JPH08214136A - Facsimile equipment - Google Patents

Abstract

PURPOSE: To obtain the facsimile equipment in which the ITU-T recommendations V.8 protocol is effectively utilized. CONSTITUTION: When a JM signal from a called terminal equipment cannot received for a period while transmission of a CM signal from a caller terminal equipment is consecutive for a prescribed time, the transmission system is switched so as to receive the JM signal from the called terminal equipment is received by a semi-duplex transmission system after the end of transmission of the CM signal. After the reception of the JM signal, a CJ signal is sent and when the called terminal equipment cannot receive the CM and CJ signals during the transmission of the JM signal, the transmission period of the JM signal is extended. The transmission system is switched to receive the CJ signal from the caller terminal equipment is received by the semi-duplex transmission system after the end of transmission of the JM signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine.

[0002]

2. Description of the Related Art In 1994, ITU-T Recommendation V. 8 is established, and in Recommendation SG14, V. It has been decided to execute the procedure defined in 8 in full-duplex communication. This V. It is considered to apply the eight procedures to a facsimile machine.

This V. In the eight procedures, when a call is made, the called terminal sends an ANSam signal, and when the calling terminal receives the ANSam signal from the called terminal, a CM signal is sent to the called terminal and the called terminal sends a CM signal. When receiving, the JM signal is transmitted, and when the calling terminal receives the JM signal, it transmits a CJ signal indicating confirmation of the JM signal to the called terminal.
When the called terminal receives the CJ signal, the V.V. 8. The procedure ends.

This V. CM, JM, specified in 8 procedures
The terminal is identified by each CJ signal, and the line used on the network side and the available transmission rate are determined.
V. By applying 8 procedures to a facsimile machine,
It is assumed that the effects of easily constructing functions such as terminal identification, network side line determination, and transmission rate determination will be obtained.

[0005]

However, V.I. Since the full-duplex transmission method is added as a precondition to the 8 procedures, when the echo suppressor is not guaranteed to be in an appropriate state, V.8. 8 procedures may not be established. Therefore,
V. 8 is performed under the condition that the full-duplex transmission method is performed. In some cases, the transition to the subsequent procedure may not be performed due to the failure of the eight procedures, and the above effect may not be exhibited. It is considered difficult to effectively use the functions obtained by the 8 procedures.

The object of the present invention is to provide ITU-T Recommendation V. It is an object of the present invention to provide a facsimile apparatus that can effectively use the functions obtained by the 8 procedures.

[0007]

According to the first aspect of the present invention,
In the facsimile machine, ITU is used to communicate with the other party's machine.
-T Recommendation V. Initialize each procedure signal used to execute the procedure specified in 8 in full-duplex transmission mode, and set the transmission method of each procedure signal to full-duplex according to the reception status of each procedure signal. The feature is that the transmission method is switched to the half-duplex transmission method.

According to a second aspect of the present invention, in the facsimile apparatus according to the first aspect, when it is detected that one of the procedure signals cannot be received, the transmission method is set to the half-duplex transmission method. It is characterized by switching to.

A facsimile machine according to a third aspect is the facsimile machine according to the second aspect, wherein The procedure of No. 8 is, at the time of calling, receiving an ANSam signal designating the full-duplex transmission method from the partner device, transmitting a CM signal to the partner device, and receiving a JM signal from the partner device. The CJ signal is transmitted to the partner device.

According to a fourth aspect of the present invention, in the facsimile apparatus according to the third aspect, when the ANSam signal from the destination device is received when the full-duplex transmission method is held, the destination device receives the ANSam signal. A JM signal is received from the partner device at the same time as the CM signal is transmitted, and after the JM reception is completed, a CJ signal is transmitted to the partner device.

According to a fifth aspect of the present invention, in the facsimile apparatus according to the third aspect, the ANS from the destination device is used.
When an am signal is received, a CM signal is transmitted to the partner device, and when the JM signal cannot be received from the partner device at the end of the CM signal transmission period, the transmission method is half-duplex. The transmission method is switched to, the JM signal is received by the half-duplex transmission method, and after the reception of the JM signal, the CJ signal is transmitted by the half-duplex transmission method.

According to a sixth aspect of the present invention, in the facsimile apparatus according to the second aspect, the V. The procedure of No. 8 is, when an incoming call is received, transmitting an ANSam signal designating the full-duplex transmission method to the partner device, receiving a CM signal from the partner device, and transmitting a JM signal to the partner device. The CJ signal is received from the partner device.

According to a seventh aspect of the present invention, in the facsimile apparatus according to the sixth aspect, when the ANSam signal is transmitted to the destination device when the full-duplex transmission method is held, the CM from the destination device is transmitted. At the same time as receiving the signal, the JM signal is transmitted to the partner device, and after the JM transmission is completed, the CJ signal is received from the partner device.

According to an eighth aspect of the present invention, in the facsimile apparatus according to the sixth aspect, when the reception of the CM signal and the CJ signal from the destination device is detected at the end of the JM signal transmission period to the destination device. A transmission period of the JM signal is extended, and when the extended transmission period ends, the transmission system is switched to a half-duplex transmission system, and the CJ signal is received by the half-duplex transmission system. To do.

[0015]

In the facsimile apparatus according to the first aspect of the present invention, the facsimile apparatus according to the ITU-T recommendation V. Initialize each procedure signal used to execute the procedure specified in 8 in full-duplex transmission mode, and set the transmission method of each procedure signal to full-duplex according to the reception status of each procedure signal. Switch from the transmission method to the half-duplex transmission method.

In the facsimile apparatus according to the second aspect, when it is detected that any one of the procedure signals cannot be received, the transmission method is switched to the half-duplex transmission method.

In the facsimile machine according to the third aspect,
V. In the procedure of 8, when receiving a call, an ANSam signal designating a full-duplex transmission method from the partner device, a CM signal to the partner device, a JM signal from the partner device, a partner device The CJ signal is transmitted to.

In the facsimile apparatus according to the fourth aspect, when the full-duplex transmission method is maintained, the AN from the destination apparatus is used.
When the Sam signal is received, the JM signal is received from the partner device at the same time as the CM signal is transmitted to the partner device.
After receiving M, the CJ signal is transmitted to the partner device.

In the facsimile apparatus according to the fifth aspect, when the ANSam signal is received from the destination apparatus, the CM signal is transmitted to the destination apparatus, and the JM from the destination apparatus is sent at the end of the transmission period of the CM signal. When the signal reception failure is detected, the transmission method is switched to the half-duplex transmission method, the JM signal is received by the half-duplex transmission method, and after the reception of the JM signal, the CJ signal by the half-duplex transmission method is received. Send.

In the facsimile apparatus according to the sixth aspect,
V. In step 8, when receiving a call, an ANSam signal for designating a full-duplex transmission method to the destination device, a CM signal from the destination device, a JM signal to the destination device, a destination device To receive the CJ signal.

In the facsimile apparatus according to the seventh aspect, when the full-duplex transmission method is held, the other apparatus sends ANSa to the destination apparatus.
When the m signal is transmitted, the JM signal is transmitted to the partner device at the same time as the CM signal is received from the partner device, and after the JM transmission is completed, the CJ signal is received from the partner device.

In the facsimile apparatus according to the present invention, when it is detected that the CM signal and the CJ signal from the partner device cannot be received at the end of the JM signal transmission period to the partner device,
When the transmission period of the JM signal is extended and the extended transmission period ends, the transmission system is switched to the half-duplex transmission system, and the CJ signal is received by the half-duplex transmission system.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

First of all, the V.1 standard recommended by ITU-T is used. The procedure signal 8 will be briefly described.

V. The procedure signal 8 includes a calling menu signal (hereinafter referred to as CM), a CM terminal (hereinafter referred to as CJ), and a common menu signal (hereinafter referred to as JM).

CM is a signal transmitted from the calling DCE, and this signal is mainly used to indicate the modulation schemes available in the calling DEC. CM is recommended by V. The low-frequency channel V. It is composed of a 300 bit / s repetitive bit string modulated by 21 (L).

CJ is a signal indicating confirmation of detection of JM and end of CM. CJ is V. of 300 bit / s. 21
Modulated with (L), star and bit / s and stop bit /
It consists of all three consecutive "0" octets including s.

JM is a signal transmitted from the response DEC, and this signal is mainly used to indicate available modulation schemes common to the calling and response DECs. JM
Recommendation V. The high-frequency channel V. 21
It is composed of a 300-bit / s repetitive bit string modulated by (H).

(First Embodiment) A first embodiment of the present invention will be described with reference to the drawings. 1 is a block diagram showing the configuration of a first embodiment of a facsimile apparatus of the present invention, and FIG. 2 is a V.V. 8 shows the sequence of the procedure signal of FIG. 8, and FIG. 3 is a diagram showing the V.8 with switching to the half-duplex transmission system in the control circuit of the facsimile apparatus of FIG. It is a figure which shows the sequence of the procedure signal of 8.

The facsimile apparatus, as shown in FIG.
A network control device (hereinafter, NC) connected to the telephone line 2a
U. ) 2 is provided. The NCU 2 controls the connection of the telephone switching network, such as connecting the telephone network to a line terminal used for data communication, switches to the data communication path, connects the telephone line 2a to the telephone 4, and connects the telephone line. The connection between 2a and the hybrid circuit 6 is selectively switched. N
CU2 and telephone 4 are connected by signal line 2b, and NCU2
And the hybrid circuit 6 are connected by a signal line 2c. The switching operation of the NCU 2 is controlled by the control circuit 20 described later. When the control signal given from the control circuit 20 via the signal line 20a is "0", the telephone line 2a and the telephone 4 are connected. On the other hand, when the control signal is "1", the telephone line 2a and the hybrid circuit 6 are
Connection is made. In the normal state, the telephone line 2
The connection between a and the telephone 4 is selected.

The hybrid circuit 6 includes a transmission signal transmitted from the transmission system via the telephone line 2a and the telephone line 2a.
It separates from the received signal to the receiving system received via.

The transmission system is composed of an image pickup device such as a CCD (electrically coupled device) and an optical system and a reading circuit 14 and an ANS.
and an am sending circuit 10.

The reading circuit 14 sequentially reads an image of one line in the main scanning direction from the transmission original, and the data indicating the read image is output to the signal line 14a.

The ANSam transmission circuit 10 includes a control circuit 20.
When a signal of level "1" is given from the signal line 20d via the signal line 20d, the ANSam signal is output to the signal line 10a.
On the other hand, when the level “1” signal is applied from the control circuit 20 via the signal line 20d, the ANSam signal is not output to the signal line 10a.

The data output from the reading circuit 14 via the signal line 14a is given to the control circuit 20. The control circuit 20 performs an encoding process on the data taken in via the signal line 14a, and the encoded data is output to the modulator / demodulator 8 via the signal line 20b.

The modulator / demodulator 8 subjects the encoded data from the signal line 20b to modulation processing to generate a modulated signal, and demodulates the received signal taken in from the hybrid circuit 6 via the signal line 6a. Processing is performed to generate demodulated data. This modulation processing and demodulation processing is performed by IT
UT Recommendation V.5. 8, V.I. 21, V.I. 27ter, V.I. Two
9, V.I. 17, V.I. 34. Modem 8
The content of the modulation and demodulation processing by is designated by a signal given from the control circuit 20 through the signal line 20c, and the transmission mode is determined by the designated modulation and demodulation processing.

The modulated signal generated by the modulator / demodulator 8 is given to the adder circuit 12 via the signal line 8a. Adder circuit 1
2 adds the modulated signal from the modulator / demodulator 8 and the ANSam signal from the ANSam sending circuit 10. The added signal is output to the hybrid circuit 6 via the signal line 12a, and the hybrid circuit 6 sends the added signal as a transmission signal to the telephone line 2a via the NCU 2.

On the other hand, in the receiving system, N
The signal received via the CU 2 is output from the hybrid circuit 6 to the modulator / demodulator 8 via the signal line 6a. Modem 8
As described above, the demodulation processing is performed on the received signal taken in via the signal line 6a to generate demodulated data.
The demodulated data generated by the modulator / demodulator 8 is given to the control circuit 20 via the signal line 20c. The control circuit 20 performs processing such as decoding on the demodulated data, and the decoded data is given to the recording circuit 16 via the signal line 20e.

The recording circuit 16 sequentially records the image represented by the decoded data line by line on the recording paper.

The data read by the reading circuit 14, the data obtained by encoding the data, the received data, and the data obtained by decoding the data are stored in the memory circuit 18 as necessary.
Stored in.

The control circuit 20 receives information from the other party's device and performs transmission control for transmitting the information to the other party's device.

The transmission control procedure that defines this transmission control includes ITU-T Recommendation V.34. 8, V.I. 21, V.I. 27ter,
V. 29, V.I. 17, V.I. 34 procedures are used.

Specifically, V. 8 procedure is used for determining the transmission mode, etc. The signals defined by the eight procedures include CM, JM, and CJ signals. A full-duplex transmission method or a half-duplex transmission method is used for transmission of each signal, and those transmission methods are selected according to the transmission situation.

V. When performing 8 steps in full-duplex transmission system,
As shown in FIG. 2, first, when the called terminal transmits an ANSam signal and the calling terminal detects the ANSam signal, C
At the same time as transmitting the M signal, it receives the JM signal from the called terminal, and after receiving the JM signal, transmits the CJ signal,
When the called terminal detects the CM signal, it simultaneously receives the CJ signal and the JM signal.

On the other hand, when the JM signal from the called terminal cannot be received during the period in which the transmission of the CM signal from the calling terminal is continued for a predetermined time, as shown in FIG. The transmission method is switched so that the JM signal from the called terminal is received by the half-duplex transmission method after the completion of the signal transmission, and the CJ signal is transmitted after the reception of the JM signal, and the JM signal is transmitted at the called terminal. When the CM signal and the CJ signal cannot be received, the transmission period of the JM signal is extended, and after the transmission of the JM signal is completed, the CJ from the calling terminal is
The transmission scheme is switched to receive the signal in a half-duplex transmission scheme.

Full-duplex V.V. After completing the 8 steps, V. 21. V.21. 27ter, V.I. 29, V.I. 1
7 image transmission, that is, a procedure according to the half-duplex transmission method, image transmission, or V.7. 34, image transmission, that is, full-duplex procedure, and control for executing image transmission are performed. Which procedure or image transmission is set is determined by the functions of the calling terminal and the called terminal. To be done.

On the other hand, V.D. After completing the 8 steps, V. 21. V.21. 27ter, V.I. Two
9, V.I. The control for executing any one of the image transmissions of 17, that is, the procedure according to the half-duplex transmission method, and the image transmission is performed.

Next, the operation of the control circuit 20 in the facsimile apparatus of this embodiment will be described with reference to FIGS. 4 and 5. 4 and 5 are flowcharts showing the operation of the control circuit in the facsimile apparatus of FIG.

Referring to FIG. 4, first, step S32
Is executed. In step S32, a signal of level "0" is output to the signal line 20a and the CML is turned off.

In step S34, a signal of level "0" is output to the signal line 20d so that the ANSam signal is not output.

Next, step S36 is executed, and in step S36, it is determined whether or not the incoming call is selected.
If the incoming call is not selected, step S38 is executed, and if the incoming call is selected, step S42 is executed.

In step S38, it is determined whether or not the calling is selected. When calling is selected, step S68
When (as shown in FIG. 5) is executed and the call is not selected, step S40 is executed. In step S40, other processing is executed. After executing the other processing, the processing returns to step S32.

In step S42, a signal of level "1" is output to the signal line 20a and the CML is turned on.

After the execution of step S42, step S44
Is executed. In step S44, a signal of level "1" is output to the signal line 20d, and the ANSam signal transmission circuit 1
The transmission of the ANSam signal from 0 is started.

Then, step S46 and step S
48 is executed, and it is determined whether or not the CM signal from the calling terminal is received by the full-duplex transmission method by the time when the transmission of the ANSam signal is completed.

In step S46, when the CM signal is detected by the time when the transmission of the ANSam signal is completed, step S50 is executed, and in step S50, the transmission of the JM signal is started. Then, step S52 and step S54 are executed. In step S52, it is determined whether or not the CJ signal from the calling terminal is detected by the time when the transmission of the JM signal is completed, and in step S54, it is determined whether or not the transmission of the JM signal is completed.

When the CJ signal is detected, step S56
Is executed. In step S56, the V. 21 steps,
V. 27ter, V.I. 29, V.I. 17 image transmission, that is, a procedure according to the half-duplex transmission method, image transmission, or V.17. 34, image transmission, that is, the full-duplex procedure and image transmission are executed. After execution of step S56,
The process returns to step S32 again.

If the CJ signal is not detected by the end of the transmission of the JM signal, the transmission method is switched to the half-duplex transmission method based on the determination that the transmission by the full-duplex method is impossible, and step S58. Is executed. Step S58
Then, the transmission period of the JM signal is extended and the JM signal is transmitted for the extended period (for example, 1 second).

After the execution of step S58, step S64
Is executed. In step S64, the CJ signal is received by the half-duplex transmission method.

Then, step S66 is executed. 21. V.21. 27ter, V.I.
29, V.I. The image transmission of any one of 17 is executed, and the process returns to step S32.

In step S48, when the transmission of the ANSam signal is completed without the CM signal being detected, the transmission method is switched to the half-duplex transmission method based on the determination that the transmission by the full-duplex transmission method is impossible. Well, step S60 is executed.

In step S60, the C
Receive M signal. After receiving the CM signal, step S62
Is executed, and in step S62, the JM signal is transmitted for a predetermined time (for example, 3 seconds).

Next, steps S64 and S66.
Are sequentially executed.

When calling is selected in step S38, step S68 is executed as shown in FIG.
In step S68, a signal of level "1" is output to the signal line 20a and the CML is turned on.

After the execution of step S68, step S70
Is executed. In step S70, A from the called terminal
The NSam signal is received.

Then, step S72 is executed, and in step S72, the transmission of the CM signal is started.

After the transmission of the CM signal is started, steps S74 and S76 are executed to judge whether or not the JM signal from the called terminal is detected by the time when the transmission of the CM signal is completed. It is determined whether or not the CM signal from the calling terminal is received by the full-duplex transmission method by the time when the transmission of the ANSam signal is completed.

When the JM signal is detected by the time the transmission of the CM signal is completed in step S76, step S78
Is executed, and the CJ signal is transmitted in step S78.

Then, step S80 is executed. In step S80, the V. 21. V.21. 27ter,
V. 29, V.I. 17 image transmission, that is, a procedure according to the half-duplex transmission method, image transmission, or V.17. 34, image transmission, that is, the full-duplex procedure and image transmission are executed. After the execution of step S80, the process returns to step S32 (shown in FIG. 4) again.

In step S76, when the JM signal is not detected and the transmission of the CM signal is completed, the transmission method is switched to the half-duplex transmission method based on the determination that the transmission by the full-duplex method is impossible. , Step S82 is executed. In step S82, the JM signal is received.

After receiving the JM signal, step S84 is executed. In step S84, the CJ signal is transmitted by the half-duplex transmission method.

Then, step S86 is executed. 21. V.21. 27ter, V.I.
29, V.I. The image transmission of any one of 17, that is, the procedure according to the half-duplex transmission method and the image transmission are executed, and the process returns to step S32.

Next, the transmission control procedure according to the above-mentioned full-duplex transmission method will be described with reference to FIG. FIG. 6 is a diagram showing an example of a transmission control procedure applied to the facsimile apparatus of FIG.

Referring to FIG. 6, a signal (ANSam signal 2100 which enables full-duplex transmission from the called terminal).
A signal obtained by modulating Hz at 15 Hz) is transmitted. From the calling terminal, V. A CM signal by modulation based on 8 is transmitted, and the CM terminal notifies the called terminal of a transmission mode that can be executed during image transmission.

The called terminal which has received the CM signal notifies the calling terminal of the receivable transmission mode (V.34) among the transmission modes designated by the CM signal, and the JM signal is used for this notification. .

The calling terminal which has received the JM signal notifies the called terminal of the transmission mode by transmitting the CJ signal.

After the CJ signal is transmitted, that is, V. After 50 msec has passed after the completion of the procedure, the calling terminal is 34, the execution of the procedure is started, and a line probing signal (INFO0c is added to the head) for checking the status of the telephone line 2a is transmitted. The called terminal responds to the line probing signal from the calling terminal (leading I
(NFO0a is added) is sent, and this signal notifies the calling terminal of subsequent sending level, amplitude level correction, and transmission baud rate.

The calling terminal sends out a long training signal 50 msec after the lamp rubbing signal is sent out, and the called terminal performs adjustment of the equalizer of the modem and timing detection based on this long training signal. To do.

The calling terminal sends out a parameter exchange signal 50 msec after sending the long training signal. The called terminal sends a signal in response to the parameter exchange signal, and notifies the calling terminal of subsequent link correction and bit rate by this signal.

After responding to the parameter exchange signal, the called terminal sends out CSI and DIS signals, and the T from the calling terminal is transmitted.
Flags are sent out until the SI and DCS signals are received, and TS
After receiving the I and DCS signals, the CFR signal is transmitted. The calling terminal receives TSI, DC after receiving the CSI and DIS signals.
The S signal is transmitted, and the flag is transmitted until the CFR signal from the called terminal is received.

The calling terminal is 50 msec after sending the flag.
After the passage, V. The image transmission by 34 is started, and the image signal is transmitted. When 50 msec has passed after the end of the image signal transmission, the V.
34 is executed, and the calling terminal sends PPS-
The flag is transmitted until the MPS signal is transmitted and the MCF signal from the called terminal is received. The called terminal is PPS
-After receiving the MPS signal, the MCF signal is transmitted.

50 msec after sending the flag,
V. The image transmission by 34 is executed, and the image signal is again sent from the calling terminal. 50mse after image signal transmission is completed
After the lapse of c. The procedure according to 34 is executed, and the calling terminal sends a PPS-EOP signal and sends a flag until it receives the MCF signal. The called terminal is PPS-EOP
After receiving the signal, the MCF signal is transmitted. After that, the same procedure is repeated until the image transmission is completed.

As described above, the V.V. 8
Depending on the reception status of each signal in the procedure, if it is determined that transmission by the full-duplex transmission method is impossible, the transmission method is switched to the half-duplex method, so the echo suppressor is not adjusted to an appropriate state. Due to the full duplex transmission method. Before the 8 procedures are not established, the V. 8 steps can be established,
V. It is possible to effectively use the functions obtained by the 8 procedures.

For example, V.I. C specified in 8 procedures
The V.M., JM, and CJ signals cause V.M. 21, V.I. 27
ter, V.I. 29 half duplex, V.I. 17 communication, and V.17. It is possible to declare which one of 34 half-duplex communication is to be used, and to determine the usage time on the network side.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings.

The facsimile apparatus of this embodiment has the same structure as the facsimile apparatus of the first embodiment. It is set so as to identify the terminal by the procedure according to 8. This terminal identification is performed based on the value of the constituent bits of the calling function category defined by the CM signal.

Next, the operation of the control circuit in this embodiment will be described with reference to FIGS. 7 and 8. 7 and 8 are diagrams showing the operation of the control circuit in the second embodiment of the facsimile apparatus of the present invention. In this description, the first
Step S different from the embodiment will be described, and description of the same step S will be omitted.

Referring to FIG. 7, step S shown in FIG.
46, C by the end of transmission of the ANSam signal
When the M signal is detected, step S92 is executed. In step S92, the calling function category defined by the CM signal is checked, and if the bits b6 and b7 of the CM signal are set to "1", it is determined that the call destination is the data transmitting / receiving terminal. , Bit b6 of the CM signal is set to "1", the call destination is V. It is determined that the text phone is compliant with 18.

If the call destination is a data transmitting / receiving terminal, step S50 (shown in FIG. 4) is executed. On the other hand, the call destination is V. If the text phone complies with V.18, step S96 is executed, and V. The receiving operation corresponding to the 18-compliant text phone is performed.

In step S48 shown in FIG. 4, CM
When the transmission of the ANSam signal ends when no signal is detected, step S100 is executed as shown in FIG. In step S100, the calling function category defined by the CM signal is checked, and bits b6 and b7 of the CM signal are checked.
Are set to "1", it is determined that the call destination is a data transmission / reception terminal. When bit b6 of the CM signal is set to "1", the call destination is V.70. It is determined that the text phone is compliant with 18.

If the call destination is a data transmitting / receiving terminal, step S62 (shown in FIG. 4) is executed. On the other hand, the call destination is V. If it is a text phone conforming to V.18, step S104 is executed, and V.I. The receiving operation corresponding to the 18-compliant text phone is performed.

As described above, the terminal can be identified according to the value of the constituent bits of the CM signal. Further, this terminal identification is surely established when either the full-duplex transmission method or the half-twentieth transmission method is selected, and the occurrence of an error in the initial identification can be eliminated.

[0093]

As described above, according to the facsimile apparatus according to claims 1 to 3 and 6, the facsimile apparatus according to the ITU-T Recommendation V.3 is communicated with the destination apparatus. Initialize each procedure signal used to execute the procedure defined in 8 in full-duplex transmission mode, and set the transmission method of each procedure signal to full-duplex according to the reception status of each procedure signal. Since the transmission method is switched to the half-duplex transmission method, the echo suppressor is not adjusted to an appropriate state. Before the 8 procedures are not established, the V. 8 procedures can be established, and ITU-T Recommendation V.8 can be established. It is possible to effectively use the functions obtained by the 8 procedures.

According to the facsimile apparatus of the fourth and fifth aspects, the V.2 format according to the full-duplex transmission method at the time of calling. 8
V. of each procedure signal and switching to the half-duplex transmission system. It is possible to clearly distinguish it from the sequence of 8 procedural signals.

According to the seventh and eighth aspects of the facsimile apparatus, the V.D. 8
V. of each procedure signal and switching to the half-duplex transmission system. It is possible to clearly distinguish it from the sequence of 8 procedural signals.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating a V.V. It is a figure which shows the sequence of the procedure signal of 8.

FIG. 3 is a diagram illustrating a V.V. with switching to a half-duplex transmission system in a control circuit of the facsimile apparatus in FIG. It is a figure which shows the sequence of the procedure signal of 8.

4 is a flowchart showing an operation of a control circuit in the facsimile apparatus of FIG.

5 is a flowchart showing an operation of a control circuit in the facsimile apparatus of FIG.

6 is a diagram showing an example of a transmission control procedure applied to the facsimile apparatus of FIG.

FIG. 7 is a diagram showing an operation of a control circuit in the second embodiment of the facsimile apparatus of the present invention.

FIG. 8 is a diagram showing an operation of a control circuit in the second embodiment of the facsimile apparatus of the present invention.

[Explanation of Codes] 2 NCU 6 Hybrid Circuit 8 Modulator / Demodulator 10 ANSam Sending Circuit 12 Adder Circuit 20 Control Circuit

Claims (8)

[Claims] 1. An ITU-T Recommendation V.3 with a partner device.
Initialize each procedure signal used to execute the procedure specified in 8 in full-duplex transmission mode, and set the transmission method of each procedure signal to full-duplex according to the reception status of each procedure signal. A facsimile machine characterized by switching from a transmission system to a half-duplex transmission system. 2. The facsimile apparatus according to claim 1, wherein when it is detected that any one of the procedure signals cannot be received, the transmission method is switched to the half-duplex transmission method. 3. The V. The procedure of 8 is ANSam for designating the full-duplex transmission method from the partner device at the time of calling.
3. The facsimile apparatus according to claim 2, wherein a signal is received, a CM signal is transmitted to the partner device, a JM signal is received from the partner device, and a CJ signal is transmitted to the partner device. . 4. When the full-duplex transmission method is maintained,
When receiving the ANSam signal from the other party's device, at the same time as transmitting the CM signal to the other party's device, the JM signal from the other party's device is received.
4. The facsimile apparatus according to claim 3, wherein a CJ signal is transmitted to the destination apparatus. 5. Upon receiving an ANSam signal from the partner device, a CM signal is transmitted to the partner device, and at the end of the CM signal transmission period, the JM signal cannot be received from the partner device. When the transmission is detected, the transmission system is switched to the half-duplex transmission system, the JM signal is received by the half-duplex transmission system, and after the reception of the JM signal is completed, the CJ signal by the half-duplex transmission system is received. 4. The facsimile apparatus according to claim 3, wherein the facsimile apparatus transmits the following. 6. The V. The procedure of No. 8 is, when an incoming call is received, transmitting an ANSam signal designating the full-duplex transmission method to the partner device, receiving a CM signal from the partner device, and transmitting a JM signal to the partner device. 3. The facsimile apparatus according to claim 2, wherein the facsimile apparatus receives a CJ signal from the destination apparatus. 7. When the full-duplex transmission method is maintained,
When an ANSam signal is transmitted to the partner device, a JM signal is transmitted to the partner device at the same time as a CM signal is received from the partner device, and after the JM transmission is completed, a CJ signal from the partner device is transmitted. 7. The facsimile apparatus according to claim 6, wherein the facsimile apparatus receives the message. 8. When the reception failure of the CM signal and the CJ signal from the partner device is detected at the end of the JM signal transmission period to the partner device, the JM signal transmission period is extended and the extended transmission period is extended. 7. The facsimile apparatus according to claim 6, wherein the transmission system is switched to a half-duplex transmission system when the process ends, and the CJ signal is received by the half-duplex transmission system.