JPH02205164A - Communication equipment - Google Patents

Abstract

PURPOSE:To prevent a transmission error from being outputted as it is by checking the transmission error of a DTMF signal expressing received character information by using identification information for checking the transmission error. CONSTITUTION:The sum of numerical values showing a message to be transmitted is transmitted from a transmission side by the DTMF signal and compared with the sum of the numerical values showing the really received message in a reception side. Only when these sums are coincident, the message is outputted. Accordingly, only the exactly transmitted message can be recorded and outputted. Since re-transmission can be requested to the transmission side in case the transmission error is generated, the message can be received without fail.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a communication device, particularly a communication device connected to a telephone line, and a DTMF
The present invention relates to a communication device that transmits and receives character information using signals.

[Prior Art 1] Conventionally, facsimile devices have been known that transmit and receive character codes using DTMF signals, in addition to transmitting and receiving facsimile procedure signals and image signals.

In this type of device, when a character code is received by a DTMF signal or the like, the received character is displayed or recorded using corresponding font data.

[Problem to be Solved by the Invention] However, devices that transmit and receive character codes as described above usually do not perform error detection and display or record and output the received code as is, so transmission errors etc. are output as is. There was a problem with being exposed.

The object of the present invention is to solve the above problems.

[Means to solve the problem]

In order to solve the above problems, in the present invention, in a communication device connected to a telephone line and transmitting/receiving character information using DTMF signals, a method for checking transmission errors of DTMF signals expressing character information to be transmitted to a transmitting device is provided. A configuration is adopted in which a means is provided for transmitting the identification information of the receiver, and a means is provided for checking transmission errors of the DTMF signal representing the received character information using the identification information received by the receiving device for checking transmission errors. did.

[Operation] According to the above configuration, it is possible to exchange information for checking transmission errors of character information transmitted and received between the transmitting and receiving devices, and to identify transmission errors of character information.

[Example 1] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a block diagram showing a telephone integrated facsimile device according to an embodiment of the present invention.
controls the entire device and is operated by software stored in ROM 2, RAM 3, non-volatile RAM 4, keyboard 5, storage section 6, voice recording control section 7° DTMF signal detection section 9, NCU 16, selection Signal sending section 12, speaker control section 13, password storage section 14
, the modem section 18, and the reading section 19.

Further, the CPUI encodes and decodes image data. The encoding and decoding formats in this embodiment include, for example, the modified Huffman (MH) method and the modified read (MR) method.

ROM2 stores various data and programs necessary for controlling this facsimile machine, especially the DA described later.
A conversion table (Fig. 5) between MF signals and JIS character codes is stored.

The RAM 3 stores data from the reading section 19 and holds data to be transferred to the recording section 6.

The non-volatile RAM 4 is for storing data that should be preserved even when the system is powered off.

The keyboard 5 consists of a numeric keypad used for sending selection signals and various mode buttons, and its status is constantly monitored by the CPU 1.

The recording unit 6 consists of a thermal head and its controller, and is controlled by the CPU 1 to store RAM 3, non-volatile R
It has a function of extracting memory data stored in the AM and recording and outputting it as a hard copy.

The audio recording control section 7 is controlled by the CPU 1 and the transmitter/receiver 11
and the analog input signal from the line control unit IO to the ADM
(audio compression) method, converts it into a 1-bit digital signal, and stores it in the DRAM 8.
It also has a function of converting the information stored in the DRAM 8 into an analog signal under the control of the CPUI, sending it to the handset 11 and speaker control section 13 via the line control section 10, and outputting it to the operator.

The DTMF signal detection unit 9 receives the signal from the time 1i11 via the NCU 16.
It has a function of detecting the DTMF signal from 7 and the DTMF signal from the selection signal sending unit 12 as necessary, and notifying the CPUI of the values.

The line control unit 10 controls the NCU under the control of the CPU t.
16, a voice recording control section 7, a DTMF signal detection section 9, a handset 11. It controls whether or not the selection signal sending unit 12 and the telephone line 17 are connected.

The NCU 16 controls a transformer to separate and separate the primary and secondary sides of the telephone line 17, and also separates input and output using a hybrid circuit or the like, and outputs this to the line control unit 1O.

The handset 11 connects to the telephone via the line control unit 10 by hooking up! 117 and the voice from the voice recording control section 7, and conversely, the function of transmitting the voice.

The selection signal sending unit 12 sends a dial pulse type signal of "0" to "9" and rO according to the data from CPtJl.
J~ "9", "*", and "#" signals of the button type are sent out, and both types are switched.

The speaker control unit 13 is connected to the line control unit 10 by the CPU
This is to control whether or not the output is output from the speaker 15.

The password storage section 14 consists of two rotary lip switches, and the CPU 1 refers to the values.

The modem section 18 modulates the transmission data, which is composed of G3, G2, G1% FM modems, a block generation circuit input to the modem, etc., and outputs it to the telephone line 1117 via the line control section 10 and NCU 16. An analog signal from the telephone line 17 is inputted via the NCU 16 and the line control unit 10, and the demodulated and binarized data is stored in the RAM 3.

The reading unit 19 is composed of a CCD, TTLIC, etc., and is configured to binarize the data read by the CCD under the control of the CPU and sequentially store the values in the RAM 3.

Figures 2 to 4 show the operation of the facsimile machine configured as described above in the message mode, that is, the mode in which a voice band signal (DTMF signal in this example) is received from a terminal other than the facsimile machine and recorded and output. It is a flowchart figure shown. It is assumed that the procedures shown in FIGS. 2 to 4 are stored in the ROM 2 as a CPU control program.

The procedures in Figures 2 to 4 comply with CCITT Recommendation T.

30, and in the same way as normal facsimile receiving operations, NCU 16 first receives the CI double signal, then returns an identification signal to the calling party, and receives a response signal in response. This is for selecting the above message mode.

That is, in this embodiment, as shown in FIG. 2, the DTMF "#" signal is detected twice in succession in place of the response signal in step Sl, thereby transitioning to the message mode in step S2. If step St is negative, known operations such as image transmission and reception are performed in step S3.

In the message mode of step S2, the received Dr! 1
Message input processing is performed to store the 4F signal in RAM3. The message mode processing in step S2 is shown in FIG.

In step Sll of FIG. 3, a timer is set to 10 seconds as the maximum waiting time for the DTMF signal. Then, in step S12, if this waiting time times out,
In step S19, the CML relay of the NCU 16 is turned off to disconnect the telephone line 17 from the facsimile machine.

In addition, if a DTMF signal is received before the waiting time elapses in step S13, it is confirmed in steps S14 and S15 that this is not a "#" signal twice in succession, and then this DTMF signal is sent to a predetermined address in RAM3 in step S16. The values are sequentially read out, the sum is stored at a predetermined address, and this sum is defined as sum l.

Specifically, "0" to "9" of the DTMF signal are stored in RAM3 as numerical values as they are, "*" is stored as A, "#
" is converted to B and stored in RAM3.

Then, in step S17, the address of RAM3 is set to 1.
Then, the process returns to step Sll and the DTMF signal input process is repeated. As a result, a code string of data from "0" to r13J is stored in the RAM 3.

Further, if it is determined in step S15 that the signal is a "#" signal twice in succession, the end code data FFH is stored in the RAM 3 in step 318, and the end code data FFH is stored in the RAM 3 in step S15.
While detecting two consecutive "#" in steps 9 to S22 as described above, the DTMF input in steps S23 and S24 is detected.
The signals are stored in the lower addresses of the RAM in the order of input, and the group of numerical values starting from the most significant one is made into a sum of 2.

Then, in step S25, the aforementioned sum 1 and sum 2 are compared, and if they are equal, the CML relay is turned off in step S27, and the message is recorded and output. If they are not equal, in step 326, the voice recording control unit 7 sends a prerecorded message to the line, such as "Please re-enter the message," to notify the operator at the other end.

When the message input process is completed as described above, the next message inputted manually is recorded and outputted, and the output process is shown in FIG.

In step S21 in FIG. 4, the code string stored in the RAM 3 is first read out and converted into a JIS code corresponding to the combination of DTMF signals.

This process consists of two consecutive high-order DTMF code strings,
For lower numbers, 20H (H indicates hexadecimal) ~
This is done using a conversion table that corresponds to the DFH JIS code as shown in FIG. This table is RO
It is stored in advance in M2.

As shown in FIG. 5, in this embodiment, 128 pieces of manual data corresponding to the keys of the keyboard 5 are created by combining 11 pieces of upper data (0-AH) and 12 pieces of lower data (0-BH). Convert to 2-digit code data and convert it to DT
It is designed to convert into an MF signal. Codes * and # are assigned to AH and BH.

When the JIS code corresponding to the DTMF signal is determined in this way, this JIS code is converted into character data based on the CG data stored in the ROM 2 in step S22, and is recorded line by line by the recording section 6.
Output.

FIG. 6 is a schematic diagram showing the correspondence between a DTMF signal and a character into which this DTMF signal is finally converted by the above processing.

As shown in this figure, the received DTMF signal is finally converted into predetermined characters and output for recording. therefore,
For example, a message can be easily sent from an external public telephone to a facsimile machine for output.

Also, according to the procedure shown in FIG. 3, the transmitting side transmits the sum of numerical values indicating the message transmitted by the DTMF signal,
Compare with the sum of the numerical values indicating the messages actually received on the receiving side +4- (Step 525 in Figure 3) 1. Since the message is output only when these match, only messages that have been accurately transmitted can be recorded and output.

Furthermore, if a transmission error occurs, the sender can be requested to retransmit, so the message can be reliably received.

Although a facsimile machine has been exemplified above, it goes without saying that the above technique can also be implemented when a message received using a DTMF signal is displayed in a telephone or the like having a display device.

In the above embodiment, since the character of one finger is expressed by two digits of DTMF signal, a correspondence table like the one shown in Fig. 6 is required when using a normal numeric keypad. A keyboard with a JIS layout or the like may be used, and a combination of upper and lower DTMF signals as shown in FIG. 5 or 6 may be generated in response to input from the keyboard.

An embodiment of a transmitting side device capable of inputting such a message is shown in FIG. 7 and subsequent figures.

FIG. 7 is a block diagram showing the hardware configuration of a message input device according to an embodiment of the present invention.

This message input device is stored, for example, in a calculator-shaped portable case (not shown), and has a CPU of 71%.
It has a ROM 72, a RAM 73, a DTMF conversion section 74, an operation section 75, a display section 76, and a transmission section 77, and converts message data input from the operation section 75 into a DTMF signal and sends it to the telephone line.

The CPU 71 controls the entire device based on the program stored in the ROM 72, and in particular controls the RA.
M73, DTMF conversion section 74, operation section 755 display section 76
, controls the transmitter 77.

The ROM 72 stores various data and programs necessary for controlling this device, and in particular input character data is stored in the ROM 72.
A conversion table for converting data into TMF signal data is stored.

The RAM 73 is used to write or output various data according to the operation of the CPU 71.

The DTMF conversion unit 74 converts input character data into a unique code for a TMF signal based on a conversion table stored in the ROM 72.

The operation unit 75 is a key-operated unit consisting of a character key, a shift key, a transmission key, etc. in a predetermined arrangement.
Desired characters can be entered using the character and shift keys.

The display unit 76 is, for example, a liquid crystal display that displays 20 digits, and displays predetermined characters and symbols under the control of the CPU 71.

The transmitting section 77 has a configuration as a speaker, and the operating section 75
DT! when the send key is pressed. It amplifies and outputs the l/IF signal.

FIG. 8 shows a flowchart showing the basic operation of this message input device. The procedure shown in FIG. 8 is stored in the ROM 72 as a control program for the CPU 71.

First, in step S81 in FIG. 8, various constants are initialized by turning on the power, for example. In this state, the message input waiting state is entered, and in step S82, the operation unit 7
Enter the message using 5. As a result, in step S83, the message input subroutine and the DTM
A subroutine for converting to an F signal and transmitting it is executed,
Terminates message sending operation.

FIG. 9 is a flowchart showing the message input processing subroutine of step S82 in FIG.

In this subroutine, step S84 in FIG.
First, initial settings for this subroutine are performed, and if a message is input in step S85, the input contents are sequentially output to the display section 76 in step S86.

Then, in step S87, this input data is stored in the RAM.
73, and when the send key is pressed in step S88, the message manual processing ends.

FIG. 1O is a flowchart showing the DTMF signal conversion and transmission subroutine of step S83 in FIG.

First, initial setting of this subroutine is performed in step S89 of FIG.
Read input data one byte at a time. Then, the data read in step S91 is converted into a DTMF signal using the conversion table shown in FIG. 5 (assumed to be stored in the ROM 72).

Then, the DTMF signal converted in step S91 is sequentially outputted from the transmitter 77. During this conversion and transmission, the sum of the transmitted data is added to a predetermined area of the RAM 73 one digit at a time.

When all message data is completed in 92, the process moves to step S93.

Further, in this embodiment, the sum of the values is calculated while outputting data in step S91, and after all messages are output in step S92, D
Two TMF "#" signals are output, the final value of the sum of the transmission data calculated in step S91 is output in step S94, and two "#" signals are transmitted in step S95, and the process ends.

According to the above configuration, by converting a message input by key operation into a TMF signal and outputting it, a public telephone, for example, can call the other party's facsimile device, and the message input device can be used to transmit the DTMF signal to the handset of the public telephone. By sending the DTMF signal to the other party's facsimile machine, the receiving side can reconvert the DTMF signal into characters and output it.

Therefore, this message input device does not require a modem or the like to transmit a message over a telephone line, and can be constructed as an inexpensive and compact device.

[Effects of the Invention] As is clear from the above, according to the present invention, in a communication device that is connected to a telephone line and transmits and receives character information using DTMF signals, it is possible to transmit a DTMF signal expressing character information to be transmitted to a transmitting device. A means for transmitting identification information for error checking is provided, and a means for checking transmission errors of a DTMF signal representing received character information using the identification information for transmission error checking received by the receiving device is provided. Since the system adopts a configuration that allows for checking for errors in the transmission of character information sent and received between transmitting and receiving devices, it is possible to identify transmission errors in character information.
This has the excellent effect of allowing text information to be sent and received reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a facsimile device adopting the present invention, FIGS. 2 to 4 are flowcharts showing the communication control procedure of the device in FIG. 1, and FIGS. 5 and 6 are DTMF signals and messages. An explanatory diagram showing the correspondence between codes, FIG. 7 is a block diagram showing the structure of the message input device used on the sending side, and FIGS. 8 to 10 are flowcharts showing the communication control procedure of the device in FIG. 7. It is a diagram. ■...-CPU 2--ROM3...RAM
4...Nonvolatile RAM5...Keyboard 6...Recording unit 7...Audio recording control unit 8...DRAM 9...DTMF signal detection unit 10...Line control unit 11...Transmission Receiver 12...
Selection signal sending unit 13...Speaker control unit 14...Password storage unit 15...Speaker 16.
...NCU l 7...Telephone line 18...Modem section 71...CPU 73...RAM 75...Operation section 77...Transmission section

Claims (1)

[Claims] 1) In a communication device connected to a telephone line and transmitting/receiving character information using DTMF signals, a means for transmitting identification information for checking transmission errors of DTMF signals representing character information to be transmitted to the transmitting device is provided, and a means for receiving A communication device comprising means for checking transmission errors of a DTMF signal expressing received character information using the identification information for transmission error checking received by the device.