JPH1041829A - Data transmitter, method therefor and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the acceleration of data restoration and transmission error detection by reading out previously memorized data. SOLUTION: When data are transmitted from a transmitter 1 to a receiver 2, data encoded into an NRZ code generated from a control part 3 of the transmitter 1 are encoded into a biphase code, containing error information by an encoding part 4 and sent from a transmission part 5 through a cable 13 to the receiver in lumps of 8 bits. At the receiver 2, the transmitted data are received by a reception part 6 and by immediately reading out a corresponding address existing in a memory, the data are converted to restored data 11 and transmission error information 12, and transmitted to a control part 10. At this time, only by reading out the contents of the address in the memory corresponding to the encoded data, can the transmission error detection of the restored data 11 be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission apparatus and method, and a recording medium, and more particularly to code conversion.

[0002]

2. Description of the Related Art Conventional code conversion is disclosed in Japanese Patent Application Laid-Open No. 62-2982.
As disclosed in Japanese Patent Application Publication No. 54-54, an input signal encoded into a code including error information input by data transmission is transmitted to a CPU.
Has been performed to convert the data into easy-to-process restored data, perform a logical calculation according to a certain rule when detecting a transmission error, and determine whether the restored data is correct.

As an example of the above, conventional data transmission in the case of using data encoded in a biphase code as data to be transmitted including the error information and using an NRZ code as the restored data which is easy for the CPU to process. The device will be described.

A bi-phase code is a code that gives a binary signal to be transmitted a rising edge and a falling edge at the center of each bit.
1 "and" 1 "are represented by" 10 ". For example, 4-bit transmission data “0110” has a waveform as shown in FIG. As shown by the arrow in FIG. 4, the biphase code can be restored to the original data as it is by determining whether the latter half of each bit is 0 or 1. Also, by calculating the exclusive OR of the first half and the second half of each bit and finding the location where the result is 0, the location where the transmission error occurs can be detected. As described above, since the biphase code forms a data string having no serial component, it is a code suitable for a data transmission system, particularly a wireless data transmission system.

FIG. 5 shows a conventional data transmission method. Assuming that data transmission is performed from the transmitter 1 to the receiver 2, data generated from the control unit 3 of the transmitter 1 is encoded by the encoding unit 4 into a bi-phase code to which error information is added, and transmitted from the transmission unit 5. It is sent to the receiver 2. In the receiver 2, the data encoded in the bi-phase code transmitted is received by the receiving unit 6 and decomposed for each bit by the bit decomposing unit 7. By judging whether the latter half of each bit of the encoded data is “0” or “1”, the control unit 3 makes a decision to restore the data generated from the control unit 3, and the transmission error detection is performed by the error checking unit 9. Then, the exclusive OR of the first half and the second half of each bit is calculated, and a check is made to see if there is any transmission error where the result is "0". The restored data 11 and the transmission error information 12 are transmitted to the control unit 10, respectively.

[0006]

However, in the above-mentioned conventional method, the received data must be decomposed into bits, bits must be rearranged, and an error check must be performed for each bit. There was a problem that it took.

An object of the present invention is to solve the above-mentioned problem and to perform data restoration processing and transmission error detection simultaneously and promptly.

[0008]

In order to achieve the above object, a first data transmission apparatus according to the present invention comprises: a transmitting section for encoding data to be transmitted into a code containing error information and transmitting the encoded data; A receiving unit that receives the decoded data and performs data restoration and transmission error detection, and the receiving unit includes a memory unit in which restored data and transmission error information corresponding to a plurality of the encoded data are tabulated. It is a thing.

[0009] Further, a second data transmission device of the present invention comprises:
A bi-phase code is used as a code including error information.

[0010] Further, a third data transmission device of the present invention comprises:
Wireless communication is performed between the transmitting unit and the receiving unit.

The data transmission method according to the present invention includes a first step of encoding data to be transmitted into a code containing error information and transmitting the encoded data, a second step of receiving the encoded data, A third step of performing data restoration and transmission error detection by referring to a memory unit in which restored data and transmission error information corresponding to a plurality of the encoded data are tabulated using the received data. It is provided.

Further, the recording medium of the present invention uses the received data to refer to a memory section in which restored data corresponding to a plurality of encoded data and transmission error information are tabulated to perform data restoration and transmission. A program for performing error detection is recorded.

[0013]

With the above configuration, the first data transmission apparatus of the present invention does not need to decompose received data into bits, rearrange the bits, and perform a transmission error check for each bit. It is possible to speed up not only restoration but also transmission error detection.

[0014] Further, a second data transmission device of the present invention comprises:
Although the first data transmission apparatus uses a bi-phase code, the bi-phase code is a data string having no DC component because the data is inverted and sent twice. High reliability because it is suitable and transmission errors can be detected regardless of the number of errors, but data transmission because transmission error information must be detected by finding the exclusive OR for each bit when recovering data. Since it takes time to detect the transmission error and the transmission error detection, the advantage obtained by greatly speeding up the data restoration and the detection of the transmission error is very large.

Further, the third data transmission device is one in which radio communication is applied to the first data transmission device. However, radio transmission is less reliable than wired transmission, and transmission errors frequently occur. However, the advantages of the data restoration and transmission error detection provided by the greatly increased speed are very large.

Further, the data transmission method of the present invention eliminates the necessity of decomposing received data into bits, rearranging bits, and performing a transmission error check for each bit. Higher speed can be achieved.

Further, the recording medium of the present invention can achieve high speed in data restoration and transmission error detection, and has improved distribution and storage.

Hereinafter, a data transmission device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a data transmission device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the table calling unit.

In FIG. 1, reference numeral 1 denotes a transmitter, which includes a control unit 3 for emitting data, an encoding unit 4 for encoding the data into a biphase code, and a transmission unit 5 for transmission. Reference numeral 2 denotes a receiver, a receiving unit 6 for receiving the transmitted data, a table calling unit 20 in which restored data corresponding to the biphase code and transmission error information are tabulated and held, And part 10. Reference numeral 13 denotes a cable connecting the transmitter 1 and the receiver 2, 11 denotes restored data, and 12 denotes transmission error data.

In the table calling section 20, 2
Reference numeral 1 denotes a bi-phase code of all received 8-bit patterns, and a 4-bit NRZ code 22 and transmission error information 16 are stored in the memory 1 for each pattern.
7 is assigned to address 18.

In the data transmission apparatus as described above, when data is transmitted from the transmitter 1 to the receiver 2, the data encoded by the NRZ code generated from the control unit 3 of the transmitter 1 is transmitted to the encoding unit. At 4, the signal is encoded into a biphase code containing error information, and is transmitted from the transmission unit 5 to the receiver 2 by 8 bits at a time via the cable 13. In the receiver 2, the transmitted data is received by the receiving unit 6, and the corresponding address in the memory 17 is immediately read out by the table calling unit 20, thereby converting the data into the restored data 11 and the transmission error information 12. To the control unit 10.

FIG. 4 shows the details of the table calling unit 20.
The 4-bit NRZ code 22 as the restored data corresponding to the bi-phase code 21 of all the 8-bit patterns received by the receiving unit 6 and the transmission error information 16 are tabulated and assigned to the address 18 in the memory 17. Keep it. By simply designating the address 18 corresponding to the 8-bit code received by the receiving unit 6, the table calling unit 20 can retrieve the restored data and the transmission error information enabling the detection of the transmission error. Data recovery and transmission error detection.

In the present embodiment, data is encoded into a biphase code, but it goes without saying that another encoding method may be used. For example, the encoding unit 4 adds a redundant code serving as error information to the data issued from the control unit 3, encodes the data into an 8-bit code, and restores the restored data corresponding to all these patterns of data. The transmission error information may be obtained in advance and tabulated. At this time, for example, by setting a portion corresponding to a bit in which a transmission error has occurred to “1” and a portion corresponding to a normal bit to “0”, a transmission error for each bit can be detected.

Further, in the present embodiment, the transmitter 1 and the receiver 2 are connected using the cable 13, but the cable 13 may be wireless. Wireless transmission is less reliable than wired transmission, and transmission errors frequently occur.Therefore, the configuration shown in the present embodiment can greatly speed up data restoration and transmission error detection. The effect of the comparison is greater than the case of using the wire.

In the present embodiment, the encoding unit 4
The bit code is encoded into an 8-bit code to which error information is added, and transmission is performed 8 bits at a time. It goes without saying that the data may be transmitted from the unit 5.

The code conversion method according to the present embodiment is realized by a program, and is recorded on a recording medium such as a floppy disk and transferred, so that it can be easily implemented by another independent computer system. .
FIG. 3 is a diagram for explaining a case where this is carried out using a floppy disk.

FIG. 3A is a diagram showing an example of a physical format of a floppy disk which is a recording medium body.
Create tracks concentrically from the outer circumference to the inner circumference,
It is divided into 16 sectors in the angular direction. The program is recorded according to the allocated area.

FIG. 3B is a diagram for explaining a case for storing the floppy disk. From the left, a front view of the floppy disk case, a sectional view thereof, and a floppy disk main body are shown. Thus, the floppy disk body 31 is
2, the floppy disk body 31
Can be protected from dust and external impact and can be transported safely.

FIG. 3C is a diagram for explaining recording and reproducing of a program on a floppy disk. By connecting the floppy disk drive 34 to the computer system 35 as shown in the drawing, it is possible to record and reproduce programs on the floppy disk 30. The floppy disk 30 is inserted into and removed from the floppy disk drive 34 via the floppy disk insertion slot 33. If you want to record,
A program is supplied from the computer system 35 to the floppy disk 30 by the floppy disk drive 34.
To record. For reproduction, the floppy disk drive 34 reads the program from the floppy disk 30 and transfers it to the computer system 35.

In this embodiment, the description has been made using the floppy disk 30 as a recording medium. However, the present invention can be similarly performed using an optical disk. The recording medium is not limited to these, but can be similarly implemented as long as the program can be recorded thereon, such as an IC card or a ROM cassette.

[0032]

As is apparent from the above description, the first data transmission apparatus of the present invention eliminates the need to decompose received data into bits, rearrange the bits, and perform a transmission error check for each bit. Therefore, speedup can be achieved not only in data restoration but also in transmission error detection.

Further, the second data transmission device of the present invention comprises:
Although the first data transmission device uses a bi-phase code, the bi-phase code is a data sequence having no DC component because data is inverted and sent twice, so that data transmission is not performed. High reliability because it is suitable and transmission errors can be detected regardless of the number of errors, but data transmission because transmission error information must be detected by finding the exclusive OR for each bit when recovering data. Since it takes time to detect the transmission error and the transmission error detection, the advantage obtained by greatly speeding up the data restoration and the detection of the transmission error is very large.

Further, the third data transmission apparatus is one in which wireless communication is applied to the first data transmission apparatus. However, the reliability of wireless transmission is lower than that of wired transmission, and transmission errors frequently occur. However, the advantages of the data restoration and transmission error detection provided by the greatly increased speed are very large.

Further, the data transmission method of the present invention eliminates the necessity of decomposing the received data into bits, rearranging the bits, and performing a transmission error check for each bit. Higher speed can be achieved.

Further, the recording medium of the present invention achieves high speed in data restoration and transmission error detection, and has improved distribution and storage.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a data transmission device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the table calling unit.

FIG. 3A shows an example of a physical format of a floppy disk which is a recording medium main body in which a data transmission method according to an embodiment of the present invention is recorded. FIG. 3B shows a case in which the floppy disk is stored. (C) is a diagram for explaining that a program is recorded and reproduced on the floppy disk.

FIG. 4 is a diagram showing an example of 4-bit transmission data.

FIG. 5 is a diagram showing a configuration of a conventional data transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 2 Receiver 3 Control part 4 Encoding part 5 Transmitting part 6 Receiving part 10 Control part 11 Restoration data 12 Transmission error information 13 Wired 17 Memory 18 Address 20 Table calling part 21 Bi-phase code of all patterns of 8 bits 22 NRZ code

Claims (5)

[Claims] A transmitting unit that encodes data to be transmitted into a code including error information and transmits the encoded data; and a receiving unit that receives the encoded data and performs data restoration and transmission error detection. A data transmission device, wherein the reception unit includes a memory unit in which restored data and transmission error information corresponding to the encoded data are tabulated. 2. The data transmission apparatus according to claim 1, wherein a bi-phase code is used as the code including the error information. 3. The data transmission device according to claim 1, wherein wireless communication is performed between the transmission unit and the reception unit. 4. A first step of encoding data to be transmitted into a code including error information and transmitting the encoded data, a second step of receiving the encoded data, and a plurality of steps using the received data. And a third step of performing data restoration and transmission error detection by referring to a memory section in which restored data and transmission error information corresponding to the encoded data are tabulated. 5. A program for performing data restoration and transmission error detection with reference to a memory unit in which restored data corresponding to a plurality of encoded data and transmission error information are tabulated using the received data. The recording medium on which it was recorded.