JPH04133567A - Method for controlling modem rate of facsimile equipment - Google Patents

Abstract

PURPOSE:To reduce the number of signal delivering and receiving times required for establishing the training of a MODEM and to shorten communication time by informing the communication MODEM rate which is the optimum for the communication with registered specific equipment when communication is made with the specific equipment so that the MODEM rate can be precisely lowered at call originating side equipment. CONSTITUTION:A specific equipment registering area 31 is provided in a RAM 3 and a TSI registering area 32 for registering the TSI of specific equipment, MODEM rate storing area 33 for registering MODEM rate information used at the time of communication with each specific equipment in corresponding to each specific equipment of the TSI registering area, and optimum MODEM rate registering area 34 for registering the optimum MODEM rate calculated based on the information in the area 33 are provided in the area 31. When the communication partner is the specific equipment at the time of transmission, the registered optimum MODEM rate is selected by referring to the area 34. Therefore, the training of the MODEM rate used for communicating with the communication partner can be established at a high speed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a modem rate control method for a digital facsimile device that performs synchronous transmission using a modem, and in particular, the present invention relates to a modem rate control method for a digital facsimile device that performs synchronous transmission using a modem. The present invention relates to a modem rate control method for a facsimile machine suitable for selecting a modem rate (transmission speed) and a line and performing efficient communication with reduced communication time.

[Background Art] In the current information society, facsimile machines are widely used as information communication means that can communicate image information.

The transmission method of digital G3 facsimile equipment is a synchronous transmission method using a modem, and the transmission speed is 2400.
, 4800.7200.9600°12.0, 14.
4 kbit/s (bits per second) is used. Furthermore, G4 facsimile machines use a modem rate (transmission speed) of 9600 bit/s or higher.

In addition, binary (B 1nar
y) There is a procedure.

Since the binary procedure performs transmission M control using code transmission, it has a wide range of functions and can perform complex control.

The following is an explanation of the binary procedure for facsimile machines, edited by the Institute of Electronics, Information and Communication Engineers, "Electronic, Information and Communication Handbook J.
(1988, published by Ohmsha), pp. 2609~
Based on the contents described in 2611, this is done using figures.

FIG. 6 is an explanatory diagram showing the basic protocol elements and signal sequences of the binary procedure.

In the binary procedure, HDLC (High Level D) is used to encode protocol elements and send and receive them accurately.
ATA Link Control) frame structure is used. Here, the HDLC procedure is one of the transmission control procedures used for computer communication, and is superior in terms of transmission efficiency, improved reliability, and compatibility with computers, etc., and is premised on synchronous data transmission. Control messages and data are transmitted and received in frames (in data communication, a bit string containing information is transmitted by adding specific characters or codes before and after it; the unit is called a frame, and the whole frame is synchronization.The format and configuration for transmission are JIS (J
apanI industrial S tanda
rds).

The identifiers of the protocol elements shown in this figure are contained in the facsimile control field and the facsimile information field provided in the information field of the HDLC frame.

And these control signals are basically 300bi
t/s modem.

The operation of transmitting and receiving control signals between the transmitting side and the receiving side will be described below.

First, when the receiving side receives a "call" from the sending side, it sends a CED signal indicating that it is connected to a non-telephone device, and then sends a DIS signal to determine the attributes of its own terminal, such as resolution and paper size. Notice.

The transmitting side refers to this DIS signal and specifies terminal constants to be used for subsequent communication using the DC3 signal. This DC
3 signal, a high-speed modem training signal for transmitting facsimile messages, and a TCP signal to check it. On the receiving side, if the high-speed modem training is successful,
It responds with a CFR signal indicating that operation has been established.

Based on the second CFR signal, the transmitting side starts transmitting a facsimile signal using a high-speed modem, and notifies the end of transmitting the facsimile signal by an EOP signal indicating the end of transmitting the facsimile signal.

When the reception is completed, the receiving side responds with an MCF signal indicating normal reception, and then performs the "call" disconnection procedure in response to the DCN signal from the transmitting side indicating disconnection of the line, and ends the transmission. .

It should be noted that facsimile messages are not formed into HDLC frames, but encoded signals are divided into lines and sent out sequentially.

In this way, the 03 facsimile device on the receiving side performs synchronization control based on the modem rate (transmission speed) from the sending side, matches the modem rate, and adjusts the modem rate (transmission rate).
facsimile messages are received at the transmission speed).

Conventional technologies that control modem rates (transmission speeds) include the rA1 short program, which stores a history of communication conditions with the other party and uses that information to omit pre-transmission procedures. There are some that learn modem rates. This allows selection of the optimum modem rate.

Furthermore, for example, as described in Japanese Patent Application Laid-Open No. 64-243771, there is a method in which the communication route is changed in advance depending on the line condition to the other party.

[Problem to be Solved by the Invention] In the conventional modem rate control method of a facsimile machine, the modem training signal from the transmitting side device is
It is sent according to the type of modem rate of the highest speed from the receiving device.

In addition, if the line condition is poor, the modem rate of the modem training signal at which synchronized operation can be established becomes considerably low.

In such cases, with conventional modem rate control methods, the FTT (Failure
To Train: Training failure) signal,
The transmission and reception of the modem training signal in response to this FTT signal is repeated, which takes time.

Further, in the conventional method of controlling the modem rate of a facsimile machine, it is not possible to select the modem rate by the receiving side apparatus depending on a specific destination.

The purpose of the present invention is to solve the problems of the prior art, quickly determine the optimum modem rate for communication with the destination device, shorten the time required for modem training operation, and reduce the amount of information to be transmitted. An object of the present invention is to provide a modem rate control method for a facsimile machine with high communication efficiency, which selects a line so as to transmit at an optimum modem rate based on the above, and reduces the cost required for communication.

[Means to solve the problem]

In order to achieve the above object, the modem rate control method for a facsimile device of the present invention provides (1) a facsimile device that performs facsimile communication over a telephone network using a binary procedure, and arbitrarily selects and specifies a plurality of communication devices to be communicated with; It is registered as a communication device, and the modem rate used when communicating with each specific communication device is stored for each communication, and based on the modem rate recorded for each communication, the modem rate for each specific communication device is stored. The optimum modem rate is calculated and stored, and when receiving from a specific communication device, it is detected that the sending device is a specific communication device, and the modem training signal from this specific communication device and the calculated and stored optimum modem rate are Based on the modem rate, the type of modem rate that is most suitable for communication with this specific communication device is selected and sent to this specific communication device, and based on the modem training signal from the specific communication device that corresponds to the type of modem rate sent out. When performing a synchronous operation and transmitting to a specific communication device, the receiving device detects that it is a specific communication device, and calculates the highest modem rate based on the type of notification from this specific communication device. It is characterized by selecting the stored optimum modem rate and transmitting it to a specific communication device.

(2) In the modem rate control method for a facsimile machine described in (1) above, the method further includes a storage and transmission control section that stores image information and transmits the stored image information via an arbitrarily selected line. When transmitting this accumulated image information, the amount of image information is memorized, and the connection time required from the start of the call on the arbitrarily selected line to the final frame of the DrS signal is measured and stored, Based on the synchronization failure information received from the destination receiving device via the line, the time required for transmission via the arbitrarily selected line at the next modem rate selected for the next modem training is calculated. Calculated by dividing the amount of image information by the next modem rate, and if the required transmission time exceeds a threshold arbitrarily determined based on the required connection time, the line is switched an arbitrarily determined number of times. It is characterized by doing.

[Operation] In the present invention, an arbitrarily specified communication destination is registered in a facsimile device, and furthermore, the modem used is stored as communication history data for each communication with the registered device, and, Based on this communication history data, the optimum modem rate for each specific device is calculated and stored.

Then, when communicating with a registered specific device, the optimum communication modem rate for communicating with this specific device is notified, allowing the transmitting device to accurately downshift the modem rate.

This makes it possible to reduce the number of times signals are exchanged to establish training of the modem, thereby shortening the communication time.

Furthermore, in a device that performs transmission using the storage communication function, if the sending device cannot establish synchronization with the receiving device using the transmitted modem training signal, it will be able to Based on the time, it is determined whether to shift down the modem rate and continue communication using the same line, or to switch the connection to a new line and start communication.

This allows efficient transmission.

At this time, remember the number of times the line has been switched,
It also makes it possible to prevent excessive line switching, thereby shortening the total communication time.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the configuration of a facsimile apparatus according to the present invention.

The facsimile device of this embodiment includes a main control unit 1 that controls the operation of the entire device, a scanner 2 that reads a document and inputs image information, and a RAM (RAM) that stores image information from the scanner 2.
andom Access Memory.

ROM (read-only memory) 3, which stores operating programs of the main control unit 1, etc.
(read-only memory) 4, a keyboard 5 for inputting the operator's transmission operations, an LCD (Liquid
Crystal Display, liquid crystal display) 6, operation port 7 consisting of a keyboard 5 and LCD 6, NCU (NetWork Control L'ni) that controls communication of image information stored in RAM 3.
t, network control device) 9, modem 8 that modulates the image information stored in the RAM 3 into a communication signal and sends it to the NCU, NCtJ
9, a plotter 10 that prints out image information input from other facsimile devices via the modem 8, a main control section 1, a scanner 2, an operation boat 7, and a plotter 10.
It is composed of an I10 interface 11 that controls connections with other devices.

In this embodiment, a specific device registration area 31 is provided in the RAM 3, and this specific device registration area 31 includes the following:
To identify a specific device, the TSI of the specific device
(Transmitting Subscription
er Identification: a transmitting terminal identification signal, 20 digits);
A modem rate storage area 33 in which modem rate information used during each communication is registered corresponding to each specific device in this TSI registration area 32, and 'T:
Each specific device of the S:fM router 32 is provided with an optimum modem rate registration area 34 in which the optimum modem rate calculated based on the information in the modem rate storage area 33 is registered.

The main control unit l also includes a CPU (CentralPr), not shown, which controls the operation of the entire facsimile machine.
a specific device detection unit 102 that refers to the TSI registration area 32 of the specific device registration area 31 and detects whether or not the communication destination device is a specific device; and a modem rate storage area 33.
The optimum modem rate calculation/registration processing unit 103 calculates the optimum modem rate and stores it in the optimum modem rate registration area 34 based on the information in the above information. Refer to the registration area 34, select the registered optimal modem rate,
The optimum modem rate selection/sending unit 104 sends the data to the specific device of the communication destination, and if the communication destination is a specific device at the time of reception, the optimum modem rate corresponding to the optimum modem rate in the optimum modem rate registration area 34, LA, -N types and sends them to a specified device as a communication destination, and includes a modem rate control gI 1101 for each specific device that performs modem rate control according to the present invention.

With such a configuration, the facsimile apparatus of this embodiment quickly establishes training of the modem rate used for communication with the other party's apparatus.

That is, the operator specifies the communication destination device via the keyboard 5 and registers it in the TSI registration area 32 of the RAM 3.

If the other party's device that communicates with the NCU 9 via the modem 8 is registered in this TSI registration area 32, the modem rate control according to the present invention is performed, and the actually used modem rate is changed to correspond to this TSI. , is stored in the modem rate storage area 33.

Modem rate control according to the present invention as a receiving side device will be explained below.

First, in response to a "call" from the transmitting device, the modem 8 is used to send the type of modem rate that is the fastest among available modem rates to the transmitting device along with a CED signal.

Currently, the types of modem rates (transmission speeds) that can be used with modems are 14.4k to 12°0k (V
, 33), 9.6k ~ 7.2k (V29), 4°8
There are types of k to 2.4 k (V27 ter).

The rate of transmission together with the CED signal is rV,
33J, rV29J, or rV27terJ.

In addition, here, rV, 33J, rV29'', ``■27L
erJ means CCI T T (I internal
ional Telegraph and Te
1ephone Con5ultative Co
mmottee) is a standard for editing and demodulating equipment recommended by
This shows the difference in modulation methods.

On the other hand, the CED signal and rV, 33J, rV29''
, rV27terJ, the sending device receives the modem rate corresponding to the received rate type (such as 14,4 kbit/s, etc.).
actual rate) as a modem training signal.

The synchronization establishment operation is performed based on this training signal, and at this time, the facsimile apparatus of this embodiment searches for the specific device registration area 31 in RAMa based on the TSI signal from the transmitting side apparatus.

That is, the specific device detection unit 102 searches the TSI registration area 32 and detects that the transmitting device is a specific device. Then, the optimum modem rate type selection/sending section 10
In step 5, the type of optimum modem rate, for example rV, 33J, is selected and sent based on the data in the optimum modem rate registration area 34 of the identified specific device.

The type of modem rate that has been sent is sent to the sending device via the modem 8 and NCU 9, and the next modem training signal from the sending device based on this modem rate type will always be able to establish synchronization. .

Note that when communication is actually possible, the modem rate at that time is stored in the modem rate storage area 33.

In the second manner, this embodiment eliminates the need for unnecessary downshifting of the modem rate during reception.

Next, modem rate control according to the present invention as a transmitting side device will be explained.

First, from the receiving device via the NCU 9 and modem 8,
rV, 33J, rV29j, or rV27ter" and receives the CED signal at the highest rate available to the receiving device's modem.

Then, the optimum modem rate selection/sending section 104 performs
The specific device detection unit 102 searches the TSI registration area 32 and selects the optimum modem rate 3 corresponding to the detected receiving device.
4, the optimum modem rate is selected and sent.

In this way, in the facsimile device of this embodiment, when transmitting, if the receiving device is a specific device that has been registered in advance, modem training is performed to determine the optimal modem rate based on the historical data of the modem rate used in previous communications. Send for personal use. This allows the modem training establishment operation of the receiving side device to be performed efficiently.

In addition, in the embodiment of the wood brush 1, the modem rate storage area 33
Based on the data, the optimum modem rate is determined in advance and registered in the optimum modem rate registration area 34, but even if the optimum modem rate registration area 34 is not used, for example,
A similar effect can be obtained by calculating the optimum modem rate from the data in the modem rate storage area 33 for each communication.

Further, the optimum modem rate type may be recorded in advance for each specific device.

The processing operation of the facsimile machine shown in FIG. 1 according to the present invention will be explained in more detail below.

FIG. 2 is a flowchart showing an embodiment of the processing operation of the facsimile machine shown in FIG. 1 according to the present invention.

Indicates operation of modem rate control during reception, and
Instead of using the optimum modem rate registration area 34 in FIG. 1, the optimum modem rate is determined each time there is communication based on the data in the modem rate storage area 33.

First, after receiving a call, set the highest modem rate of the own device to the CE
D. DI S/N5Fl (a signal informing the calling side'aaii) and sends it (step 20I).

DCS sent from the other device (CCITT specifications, a signal that informs the sender setup data) + TSI
, or receive N5S (a signal unique to this embodiment and informing transmitting side setup data) of N5S (TSr) (step 202), the received DCS, or NSS.
The transmission modem rate (hereinafter referred to as TXRT) is read out and stored (step 203).

Check the "presence" of the setting for whether or not to restrict incoming calls (step 204). If "no", 5TRT (a flag indicating whether or not to register the final rate in the destination modem rate area after communication ends). , "0" not to register, "1" to register) should be set to "0" (step 2o5), TX
Based on RT (transmission modem rate), modem training (step 2I3) and image information reception are performed (step 214).

If the setting is F, TSI or N5S (TS
A check is made as to whether or not I) has been received from the partner device (step 206).

If received, check whether the TSI is registered in the communication destination registration area 31 in FIG. 1 (step 2).
07). Here, if it is not registered and if the TSI is not received in step 206,
Step 20: Send DCN (D1 connect, signal for switching from facsimile to 1i conversation).
9), the line is disconnected (step 225).

In step 207, if the TSI is registered in the TSI registration area 32 of the communication destination registration area 31 in FIG. 1, rlJ is set in 5TRT (step 208), and the TSI registration in FIG. Area 32
Data regarding the modem rate is read out from the modem rate storage area 33 corresponding to the modem rate (step 210).

Based on this read data, it is determined whether or not there is a communication history (step 211). If there is a communication history, the optimum rate (hereinafter referred to as TRX) is determined based on the communication modem rate data.
RT) is calculated and stored (step 212).
. If there is no communication history, modem training (step 213) and image information reception are performed as usual (step 213).
Step 214), and if 5TRT is "1" (step 215), the final rate is registered in the modem rate storage area 33 corresponding to the destination device (step 217), and the line is disconnected (step 225).

In step 212, TRXRT (optimal modem rate)
If TXRT is stored, TXRT and TRXRT are compared (step 216), and if TXRT is smaller but equal, training is accepted (step 218), and then the training result is determined (step 21).
9) e If the training result is OK (established), proceed to step 2.
The image information reception processing after step 14 is performed, and if NG (failed), the FTT is sent (step 220), and the process returns to step 202.

In step 216, if TXRT is larger, a modem training signal is received (step 221), and then it is determined whether the modem types declared by the partner device to DC3 or NSS are the same (step 222).
,.

If there is no change, send the FTT (step 224)
, and then returns to step 202. Also, if there is a change, please enter the changed modem type in DIS or NSF.
It is declared and sent (step 223).

In this way, according to this embodiment,! ! It is possible to select a modem type based on the recorded optimal modem rate, notify the transmitting device, and obtain a modem training signal with an appropriate rate from the transmitting device.

This eliminates unnecessary system down protocols and shortens the total communication time.

Furthermore, since the type of modem is changed on the receiving device, the protocol can be shortened without having to specifically select the destination device.

FIG. 3 is an explanatory diagram showing an embodiment of the difference between the modem rate control operation of the facsimile apparatus in FIG. 1 and the modem rate control operation of the conventional facsimile apparatus.

In particular, it shows the modem rate control operation during reception, declares the modem rate rV, 33J, and finally 4
．． It shows the procedure until synchronization is established with an 8 kbit/s modem training signal.

FIG. 3(a) shows the modem rate control operation of a conventional facsimile machine, in which the CED signal and
Sends NSF%DIS signal, modem rate rV, 33
Declare J.

From the sending device, rl4,4kbit is sent by NSS.
A modem training signal of /sJ is sent out, but synchronization is not established, and an FTT signal is sent out, followed by a request to send out a high-speed modem training signal.

This time, from the sending device, rl
2. A modem training signal of Okb i t/sJ is sent out, but synchronization is not established again, an FTT signal is sent out, and the next higher speed modem training signal is requested to be sent out.

This operation is repeated, and finally, synchronization is established (CFR) by a modem training signal of r4, 8 kbit/sJ from the transmitting side device, and facsimile message (Fax) communication is performed.

On the other hand, FIG. 3(b) shows the modem rate control operation of the facsimile apparatus of FIG.

Similarly to FIG. 3(a), in response to a "call", the CED signal, NSF, and DIS signals are sent, and the modem rate rV,
33J, the sending device sends rl 4,4
A modem training signal for kb it/SJ is sent out.

The facsimile device shown in FIG. 1 selects the optimum modem rate "v, 27ter4" based on the communication history with the sending device and sends it.

The transmitting side device sends out a modem training signal of r4, 8 kbit/SJ based on the modem rate rV, 27 terJ. This modem training signal establishes synchronization (CFR), so facsimile messages (F
a x) communication is performed.

In this way, in the present embodiment, the modem training signal can be changed by -degrees based on the type of modem rate, whereas conventionally the modem training signal has been changed many times based on the FTT signal.

Next, a second embodiment of the present invention will be explained.

FIG. 4 is a block diagram showing a second embodiment of the present invention of a facsimile machine to which the present invention is applied.

In the facsimile machine shown in Fig. 1, modem rate control operation at the time of transmission and line switching control are also taken into consideration.
Furthermore, it is efficient.

The configuration of the facsimile apparatus of this embodiment is almost the same as that of the facsimile apparatus shown in FIG. A ROM 4 that stores the operation program of the unit 1, a keyboard 5 that inputs the operator's transmission operation, and an L that displays the operating status of the device.
It consists of an operation port 1ll (+7) consisting of a CD 6, an NCU 9 and a modem 8 that perform communication control, a plotter 10 that prints out the received image information, and an interface 11 that controls the connection between the main control section 41 and each section. is,
The image information stored in the RAM 43 is transmitted to the receiving device registered by speed dialing.

In the second embodiment of this year, the RAM 43 has the following information:
Specific device registration area 31 and TS1 registration area 3 in Figure 1
2. Modem rate storage area 33 for each communication, optimal modem rate registration #! In addition to the section 34, there is a transmission information amount storage area 35 that stores the amount of accumulated image information for transmission, a connection time storage area 36 that stores the connection time required for connection using a certain line, and A memory file 431 is provided for use when transmitting each piece of information.

This memory file 431 also includes a file number 432 that is a management number of information to be stored and transmitted, a destination area 433 that indicates the destination, a memory pointer 434 that is a pointer to image information data, and a line for one transmission. A line switching number registration unit 435 is provided to register the number of times the line has been switched.

Furthermore, the main control section 41 includes the specific device detection section 1 shown in FIG.
02. In addition to the modem rate control unit 101 for each specific device, which consists of an optimal modem rate calculation/registration processing unit 103, an optimal modem rate selection/sending unit 104, and an optimal modem rate type selection/sending unit 105, a transmission information amount storage area 3
A transmission time calculation unit 106 calculates the transmission time required for each modem rate by dividing the amount of transmission information stored in 5 by each modem rate used at the time of transmission; The difference in the transmission time required for each modem rate calculated by the connection time measurement unit 107 and the transmission time calculation unit 106, which measure the amount of information, is compared with the connection time stored in the connection time storage area 36. an information amount determination unit 108 that determines the size;
Then, the line switching determining unit 1 refers to the line switching number registration unit 435 in the RAM 43 and controls the final line switching.
A line switching control section 110 consisting of 09 is provided.

With this configuration, the facsimile machine of the second embodiment of this year can establish a high-speed modem rate using the facsimile machine shown in Fig. 1, and can also support the optimum modem rate 1, especially during transmission. The facsimile communication is performed at higher speeds in total by switching the lines.

That is, when transmitting stored image information specified by the memory pointer 434, first specify it by the file number 432 of the memory file 431, and then make a call to the receiving device based on the destination area 433 corresponding to the file number 432. Start.

At this time, the connection time measurement unit 107 measures the time from the start of the call on the selected line to the reception of the last frame of the DIS signal from the receiving device, and calculates the time required for connection on this line as the connection time. The required time is stored in the required time storage area 36.

Further, the amount of accumulated image information is stored in the transmission information amount storage area 35.

Then, the type of the fastest modem rate received from the receiving device in the destination area 433 and the optimum modem rate registration unit 3
4, the optimum modem rate selection/sending unit 104 selects the optimum modem rate for the receiving side device, and sends it to the receiving side device as a modem training signal via the modem 8 and NCU 9. .

At this time, the required transmission time calculation unit 106 calculates and stores the required transmission time using this optimum modem rate.

The required transmission time (XT) from the amount of information at each modem rate by the transmission required time calculation unit 106 is calculated as follows.

XT (sec) = Original amount (total number of bits) = Modem rate (bit/s) For example, if the data amount (original amount) is 2000 bits and the modem rate is 7200 bits/s,
T=2000÷7200#0,2778 (sec).

If the training of the modem at the receiving side device using the second optimum modem rate has not been established, the transmission time calculation unit 106 further determines that the modem rate (slower than the optimum modem rate) used for the next training is established. Calculate the time required for transmission on the same line.

Then, the information amount determination unit 108 calculates the difference between the transmission time required for the same line using the modem rate used for the next training calculated by the transmission time calculation unit 106 and the transmission time required for the previous optimal modem rate. Calculate,
The required connection time stored in the connection required time storage area 36 is compared.

If the difference between the transmission time on the same line using the modem rate used for the next training and the transmission time using the previous optimal modem rate is small and smaller than the connection time, then the amount of information is small. Therefore, the next modem rate is sent without switching the line.

However, if the time required to transmit on the same line using the modem rate used for the next training is large, and the difference between the time required to transmit using the previous optimal modem rate and the time required for connection is greater than the required connection time, the amount of information may be large, and the speed will be slow. It is determined that transmitting at the second modem rate would take too much time, so the line is switched without changing the modem rate.

At this time, if a connection at the optimal modem rate is not established even if you switch lines, try switching to the next line in the same way.
Switch over and over again.

However, switching the line many times will result in a decrease in the total communication speed, so the line switching determination unit 109 selects the line switching frequency registration unit 435.
Switching shall not be performed more than the number of times registered in .

In other words, if the line has been switched for the number of times registered in the line switching frequency registration section 435, the line will not be switched after that and the modem rate will be changed (downshifted).
Connect by.

In this way, the facsimile machine of the embodiment of Woodstroke 2 transmits the registered optimum modem rate at the time of transmission, thereby aiming to quickly establish modem training of the receiving side apparatus, and also controlling the amount of information to be transmitted. By switching the line accordingly, modem training of the receiving device can be established more quickly.

The processing operation of the facsimile machine shown in FIG. 4 according to the present invention will be described below using a flowchart.

FIG. 5 is a flowchart showing an embodiment of the processing operation of the facsimile machine shown in FIG. 4 according to the present invention.

In the case of memory transmission (transmission of stored information) to a registered destination (memory abbreviation transmission), the destination number is called based on the destination area 433 of the memory file 431 in Fig. 4. N sent from the receiving side for
When SF and DIS are received (step 301), the time (CTTIM) required from calling the destination number to completion of receiving the last frame of CED% NSF and DIS of the destination device is measured (step 3o2).

The highest modem rate RXRT of the receiving device is DIS,
Obtained from NSF and memorized (step 303), and checks whether memory shortened transmission is performed (step 304).
).

If it is a memory-reduced transmission, that is, if it is a transmission to a specific device, see the modem rate storage area 33 of the specific device registration area 31 in FIG. 4 (step 305), and check whether there is a communication history (step 306). ).

If there is no communication history, conventional transmission is performed at the modem rate corresponding to the highest modem rate RXRT (step 307), and the process is terminated. , and the modem rate storage area 33 in FIG.
XRT is selected (step 308).

The required transmission time TLTIM is calculated from the selected optimal modem rate TRXRT and the amount of information stored in the transmission information amount storage area 35 in FIG. 4 (step 309).

Also, depending on the selected modem rate TRXRT, NSS
, DIS, and send TCP (step 310)
, waits for a response (modem training establishment/denial establishment response) from the receiving device (step 311).

Receive the response and check if the response is OK (established) or N
It is confirmed whether the result is G (no probability) (step 312).

If the response is OK, the image information is transmitted based on the optimal modem rate TRXRT selected in step 308 (step 314), and the line switching frequency registration section 435 in FIG. 4 is cleared, that is, set to rOJ (step 314). 315), this optimum modem rate TRXRT is stored in the modem rate storage area 33 in FIG. 4 (step 316), and the process ends.

On the other hand, if the response from the receiving device is NG (FTT signal received), the amount of information of the document stored in the memory stored in the transmission information amount storage area 35 and the next modem in the modem rate storage area 33 in FIG. The required transmission time is calculated from the rate and stored as NXTIM (step 313).

Then, the required transmission time NXT based on this next modem rate
IM, the required transmission time TLTIM at the optimal modem rate calculated in step 309, and (7[(NXT IM
-TLT IM) and CTT measured in step 3°2.
Difference with IM (NXT IM-TLT IM-CTT I
M) is calculated in step 317).

If the value of (NXTIM-TLTIM) is less than or equal to CTTIM, return to step 310;
If it is larger than IM, the number of switching times RTNUM registered in the line switching number registration section 435 in the memory file 431 is read out (step 318).

The number of switching times RTNUM read here is compared with X, which is a value that defines the permissible number of times of line switching (step 319). If the number of switching times RTNUM is equal to but larger than the permissible number of times X, the process returns to step 310 and the modem Transmit at a lower rate (shift down).

If the number of switching times RTNUM is smaller than the allowable number of times X, the number of switching times RTNUM is counted up by one (step 320), and the counted up number of switching times R
T N U M is registered in the line switching frequency registration section 435 of the memory file 431 in FIG. 4 (step 321
). Then, send the DCN to the partner device (step 3
22), disconnect the line, interrupt transmission, and change to another line (step 323), return to step 301, and attempt transmission on the new line.

In this way, according to this embodiment, when communicating, for example, when the line is connected to a busy line during a busy time period and a line in poor condition is selected, the amount of documents to be transmitted is large. You can reconnect the line and switch to a line in good condition to communicate.

In addition, for documents with a small amount of information, the transmission time difference between the next connection and the next connection is calculated, and the selection is made based on the total communication time.

As explained above using Figures 1 to 5,
According to the second embodiment, when receiving, the type of modem rate based on the optimum modem rate is notified to the transmitting device, and unnecessary modem rate system down is avoided, and the transmitting device can select the appropriate rate. modem training signal can be obtained. Also, when sending, the receiving device will receive the message from the beginning! & send suitable modem rate, and furthermore,
Depending on the amount of information to be transmitted, it determines whether to downshift the modem rate or switch lines, and performs transmission over the optimum line and at the optimum modem rate.

In this way, the total communication time can be shortened.

〔Effect of the invention〕

According to the present invention, the optimum modem rate for communication with a communication destination device is determined in a short time, the time required for modem training operation is shortened, and transmission is performed at the optimum modem rate based on the amount of information to be transmitted. By selecting a line in such a way as to reduce the cost required for communication, efficient facsimile communication can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the configuration of a facsimile device according to the present invention, and FIG. 2 is an example of the processing operation of the facsimile device shown in FIG. 1 according to the present invention. FIG. 3 is an explanatory diagram showing an embodiment of the difference between the modem rate control operation of the facsimile machine in FIG. 1 and the modem rate control operation of a conventional facsimile machine, and FIG. A block diagram showing a second embodiment of the facsimile device according to the present invention, FIG. 5 is a flowchart showing an example of the processing operation of the facsimile device in FIG. 4 according to the present invention, and FIG. 6 is a conventional facsimile device. FIG. 2 is an explanatory diagram showing the basic protocol elements and signal sequences of the binary procedure of FIG. l: Main control unit, 2: Scanner, 3: RAM, 4: R
OM, 5: Keyboard, 6: LCD, 7: Operation board, 8: Modem, 9: NCU. lO: Protuter, ll: I10 interface. 31.Specific device registration area, 32.TSI registration area,
33 Modem rate storage area, 34: J & appropriate modem rate! ! ! Recording section, 35 Transmission information amount storage area, 36.
Connection required time storage area, 41゛ Main control unit, 43: RA
M, 101: Modem rate control unit for specific device, 102
：Specific device detection unit, 103, optimum modem rate calculation/registration processing unit, 104: optimum modem rate selection/sending unit, 1
05・Optimum modem rate type selection/sending unit, 106: Required transmission time calculation unit, 107: Required connection time measurement unit, 10
8 Information amount determination unit, 109: Line switching determination unit. 10: Line switching control unit, 431: Memory file,
432: File number, 433 + destination area, 434:
Memory pointer, 435: Line switching number registration unit. figure (bl [call] 臥

Claims (2)

[Claims] (1) A facsimile device that performs facsimile communication over a telephone network using a binary procedure, which responds to calls from the sending device, and uses a CED signal indicating that it is a non-telephone device, and a modem with the highest speed that can be used by the device itself. The transmission side device transmits a modem training signal of a lower speed sequentially until a synchronized operation is established based on a modem training signal from the transmission side device according to the type of modem rate and the CED signal. In a method for controlling a modem rate of a facsimile device, the modem rate control method for a facsimile device includes requesting a modem rate of a facsimile device, transmitting an operation establishment response signal to the sending device after establishing the synchronized operation, and receiving a facsimile message from the sending device. are arbitrarily selected and registered as specific communication devices, and for each specific communication device, the modem rate used when communicating with each specific communication device is stored and recorded for each communication. Based on the modem rate, calculate and store the optimal modem rate for each specific communication device, and when receiving from the specific communication device, detect that the sending device is the specific communication device, and Based on the modem training signals of Performing the synchronization operation based on a modem training signal from the specific communication device according to the type of modem rate, and when transmitting to the specific communication device, detecting that the receiving device is the specific communication device, A modem rate of a facsimile device, characterized in that the optimum modem rate calculated and stored is selected and transmitted to the specific communication device based on the notification of the type of the fastest modem rate from the specific communication device. Control method. (2) The modem rate control method for a facsimile apparatus according to claim (1), further comprising storage and transmission control means for storing image information and transmitting the stored image information via an arbitrarily selected line; When transmitting the accumulated image information, the amount of information of the image information is memorized, and the required connection time from the start of the call on the arbitrarily selected line to the final frame of the DIS signal is measured and memorized; Transmission time required for transmission via the above arbitrarily selected line at the next modem rate selected for the next modem training based on the synchronization failure information received from the destination receiving device via an arbitrary line. The time is calculated by dividing the amount of image information by the next modem rate, and if the required time for transmission exceeds a threshold arbitrarily determined based on the required connection time,
A modem rate control method for a facsimile machine, characterized in that lines are switched a predetermined number of times.