JPH05199387A - Communication start speed control method - Google Patents

Abstract

PURPOSE:To reduce the time up to the establishment of a communication speed with respect to the communication start speed control method in which a communication sender 1 and a communication destination 2 start communication at a common highest speed among plural communication speeds. CONSTITUTION:A communication sender 1 calls a communication destination 2 to receive a communication speed capability of the communication destination 2 and sends a training signal by selecting a common highest speed between the communication speed capability of the communication sender 1 and the communication speed capability of the communication destination 2, and decreases the communication speed by one step upon the receipt of disable training from the communication destination 2 and then sends the training signal at the decreased speed and sends data at a communication speed as the result of receiving the excellent training from the communication destination 2. In such a communication system, the preceding communication speed of the communication destination 2 is registered and the communication sender 1 uses the registered communication speed for the communication destination 2 as the communication start speed.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Prior Art (FIG. 4) Problem to be Solved by the Invention Means for Solving the Problem (FIG. 1) Action Example (a) Description of One Example (FIG. 2) To FIG. 3) (b) Description of another embodiment Effect of the invention

[0002]

BACKGROUND OF THE INVENTION In the present invention, a communication source and a communication destination are
The present invention relates to a communication start speed control method for starting communication at a common maximum speed among a plurality of communication speeds.

Communication using a public line is widely used in facsimile machines, personal computers, terminal devices and the like. In particular, facsimile machines are required to reduce communication time and communication charges.
High-speed modems such as 4 kbit / sec have been developed,
Although the communication speed can be increased, the higher the speed, the weaker the line noise is, and the higher quality line is required.

However, since it communicates with a device having various communication capabilities and a device having various line distances such as a facsimile machine, it is not always possible to communicate at such a maximum speed.
In some cases, communication must be performed at a speed according to the line quality, and it is necessary to shorten the time until the communication speed is established.

[0005]

2. Description of the Related Art FIG. 4 is an explanatory diagram of a conventional technique. Figure 4
As shown in (A), as a procedure for performing facsimile communication from the transmitting facsimile machine 1 to the receiving facsimile machine 2, in the G3 facsimile machine, according to the recommendation of CCITT T30, dialing is performed from the transmitting side 1 to the receiving side 2 and the calling side 2 is called. Responds with a CED signal which is a tone signal of 2100 Hz.

[0006] The receiving side 2 further has an optional NSF.
(Non-standard function signal) is used to notify the company's mode, etc., and CSI is used to notify the telephone number. Next, the receiving side 2 notifies the transmitting side 1 of the receivable recording paper size and the receivable communication speed by a DIS (notification of own capacity) signal.

The transmission side 1 compares the capability (communication speed) of the transmission side with the communication speed of the reception side, determines a common maximum communication speed held by each other as the communication start speed, and this is sent to the reception side 2 by DCS. (Notification of communication condition) Notified as a signal.

Then, at this speed, the training signal TC
Send F to receiver 2 and train receiver 2's modem to get the result. Training result is CFR
If the (training is good) signal, the transmission side 1 transmits the image data at the communication speed, and when the transmission of the image data is completed,
An EOP (end of page) signal is transmitted to the receiving side 2 to end the communication.

The meaning of transmitting such a training signal TCF is to train the modem on the receiving side 2 and to establish the communication speed based on the training result, because the receiving characteristic changes depending on the line quality and the like. ..

Therefore, as shown in FIG. 4 (B), when communication is started at the maximum speed of 14.4 kb, the receiving side 2
When a training failure (FTT) signal arrives from the communication side, the communication speed is reduced (here, 12.0 kbs), training is performed again, the result is obtained, and when a training failure (FTT) signal arrives from the receiving side 2, communication is performed. When the speed is reduced (here, 9.6 kbs), training is performed again, the result is obtained, and when a CFR (training good) signal is obtained, this speed is set as the maximum speed for data communication. Establishment procedures are required.

[0011]

However, the prior art has the following problems. Before the data communication, it is trained whether it is possible with this communication speed according to the determined communication speed, if the result is good, it shifts to the data communication, if it is poor, the communication speed is reduced and the training is performed again. 4 (B), when the line quality is poor, communication cannot be performed well at a high communication speed, and it takes time to establish a communicable communication speed.

In a device capable of high-speed communication such as 14.4 kb, since it starts from the highest speed, it takes time to establish the communication speed, and there is a possibility that the total communication time will be longer than that of the conventional one, resulting in a low communication cost. Invited up,
The advantage of a high-speed machine is lost.

Therefore, an object of the present invention is to provide a communication start rate control method capable of shortening the time until the establishment of the communication rate. It is another object of the present invention to provide a communication start speed control method capable of shortening the time until the communication speed is established with a simple structure.

[0014]

FIG. 1 shows the principle of the present invention. According to claim 1 of the present invention, the communication destination 1 is called from the communication source 1, and the communication speed capability of the communication destination 2 is received.
When a training signal is transmitted from the communication destination 2 and a training signal is received from the communication destination 2, the maximum speed common to the communication speed capability of the communication destination 2 and the communication speed capability of the communication destination 2 is set as the communication start speed.
In the communication system in which the communication speed is reduced by one step, the training signal is transmitted, and the data is communicated at the communication speed when the communication destination 2 receives the good training, the previous communication speed of the communication destination 2 is registered. The communication speed registered with respect to the communication destination 2 is set as the communication start speed.

According to a second aspect of the present invention, the communication source 1 calls the communication destination 2, receives the communication speed capability of the communication destination 2, and determines the communication speed capability of the communication source 1 and the communication speed capability of the communication destination 2. When the training signal is transmitted from the communication destination 2 by using the common maximum speed of the communication start speed as the communication start speed, the communication speed is reduced by one step and the training signal is transmitted from the communication destination 2 In a communication system that communicates data at the communication speed at the time of receiving good training, the previous communication speed of the communication destination 2 is registered, and the registered communication speed is set for the communication destination 2. As the communication speed capability of No. 1, the maximum speed common to the communication speed capability of the communication destination 2 is set as the communication start speed.

A third aspect of the present invention is characterized in that, in the first or second aspect, the communication source 1 registers the communication speed with respect to the communication destination to which a telephone number is registered. According to a fourth aspect of the present invention, in the third aspect, the communication source 1 receives the communication speed capability of the communication destination 2 with respect to the communication destination in which the telephone number is not registered, and It is characterized in that the maximum speed common to the communication speed capability and the communication speed capability of the communication destination 2 is set as the communication start speed.

A fifth aspect of the present invention is characterized in that, in the first, second, third or fourth aspect, the communication source 1 and the communication destination 2 are facsimile machines.

[0018]

According to the first aspect of the present invention, the previous communication speed of the communication destination 2 is registered, and the registered communication speed is set as the communication start speed for the communication destination 2, and the line status is set. Since the communication start speed is determined by recognizing, the time until the establishment of the communication speed can be optimized.

According to a second aspect of the present invention, the previous communication speed of the communication destination 2 is registered, and the registered communication speed is set to the communication destination 2 as the communication speed capability of the communication source 1. Optimizing the time until the establishment of the communication speed in order to determine the communication start speed by recognizing the line status by setting the maximum speed common to the communication speed capability of the communication destination 2 as the communication start speed. In addition to the above, even if the device of the communication destination 2 is changed and the communicable speed is changed, it is possible to cope with the change.

In claim 3 of the present invention, the communication source 1 registers the communication speed with respect to the communication destination in which the telephone number is registered. By recognizing and determining the communication start speed, the time until the establishment of the communication speed can be optimized, and the maximum effect can be obtained by minimizing the memory capacity.

In claim 4 of the present invention, the communication source 1 receives the communication speed capability of the communication destination 2 with respect to the communication destination in which the telephone number is not registered, and the communication speed capability of the communication source 1 is received. Since the maximum speed common to the communication speed capability of the communication destination 2 and the communication destination 2 is set as the communication start speed, it is possible to eliminate the registration of the communication destination that is not registered and is used less frequently, and minimize the memory capacity. ..

In the fifth aspect of the present invention, since the communication destination 2 and the communication source 1 are facsimile machines, the time required for establishing the communication speed of the high speed facsimile machine can be minimized, the communication cost can be reduced, and the communication time can be reduced. Can be shortened.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (a) Description of an Embodiment FIG. 2 is a block diagram of an embodiment of the present invention, showing a structure of a G3 facsimile apparatus.

In the figure, reference numeral 3 is a main control unit, which is composed of a microprocessor (MPU), and which performs facsimile transmission and reception processing, and the like, 4 is a storage unit,
A program required to control the main control unit (processor) 3,
A table 40 for storing data, a telephone number corresponding to one-touch keys and speed dials, and a previous transmission speed, and a capacity storage area 41 for storing the capacity of the device such as paper size and transmission speed are provided. Have

Reference numeral 5 denotes a communication control unit, which controls communication with a partner facsimile machine via a line, is composed of a modem and a network control unit (NCU), and 6 denotes a reading unit, which is a transmission document. For reading the contents of 7
Is a recording unit for recording the received image data on paper, and 8 is an operation unit for inputting a numeric keypad such as a telephone number,
It is composed of various keys such as one-touch keys that can specify a telephone number with one touch, speed dial keys, send keys, etc., and a display section for displaying operation guidance, status display, etc. 9 is a compression / decompression section for transmitting image data. The received image data is restored by compression.

FIG. 3 is a processing flow chart of an embodiment of the present invention. The transmission original is set on the reading unit 6, and one of the one-touch key, the speed dial key and the ten-key pad of the operation unit 8 is operated to input the telephone number of the facsimile apparatus 2 of the other party.

When the one-touch key or the speed dial key is operated, the processor 3 refers to the table 40 of the storage unit 4 to obtain the corresponding telephone number, and in the operation of the ten-key, the input telephone number is used. When the receiving facsimile machine 2 is called from the communication control section 5 via the line, the receiving side 2
Responds with a CED signal which is a tone signal of 2100 Hz.

Receiving side 2 also has an optional NSF
(Non-standard function signal) is used to notify the company's mode, etc., and CSI is used to notify the telephone number. Next, the receiving side 2 notifies the transmitting facsimile apparatus 1 of the receivable recording paper size and the receivable communication speed by a DIS (self-capacity notification) signal.

As a result, the processor 3 knows the capability of the receiving side 2 via the communication control unit 5. The processor 3 determines whether the call was made by the one-touch key or the speed-dial key. If the call is not made by the one-touch key or the speed-dial key, the processor 3 does not register the previous transmission rate because the call is made by the ten-key, and is stored. The maximum transmission rate information of the own device is obtained from the capacity area 41 of the section 4, and the process proceeds to snap.

When the processor 3 determines that the call is made by the one-touch key or the speed dial key, it refers to the table 40 of the storage unit 4 to determine whether there is the previous transmission speed information for the operated one-touch key or the speed dial key. judge.

If there is no previous transmission rate information, since it is not registered, the maximum transmission rate information of its own device is obtained from the capacity area 41 of the storage unit 4, and the process proceeds to step. When the processor 3 determines that there is previous transmission speed information for the operated one-touch key or speed dial key, the processor 3 extracts the stored transmission speed information and proceeds to the step.

The processor 3 compares the extracted transmission rate information with the transmission rate information of the receiving side 2 and determines a common maximum transmission rate that they have as a communication start rate. After that, the processor 3 starts communication, and DC including the above data is transmitted to the reception facsimile apparatus 2 via the communication control unit 14.
Notification is made as an S (communication condition notification) signal.

Thereafter, the communication control unit 5 transmits the training signal TCF to the reception facsimile machine 2 at this speed to train the modem of the reception facsimile machine 2 and obtain the result.

In the processor 3, the training result is
Processor 3 if CFR (good training) signal
Transmits the image data at the communication speed via the communication control unit 5, and when the transmission of the image data ends, transmits an EOP (end of page) signal to the receiving side 2 to end the communication.

When a training failure (FTT) signal arrives from the receiving facsimile apparatus 2, the processor 3
Lowers the transmission rate, re-trains, obtains the result, and when a training error (FTT) signal arrives from the receiving side 2, further lowers the transmission rate, re-trains, obtains the result, and obtains the CFR. When a (training good) signal is obtained, the image data is communicated with this speed as the optimum speed, and when the transmission of the image data is completed, the EO is sent to the receiving side 2.
The P (page end) signal is transmitted to end the communication.

Upon completion of the communication, the processor 3 determines the transmission speed at which the image data is transmitted, in the table 40 of the storage unit 4.
The previous transmission speed is stored in the previous transmission speed column of the one-touch key or the speed dial key that made the call, and the processing ends.

In this way, the line status at the time of the previous transmission is stored as the transmission speed, and this is set as the communication start speed at the next transmission. Therefore, the optimum communication according to the line status with the communication partner is performed. Since communication can be started from the start speed, the establishment of communication speed can be minimized.

Especially, in the case of a high speed machine, the maximum speed is 14.4 kbs.
And 12.0 kbs, 9.6 kbs, 7.2 kbs, 4.8
As many communication speeds as six levels, such as kbs and 2.4 kbs, are possible, and if the partner device is 14.4 kb, it is necessary to perform optimum communication speed determination processing up to 6 times depending on the line conditions. This is done only once or twice, and the effect of reducing the communication time and the communication cost is great, and the merit of the high-speed machine is not reduced.

Further, by applying the one-touch keys and the speed dial keys to the registration targets and applying them only to the frequently used ones, they can be efficiently executed and the memory capacity can be minimized.

Furthermore, since the previous transmission rate is updated for each transmission, the next communication start rate can always be determined from the previous history, so that it is possible to cope with changes in the line condition. Moreover,
Since the communication start speed is determined by comparing the previous transmission speed and the maximum transmission speed on the receiving side, the receiving side facsimile apparatus can be changed and the communication speed can be changed.

(B) Description of Other Embodiments In addition to the above embodiments, the present invention can be modified as follows. Although the one-touch keys and speed dial keys that are frequently used are targeted, if there is a memory capacity, it is possible to store the previous transmission speed of all communication partners, and the necessary communication partner can be specified by the operator's instruction. The previous transmission rate of may be stored.

Even if the previous transmission rate is registered, it is compared with the transmission rate on the receiving side, but the previous transmission rate may be used as it is as the communication start rate. Although the communication device is described as a facsimile device, it may be applied to other communication devices such as a personal computer.

Although the transmission rate is updated every time, it may be stored only at the first transmission, or may be averaged and stored. Although the present invention has been described with reference to the embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0044]

As described above, according to the present invention,
It has the following effects. The previous communication speed of the communication destination 2 is registered, the registered communication speed is set as the communication start speed for the communication destination 2, the line state is recognized, and the communication start speed is determined. Therefore, the time until the establishment of the communication speed can be optimized, and the communication time can be shortened.

Since the time until the establishment of the communication speed can be optimized, the communication cost can be reduced and it is particularly effective when applied to a high speed machine.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a processing flowchart of an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1 sending facsimile device 2 receiving facsimile device 3 processor (main control unit) 4 storage unit 5 communication control unit 6 reading unit 7 recording unit 8 operation unit 9 compression / decompression unit 40 table

Claims (5)

[Claims] 1. A communication source (1) calls a communication destination (2), receives the communication speed capability of the communication destination (2), and the communication speed capability of the communication source (1) and the communication destination (2). A training signal is transmitted with the maximum speed common to the communication speed capability as the communication start speed, and when training failure is received from the communication destination (2), the communication speed is reduced by one step and the training signal is transmitted. , In a communication system in which data is communicated at the communication speed at which the communication destination (2) receives good training, the previous communication speed of the communication destination (2) is registered, and the communication destination (2) is registered. On the other hand, the communication start speed control method is characterized in that the registered communication speed is set as the communication start speed. 2. The communication source (1) calls a communication destination (2), receives the communication speed capability of the communication destination (2), and the communication speed capability of the communication source (1) and the communication destination (2). A training signal is transmitted with the maximum speed common to the communication speed capability as the communication start speed, and when training failure is received from the communication destination (2), the communication speed is reduced by one step and the training signal is transmitted. , In a communication system in which data is communicated at the communication speed at which the communication destination (2) receives good training, the previous communication speed of the communication destination (2) is registered, and the communication destination (2) is registered. On the other hand, the registered communication speed is set as the communication speed capability of the communication source (1), and the maximum communication speed common to the communication speed capability of the communication destination (2) is set as the communication start speed. Speed control method. 3. The communication start speed control method according to claim 1, wherein the communication source (1) registers the communication speed with respect to the communication destination in which a telephone number is registered. 4. The communication source (1) receives the communication speed capability of the communication destination (2) with respect to the communication destination to which the telephone number is not registered, and the communication speed of the communication source (1). 4. The communication start speed control method according to claim 3, wherein the communication start speed is a maximum speed common to the communication speed and the communication speed capacity of the communication destination (2). 5. The communication source (1) and the communication destination (2)
And a facsimile machine.
Alternatively, 2 or 3 or 4 communication start speed control method.