JPH10190886A - Facsimile equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute efficient image communication by registering so as to execute V.8, V.34 communication, according to a calling destination telephone number and registering, so as to execute V.21, V.27ter, V.29 and V.17 communication after the time, when all the frames are continuously in error until the final frame after detecting an error during primary channel reception. SOLUTION: It is judged whether or not registering to a mode-registering circuit 26 is selected, and whether V.8 and V.34 communication is executed or V.21, V.27ter, V.29 and V.17 communication is executed is registered in the registering circuit 26 corresponding to a destination based on information of a signal line 28a after selecting registering. Primary channel information is received, and it is judged whether or not an error frame exists in the information and one is counted in a counter, when the all the frames are erroneous after error frame occurrence and moreover continuous error frames are five frames. When a continuous error counter is more than three, it is changed to another form of communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to ITU-T Recommendation V. 8, V.I. 34 relates to a facsimile apparatus capable of communication.

[0002]

2. Description of the Related Art Conventionally, V.V. 8, V.I. In a facsimile apparatus capable of communication, V.34 corresponds to a call destination telephone number. 8 procedure, or There has been proposed a facsimile apparatus which selects whether to execute the 21 procedure (for example, Japanese Patent Application No. Hei 6-31386; hereinafter, referred to as a first conventional technique).

[0003] In this proposal, a destination receiving a call for the first time is V. 34 communication, V.34. 17, V.I. 29, V.I. 2
A procedure capable of coping with the 7 ter communication is started to determine the capability of the caller on the other side. And, as the other party's ability,
If there is a communication function, the next incoming call from the destination will be V.34. Respond in 8 steps. V. If there is no communication function, the next incoming call from the destination will be V.34. 21
The procedure is executed in order to reduce the communication time.

[0004] In addition, the conventional V.V. 8, V.I. 3
V.4 as a facsimile machine capable of communication. 8 full-duplex communication procedure, or When communication of the full-duplex communication procedure cannot be executed, redialing is performed and 21 half-duplex procedure, 27ter, V.I. 29, V.I. One that executes 17 half-duplex image transmission has been proposed (for example, Japanese Patent Application No.
No. 44188; hereinafter, referred to as a second prior art).

In other words, when full-duplex communication becomes impossible, a line is released once, a call is re-established, a call connection is established, and half-duplex communication is executed.

[0006]

By the way, in the above-mentioned first prior art, the V.P.M. corresponding to the destination of each calling side is irrespective of the state of the line characteristics. 34 communication or
V. 17, V.I. 29, V.I. Since it has been determined whether to select 27 ter communication, communication may be inefficient depending on the state of the line characteristics.

For example, V. In the 34 communication, there is a disadvantage that all high-speed data becomes an error by one momentary interruption due to superframe coding or the like. That is, in a line with many instantaneous interruptions, 34 communications, V.34 The communication time is longer than that of the 17th communication, and the reliability of the communication is low.

In the first conventional example, the transmission baud rate and the transmission bit rate are not determined based on the available bandwidth. When 34 communication is selected, communication may not be possible even at 2400 b / s and communication may not be possible.

That is, V.I. 34 communication baud rates are 2400, 2743, 2800, 3000, 320
0, 3429, and 2 at a transmission rate of 2400 b / s.
400 baud is needed. On the other hand, V. 27ter, 24
The baud rate of 00b / s is 1200, and 27
ter, and the baud rate of 4800 b / s is 1600.

For this reason, when the usable bandwidth is narrow, the V.100 is not used. When 34 communication is selected, there is a disadvantage that communication cannot be performed because communication cannot be performed even at 2400 b / s.

Further, in the second conventional example, when a response signal to the line probing signal cannot be received, it is determined that full-duplex communication cannot be performed. I tried from 17 image transmissions. Therefore, from 14.4 kb / s, 12 kb / s,
Furthermore, 9.6 kb / s, 7.2 kb / s, 4.8 kb
/ S, which is a disadvantage that the time required for the pre-procedure becomes very long.

The present invention relates to 8, V.I. It is an object of the present invention to provide a facsimile apparatus capable of performing an efficient image communication by appropriately selecting the 34 communication.

[0013]

Means for Solving the Problems The first invention of the present application is:
In a facsimile apparatus capable of detecting call destination telephone number information before a call connection, an ITU-T recommendation V.100 is used. 8, V.I. 34 communication means and ITU-T Recommendations V21 and V.34. 27ter, V.I.
29, V.I. 17 communication means and V.17 corresponding to the call destination telephone number. 8, V.I. 34 communication, or 21, V.I. 2
7ter, V.I. 29, V.I. 17 for registering whether or not to execute the communication. In the initial state, the V.17 communication is performed in correspondence with the call destination telephone number. 8, V.I. 34
After registering to execute communication and detecting an error during reception of the primary channel, if all frames up to the last frame are erroneous for a predetermined number of times, after that, the call will be made after that. V. corresponding to the destination telephone number 21, V.I. 27ter, V.I. 29, V.I. 17 is registered so as to execute communication.

Further, the second invention of the present application is directed to a case where after detecting an error during the reception of the primary channel, one frame is correctly received before a predetermined number of times that all the frames are erroneous until the last frame. Resets a counter for counting the predetermined number of times.

In the first and second aspects of the present invention, from a destination having many instantaneous interruptions, it is highly likely that one error affects all subsequent frames. V.34 communication, one error affects only a few subsequent frames.
27ter, V.I. 29, V.I. 17 communication, and it is possible to reliably perform communication even from a destination with many instantaneous interruptions.

Further, according to a third invention of the present application, after an error is detected during reception of the primary channel, before a predetermined number of times that all the frames are erroneous until the last frame, a correct frame after the error frame is detected. Is detected, the counter for counting the predetermined number of times is reset. In the third invention, the V.V. 34, it is possible to realize communication with emphasis on communication.

Further, the fourth invention of the present application is an ITU-T
Recommendation V. 27ter, V.I. 29, V.I. 17, V.I. In a facsimile machine capable of transmitting 34 images, the
U.T. Recommendation V. 8 procedures, V.I. When the available bandwidth is equal to or less than the predetermined bandwidth at the time of receiving the line probing signal, the communication is interrupted, and the incoming call within the predetermined time is followed by the ITU-T Recommendation V.34. 21 procedures, V.I. 2
7ter image transmission is performed. Therefore, in the fourth invention, the usable band is very narrow,
V. 2400 baud. 34 If the communication is not possible, the communication is cut off and the
V. 00 or 1600 baud. By performing the 27ter communication, the communication can be reliably performed.

Further, the fifth invention of the present application is an ITU-T
Recommendation V. 27ter, V.I. 29, V.I. 17, V.I. A facsimile apparatus capable of transmitting 34 pictures, comprising: detecting means for detecting a destination of a calling side before a call connection; and registering means for registering an available band corresponding to the destination of the calling destination.
-T Recommendation V. 8, V.I. 34, the available bandwidth determined by receiving the line probing signal at the time of communication is registered corresponding to the destination of the call destination, and at the time of the incoming call, the destination information of the other party is determined, and Depending on the registered available bandwidth, the above V.V. 8, V.I. 34 communication or ITU-T Recommendation V.34. 21, V.I. It is characterized by determining whether to execute 27 ter communication.

[0019] The sixth invention of the present application is directed to a video communication system according to the present invention, wherein when the usable band exceeds a predetermined band. 8, V.I. 3
4 communication is performed, and when the predetermined band is below, 21, V.I. 27ter communication is performed.

In the fifth and sixth aspects of the present invention, reception from a destination having a narrow usable band is performed according to the V.264 standard. 21, communication. 27t
er communication can be executed reliably, and reception from a destination having a wide usable bandwidth is performed according to V.11. 8, V.I. 34 communications.

The seventh invention of the present application is based on ITU-T
Recommendation V. 27ter, V.I. 29, V.I. 17, V.I. In a facsimile machine capable of transmitting 34 images, the
U.T. Recommendation V. 8 procedures, V.I. When the available band is equal to or less than the predetermined band at the time of receiving the line probing signal, Move to step 21
Then, V. 27ter image transmission is performed.

Therefore, according to the seventh invention, when the usable band is narrow in one communication, V.V. 8, V.I. 34 communication. 21, V.I. It is possible to fall back to the 27 ter communication, and secure the communication.

The eighth invention of the present application is based on ITU-T
Recommendation V. 8, V.I. 34, in a facsimile apparatus capable of communication. 8, V.I. After starting the communication and transmitting the line probing signal, if the response signal from the partner device cannot be received, the line is disconnected, and after a predetermined time elapses, an automatic call is made to the same destination and retransmission is performed. At the time of this retransmission, ITU-T Recommendation V. 21, V.I. 27ter communication is performed.

Therefore, in the eighth invention, V.V. 8
Since the full-duplex procedure is established, line probing is not established due to the inability of full-duplex communication, but if line probing is not established due to the narrow available line, In that redial, 27ter (1600 baud at 4800 b / s,
Since communication is started at 1200 baud at 2400 b / s), fallback does not occur even on a line with a narrow available band, so that communication can be executed reliably and in a short procedure time.

Further, the ninth invention of the present application provides an ITU-T recommendation V.40 for a call destination. 8, V.I. 34 communication, or according to ITU-T Recommendation V.34. 21, V.I. V.27ter having means for registering whether to execute 27ter communication. 8, V.I. In a facsimile apparatus capable of communication, the initial state is V.34 corresponding to the call destination. 8, V.I. 34, it is registered that the communication is to be executed, and after a call is actually selected and a line probing signal is transmitted, if a response signal from the other party cannot be received a plurality of times in succession, the same The call to the destination is sent to 21, V.I. It is characterized by 27 ter communication.

Therefore, according to the ninth invention, communication to a destination having a narrow line band corresponding to the call destination is immediately performed by the V.30. 27ter communication becomes possible, the time required for the pre-procedure can be shortened, and communication can be executed reliably, and communication to a destination with a wide used line bandwidth is performed at a high speed of 33.6 kb / sec.
V.s. 34 communication becomes possible.

[0027] The tenth invention of the present application relates to the above-mentioned V.11.
21, V.I. In the communication to the call destination registered to perform the 27 ter communication, if the communication of 4800 b / s is established continuously for a predetermined number of times, the ITU is sent to the destination thereafter.
-T Recommendation V. 21, V.I. 27ter, V.I. 29, V.I. 1
7 is registered so as to perform communication, and communication is performed based on the registration information.

Therefore, according to the tenth aspect, even when communication is performed at 4800 b / s, communication can be attempted at a higher transmission rate even when communication is performed to a destination determined to have a narrow line bandwidth. And practicality can be improved.

[0029] The eleventh invention of the present application relates to the aforementioned V.V.
21, V.I. 27ter, V.I. 29, V.I. In the case where communication of 14.4 kb / s has been established for a predetermined number of times in the communication to the call destination registered to perform the communication, the V.17 communication is performed to the destination thereafter. 8, V.I. It is characterized by performing registration based on this registration information.

Therefore, according to the eleventh aspect,
V. 21, V.I. 27ter, V.I. 29, V.I. 17 Even in communication to the destination determined to perform communication, 14.4 is always used.
If communication at kb / s is established, V.V. 34 communication can be attempted, and the practicality can be improved.

[0031]

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

An NCU (network control unit) 2 connects to a terminal of the line in order to use the telephone network for data communication or the like,
It controls connection of a telephone exchange network, switches to a data communication path, and holds a loop. The NCU 2 connects the telephone line 2a to the telephone 4 when the signal level (signal line 20a) from the control circuit 20 is “0”, and connects the telephone line 2a when the signal level is “1”. It is connected to the facsimile machine side.
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 modem 8 is based on ITU-T Recommendation V. 8,
V. 21, V.I. 27ter, V.I. 29, V.I. 17, V.I.
34, and performs modulation and demodulation based on
Each transmission mode is designated by the signal line 20c. The modulator / demodulator 8 receives a signal output on a signal line 20b, outputs modulated data on a signal line 8a, receives a received signal output on a signal line 6a, and outputs demodulated data on a signal line 8b. Output.

The ANSam transmitting circuit 10 is a circuit for transmitting an ANSam signal. When the signal of the signal level "1" is output to the signal line 20d, the ANSam transmitting circuit 10 transmits the ANSam signal to the signal line 10a and outputs the ANSam signal to the signal line 20d. When the signal of the signal level “0” is being output, no signal is output to the signal line 10a.

The addition circuit 12 inputs 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.
a. The reading circuit 14 reads an image of a document and outputs the read image data to a signal line 14a. The recording circuit 16 is for sequentially recording information output to the signal line 20e line by line.

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

The paging signal detection circuit 22 is a circuit for detecting a paging signal from a line, and includes a signal line 2b (signal line 2a).
Signal is detected and the calling signal is detected, the signal line 2
A signal of signal level "1" is output to 2a, and if no call signal is detected, a signal of signal level "0" is output to signal line 22a.

The telephone number detection circuit 24 is a circuit for detecting a telephone number input from a line (signal line 2a) during the call signal, and receives a signal on the signal line 2b and outputs the telephone number between the call signals. The information is output to the signal line 24a.

The registration circuit 26 corresponds to the telephone number information between the calling signals, that is, the communication mode, specifically, V.V. 8, V.I. 34 communication, or 21, V.I. 2
7ter, V.I. 29, V.I. 17 Communication line 2
6a.

The operation unit 28 includes a one-touch dial, a speed dial, a start key, a set key, a numeric keypad,
It has a # key, a registration key to the registration circuit 26, and other function keys, and outputs pressed key information to the signal line 28a.

The control circuit 20 controls the entire facsimile apparatus. In this embodiment, in particular, in the initial state, the V.V. 8, V.I. After performing the communication and detecting an error during reception of the primary channel, if an error occurs in all frames up to the last frame for a predetermined number of consecutive times,
Thereafter, the V.V. 21, V.I. 27
ter. 29, V.I. 17 Communication is performed. here,
After an error is detected during the reception of the primary channel, if one frame is correctly received before a predetermined number of errors occur in all frames up to the last frame, the counter for the predetermined number of times is reset.

FIGS. 2 to 6 are flowcharts showing the operation of the control circuit 20 in the first embodiment of the present invention.

In FIG. 2, the operation starts at S0, and at S2
In this case, the registration circuit 26 is connected to all destinations via the signal line 26a. 8, V.I. 34 Communication is registered.

At S4, a signal of signal level "0" is output to the signal line 20a, and the CML is turned off. In S6,
A signal of signal level “0” is output to the signal line 20d,
The state where the Sam signal is not transmitted is set.

In S8, the information of the signal line 28 is inputted, and it is determined whether or not the registration to the registration circuit 26 is selected. When the registration is selected, the process proceeds to S10, and based on the information of the signal line 28a. , Corresponding to the destination; 8, V.I. 34 communication, or 21, V.I. 27ter, V.I. 29, V.I. 17 The registration circuit 26 registers whether communication is to be performed, and proceeds to S12. If the registration has not been selected, the process proceeds directly to S12.

In S12, information on the signal line 22a is input, and it is determined whether or not a calling signal is detected. If a calling signal is detected, the process proceeds to S16. If no calling signal is detected, the process proceeds to S14. Perform other processing.

In S16, the information of the signal line 24a is input, and it is determined whether or not the telephone number between the call signals has been detected.
If detected, the process proceeds to S18, the telephone number between the call signals is stored, and if not detected, the process proceeds to S24.

In S20, it is determined whether or not the telephone number between the call signals is registered in the registration circuit 26. If the telephone number is registered, the process proceeds to S22, and if not, the process proceeds to S24.

At S22, it is determined what kind of communication is registered in the registration circuit 26 corresponding to the telephone number between the call signals. 8, V.I. 34 communications are registered,
Proceed to S32. 21, V.I. 27ter, V.I. 29,
V. If the communication has been registered as 17 communication, the process proceeds to S24.

At S24, a signal of signal level "1" is output to the signal line 20a, and the CML is turned on. In S26, V.V. 21 pre-procedure. 27ter, V.I. 2
9, V.I. 17 image signals are received. 21 Perform post-procedure. Thereafter, the process proceeds to S4.

At S32, a signal of signal level "1" is output to the signal line 20a, and the CML is turned on. In S34, the ANSam signal is transmitted. In S36, V.V. 8
It is determined whether or not the CM signal is detected.
The process proceeds to S38, and if not detected, the process proceeds to S38.

In S38, it is determined whether or not three seconds have elapsed since the start of the transmission of the ANSam signal. If not, the process proceeds to S34, where the transmission of the ANSam signal is continued. , S40, and stops transmitting the ANSam signal.

At S40, V.V. 21 NSI / CSI /
The DIS signal is transmitted. Here, V. 8 Declare that communication function exists. In S42, V.V. 21 NSS / TSI /
When the DCS signal is detected, the process proceeds to S44, and reception from this destination is performed according to V.30. 21, V.I. 27ter, V.I. 29, V.I.
17 is registered in the registration circuit 26 to communicate. If the NSS / TSI / DCS signal of No. 21 is not detected, S46
Proceed to.

At S46, V.V. 8 is detected, and whether V.8 is detected or not is determined. When the CI signal of No. 8 is detected, S52
To V. If the CI signal of No. 8 has not been detected, the process proceeds to S48.

In S48, V.V. 21 NSI / CSI /
After the transmission of the DIS signal is completed, it is determined whether or not three seconds have elapsed. If three seconds have elapsed, the process proceeds to S50. If three seconds have not elapsed, the process proceeds to S42.

In S50, it is determined whether 35 seconds have elapsed since the CML was turned on (call connection). If 35 seconds have elapsed, the process proceeds to S4, and if 35 seconds has not elapsed, S40 is reached.
Proceed to.

At S52, an ANSam signal is transmitted, and S
At 54, a CM signal is received, at S56, a JM signal is transmitted, and at S58, a CJ signal is received. Then, a line probing signal is received in S60, a long training signal is received in S62, and parameter exchange is performed in S64.

At S66, if an error is detected during the reception of the primary channel and all the frames up to the last frame are erroneous for a predetermined number of times (three times), thereafter, from this call destination telephone number, Receiving is performed by V. 2
1, V.I. 27ter, V.I. 29, V.I. For the process of performing the 17 communication, the counter (continuous error counter) for counting the predetermined number (three times) of continuous errors is cleared.

In S68, primary channel information is received, and in S70, it is determined whether control channel information is detected. Then, when the control channel information is detected, the process proceeds to S72, and when the control channel information is not detected, the process proceeds to S68.

In S72 and S74, the contents of the control channel information are determined, and the PPS-Q signal (Q; EO)
M, MPS, EOP), the process proceeds to S78, and if the signal is a CTJ signal, the process proceeds to S76.
A TR signal is transmitted, and if it is an EOR-Q signal, the process proceeds to S96.

In S78, it is determined whether or not there is an error frame in the received primary channel information. If there is an error frame, the process proceeds to S86, and if there is no error frame, the process proceeds to S80.

In S80, the continuous error counter cleared in S66 is cleared, and in S82, the transmission of the MCF signal on the control channel is represented.

In S84, the received PPS-Q signal is
It is determined whether or not the signal is a PPS-EOP signal.
If the signal is an OP signal, the process proceeds to S4. If the signal is not a PPS-EOP signal, the process proceeds to S6 to shift to reception of the next partial page.
Proceed to 8.

At S86, after the occurrence of an error frame at the time of receiving the primary channel, it is determined whether or not all frames are in error and the number of consecutive error frames is 5 or more. Go on, S
The value of the continuous error counter cleared at 66 is incremented by one, and the process proceeds to S90. If the response is a negative response, the process proceeds to S94, where a PPR signal is transmitted using a control channel signal, and the process proceeds to S68.

At S90, as a result of the increment at S88, it is determined whether or not the value of the continuous error counter is 3 or more. If the value is 3 or more, the process proceeds to S92. 21, V.I. 27ter, V.I. 29, V.I.
17 that communication is performed is registered in the registration circuit 26, and the process proceeds to S94. On the other hand, if it is less than 3, the process proceeds directly to S94.

In S96, the ERR signal is transmitted on the control channel, and in S98, the DCN signal is transmitted on the control channel. Thereafter, the process proceeds to S4.

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

The second embodiment is different from the first embodiment in that after an error is detected during reception of the primary channel, all frames up to the last frame are erroneous before a predetermined number of times (three times). If the frame is correctly detected after the error frame is detected, the counter for the predetermined number of times is reset.

FIG. 7 is a flowchart showing a part of the operation of the second embodiment that is different from that of the first embodiment (FIGS. 2 to 6).

In FIG. 7, S100 represents NO in S86. Then, in S102, in the reception of the primary channel, after the occurrence of an error frame,
It is determined whether or not there is a correctly received frame. If the response is an affirmative response, the process proceeds to S104, the value of the continuous error counter is cleared, and if the response is a negative response, the process proceeds to S106 (S94).

Next, a third embodiment of the present invention will be described.

FIG. 8 is a block diagram showing a configuration of a facsimile apparatus according to the third to fifth embodiments of the present invention.

In order to use the telephone network for data communication or the like, the NCU 102 controls the connection of the telephone switching network, switches to the data communication path, and holds the loop, in order to use the telephone network for data communication and the like. It is what you do. Also, N
If the signal level (signal line 120a) from the control circuit 120 is “0”, the CU 102 connects the telephone line 102a to the telephone set 104, and if the signal level is “1”,
The telephone line 102a is connected to the facsimile machine. In a normal state, the telephone line 102a is connected to the telephone 104.

Hybrid circuit 106 separates the transmission system signal and the reception system signal, sends the transmission signal from addition circuit 112 to telephone line 102a via NCU 102, and transmits the signal from the other party via NCU 102. The signal is received and sent to the modem 108 via the signal line 106a.

The modulator / demodulator 108 is compliant with ITU-T Recommendation V.
8, V.I. 21, V.I. 27ter, V.I. 29, V.I. 17,
V. The modulation and the demodulation are performed based on the signal line 34, and each transmission mode is designated by the signal line 120c. The modem 108 receives the signal output on the signal line 120b, outputs the modulated data on the signal line 108a, receives the received signal output on the signal line 106a, and outputs the demodulated data on the signal line 108b. Output. In addition, the line probing signal as a determination result in reception,
The information on the usable band is output to the signal line 108c. AN
The Sam sending circuit 110 is a circuit that sends an ANSam signal. When the signal of the signal level “1” is output to the signal line 120d, the Sam sending circuit 110 sends the ANSam signal to the signal line 110a, and sends the signal level to the signal line 120d. When the signal “0” is being output, no signal is output to the signal line 110a.

The addition circuit 112 inputs the information of the signal line 108a and the information of the signal line 110a, and outputs the result of the addition to the signal line 112a. Read circuit 114
Is for reading an image of a document and outputting the read image data to a signal line 114a. The recording circuit 116
The information output to the signal line 120e is sequentially recorded line by line.

The memory circuit 118 is used for storing raw information of read data or encoded information, and also for storing received information or decoded information.

The paging signal detection circuit 122 detects a paging signal from the line (signal line 102a).
When a call signal is detected and a call signal is detected, a signal of signal level "1" is output to the signal line 122a. When a call signal is not detected, a signal of signal level "0" is output to the signal line 122a. Output a signal.

The telephone number detection circuit 124 is a circuit for detecting a telephone number between call signals input from a line (signal line 102a), receives a signal on the signal line 102b, and detects telephone number information between call signals. Output to the signal line 124a.

The registration circuit 126 is a circuit for registering, via the signal line 126a, the used line band determined by the line probing, corresponding to the telephone number information between the call signals, that is, the call destination.

The control circuit 120 controls the entire facsimile apparatus.
When a call arrives, 8 procedures, V.I. When the available band is less than or equal to the predetermined band at the time of receiving the line probing signal, the communication is interrupted. 21 procedures, V.I. The control for executing the 27 ter image transmission is performed.

FIGS. 9 and 10 are flowcharts showing the operation of the control circuit 120 according to the third embodiment of the present invention.

In FIG. 9, the operation starts at S200,
In S202, V.V. The timer (V.27ter communication timer) for forcibly performing 27ter is cleared. Note that this timer does not become negative.

In S204, a signal of signal level "0" is output to signal line 120a, and CML is turned off. S206
Then, a signal of the signal level "0" is output to the signal line 120d, and the ANSAN signal is not transmitted.

At S208, information on the signal line 122a is input, and it is determined whether an incoming call is selected. If an incoming call is selected, the process proceeds to S212, and if an incoming call is not selected, the process proceeds to S2.
Proceed to 10 to perform other processing.

At S212, a signal of signal level "1" is output to signal line 120a, and CML is turned on. S214
Then, V. It is determined whether or not the 27.ter communication timer exceeds 0, and if it exceeds 0, the process proceeds to S216 and the subsequent steps. 27t
er communication is executed, and if it is 0, the process proceeds to S222 and thereafter,
V. 8, V.I. 34 communication is executed.

At S216, a pre-procedure is performed. here,
V. 21 with the DIS signal of V.21. 27ter 4800
b / s, 2400 b / s communication function is declared. S
218, The image signal is received by 27ter. In S220, V.V. 21 is performed, and S2 is performed.
Go to 04.

On the other hand, the transmission of the ANSam signal is performed in S222, the reception of the CM signal in S224, the transmission of the JM signal in S226, and the reception of the CJ signal in S228. In step S230, a line probing signal is received, and the result is determined in step S232.
If it is 400 Hz or more, the process proceeds to S234, 34 communication is continued, and if it is less than 2400 Hz, the process proceeds to S240,
Interrupt communication.

In step S234, a long training signal is received. In step S236, parameter exchange is performed. In step S238, transmission of a primary channel and transmission of a control channel are sequentially performed. Thereafter, the process proceeds to S104.

In S240, V.V. Set 10 minutes to the 27 ter communication timer. Then, in S242,
Since the line bandwidth used is narrow, 34, recording that the communication is interrupted as a communication result report. Thereafter, the process proceeds to S104.

Next, a fourth embodiment of the present invention will be described.

In the fourth embodiment, 8, V.I. 34, the usable bandwidth determined by receiving the line probing signal at the time of communication is sequentially registered corresponding to the destination,
When an incoming call is received, the destination information of the destination is determined, and the V.V. 8,
V. 34 communication, or 21, It is determined whether to execute the V27ter communication. That is, when the usable band exceeds the predetermined band, V.V. 8, V.I. 34 communication,
When the frequency is below the predetermined band, 21, V.I. 27ter
Perform communication.

FIGS. 11 and 12 are flowcharts showing portions of the operation of the fourth embodiment which are different from those of the third embodiment (FIGS. 9 and 10).

In FIG. 11, S250 is the same as S200.
Is represented. Then, in S252, the signal line 126a
, All the contents of the registration circuit 126 are cleared. Thereafter, in S254, the process proceeds to S204.

S256 is YES in S208.
Is represented. In step S258, if there is telephone number information between the call signals, the telephone number information is stored. Next, S260
Then, it is determined whether or not the destination detected in S258 is registered in the registration circuit 126.
The process proceeds to S262, and if not registered, the process proceeds to S262.

At S262, a signal of signal level "1" is output to signal line 120a, and CML is turned on. And
In S264, the process proceeds to S222.

In step S266, it is determined whether or not the line bandwidth registered in the destination registration circuit 126 detected in step S258 is equal to or higher than 2400 Hz.
If it is above, the process proceeds to S262, and if it is less than 2400 Hz, the process proceeds to S268.

In S268, a signal of signal level "1" is output to the signal line 120a to turn on CML. Then, in S270, the process proceeds to S216.

Step S272 represents step S230. Then, in S274, corresponding to the call destination detected in S258, it is registered in the used circuit band registration circuit 126 detected by the reception of the line probing. After this, S2
In 76, the process proceeds to S234.

Next, a fifth embodiment of the present invention will be described.

In the fifth embodiment, when an incoming call is received, 8 procedures, V.I. If the available band is less than or equal to the predetermined band at the time of receiving the line probing signal, 21 procedure, and then 27
ter image transmission is executed.

FIG. 13 shows the operation of the fifth embodiment.
11 is a flowchart showing a portion different from the third embodiment (FIGS. 9 and 10).

In FIG. 13, S280 is the same as S20.
0 and S282 represent the above S204, S284 represents the above S212, and S286 represents the above S222.
That is, in the present embodiment, by directly proceeding from S200 to S204 and directly proceeding from S212 to S222,
V. The processing by the 27 ter communication timer is not performed.

S288 represents NO in S232. Then, in S290, V.V. 21 NSF /
The CSI / DIS signal is transmitted. Here, V.V. 4800b / s of 27ter, 2400b
Notify only of the / s receiving function.

Next, in S292, V.V. 21 NSS /
The TSI / DCS signal is received. Then, in S94, V.V. 21. The pre-procedure based on V.21 is performed. 27t
er image transmission. The post-procedure is sequentially performed based on No. 21, and the process proceeds to S204 in S300.

Next, a sixth embodiment of the present invention will be described.

FIG. 14 is a block diagram showing a configuration of a facsimile apparatus according to the sixth and seventh embodiments of the present invention.

In order to use the telephone network for data communication and the like, the NCU 202 controls the connection of the telephone exchange network, switches to the data communication path, and holds the loop, in order to use the telephone network for data communication and the like. It is what you do. Also, N
If the signal level (signal line 220a) from the control circuit 220 is “0”, the CU 202 connects the telephone line 202a to the telephone set 204, and if the signal level is “1”,
The telephone line 202a is connected to the facsimile machine side. In a normal state, the telephone line 202a is connected to the telephone 204.

The hybrid circuit 206 separates the transmission system signal and the reception system signal, sends the transmission signal from the addition circuit 212 to the telephone line 202a via the NCU 202, and sends the signal from the other party via the NCU 202. The signal is received and sent to the modem 208 via the signal line 206a.

The modem 208 is based on ITU-T Recommendation V.
8, V.I. 21, V.I. 27ter, V.I. 29, V.I. 17,
V. The modulation and demodulation are performed based on the signal line 34, and each transmission mode is designated by the signal line 220c. The modulator / demodulator 208 receives the signal output on the signal line 220b, outputs the modulated data on the signal line 208a, receives the received signal output on the signal line 206a, and outputs the demodulated data on the signal line 208b. Output.

The ANSam sending circuit 210 outputs the ANSam
This is a circuit for transmitting a signal. When a signal of signal level “1” is output to the signal line 220 d, the signal line 210
a when the signal of the signal level “0” is output to the signal line 220 d,
No signal is output at 0a.

The addition circuit 212 inputs the information of the signal line 208a and the information of the signal line 210a, and outputs the result of the addition to the signal line 212a. Read circuit 214
Is for reading an image of a document and outputting the read image data to a signal line 214a. The recording circuit 216
The information output to the signal line 220e is sequentially recorded line by line.

The memory circuit 218 is used to store raw information of read data or encoded information, and also stores received information or decoded information.

When a calling command pulse is generated on the signal line 20g, the calling circuit 222 outputs the telephone number selection signal output on the signal line 220f to the signal line 202b.

The registration circuit 224 includes a one-touch dial,
A circuit for registering a communication mode and a counter (used as a communication error counter and a communication establishment counter) corresponding to the destination of the abbreviated dialing, and is input / output via a signal line 224a.

The control circuit 220 controls the entire facsimile apparatus.
V. 8, V.I. 34 After starting communication and transmitting a line probing signal, if a response signal cannot be received from the partner device, the line is disconnected, and after a predetermined time has elapsed, a call is automatically sent to the destination and retransmission is performed. Control. Then, when this retransmission is performed, 21, V.I. It is controlled so as to be 27 ter communication.

FIGS. 15 to 17 are flowcharts showing the operation of the control circuit 220 in the sixth embodiment.

First, the operation starts in S400,
At 402, a signal of signal level "0" is output to the signal line 220a, and the CML is turned off. In S404, a signal of signal level “0” is output to the signal line 220d,
The state where the Sam signal is not transmitted is set.

Next, in S406, it is determined whether or not an automatic call is selected by an operation unit not shown in FIG.
If selected, the process proceeds to S410; if not selected, S4
In step 08, other processing is performed.

At S410, 0 is set to a call counter for counting the number of calls. In S412, the calling circuit 222 is used to make a call to the designated destination. S41
In 3, the signal of the signal level "1" is output to the signal line 220a, and the CML is turned on.

Next, the reception of the ANSam signal is performed in S414, the reception of the CM signal in S416, the reception of the JM signal in S418, and the transmission of the CJ signal in S420.

Next, S422 represents transmission of a line probing signal. In S422, it is determined whether or not a response signal INFOh signal to the line probing signal has been received.
To S432 if the INFOh signal has not been received.
Proceed to.

In S426, a long training signal is received, in S428, parameter exchange is performed, and in S430, transmission of the primary channel and transmission of the control channel are sequentially performed. Thereafter, the process proceeds to S402.

In step S432, a signal of signal level "0" is output to the signal line 232a to turn off the CML.
At 34, the value of the call counter is incremented by one.

In S436, it is determined whether the call counter is 3 or more, and if it is 3 or more, the flow proceeds to S402.

If it is less than 3, the process proceeds to S438, and 1
After waiting for one minute, in S440, the calling circuit 222 is used to redial the currently called destination.

Next, in S442, a signal of signal level "1" is output to the signal line 220a to turn on the CML, and in S44
In V.4, The pre-procedure according to 21 is performed. Here, V. 2
1 by the DCS signal. 4800b / 27ter
Select s. If fallback occurs in the training TCF signal, transmission at 2400 b / s is selected. Then, in S446, V.V. 27ter
Is transmitted in step S448. A post-procedure according to 21 is performed. Thereafter, the process proceeds to S402.

Next, a seventh embodiment of the present invention will be described.

In the seventh embodiment, the initial state is as follows.
V. corresponding to the call destination 8, V.I. 34, it is registered that the communication is to be executed, and after the call is actually selected and the line probing signal is transmitted, if the communication that cannot receive the response signal from the other party continues twice, Outgoing calls to the destination can be 21, V.I. 27 ter communication.

In the seventh embodiment, the V.V. 21,
V. In the communication to the call destination registered to perform the 27 ter communication, if the 4800 b / s communication is established without error for five consecutive times, the V. 27 V communication is subsequently performed to the destination. 21,
V. 27ter, V.I. 29, V.I. 17 communication is performed, and communication is performed based on this information.

Further, in the seventh embodiment, V.V. 21,
V. 27ter, V.I. 29, V.I. 17 In communication to the call destination registered to perform communication, 5 times
When the communication of 4.4 kb / s is established without error, the destination is thereafter transmitted to the destination. 8, V.I. 34, the registration is performed, and the communication is executed based on this information.

FIGS. 18 and 19 show the operation of the control circuit 220 according to the seventh embodiment.
FIG. 18 is a flowchart showing a different part from FIGS.

In FIG. 18, S450 is the same as S400.
Is represented. Then, in S452, the signal line 424
circuit 224 to all destinations via V.a.
8, V.I. The counter is cleared for 34 communications. Thereafter, in S454, the process proceeds to S402.

Step S456 corresponds to step S413. In S458, the communication mode registered in the registration circuit 224 corresponding to the destination of the call is checked. 8, V.I. 34 communication (S460 (S4
Go to 14), 21, V.I. If the communication is 27 ter communication, the process proceeds to S462 (S444), and 21, V.I. 27
ter. 29, V.I. If it is 17 communication, the process proceeds to S464.

In S464, V. The pre-procedure according to 21 is performed. Here, the DC. 17, V.I. 29,
V. 27ter is selected from the high transmission speed. Then, in S466, the V.V. 17, V.I. 29, V.I. 27te
r, and in S468, V.r. The post-procedure at 21 is performed.

In S470, all pages are 14.4 kb /
It is determined whether or not the transmission is in s.
The process advances to S474, and if the answer is negative, the process advances to S472.

At S472, the counter value of the designated call destination of the registration circuit 224 is cleared via the signal line 224a. Thereafter, the process proceeds to S402 in S480.

In S474, the counter value of the designated call destination of the registration circuit 224 is incremented by one via the signal line 224a. Then, in S476, S4
It is determined whether or not the incremented counter value at 74 has become 5 or more.
If it is less than the above, the process proceeds to S402 in S480.

In S478, the V.V. signal corresponding to the destination specified by the registration circuit 224 via the signal line 224a is output. 8, V.I.
34 communications, the counter is reset and stored. Thereafter, the process proceeds to S402 in S480.

Next, step S482 represents step S448. Then, in S484, all pages are 4.8 kb.
/ S is determined, and if the response is an affirmative response, the process proceeds to S486; if the response is a negative response, the process proceeds to S472.

At S486, similarly to S474, the counter value of the designated call destination of the registration circuit 224 is incremented by one via the signal line 224a. And S
In 488, similarly to the above S76, it is determined whether or not the counter value incremented in the above S486 is 5 or more. If it is less than 5, the process proceeds to S492 (S402), and if it is 5 or more, the process proceeds to S490.

At S490, the address corresponding to the destination specified by the registration circuit 224 via the signal line 224a is set. 21,
V. 27ter, V.I. 29, V.I. 17 communications and the counter is reset and stored. Thereafter, S492 (S402)
Proceed to.

In S494, S430 is replaced with S49.
Reference numeral 6 represents the above S472. That is, in this embodiment, after the transmission of the primary channel and the transmission of the control channel are sequentially performed in step S494, the process does not directly proceed to step S402, but instead proceeds to step S496 via the signal line 224a. After the counter value is cleared, the process proceeds to S402 in S480.

S498 represents NO in S424. Then, in S500, the counter value of the designated call destination of the registration circuit 224 is set to 1 via the signal line 224a.
Increment by one.

Next, in S502, it is determined whether or not the counter value incremented in S500 is 2 or more.
If it is 2 or more, the process proceeds to S504, and if it is less than 2, S50.
In S6, the process proceeds to S402.

At S504, the address corresponding to the destination specified by the registration circuit 224 via the signal line 224a is set. 21,
V. 27 ter communication is performed, and the counter is reset and stored. Thereafter, the process proceeds to S402 in S506.

[0148]

As described above, according to the first and second aspects of the present invention, it is highly likely that one error affects all subsequent frames from a destination with many instantaneous interruptions. . V.34 communication, one error affects only a few subsequent frames. 27ter, V.I. 29,
V. Since 17 communication is performed, it is possible to reliably perform communication even from a destination where instantaneous interruption frequently occurs depending on the line condition.

Further, according to the third invention of the present application, the V.V. 34, it is possible to realize communication with emphasis on communication.

Further, according to the fourth invention of the present application, the usable band is very narrow, and V.V. 34 communication is impossible, the communication is cut off, and when the partner transmitter retransmits, the V.34 at 1200 baud or 1600 baud. By performing the 27ter communication, the communication can be reliably performed.

Further, according to the fifth and sixth aspects of the present invention, reception from a destination having a narrow usable band is performed according to the method described in V.11. 21, communication. 27ter communication can be reliably executed, and reception from a destination having a wide usable bandwidth is performed according to the V.27 ter communication. 8, V.I. 34 communications.

Further, according to the seventh aspect of the present application, when the usable bandwidth is narrow in one communication, the V.V. 8, V.I. 34 communication. 21, V.I. It is possible to fall back to the 27 ter communication, and secure the communication.

According to the eighth invention of the present application, the V.V.
8 When the full-duplex procedure is established, line probing is not established because full-duplex communication is disabled, but line probing is not established because the available bandwidth is narrow. , In the redial, 27ter (1600 baud at 4800 b / s,
Since communication is started at 1200 baud at 2400 b / s), fallback does not occur even on a line with a narrow available band, so that communication can be executed reliably and in a short procedure time.

Further, according to the ninth invention of the present application, communication to a destination having a narrow line band corresponding to a call destination can be immediately performed according to V.30. 27ter communication becomes possible, the time required for the pre-procedure can be shortened, and communication can be reliably performed.
High-speed 33.6 kb communication to destinations with wide bandwidth
V./s. 34 communication becomes possible.

Further, according to the tenth aspect of the present invention, even in communication to a destination determined to have a narrow line bandwidth,
If communication of 4800 b / s is always established, communication at a higher transmission rate can be attempted, and practicality can be improved.

Also, according to the eleventh invention of the present application,
V. 21, V.I. 27ter, V.I. 29, V.I. 17 Even in communication to the destination determined to perform communication, 14.4 is always used.
If communication at kb / s is established, V.V. 34 communication can be attempted, and the practicality can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of first and second embodiments of the present invention.

FIG. 2 is a flowchart showing the operation of the first embodiment.

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

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

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

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

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

FIG. 8 is a block diagram showing a configuration of a third, a fourth, and a fifth embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the third embodiment.

FIG. 10 is a flowchart showing the operation of the third embodiment.

FIG. 11 is a flowchart showing the operation of the fourth embodiment.

FIG. 12 is a flowchart showing the operation of the fourth embodiment.

FIG. 13 is a flowchart showing the operation of the fifth embodiment.

FIG. 14 is a block diagram showing a configuration of a sixth and a seventh embodiment of the present invention.

FIG. 15 is a flowchart showing the operation of the sixth embodiment.

FIG. 16 is a flowchart showing the operation of the sixth embodiment.

FIG. 17 is a flowchart showing the operation of the sixth embodiment.

FIG. 18 is a flowchart showing the operation of the seventh embodiment.

FIG. 19 is a flowchart showing the operation of the seventh embodiment.

[Explanation of symbols]

 2, 102, 202 ... NCU, 4, 104, 204 ... telephone, 6, 106, 206 ... hybrid circuit, 8, 108, 208 ... modem, 10, 110, 210 ... ANSam transmission circuit, 12, 112, 212 ... Addition circuits, 14, 114, 214 ... reading circuits, 16, 116, 216 ... recording circuits, 18, 118, 218 ... memory circuits, 20, 120, 220 ... control circuits, 22, 122 ... calling signal detection circuits, 24, 124: telephone number detection circuit, 26, 126, 224: registration circuit, 28: operation unit, 222: calling circuit.

Claims (11)

[Claims] 1. A facsimile apparatus capable of detecting call destination telephone number information before a call is connected. 8, V.I. 34 communication means; and ITU-T Recommendations V21 and V.34. 27ter, V.I. 29,
V. V.17 communication means and V.17 corresponding to the called telephone number. 8, V.I. 34 communication, or 21, V.I. 27ter, V.I. 29, V.I. 1
And a registration unit for registering whether to execute the communication. 8, V.I. 34, it is registered to execute communication, and after detecting an error during reception of the primary channel, if errors occur in all frames up to the last frame after a predetermined number of consecutive occurrences, the subsequent V. corresponding to the called telephone number. 21, V.I. 2
7ter, V.I. 29, V.I. 17. A facsimile apparatus, which is registered to execute communication. 2. The method according to claim 1, wherein after detecting an error during reception of the primary channel, if one frame is correctly received before a predetermined number of errors occur in all frames up to the last frame, the predetermined number of times A facsimile apparatus for resetting a counter for counting the number of times. 3. The method according to claim 1, wherein, after detecting an error during reception of the primary channel, before a predetermined number of times that all frames have errors until the last frame, a correct frame is detected after the error frame. Resets a counter for counting the predetermined number of times. 4. ITU-T Recommendation V. 27ter, V.I. 2
9, V.I. 17, V.I. In a facsimile apparatus capable of transmitting 34 pictures, when an incoming call is received, ITU-T Recommendation V.34 8 procedures, V.I. Shift to execution of 34 image transmission, and upon receiving the line probing signal,
If the available bandwidth is less than the predetermined bandwidth, interrupt the communication,
Incoming calls within a predetermined time after that are in accordance with ITU-T Recommendation V. 21
Procedure, V.E. A facsimile apparatus for performing 27 ter image transmission. 5. The method according to ITU-T Recommendation V.5. 27ter, V.I. 2
9, V.I. 17, V.I. 34. A facsimile apparatus capable of transmitting 34 pictures, comprising: detecting means for detecting a destination of a calling side before a call connection; and registering means for registering an available band corresponding to the destination of the calling destination. -T Recommendation V. 8, V.I. 34, the available bandwidth determined by receiving the line probing signal at the time of communication is registered corresponding to the destination of the call destination, and at the time of the incoming call, the destination information of the other party is determined, and Depending on the registered available bandwidth, the above V.V. 8, V.I. 34 communication or ITU-T Recommendation V.34. 21, V.I. A facsimile machine for determining whether to execute 27 ter communication. 6. The method according to claim 5, wherein when an available band exceeds a predetermined band, the V.V. 8,
V. 34 communication is performed, and when the predetermined band is below,
V. 21, V.I. A facsimile apparatus for performing 27 ter communication. 7. ITU-T Recommendation V.7. 27ter, V.I. 2
9, V.I. 17, V.I. In a facsimile apparatus capable of transmitting 34 pictures, when an incoming call is received, ITU-T Recommendation V.34 8 procedures, V.I. When the available band is equal to or less than the predetermined band at the time of receiving the line probing signal, 21 procedure, and then A facsimile apparatus for performing 27 ter image transmission. 8. ITU-T Recommendation V. 8, V.I. 34. A facsimile apparatus capable of communication. 8, V.I. After starting the communication and transmitting the line probing signal, if the response signal from the partner device cannot be received, the line is disconnected, and after a predetermined time elapses, an automatic call is made to the same destination and retransmission is performed. At the time of this retransmission, ITU-T Recommendation V. 21, V.I. A facsimile apparatus for performing 27 ter communication. 9. According to the ITU-T Recommendation V.10 corresponding to the call destination.
8, V.I. 34 communication, or according to ITU-T Recommendation V.34. 2
1, V.I. V.27ter having means for registering whether to execute 27ter communication. 8, V.I. In a facsimile apparatus capable of communication, the initial state is V.34 corresponding to the call destination. 8, V.I. 34
If the communication is registered and the call is actually selected, the line probing signal is transmitted, and the response signal from the other party cannot be received multiple times, the same destination The call to 21, V.I. 27
A facsimile apparatus characterized by ter communication. 10. The method according to claim 9, wherein 21, V.I. In communication to a call destination registered to perform 27 ter communication, 4800
b / s communication is established, the ITU-T Rec. 21, V.I. 27ter, V.I. 2
9, V.I. 17. A facsimile apparatus which registers to perform communication and executes communication based on the registration information. 11. The method according to claim 10, wherein 21, V.I. 27ter, V.I. 29, V.I. In the communication to the call destination registered to perform the 17 communication, if the communication of 14.4 kb / s is established continuously for a predetermined number of times,
After that, the destination is 8, V.I. 34. A facsimile apparatus which registers to perform communication and executes communication based on the registration information.