JP2006050068A - Communication terminal device and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal device capable of more surely carrying out facsimile reception via an IP network with a simpler method compared with conventional technology. <P>SOLUTION: A main control section 1 in a facsimile machine for carrying out facsimile communication by using facsimile communication procedure signals transmits a DIS signal (step S6) when the main control section 1 transmits an ANSam signal in the facsimile V.8 mode (in step S2) and thereafter detects no CM signal within a prescribed specified time (e.g., 3 seconds) (NO in step S3 and YES in step S5), and retransmits the DIS signal (step S6) after waiting for a prescribed specified time (e.g., 500 ms) when receiving the DIS signal after the transmission of the DIS signal (YES in step S7 and YES in step S10). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication terminal apparatus such as a facsimile apparatus and a communication method.

  In recent years, facsimile communication via an Internet protocol telephone (hereinafter referred to as an IP telephone) or an IP telephone line has started to spread through a network (hereinafter referred to as an IP network) that performs communication using an Internet protocol such as the Internet. Yes. Here, in facsimile communication via an IP telephone or an IP telephone line, an echo of a facsimile signal is generated and a communication trouble occurs.

  For example, Patent Document 1 discloses a facsimile apparatus for echo countermeasures in communication via an artificial satellite route. In this conventional example, the satellite route on the transmission path is automatically determined for each destination, the effect of echo is measured for each determined transmission path, the correction condition is stored, and correction is made during facsimile communication to the measured destination. The purpose is to implement echo countermeasures by automatically setting conditions. Specifically, when the telephone number of the transmission destination facsimile terminal is input from the operation unit, the CPU analyzes the input telephone number and determines whether the other party has a satellite route set on the transmission path and measures against echoes. Determine if you need it. When echo countermeasures are not required, the conventional CCITT recommendation T.I. When transmission processing by the G3 communication protocol based on 30 is executed and echo countermeasures are required, the signal transmission delay data of the destination area written in the RAM is referred to, and a correction condition for correcting the influence of echo is added and T . A transmission process based on the G3 communication protocol based on 30 is executed.

JP-A-5-056246.

  However, the conventional method is an echo countermeasure in communication via an artificial satellite route and cannot be applied in communication via an IP network. In particular, as shown in FIG. When an ANSam signal (2100 Hz modulation signal), which is a modified response tone indicating that it has an 8-mode communication procedure function, is transmitted, the echo suppressor of the gateway device is turned off and the echo of the DIS signal is received on the receiving side. There was a problem of returning to the facsimile machine.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a communication terminal device such as a facsimile device and a communication method capable of receiving a facsimile via an IP network more reliably by a simpler method than the prior art. There is.

A communication terminal apparatus according to the present invention is a communication terminal apparatus that performs facsimile communication using a facsimile communication procedure signal.
When the DIS signal is received when the DIS signal is transmitted, control means for retransmitting the DIS signal after waiting for a predetermined first specified time is provided.

  In the communication terminal device, the control means is a facsimile V.P. When the CM signal is not detected within a predetermined second predetermined time after the 8-mode ANSam signal is transmitted, the DIS signal is transmitted.

The communication method according to the present invention is a communication method for performing facsimile communication using a facsimile communication procedure signal.
When the DIS signal is received when the DIS signal is transmitted, a control step of retransmitting the DIS signal after waiting for a predetermined first specified time is included.

  In the communication method, the control step includes a facsimile V.D. When the CM signal is not detected within a predetermined second predetermined time after the 8-mode ANSam signal is transmitted, the DIS signal is transmitted.

  Therefore, according to the communication terminal device and the communication method of the present invention, in the communication terminal device that performs facsimile communication using the facsimile communication procedure signal, when the DIS signal is received when the DIS signal is transmitted, the predetermined first After waiting for a specified time, the DIS signal is retransmitted. Here, the facsimile V.D. When the CM signal is not detected within a predetermined second specified time after the ANSam signal in the 8 mode is transmitted, the DIS signal is transmitted. Therefore, as shown in FIG. 2 (b), the echo of the DIS signal is received in response to the transmission of the DIS signal, but at this time, the echo suppressor of the gateway device is turned on since waiting for a predetermined period. The echo of the DIS signal does not occur and the normal communication procedure of the facsimile signal can be executed. As a result, when the facsimile communication is via the IP network, the above-described IP network countermeasure processing is executed, so that facsimile reception can be performed via the IP network more reliably by a simpler method than in the prior art.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a facsimile machine 20 having an IP network countermeasure function according to an embodiment of the present invention. The facsimile apparatus 20 of this embodiment is a communication terminal apparatus that performs facsimile communication using a facsimile communication procedure signal. After sending the ANSam signal in 8 mode (step S2 in FIG. 3), when the CM signal is not detected within a predetermined time (for example, 3 seconds) (NO in step S3 and YES in step S5), the DIS signal is When a DIS signal is received during sending (step S6) (YES in step S7 and YES in step S10), a predetermined specified time (for example, 500 milliseconds, may be 500 milliseconds or more and 3 seconds or less). .) After waiting, the DIS signal is retransmitted (step S6).

  In FIG. 1, a facsimile machine 20 has a conventional facsimile communication function such as a G3 system and an IP network countermeasure function. The main control unit 1 is specifically composed of a CPU, and is connected to the following hardware units via the bus 13 to control them, and executes various software functions to be described later. The image reading unit 2 reads a document with a scanner using a CCD or the like, and outputs dot image data converted into black and white binary. The image recording unit 3 is an electrophotographic printer or the like, and prints out image data received from another facsimile apparatus by facsimile communication as a hard copy and records it. The display unit 4 is a display device such as a liquid crystal display device (LCD) or a CRT display, and displays the operation state of the facsimile device 20 and displays image data of a document to be transmitted and received image data. .

  The operation unit 5 includes character keys necessary for operating the facsimile apparatus 20, a dial keypad, a speed dial key, a one-touch dial key, various function keys, and the like. In addition, you may comprise so that a part or all of the various keys of this operation part 5 may be substituted by making the above-mentioned display part 4 into a touch panel system.

  The ROM 6 stores in advance various software programs that are necessary for the operation of the facsimile apparatus 20 and executed by the main control unit 1, and the programs include at least the facsimile reception processing program of FIG. . The RAM 7 is configured by SRAM, flash memory, or the like, and is used as a working area for the main control unit 1 to store temporary data generated when the program is executed. When a flash memory is used as the RAM 7, the contents of the data are not lost even when the power is cut off due to a power failure, movement of the device, or the like. The image memory 8 is composed of a DRAM or the like, and stores image data to be transmitted or received image data. Note that the RAM 7 and the image memory 8 may be constituted by a hard disk memory.

  The fax modem 10 is a modem connected to the public telephone line L and having a function of a fax modem for normal facsimile communication. The fax modem 10 demodulates data of outgoing telephone number information received as an FSK signal and sends it to the main control unit 1. Output. An NCU (Network Control Unit) 11 is a hardware circuit that performs an operation of closing and opening a DC loop of an analog public telephone line L and having an automatic dial function. Is connected to the public telephone line L. Here, the NCU 11 detects the ID receiving terminal activation signal and the normal telephone call signal in the outgoing telephone number notification service, and transmits the primary response signal and the secondary response signal in the outgoing telephone number notification service as necessary. can do. The NCU 11 may be connected to a baseband transmission type digital line (for example, an ISDN line) via a predetermined terminal adapter and a DSU (Subscriber Line Termination Unit: Digital Service Unit).

  The facsimile apparatus 20 of the present embodiment configured as described above has an IP network countermeasure function in addition to a normal facsimile communication function such as the G3 method. In the facsimile communication function, the dot image data read by the image reading unit 2 is encoded by software in accordance with an encoding method such as MH, MR, or MMR defined in the facsimile communication standard, and then the counterpart facsimile machine On the other hand, the encoded data received from the facsimile machine of the other party is also decoded into image data by software and output from the image recording unit 3 as a hard copy. The image memory 8 stores the image data as necessary, and conversely outputs the stored image data as necessary.

  Furthermore, V.C. is capable of high-speed data communication such as facsimile communication. 34 mode and V. An 8-mode communication procedure will be described. When data communication is performed with a communication terminal device such as a facsimile device, the recommendation V. of ITU-T, for example, of the half duplex method. The modem uses a modem that conforms to the 17-mode communication procedure, etc., and is a G3 standard facsimile communication procedure. Follow the procedure specified in 30. Also, the recommendation V.I. An ultra-high speed communication procedure (hereinafter referred to as a V.34 mode communication procedure) with a maximum transmission rate of 33.6 kbps conforming to the standard No. 34 has been put into practical use. In the 34-mode communication procedure, at the time of starting communication and during communication execution, the receiving side designates the communication speed according to the line status at that time, specifically, S / N (signal to noise power ratio) and bandwidth. The transmission speed is changed so that transmission is performed at the transmission speed designated on the reception side. V. In the case of performing data communication in the 34-mode communication procedure, the same recommendation V. The actual communication speed is determined by performing the pre-procedure in 8 communication procedures.

  FIG. 3 is a flowchart showing facsimile reception processing executed by the main control unit 1 of FIG.

  In step S1 of FIG. 3, it is first determined whether or not an incoming call has been made, and the process of step S1 is repeated until YES is obtained. An ANSam signal, which is a modified response tone indicating that it has a function of an 8-mode communication procedure, is transmitted. If YES, the process proceeds to step S4. If NO, the process proceeds to step S5. In step S4, V.I. Eight-mode facsimile reception processing is executed. In step S17, the line is opened and the facsimile reception processing is terminated.

  On the other hand, it is determined in step S5 whether or not 3 seconds have elapsed. If YES, the process proceeds to step S6. If NO, the process returns to step S2. In step S6, a DIS signal is sent out. In step S7, it is determined whether a response signal has been received. If YES, the process proceeds to step S10. If NO, the process proceeds to step S8. In step S8, it is determined whether or not the T1 timer of 35 seconds has expired. If YES, the process proceeds to step S9. If NO, the process returns to step S6. In step S9, after the DCN signal is transmitted, the line is opened in step S17 and the facsimile reception process is terminated.

  Next, it is determined in step S10 whether or not a DIS signal has been detected. If YES, the process proceeds to step S11 for 500 milliseconds (this specified time is the time when the echo suppressor of the gateway device is turned on from off). After waiting, the process returns to step S6. If NO in step S10, the process proceeds to step S12. In step S12, it is determined whether a DCS signal is detected. If YES, the process proceeds to step S13. If NO, the process proceeds to step S8. In step S13, it is determined whether or not the training is OK. If YES, the process proceeds to step S15. If NO, the process proceeds to step S14. In step S14, after sending the FTT signal, the process returns to step S7. On the other hand, a CFR signal is transmitted in step S15, image data reception processing is executed in step S16, the line is opened in step S17, and the facsimile reception processing is terminated.

  FIG. 2A is a timing chart showing a conventional facsimile signal procedure, and FIG. 2B is a timing chart showing a facsimile signal procedure according to the embodiment. As shown in FIG. 2A, V.V. When an ANSam signal (2100 Hz modulation signal), which is a modified response tone indicating that it has an 8-mode communication procedure function, is transmitted, the echo suppressor of the gateway device is turned off and the echo of the DIS signal is received on the receiving side. Come back to the facsimile machine. On the other hand, in the embodiment of FIG. 2B, the echo of the DIS signal is received with respect to the transmission of the DIS signal, but at this time, since it waits for 500 seconds, the echo suppressor of the gateway device is turned on. The echo of the DIS signal does not occur and the normal communication procedure of the facsimile signal can be executed.

  As described above, according to the present embodiment, the main control unit 1 is used for the facsimile V. After sending the ANSam signal in 8 mode (step S2 in FIG. 3), when the CM signal is not detected within a predetermined time (for example, 3 seconds) (NO in step S3 and YES in step S5), the DIS signal is When the DIS signal is received during sending (step S6) (YES in step S7 and YES in step S10), after waiting for a predetermined specified time (for example, 500 milliseconds), the DIS signal is re-sent ( Step S6). Accordingly, as shown in FIG. 2 (b), the echo of the DIS signal is received in response to the transmission of the DIS signal, but at this time, since it waits for 500 seconds, the echo suppressor of the gateway device is turned on. The echo of the DIS signal does not occur and the normal communication procedure of the facsimile signal can be executed.

<Modification>
In the above embodiment, the example of the facsimile apparatus 20 has been described. However, the present invention is not limited to this, and for example, a telephone, a data communication apparatus, etc. connected to a public network such as a public telephone network or a public digital circuit network It can apply to the communication terminal device containing.

1 is a block diagram illustrating a configuration of a facsimile machine 20 having an IP network countermeasure function according to an embodiment of the present invention. (A) is a timing chart which shows the facsimile signal procedure of a prior art example, (b) is a timing chart which shows the facsimile signal procedure which concerns on embodiment. 3 is a flowchart showing facsimile reception processing executed by a main control unit 1 in FIG. 1.

Explanation of symbols

1 ... main control part,
2. Image reading unit,
3 ... image recording unit,
4 ... display part,
5 ... operation part,
6 ... ROM,
7 ... RAM,
8 ... Image memory,
10. Fax modem,
11 ... NCU,
13 ... Bus
20 ... facsimile machine,
L: Public telephone line.

Claims (4)

In a communication terminal device that performs facsimile communication using a facsimile communication procedure signal,
A communication terminal apparatus comprising control means for retransmitting a DIS signal after waiting for a predetermined first specified time when the DIS signal is received when the DIS signal is transmitted.   The control means is a facsimile V. 2. The communication terminal apparatus according to claim 1, wherein after transmitting an ANSam signal in 8 mode, the DIS signal is transmitted when a CM signal is not detected within a predetermined second specified time. In a communication method for performing facsimile communication using a facsimile communication procedure signal,
A communication method comprising: a control step of retransmitting a DIS signal after waiting for a predetermined first specified time when the DIS signal is received when the DIS signal is transmitted. The above control step includes the facsimile V. 4. The communication method according to claim 3, wherein the DIS signal is transmitted when the CM signal is not detected within a predetermined second specified time after the ANSam signal in the 8 mode is transmitted.

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