JPS63292765A - Communication system for facsimile equipment - Google Patents

Abstract

PURPOSE:To easily execute an operation at the time of a transmission by deciding whether a transmitting destination is a common facsimile equipment or the facsimile equipment of a moving body based on a transmitting destination telephone number and executing a prescribed transmitting control procedure suitable thereto. CONSTITUTION:A communication procedure control part 10 executes the ordinary transmitting control procedure to the general facsimile equipment and executes the transmitting control procedure suitable for a radio line to the facsimile equipment disposed on the moving body such as car telephone. At the time of the transmission, whether the transmitting destination is the general facsimile equipment or the facsimile equipment of the moving body in a telephone number discriminating part 13 based on the transmitting destination telephone number to execute the prescribed transmitting control procedure. Thereby, the operation at the time of the transmission is easily and effectively executed to transmit picture information.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a communication system for facsimile machines.

[Prior Art] In recent years, car phones have become popular, and facsimile communications using car phones have come to be carried out. In this case, the calling side and the called side are connected via a general public telephone line and a wireless line.

By the way, wireless lines are susceptible to external noise and the radio wave condition fluctuates due to fading, etc., so data errors in transmitted data are likely to occur, resulting in poor communication quality.

For this reason, CCITY used in general subscriber telephone lines
In a normal facsimile machine that complies with the G3 standard that complies with the recommendation, errors may occur in the transmission control procedure, and there is a problem in that image information cannot be transmitted reliably.

On the other hand, in a dedicated wireless facsimile device that connects a facsimile device and a wireless device, a facsimile device for a wireless line is used that executes non-standard transmission control with less trouble caused by transmission data errors. Therefore, such a wireless line facsimile device can be attached to a car phone and used.

For such a wireless line facsimile machine and a normal facsimile machine connected to a general subscriber telephone line, if one of the destinations is a normal facsimile machine, the If the destination is a wireless line facsimile device, it is necessary to use two different devices depending on the destination, such as using a wireless line facsimile device. For this reason, there is a problem in that the operation for selecting a device when making a call becomes cumbersome.

[Objective] In view of the above-mentioned problems, it is an object of the present invention to provide a communication method for a facsimile device that is easy to operate when making a call and can reliably transmit image information.

[Configuration] For this reason, the present invention is configured such that a general facsimile machine executes a normal transmission control procedure, and a facsimile machine installed in a mobile body such as a car phone executes a transmission control procedure suitable for a wireless line. On the other hand, when making a call, it is determined whether the destination is a general facsimile machine or a facsimile machine of the above-mentioned mobile body based on the optical telephone number of the outgoing caller, and a predetermined transmission control procedure is executed. It is.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a facsimile device 1 according to an embodiment of the present invention.
This figure shows a block diagram of the system.

In the figure, a reading unit 2 reads an image of a transmission document and extracts image information. The line buffer 3 temporarily stores one line of extracted image information. C0DEC (encoding/decoding unit) 4 is CCITT
It encodes image information to be transmitted and decodes image information received in accordance with the recommended G3 standard. The line buffer 5 temporarily stores one line of received image information, and the recording section 6 records the image information on recording paper.

The buffer 7 temporarily stores image information to be transmitted or received image information. The modem 8 includes a low-speed modem 8a that transmits transmission procedure signals and a high-speed modem 8b that transmits image information.

The procedure signal detection unit 9 detects the procedure signal received by the low-speed modem 8a, and the communication procedure control unit 10 controls the low-speed modem 8a based on the detection result and executes a predetermined transmission control procedure. be. The communication procedure control unit 10 of this embodiment has a function of selectively performing transmission control using standard procedure signals that comply with CCITT Recommendation T and 30 standards and transmission control using non-standard procedure signals, which will be described later. have.

The NCU (network control unit) 11 performs outgoing operations such as seizing a line and sending out a selection signal that is a dial number, and detects incoming calls and performs incoming calls.

The operation display section 12 is used to display the operation guidance 9, input the calling optical telephone number, and give an instruction to start the apparatus. The telephone number discriminator 13 discriminates from the input telephone number whether the destination is a normal telephone line or a car telephone line.

The system control unit 14 controls one or more units and executes predetermined image transmission.

FIG. 2 shows the system configuration of the facsimile system of this embodiment. In the figure, the above-mentioned facsimile machine 1 is connected to a subscriber telephone line of a telephone office 15.

The telephone office 15 is connected to another telephone office 17 via a public telephone line network 16, and a facsimile machine 18 is connected to the subscriber telephone line of the telephone office 17.

This facsimile device 18 is a general facsimile device that complies with the CCITT Recommendation G3 standard.

A mobile phone radio station 19 is connected to the telephone station 17 . The facsimile device 20 is a wireless line facsimile device that is connected to a car telephone and transmits image information using a non-standard transmission control procedure.

With the above configuration, when transmitting a document using the facsimile device 1, the document to be transmitted is first set on the reading section 2, the destination telephone number is input on the operation display section 12, and then a startup operation is performed.

As a result, each section is activated under the control of the system control section 14, and a predetermined call processing is performed in accordance with the input destination telephone number.

By the way, if the destination is a regular subscriber telephone line, the telephone number is composed of area code - city code - subscriber number, for example 03-555-5555, but if the destination is a car phone Case 1 For example, 040-31-555
55, a 3-digit number indicating that it is a car phone, a 2-digit area number, and a 5-digit subscriber number.

The telephone number discriminator 13 identifies the first three digits of the input destination telephone number and determines whether the destination is a normal telephone line or a car phone line. Here, if it is determined that the destination is a normal telephone line, the communication procedure control unit 10
Execute standard transmission control procedures in accordance with CITT Recommendation T.30 standards.

That is, if a call is made to a facsimile machine 18 connected to a normal telephone line, as shown in FIG. called,
The receiving side RX receives the call and sends out a CED signal and a DIS signal to notify its own functions.

Note that the CHD signal is a 2100 Hz tone signal. Further, the DIS signal is a signal in which digital data indicating various information is FSK-modulated in a certain format and transmitted, and includes DC3, CFR, and EOP, which will be explained below.

The procedure signals of MCF and DCN are also transmitted in the same way.

After receiving and determining these CED and DIS signals, the originating side TX transmits a DC5 signal to instruct the transmission mode, and subsequently transmits a signal MT for modem training. This modem training signal is normally one in which "1" and "10" are alternately sent out for a certain period of time. The receiving side RX receives this, determines whether transmission is possible, and if transmission is possible, determines the internal state and then sends out a CFR signal indicating reception is possible.

When the transmitting side TX receives this, it encodes the image information read out by the reading section 2 and sends it out. and.

An EOP signal is sent at the end of this image information. Receiving side RX
receives the transmitted image information and records and outputs it.

When the EOP signal is received, the MC indicates normal reception.
Sends F signal.

When the originating side TX receives the MCF signal, it ends the transmission process and sends out the DCN signal to restore the line.

Upon receiving this DCN signal, the receiving side RX ends the receiving process and restores the line.

Next, when the telephone number discriminator 13 determines that the line is a car telephone line, the communication procedure control section 1o executes the following non-standard transmission control procedure.

That is, if a call is now made to the facsimile machine 2o, as shown in FIG. , CHD signal and DIS' signal to notify the function of the own device.

Here, the CHD signal is the same signal as in the case of FIG. 3 above. However, as shown in FIG. 5(a), the D
Assuming that the digital data transmitted by the IS signal is 8-bit data d1 to d, in this case, the DIS' signal transmits 4 bits of the same digital data, as shown in FIG.
It is transmitted as 4 bits each time.

In addition, on the receiving side of the procedure signal, if there are two or more ``1''s for each 4-bit data, it is determined that the transmitted information is actually ``1'', and in other cases is determined to be 70''.

Note that the next transmitted DC5', CFR', EOP
The procedure signals of ', MCF', and DCN' are similarly transmitted and determined in the same way.

In this way, the facsimile machine 1 which is the originating side TX
and the facsimile machine 20 which is the receiving side RX, as shown in FIG.
It transmits and receives procedure signals for each of CF' and DCN'.

Further, the modem training signal MT is as shown in FIG. 6(a).
As shown in Fig. 2, '1' and '0' were sent out alternately, whereas the modem training signal MT' in this case is all '0' as shown in Fig. '' signal, and during modem training, for example, when 2 bytes of all ``O'' data is detected, it is determined that transmission is possible.

The encoding method for the image information is the same as described above, and the image information is transmitted in the same procedure as shown in FIG. 3 using the above-mentioned procedure signals.

As described above, according to this embodiment, as shown in FIG. 5, one bit of information in a procedure signal is transmitted as 4-bit data between the facsimile machine and the facsimile device connected to the car telephone. When two or more bits of the data are "1", the receiving side executes a non-standard transmission control procedure that determines that the data is "1".

In the case of a car phone, since the data is transmitted via a wireless line, errors in the transmitted data are likely to occur due to external noise and fading, but in the above case, 1 bit out of 4 bits is in error and the 1" and 0" are reversed. Even if this occurs, correct information can be received, so correct transmission control without errors can be performed and image information can be reliably transmitted.

Additionally, when performing outgoing processing from the facsimile device 1,
Based on the input destination telephone number, it is determined whether the destination facsimile device is a normal facsimile device or a car phone facsimile device, and in the latter case, the above-mentioned non-standard transmission control is executed. ing.

This eliminates the troublesome operation of installing two facsimile machines, one for a normal facsimile machine and one for a car phone, and switching between them to use one on the calling side.

In addition, as shown in FIG. 6, the signal MT' for modem training has a data pattern of all "0"s, so it is easy to detect on the receiving side, and it is simply a 2-byte all "0" data pattern. Since it is determined that transmission is possible when `` is detected, image information can be transmitted even under conditions where the frequency of data errors is higher and the communication quality is poorer than with a normal line.

In addition, in the above embodiment, each procedure signal simply transmits the same bit four times, and when two or more bits are "1", it is actually "1".
However, a known error correction code system 1, such as the BC) 1 system, a burst error correction code system, or the like may be applied. It goes without saying that the signal pattern for modem training and the method for determining whether transmission is possible can be set arbitrarily.

Furthermore, in the above-mentioned embodiment, image information is transmitted using the same encoding method both in the normal case and in the case of a car phone, but in the case of a car phone, it is not encoded as in the G2 standard. It is also possible to reduce the influence of data errors by transmitting data in this way.

Furthermore, in the above embodiment, although the case where the facsimile machine 1 receives a call is not explained, the NSF signal and NSS signal etc. prepared in the T, 30 standard are used to It is conceivable to switch the procedure signals.

It goes without saying that the present invention is not limited to G3 standard facsimile machines, but can be widely applied to G4 and other general facsimile machines. Furthermore.

It goes without saying that the present invention is applicable not only to car telephones but also to marine telephones and the like.

[Effects] As described above, according to the present invention, it is determined whether a destination is a general facsimile device or a mobile facsimile device based on the destination telephone number, and a predetermined facsimile device suitable for each destination is determined. Since the transmission control procedure is now executed, there is no need to switch the device used when making a call, making operation easier. Therefore, image information can be transmitted reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a facsimile device according to an embodiment of the present invention, FIG. 2 is a block diagram of a facsimile system using the facsimile device, and FIG. 3 is a typical facsimile system connected to a subscriber telephone line. Fig. 4 is an explanatory diagram of the transmission control procedure executed with the facsimile machine connected to the car telephone, and Fig. 5 is an explanatory diagram of the transmission control procedure executed with the facsimile machine connected to the car telephone. Explanatory diagrams, FIGS. 6(a) and 6(b) are explanatory diagrams of modem training signals. 1.18.20...Facsimile device, 2...Reading unit, 3.5...Line buffer, 4...C0DEC
(encoding and decoding unit), 6... recording unit, 7... buffer, 8... modem. 8a...Low speed modem, 8b...High speed modem, 9...
- Procedure signal detection section, 10... Communication procedure control section, 11.
...NCU (network control unit t), 12...operation display unit, 13...telephone number discrimination unit, 14...system control unit, 15.17...telephone office, 16...public telephone Line network, 19...radio station.

Claims (1)

[Claims] In the communication method of a facsimile device that makes a call to a wired facsimile device connected to a subscriber telephone line via a public telephone line and a wireless facsimile device connected to a mobile radio telephone, the wired facsimile device A wired transmission control means executes a normal transmission control procedure for the device, and a wireless transmission control means executes a transmission control procedure suitable for a wireless line for the wireless facsimile device, and when a call is made, the normal transmission A communication system for a facsimile machine, characterized in that it selects whether to execute a control procedure or a transmission control procedure suitable for the wireless line, depending on a destination telephone number.