JPH09128212A - Method and device for compressing data on bill information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily compress/restore data on bill information in a short time by setting a difference between individual data on bill information and a reference value to be compression data of individual data and setting the sum of compression data of individual data and the reference value to be restoration data of individual data. SOLUTION: When the compression processing of a designated name is instructed from an operation part 409, reference value data Y of the name to be compressed is taken out from a reference value table. When data corresponding to the compressed name in bill information which is previously inputted to a memory 405 is set to be X, the operation of Z=X-Y is executed, and the difference data Z is stored in the compression data table of the memory 405 as compression data of non-processed data X. When an expansion (restoration) processing is instructed from the operation part 409, the operation of X=Y+Z is executed from reference value data Y of the name and compression data Z corresponding to the name. The operated result, namely, restoration data X is written into an expansion data table (generated on the memory 405).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for compressing securities information data.

[0002]

2. Description of the Related Art Securities information is used for each of a very large number of stocks, and the daily and unlisted current positions, open prices, high prices, and
It consists of numbers that represent prices, such as low prices. Further, analysis of securities information involves displaying and analyzing data over a long period of time, which requires transmission and storage of a very large amount of data. Therefore, some kind of data compression is desirable for transmitting and storing securities information,
For this purpose, compression techniques such as various encoding methods can be used. However, since the securities information is numerical data representing the price, a compression method is required so that the original information can be completely restored from the compressed data.

[0003]

When the data compression of the securities information is performed using a compression technique such as an advanced coding method, a large processing capacity is required and the processing time becomes long. Further, if the compression rate is low, the memory for storage becomes large, which causes a cost increase. Considering the case of transmitting securities information, for example, CCITT V. In order to transmit a large amount of securities information through the low-speed modem by the data compression procedure of 42, the line use time becomes long and the cost becomes heavy.

An object of the present invention is to provide a data compression method and apparatus for securities information, which enables data compression and decompression by simple processing and accurate data decompression.

[0005]

According to the present invention, a reference value for each piece of securities information is set in advance, and a difference between each piece of securities information and the reference value corresponding to the data is obtained to obtain the above-mentioned values. Disclosed is a data compression method for securities information, wherein compressed data of individual data is obtained, and the sum of the compressed data of the individual data and the corresponding reference value is obtained to be decompressed data of the individual data. .

Further, according to the present invention, the reference value is a value determined from an average value or an intermediate value of the data within a predetermined period, and the securities information data according to claim 1. A compression method is disclosed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to its embodiments. FIG. 3 is a block diagram showing an example of a processing system having functions such as receiving securities information, compressing it, storing it in a memory, and restoring and displaying the compressed securities information. When the securities data processed by the device or another terminal is transmitted through the input / output line 301 such as a public line or a dedicated line, the terminal 302 equipped with a modem, or the terminal 302 and the communication line 306. It is received by the connected terminal 303, terminal 304, or terminal 305. The securities information is sent out in the reverse route. Here, the terminals 302 to 305 are personal computers or workstations.

FIG. 4 is a block diagram showing an example of the hardware configuration of one terminal 302, and the same applies to other terminals. In the figure, the line control interface 402 transmits and receives transmission data between the input / output line 301 and the memory (RAM) 405. Read-only memory (ROM) 40
An execution program of the CPU 403 is stored in 4. The display unit 407 that displays the securities data is an operation unit interface 408 for operating the display unit interface 406 to instruct the compression / decompression process of the securities data, the search / reference process, or the transmission of the compressed data.
Via the external memory interface 410, and the external memory 411 via another terminal or peripheral device 41.
3 is connected to the data bus 414 via the input / output interface 412. In addition, the peripheral devices 413,
It may be connected via the communication line 306 of FIG.

1 and 2 are flow charts showing one embodiment of a method for compressing data of securities information and a method for expanding the same according to the present invention. The method of the present invention will be described below with reference to these drawings. . First, FIG. 1 is a flow chart of the compression method.
9 (step 101), the reference value data of the brand to be compressed is taken out from the reference value table (step 102). However, it is assumed that the data to be compressed is stored in the memory 405 of FIG.

FIG. 5 shows an example of a reference value table, which is a table in which reference value data 503 for each brand 502 is stored, which is read in the memory 405 in FIG. Here, securities information such as stock prices changes from day to day, but it fluctuates up and down around a representative value such as an average value or an intermediate value for a certain period unless there is a significant increase or decrease. Is. Therefore, the above-mentioned reference value table is a table in which this representative value is determined and set in advance.

Returning to FIG. 1, assuming that the reference value data fetched in step 102 is Y and the data corresponding to the stock in the securities information that has been input in the memory 405 in advance is X, then

## EQU1 ## The calculation of Z = XY is performed (step 103), and the difference data Z
Is stored in the compressed data table of the memory 405 as compressed data of the unprocessed data X (step 104). Here, the unprocessed data X and the reference value data Y are the current price, open price, ...
The calculation of (Equation 1) is performed for each of these values.

FIG. 6 shows an example of a compressed data table, which is data relating to one issue. The current price (closing price), open price, high price, low price, etc. for each day are shown for the unlisted and unlisted fields, and the numerical values of the contents of the table are the values calculated by the above (Equation 1). For example, assuming that FIG. 6 shows compressed data of the brand “Pyrosphere”, the current value “−1” of January 10 unlisted is the reference value data “40” of the same brand of FIG.
It means that the value is 1 yen lower than "0", that is, the current value is 399 yen. Thus, according to the present embodiment,
Data with a large number of digits (3 digits in the example of FIG. 5) can be compressed into data with a small number of digits (1 or 2 digits in FIG. 6), and can be compressed by an extremely simple process as shown in (Equation 1). .

FIG. 2 is a flowchart showing a decompression process for decompressing and restoring the data compressed by the process of FIG. In the figure, when an instruction for expansion processing is issued to a certain brand from the operation unit 409 (step 20).
1), the reference value data Y of the issue is taken out from the reference value table as described in FIG. 5 (step 20).
2). The compressed data Z corresponding to this brand is stored in the memory 40.
The following calculation is performed by reading from the compressed data table 5 (step 203).

## EQU00002 ## X = Y + Z Needless to say, this calculation is also performed for each corresponding data such as the current price, open price, ... Then, this calculation result, that is, the restored data is written in the decompression data table (created on the memory 405) (step 204).

FIG. 7 is an example of a decompressed data table which is the restored securities information, and includes the reference value table of FIG. 5 and FIG.
It corresponds to the compressed data table of
Represents the securities information of. Since this decompression processing can be performed by an extremely simple calculation of (Equation 2), high-speed processing is easy,
Moreover, since there is no approximation processing in the operations of (Equation 1) and (Equation 2),
The numerical value of securities information can be accurately restored.

In the above description, the compression and decompression processing is activated by an operation input, but the compression processing is activated when unprocessed data is input from the outside or at a predetermined cycle. May be performed.

Although the reference value table described with reference to FIG. 5 is assumed to be created in advance, a representative value such as an average value or an intermediate value is regularly calculated from daily data, and the reference value table You may make it correct a value table automatically. Also, when the obtained compressed data values are always the same value with the same sign, it is expected that a large value movement will occur, so detect this and prompt the operator to update the reference value table. Is also effective. Further, the combination of the data compression according to the method of the present invention and the other completely decompressible compression technique enables more efficient data compression.

[0017]

According to the present invention, the data of the securities information can be compressed and restored by the simple and short-time processing, the effective use of the storage means for storing the securities information, and the significant improvement of the securities information transmission efficiency. The cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of a data compression method for securities information according to the present invention.

FIG. 2 is a flowchart showing a decompression process of data compressed by the method of FIG.

FIG. 3 is a block diagram illustrating a processing system.

FIG. 4 is a block diagram showing a configuration example of one terminal.

FIG. 5 is a diagram showing an example of a reference value table.

FIG. 6 is a diagram showing an example of a compressed data table.

FIG. 7 is a diagram showing an example of a decompression data table.

[Explanation of symbols]

 301 Input / output line 403 CPU 405 Memory (RAM)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Takazawa 3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd.

Claims (4)

[Claims] 1. A reference value for each piece of securities information data is set in advance, and a difference between each piece of securities information data and the reference value corresponding to the data is calculated to obtain compressed data of the individual data. A data compression method for securities information, wherein the sum of the compressed data of the individual data and the corresponding reference value is obtained and used as the restored data of the individual data. 2. The data compression method for securities information according to claim 1, wherein the reference value is a value determined from an average value or an intermediate value of the data within a predetermined period. 3. A reference value storage unit for storing a predetermined reference value for each data of the securities information, and the individual data and the reference value storage unit corresponding to the data. Compressed data calculating means for obtaining the difference between the compressed data of the individual data by calculating the difference from the reference value, and the sum of the compressed data of the individual data and the corresponding reference value stored in the reference value storage means. And a decompressed data calculating means for obtaining the decompressed data of the individual data, and a data compression device for securities information. 4. The data compression of securities information according to claim 3, wherein the reference value of the reference value storage means is updated by an average value or an intermediate value of the data within a predetermined period. apparatus.