JPS62193352A - Data transmission equipment - Google Patents

Abstract

PURPOSE:To obtain accurate character information by ignoring the first dial signal out of received dial signals if one dial signal is inserted or deleted during data transmission because of noise, occasional disconnection, or the like. CONSTITUTION:If an operator in the reception side watches an output device 5 to find a character string whose meaning is indistinct, he depresses a correction key provided in an input device 1 used for transmission. Then, a correction control circuit 11 ignores the first dial signal out of at least one-message components of dial signal stored in a buffer 7 and reads out the second and following dial signals and supplies them to a character generating circuit 6. The character generating circuit 6 receives supplied dial signals and converts them to corresponding character information, and characters, symbols, etc., corresponding to character information are outputted to an output device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission device that transmits character information using a telephone line.

[Prior Art] Recently, the dial signal (θ
~9. *, #, A-D) systems for data transmission have come into widespread use. A typical example is seat reservations on Japanese National Railways. Using this system, when a user inputs a dial signal via a telephone according to instructions from the receiver, the receiver can determine the information and automatically reserve a seat.

By the way, these dial signals have four types of low group frequencies (897, 770, 852) as shown in the table shown in Figure 7.
, 94111z) and four types of high group frequencies (1209
, 133B, 1447, 1ft33Hz). Therefore, 16 ways of data transmission are possible.

When a dial key is pressed on the transmitting side using such a telephone, a frequency signal is generated that is a combination of the low group and high group frequencies corresponding to the dial signal. On the receiving side, the information can be determined by converting the frequency signal arriving via the telephone line into a dial signal.

[Problems to be Solved by the Invention] In the data transmission using the dial signal of the telephone, as described above, only 16a of information can be transmitted. Therefore, by combining two dial signals to express one piece of information, a large amount of information (162
-256 ways) can be considered.

However, in such a data transmission device, one character information is expressed by two dial signals, so if one dial signal is inserted or deleted due to noise or occasional interruption during data transmission, the receiving side may Data after the inserted or deleted dial signal becomes meaningless character information, making accurate reception impossible.

The present invention has a simple configuration, and when one dial is inserted or deleted, it is easy to decipher meaningless character information after that dial signal, and it is possible to obtain accurate character information except for the deleted or inserted part. The purpose is to provide a possible data transmission device.

[Means for resolving the problem] When one dial signal is inserted or deleted, the fundamental reason why the data after that dial signal becomes meaningless character information is that two dial signals contain one character. Since it represents information, this is due to the fact that after one dial signal is inserted or deleted, the dial signals shift one by one.

If you ignore the first dial signal of the received dial signals, the dial signals will shift one by one.
Discrepancies in dial signals after insertion or deletion are corrected, and accurate character information can be obtained.

From this viewpoint, the present invention provides a data transmission device that transmits data using a telephone line, which includes an input device for inputting character information, and a combination of two dial signals for the character information input from this input device. A code generation circuit that converts and outputs code information, a DTMF generator that generates frequency signals corresponding to each of the two dial signals output from this code generation circuit, and a dial signal that converts the frequency signal arriving via the telephone line into a dial signal. a DTMF receiver that converts and outputs the dial signal; a buffer into which the dial signal output from the DTMF receiver is written;
a character generation circuit that sequentially reads dial signals stored in the buffer and converts code information that is a combination thereof into corresponding character information; an output device that outputs the character information; and a character generation circuit that outputs the character information; When the operator sees it and the dial signal becomes undecipherable, the first dial signal stored in the buffer is ignored based on the operator's instructions, and the dial signals continuously stored thereafter are sequentially read out and supplied to the character generation circuit. The present invention is characterized by being provided with a correction control circuit.

[Operation] In the device configured as described above, when character information is input from the input device during transmission, the input character information is converted by the code generation circuit into code information that is a combination of two dial signals and is output. . Then, the DTMF generator generates and outputs frequency signals corresponding to each of the dial signals output from the code generation circuit. On the other hand, during reception, a frequency signal arriving via a telephone line is converted into a dial signal by a DTMF receiver and output. The dial signal output from this DTMF receiver is written into a buffer. The character generation circuit then reads the dial signals stored in this buffer and converts code information, which is a combination thereof, into corresponding character information. Furthermore, the converted character information is outputted by an output device. When the operator looks at this output and finds that it cannot be deciphered, the operator can input “
Indicate correction degree. Based on this instruction, the correction control circuit ignores the first dial signal stored in the buffer, and thereafter sequentially reads out the continuously stored dial signals and sends them to the character generation circuit. The character generation circuit similarly converts code information, which is a combination of dial signals, into corresponding character information in accordance with the dial signals supplied from the correction control circuit.

The output device then outputs this character information. The operator can obtain accurate character information by comparing the output content before correction and the output content after correction.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The sending side has an input device 1 equipped with a keyboard on which keys for characters, symbols, etc. are arranged, and the character information inputted from this input device 1 is converted into code information that is a combination of dial signals using a built-in code conversion table. 1 chip C
It consists of a code generation circuit 2 equipped with a PU, a DTMF generator 3 that converts a dial signal output from the code generation circuit 2 into a frequency signal, and a transmission circuit 4 consisting of an amplifier, a filter, etc. Here, the DTMF generator 3 generates low group and high group frequency signals corresponding to the dial signal by dividing a certain fundamental frequency signal, and synthesizes and outputs the two frequency signals.

On the receiving side, a receiving circuit 9 consisting of an amplifier, a filter, etc.
A DTMF receiver 8 that converts the frequency signal adjusted through this receiving circuit into a dial signal, a buffer 7 into which the dial signal outputted from this DTMF receiver 8 is written, and a dial signal stored in this buffer 7 is sequentially read out, A character generation circuit 6 equipped with a 1-chip CPU that converts code information that is a combination of these into character information using a built-in character conversion table, and characters, symbols, etc. corresponding to the character information output by this character generation circuit 6. An output device 5 equipped with a printer or LCD (liquid crystal display) that outputs It is comprised of a correction control circuit 11 that sequentially reads signals and supplies them to the character generation circuit 6. Here, the DTMF receiver 8 divides the input frequency signal into high group and low group frequency signals by passing it through a plurality of filters, and outputs a dial signal from a combination of these two frequency signals. The transmitter and receiver are connected to a telephone line via a hybrid circuit 10 that controls the direction of transmitted and received signals.

Below, the table shown in Fig. 2 and the table shown in Fig. 3 will explain the operation of this embodiment.
This will be explained in detail with reference to the drawings and the flowchart shown in FIG. The table in Figure 2 is an example of expressing one character information by combining two dial signals. 16 types of dial signals are arranged in each row and column, and each character information is divided into a matrix created by these. This is what I put on it. For example, the character information "a" is expressed by a combination of dial signals "1" and "1".

First, the operation on the transmitting side will be explained with reference to the flowchart shown in FIG. When character information is input from the input device 1 (301, 302), the code generation circuit 2
According to the table in the figure, the input character information is converted into two dial signals for rows and columns and output (303). Next, D.T.
The MF generator 3 sends out a frequency signal corresponding to the row dial signal (304). Subsequently, the DTMF generator 3 sends out a frequency signal corresponding to the column dial signal (805).

These frequency signals are amplified and otherwise adjusted by the transmitting circuit 4 and sent to the telephone line via the hybrid circuit 1o (30G). Then, the transmission activity ends when the input of character information for at least one message is completed (307).

Next, the operation on the receiving side will be explained with reference to the flowchart shown in FIG. A frequency signal that has arrived via the telephone line is sent to the receiving circuit 9 by the hybrid circuit 1o, and is subjected to adjustments such as amplification (401). And D.T.
The MF receiver 8 receives a frequency signal corresponding to the row dial signal via this receiving circuit 9 (402, 40
3) and outputs a dial signal corresponding to this frequency signal (404). This dial signal is written into the buffer 7 under the control of the character generation circuit 6 (405). Subsequently, the DTMF receiver 8 receives a frequency signal corresponding to the column dial signal via the receiving circuit 9 (408, 40
7) and outputs a dial signal corresponding to this frequency signal (40g). This dial signal is written into the buffer 7 under the control of the character generation circuit 6 (409). Next, the character generation circuit 6 reads the row and column dial signals from the buffer 7 and converts them into corresponding character information according to the second chart (410). Further, under the control of the character generation circuit 6, characters, symbols, etc. corresponding to the character information are outputted to the output device 5 such as a printer or LCD (411). and,
A character string for at least one message is output (41
2) and the reception operation ends. Here, the operator on the receiving side looks at the output device 5 and determines whether there is any meaningless character string (413).

If there are no meaningless character strings, there is no need to make corrections and the process ends here. On the other hand, if there is a character string that does not make sense, the user presses the "correction" key provided on the input device 1 used for transmission (414). As a result, the correction control circuit If ignores the first dial signal among the dial signals for at least one message stored in the buffer 7, reads the dial signal from the second dial signal, and supplies it to the character generation circuit 6 (415 '). The character generation circuit 6 receives the supplied dial signal and converts it into corresponding character information according to the table shown in FIG. 2 (410). Then, characters, symbols, etc. corresponding to the character information are output to the output device 5 (417).
. A character string for at least one message is output (4
18) and the correction operation ends. The operator on the receiving side can obtain accurate character information by comparing the character string corrected in this way with the character string before correction.

Hereinafter, a case in which one dial signal is deleted will be specifically explained with reference to the output example shown in FIG.

Suppose that the transmitting side tries to send the character string "Ashitaren Rakushimasu" of the character information A, but the frequency signal corresponding to the dial signal "1" in the string representing the character information "ra" is deleted. On the receiving side, since one dial signal is deleted, the deleted previous dial signal is shifted and an output like character information B is obtained. The operator interprets this as a meaningless character string and instructs correction by operating the input device 1. Then, since the first dial signal "1" is ignored, a character string such as character information C is obtained. The operator can easily infer the character information by comparing the character information C and the character information B. Furthermore, although the description has been made using short character strings, the present invention is particularly effective for long character strings.

Figure 6 is an application example where the present invention is applied to a terminal.
Reference numeral 1 is a dial signal input key used as a normal button telephone. Reference numeral 72 is an input key for inputting character information when transmitting data. In addition, “MobiKi-7” on the bottom right
21 is a key for instructing the start of transmission of character information. A "correction" key 722 at the bottom right is a key for instructing correction. 7
Reference numeral 3 denotes an LCD on which character information input from a character input key 72 is displayed, and 74 a printer for outputting the received character information. It goes without saying that this terminal incorporates the circuit configuration shown in FIG.

Note that the present invention is not limited to the above embodiments,
A buffer is provided on the transmitting side to hold at least 11 messages of the dial signal output by the code generation circuit 2, and after setting the dial signal for at least one message,
The transmission time can be shortened by reading dial signals from this buffer in the order of transmission start and sending them to the DTMF generator 3. In addition, in the embodiment described below, the character generation circuit 6
A correction control circuit U is installed independently from the 1-chip CPU built into the
However, the 1-chip CP built into the character generation circuit 6
A means for ignoring the first dial signal of the buffer 7 and reading from the second dial signal may be added to U.

[Effects of the Invention] As described above, according to the present invention, during data transmission,
If one dial signal is inserted or deleted due to noise, occasional disconnection, etc., the first dial signal of the received dial signals is ignored, so the dial signals are shifted one by one, and subsequent dials after the insertion or deletion are ignored. The signal deviation is corrected and accurate character information can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a data transmission device according to the present invention, FIG. 2 is a diagram showing a code table in which dial signals are combined to realize the present invention, and FIGS.
The figures are flowcharts showing the operations on the transmitting side and the receiving side, respectively. Fig. 5 is an output example using the present invention. Fig. 6 is an application example in which the present invention is applied to a terminal. Fig. 7 is a conventional button dial signal. FIG. 3 is a diagram showing a table of frequencies corresponding to . 1... Input device 2... Code generation circuit 3... DTMF generator 5... Output device 6... Character generation circuit 7... Bale buffer 8... DTMF receiver 11... Correction control circuit Representative Patent Attorney Kensuke Norichika Representative Patent Attorney Sanno - Figure 1 Figure 2 Figure 3 Figure 4

Claims (5)

[Claims] (1) A data transmission device that transmits data using a telephone line includes an input device for inputting character information, and converts the character information input from the input device into code information that is a combination of two dial signals and outputs it. and a DT that generates frequency signals corresponding to each of the two dial signals output from the code generation circuit.
MF (Dual Tone Multi-Freque
(ncy) generator, a DTMF receiver that converts a frequency signal arriving via a telephone line into a dial signal and outputs it, a buffer into which the dial signal output from the DTMF receiver is written, and a dial signal stored in the buffer. a character generation circuit that sequentially reads and converts the code information that is a combination thereof into corresponding character information; an output device that outputs the character information converted by the character generation circuit; and an operator who outputs the content output by the input device. correction control that ignores the first dial signal stored in the buffer based on an operator's instruction, reads successively stored dial signals sequentially, and supplies the read signals to the character generation circuit when the dial signal becomes undecipherable. A data transmission device comprising a circuit. (2) The code generation circuit controls a memory in which code information corresponding to character information is set, and reads code information corresponding to character information inputted from the input device from the memory and sequentially sends it to the DTMF generator. 2. A data transmission device according to claim 1, comprising a circuit. (3) The code generation circuit further includes a buffer that temporarily holds code information for at least one message inputted and converted from the input device, and after setting the code information for at least one message in the buffer, sequentially 3. The data transmission device according to claim 2, wherein the data transmission device reads and sends the read data to the DTMF generator. (4) The character generation circuit sequentially reads dial signals stored in a memory in which character information corresponding to the code information is set and the buffer, and generates character information corresponding to the code information by combining them from the memory. 2. The data transmission device according to claim 1, further comprising a control circuit for reading data and sequentially sending data to said output device. (5) The character generation circuit further reads out character information corresponding to the combined code information from the memory in accordance with the dial signal supplied from the correction control circuit, and sequentially sends the character information to the output device. A data transmission device according to claim 4.