JP2000261637A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely attain communication when a communication error is generated in communication, and communication is ended, and re-calling is operated by setting a communication condition at the time of re-calling according to the contents of the communication error, when the communication error is generated. SOLUTION: At calling of a designated destination and realizing the connection of a line with the equipment of a called party at the destination, facsimile transmission processing for transmitting image data stored in a RAM 4 to the called party by V.8 and V.34 protocols, and whether or not communication errors are generated is monitored. When communication errors are generated before the completion of transmission, the line is disconnected, and a fixed time is required for re-calling. then, re-calling time transmission condition setting processing based on the contents of the generated communication error is operated. At re-calling of the designated destination and realizing the re-connection of a line with the equipment of the called party at the destination, facsimile transmission for re-transmitting the image data stored in the RAM 4 to the called party under the set transmission condition is made, and whether or not a communication error is generated is monitored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly, to ITU-T Recommendation V.10. 8, V.I. The present invention relates to a facsimile apparatus capable of terminating communication and re-transmitting to the same destination when a communication error occurs during communication with a partner apparatus while communication is possible.

[0002]

2. Description of the Related Art ITU-T Recommendation V. In a facsimile apparatus capable of communication, a conventional V.34 communication is used. 17, V.I. 29, V.I.
High-speed communication is possible compared to 27ter communication,
Since a wide band is required, it is easily affected by the condition of the line, and when the line condition deteriorates in time series, there is a high possibility that a communication error occurs during image transmission.

[0003]

In the conventional control procedure,
If a communication error occurs during communication, retransmission processing is performed. If the retransmission is performed under the same conditions as the previous communication in the 34th communication, there is a high possibility that the communication will be performed under the same conditions as the previous communication, and therefore, there is a high possibility that an error will occur again. More specifically, if a communication error occurs after retransmission is repeated due to poor line conditions in the first communication, there is a high possibility that communication by retransmission will repeat retransmission. 34, the advantage of high-speed communication is lost.

[0004] In addition, when a line with poor line conditions is When the communication is performed, the line status cannot be accurately grasped at the stage of detecting the line status, which may cause a communication error. In this case, even if retransmission is performed, an accurate line state cannot be obtained, so that there is a high possibility that a communication error will occur again. Specifically, if a poor quality line is erroneously detected as a good line, an unnecessarily high symbol rate and data rate are selected, which causes repeated retransmissions and communication errors. is there.

In communication with a specific destination facsimile, both facsimile devices are set to V.COM depending on line conditions or compatibility with the destination facsimile. 8, V.I.
Even if 34 communication is possible, an error may occur during communication. In this case, There is a problem that even if retransmission is repeated in the 34 communication, a communication error surely occurs.

[0006] The present invention has been made in view of the above circumstances, and has been developed in accordance with ITU-T Recommendation V.3. 8, V.I. It is an object of the present invention to provide a facsimile apparatus capable of reliably performing communication when a communication error occurs during communication in accordance with the 34 transmission control procedure and communication is terminated and retransmission is performed.

[0007]

To achieve the above object, a facsimile apparatus according to the first aspect of the present invention comprises an ITU-T
Recommendation V. 8, V.I. While communication is possible, if a communication error occurs during communication with the destination device, the facsimile device that terminates the communication and re-transmits to the same destination to redo the communication will perform the communication with the destination device. When a communication error occurs, re-communication condition setting means for setting communication conditions at the time of re-transmission according to the content of the communication error;
Re-communication means for re-transmitting to the destination device and re-communicating under the communication conditions set by the re-communication condition setting means.

According to a second aspect of the present invention, in the facsimile apparatus according to the first aspect, the re-communication condition setting means may determine that a communication error occurred when communicating with the destination apparatus is V.100. 8 during communication. 34 communication phase 1 or V.34. 34, the communication condition at the time of retransmission is set to V.34. 8, V.I. 34 communication is not performed. It is characterized in that it is set to a condition that re-communication is performed under existing transmission conditions of 17 or less.

According to a third aspect of the present invention, in the facsimile apparatus according to the first aspect, the re-communication condition setting means sets a communication error generated when the communication is performed with the destination apparatus to V. In the case of occurrence in phase 3 of 34 communication, the communication condition at the time of re-transmission is set to a condition in which the number of points during training is set to a value different from the value at the time of previous communication.

In a facsimile apparatus according to a fourth aspect, in the facsimile apparatus according to the first aspect, the re-communication condition setting means determines that a communication error occurring when communicating with the destination apparatus is V.100. 34 occurs in phase 6 of the communication, the communication condition at the time of the retransmission is changed to a data rate equal to or higher than the data rate selected in the previous communication, and
It is characterized in that conditions are set such that connection is made from the data rate below the stage.

In a facsimile apparatus according to a fifth aspect, in the facsimile apparatus according to the first aspect, the re-communication condition setting means determines that a communication error occurring when communicating with the destination apparatus is V.100. In the case of occurrence in the phase 6 of the 34th communication, the communication condition at the time of the retransmission is set such that the symbol rate equal to or higher than the symbol rate selected in the previous communication is masked and the connection is made from the symbol rate one step lower. It is characterized by the condition.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described in detail.

First, FIG. 1 shows a block configuration of a facsimile apparatus 1 according to an embodiment of the present invention.

In FIG. 1, a facsimile apparatus 1 includes a system control unit 2, a ROM 3, a RAM 4, a scanner 5, a plotter 6, an encoding / decoding unit 7, an operation display unit 8, a communication control unit 9, a modem 10, a network control unit. 11 and a system bus 12.

The system control unit 2 controls each unit of the apparatus according to a control program written in the ROM 3 while using the RAM 4 as a work area.

As described above, the ROM 3 is a read-only memory that stores a control program for the system control unit 2 to control each unit of the apparatus.

The RAM 4 is a random access memory used as a work area of the system control unit 2 as described above. The RAM 4 is backed up by a backup circuit (not shown), and the stored contents are retained even when the power of the apparatus is turned off.

The scanner 5 has 3.85 lines / mm, 7.7
This is for obtaining image information by reading a document image at a predetermined reading line density such as book / mm and 15.4 book / mm. The plotter 6 is for recording and outputting the received image information according to its line density, and for recording and outputting (copying operation) the image information read by the scanner 5 according to its line density.

The encoding / decoding unit 7 converts the transmission image data into
While encoding and compressing with a predetermined coding method such as an MH coding method, an MR coding method, and an MMR coding method conforming to G3 facsimile, the received image data is subjected to an MH coding method.
The decoding is performed by a predetermined decoding method corresponding to the MR coding method, the MMR coding method, or the like.

The operation display unit 8 is provided with a numeric keypad for designating a destination telephone number, a transmission start key, a one-touch dial key, and various other keys. It displays the operating state of the device to be notified and various messages.

The communication control unit 9 includes a modem 10 and a network control unit 1.
1 for facsimile communication. The modem 10 complies with ITU-T Recommendations V8, A modem conforming to No. 34 modulates data to be transmitted to the line via the network control unit 11 and demodulates a signal received from the line via the network control unit 11. The modem 10 also transmits a DTMF signal corresponding to the designated destination number. The network control unit 11 is connected to the line, and closes and releases the DC loop of the line, detects the reversal of the line polarity, detects the line release, detects the dial tone, and outputs a tone signal such as a busy tone (busy). It controls connection with a line, such as detection and detection of a call signal, and generates dial pulses. The system bus 12 is a signal line through which the above components exchange data.

FIG. V.8 performed following the V.8 procedure 1 shows a basic sequence of facsimile communication conforming to F.34.

Referring to FIG. 1, in phase 1, the transmitting side and the receiving side communicate with each other by V.S. 34, and in phase 2, the probing signal L1 /
From the measurement result of L2 by the receiving side, the receiving side determines the highest symbol rate common to the combination of the symbol rates usable by the transmitting side device notified by the transmitting side and the combination of the symbol rates usable by its own device. As an upper limit, the symbol rate is determined, the transmission side is notified by the INFOh signal, and the transmission side is set to the determined symbol rate. In phase 3, training of the equalizer and the echo canceller is performed. In phase 4, final training is performed and the bit rate is determined. In phase 5, capability setting for facsimile communication is performed. In phase 6, a facsimile message is sent.

Next, a transmission processing procedure in the facsimile machine 1 will be described with reference to FIGS.

First, in FIG. 3, the system control unit 2
It is monitored whether a document is set on the scanner 5 (determination 1).
(No loop of No. 01), when a document is set on the scanner 5 (Yes of judgment 101), it is monitored whether or not a transmission destination is designated via the operation display unit 8 (No loop of judgment 102). If there is designation (Ye of judgment 102)
s) It is monitored whether a start key (not shown) of the operation display unit 8 for instructing the start of transmission is pressed (No in the determination 103).
(Loop), when the start key is pressed (Yes in decision 103), the document set in decision 101 is scanned by the scanner 5
Is temporarily stored in the RAM (process 104).

Then, a call is made to the destination designated in the judgment 102 (process 105), and when a line is connected to the destination device (process 106), the image data stored in the RAM 4 in process 104 With V. 8, V.I. While performing facsimile transmission processing for transmission to the other party according to the H.34 protocol (processing 107), it is monitored whether or not a communication error has occurred during the transmission processing, and whether or not transmission has been completed (No in decision 108). , No loop of judgment 109). Although the description of the flowchart is omitted, when a call is made in step 105 and the destination device is notifying, actually, a communication error indicating that the error content is “communicating” is generated. Then, a retransmission operation is performed under the same transmission conditions as the previous transmission.

If the transmission is completed without occurrence of a communication error (Yes in decision 109), the line is disconnected (process 110), and the transmission process ends. If a communication error occurs before the transmission is completed (Yes in decision 108),
The line is disconnected (process 111), the process proceeds to process 112 in FIG. 4, and a predetermined time is waited for retransmission (process 112). Then, a retransmission call transmission condition setting process is performed based on the content of the communication error that has occurred in decision 108 (process 113), and a call is made again to the destination designated in decision 102 (process 114).
When the line is reconnected to the destination device (step 115), the facsimile transmission process of retransmitting the image data stored in the RAM 4 in step 104 to the destination under the transmission conditions set in step 113. (Process 11
6) It is monitored whether or not a communication error has occurred during the transmission processing, and whether or not the transmission has been completed is monitored (No in decision 117, No loop in decision 119).

If the transmission is completed without occurrence of a communication error (Yes in decision 119), the line is disconnected (step 120), and the transmission process is terminated. If a communication error occurs before the transmission is completed (Yes in decision 118),
The line is disconnected (step 118), and the process returns to step 112.

FIG. 5 shows a specific procedure of the retransmission call transmission condition setting process in the process 113.

In the figure, the system control unit 2 determines that the communication error that occurred at the time of the previous transmission, that is, the communication error that occurred at decision 108 or decision 117 8 or V.8. 34 occurred in phase 1 of V.34. 34 occurred in phase 2 or 34 occurred in phase 3 or V.34. It is determined whether or not this occurred in phase 6 of 34 (judgement 201, judgement 202, judgement 203, judgement 204, judgement 205).

If a communication error occurs, Occurred in 8 steps,
V. 34 occurred in phase 1 or V.34. 34
Occurs in phase 2 of (No in decision 201,
(Yes of decision 202 or Yes of decision 203),
V. 8, V.I. No communication is performed, and the existing V.34 communication is not performed. Transmission conditions are set so as to transmit in a transmission mode of 17 or less (process 207). As a result, when the call is re-transmitted, 8 procedures and V. 3
No communication error occurs in the phases 1 and 2 of 4 and the possibility of normal transmission can be increased.

If a communication error occurs 34 occurs (Phase 34: Change the training conditions of the retransmission conditions of Yes in step 204 (Process 208). Specifically, the training points are set to be trained at 4 points. In practice, the sender
V. When the CM signal is transmitted during the eight communications, the transmission mode in which transmission is possible is notified to the receiving side, and the training information in the CM signal at this time is transmitted as a setting that supports only four points. In addition, since there are two types of training, 4 points and 16 points, the number of points at the previous transmission may be masked, and a different number of points from the previous time may be set to perform retransmission. Thereby, the possibility that the training in phase 3 fails and a communication error occurs decreases, and the possibility that the transmission can be performed normally increases.

If a communication error occurs 34 occurs (Phase 6 of the transmission conditions of Yes retransmission in the determination 205, the data rate / symbol rate is masked (Process 209). Specifically, the upper limit of the data rate in V.34 is 6, the value can be set from 21.6 bps to 33.6 bps, but a value one step lower than the value selected at the previous communication is set as the upper limit of the data rate. If the data rate at the time of transmission is 28.8 bps, the data rate is 28.8 bps or more, that is, 33.6 bps, 31.2 bp.
s and 28.8 bps are masked, and the maximum communicable data rate is set to 26.4 bpss before transmission. In practice, the transmitting side has 8 When the CM signal is transmitted during communication, the transmission mode that can be transmitted is notified to the receiver. At this time, the information of the data rate in the CM signal is reduced by one step from the value selected in the previous communication. Set the value as the upper limit and send. The symbol rate can be set from 2400 to 3429, as shown in FIG. 7, but a value one step lower than the value selected at the time of the previous communication is set as the upper limit of the symbol rate. For example, if the symbol rate at the previous transmission was 3200, 3
More than 200 symbol rates, ie 3429 and 3
After the symbol rate of 200 is masked and the maximum value of the communicable symbol rate is set to 3000, retransmission is performed. In practice, the transmitter is 8 When the CM signal is transmitted during communication, the transmission mode that can be transmitted is notified to the receiver. At this time, the information of the symbol rate in the CM signal is changed by one step from the value selected in the previous communication. Set the value as the upper limit and send. As a result, the possibility of a communication error during transmission of the facsimile message in phase 6 is reduced, and the possibility of normal transmission is increased.

If the communication error is V. 8 procedures, V.I. 34 occurs in phases other than phase 1, 2, 3, or 6 (judgment 2
(No in 05), the transmission mode is set to normal conditions (process 206).

As described above, according to the present embodiment, the transmission conditions at the time of re-communication are optimally set so that the communication error at the time of the previous communication is less likely to occur at the time of re-communication. Reliable transmission can be performed.

[0036]

According to the first aspect of the present invention, it is possible to select an optimal transmission mode in accordance with the state of occurrence of a communication error and perform retransmission, so that communication at the time of retransmission becomes error. The effect that it is possible to reduce the possibility of being obtained is obtained. Further, at the time of retransmission, since a mode in which transmission is performed more reliably than the previous communication is selected and transmitted, retransmission is not repeated due to a communication error, and ECM (Erro
r Correcting Mode) Retransmission due to communication is also reduced, and as a result, an effect that communication time can be saved can be obtained.

According to the second aspect of the present invention, the communication error is determined by V. 8 communications; 34 communication phase 1, or
V. 34, it is considered that an error has occurred at the stage of detecting the line condition due to the line condition or compatibility with the facsimile of the other party. Even if you repeat the call with 34 communications,
In view of the very high possibility of a communication error again, the communication error is 8 communications; 34 communication phase 1 or V.34. 34 occurs in phase 2 of the communication, the transmission condition at the time of re-communication is set to the existing V.34. By setting the transmission mode to 17 or less, Although the communication time is longer than that of the 34 communication, the connection can be reliably established, and the effect of increasing the reliability of the communication at the time of retransmission can be obtained.

According to the third aspect of the invention, the communication error is determined by V. 34 occurs in phase 3 of communication, depending on the line status or compatibility with the other party's facsimile,
Considering that it is considered that an error has occurred at the training stage, the number of training points is fixed to 4 points that are more resistant to noise than the training of 16 points, and the training is set and re-transmitted By doing so, it is possible to reduce the possibility that a training error will result in a communication error, and obtain an effect that the reliability of communication at the time of retransmission can be increased.

According to the fourth aspect of the present invention, when the communication error is V. 34 occurs in phase 6 of the communication, it is considered that a communication error has occurred during the image communication due to a change in the line condition or the like. By performing retransmission with the data rate below the upper limit as the upper limit data rate, it is possible to reduce the possibility of a communication error and obtain an effect of increasing the reliability of communication at the time of retransmission. Further, since the probability of retransmission is reduced, there is an advantage that the communication time is shortened as a result.

According to the fifth aspect of the present invention, the communication error is determined by the V.25. 34 occurs in phase 6 of communication, it is considered that a communication error has occurred during image communication due to a change in line condition or the like. By performing retransmission using the lower symbol rate as the upper limit symbol rate, the possibility of a communication error being reduced and the effect of being able to increase the reliability of communication at the time of retransmission being obtained are obtained. Further, since the probability of retransmission is reduced, there is an advantage that the communication time is shortened as a result.

[Brief description of the drawings]

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

FIG. FIG. 2 is a diagram showing a basic sequence of facsimile communication conforming to No. 34.

FIG. 3 is a flowchart showing a transmission processing procedure in the facsimile apparatus according to the embodiment of the present invention.

4 is a flowchart showing a transmission processing procedure in the facsimile apparatus according to the embodiment of the present invention, together with FIG.

FIG. 5 is a flowchart showing a specific procedure of a retransmission call transmission condition setting process.

FIG. FIG. 34 is a diagram showing a data rate that can be set in 34.

FIG. FIG. 35 is a diagram illustrating a symbol rate that can be set in the S.34.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile apparatus 2 System control part 3 ROM4 RAM 5 Scanner 6 Plotter 7 Encoding / decoding part 8 Operation display part 9 Communication control part 10 Modem 11 Network control part 12 System bus

Claims (5)

[Claims] 1. An ITU-T Recommendation V. 8, V.I. If a communication error occurs during communication with the destination device while the communication is possible, the facsimile device that terminates the communication, re-transmits to the same destination, and redoes the communication. When a communication error occurs, a re-communication condition setting means for setting a communication condition at the time of re-transmission in accordance with the content of the communication error, and a re-communication condition set by the re-communication condition setting means for re-transmitting to the destination device A facsimile apparatus comprising: re-communication means for performing re-communication under set communication conditions. 2. The re-communication condition setting means according to claim 1, wherein said communication error occurred when communicating with a destination device is determined by V. 8 during communication. 34 communication phase 1 or V.34. 34, the communication condition at the time of retransmission is set to V.34. 8, V.I. 34 communication is not performed. The facsimile apparatus according to claim 1, wherein the condition is set so that re-communication is performed under 17 or less existing transmission conditions. 3. The re-communication condition setting means according to claim 1, wherein said communication error occurred when communicating with the destination device is V. 34. The communication condition at the time of re-transmission when the communication condition occurs in phase 3 of 34 communication, wherein the number of points at the time of training is set to a value different from the value at the time of previous communication. The facsimile apparatus according to claim 1. 4. The re-communication condition setting means according to claim 1, wherein said communication error occurred when communicating with a partner device is determined by V.V. In the case of occurrence in phase 6 of 34 communication, the communication conditions at the time of retransmission are set such that a data rate equal to or higher than the data rate selected in the previous communication is masked and connection is made from the data rate one step lower. 2. The facsimile apparatus according to claim 1, wherein the condition is a condition. 5. The re-communication condition setting means according to claim 1, wherein said communication error occurred when communicating with a destination device is determined by V.V. In the case of occurrence in the phase 6 of the 34th communication, the communication condition at the time of the retransmission is set such that the symbol rate equal to or higher than the symbol rate selected in the previous communication is masked and the connection is made from the symbol rate one step lower. 2. The facsimile apparatus according to claim 1, wherein the condition is a condition.