JP2001292291A - Image communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide image communication equipment, with which ECM communication is validated when V. 17, V. 29 and V. 27ter communication is selected from the beginning, and communication time is not prolonged at the time of fallback from V. 34 communication to V.17, V, 29 and V. 27ter communication on the other hand. SOLUTION: Concerning the image communication equipment capable of ITU-T recommendation V. 34 communication, this equipment has a fallback means from ITU-T recommendation V. 34 communication to ITU-T recommendation V. 17, V. 29 and V. 27ter communication and an ECM communication inhibiting means for inhibiting the ECM communication at the time of fallback from ITU-T recommendation V. 34 communication to ITU-T recommendation V. 17, V. 29 and V. 27ter communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image communication apparatus such as a facsimile apparatus, and more particularly, to an ITU-T Recommendation V.10. Three
The present invention relates to an image communication device capable of four communication.

[0002]

2. Description of the Related Art Conventional ITU-T Recommendation V. In a facsimile apparatus capable of performing communication, if the line condition is poor, the bit rate can be reduced. It is not possible to fall back from the 34 communication method to another communication method.

[0003]

However, in the above conventional example, even if the communication line condition is poor, the ITU-T
Recommendation V. 34 communication is selected. It is not possible to fall back from the 34 communication method, and a communication error may occur.

On the other hand, if the communication condition is poor, the ITU
-T Recommendation V. 34 communication, ITU-T Recommendation V.34. It has been proposed to fall back to 17 communication. In the 17th communication, the ECM communication is executed,
Therefore, there is a problem that retransmission frequently occurs and communication time is significantly increased.

[0005] This problem also occurs in image communication devices other than facsimile devices.

SUMMARY OF THE INVENTION 17, V.I. 29,
V. When the 27 ter communication is selected, the ECM communication is enabled. 34 communication. 17, V.I. 2
9, V.I. It is an object of the present invention to provide an image communication device in which communication time does not increase when fallback is performed to 27ter communication.

[0007]

SUMMARY OF THE INVENTION The present invention is based on ITU-T Recommendation V.3. In an image communication device capable of communication, ITU
-T Recommendation V. 34 communication, ITU-T Recommendation V.34. 17,
V. 29, V.I. Fallback means for fallback to 27 ter communication, and ITU-T Recommendation V.27. 34 communication, ITU-T Recommendation V.34. 17, V.I. 29, V.I. 27te
An image communication apparatus having ECM communication prohibition means for prohibiting ECM communication when fallback to r communication.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a facsimile apparatus FS1 according to one embodiment of the present invention.

In the facsimile apparatus FS1, the NCU
The (network control device) 2 connects the terminal of the line to use the telephone network for data communication or the like, controls connection of the telephone switching network, switches to a data communication path,
This is to maintain the loop. The NCU 2 connects the telephone line 2a to the telephone (CML off) or connects the telephone line 2a to the facsimile machine (CML on) under the control of the bus 24. In a normal state, the telephone line 2a is connected to the telephone 4 side.

The hybrid circuit 6 separates the transmission system signal and the reception system signal, sends the transmission signal from the addition circuit 12 to the telephone line 2a via the NCU 2, and transmits the signal from the other party via the NCU 2 The signal is received and sent to the modem 8 via the signal line 6a.

The modulator / demodulator 8 is based on ITU-T Recommendation V. 8,
V. 21, V.I. 27ter, V.I. 29, V.I. 17, V.I.
This is a modulator / demodulator that performs modulation and demodulation based on the reference 34, and each transmission mode is designated by control of the bus 24. The modulator / demodulator 8 receives a transmission signal from the bus 24, outputs modulated data to the signal line 8a, receives a received signal output to the signal line 6a, and outputs demodulated data to the bus 24.

The circuit 10 for transmitting the ANSam signal determines whether or not to transmit the ANSam signal based on the signal from the bus 24.

The adder circuit 12 receives the information of the signal line 8a and the information of the signal line 10a and adds the result of the addition to the signal line 12a.
Output to

The read circuit 14 transmits read data to the bus 2
4 is output.

The recording circuit 16 sequentially records the information output to the bus 24 line by line.

The memory circuit 18 is used for storing work information, raw information of read data or encoded information, and also stores received information or decoded information. .

A CPU (central processing unit) 20 is for controlling the entire facsimile apparatus or controlling the facsimile transmission, and its control program is stored in a ROM (read only memory) 22.

The ROM 22 stores a control program,
In this control program, the own device is a receiver, and the other party's transmitter transmits If there is no communication function, 17, V.I. 29,
V. 27ter communication is performed (here, ECM communication is valid, that is, if the partner transmitter has an ECM communication function,
ECM communication is performed). 34 communication function, In this case, the communication is performed at, for example, 12 Kb / s or less, and if an image signal of the primary channel is received and there is an error, the V.34 communication is performed. 34
V. protocol. 34 communication to V.34. 17 fallback to communication, and then The control program transmits a DIS signal 21 and declares no ECM reception function.

FIG. 2 is a diagram showing a protocol in the above embodiment. The protocol corresponding to the above description is shown in FIG.
This is shown in (1).

In the control program, the own device is a transmitter, and the other party's receiver receives 34 Without communication function,
V. 17, V.I. 29, V.I. 27ter communication is performed (here, ECM communication is valid, that is, if the other receiver has an ECM communication function, ECM communication is performed). 34 communication function, 34 communication is performed, where a V.34 communication is performed from the receiver. V.34 protocol. 34 communication to V.34. When the fallback to the communication No. 17 is designated, the V.17 transmitted from the receiver is subsequently transmitted.
21 DIS signal, and 21 DCS
A control program that transmits a signal but does not specify ECM communication. This protocol is shown in FIG.

FIGS. 3, 4, 5, 6, 7, and 8 show:
It is a flowchart which shows the control operation of the said Example.

In S2, the CML of the NCU 2 is turned off via the bus 24, and in S4, the ANS is
The ANSam signal of the am sending circuit 10 is not transmitted, and S6,
In S8, it is determined whether transmission or reception has been selected,
If transmission is selected, the process proceeds to step S12. If reception is selected, the process proceeds to step S80. If neither is selected, the process proceeds to step S10 to execute other processing.

In S12, the NCU 2
In step S14, a call is made to the designated destination via the bus 24, and in step S16, the T1 timer
Seconds are set, and in S18, a CNG signal is transmitted and S
At 20, the T4 timer is set to 3 seconds.

In S22, the information of the bus 24 is input, and A
It is determined whether or not the NSam signal has been detected.
If a signal is detected, the process proceeds to step S24, where a CM signal is transmitted via the bus 24, and if no ANSam signal is detected, the process proceeds to step S26.

In S26, V.V. It is determined whether or not the DIS signal has been received. If the DIS signal of No. 21 is received, the process proceeds to step S28, and if not, the process proceeds to step S34.

In S28, the other party's V.V. It is determined whether there is a receiving function of V.8. If there is a receiving function of V.8, the process proceeds to step S30, and the other party receives V.8. If there is no receiving function of No. 8, the process proceeds to step S66, and in S30, T1
It is determined whether or not the timer has timed out. If the T1 timer has timed out, the process proceeds to step S2,
If one timer is not over, step S3
Proceed to 2 to transmit a CI signal.

In S34, it is determined whether or not the T4 timer has timed out. If the T4 timer has timed out, the process proceeds to step S36, and if the T4 timer has not timed out, the process proceeds to step S22.

In S36, it is determined whether or not the T1 timer has timed out. If the T1 timer has timed out, the process proceeds to step S2. If the T1 timer has not timed out, the process proceeds to step S18.

In S38, a JM signal is received, in S40, a CJ signal is transmitted, in S42, a line probing signal is transmitted, in S44, a training signal is transmitted, in S46, parameter exchange is performed, and in S48, Then, the primary channel signal is transmitted, and in S50,
V. Execute 34 protocols.

At S52, V.V. 34 to V.I. It is determined whether a signal designating fallback to 17 has been received, and when a signal designating fallback is received, S5
8 and proceed to V.8. After receiving the DIS signal of No. 21 and not receiving a signal designating fallback, the process proceeds to S54.

In S54, it is determined whether or not there is information to be transmitted.
If there is no information to be transmitted, the process proceeds to step S56, and Execute 34 protocols.

At S60, V.V. 21 DCS signals are transmitted, where the ECM signal is not specified.

At S62, V.V. 17, V.I. 29, V.I. 2
7ter, a normal G3 communication is performed instead of the ECM communication, and a post-procedure is executed in S64.

In step S66, it is determined whether or not the partner machine has an ECM function. If the partner machine has an ECM function, the flow advances to step S68 to proceed to step S68. ECM by DCS signal of 21
Communication is specified, and then the V.V. 17, V.I.
29, V.I. Then, transmission (execution of ECM communication) is performed at step S27, and a post-procedure is executed at step S72. 21 without specifying the ECM communication by the DCS signal of step S21. 17, V.I. 29,
V. Transmission at 27 ter is performed (execution of normal G3 communication instead of ECM communication), and subsequently, at S78, a post-procedure is executed.

In S80, the NCU 2
In S82, the T1 timer is set to 60 seconds, in S84, the flag FBFLG designating fallback is cleared, in S86, the ANSam signal timer is set to 4 seconds, and in S88, ANSam is set.
A signal is transmitted. In S90, it is determined whether or not the ANSam signal timer has timed out. If the ANSam signal timer has timed out, the process proceeds to step S132. If the ANSam signal timer has not timed out, the process proceeds to step S92.

In S92, it is determined whether or not a CM signal has been received. If a CM signal has been received, the flow advances to step S94 to receive a JM signal. Subsequently, the flow advances to step S96 to receive a CJ signal. If no CM signal has been received, the process proceeds to step S88.

At S98, a line probing signal is received, at S100, a long training signal is received, and at S102, parameter exchange is executed.

In S104, the primary channel signal is received. Execute 34 protocols.

In S108, it is determined whether or not the received information has an error.
The process proceeds to step S110, and if there is no error in the received information, the process proceeds to step S114.

In S110, the immediately preceding transmission speed is 12 Kb.
/ S is determined to be less than or equal to
If it is 2 Kb / s or less, the process proceeds to step S112, where F
BFLG is set to 1 and the immediately preceding transmission speed is 12 Kb /
If not less than s, the process proceeds to step S104.

In S114, it is determined whether or not it is a break of one physical page.
Proceeding to step S116, if it is not a division of one physical page, proceeding to step S104.

In S116, it is determined whether or not FBFLG is 1; if FBFLG is 1, step S1 is executed.
Proceeding to step S12, if FBFLG is 0, step S11
Proceed to 8.

In S118, it is determined whether or not there is a next page. If there is a next page, the process proceeds to step S104,
If there is no next page, the process proceeds to step S120, 34
Execute the protocol.

In S122, it is determined whether or not there is a next page. If there is a next page, the process proceeds to step S124,
V. V.34 protocol. 34 to V.I. 17 is instructed, and if there is no next page, step S2
Proceed to.

At S126, V.V. Then, a DIS signal of No. 21 is transmitted, and here, the absence of the ECM receiving function is notified.

At S128, V.V. 17, V.I. 29, V.I.
27ter, the normal G3 communication is performed instead of the ECM communication, and a post-procedure is executed in S130. 21 is transmitted, where V.21 is transmitted. 8 Notify that there is a receiving function and that there is also an ECM receiving function.

In S134, the T4 timer is set to 3 seconds, and in S136, S138 and S140, before the T4 timer times out, the CI signal or the DCS
It is determined whether a signal has been received. If a CI signal has been received, the process proceeds to step S88, and if a DCS signal has been received,
Proceeding to step S144, if the T4 timer times out, proceeding to step S142.

In S142, it is determined whether or not the T1 timer has timed out. If the T1 timer has timed out, the flow proceeds to step S2, and if not, the flow proceeds to step S132.

In S144, it is determined whether or not ECM communication has been designated. If ECM communication has been designated, the flow advances to step S146 to proceed to step S146. 17, V.I. 29, V.I. 27ter
(Execution of ECM communication) at step S148. Then, the process proceeds to step S148 to execute a post-procedure. If not specified, the process proceeds to step S150. 17, V.I. 29, V.I. 27ter reception (EC
Execution of normal G3 communication instead of M communication)
Proceeding to S152, the post-procedure is executed.

According to the above embodiment, V.V. 17,
V. 29, V.I. If 27 ter communication is selected, E
CM communication is enabled, while V. 34 communication. 1
7, V.I. 29, V.I. When the communication falls back to the 27 ter communication, it is determined that the line state is bad, the ECM communication can be prohibited, and the communication time does not increase.

According to the above embodiment, V.V. 34 to V.I. 1
Normal G3, which securely prohibited ECM, whether it was a transmitter or a receiver at the time of fallback to 7.
Communication becomes possible.

The above embodiment may be applied to another image communication device such as a personal computer having an image communication function.

[0053]

According to the present invention, V.V. 17,
V. 29, V.I. If 27 ter communication is selected, E
CM communication is enabled, while V. 34 communication. 1
7, V.I. 29, V.I. When fallback is made to 27ter communication, it is determined that the line state is bad, ECM communication can be prohibited, and the communication time does not increase.

[Brief description of the drawings]

FIG. 1 shows a facsimile apparatus FS according to an embodiment of the present invention.
FIG.

FIG. 2 is a diagram showing a protocol in the embodiment.

FIG. 3 is a flowchart showing a control operation of the embodiment.

FIG. 4 is a flowchart showing a control operation of the embodiment.

FIG. 5 is a flowchart showing a control operation of the embodiment.

FIG. 6 is a flowchart showing a control operation of the embodiment.

FIG. 7 is a flowchart showing a control operation of the embodiment.

FIG. 8 is a flowchart showing a control operation of the embodiment.

[Explanation of symbols]

 FS1: facsimile machine, 16: recording circuit, 18: memory circuit, 20: CPU, 22: ROM.

Claims (6)

[Claims] 1. An ITU-T Recommendation V. In an image communication apparatus capable of performing communication, ITU-T Recommendation V.34. 34 communication, ITU-T Recommendation V.34.
17, V.I. 29, V.I. Fallback means for fallback to 27ter communication; ITU-T Recommendation V.27. 34 communication, ITU-T Recommendation V.34. 17, V.I. 29, V.I. 27
and ECM communication prohibition means for prohibiting ECM communication when fallback to ter communication occurs. 2. The communication device according to claim 1, wherein the other party transmits the ITU-T Recommendation V.3. No communication function, and ITU-T Recommendation V.34 17, V.I. 29,
V. When 27 ter communication is selected, the ITU-T
Recommendation V. 17, V.I. 29, V.I. An image communication device, wherein ECM communication is enabled in 27 ter communication. 3. The method according to claim 1, wherein the ITU-T Recommendation V. In the ITU-T Recommendation V.34, as a response signal to the PPS-Q signal in communication. Three
From ITU-T Recommendation V.4. 17, V.I. 29, V.I. 27
ter is transmitted, and a signal indicating fallback is transmitted. 21. An image communication apparatus, wherein the apparatus executes 21 protocols. 4. The communication system according to claim 1, wherein the receiver is an ITU-T Recommendation V.3. 34, ITU-T Recommendation V.34 17, V.I. 29, V.I. 27te
r followed by a signal indicating fallback to
V. to send 21. An image communication apparatus for notifying that there is no ECM communication function in the initial identification signal of 21. 5. The method according to any one of claims 1 to 3, wherein the own device is a transmitter. 34, ITU-T Recommendation V.34 17, V.I. 29, V.I. 27te
r followed by a signal indicating fallback to
V. 21. An image communication apparatus, comprising: receiving an initial identification signal of No. 21 and not specifying ECM communication when transmitting a reception command signal. 6. The image communication device according to claim 1, wherein the image communication device is a facsimile device.