JPH09116718A - Communication terminal equipment and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication terminal equipment and a communication control method in which normal communication is started only by one call connection. SOLUTION: When a JM signal is detected during transmission of a CM signal after dialing, a control section 3 controls a modem section 1 to attain transit to facsimile communication by a protocol of the ITU-T recommendations V.34. When a binary protocol signal based on the ITU-T recommendations T.30 during the transmission of the CM signal is detected, the control section 3 controls the modem section 1 depending on the presence of the modulation system by the ITU-T recommendations V.34 informed from a called terminal equipment to attain transition to the facsimile communication by the ITU-T recommendations T.30 or the ITU-T recommendations V.34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device and a communication control method, and more particularly to ITU-T Recommendation V.38. The present invention relates to a communication terminal device having a 34-compliant modem and a communication control method.

[0002]

2. Description of the Related Art Conventionally, ITU-T Recommendation V. A communication terminal device equipped with a modem compliant with the ITU-T Recommendation V.34 is applicable. Communication was to be started in the sequence specified in 8. First, an incoming signal is sent from the exchange side to the called terminal in response to dial transmission from the calling terminal, and the called terminal automatically responds in response to this, and sends an ANSam signal to the calling terminal. .

In response to the detection of the ANSam signal, the calling terminal starts transmitting a CM signal to the called terminal, and the called terminal transmits a JM signal in response to the detection of the CM signal. After this, ITU-T Recommendation V. 8 to ITU-T Recommendation V.8. Then, the procedure shifts to the procedure of 34, and the sending and receiving operations of the facsimile message are started at the calling and called terminals.

[0004]

Therefore, in such a conventional communication terminal device, the calling terminal is CM when the ANSam signal is detected from the called terminal due to the timing of the line connection or the line delay of the signal. When the signal transmission is started, the called terminal stops the ANSam signal and the ITU-
Recommendation T. If the procedure shifts to the binary procedure defined in No. 30, there is a problem that normal communication cannot be started.

That is, as shown in FIG. 3, in response to the detection of the ANSam signal 61 from the called terminal, the calling terminal sends C
When the transmission of the M signal 51 is started, the IT
U.T. Recommendation T. The DIS signal 62 will be transmitted based on the 30 binary procedure. In this case, the calling terminal sends the CM signal 51 until the JM signal from the called terminal is detected.
Is repeatedly transmitted, and the called terminal uses the DS from the calling terminal.
There is a problem that a loop occurs in which the DIS signal 62 is repeatedly transmitted until the C signal is detected, and normal communication cannot be started.

As a method for controlling the switching of the communication mode, there is a method of measuring the frequency of the procedure signal and controlling the switching of the mode based on the measurement result (for example, Japanese Patent Laid-Open No. 2-17764). Although proposed, there is a problem that expensive circuit components are required to measure the frequency with high accuracy. The present invention is intended to solve such a problem, and an object thereof is to provide a communication terminal device and a communication control method capable of starting normal communication with one call connection.

[0007]

In order to achieve such an object, a communication terminal device and a communication control method according to the present invention are provided in accordance with ITU-T Recommendation V.3 from a called terminal. J based on 8
M signal and ITU-T Recommendation T.38 from the called terminal. A modem unit for receiving a binary procedure signal based on ITU-T Recommendation V.30 from the called terminal after calling is provided. ANS by 8
If an am signal is detected, ITU-T Recommendation V.38. 8 is transmitted, and when the JM signal is detected by the modem section during the transmission of the CM signal, the ITU-T Recommendation V.8. Shift to the facsimile communication operation according to the procedure of 34,
The ITU-T Recommendation T.264 is used by the modem during transmission of the CM signal. 3
When a binary procedure signal based on 0 is detected, the ITU-T Recommendation V.5 sent from the called terminal is notified. ITU-T Recommendation T.34 depending on the presence / absence of the modulation method of T.34. 30 or ITU-
Recommendation V.T. The facsimile communication operation by 34 is performed.

Therefore, when the JM signal is detected by the modem section during the transmission of the CM signal, the ITU-T Recommendation V.38 is recommended.
Migrate to the facsimile communication operation according to the procedure of 34, and CM
The ITU-T Recommendation T.264 is used by the modem unit during signal transmission. When a binary procedure signal based on H.30 is detected, the ITU-T Recommendation V.30 is notified from the called terminal. ITU-T Recommendation T.34 depending on the presence / absence of the modulation method of T.34. 30 or ITU-T Recommendation V.30. The facsimile communication operation by 34 is started.

In addition, ITU-T Recommendation V. 21 high-pass channels V.21. A flag detection unit for detecting a flag pattern of the HDLC frame modulated by 21 (H) is provided, and the control unit starts the detection of the JM signal by the modem unit after the start of the CM signal transmission, and the detection output from the flag detection unit. According to the above, the detection of the binary procedure signal is started by the modem section. Therefore, after the transmission of the CM signal is started, the modem unit transmits the ITU-T recommendation V. The detection of the JM signal by 8 is started, and according to the detection output from the flag detection unit,
ITU-T Recommendation T.V. The detection of the binary procedure signal based on 30 is started.

[0010]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a communication terminal device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes all modulation / demodulation functions required for facsimile communication, and HDL.
A modem unit 2 having a framing / deframing function of C (high-level transmission control procedure) and a tone signal sending / detecting function, 2 is a predetermined flag pattern of the HDLC frame from the received output (bit data) of the modem unit 1, for example, " The flag detection unit 3 for detecting "01111110" is mainly composed of a microprocessor, and the control unit 4 for controlling data transmission / reception and the whole operation is a line interface unit for connecting to a public telephone line network.

Next, the operation of the present invention will be described with reference to FIG. FIG. 2 is a sequence diagram showing an operation at the start of communication. After sending the dial, the calling terminal receives the ITU-T recommendation T.264 from the modem section 1 through the line interface section 4 under the control of the control section 3. CNG signal 2 specified in 30
1 (calling tone signal) is transmitted for 0.5 seconds, and the signal from the called terminal is waited for reception during the transmission interval (3 seconds).

During this time, ITU-T Recommendation V. When the ANSam signal 31 specified in 8 is received by the modem unit 1, the control unit 3 causes the transmitter inside the modem unit 1 to operate in accordance with ITU-T Recommendation V.8. 21 of the low-frequency channel modulation method V.21. 21 (L) modulation method and the receiver inside the modem unit 1 is set to the ITU-T Recommendation V.21. 21 of the high-frequency channel modulation system of V.21. 21 (H) modulation method and ITU-T Recommendation V.21. 8 CM signal 22 (calling menu signal)
Is sent. As a result, the CM signal 22 is transmitted from the modem unit 1 to the called terminal via the line interface unit 4.

Further, the control unit 3 monitors the states of the modem unit 1 and the flag detection unit 2 during the transmission of the CM signal 22. Here, when the detection of the JM signal (not shown) which is the response signal to the CM signal 22 is notified from the modem unit 1, the ITU-T Recommendation V. IT from procedure 8
U.T. Recommendation V. A facsimile communication operation based on the procedure of 34 is performed.

On the other hand, when the detection of the flag pattern of the HDLC frame is notified from the flag detection unit 2, the HDLC deframing operation is set to the modem unit 1,
ITU-T Recommendation T. Start receiving 30 binary procedure signals. After this, the received output from the modem unit 1 is analyzed and the ITU-T recommendation T.264. DIS signal (digital identification signal) defined in 30 (NS which is an optional signal)
ITU-T by F signal (non-standard function signal) and CSI signal (callee terminal identification signal may be added)
Recommendation V. If it is notified that the modulation scheme of T.34 is “none”, the normal ITU-T recommendation T.34. The facsimile communication operation is continued in the binary procedure indicated by 30.

In addition, the ITU-T Recommendation V.3 is provided by the DIS signal 32 from the called terminal. When it is notified that the modulation system of 34 is “present”, the control unit 3 sets the receiver inside the modem unit 1 to ITU- so that the modem unit 1 can receive the JM signal.
Recommendation V.T. 21 of the high-frequency channel modulation system of V.21. 21
The modulation method of (H) is set, and the tonal detector in the modem unit 1 is set so that the ANSam signal can be detected.

After this, ITU-T Recommendation V. In order to transmit the CI signal defined by V.8, In this state, the control unit 3 controls the modem unit 1 to start transmitting the CI signal 23. Therefore, the JM signal 34 is transmitted from the called terminal in response to the CI signal 23, and the CJ signal 25 is transmitted from the calling terminal in response to the JM signal 34. Thereafter, ITU-T Recommendation V ． The procedure shifts to the facsimile communication operation according to the procedure of 34.

As described above, ITU-T Recommendation V.3 JM signal from the called terminal based on the
-T Recommendation T. The modem unit 1 for receiving the binary procedure signal from the called terminal based on 30 is provided, and when the JM signal is received during the transmission of the CM signal after the call, the ITU-T Recommendation V.30. According to the procedure of 34, shift to the facsimile communication operation,
ITU-T recommendation T.264 during transmission of CM signal. When a binary procedure signal based on H.30 is received, the ITU-T Recommendation V.30 notified by the called terminal is used. ITU-T Recommendation T.34 depending on the presence or absence of the modulation method of H.34. 30 or ITU-T Recommendation V.30.
The facsimile communication operation by 34 is performed.

Therefore, at the time when the calling terminal starts the CM signal, the called terminal is set to A due to the line connection timing, the signal detection timing, or the line delay of the signal.
The NSam signal is stopped and ITU-T Recommendation T.264. ITU-T Recommendation T.30 even if it has moved to the binary procedure of H.30. 30 procedure to ITU-T Recommendation V.30. 8 and returned to the original ITU-T Recommendation V.8. Facsimile communication by 34 can be started, and normal communication can be started by one call connection without falling into a loop of repeating signal resending by a different procedure in the calling and receiving terminals as in the past. It becomes possible to do.

In addition, from the reception output of the modem unit 1, ITU-
Recommendation V.T. 21 high-pass channels V.21. The flag detection unit 2 for detecting the flag pattern of the HDLC frame modulated at 21 (H) is provided, and after the start of the CM signal transmission, the modem unit 1
ITU-T Recommendation V. 8 starts detection of the JM signal, and in response to the detection output from the flag detection unit 2, the modem unit 1 causes the ITU-T recommendation T.8. Since the detection of the binary procedure signal based on ITU-T Recommendation V.30 is started in the modem unit 1. 8 at the same time as the detection of the JM signal by ITU-T Recommendation T.8. The presence or absence of 30 binary procedure signals can be detected, and more accurate and quick communication control can be performed.

[0020]

As described above, according to the present invention, the ITU-T Recommendation V.3 from the called terminal is used. 8 based on JM signals and ITU-T Recommendation T.38 from the called terminal. A modem unit for receiving a binary procedure signal based on ITU-T Recommendation V.30 from the called terminal after calling is provided. If an ANSam signal according to ITU-T No. 8 is detected, ITU-T Recommendation V.8. 8 CM signal is transmitted, and the JM is operated by the modem unit during the CM signal transmission.
If a signal is detected, ITU-T Recommendation V.5. 34, the mode shifts to the facsimile communication operation according to the procedure of ITU-T Recommendation T.34. When a binary procedure signal based on H.30 is detected, the ITU-T Recommendation V.30 is notified from the called terminal. ITU-T Recommendation T.34 depending on the presence / absence of the modulation method of T.34. 30 or ITU-T Recommendation V.30. 3
4 to the facsimile communication operation.

Therefore, at the time when the calling terminal starts the CM signal, the called terminal is set to A by the line connection timing, the signal detection timing, or the line delay of the signal.
The NSam signal is stopped and ITU-T Recommendation T.264. ITU-T Recommendation T.30 even if it has moved to the binary procedure of H.30. 30 procedure to ITU-T Recommendation V.30. 8 and returned to the original ITU-T Recommendation V.8. Facsimile communication by 34 can be started, and normal communication can be started by one call connection without falling into a loop of repeating signal resending by a different procedure in the calling and receiving terminals as in the past. It becomes possible to do.

In addition, the ITU-T
Recommendation V. 21 high-pass channels V.21. 21 (H) is provided with a flag detection unit for detecting the flag pattern of the HDLC frame, and after the start of the CM signal transmission, the modem unit provides the ITU-T recommendation V.264. The detection of the JM signal by 8 is started,
In accordance with the detection output from the flag detection section, the ITU-T recommendation T.264 is provided by the modem section. Since the detection of the binary procedure signal based on 30 is started, the ITU-
Recommendation V.T. ITU-T at the same time as detection of JM signal by 8
Recommendation T. The presence or absence of 30 binary procedure signals can be detected, and more accurate and quick communication control can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a communication terminal device according to an embodiment of the present invention.

FIG. 2 is a sequence diagram showing an operation at the time of starting communication.

FIG. 3 is a sequence diagram showing an operation at the start of conventional communication.

[Explanation of symbols]

1 ... Modem section, 2 ... Flag detecting section, 3 ... Control section, 4 ... Line interface section.

Claims (3)

[Claims] 1. An ITU-T Recommendation V. 34 has a modem section conforming to ITU-T Recommendation V.34. 8
In a communication terminal device that performs a predetermined communication operation by transmitting and receiving various signals based on ITU-T Recommendation V.3 from a called terminal. 8 based on JM signals and ITU-T Recommendation T.38 from the called terminal. 30 to receive a binary procedure signal based on ITU-T Recommendation V.30 from a called terminal after a call is made. 8 by A
If the NSam signal is detected, ITU-T Recommendation V.27.
8 is transmitted, and when the JM signal is detected by the modem section during the transmission of the CM signal, the ITU-T Recommendation V.8. 34, the mode shifts to the facsimile communication operation according to the procedure of ITU-T Recommendation T.34. When a binary procedure signal based on H.30 is detected, the ITU-T Recommendation V.30 is notified from the called terminal. ITU-T Recommendation T.34 depending on the presence / absence of the modulation method of T.34. 30 or I
TU-T Recommendation V. And a control unit for controlling to shift to a facsimile communication operation according to the reference numeral 34. 2. The communication terminal device according to claim 1, wherein the reception output of the modem section is changed to ITU-T Recommendation V.27. 21 high-pass channels V.21. A flag detection unit for detecting a flag pattern of the HDLC frame modulated at 21 (H) is provided, and the control unit, after starting the CM signal transmission, uses the J
A communication terminal device, wherein detection of an M signal is started, and detection of the binary procedure signal is started by a modem unit according to a detection output from a flag detection unit. 3. The method according to ITU-T Recommendation V.3. 34 has a modem section conforming to ITU-T Recommendation V.34. 8
In a communication terminal device that performs a predetermined communication operation by transmitting and receiving various signals based on ITU-T Recommendation V.3 from a called terminal. 8 based on JM signals and ITU-T Recommendation T.38 from the called terminal. A modem section for receiving a binary procedure signal based on ITU-T Recommendation V.30 from the called terminal after calling is provided. 8 by A
If the NSam signal is detected, ITU-T Recommendation V.27.
8 is transmitted, and when the JM signal is detected by the modem section during the transmission of the CM signal, the ITU-T Recommendation V.8. 34, the operation shifts to the facsimile communication operation according to the procedure of No. 34, and the modem unit transmits ITU-T recommendation T. 3
When a binary procedure signal based on 0 is detected, the ITU-T Recommendation V.5 sent from the called terminal is notified. ITU-T Recommendation T.34 depending on the presence / absence of the modulation method of T.34. 30 or ITU-
Recommendation V.T. 34. A communication control method for a communication terminal device, characterized in that a shift to a facsimile communication operation by 34 is made.