JP3513356B2 - Communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device such as a facsimile device which communicates based on ITU-T recommendation.

[0002]

2. Description of the Related Art For example, the conventional V. 8, V.I. In the facsimile machine having the 34 communication function, the training signal (S, S _* , PP, TRN signal) is received in the pre-procedure, and the resync signal (S, S _* , PP, B1) is received in the transmission of the primary channel. I was receiving. In addition, S
_* Indicates a phase inversion signal of S, and is shown by adding an overline to S in the drawings described later.

[0003]

By the way, in the above-described operation, when the receiver cannot correctly demodulate the information of the primary channel, the receiver notifies the transmitter of a reception frame requesting retransmission by the PPR signal. The transmitter transmits the erroneous frame as information of the primary channel after the resync signal.

However, since only the resync signal is transmitted immediately before the information of the primary channel, the receiver may not be able to receive the information of the primary channel no matter how many times it is retransmitted.

Therefore, it is an object of the present invention to provide a communication device capable of increasing the certainty when receiving primary channel information.

[0006]

[0007]

[0008]

[0009]

[0010]

[0011]

The first invention of the present application is
It has a first communication function and a second communication function included in the ITU-T recommendation, and when the image signal is received, the transition condition to the reception of the control signal is set to the first communication function and the second communication function. It is characterized by changing with. In the second invention of the present application, the first communication function is the ITU-T recommendation V.264. 21, V.I. Two
7 ter, V.I. 29, V.I. 17 is a communication function based on the ITU-T Recommendation V.17. 8,
V. It is characterized by a communication function based on 34.

Further, in the third invention of the present application, during the communication by the first communication function, the transition from the reception of the image signal to the reception of the control signal is performed by detecting the RCP signal or a signal of a predetermined time or more. The detection is performed without energy, and during the communication by the second communication function, the transition from the reception of the image signal to the reception of the control signal is performed by detecting the RCP signal or
It is characterized in that it is performed by detecting a change in the energy spectrum.

In the fourth invention of the present application, the predetermined time is 1 second, and the energy spectrum is 6 seconds.
It is characterized by detecting energy from 00 Hz to 1800 Hz and determining energy from 1800 Hz to 3000 Hz.

In addition, a fifth invention of the present application is that, when an image signal is received, a transition condition for receiving a control signal is set in accordance with ITU-T Recommendation V.5. 21, V.I. 27 ter, V.I. 29, V.I. First communication function based on ITU-T Recommendation V.17. 8, V.I. Three
The second communication function based on No. 4 is used.

The sixth invention of the present application is the ITU-T
Start receiving the information of the primary channel based on the recommendation and when receiving a valid 1 frame, set the training disable to the modem to ON and detect the RCP signal or the signal other than the information of the primary channel. Then, the training disable to the modem is set to be turned off, and at the same time, the instantaneous interruption during the information reception of the primary channel is checked.

Further, the seventh invention of the present application is such that the training disable for the modem is turned off in accordance with the amount of information of the primary channel and / or the amount of instantaneous interruption during reception of the primary channel information. Characterized by changing the timing.

The eighth invention of the present application is characterized in that the larger the amount of information on the primary channel, the later the setting for turning off the training disable for the modem is delayed. The ninth invention of the present application is characterized in that the setting for turning off the training disable for the modem is delayed as the amount of the instantaneous interruption during the reception of the primary channel information increases. The tenth invention of the present application is the ITU-T Recommendation V.10. 8, V.I. It is a facsimile machine having a 34 communication function.

The eleventh invention of the present application is the ITU-
After receiving the information of the primary channel based on the T recommendation and receiving one valid frame, the training disable setting to the modem is set to ON, and the RCP signal is detected or a signal other than the information of the primary channel is set. When it is detected, the setting to turn off the training disable to the modem is made, and at the same time, the instantaneous interruption during the information reception of the primary channel is checked.

[0019]

[0020]

[0021]

Further, in the above-mentioned first to fifth inventions, for example, ITU-T Recommendation V.3 is provided. 21, V.I. 27 ter , V.I. Two
9, V.I. Also in the communication of ITU-T Recommendation V.17. 8, V.
Even in the communication of No. 34 , if the RCP signal cannot be received due to divergence at the time of receiving the image signal, the control signal can be surely shifted to, and the communication can be continued.

In the sixth to eleventh inventions described above,
When there are many momentary interruptions, the reception of the primary channel does not end, so priority is given to receiving the primary channel.When there are few interruptions, there are few errors in receiving the primary channel, so priority is given to receiving the control channel. It will be possible.

Further, when the amount of received information is large, the reception priority timing of the control channel is delayed, errors during reception of the primary channel are reduced, and the control channel can be surely received. On the other hand, when the amount of received information is small, the probability of occurrence of a momentary interruption during reception of the primary channel is small, and it is considered that there are few errors during reception of the primary channel. Therefore, highly reliable communication becomes possible in consideration of communication time.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of a facsimile machine according to first to third embodiments of the present invention.

The NCU (network control unit) 2 is connected to the terminal of the line in order to use the telephone network for data communication and the like,
It controls the connection of the telephone switching network, switches to the data communication path, and holds the loop. Further, the NCU 2 connects the telephone line 2a to the telephone 4 side if the signal level (signal line 20a) from the control circuit 20 is "0", and connects the telephone line 2a if the signal level is "1". It is connected to the facsimile machine side.
In the 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 adder circuit 12 to the telephone line 2a via the NCU2, and sends the signal from the partner side via the NCU2. The signal is received and sent to the modulator / demodulator 8 via the signal line 6a.

The modulator / demodulator 8 complies with ITU-T Recommendation V.6. 8,
V. 21, V.I. 27 ter, V.I. 29, V.I. 17, V.I.
Which performs modulation and demodulation based on 34,
Each transmission mode is designated by the signal line 20c. The modulator / demodulator 8 inputs the signal output to the signal line 20b, outputs the modulated data to the signal line 8a, inputs the received signal output to the signal line 6a, and inputs the demodulated data to the signal line 8b. Output.

The ANSam transmission 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 signal is transmitted to the signal line 10a and is transmitted 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 adder circuit 12 inputs the information of the signal line 8a and the information of the signal line 10a, and adds the result of addition.
It is output to a. The reading circuit 14 reads an image of a document and outputs the read image data to the signal line 14a. The recording circuit 16 sequentially records the information output to the signal line 20e line by line.

The memory circuit 18 is used for storing raw information of read data or coded information, and for storing received information, decoded information or the like.

The control circuit 20 complies with ITU-T Recommendation V.50. 8,
V. The control unit 34 controls the facsimile communication operation by 34. Particularly, in the first to third embodiments of the present invention, the function of transmitting the primary channel information subsequent to the resync signal and the function of transmitting the primary channel information subsequent to the training signal are selected based on predetermined conditions. Then
Control is performed to determine whether to transmit the primary channel information after the resync signal or the training signal. In addition, normally, a process of transmitting the primary channel information after the resync signal is performed, and the primary channel information is transmitted subsequent to the training signal only when a predetermined condition is satisfied. Then, in the first embodiment of the present invention, the condition that the PPR signal is received a predetermined number of times consecutively (for example, 3 times) is adopted as the predetermined condition.

2 to 5 are flow charts showing the control flow of the control circuit 20 in the first embodiment.

First, the operation is started in S0, and in S2, a signal of signal level "0" is output to the signal line 20a to output CML.
Turn off. In S4, the signal of the signal level "0" is output to the signal line 20d and the ANSam signal is not transmitted.

In S6 and S8, it is judged whether outgoing call and incoming call are selected in order, and when outgoing call is selected, S1 is selected.
If the incoming call is selected, the process proceeds to step S48. If neither is selected, the process proceeds to step S10, performs other processing, and proceeds to step S2.

In S12, a signal of signal level "1" is output to the signal line 20a to turn on the CML.

In S14, the ANSam signal is received, and in S16
CM signal transmission, S18 JM signal reception, S2
At 0, the CJ signal is transmitted, at S22, the line probing signal is transmitted, and at S24, the S, S _* , PP, and TRN signals are sequentially transmitted.

Then, in S26, the flag PPRCT indicating how many times the PPR signal is continuously received is cleared.

In S28, parameters are exchanged, and S30 is performed.
Then, S, S _* , PP, B1 and primary channel information are transmitted. That is, the primary channel information is transmitted following the resync. Then, in S32, the V. 34 Sends and receives control channels.

In S34, it is determined whether or not the PPR signal is received. If it is received, the process proceeds to S40 and the counter PP
The value of RCT is incremented by 1, and the process proceeds to S42. If not received, the process proceeds to S36 and the counter PPRC
The value of T is cleared and the process proceeds to S38. In S38, it is determined whether or not the next page is transmitted. If the next page is transmitted, the process proceeds to S30, and if the next page is not transmitted, the process proceeds to S2.

In S42, it is determined whether or not the counter PRRCT is 3 or more, and if it is 3 or more, the process proceeds to S44.
If it is less than 3, the process proceeds to S30.

In S44, S, S _* , PP, TRN, and primary channel information are transmitted. That is, the primary channel information is transmitted after the training signal. Next, in S46, the counter PPRCT
Clear the value of and proceed to S32 .

In S48, a signal of signal level "1" is output to the signal line 20a to turn on the CML. S50
, ANSam signal transmission, S52 CM signal reception, S54 JM signal transmission, S56 CJ signal reception, S58 line probing signal reception, S6
At 0, the S, S _* , PP, and TRN signals are received, and at S62, parameter exchange is sequentially performed.

Then, in S64, it is judged whether or not S, S _* , PP and B1 are detected prior to the reception of the primary channel. When S, S _* , PP and B1 are detected, S66 is detected.
After resync, the primary channel information is received and the process proceeds to S70. When the S, S _* , PP, and TRN signals are detected, the process proceeds to S68, the primary channel information is received after the training signal is received, and the process proceeds to S70.

At S70, the V. 34 control channels are transmitted and received, and in S72, it is determined whether or not the next page is received, including retransmission, and if the next page is received, the process proceeds to S64, and if the next page is not received, the process proceeds to S2.

As described above, the primary channel information is transmitted after the training signal, and the reliability of the transmission of the primary channel information can be improved.

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

In the second embodiment, as the above-mentioned predetermined condition, the case where the PPR signal indicating that the reception of the previously transmitted primary channel information is all in error is received a predetermined number of times (for example, 3 times) is adopted. It was done. The overall operation is similar to that of the first embodiment described above.

The PPRCT in the second embodiment is also used.
Is used as a counter for counting whether or not the PPR signal indicating that all the frames transmitted this time are in error is received three consecutive times.

FIG. 6 is a flow chart showing a part of the operation of the control circuit 20 in the second embodiment which is different from that in the first embodiment (FIGS. 2 to 5).

In FIG. 6, S80 represents YES in S34. Then, in S82, the contents of the received PPR signal are determined to determine whether or not all the frames transmitted this time are in error.
If there is no error in (S40), the process proceeds to S86, the counter PPRCT is set to 0, and S88 (S30).
Proceed to.

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

In the third embodiment, as the above-mentioned predetermined condition, it is assumed that the control channel signal starting from the PPh signal is continuously received a predetermined number of times (for example, three times).

FIG. 7 is a flow chart showing a part of the operation of the control circuit 20 in the third embodiment which is different from that in the first embodiment (FIGS. 2 to 5).

In FIG. 7, S90 represents S24. Then, in S92, the counter PPhCT that counts the number of times the PPh signal is continuously received from the receiver as the control channel signal is cleared. Then, in S94, the process proceeds to S28.

Further, S96 represents S30. Then, in S98, the V. 34 control channels are transmitted and received. Here, the transmitter transmits a control channel signal starting from the Sh signal.

In S100, it is judged from the receiver whether or not the control channel starts from the PPh signal, and S
If the control channel signal starts with the h signal, then S
In step 102, the counter PPhCT is cleared and S1
At 04, the process proceeds to S38.

If the control channel signal starts from the PPh signal, the process proceeds to S106, where the counter PPh
The value of CT is incremented by 1. Then, S108
Then, it is determined whether or not the value of the counter PPhCT is 3 or more, and if it is 3 or more, the process proceeds to S110, and the S, S _* , PP, TRN, and primary channel information are transmitted by the same control as S44. After that, the process proceeds to S112, the counter PPh is cleared, and the process proceeds to S98. If the number is less than 3 in S108, the process proceeds to S38 in S104.

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

In the fourth embodiment, as the above-mentioned predetermined condition, either the transmission of the control channel signal starting from the PPh signal or the reception of the control channel signal starting from the PPh signal is continuously performed a predetermined number of times ( The case where it occurs 3 times is adopted.

In this embodiment, the counter PPhCT is
It is used to count the continuous occurrence of either the control channel signal starting from the PPh signal or the control channel signal starting from the PPh signal being received.

FIG. 8 shows the operation of the control circuit 20 according to the fourth embodiment, which is the first and third embodiments (FIGS. 2 to 5).
8 is a flowchart showing a part different from FIG. 7).

In FIG. 8, S120 represents S92. Then, in S122, the flag PPRFLG indicating that the PPR signal was received one time before is cleared. After that, in S124, the process proceeds to S28.

Further, S126 represents S30.
Then, in S128, it is determined whether or not the flag PPRFLG is 0, and if it is 0, the process proceeds to S136, and if it is 1, the process proceeds to S130.

In S130, the V. 34 control channels are transmitted and received. Here, the control channel signal starting from PPh is transmitted. And S1
In 32, the flag PPRFLG is cleared, and in S134, the process proceeds to S106.

Further, in S136, similarly to S98,
V. 34 control channels are transmitted and received. Here, the transmitter transmits a control channel signal starting from the Sh signal.

Then, in S138, it is determined whether or not the PPR signal is received, and if the PPR signal is received, S140 is executed.
Go to step S10 and set the flag PPRFLG to 1
When 0, the process proceeds to S142. If the PPR signal has not been received, the process proceeds to S144, the flag PPRFLG is cleared, and the process proceeds to S142 in S100.

As described above, it is possible to improve the reliability of the transmission of the primary channel information by transmitting the primary channel information after the training signal under various conditions.

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

Conventionally, in a facsimile apparatus which performs communication based on the ITU-T recommendation, when an ECM communication is executed, if an RCP signal is received while an image signal is being received, the control signal is received. Was there.

However, in such a procedure,
When the image signal was diverged when it was received, the RCP signal could not be detected and the control signal could not be received. Therefore, the transmitter side shifts to the transmission of the control signal, and at that time, the receiver continues to receive the image signal, resulting in disconnection of communication.

Therefore, in the fifth embodiment, ITU-T Recommendation V.10 is adopted. 21, V27ter, V.I. 29, V.I. Also in the communication of ITU-T Recommendation V.17. In both cases of V8 communication and V34 communication, divergence occurs when the image signal is received and RCP
(EN) Provided is a facsimile device capable of reliably shifting to control signal reception when a signal cannot be received and capable of continuing communication.

FIG. 9 is a block diagram showing the structure of a facsimile apparatus according to the fifth embodiment of the present invention.

The facsimile apparatus according to the fifth embodiment has the following construction in addition to the construction shown in FIG.

The signal presence / absence detection circuit 22 is a circuit for detecting the presence / absence of a signal input from the line. When the information of the signal line 6a is inputted and a signal of -43 dBm or more is present, the signal line 2 is detected.
The signal of the signal level "1" is output to 2a, and -48 dBm
For the following signals, the signal level "0" is output to the signal line 22a.
The signal of is output.

The filter 24 is from 600 Hz to 1800
It is a filter that passes the band of Hz, inputs the information of the signal line 6a, passes the signal of 600 Hz to 1800 Hz, and outputs the signal to the signal line 24a.

The filter 26 is from 1800 Hz to 300.
It is a filter that passes the band of 0Hz and is 1800H.
A signal of 3000 Hz is passed from z and the signal is output to the signal line 26a.

The signal presence / absence detection circuit 28 is a circuit for detecting the presence / absence of an output signal from the filter 24.
If the information of a is input and there is a signal of -48 dBm or more, a signal of signal level "1" is output to the signal line 28a,
If the signal is −53 dBm or less, the signal of the signal level “0” is output to the signal line 28a.

The signal presence / absence detection circuit 30 is a circuit for detecting the presence / absence of an output signal from the filter 26.
If the information of a is input and there is a signal of -48 dBm or more, a signal of signal level "1" is output to the signal line 30a,
If the signal is −53 dBm or less, the signal level “0” is output to the signal line 30a.

Further, in the fifth embodiment, the control circuit 20 carries out the following control. That is, the control circuit 20 sets the transition condition to the reception of the control signal at the time of receiving the image signal as ITU-T Recommendation V.5. 21, V.I.
27 ter, V.I. 29, V.I. 17 communications and ITU-T Recommendation V.17. 8, V.I. The control is changed depending on the communication of 34.

Specifically, the ITU-T Recommendation V.38 is used. 21,
V. 27 ter, V.I. 29, V.I. During the 17 communications, the transition from the reception of the image signal to the reception of the control signal is executed by detecting the RCP signal or detecting no signal energy for a predetermined time (for example, 1 second) or more. In addition, ITU-T Recommendation V. 8, V.I. During the communication of 34, the transition from the reception of the image signal to the reception of the control signal is performed by detecting the RCP signal or
Detection of changes in energy spectrum (eg 600H
Energy from z to 1800 Hz, 1800 Hz to 30
The determination is made by detecting the energy of 00 Hz).

During reception of the primary channel, 6
There is energy from 00 Hz to 1800 Hz and energy from 1800 Hz to 3000 Hz, but during the reception of the control channel, the signal from the calling side to the called side is 6
It is assumed that only energy of 00 Hz to 1800 Hz exists.

Since the other construction is the same as that of FIG. 1 described above, the same reference numerals are given and the individual description is omitted.

10 to 14 are flow charts showing the control flow of the control circuit 20 in the fifth embodiment.

First, the operation is started in S200 and then S202.
Then, the signal of the signal level "0" is output to the signal line 20a to turn off the CML. In S204, the signal line 20
The signal of the signal level “0” is output to d and the ANSam signal is not transmitted.

In S206, it is determined whether or not the reception is selected. When the reception is selected, the process proceeds to S209, and when the reception is not selected, the process proceeds to S208, other processes are performed, and the process proceeds to S202.

In S209, a signal of signal level "1" is output to the signal line 20a to turn on the CML. In S210, a pre-procedure is performed. Here, V. 8, V.I. 21, V.I. 34
Corresponding to the procedure, ECM communication shall be executed.

At S212, the other device is V. 8, V.I. 34
It is determined whether or not the communication function is provided, and V. 8, V.I. Three
4 has a communication function, the process proceeds to S238 and the V. 21,
V. 17, V.I. 29, V.I. If it has only the 27ter communication function, the process proceeds to S214.

Note that the reception that proceeds to S214 includes automatic reception and polling reception, and one of the features of this example is that these two operations are controlled in the same manner. That is, V. 8, V.I. In the H.34 communication, it is necessary to divide control by these two operations. 21, V.I. 1
7, V.I. 29, V.I. Since the same control can be performed in the 27ter communication, the same control is performed here.

In S214, the timer 1 is set to a time shorter than 3 seconds which is the PPS-Q signal retransmission interval, for example, 1 second. Even if it diverges while receiving high-speed data, this 1
By finding a continuous signal loss for a second, the PPS-Q signal transmitted the second time can be reliably received.

Next, in S216, at the current transmission rate, 1
A time obtained by adding a predetermined time α (for example, 20 seconds) to the time required to transmit the block data is set in the timer 2. The timer 2 is a timer for avoiding an illegal operation for getting out of receiving a high speed signal.

Next, in S218, an image signal is received,
In S220, it is determined whether the RCP signal is detected,
When the RCP signal is detected, the process proceeds to S222, and when the RCP signal is not detected, the process proceeds to S228.

In S222, the V. 21 is performed, and in S224, it is determined whether or not there is a next page, and if there is a next page, the process proceeds to S214, and if there is no next page, S2.
26 and proceed to V.26. The post-procedure 21 is executed, and the process proceeds to S202.

In S228, the presence / absence of a signal in the entire band output to the signal line 22a is checked, and if there is a signal, the process proceeds to S236, 1 second is set in the timer 1 and S2 is set.
Proceed to 32. If there is no signal, the process proceeds to S230, where it is determined whether or not the timer 1 has timed out. Proceed to S232.

In S232, it is determined whether or not the timer 2 has timed out. When the timer 2 has timed out, the process proceeds to S234, the error process is performed, and the process proceeds to S202. If the time has not expired, the process proceeds to S218.

In S238, it is determined whether or not the automatic reception is performed, and if the automatic reception is performed, the process proceeds to S240 (for receiving the V.34 control channel signal in this case,
If it is polling reception from 600 Hz to 1800 Hz, the process proceeds to S266 (in this case, V.34 control channel signal reception is 1800 H).
It becomes a signal of 3000 Hz from z).

At S240, the timer 1 is set to 300 ms. In S242, at the time required to transmit one block of data to the timer 2 at the current transmission rate,
A time added with a predetermined time α (for example, 10 seconds) is set. Then, in S244, the image signal is received.

Next, in S246, it is determined whether or not RCP is detected, and if an RCP signal is not detected, S254.
Proceed to. When the RCP signal is detected, the process proceeds to S248, and the V. The intermediate procedure of 34 is executed, and in S250, it is determined whether or not there is a next page.
If there is no next page, proceed to S252, where V. After executing the post-procedure 34, the process proceeds to S202.

Further, in S254, the information of the signal line 28a is inputted, and it is judged whether or not there is a signal in the band of 600 Hz to 1800 Hz. If there is, the flow proceeds to S256, and if there is not, S2.
Proceed to 64.

In S256, the information of the signal line 30a is input and it is judged whether or not there is a signal in the band of 1800 Hz to 3000 Hz. If it is judged that there is a high possibility that the control signal has been transferred, the process proceeds to S258 and the timer 1 Without setting 300 ms to, the time is judged. If not, the process proceeds to S264, timer 300 is set to 300 ms,
Proceed to S260.

In S258, it is determined whether or not the timer 1 has timed out. When the timer 1 has timed out, it is determined that the control signal has been entered, and the process proceeds to S248 (in this case, AC is transmitted to perform the retrain operation), and the time is over. If not, the process proceeds to S260.

In S260, it is determined whether or not the timer 2 has timed out. When the timer 2 has timed out, the process proceeds to S262, the error process is performed, and the process proceeds to S202. If the time has not expired, the process proceeds to S244.

Further, from S266 to S286, S240
From S264 to S264, the determinations of S254 and S256 are reversed to S276 and S278.

That is, since the polling reception is performed, the transmission is performed from the called side to the calling side. Therefore, the band at the time of receiving the control signal following the image information at the time of polling reception is 600
Hz to 1800 Hz, not 1800 Hz to 300
This is because it becomes 0 Hz.

Then, in S266, S240 and S242.
Represents the same processing as, and S268 represents the same processing as S244.

Further, in S270, the same judgment as in S246 is performed, and when RCP is detected, S272 (S24
Go to 8), and if not detected, proceed to S276.

In S274, the same determination as in S250 is performed. If there is a next page, the process proceeds to S266, and if not, the process proceeds to S252.

In S276, the information of the signal line 28a is input, and it is determined whether or not there is a signal in the band of 600 Hz to 1800 Hz. If not, the process proceeds to S278, and if there is, the process proceeds to S286. In S278, the information of the signal line 30a is input, and it is determined whether or not there is a signal in the band of 1800 Hz to 3000 Hz. If there is, the process proceeds to S280, and if not, the process proceeds to S286, timer 300 is set to 300 ms, and the process proceeds to S282. move on.

In S280, the same processing as in S258 is performed. If the timer 1 is over, the process proceeds to S272, and if the timer 1 is not over, the process proceeds to S282.

Further, in S282, the same processing as in S260 is performed, and if the timer 2 is over, S284 (S284
262) and if the timer 2 has not timed out, the process proceeds to S268.

As described above, the ITU-T Recommendation V.10 is used. Two
1, V27ter, V.I. 29, V.I. 17 communications and IT
UT Recommendation V.5. By changing the control depending on the communication of V.8 and V34, in either case, if the RCP signal cannot be received due to divergence at the time of receiving the image signal, the control signal can be surely transferred to continue the communication. The present invention provides a possible facsimile machine.

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

The conventional ITU-T Recommendation V.26. 21, V27t
er, V.E. 29, V.I. Facsimile devices with 17 communication functions are effective when receiving high-speed image signals.
It was set to turn on training disable for the modem when receiving a frame. Where RCP
When a signal is detected, or a signal interruption for a predetermined time (for example, 1 second) is detected, V. The procedure was shifted to the reception of the procedure signal 21.

However, ITU-T Recommendation V.3 8,
V. The facsimile machine having the communication function of V.34 has the above-mentioned V.34. 21, V27ter, V.I. 29, V.I. When the control of the facsimile device having the 17 communication function is applied, during a momentary interruption of, for example, 30 ms or more during reception of the primary channel,
Although there is an advantage that the reception of the primary channel can be continued without shifting to the reception of the control channel, RC
If an error occurs during reception of the P signal, the control channel cannot be received and communication is interrupted.

Here, if the training disable is not turned on to the modem after the reception of the primary channel information is started, the control channel is received in a momentary interruption of 30 ms, and the primary channel information after that is received. Although there is a drawback that it cannot be received, the information on the control channel can be surely received and communication can be continued. The reason for shifting to the reception of the control channel after a momentary interruption of 30 ms is that the silent time between the primary channel and the control channel is 70 ms ± 5 ms, so it is designed to shift in half of this time. Is.

Therefore, the sixth embodiment of the present invention is, for example, IT.
UT Recommendation V.5. 8, V.I. The present invention provides a facsimile device having a 34 communication function, which can cope with an error during reception of a primary channel according to a situation of occurrence of a momentary interruption, and can improve reliability of a shift operation to a control channel.

FIG. 15 is a block diagram showing the structure of a facsimile apparatus according to the sixth embodiment of the present invention.

The facsimile apparatus according to the sixth embodiment has a signal presence / absence detection circuit 22 in addition to the configuration shown in FIG. The signal presence / absence detection circuit 22 is a circuit for detecting the presence / absence of a signal input from the line similarly to the one described in the fifth embodiment, and inputs the information of the signal line 6a to detect a signal of -43 dBm or more. If there is, a signal having a signal level of "1" is output to the signal line 22a, and if it is a signal of -48 dBm or less, a signal having a signal level of "0" is output to the signal line 22a.

Further, the control circuit 20 of the sixth embodiment is
In particular, the following operation is performed. That is, the control circuit 20
Will start receiving the primary channel information, and will set the training disable to ON for the modem when it receives a valid 1 frame. If it detects the RCP signal or a signal other than the primary channel information, it will send to the modem. When the training disable is set to OFF and the RCP signal is detected or a signal other than the primary channel information is detected, the modem is controlled to be set to turn OFF the training disable.

At the same time, the instantaneous interruption during the reception of the primary channel information is checked. Then, according to the amount of momentary interruption during the reception of the primary channel information, the reception of the primary channel information is started, and the training disable is turned on to the modem when one valid frame is received. Control to change the timing to turn off the training disable to the. Specifically, as the amount of instantaneous interruption during the reception of the primary channel information is larger, the setting for turning off the training disable for the modem after the start of the reception of the primary channel information is delayed.

Since the other construction is the same as that of FIG. 1 described above, the same reference numerals are given and the individual description is omitted.

16 to 20 are flow charts showing the control flow of the control circuit 20 in the sixth embodiment.

First, the operation is started in S300 and then S302.
Then, the signal of the signal level "0" of the signal line 20a is output to turn off the CML. In S304, the signal of the signal level "0" is output to the signal line 20d, and the ANSam signal is not transmitted.

In S306, it is determined whether or not the incoming call is selected. When the incoming call is selected, the process proceeds to S10, and when the incoming call is not selected, the process proceeds to S308, and other processing is performed to S.
Proceed to 302.

In S310, the signal of signal level "1" is output to the signal line 20a to turn on the CML. S312 transmits an ANSam signal, S314 receives a CM signal, S316 transmits a JM signal, S318 receives a CJ signal, S320 receives a line probing signal, S322 receives a long training signal, S3.
At 24, parameter exchange is sequentially performed.

Next, in S326, when the training disable is turned off, it is set in the modem (modulator / demodulator 8).

In S328, even if the reception of the primary channel fails, the time at which the control channel reception can be started is set in Timer. That is, this time is a little longer than the transmission time of one partial page calculated from the selected transmission rate, and specifically, 2
0 seconds × (33.6 Kb / s) ÷ (transmission rate) is Time
Set to r.

Next, in S330, primary channel information is received. Then, in S332, the signal line 22
By inputting the information of a, it is judged whether or not a continuous interruption for 30 ms or more is detected, and if a continuous interruption for 30 ms or more is detected, the process proceeds to S338, and a continuous interruption for 30 ms or more is not detected. Then, the process proceeds to S334.

In S334, it is determined whether or not one frame with CRC has been received, that is, whether or not valid 1-frame data has been received. When a valid 1-frame is received, the process proceeds to S346 and the valid 1-frame is received. If no frame has been received, the process proceeds to S336. In S336, Time
It is determined whether r has timed out, and if timed out, the process proceeds to S302, and if not, the process proceeds to S330.

In S338, it is determined whether or not the control channel information is received. If the control channel information is received, the process proceeds to S342, and if the control channel information is not received, the process proceeds to S340. In S340, it is determined whether Timer has timed out,
When the time is over, the process proceeds to S302, and when it is not over, the process proceeds to S338.

S342 is a V. 34 shows a procedure with 34 control channels. Here, a PPR signal indicating that all frames are in error is transmitted.

In S344, it is judged whether or not the continuation of the communication is designated, and the continuation of the communication is designated (for example, the transmission of the errored frame information or the transmission of the CTR signal after receiving the CTC signal). When the continuation of communication is not designated (for example, the ERR signal is transmitted after receiving the EOR-Q signal), the process proceeds to S302.

In S346, the training disable is set to ON and the modem is set. In S348, the training disable is set to OFF and the modem is set to receive the control channel information while receiving the primary channel information. Set to Timer0.
Specifically, 5 seconds × (33.6 Kb / s) ÷ (transmission rate) is set.

In S350, the counter for counting the number of instantaneous interruptions of 30 ms is cleared. In S352, a timer Timer for obtaining the number of occurrences of instantaneous interruption per minute
Set 0 to 1. This timer is an up counter that counts the elapsed time.

Next, in S354, Timer2 is set to 30 m.
Set s. Further, in S356, a flag Timflg indicating that Timer0 has timed out and training disable is set to off in the modem.
Set 0 to.

In S358, the primary channel information is received, in S360, the information on the signal line 22a is input, it is determined whether or not there is a signal, and if there is a signal, S362.
Proceed to, set Timer2 to 30 ms and set S364.
If there is no signal, go to S376.

At S364, a decision is made from the demodulated data and R
Whether or not the CP signal is detected is determined, and if the RCP signal is detected, the process proceeds to S384, and if the RCP signal is not detected, the process proceeds to S366.

In S366, it is judged whether or not a signal other than the primary channel information is detected, and if it is detected, S38.
If 0 is detected, the process proceeds to S368. This is determined by the status information from the modem. Specifically, when TDIS (Training Disable) is on, even if there is a 30 ms or longer interruption, NO (S368).
To continue receiving the primary channel information,
3 when IS (Training Disable) is off
With a momentary interruption of 0 ms or more, the process proceeds to YES (S380) and shifts to receiving control channel information. Also, TDI
When the modem detects the control channel information regardless of the on / off state of S (training disable), the process proceeds to YES.

In S368, it is determined whether or not Timer0 has timed out.
If the time has not expired, the process proceeds to S358.

In S370, it is determined whether the flag Timflg is 0 or not. If it is 1, the process proceeds to S358. If it is 0, the process proceeds to S372, the flag Timflg is set to 1, and in S374, the training disable is set to OFF and the modem. After this, proceed to 358.

In S376, it is determined whether or not Timer2 has timed out.
8, the counter value is incremented by 1, and if the time is not over, the process proceeds to S364.

In S380, the value of the counter is divided by 60 ÷ (T
The number of instantaneous interruptions per minute during the reception of the primary channel information is calculated by multiplying by imager1 (second), and this value is stored as the number of instantaneous interruptions.

Next, in step S382, a timer Timer0SAV for turning off the training disable after the start of receiving the primary channel information is set to (temporary interruption number + 3) × (3
Set 3.6 Kb / s) / (transmission rate) (seconds).
Then, the process proceeds to S387-1.

On the other hand, in S384, the same processing as in S380 is performed, and in S386, the timer Timer0SAV for turning off the training disable after the start of the primary channel information reception is set to the (temporary interruption Number + 2) x (33.6Kb
/ S) ÷ (transmission rate) (seconds). And S
Proceed to 387-1.

In S387-1, it is determined whether or not Timflg is 0, and if it is 0, the process proceeds to S387-2, the training disable is set to OFF and the modem is set to S.
If it is 1, the process proceeds directly to S388.

In S388, the V. The control channel procedure of S34 is performed, and in S390, it is determined whether or not the primary channel information of the next page is received. If there is, the process proceeds to S392, and if not, the process proceeds to S302.

S392 is the above-mentioned S326 and S328.
The same process as described above is performed.
The same process as 0 is performed.

That is, in S392, when the training disable is turned off, the modem (modulator / demodulator 8) is set, and for example, 20 seconds × (33.6 Kb / s) ÷ (transmission rate) is set in Timer. Also, in S394,
Receives primary channel information.

Next, S396, S398, S400, S
In 402, S404, S406, and S408, S3 is sequentially performed.
32, S334, S336, S338, S340, S3
42, the same processing as S344 is performed. Here, S398
If YES, the process proceeds to S410 and Timer0SA
The value of V is stored in Timer0. Also, in S400, Y
If ES is YES in S404 and NO in S408, S
Proceed to 302.

As described above, by changing the timing at which the training disable to the modem is set to OFF in accordance with the amount of the instantaneous interruption during the reception of the information on the primary channel, the reliability of the transition operation to the control channel can be ensured. Can be improved.

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

In the sixth embodiment, the timing for setting the training disable to the modem to be turned off is changed according to the amount of instantaneous interruption during the reception of the information of the primary channel, but in the seventh embodiment, , The training disable setting for the modem is changed according to the amount of information on the primary channel. That is, as the amount of information on the primary channel is larger, the setting for turning off the training disable for the modem after the reception of the primary channel information is delayed.

FIG. 21 is a flow chart showing a part of the operation of the control circuit 20 in the seventh embodiment of the present invention which is different from that in the sixth embodiment (FIGS. 16 to 20).

First, S420 represents NO in S387-1, and S122 represents S387-2. And
In S424, the V. The procedure according to 34 control channels is performed, and the number of frames transmitted this time is stored here.

Next, in S426, (number of frames transmitted this time) × 0.5 × ((256 + 7) × 8) ÷ (transmission rate) (seconds)) is set in Timer0SAV.
Thereafter, the process proceeds to S390 in S428.

As described above, the certainty of the operation of shifting to the control channel can be improved by changing the timing for setting the training disable to the modem to OFF according to the amount of information being received on the primary channel. .

Next, an eighth embodiment of the present invention will be described.

The eighth embodiment is a combination of the sixth embodiment and the seventh embodiment described above under the logical sum condition.
The timing for setting the training disable for the modem to OFF is changed according to the amount of instantaneous interruption during reception of information on the primary channel and the amount of information.

FIG. 22 is a flow chart showing a part of the operation of the control circuit 20 in the eighth embodiment of the present invention which is different from that in the sixth embodiment (FIGS. 16 to 20).

First, S430 represents NO in S387-1, and S432 represents S387-2. And
In S434, the V. Perform the procedure with 34 control channels. Here, the number of frames transmitted this time is stored.

Next, in S436, the value of Timer0SAV is set to {(the number of frames transmitted this time) × 0.25 ×
The value obtained by ((256 + 7) × 8) ÷ (transmission rate) (seconds))} is added and stored again in Timer0SAV.
Thereafter, the process proceeds to S390 in S438.

In this way, by changing the timing for setting the training disable to the modem to OFF according to the amount of instantaneous interruption during the reception of information on the primary channel and the amount of information, the transition operation to the control channel is changed. The certainty can be improved.

In the above embodiment, the ITU-T Recommendation V.10 is used. 8, V.I. Although the facsimile communication conforming to 34 has been described, the present invention can be applied to various communication devices based on a communication protocol having a function of the same system as such a recommendation.

In the above embodiments, the stand-alone type facsimile apparatus has been described as an example. However, the present invention is not limited to this. For example, a copy function, an electronic file function, and a data processing function are combined with a communication function. Of course, it can be applied to the data communication control in the integrated data processing system.

[0165]

[0166]

[0167]

[0168]

According to the first to fifth inventions of the present application, for example, ITU-T Recommendation V.3 is adopted. 21, V.I. 27 ter , V.I. Two
9, V.I. Also in the communication of ITU-T Recommendation V.17. 8, V.
Even in the communication of No. 34 , if the RCP signal cannot be received due to divergence at the time of receiving the image signal, the control signal can be surely shifted to, and the communication can be continued.

Further, according to the sixth to eleventh inventions of the present application, since reception of the primary channel does not end when there are many interruptions, priority is given to reception of the primary channel, and when there are few interruptions, Since there are few errors in receiving the primary channel, it becomes possible to give priority to receiving the control channel.

Further, when the amount of received information is large, the reception priority timing of the control channel is delayed, errors during reception of the primary channel are reduced, and the control channel can be surely received. On the other hand, when the amount of received information is small, the probability of occurrence of a momentary interruption during reception of the primary channel is small, and it is considered that there are few errors during reception of the primary channel. Therefore, highly reliable communication becomes possible in consideration of communication time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus according to first to fourth 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 second embodiment.

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

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

FIG. 9 is a block diagram showing the structure of a facsimile apparatus according to a fifth embodiment of the present invention.

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

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

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

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

FIG. 14 is a flowchart showing the operation of the fifth embodiment.

FIG. 15 is a block diagram showing a configuration of a facsimile apparatus according to sixth to eighth embodiments of the present invention.

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 sixth embodiment.

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

FIG. 20 is a flowchart showing the operation of the sixth embodiment.

FIG. 21 is a flow chart showing the operation of the seventh embodiment.

FIG. 22 is a flow chart showing the operation of the eighth embodiment.

[Explanation of symbols]

2 ... NCU, 4 ... phone, 6 ... hybrid circuit, 8 ... Modem, 10 ... ANSam sending circuit, 12 ... Adder circuit, 14 ... reading circuit, 16 ... Recording circuit, 18 ... Memory circuit, 20 ... Control circuit, 22, 28, 30 ... Signal presence / absence detection circuit, 24, 26 ... Filters.

Claims (11)

(57) [Claims] 1. A first communication function and a second communication function, which are included in the ITU-T recommendation, and when the image signal is received, the transition condition to the reception of the control signal is defined as the first communication function. A communication device characterized by being changed with a second communication function. 2. The ITU-T Recommendation V.2 according to claim 1 , wherein the first communication function is 21, V.I.
27 ter, V.I. 29, V.I. 17 is a communication function based on the ITU-T Recommendation V.17. 8,
V. 34 is a communication function based on 34. 3. The communication according to claim 2 , wherein during the communication by the first communication function, the transition from the reception of the image signal to the reception of the control signal is performed by detecting the RCP signal or detecting no signal energy for a predetermined time or more. In the communication by the second communication function, the transition from the reception of the image signal to the reception of the control signal is performed by detecting the RCP signal,
Alternatively, the communication device is characterized by performing a change in the energy spectrum. 4. The energy storage device according to claim 3 , wherein the predetermined time is 1 second, and the energy spectrum is energy of 600 Hz to 1800 Hz,
A communication device characterized by detecting and determining energy from 00 Hz to 3000 Hz. 5. When the image signal is received, the transition condition to the reception of the control signal is defined in ITU-T Recommendation V.3. 21, V.I. 27te
r, V. 29, V.I. 17 based on the first communication function, and I
TU-T Recommendation V.3 8, V.I. And a second communication function based on 34. 6. When the reception of primary channel information based on the ITU-T recommendation is started and one valid frame is received, the training disable setting for the modem is turned on, and the RCP signal is detected or the primary is disabled. A communication device characterized in that, when a signal other than channel information is detected, training disable to the modem is set to off, and at the same time, a momentary interruption during information reception of the primary channel is checked. 7. The method according to claim 6 , wherein the timing of setting the training disable to the modem is turned off is changed according to the amount of information of the primary channel and / or the amount of interruption during reception of the primary channel information. A communication device characterized by. 8. The communication device according to claim 6 , wherein the setting to turn off the training disable for the modem is delayed as the amount of information on the primary channel increases. 9. The method according to claim 6 , wherein the greater the amount of instantaneous interruption during reception of the primary channel information,
A communication device, wherein a setting for turning off the training disable for the modem is delayed. 10. The ITU-T Recommendation V.5 according to any one of claims 6 to 9 . 8, V.I. 34. A communication device, which is a facsimile device having a communication function. 11. When the reception of information on the primary channel based on the ITU-T recommendation is started and one valid frame is received, the training disable setting to the modem is turned on, and the detection of the RCP signal or the primary A communication method characterized by setting the training disable to the modem to be turned off when a signal other than channel information is detected, and at the same time checking for a momentary interruption while receiving information on the primary channel.