JP2005130036A - Communication terminal equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide communication terminal equipment such as a facsimile machine capable of reducing the number of occurrence times of communication errors when executing data communication such as image communication via an IP phone network. <P>SOLUTION: A main control section 1 of a facsimile machine 20 detects whether or not an opposite facsimile machine is connected to the IP phone network depending on whether or not the main control section 1 detects a number "050" (an identification number) of an IP phone at the head of a telephone number to be dialed, the main control section 1 detects that the opposite facsimile machine is connected to the IP phone network (YES in a step S3 shown in Figure), the main control section 1 clears a high speed flag (step S5), then (NO in a step S7) proceeds to a step S9 for controlling a FAX MODEM 10 such that a maximum data speed of a FAX MODEM 10 is set to 9600 bps and a maximum symbol rate of the MODEM is set to 2400 baud. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication terminal apparatus that controls the maximum data rate or maximum symbol rate of a modem such as a facsimile apparatus.

  In the conventional G3 mode facsimile apparatus, training for transmitting and receiving test signals is performed before transmission of image data to determine communication conditions such as a data rate, and then transmission and reception of image data is performed.

  For example, in Patent Document 1, “one digit of a dial number indicated by a dial number signal to be sent to a line in a facsimile apparatus is used to prevent a malfunction such as a communication error from occurring by using the latest modulation method. It is determined whether or not the eye number matches a preset setting value (step S2 in FIG. 2 of Patent Document 1), and if they do not match (N in step S2), a fax is scanned using the V34 modulation method. Although it is transmitted (step S4), if they match (Y in step S2), the fax is transmitted after changing to the V17 modulation method (step S3). "

JP 2000-175011 A.

  In recent years, when performing facsimile image communication via an IP telephone network, there has been a problem that communication errors frequently occur when the modem data rate and symbol rate are high.

  An object of the present invention is to solve the above problems and provide a communication terminal device such as a facsimile device capable of reducing communication errors when data communication such as image communication is executed via an IP telephone network. There is.

The communication terminal device according to the present invention comprises a detecting means for detecting whether or not the counterpart communication terminal device is connected to the IP telephone network,
Control means for controlling to decrease at least one of the maximum data rate and the maximum symbol rate of the modem when the detecting means detects that the communication terminal device of the other party is connected to the IP telephone network. It is characterized by.

  In the communication terminal apparatus, the detecting means determines whether or not the partner communication terminal apparatus is connected to the IP telephone network based on whether or not the identification number of the IP telephone is detected at the head of the telephone number to be dialed. It is characterized by detecting.

  In the communication terminal apparatus, when the control means detects that the communication terminal apparatus of the other party is connected to the IP telephone network, the data communication based on the communication standard of ITU-T recommendation V34. The modem is controlled so as to execute data communication based on the communication standard of V17 of ITU-T recommendation without masking and executing. Instead, in the communication terminal device, the control means sets the maximum data rate of the modem to 9600 bps when the detecting means detects that the other communication terminal device is connected to the IP telephone network. Or controlling the modem to set the maximum symbol rate of the modem to 2400 baud.

  According to the communication terminal apparatus of the present invention, the detecting means for detecting whether or not the other party communication terminal apparatus is connected to the IP telephone network, and the other party communication terminal apparatus is connected to the IP telephone network by the detecting means. And a control means for controlling to reduce at least one of the maximum data rate and the maximum symbol rate of the modem. Specifically, for example, when it is detected that the communication terminal device of the other party is connected to the IP telephone network, V34 communication standardized by the recommendation of ITU-T (International Telecommunication Union-Telecommunication Standardization Sector). The modem is controlled so as to execute data communication based on the communication standard of V17 of ITU-T recommendation without masking data communication based on the standard, or instead, the maximum of the fax modem 10 is controlled. The fax modem 10 is controlled to set the data rate to 9600 bps or set the maximum symbol rate of the modem to 2400 baud. Accordingly, it is possible to prevent a communication error in data communication such as facsimile image communication, and it is possible to reduce a communication time and an increase in communication charge because a useless training procedure is not repeated (fallback).

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

<Embodiment>
FIG. 1 is a block diagram showing a configuration of a facsimile machine 20 having a modem control function based on a telephone number to be dialed according to an embodiment of the present invention.

  The main control unit 1 of the facsimile apparatus 20 of this embodiment detects whether or not the other party's facsimile apparatus is connected to the IP telephone network based on whether or not “050” at the head of the telephone number to be dialed is detected. When it is detected that the other party's facsimile apparatus is connected to the IP telephone network (YES in step S3 in FIG. 2), the high speed flag is turned off (step S5), and at this time (NO in step S7), the fax modem The facsimile modem 10 is controlled to set the maximum data rate of 10 to 9600 bps and the maximum symbol rate of the modem to 2400 baud (step S9).

  In FIG. 1, a facsimile machine 20 has a conventional facsimile communication function such as a G3 system and a modem control function based on a telephone number to be dialed. 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 are executed by the main control unit 1. Here, the programs include at least the transmission 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 a modem control function based on a telephone number to be dialed in addition to a normal facsimile communication function such as the G3 system. 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 by the standard for facsimile communication, 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, a communication procedure in the V34 mode capable of data communication such as facsimile communication at high speed will be described. When data communication is performed with a communication terminal device such as a facsimile device, a modem device conforming to the communication procedure of the recommended V17 mode of ITU-T, for example, is used, and the facsimile communication procedure of the G3 standard is also used. This is performed according to the procedure specified in Recommendation T30. In addition, an ultra-high speed communication procedure (hereinafter referred to as V34 mode communication procedure) with a maximum transmission rate of 33.6 kbps conforming to the recommendation V34 has been put into practical use. During communication execution, the receiving side can specify the communication speed according to the current line status, specifically S / N (signal-to-noise power ratio) and bandwidth. In this way, the communication speed is changed so that transmission is performed at the communication speed specified on the receiving side. When data communication is performed using the communication procedure in the V34 mode, the actual communication speed is determined by performing the pre-procedure in the same recommended V8 communication procedure.

  Here, the relationship between the data rate and the symbol rate when performing data communication in the V34 mode is shown in the following table.

[Table 1]
Relationship between data rate and symbol rate in V34 mode ―――――――――――――――――――――――――――――――――――
Data rate (bps) Symbol rate (symbols / second)
―――――――――――――――――――――――――――――――――――
2400 2400
4800 2400, 2800, 3000, 3200, 3429
7200 2400, 2800, 3000, 3200, 3429
9600 2400, 2800, 3000, 3200, 3429
12000 2400, 2800, 3000, 3200, 3429
14400 2400, 2800, 3000, 3200, 3429
16800 2400, 2800, 3000, 3200, 3429
19200 2400, 2800, 3000, 3200, 3429
21600 2400, 2800, 3000, 3200, 3429
24000 2800, 3000, 3200, 3429
26400 2800, 3000, 3200, 3429
28800 3000, 3200, 3429
31200 3200, 3429
33600 3429
―――――――――――――――――――――――――――――――――――

  Also, in the V17 mode of the ITU-T recommendation, the data rate and symbol rate are based on the communication result of the training signal between 14400 bps (symbol rate = 2400 symbols / second, etc.) to 2400 bps (symbol rate = 2400 symbols / second). It is determined.

  FIG. 2 is a flowchart showing the outgoing call processing according to the embodiment, which is executed by the main control unit 1 of the facsimile machine 20 of FIG.

  In step S1 of FIG. 2, it is first determined whether or not a call has been made. If YES, the process proceeds to step S2, while if NO, the process returns to step S1. Next, in step S2, the dial number is checked. In step S3, it is determined whether or not the top of the dial number is “050”. If YES, the process proceeds to step S5. If NO, the process proceeds to step S4. After the high speed flag is turned on in step S4, the process proceeds to step S6. In step S5, after the high speed flag is turned off, the dial number of the other party is transmitted in dial processing in step S6. In step S7, it is determined whether or not the high speed flag is on. If YES in step S7, the process proceeds to step S8. If NO, the process proceeds to step S9. In step S8, the maximum symbol rate of the fax modem 10 is set to 3429 baud, the maximum data rate is set to 336 kbpS, and the process proceeds to step S10. In step S9, the maximum symbol rate of the fax modem 10 is set to 2400 baud and the maximum data rate is set to 9600 bps. Then, the process proceeds to step S10. In step S10, facsimile transmission processing is executed. In the first process of the facsimile transmission process, the training process is executed based on the set maximum symbol rate and the maximum data rate, and the symbol rate and data rate of the fax modem 10 that is actually executed based on the training signal. To transmit / receive image data. Further, after the line is released in step S11, the process returns to step S1.

  As described above, according to the present embodiment, the main control unit 1 of the facsimile machine 20 determines whether the other party's facsimile machine is an IP telephone network based on whether or not “050” at the head of the telephone number to be dialed is detected. Connected to the IP telephone network (YES in step S3 in FIG. 2), the high speed flag is turned off (step S5). (NO in step S7), the fax modem 10 is controlled to set the maximum data rate of the fax modem 10 to 9600 bps and the maximum symbol rate of the modem to 2400 baud (step S9). Accordingly, communication errors in facsimile image communication can be prevented, and unnecessary training procedures are not repeated (fallback), so that the communication time can be shortened and the increase in communication charges can be reduced.

<Modification>
FIG. 3 is a flowchart showing a transmission process according to a modification executed by the main control unit 1 of the facsimile apparatus 20 of FIG.

  In step S1 of FIG. 3, it is first determined whether or not a call is made. If YES, the process proceeds to step S2, while if NO, the process returns to step S1. Next, in step S2, the dial number is checked. In step S3, it is determined whether or not the head of the dial number is “050”. If YES, the process proceeds to step S5A. If NO, the process proceeds to step S4A. After turning on the V34 mode flag in step S4A, the process proceeds to step S6. In step S5A, after the V34 mode flag is turned off, the dial number of the other party is transmitted in dial processing in step S6. In step S7, it is determined whether or not the V34 mode flag is on. If YES in step S7, the process proceeds to step S9A. If NO, the process proceeds to step S8A. In step S8A, the facsimile modem 10 is used to mask and execute the V34 mode, and the facsimile transmission process is executed in the V17 mode. Then, the process proceeds to step S11. On the other hand, in step S9A, the facsimile modem 10 is used to execute facsimile transmission processing in the V17 mode, and then the process proceeds to step S11. In the first process of the facsimile transmission process, the training process is executed based on the set maximum symbol rate and the maximum data rate, and the symbol rate and data rate of the fax modem 10 that is actually executed based on the training signal. To transmit / receive image data. Further, after the line is released in step S11, the process returns to step S1.

  As described above, according to the present embodiment, the main control unit 1 of the facsimile machine 20 determines whether the other party's facsimile machine is an IP telephone network based on whether or not “050” at the head of the telephone number to be dialed is detected. Connected to the IP telephone network (YES in step S3 in FIG. 3), the V34 mode flag is turned off (step S5A), and this is detected. (NO in step S7A), the facsimile modem 10 is controlled so as to set the operation mode of the fax modem 10 to the V17 mode, and the facsimile transmission process is executed (step S8A). Accordingly, communication errors in facsimile image communication can be prevented, and unnecessary training procedures are not repeated (fallback), so that the communication time can be shortened and the increase in communication charges can be reduced.

  In the above embodiment, an example of the facsimile apparatus 20 has been described. However, the present invention is not limited to this, and for example, a telephone connected to a public network such as an IP telephone network, a public telephone network, or a public digital circuit network, The present invention can be applied to communication terminal devices including data communication devices.

  In the above embodiment, it is detected whether or not a communication terminal device such as a facsimile machine of the other party is connected to the IP telephone network based on whether or not the leading “050” of the telephone number to be dialed is detected. However, the communication terminal device such as the other party's facsimile device is connected to the IP telephone network based on the identification number of the other IP phone indicating that the communication terminal device such as the other party's facsimile device is connected to the IP telephone network. You may detect whether it is.

  In the above embodiment, when it is detected that a communication terminal device such as a facsimile machine of the other party is connected to the IP telephone network, the data communication based on the communication standard of V34 of ITU-T recommendation is masked and executed. First, the fax modem 10 is controlled so as to execute data communication based on the communication standard of ITU-T recommendation V17, or the maximum data rate of the fax modem 10 is set to 9600 bps, or the symbol rate of the fax modem 10 is set. The fax modem 10 is controlled to set 2400 baud. However, the present invention is not limited to this, and the fax modem 10 may be controlled to reduce at least one of the maximum data rate and the maximum symbol rate.

1 is a block diagram showing a configuration of a facsimile machine 20 having a modem control function based on a telephone number to be dialed according to an embodiment of the present invention. It is a flowchart which shows the transmission process which concerns on embodiment performed by the main control part 1 of the facsimile apparatus 20 of FIG. It is a flowchart which shows the transmission process which concerns on the modification performed by the main control part 1 of the facsimile apparatus 20 of FIG.

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)

Detecting means for detecting whether or not the communication terminal device of the other party is connected to the IP telephone network;
Control means for controlling to decrease at least one of the maximum data rate and the maximum symbol rate of the modem when the detecting means detects that the communication terminal device of the other party is connected to the IP telephone network. A communication terminal device.   The detecting means detects whether or not the communication terminal device of the other party is connected to the IP telephone network based on whether or not the identification number of the IP telephone is detected at the head of the telephone number to be dialed. The communication terminal device according to claim 1.   When the control means detects that the communication terminal device of the other party is connected to the IP telephone network by the detection means, the control means does not mask and execute data communication based on the communication standard of V34 of ITU-T recommendation, 3. The communication terminal apparatus according to claim 1, wherein the modem is controlled to execute data communication based on a communication standard of V17 of ITU-T recommendation. The control means sets the maximum data rate of the modem to 9600 bps or sets the maximum symbol rate of the modem to 2400 when the detection means detects that the communication terminal device of the other party is connected to the IP telephone network. 3. The communication terminal apparatus according to claim 1, wherein the modem is controlled so as to set to baud.

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