JP3362708B2 - Facsimile communication method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a facsimile apparatus and a facsimile communication method, especially V. The present invention relates to a facsimile communication method for performing communication in the 34 mode communication sequence.

[0002]

2. Description of the Related Art V.V. The 34 mode is a T.34 mode compliant with ITU-T. 30 procedures are performed. This T. In the communication procedure performed by the V.30 procedure, V.V. of the call connection and initial identification phase is used. 8 sequences,
Image data communication is performed through a line probing sequence that measures line characteristics and determines the symbol rate, an equalizer training sequence that optimizes the equalizer of the receiving modem, and a control channel sequence that determines the data rate and exchanges device parameters with each other. Perform the primary channel sequence. V. Three
In the 4-mode, image data is transmitted at a high-speed data rate of 33.6 kbps at the maximum, so that it is necessary to optimize the modem according to the characteristics of the line. Therefore, the long sequence as described above is performed.

FIG. 7 shows a conventional V.V. It is a communication sequence in the 34 mode. The upper part shows the communication sequence on the transmitting side, and the lower part shows the communication sequence on the receiving side. V. The sequence of the 34 mode will be briefly described. First, V.34 which is a phase of initial identification. There are 8 sequences. Here, the V. It is confirmed whether or not it has the 34 mode. V. 8 sequences. If it is determined that both have the 34 mode, the process proceeds to the next line probing sequence.

In line probing, the line characteristic is measured and the symbol rate is determined based on the result. The symbol rate is 3429, 3200, 3000, 280
There are 6 types of 0, 2743, and 2400 bps, and any one of them is selected. In the next equalizer training sequence, the symbol rate determined in the line probing sequence is used to train to optimize the equalizer for the primary channel. The control channel is roughly divided into 2
There are two functions. The first is before the E signal of the control channel, and determines the data rate used in the primary channel.

The data rate is determined by the result of line probing and the result of equalizer training.
The data rate ranges from 33600 bps to 2400 bps, and is in increments of 2400 bps. The process of determination is to send the set data rate information to the other party from both the facsimile machine on the sending side (hereinafter referred to as the transmitter) and the facsimile machine on the receiving side (hereinafter referred to as the receiver). The lower data rate is selected. Another function of the control channel is the T.V. There is an exchange of both terminal information called the 30 phase. here,
The well-known V. The same information exchange as in phase B performed in communication of 17, V29, V27ter or lower is performed. The control channel is exchanged with a signal of 1200 bps.

To terminate the control channel, all "1" information of 40 bits or more is transmitted from the transmitter side,
When the receiver can receive it, the receiver stops sending the flag. The transmitter side detects that the flag from the receiver side has stopped and stops the flag from the transmitter side.
This terminates the control channel. Next comes the primary channel sequence for communicating image signals.

The above-mentioned V. In order to reduce the total communication time in a facsimile machine using the V.34 mode, V.34. An example in which a part of 8 sequences is omitted is disclosed in Japanese Patent Laid-Open No. 9-186838
It is disclosed in the publication. According to this publication, V. Although some of the 8 sequences are omitted, the line probing sequence is performed every time communication is performed. Further, in the data communication device disclosed in Japanese Patent Laid-Open No. 10-136112, an example in which a line (line) probing sequence is omitted is disclosed.

[0008]

In the conventional facsimile apparatus described above, the total communication time is long even if the sequence of image data is performed at high speed because the sequence until the transmission of image data is long. It has become long, and it is difficult for users to see the effect of the speedup. Also, when communicating again with a party that has once communicated, it is known how much symbol rate and data rate communication is possible, so check the line status such as line probing. Although it is not necessary to perform the normal V. Three
In the 4 mode, the same sequence is performed every time communication is performed, which is a very waste of time.

That is, in the example of the former publication mentioned above,
V. Although a part of the 8 sequences is omitted, the line probing sequence, which is the line characteristic measurement, is performed every time and is useless. Further, in the example of the latter publication, since the line probing sequence is omitted, ANSam
Tone A, tone B, QIN after QTS hitting the signal
We are exchanging with FO signal. In this case, QINFO
Since the symbol rate information is included in the signal, the procedure becomes complicated, and there is a problem that the signal may be lost or some signals are exchanged, and the communication time becomes longer accordingly.

The object of the present invention is to 34 mode facsimile communication. Facsimile apparatus, facsimile communication method, and communication method capable of simplifying the communication procedure, stabilizing the communication, and further shortening the total communication time by omitting a part of the eight sequences, the line probing sequence, and the control channel sequence To provide.

[0011]

Facsimile communication method of the present invention of the present invention According to an aspect of the, V. In the facsimile communication method for performing communication in the 34-mode communication sequence, when the dial of the facsimile machine on the transmission side is a speed dial or one-touch dial and this communication is the second or subsequent communication to the same ground, the transmission side The corresponding symbol rate and data rate values set in the storage means in the previous communication are read from the storage means, set in the symbol rate determination means and the data rate determination means, respectively, and sent after the call is made and after the call is received from the receiving side. Done AN
When the Sam signal is detected, the tone signal generating means transmits a tone signal of a predetermined frequency to notify the symbol rate used in this communication, and at the receiving side, when the tone signal detecting means detects the tone signal. Immediately said AN
The sending of the Sam signal is stopped, the symbol rate based on the notified tone signal is set, and on the transmitting side, after the tone signal has been sent, the process proceeds to the transmission of the control channel. 21 It is determined whether or not the DIS signal of channel 2 arrives, and if the DIS signal is detected,
The transmission of the control channel is stopped, the DIS signal is received, and the V. In the 34-mode manual sequence, if the DIS signal is not detected, the control channel communication is continued, and the data rate value set in the data rate determining means is transmitted to determine the data rate, After the control channel is completed, the equalizer training is transmitted to optimize the equalizer on the receiving side, and the image signal is transmitted on the primary channel.

[0012]

[0013]

[0014]

[0015]

Also, the facsimile communication method of the present invention is
V. In the facsimile communication method for performing communication in the 34-mode communication sequence, when the dial of the facsimile machine on the transmission side is a speed dial or one-touch dial and this communication is the second or subsequent communication to the same ground, the transmission side The corresponding symbol rate and data rate values set in the storage means in the previous communication are read from the storage means, set in the symbol rate determination means and the data rate determination means, respectively, and after calling,
When the ANSam signal transmitted after receiving from the receiving side is detected, the tone signal generating means transmits a tone signal of a predetermined frequency to notify the symbol rate used in this communication, and the receiving side transmits the tone signal to the tone signal. When it is detected by the detecting means, the transmission of the ANSam signal is immediately stopped, the symbol rate based on the notified tone signal is set, and the transmitting side shifts to the transmission of the control channel after transmitting the tone signal and receives the signal. From the V. side. 21 It is determined whether or not the DIS signal of channel 2 arrives, and when the DIS signal is detected, the transmission of the control channel is stopped and the DIS signal is received, and V.V. Three
If the DIS signal is not detected after shifting to the 4-mode manual sequence, the E signal of the control channel is monitored, and when the E signal is completed, the signal for terminating the control channel is transmitted, and the receiving side After confirming the flag stop sent from, it is considered that the control channel is completed, and after the control channel is completed,
The configuration may be such that the equalizer training is transmitted, the equalizer on the receiving side is optimized, and the image signal is transmitted on the primary channel.

According to the present invention, V. In facsimile communication in which communication is performed in the 34-mode communication sequence, in communication with a partner who has once communicated with and is registered in the speed dial or the one-touch dial,
V. By performing communication while omitting part of the eight sequences and the line probing sequence, the total communication time can be shortened.

Specifically, V. 8 sequence ANSam
By hitting the tone signal at the timing of the signal, V.
The CM / JM / CJ portion of the 8 sequences is omitted. Further, since the line characteristic is already known, the previously applied symbol rate is known, and by using this last symbol rate, the line probing sequence is omitted. The previous symbol rate is notified from the transmitting side to the receiving side according to the type of tone signal that hits the ANSam signal, so that the transmitting side and the receiving side share information.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the facsimile apparatus according to the present invention has a V.V. It is used in a facsimile communication system for performing communication in the 34-mode communication sequence, and has a terminal control unit 10 for controlling a facsimile terminal and a network control unit 11 for interfacing with a line. The basic functions of the facsimile device such as image detection and printing are the same as those of a normal facsimile device, and therefore illustration and description thereof are omitted. In this example, only the transmitter side is shown, and the configuration of the receiver side is the same as that of the transmitter side, so illustration and description thereof are omitted.

The terminal control section 10 includes a modem 1 for modulating / demodulating a communication signal, an analog circuit 2 for adjusting a signal level when an analog signal modulated / demodulated by the modem 1 is transmitted to or received from a line, and a V. 8 sequence ANSam
When a signal is detected, a start signal generation circuit 3 that generates a predetermined tone signal for omitting the communication procedure, a tone signal detection circuit 4 that detects the predetermined tone signal and stops the ANSam signal, and which symbol at the time of transmission The communication is performed at a data rate with a symbol rate determination circuit 5 which determines which communication rate is to be used for communication and which symbol rate is used to determine communication at the time of reception based on the type of tone signal detected by the tone signal detection circuit 4. A data rate determination circuit 6 for determining whether to perform, a memory 7 that stores the symbol rate, the data rate and the device state at the time of the previous communication of the other party registered in the speed dial information or the one-touch dial information, and the entire communication. And a communication control unit 8 for controlling.

The operation will be described below with reference to FIGS. 1 to 4. FIG. 34 mode communication sequence, which is a feature of the present invention. CM in 8 sequences
It is a figure which shows a mode that the part / JM / CJ and a line probing sequence are omitted. FIG. 2B is a diagram showing an example of correspondence between the symbol rate and the tone frequency. In this figure, six types of symbol rates are illustrated.

FIG. 3 is an operation flow on the transmitter side in the first embodiment of the facsimile communication method of the present invention.
First, dialing is performed from the transmitter side, and the communication control unit 8 determines whether the dial is a speed dial or a one-touch dial (step 1: S1). If it is not a speed dial or a one-touch dial, the operation flow is exited. In the case of the speed dial or the one-touch dial, the communication control unit 8 determines whether or not the current communication is the second and subsequent communication to the same destination (S2). If the dial destination is the first communication, the symbol rate and the data rate information are not yet registered and do not exist, and the operation flow is ended.

The dial destination has previously communicated 2
If it is the communication after the first communication, the symbol rate and the data rate value set in the previous communication are set (S3). The symbol rate and data rate are stored in memory 7 during the previous communication.
The symbol rate determination circuit 5 and the data rate determination circuit 6 read the information stored in the memory and set it in each circuit. Next, a call is made (S4), and when the call is connected to the receiver after the call, ANSam is received from the receiver.
The signal is transmitted.

The transmitter detects and judges this ANSam signal by the modem 1 (S5). If this signal cannot be detected within the predetermined time period (S8), the operation flow is exited.
As soon as the ANSam signal is detected, the tone signal generation circuit 3 transmits the tone signal (S6). There are at least six types of tone signals, and the frequency notifies the symbol rate used in the subsequent communication. The relationship between the frequency of the tone signal and the symbol rate is shown in FIG. This tone signal causes the receiver to stop sending ANSam signals. That is, according to the present invention, a tone signal is transmitted from the transmitting side that has detected the ANSam signal, and the receiving side stops the ANSam signal at the time of detecting this tone signal, so that CM / JM /
Transmission and reception of the CJ signal can be omitted.

After transmitting the tone, the transmitter shifts to transmission of the control channel (S7). For sending the control channel from the transmitter, 21 channels (ch) 2
When the DIS signal of S1 is received (S9), the transmitter stops the transmission of the control channel (S11) and receives the DIS signal (S12). The presence / absence of 8 sequence capability is determined (S13). When the DIS signal is received, it is determined that the receiver does not have the function of the present invention, and the normal V.V. The operation proceeds to the 34-mode manual sequence (S14,
S15). However, V. If there is no 8 ability, V. 34, that is, V.34. 17, V.I. 29, V.I. 27t
er sequence (S16, S17). V.
When the 21ch2 DIS signal does not come, the control channel communication is continued.

In the control channel communication, the data rate value set in the data rate determining circuit 6 is sent to determine the data rate. When the control channel is completed (S10), the equalizer training (S18) is then sent to optimize the equalizer of the receiver. Then, the image signal is transmitted on the primary channel (S19).

Next, the operation flow on the receiver side will be described with reference to FIG. On the receiver side, an incoming call (S
21) occurs. Then, the ANSam signal is transmitted (S22). When it is determined that the tone signal is received during the transmission of the ANSam signal (S23), the transmission of the ANSam signal is immediately stopped (S24). The tone signal detection circuit 4 detects the tone signal. Next, the symbol rate is determined from the frequency of the tone signal and the symbol rate value is set (S25). The determination and setting are performed by the symbol rate determination circuit 5. After that, the control channel is started (S26), and the data rate is determined by the control channel. Then, the control channel is completed (S27). Next, equalizer training is performed (S28), the equalizer is optimized, and then the image signal is received in the primary channel reception (S29).

When the tone signal is not detected and the CM signal is detected, a normal V.V. 34 mode is executed (S30,
S31). If both the tone and the CM signal are not detected and time out occurs, the V. 21ch2 DI
The S signal is transmitted (S32, S33).

Next, a second embodiment of the facsimile communication method of the present invention will be described with reference to FIGS. In FIG. 5, steps 9 and 10 in FIG. 3 are replaced.

After starting the control channel, V. 21c
It is determined whether or not the DIS signal of h2 is detected (S41). If the DIS signal is detected, go to step 11 of FIG. 3, and if the DIS signal is not detected, the E of the control channel is detected. The signal is monitored (S4
2).

When the E signal is completed, a signal for terminating the control channel, that is, 40 consecutive "1" bits are transmitted (S43), and the flag stop from the receiver is waited (S44). If the flag is not disconnected in S44, the control channel cannot be omitted.
Control channel and T.P. 30 phases are performed (S46 to S48). The omitted part is the T.S.
Since it is 30 phases, if it cannot be omitted, it will be executed.

If the flag stop is confirmed, the control channel is completed (S45), and step 18 in FIG.
Return to. According to the second embodiment, in addition to the first embodiment, the T. It is possible to omit 30 phases. On the receiver side, as shown in FIG. Although it is possible to omit 30 phases, detailed description will be omitted (S26 to S58).

In the second embodiment, the control channel is omitted in addition to the omission of the line probing sequence. That is, in this embodiment, the other party is a V. It is made possible by storing the information that it has the 34 mode, but by also storing the terminal information of the other party, which is known at the time of the previous communication,
The control channel can also be omitted. This further shortens the communication time and reduces the full-duplex procedure as much as possible to improve the communication stability. That is, since the control channel is a full-duplex procedure of 1200 bps, the S / N is not so good from the viewpoint of S / N, but the S / N is inferior to the half-duplex. Therefore, by reducing this full duplex, communication will be stable and communication time will be further reduced.

[0035]

As described above, according to the present invention,
V. In facsimile communication that performs communication in the 34-mode communication sequence, in order to shorten the time of the entire communication, communication with a partner who has performed communication once and who is registered in the speed dial or one-touch dial is used. , V. By omitting part of the eight sequences, the line probing sequence, and the control channel sequence for communication, the total communication time can be shortened. Further, since the communication time is shortened, the communication cost can be reduced, and the time for one communication is shortened, so that the waiting time for transmission is shortened and the occurrence of re-calling is reduced.

[Brief description of drawings]

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

FIG. 2A is a diagram showing a shortened communication procedure executed in the present invention. (B) is a diagram showing an example of correspondence between tone frequencies and applied symbol rates.

FIG. 3 is a flowchart showing an operation on the transmitting side in the first embodiment of the facsimile communication method of the present invention.

FIG. 4 is a flowchart showing an operation on the receiving side in the first embodiment of the facsimile communication method of the present invention.

FIG. 5 is a flowchart showing a part of the operation on the transmission side in the second embodiment of the facsimile communication method of the present invention.

FIG. 6 is a flowchart showing a part of the operation on the receiving side in the second embodiment of the facsimile communication method of the present invention.

FIG. 7: T. Normal V.30 standard. It is a figure which shows the communication sequence of 34 mode.

[Explanation of symbols]

1 modem 2 analog circuits 3 Start signal generation circuit 4 tone signal detection circuit 5 Symbol rate determination circuit 6 Data rate determination circuit 7 memory 8 Communication control unit 10 terminal control unit 11 Network control unit

Claims (2)

(57) [Claims] 1. V. In the facsimile communication method for performing communication in the 34-mode communication sequence, when the dial of the facsimile machine on the transmission side is a speed dial or one-touch dial and this communication is the second or subsequent communication to the same ground, the transmission side The corresponding symbol rate and data rate values set in the storage means in the previous communication are read from the storage means, set in the symbol rate determination means and the data rate determination means, respectively, and sent after the call is made and after the call is received from the receiving side. Is done
When the m signal is detected, the tone signal generating means sends out a tone signal of a predetermined frequency to notify the symbol rate used in this communication. On the receiving side, when the tone signal detecting means detects the tone signal, Immediately said ANSa
The transmission of the m signal is stopped, the symbol rate based on the notified tone signal is set, and the transmitting side shifts to the transmission of the control channel after transmitting the tone signal. 21 It is determined whether or not the DIS signal of channel 2 arrives, and when the DIS signal is detected, the transmission of the control channel is stopped and the DIS signal is received, and V.V. In the 34-mode manual sequence, if the DIS signal is not detected, the control channel communication is continued, and the data rate value set in the data rate determining means is transmitted to determine the data rate, A facsimile communication method characterized by transmitting equalizer training, optimizing the equalizer on the receiving side after the control channel is completed, and transmitting an image signal on the primary channel. 2. In the facsimile communication method for performing communication in the 34-mode communication sequence, when the dial of the facsimile machine on the transmission side is a speed dial or one-touch dial and this communication is the second or subsequent communication to the same ground, the transmission side The corresponding symbol rate and data rate values set in the storage means in the previous communication are read from the storage means, set in the symbol rate determination means and the data rate determination means, respectively, and sent after the call is made and after the call is received from the receiving side. Is done
When the m signal is detected, the tone signal generating means sends out a tone signal of a predetermined frequency to notify the symbol rate used in this communication. On the receiving side, when the tone signal detecting means detects the tone signal, Immediately said ANSa
The transmission of the m signal is stopped, the symbol rate based on the notified tone signal is set, and the transmitting side shifts to the transmission of the control channel after transmitting the tone signal. 21 It is determined whether or not the DIS signal of channel 2 arrives, and when the DIS signal is detected, the transmission of the control channel is stopped and the DIS signal is received, and V.V. If the DIS signal is not detected in the 34-mode manual sequence, the E signal of the control channel is monitored, and when the E signal is completed, the signal for terminating the control channel is transmitted, and the receiving side When the stop of the flag sent from is confirmed, it is considered that the control channel is completed, after the control channel is completed, equalizer training is sent to optimize the equalizer on the receiving side, and the image signal is sent on the primary channel. Facsimile communication method.