JPS6239941A - Data-transmission method - Google Patents

Abstract

PURPOSE:To drastically decrease the information-quantity of transmission, to shorten the time of exclusive use of a transmission net, and to economize the transmission by so forming the titled method that a terminal equipment on the transmission-side transmits only a part that is different from the last-time data to a terminal equipment on the reception-side. CONSTITUTION:Past data is respectively filed in a transmission-side data file 6 and a reception-side data file 7. The transmission-side terminal equipment 4 transmits only the data of the part that is updated to the reception-side terminal equipment 5. On the part of the equipment 5, the file of the past data is modified and a new data is reproduced, and such a part that is identical to the past data is not transmitted. As a result, the economy is improved by the reduction in the communication cost, and the time of the exclusive use of the transmission net is made able to be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is a data system that can dramatically reduce the amount of transmitted information in regular and regular data transmission using a public data network, LAN, etc. Regarding transmission method.

[Conventional technology]

Conventionally, in periodic data transmission, the same data as the previous transmission, which occupies most of the data, is transferred each time.

Table 1 below is an example of transmission of engine department data, which means data transmission at 15:00 on October 4, 859. In addition, the following Table 2 shows an example of r-evening transmission at 16:00 hours later.The difference from the previous time (No.
TEMP'XC))65→64 (85GgNERA
Other data is the same as last time except that TOR18NG BEARING TEMP is changed.

Table 1〉 59/10/415:00 MACHINgRY DA
TAol MAIN ENG BEARING TIE
MP'(C):Mu175. Record 73. Bian 373...
・・・・・・・・・85 GENERATORING BEARING TEMP'(C'l :A168
, 4265, 4365 2nd edition〉 59/10/416:00 MACHINERY DA
TAol MAIN BNG BIEARING TE
MP' (C) Near fL175, A273, A3
72 ,・・・・・・・・・・・・85 1JNERA
TORENG BEARING TKMP' (C): 4168
, 4265, 364 [Problems to be Solved by the Invention] However, as described above, in the conventional data transmission method, the same data as the previous rotation excess is transferred every time, which is not only uneconomical but also If there are many users, the waiting time until data transfer becomes long, which is inconvenient.

This invention was made to eliminate the above-mentioned conventional drawbacks, and provides a data transmission method that can dramatically reduce the amount of transmitted information, improve economic efficiency, and shorten the time occupied by the transmission network. The purpose is to

[Means for solving problems]

In the data transmission method of the present invention, when data is periodically transmitted from a transmitting terminal device to a receiving terminal device, past data is stored in the transmitting side data file of the transmitting terminal device and the receiving side data file of the receiving terminal device, respectively. The data is stored in memory, and the sending terminal device transmits the data to the receiving terminal device only for the parts that are different from the previous data, and the receiving terminal device stores the previous memorized data in the receiving data file based on the received data. was modified to play new data.

[For production]

In the case of periodically transmitting data, this invention extracts only the data that is different from the previously transmitted data stored in the sending file of the sending terminal device and transmits it to the receiving terminal device. The terminal device modifies the previous data stored in the receiving side data file based on the data transmitted from the transmitting side terminal device and reproduces new data.

〔Example〕

Embodiments of the data transmission method of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a data transmission device applied to one embodiment. In FIG. 1, 1 is data, and an example of the engine section data is shown in FIG.

As is clear from Figure 2, this data 1 is from 859 l.
rMAINENG BEI:AR as 9.01 channel 1a, meaning the data at 15:00 on the 14th of θ.
It means ING TEMP J, and the Ambly/ part is the part that changes at 16:00.

This data 1 also shows 02 channel 1b. As this 02 channel, “GENERAT
The part that shows ORENG BEARING TEMP J and is underlined is the part that changes at 16:00.

Also, data 2 is the same engine data as data 1 above, and shows the data at 16:00 one hour later, and 01 channel 2a is the same as Ol channel 1a, but the Angline part has changed. .

02 channel 2b is also the same as 02 channel lb, but the angle part has changed.

In FIG. 2, data 3 indicates data actually transmitted with respect to data 2, and data 3a indicates rMD: kite CHI.
Indicates NERDATA J. Also 1, data 3b is rD
2: The same value as the data sent before IHrJ is 2
There are several. When Dn, it is defined that there are n pieces.

Data 3C has changed from the data at 15:00,
The data value ``73'' is shown, and the data 3d is 15:
Changed from data 00, data value "64"
It shows.

Here, the explanation is shown in FIG. In FIG. 1, a transmitting side data file 6 is connected to a transmitting side terminal device it4. The above data 1 is stored in advance in this transmitting side data file 6.

The receiving terminal device 5 also has a receiving data file 7.
is connected to this receiving side data file 7,
Data 1 is stored in memory.

Next, the data transmission method of the present invention will be explained with reference to FIGS. 1 to 3. When data 2 of the engine department data at 16:00 on October 4, 859 is input to the sending terminal device 4 as new data, the data at 15:00 one hour before, which is stored in the sending data file 6 in advance, is input as new data. A comparison with data 1 is made.

As a result of this comparison, the difference between data 2 and data 1 is that ``Kite IN ENG BEARING TEMP shop 3's 73° (C) J data IIL is data 2a.
(72°(C)), and r GE
NERATORENG BEARING TFMP 4
Data 1b for month 651C of 3 is data z b (64'
Suppose that it has changed to C)).

At this time, the data 3 that is actually transmitted from the transmitting terminal device 3 to the receiving terminal device i15 is data indicating engine section data, 9a (MD), and the same data as before continues. The new data s b (D2), the new data 3 c (data 72 of A 3), and the new data 9d (data 64 of 43).

After receiving the actually transmitted data 3 (data 3 &~3d) for the data 2, the receiving terminal device 5 receives data 15 stored in the receiving data file 7:
Data 3a is newly changed after comparison with data 1 of 00.

Correct 3d and set it as data 2 at 16:00.

Display what you play or store it in a data file.

In this way, in the first embodiment, past data is stored in the transmitting side data file 6 and the receiving side data file 7, respectively, and the transmitting side terminal device 4 stores data only for newly changed parts. The receiving terminal device 5
At the same time, the receiving terminal device 5 modifies the past data file and reproduces the new data.

Since the same portion as past data is not transmitted, the amount of transmitted signals is reduced.

FIG. 3 shows another specific example of data applied to the data transmission method of the present invention. In this figure 3,
The symbols related to data are the same as in FIG. 2. Data 1 shown in Figure 3 is an example of engine department data, and shows the case of transmitting data displayed in a graph.
This is the graph at 5:00. Further, data 1a shows an example of temperature, and the portion of flat 3 changes at 16:00.

7''-px is an example of engine department data similar to data 1, and shows a graph at 16:00.

Data 2b is similar to data 1, but only the part 3 has changed from the graph at 15:00.

Data 3 shows a graph that is actually transmitted in contrast to the graph of data 2. Data 3 & is MI): MA
CHINKRY DATA, data 3b is D 2
: i Indicates that the graph is the same as the one sent Hr ago. In this case, it indicates that the same thing as the two previous ones continues. Furthermore, data J.

shows a graph that has changed from the data at 15:00.

The case of transmitting data as shown in FIG. 3 is similar to the above embodiment, but in FIG.
However, it has been shown that it is possible to synthesize and reproduce images by sending only the parts that have changed, without transmitting the same shapes as before. The other equipment configurations are the same as in FIG.

The case of transmitting data as shown in Fig. 3 is the same as the case of transmitting data as shown in Fig. 2, and even in the graph display (shape), the amount of transmitted signal decreases by 5 because the same data is not transmitted each time. There is an effect.

As is clear from the above, the present invention can dramatically reduce the amount of transmitted information in regular and periodic data transmission using public data networks, in-house LANs, etc., is highly economical, and reduces transmission network Occupancy time can be reduced, but for example,
In the case of ship-to-shore data transmission using the Inmarsat system, it is effective not only for reducing communication costs but also when an economical and efficient transmission method is required for effective use by a large number of ships. be.

Further, the present invention can be used for terminal-to-terminal communication (communication between converters, teletex, videotex, etc.) in which data is transmitted periodically in a fixed format.

In particular, it is expected to be applied in cases where communication costs are high or where exclusive time is limited, such as international communication and ship-to-land communication using Inmarsat.

〔Effect of the invention〕

As described above, according to the data transmission method of the present invention, only the data stored in the transmitting side file of the transmitting terminal device that is different from the previously transmitted data is retrieved and transmitted to the receiving terminal device, The receiving terminal equipment modifies the previous data stored in the receiving data file based on the data transmitted from the transmitting terminal equipment and reproduces new data, which has the effect of reducing the amount of transmitted signals. be.

Along with this, it becomes possible to improve economic efficiency by reducing communication costs and shorten the time occupied by the transmission network.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a data transmission device applied to an embodiment of the data transmission method of the present invention. FIG. 2 is a diagram showing data applied to the above data transmission method, and FIG. 3 is a diagram showing another specific example of data applied to the same data transmission method. 1-3, 1 iL, 1 b, 2 a, 2
b, 3a to 3d...data, 4...sending side terminal device, 5...receiving side terminal device, 6...sending side data file, 7... receiving side data file. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 3 3a

Claims (1)

[Claims] When periodically transmitting data from a sending terminal device to a receiving terminal device, past data is memorized in the sending data file of the sending terminal device and the receiving data file of the receiving terminal device, and then sent. The side terminal device transmits data to the receiving side terminal device only for the parts that are different from the previous data, and the receiving side terminal device modifies the data stored in the receiving side data file based on the received data and reproduces the new data. A data transmission method characterized by: