JP3634911B2 - Data converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data converter for converting data transmission speeds and connecting lines having different transmission speeds during data transmission, and in particular, connecting a communication line having a high data transmission speed and a communication line having a low data transmission speed. The present invention relates to a data conversion apparatus.
[0002]
[Prior art]
Conventionally, it is known to connect a receiving device and a transmitting device through a communication line to transmit data. In the data transmission, for example, as shown in FIGS. 5A and 5B, a communication line and a device are connected.
In FIG. 5A, a receiving apparatus 10 capable of receiving data transmitted at a transmission speed of 9.6 kbps (kilobits / second) and a receiving apparatus 11 capable of receiving data transmitted at a transmission speed of 4.8 kbps are respectively illustrated. 2 shows a line configuration when connected to communication lines 12 and 13 having a transmission speed of 3.
In this line configuration, each of the receiving devices 10 and 11 can only receive data having a preset transmission rate, and therefore can only be connected to a communication line that transmits data at the set transmission rate. Two types of communication lines are used: a communication line 12 for data transmission at a transmission rate of 9.6 kbps and a communication line 13 for data transmission at a transmission rate of 4.8 kbps.
[0003]
FIG. 5B shows a line configuration when data is transmitted at a transmission rate of 9.6 kbps and a transmission rate of 4.8 kbps.
In this line configuration, there are a communication line 14 for transmitting data at a transmission speed of 9.6 kbps and a communication line 15 for transmitting data at a transmission speed of 4.8 kbps, and the transmission apparatus can only operate at a preset transmission speed. Since data cannot be transmitted, two types of transmission devices 16 and 17 for a transmission speed of 9.6 kbps and a transmission speed of 4.8 kbps are used.
[0004]
[Problems to be solved by the invention]
As described above, in conventional data transmission, it has been impossible to connect a communication line having a different data transmission speed and a receiver or transmitter. Therefore, a plurality of types of lines or a plurality of transmission devices are necessary.
The present invention has been made in view of the above-described conventional circumstances, and converts the data transmission rate and shortens the transmission time caused by the conversion of the data transmission rate to connect lines having different data transmission rates. An object of the present invention is to provide a data conversion apparatus that enables the above.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a data conversion apparatus according to the present invention connects a first line having a high data transmission rate and a second line having a low data transmission rate, and converts the transmission rate of data received from the first line. A data converter for transmitting data to the second line, the storage means for storing the data, the data received by the receiving means (current data), the data received prior to the current data, and already stored in the storage means Compared with the same type of data in the existing data (previous data) and compared with the comparison update means that updates the corresponding part in the previous data with the corresponding part of the current data for the part where the contents of both data overlap Transmission means for transmitting the data that has been subjected to the update process and stored in the storage means to the second line.
[0006]
According to the data conversion apparatus, when the receiving unit receives data from the first line having a high data transmission rate, the storage unit stores the received data. In this storage, the current data received by the comparison and update means is compared with the same type of previous data already stored in the storage means, and the corresponding part of the previous data is replaced with the current data for the part where the contents of both data overlap. Update with relevant parts. The update data stored in the storage means is transmitted by the transmission means to the second line having a low data transmission rate. Therefore, the data whose transmission speed is converted by being stored in the storage means is transmitted to the second line, and when there is the same kind of data, so-called thinning-out processing is performed and the data is transmitted. Is reduced.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A data conversion apparatus according to an embodiment of the present invention will be described with reference to FIG.
This data conversion apparatus includes a receiving means R connected to the first line 1 having a transmission speed of 9.6 kbps and receiving data, a determining means J for determining whether the received data is data to be converted, and a data to be converted. A conversion means T for converting received data from a data format used in the first line 1 to a data format used in the second line 2, and a buffer memory M for storing the received data converted by the conversion means T; When the buffer memory M stores data, the current data converted by the conversion means T is compared with the previous data stored in the buffer memory M, and the previous data stored in the buffer memory M by the current data. And updating means C for updating the data, and transmitting means S for transmitting data connected to the second line 2 having a transmission speed of 4.8 kbps.
[0008]
The receiving means R is connected to the first line 1 that transmits data at a transmission speed of 9.6 kbps, and is transmitted according to the communication method used in the first line 1 (for example, in FIG. 2 (1)). Receive the data format shown). The data includes an information part, a header information part, an error control code, and the like. The header information part includes a transmission destination identification number (ID), a transmission source ID, and a type of content included in the information part. And information such as position is stored.
[0009]
The discriminating means J discriminates whether or not the data received by the receiving means R is an object for converting the transmission rate. If the data is to be converted, the determining means J transfers the received data to the converting means T and is not subject to the conversion. The data is discarded.
That is, in this embodiment, the determination is made based on the transmission destination ID included in the header information in the data, and if the transmission destination ID is the ID of the device connected to the second line 2, conversion is performed. The data is transferred to the conversion means T as an object, otherwise the data is read out and discarded as an object not to be converted.
[0010]
The conversion means T converts the data format in the communication system used in the first line 1 to the data format in the communication system used in the second line 2.
In this embodiment, the data format shown in FIG. 2 (1) is converted to the data format shown in FIG. 2 (2). That is, in this conversion, the type of the information part is extracted from the header information part of the data on the first line 1, and the character code of the information part is converted into the character code used on the second line 2 to The data format used in 2 lines 2 is used. In the figure, for example, information a1 obtained by code conversion is displayed as information a1.
[0011]
The buffer memory M temporarily stores data of the difference between the received data amount and the transmitted data amount resulting from the difference between the transmission rate on the first line 1 and the transmission rate on the second line 2. For this reason, the temporary time from when data is received to when it is transmitted can be adjusted, and data received from the first line 1 can be transmitted to the second line 2 without any problem.
The buffer memory M, for example, divides the memory area into a certain fixed length in advance, stores the received data in the area, and transmits the transmission state of the transmission means from the first stored data. Are sequentially transferred to the transmission means S, and after the data transfer, the area in which the data is stored is again set as a free area in which subsequent data can be stored.
[0012]
As shown in FIG. 2 (3), the buffer memory M is a memory area of the buffer memory M as a whole, and each area surrounded by a solid line delimited therein is a fixed-length area. Thus, when the buffer memory M stores data, one data is sequentially stored in one area from the lower area in the figure, and when transferred, it is sequentially transferred from the lower area data.
[0013]
The comparison update means C compares all previous data stored in the buffer memory M and waiting for transfer to the transmission means S with the current data to be stored in the buffer memory M from the conversion means T. When data having the same type information is detected, the portion where the content of the previous data overlaps with the current data is updated to the content of the current data, thereby making the previous data and the current data one data. .
[0014]
In the present embodiment, for example, when the buffer memory M is in the state shown in FIG. 2 (3) and the current data shown in FIG. The type information part of the previous data and the type information part of the current data are compared, and data having the same type information part in the previous data (for example, data of type a is type a) is detected. As data. As described above, when the same type of previous data is detected, the content information portion (the information a1 ′ and the information a1) indicating the same content included in the previous data and the current data is stored in the same position in the data. What)
Among them, the overlapping portions (information a1 ′ and information a1, information a2 ′ and information a2, information a4 ′ and information a4) are updated with the information included in the current data. As a result, the same type of previous data and current data are integrated into one data of type a as shown in FIG.
[0015]
Applying the above integration processing when, for example, stock price information data is handled by data transmission, the type information part represents a brand of a certain company, and the information part represents the current stock price of the brand. In this way, processing is performed such that the latest stock price information of a certain brand is obtained by updating the data. In addition to the stock price information data, the integration process can be used for weather and temperature information data.
[0016]
The transmission means S is connected to the second line 2 that transmits data at a transmission speed of 4.8 bps, and transmits data sequentially received from the buffer memory M according to the communication method used on the second line 2.
[0017]
Next, the operation of the data conversion apparatus will be described with reference to FIGS. When the receiving unit R receives data from the first line 1, the determining unit J determines whether the received data is a conversion target, and the conversion target data is transferred to the conversion unit T. The data to be converted is converted by the conversion means T from the data format used on the first line 1 to the data format used on the second line 2 and stored in the buffer memory M.
[0018]
For example, when the data shown in FIG. 2 (1) is received by the receiving means R and is judged to be converted by the judging means J, the data is converted into the data format shown in FIG. 2 (2) by the converting means T. The buffer memory M is stored as shown in FIG.
[0019]
When the received current data is stored in the buffer memory M from the conversion means T, the comparison / update means C detects previous data of the same type as the current data in the previous data stored in the buffer memory M. Updates the overlapping portion of the previous data with the same content as the current data to the content of the current data. As a result, the amount of data to be transmitted is reduced in order to make the information content of the previous data and the current data one data.
For example, when the buffer memory M is in the state shown in FIG. 2 (3), the conversion means T converts the current data shown in FIG. 3 (1) into the current data shown in FIG. When the memory M stores the current data, the comparison / update means C detects the same kind of previous data in the data stored in the buffer memory M, and the same kind of previous data is updated based on the current data. It becomes the data of type a included in the buffer memory M shown in FIG.
[0020]
At the same time as the above processing is performed, the buffer memory M transfers the stored data to the transmission means S in the order of transfer. The transmission means S transmits the received data to the second line 2. When one piece of data is transmitted by the transmission means S, the buffer memory M clears the area where the data that has been transmitted is stored, makes it an area where subsequent data can be stored, and transfers it to the next. Is transferred to the transmission means S. In this way, data is sequentially transferred from the buffer memory M to the transmission means S, and the transmission means S sequentially transmits the data to the second line 2.
[0021]
As described above, data can be transmitted from the first line 1 to the second line 2 having different transmission speeds. When data of the same type as the data stored in the buffer memory M is received, one data is stored. Therefore, the amount of data to be transmitted can be reduced, and the data transmission time can be shortened.
Further, even if the data formats used in the first line 1 and the second line 2 are different, transmission can be performed without any problem.
[0022]
Next, an example of a communication line using the data conversion apparatus according to this embodiment will be described with reference to FIGS.
FIG. 4A shows a case where a data conversion device is applied to FIG. 5A of the conventional example. The data conversion device 5 causes the 4.8 kbps receiving device 11 to be connected to the 9.6 kbps communication line 12. As a result, it is possible to configure a line with only one type of communication line for 9.6 kbps.
[0023]
FIG. 4B shows a case where a data conversion device is applied to FIG. 5B of the conventional example. The data conversion device 5 transmits a transmission device 16 for 9.6 kbps and a communication line 15 for 4.8 kbps. As a result, it is possible to transmit data to the two types of communication lines 14 and 15 using only a transmission device for 9.6 kbps.
Thus, by using the data converter 5, it is possible to reduce the number of line types, reduce the number of transmitters to be used, and the like.
[0024]
In this embodiment, the comparison / update means C performs the comparison / update process before storing the received current data in the buffer memory M. However, after the received current data is temporarily stored in the buffer memory M, the same processing is performed. It is also possible to perform a comparative update process.
Further, in the present embodiment, the comparison / update means C performs a process of updating the duplicate content portion to the content of the current data received later when the previous data of the buffer memory M and the received current data are of the same type. However, depending on the information contained in the data, for example, if the data with the larger numerical value is necessary among the overlapping contents of the previous data and the current data, the larger value is selected. In addition, it is possible to update the data to the necessary contents by selecting the necessary one of the same contents of the previous data and the current data.
[0025]
In this embodiment, the conversion means T converts the data format and stores it in the buffer memory M, and the transmission means S transmits the data in the buffer memory M as it is. An apparatus configuration in which the data is stored in the memory M, transferred from the buffer memory M to the conversion means T, converted into a data format, and transmitted by the transmission means S may be employed.
[0026]
Further, when the data formats used in the first line 1 and the second line 2 are the same, the conversion means T can be omitted.
Further, if the line configuration is such that all data received by the receiving means R is transmitted to the second line 2, the determining means J can be omitted.
In this embodiment, the data conversion apparatus connects a line with a transmission speed of 9.6 kbps and a line with a speed of 4.8 kbps. Can be connected.
[0027]
【The invention's effect】
As described above, in the data conversion device according to the present invention, the receiving device receives data from the first line, the storage means stores the received data, and the transmitting means transmits the stored data to the second line. In addition, when the current data received by the receiving means and the previous data stored in the buffer memory are of the same type, the comparison / update means replaces the corresponding content in the previous data with the current data The amount of data to be transmitted is reduced by updating the relevant part to make the current data and the previous data into one data including necessary contents. Therefore, it is possible to connect lines having different transmission speeds by converting the data transmission speed, and to reduce the amount of data to be transmitted and shorten the time required for transmission.
Furthermore, by using this data conversion device, depending on the configuration of the line, the number of line types used can be reduced, the number of transmitters used can be reduced, etc. It becomes possible to reduce.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a data conversion apparatus according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a data format and a state of a memory buffer according to an embodiment of the present invention.
FIG. 3 is a conceptual diagram illustrating a data format and a state of a memory buffer according to an embodiment of the present invention.
FIG. 4 is a block diagram showing a line using the data conversion apparatus of the present invention.
FIG. 5 is a block diagram showing a conventional line.
[Explanation of symbols]
1 .... first line, 2 .... second line,
R ... receiving means, M ... buffer memory,
C./Comparison update means, S // Transmission means,

Claims (1)

A data converter that connects a first line having a high data transmission rate and a second line having a low data transmission rate , temporarily stores data received from the first line in a storage means, and transmits the data to the second line. And
The data is in a data format in which a type information part indicating the type of the data is added to an information part including a plurality of content information parts, each of which is information content,
Receiving means for receiving data from the first line;
When the type information part of the current data received by the receiving means is compared with the type information part of the previous data received and already stored in the storage means , and the current data and the previous data are the same type For both overlapping data information parts arranged at the same position in the information part in both data, the relevant content information part in the previous data is updated with the relevant content information part of the current data, thereby making both data one data Comparative update means to be integrated into
A data conversion apparatus comprising: a transmission unit configured to perform comparison update processing by the comparison update unit and transmit data stored in the storage unit to the second line.

Images