associates the precision and the first data design document A second storage unit that stores, as a second data design document , definition information in which at least a part of the data ID is common, and the compressed data is analyzed based on the definition information of the second data design document , and the input data a second code calculator for calculating the number of elements and codes for each data ID according to a code a second code calculating unit is calculated for each data ID, the number of elements and the definition information of the second data design document Zui it comprises adding the minimum value to a value obtained by multiplying the accuracy code, a data decompression unit for obtaining the input data according to a common data ID, and.

Data transmission method according to an embodiment of the present invention, the compression and decompression of the input data when the executable first data decompression device and a second data compression and decompression device respectively are connected via a network , the first data compression and decompression apparatus, for each data ID for identifying the input data, representative of the interval of the input data possible values between the maximum and minimum and maximum values that can take the input data, and the minimum value a first storing step of storing definition information that associates the precision as the first data design document, the first data compression and decompression device, the input for each data ID based on the definition information of the first data design document the value obtained by subtracting the minimum value from the value of the data is divided by precision, and the first code calculation step of calculating a code according to the input data for each data ID, the first data compression and decompression device, the Code Code computed for each data ID in the operation step, the input data for each data ID based on a number of elements and the first data design document definition information the number of input data to be simultaneously transmitted and received for the same data ID compressed, and all data compression step of outputting the compressed data to the network according to the input data, the second data compression and decompression device, associated with each data ID, minimum, maximum, and the accuracy, and A second storage step for preliminarily storing, as a second data design document , definition information having at least a part of the data ID shared with the first data design document , and a second data compression / decompression apparatus comprising: the compressed data is analyzed based on the definition information of the second data design document, the second code calculation stearate for calculating the number of elements and codes according to the input data for each data ID A flop, a second data compression and decompression device, a second code calculation step code computed for each data ID in, based on the number of elements and the definition information of the second data design documents, multiplied by the accuracy in the code value And a data decompression step for obtaining input data related to the common data ID.

1 is a block diagram showing an example of the overall configuration of a data transmission system according to an embodiment of the present invention. The figure which shows the specific example of the 1st data design document which the 1st data compression / decompression apparatus shown in FIG. 1 memorize | stores. The figure which shows the specific example of the 2nd data design document which the 2nd data compression / decompression apparatus shown in FIG. 1 memorize | stores. 6 is a flowchart showing a specific example of data compression processing in the first data compression / decompression apparatus shown in FIG. 1. The figure which shows the specific example of the data compression process based on the 1st data design document shown in FIG. 7 is a flowchart showing a specific example of data decompression processing in the second data compression / decompression apparatus shown in FIG. 1. The figure which shows the specific example of the data expansion | extension process based on the 2nd data design document shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an example of the overall configuration of a data transmission system according to an embodiment of the present invention. As shown in the figure, the data transmission system is configured by connecting a first data compression / decompression apparatus 10 to a second data compression / decompression apparatus 20 via a network NW.

  The first data compression / decompression apparatus 10 includes a communication unit 11, a storage unit 12, a control unit 13, a display unit 14, an input unit 15, a timer 16, and a buffer 17.

  The communication unit 11 is a communication device that performs communication with the network NW. The storage unit 12 is a large-capacity storage device that accumulates programs and data, and is, for example, a hard disk device. FIG. 2 is a diagram showing a specific example of the first data design document stored in the storage unit 12 of the first data compression / decompression apparatus 10 shown in FIG. As shown in FIG. 2, in the storage unit 12, the data ID, the maximum number of elements representing the maximum number of elements (data) that can be simultaneously transmitted and received for each data ID, and the minimum value (min ), Maximum value (max), accuracy, and data representing the correspondence relationship of the number of patterns (radix) that can be taken by the input data from the minimum value to the maximum value. The precision indicates information indicating how many steps are taken between the minimum value (min) and the maximum value (max).

  The control unit 13 is a processing device such as a CPU that executes various arithmetic processes using programs, data, and the like stored in the storage unit 12 and the buffer 17. In FIG. 1, a code calculation unit 131, a data compression unit 132, and a data expansion unit 133 are illustrated as programs executed by the control unit 13.

  When the data compression processing is performed on the first data compression / decompression apparatus 10 side, the code calculation unit 131 takes in and analyzes the input data held in the buffer 17 and stores the first data stored in the storage unit 12. The code of the input data is calculated with reference to the design document. This code is an integer value from 0 to radix-1, which can be calculated by (input data-minimum value) / accuracy.

  The data compression unit 132 compresses the input data for each data ID based on the code calculated by the code calculation unit 131, the number of elements of the input data, and the definition information of the first data design document, and compresses all input data Data is output to the network NW.

  The display unit 14 is a device that displays a calculation result, a creation screen, and the like to the user, such as a liquid crystal display, a plasma display, or a CRT. The input unit 15 is a device that processes input from the user, and is, for example, a keyboard or a mouse. The buffer 17 is a main storage device such as a RAM for storing a program executed by the program and data necessary for executing each program, and can be read and written at high speed.

  Similarly, the second data compression / decompression apparatus 20 includes a communication unit 21, a storage unit 22, a control unit 23, a display unit 24, an input unit 25, a timer 26, and a buffer 27. Although different reference numerals are given in FIG. 1, the function of each part of the second data compression / decompression apparatus 20 is assumed to be common to the function of each part of the first data compression / decompression apparatus 10. The difference between the first data compression / decompression apparatus 10 and the second data compression / decompression apparatus 20 is only the version of the data design document stored in each of the storage units 12 and 22.

  When data decompression processing is performed on the second data compression / decompression apparatus 20 side, the code computation unit 231 analyzes the compressed data based on the second data design document stored in the storage unit 12 and relates to the input data. The number of elements and the code are calculated for each data ID and output to the data decompression unit 232.

  The data decompression unit 232 decompresses the compressed data based on the code computed by the code computation unit 231, the number of elements, and the definition information of the second data design document, and is common between the first and second data design documents. The input data related to the data ID is obtained.

FIG. 3 is a diagram showing a specific example of the second data design document stored in the storage unit 22 of the second data compression / decompression apparatus 20 shown in FIG. As shown in FIG. 3, in the storage unit 22, as in the case of the storage unit 12 of the first data compression / decompression device 20, the data ID, the maximum number of elements, the minimum value (min), the maximum value (max), Data representing the correspondence between accuracy and radix (number of patterns) is stored. The difference from FIG. 2 is that data about data ID : D is added at the end. The first and second data design documents include, as input data definition information, at least three items of the minimum value, maximum value, radix, and accuracy that the input data can take, along with the maximum number of elements of the input data. Having it is enough. This is because the value of the remaining one item is determined from the three items.

  Hereinafter, an operation example in the data transmission system configured as described above will be described. FIG. 4 is a flowchart showing a specific example of data compression processing in the first data compression / decompression apparatus 10 shown in FIG. Here, the first data compression / decompression apparatus 10 will be described as a representative example.

  In S <b> 301, the user first inputs and sets a desired data ID by operating the input unit 15 in the first data compression / decompression apparatus 10.

  In step S <b> 302, the control unit 13 determines whether the data ID input with reference to the storage unit 12 is correct. If the data ID is registered in the storage unit 12 (S302: Yes), the process proceeds to S303. On the other hand, when the data ID is registered in the storage unit 12, the process proceeds to S307.

  In step S <b> 303, the control unit 13 accepts data input by the user and temporarily stores the input data in the buffer 17. In addition, the control unit 13 displays transmission data (input data) on the display unit 14.

  In S304, the control unit 13 determines whether or not the transmission data is confirmed based on whether or not the user presses a confirmation button or the like. Here, when it is determined that the transmission data is confirmed (S304: Yes), the process proceeds to S305. On the other hand, when it is determined that the transmission data is not fixed (S304: No), the process returns to S303.

  In S <b> 305, the control unit 13 performs a compression process on each input data held in the buffer 17.

  In step S306, the control unit 13 outputs the compressed data to the network NW so as to be transmitted to the second data compression / decompression device 20 serving as a destination.

  In S302, if the input data ID is not correct, the control unit 13 displays an error message on the display unit 14 (S307).

FIG. 5 is a diagram showing a specific example of data compression processing based on the first data design document shown in FIG. As shown in this example, consider a case where the input data of each data ID takes the values “A: 0, B: no data , C: 300”. At this time , the code calculated by the code calculation unit 131 is “A: 1, B: no data , C: 20”. First, Data ( initial value 0) is defined as a variable for storing data. Then, the first data compression / decompression device 10 starts from the data ID: C with respect to the code,
Data_new = Data * performs a calculation of radix + code, continue to store each time the D ata_new in a new Data.

As for the number of elements, “maximum number of elements + 1” is treated as a radix, and the actual number of elements is treated as a code. That is, in order from data C,
Data_new = Data * (maximum number of elements + 1) + (number of elements of input data)
Ask for. Then, Data_new is stored in new Data each time.

About C code
0x41 + 20 = 20 = Data_new
About the number of elements in C
20 × 2 + 1 = 41 = Data_new
About the code of B
About the number of elements of B that do nothing because there is no data,
41 × 2 + 0 = 82 = Data_new
About the A code
82 × 5 + 1 = 411 = Data_new
About the number of elements of A,
411 × 2 + 1 = 823 = Data_new
As a result, Data = 823.

  Next, consider that the data compressed based on the first data design document shown in FIG. 2 is expanded based on the second data design document shown in FIG.

  FIG. 6 is a flowchart showing a specific example of data decompression processing in the second data compression processing apparatus 20 shown in FIG.

  In step S <b> 601, the control unit 23 of the second data compression / decompression apparatus 20 determines whether compressed data has been received from the first data compression / decompression apparatus 10 via the network NW. If it is determined that the compressed data has been received (S601: Yes), the process proceeds to S602. On the other hand, when it is determined that the compressed data is not received (S601: No), the standby state is maintained.

In S <b> 602, the control unit 23 temporarily stores the compressed data in the buffer 27.
In step S <b> 603, the control unit 23 determines whether the user has performed a data decompression start operation on the input unit 25. If it is determined that the user has performed an operation to start the data decompression process (S603: Yes), the process proceeds to S604. On the other hand, when it is determined that the user has not performed the start operation (S603: No), the standby state is maintained.

  In step S <b> 604, the control unit 23 performs decompression processing on the compressed data held in the buffer 27.

  In step S <b> 605, the control unit 23 displays each decompressed input data on the display unit 24 and notifies the user of the numerical value transmitted by the first data compression / decompression device 10 together with a message. If data decompression is not performed correctly, a message to that effect is displayed on the display device 24.

FIG. 7 is a diagram showing a specific example of data decompression processing based on the second data design document shown in FIG. As shown in the figure, when the second data compression / decompression apparatus 20 decompresses the compressed data, the data ID: A in order, contrary to the compression,
For the number of elements,
Number of elements = Data% (maximum number of elements + 1), Data_new = Data / (maximum number of elements + 1)
And Data_new is stored in new Data each time.
For the code,
Code = Data% radix, have rows calculations Data_new = Data / radix, continue to store each time the Data_new the new Data. Here, the% symbol represents the remainder, and the / symbol represents integer division (rounding down).

About the number of elements of A,
Number of elements = 823% 2 = 1, Data_new = 823/2 = 411
About the A code
Code = 411% 5 = 1, Data_new = 411/5 = 82
About the number of elements of B
Number of elements = 82% 2 = 0, Data_new = 82/2 = 41
About the code of B
Since the number of elements is 0, the number of C elements that do nothing,
Number of elements = 41% 2 = 1, Data_new = 41/2 = 20
About C code
Code = 20% 41 = 20, Data_new = 20/41 = 0
About the number of elements of D,
Number of elements = 0% 3 = 0, Data_new = 0/3 = 0
About D code
As a result of the number of elements is not 0, so nothing code of each data, "A: 1, B: no data, C: 20, D: to Mu Data" can be derived and. Therefore, as shown in FIG. 7, the data decompression unit 233 refers to the definition information of the second data design document in the storage unit 22 ,
(Input data) = code x precision + minimum value
Was calculated for each data ID, which is the input data before compression "A: 0, B: to Mu Data, C: 300" can be derived.

  Next, the case where the compressed data generated on the second data compression / decompression apparatus 20 side is decompressed on the first data compression / decompression apparatus 10 side will be described, contrary to the above case.

First, in the second data compression and decompression apparatus 20, based on the second data design document shown in FIG. 3, "A: 0, B: 1.05, C: to Mu Data, D: 1, 2" each of When the input data is compressed,
About D code
Since the code when the input data is 2 is 1,
0x3 + 1 = 1 = Data_new
About D code
Since the code when the input data is 1 is 0,
1 × 3 + 0 = 3 = Data_new
About the number of elements of D,
3 × 3 + 2 = 11 = Data_new
About C code
For C the number of elements that do not do anything because the data is not free,
11 × 2 + 0 = 22 = Data_new
About the code of B
22 × 11 + 5 = 247 = Data_new
About the number of elements of B
247 × 2 + 1 = 495 = Data_new
About the A code
495 × 5 + 1 = 2476 = Data_new
About the number of elements of A,
2476 × 2 + 1 = 4953 = Data_new
As a result, Data = 4953.

Next, when the first data compression / decompression apparatus 10 decompresses the compressed data based on the first data design document shown in FIG.
About the number of elements of A,
Number of elements = 49553% 2 = 1, Data_new = 4953/2 = 2476
About the A code
Code = 2476% 5 = 1, Data_new = 2476/5 = 495
About the number of elements of B
Number of elements = 495% 2 = 1, Data_new = 495/2 = 247
About the code of B
Code = 247% 11 = 5, Data_new = 247/5 = 22
About the number of elements in C
Number of elements = 22% 2 = 0, Data_new = 22/2 = 11
About C code
Since there is no description in the code design document of FIG.

As a result, the code of each data ID can be derived that "A: 1, B:: 5 , C to Mu Data". Therefore, the input data before compression, although can not be derived for D, which is a common part of the data ID based on the first data design document "A: 0, B: 1.05, C: to Mu Data" for Can be derived.

  As described above, according to the data transmission system according to this embodiment, transmission and reception can be performed in the common part even when the same data design document for the input data is not held in advance on the transmission side and the reception side. Further, since the data compression efficiency is high, it is particularly effective in the case of a narrow band network.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10: First data compression / decompression apparatus,
11, 21 ... communication section,
12, 22 ... storage unit,
13, 23 ... control unit,
14, 24 ... display device,
15, 25 ... input device,
16, 26 ... Timer,
17, 27 ... buffer,
20: Second data compression / decompression apparatus,
131, 231 ... code calculation unit,
132, 232 ... Data compression unit,
232, 232 ... Data decompression unit,
NW ... Network.

Claims (4)

Input data compression and decompression first data compression and expansion apparatus capable of executing each and a second data compression and decompression device is a connected data transmission system via a network,
The first data compression / decompression apparatus includes:
For each data ID for identifying the input data, minimum and maximum values the input data can be taken, and associates the precision representing the interval of the input data possible values between the maximum value from the minimum value A first storage unit for storing definition information as a first data design document;
A value obtained by subtracting the minimum value from the value of the input data for each data ID based on the definition information of the first data design document is divided by the accuracy, and a code related to the input data is calculated for each data ID. A first code calculation unit for calculating
The data based on the code the code calculating unit is calculated for each of the data ID, number of elements and the first definition information of the data design document is the number of the input data to be transmitted and received simultaneously for the same of the data ID A data compression unit that compresses the input data for each ID and outputs compressed data related to all the input data to the network ;
And having
The second data compression / decompression apparatus includes:
For each of the data IDs, the minimum value, the maximum value, and the accuracy are associated with each other, and definition information in which at least a part of the data ID is common to the first data design document is the second A second storage unit for storing the data design document;
Analyzing the compressed data based on the definition information of the second data design document , and calculating the number of elements and the code related to the input data for each data ID;
Based on the code calculated for each data ID by the second code calculation unit, the number of elements, and the definition information of the second data design document, the value obtained by multiplying the code by the precision is the minimum value. And a data decompression unit for obtaining the input data related to the common data ID;
A data transmission system comprising: The said 1st and 2nd memory | storage part has further memorize | stored further the maximum element number showing the maximum number of the said element number for every said data ID as the definition information of the said input data. Data transmission system. When the first and second storage units further have a radix representing the number of values that the input data can take between the minimum value and the maximum value as the definition information of the input data,
The data compression unit includes a value obtained by multiplying the radix read from the definition information of the first data design document for each input data by a predetermined initial value and the code calculated by the first code calculation unit. A first reference value obtained by adding the number of patterns to the first reference value multiplied by the number of patterns larger by one than the maximum number of elements and a second reference value obtained by adding the number of elements of the input data are used as the compressed data. Output as, and
The second code calculation unit obtains the number of elements of the input data from a remainder when the compressed data is divided by the number of patterns, and divides the compressed data by the number of patterns to obtain a third reference value look, determine the remainder when the third reference value divided by the radix as the code according to the input data,
The data decompression unit is a value obtained by multiplying the code by the accuracy for each data ID based on the number of elements obtained by the second code calculation unit, the code, and definition information of the second data design document. The data transmission system according to claim 2 , wherein the minimum value is added to the input data to obtain the input data before the compression . When the compression and the first data compression and expansion apparatus capable of executing the respective extension and a second data compression and decompression device of the input data are connected via a network,
The first data compression and decompression apparatus, for each data ID for identifying the input data, minimum and maximum values the input data can be taken, and the input data between said maximum value from said minimum value may take a first storing step of storing definition information that associates the precision representing the distance value as the first data design document,
The first data compression / decompression device divides, by the accuracy, a value obtained by subtracting the minimum value from the value of the input data for each data ID based on the definition information of the first data design document. A first code calculation step of dividing a value obtained by subtracting the minimum value from a value of input data by the accuracy, and calculating a code related to the input data for each data ID;
The first data compression and decompression device, the first code operation the code computed for each of the data ID in step, the same the data ID the is the number of elements and the number of the input data to be transmitted and received simultaneously for the A data compression step of compressing the input data for each of the data IDs based on the definition information of one data design document, and outputting compressed data relating to all the input data to the network;
The second data compression and decompression device, before each Kide over data ID, the minimum value, the maximum value, and associates the precision and the data ID to and from said first data design document A second storage step for preliminarily storing definition information common to at least a part of the second data design document;
The second data compression / decompression apparatus analyzes the compressed data based on the definition information of the second data design document , and calculates the number of elements and the code related to the input data for each data ID. A second code calculation step;
The second data compression / decompression apparatus comprises:
Based on the code calculated for each data ID in the second code calculation step, the number of elements, and the definition information of the second data design document, the value obtained by multiplying the code by the precision is set to the minimum value. A data decompression step of adding and obtaining the input data relating to the common data ID;
A data transmission method characterized by comprising:

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