JP3512007B2 - Communication terminal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ITU-T Recommendation V.50. The present invention relates to a communication terminal device such as a facsimile device that performs facsimile transmission using an 8-mode communication procedure, and particularly,
A first communication network such as a public telephone network for converting facsimile image data from a communication terminal device such as a facsimile device, and a first communication device for converting the image data into packet data.
Gateway device, a second communication network such as the Internet, and a second conversion device for converting the above packet data back into image data.
Communication that can be applied to the source communication terminal device in the real-time type Internet facsimile communication system for transmitting to the destination communication terminal device such as a facsimile device via the third gateway network and the third communication network such as a public telephone network Regarding terminal devices.

[0002]

2. Description of the Related Art Conventionally, facsimile image data from a source facsimile device is converted into a public telephone network, a first gateway device for converting the image data into packet data, the Internet, and the packet data is inversely converted into image data. ITU-T recommendation T.264. A real-time type internet facsimile communication system (hereinafter referred to as a conventional example) for transmitting in the same communication procedure as the facsimile communication procedure of No. 30 has been put into practical use. 38.

In this conventional example, a normal facsimile machine of a transmission source is a ITU-T recommendation T.264. Facsimile image data is transmitted to the first gateway device via the public telephone network by the facsimile communication procedure of 30. Then the first
The gateway device converts the received facsimile image data into predetermined packet data and transmits the packet data to the second gateway device via the Internet. And
The second gateway device inversely converts the received packet data into facsimile image data and transmits it to the facsimile device of the other party via the public telephone network. Here, the signal of the communication procedure between the source facsimile machine and the destination facsimile machine is ITU-T Recommendation T.264. A communication procedure signal similar to the communication procedure signal of 30 facsimile is used. However, as the communication procedure signal between the two gateway devices, facsimile communication is performed using packet data.

In the real-time type internet facsimile communication system configured as described above, the total distance of the section of the public telephone network can be shortened, so that the communication fee for transmitting the image data of the facsimile can be reduced. There are advantages.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention For example, V. In the handshake for performing the facsimile communication using the 8-mode communication procedure, there is a problem that the time over occurs because there is no regulation of the reception time over except the ANSam signal.

[0006] In particular, V. Facsimile communication using the 8-mode communication procedure is performed by the above-mentioned ITU-T.
Recommendation T. When applied to the real-time Internet facsimile communication system defined in No. 38, for example,
In particular, the reply of the JM signal may be delayed due to the transmission delay on the Internet.
In the 8-mode communication procedure, dummy data is sent out before the receiving-side facsimile device returns a JM signal to avoid time-out in the transmitting-side facsimile device.

The object of the present invention is to solve the above problems and
V. of the TU-T recommendation. In a communication terminal device such as a facsimile device that performs facsimile communication using the 8-mode communication procedure, even if dummy data is sent during standby for detecting a JM signal, the JM detection signal timer may time out. It is to provide a communication terminal device that can be avoided.

[0008]

SUMMARY OF THE INVENTION A communication terminal device according to the present invention is a V. In a communication terminal device that performs facsimile transmission using the 8-mode communication procedure,
When the Sam signal is detected and the CM signal is sent, the JM signal detection timer is started to set a predetermined normal timer value, and the JM signal is detected before the JM signal detection timer times out. When dummy data is detected while waiting to detect
The communication control means for resetting the M detection signal timer is provided.

In the communication terminal device, preferably, the communication control means uses the JM detection signal timer instead of resetting the JM detection signal timer.
It is characterized in that a time obtained by adding the normal timer value to the maximum dummy data transmission time is set.

Further, in the communication terminal device, preferably, the communication control means detects the DIS signal when the JM detection signal timer times out.

Further, the communication terminal device is preferably a first communication device for converting facsimile image data from a source communication terminal device into a first communication network, and a first gateway device for converting the image data into packet data. Two communication networks,
A source communication terminal device in a real-time internet facsimile communication system for transmitting the packet data to a communication terminal device of a partner via a second gateway device for inversely converting the packet data into image data and a third communication network. It is characterized by being.

[0012]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a real-time type internet facsimile communication system according to an embodiment of the present invention. The real-time type internet facsimile communication system of this embodiment is
TU-T recommendation T.T. It is based on the communication system of the conventional example described in No. 38, and as shown in FIG. 1, the facsimile device 20A of the transmission source and the gateway device 60A are connected via the public telephone network 50A,
The two gateway devices 60A and 60B are connected via the Internet 40, and the gateway device 60B
And the facsimile machine 20B of the other party are connected via the public telephone network 50B. Here, public telephone network 5
0A and 50B may be the same public telephone network or different public telephone networks. Facsimile device 20
Reference numerals 20A and 20B are publicly known facsimile apparatuses for performing facsimile communication via a public telephone network of the related art. In addition, the gateway devices 60A and 60B
Are provided in different places, but are preferably composed of the same device, and are collectively denoted by reference numeral 60.

Here, the sender facsimile machine 20A
ITU-T Recommendation T. In the facsimile communication procedure of 30, the gateway device 60 sends a facsimile message including facsimile image data via the public telephone network 50A.
Send to A. Next, the gateway device 60A converts the received facsimile message including the image data of the facsimile into predetermined packet data and transmits the packet data to the gateway device 60B via the Internet 40.
Then, the gateway device 60B inversely converts the received packet data into a facsimile message including facsimile image data and transmits the facsimile message to the destination facsimile device 20B via the public telephone network 50B. Here, the signal of the communication procedure between the source facsimile device 20A and the destination facsimile device 20B is ITU-T recommendation T.264. A communication procedure signal similar to the communication procedure signal of 30 facsimile is used. However, two gateway devices 60
Facsimile communication is performed by using packet data as a communication procedure signal between A and 60B. Further, in the present specification, the facsimile message means a message signal for transmitting a procedure signal for facsimile communication and image data.

Facsimile apparatus 20A according to the present embodiment
The main control unit 1 of the ITU-T recommendation V. When performing facsimile transmission using the 8-mode communication procedure,
The NSam signal is detected (in step S4 of FIG.
m detection), after sending the CM signal (step S1 in FIG. 5)
1) Start the JM signal detection timer, set a predetermined normal timer value (step S12), and wait for detecting the JM signal when the JM signal is detected before the JM signal detection timer times out. When dummy data is detected in the middle (YE in step S16)
S) The JM detection signal timer is reset (step S17).

Further, the main control section 1 of the facsimile apparatus 20A has the communication control means, when the JM detection signal timer has timed out (YE at step S18).
S) and the DIS signal are detected (step S20).

FIG. 2 shows a facsimile machine 20 (2
It is a block diagram which shows the structure of 0A, 20B). In FIG. 2, the facsimile device 20 has a facsimile communication function such as the conventional G3 method. The main control unit 1 is specifically configured by a CPU, is connected to the following hardware units via a bus 13 and controls them, and also executes various software functions 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 monochrome binary. The image recording unit 3 is a printer device such as an electrophotographic system, and prints out and records the image data received by facsimile communication from another facsimile device as a hard copy. The display unit 4 is a display device such as a liquid crystal display (LCD) or a CRT display, and displays the operating 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 device 20, a numeric keypad for dialing,
It has speed dial keys, one-touch dial keys, and various function keys. By using the touch panel system for the display unit 4 described above, the operation unit 5
You may comprise so that some or all of the various keys of may be substituted.

The ROM 6 stores in advance programs of various software required for the operation of the facsimile device 20 and executed by the main controller 1. In addition, these programs are, for example, floppy (registered trademark)
The data is recorded on a recording medium such as a disk, an MO, a DVD-RAM, etc., and if necessary, the RAM 7 via the drive device.
Alternatively, the program may be executed by loading the program into. RAM
An SRAM 7 is used as a working area of the main controller 1 and stores temporary data generated when the program is executed. The compact flash (registered trademark) 8 has an image data memory area 8a for storing image data before and after encoding or before and after decoding.

The fax modem 10 is a public telephone line L
It is a modem that is connected to the public telephone network 50 via the and has a function of a fax modem for normal facsimile communication, demodulates the data of the outgoing telephone number information received as an FSK signal, and outputs it to the main control unit 1. . 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 has an automatic dialing function, and if necessary, the fax modem 10 To the public telephone line L. Here, the NCU 11 detects an ID receiving terminal activation signal and a normal telephone call signal in the calling telephone number notification service, and if necessary, a primary response signal and 2 in the calling telephone number notification service.
The next response signal can be transmitted. In addition, NCU11
May be connected to a baseband transmission type digital line (for example, ISDN line) via a predetermined terminal adapter and a DSU (subscriber line terminating device: Digital Service Unit).

In the facsimile communication function of the facsimile apparatus 20 of the present embodiment configured as described above, the dot image data read by the image reading unit 2 is MH, MR, which is defined by the facsimile communication standard.
After being encoded by software according to an encoding method such as MMR, it is transmitted to the gateway device 60A, 60B or the facsimile device of the other party, while on the contrary, the facsimile device of the other party or the gateway device 60A, 60B.
The encoded data received from is also decoded into image data by software and output from the image recording unit 3 as a hard copy. Here, the main control unit 1 of the facsimile device 20A is characterized by executing the facsimile transmission process of FIGS. 4 and 5.

FIG. 3 shows the gateway device 60 (6
It is a block diagram which shows the structure of 0A, 60B).

In FIG. 3, the gateway device 60 is
For example, the main control unit 101 is composed of a digital computer such as a personal computer or a workstation.
Facsimile image data is received from the source facsimile device 20A of FIG. 1 via the public telephone network 50 and the public telephone line L2, and the received facsimile image data is converted into packet data of the image data, and then the router. It is transmitted to the gateway device 60B via the device 109 and the Internet 40. On the other hand, the main control unit 101
From the gateway device 60A of FIG.
0 and the router device 109, the packet data of the image data is received, the packet data of the received image data is inversely converted into the image data for normal facsimile communication, and then the public telephone line L2 and the public telephone network 50B are connected. Via the destination facsimile machine 20B. The facsimile device 20A to the gateway device 60
When transmitting facsimile image data to the facsimile apparatus 20B via the A. and 60B, the ITU-T recommendation T.264. The procedure signal in the facsimile communication procedure of 30 is exchanged between the facsimile device 20A and the facsimile device 20B.

Here, the main control unit 101 is specifically a CP
It is composed of U and is connected to the following hardware units via the bus 13 to control them and execute various software functions described later. Display unit 10
Reference numeral 4 denotes a display device such as a liquid crystal display device (LCD) or a CRT display, which displays the operating state of the gateway device 60. The operation unit 105 includes character keys necessary for operating the gateway device 60, a numeric keypad for dialing, a speed dial key, a one-touch dial key,
And various function keys and the like.

The ROM 106 is for the gateway device 6 concerned.
Various software programs required for the operation of 0 and executed by the main control unit 101 are stored in advance, and the programs include at least the programs of the communication control processing of FIGS. 4 and 5. Further, these programs are, for example, floppy disk, MO, DVD-
The program may be recorded in a recording medium such as a RAM and loaded into the RAM 107 via the drive device as necessary to execute the program. The RAM 107 is composed of SRAM, is used as a working area of the main control unit 101, and stores temporary data generated when the program is executed. The hard disk drive 108 is, for example, a storage device that has a built-in recording / reproducing hard disk, and stores data of a facsimile message that is transmitted and received.

Further, the fax modem 110 and NC
U111 is configured similarly to the fax modem 10 and the NCU 11 of the facsimile machine 10, respectively.
111 is connected to the public telephone network 50 through the public telephone line L2. Also, the router device 109 is the Internet 4
The gateway device 60A or 60B of the other party via 0
(Fig. 1). Here, the gateway device 60
The packet data transmitted from A is transferred from the router device 109 of the gateway device 60A and sent to the gateway device 60B of the other party via the Internet 40. On the contrary, the packet data transmitted from the gateway device 60B is transferred from the router device 109 of the gateway device 60B and is sent to the destination gateway device 60A via the Internet 40. The line connection from the router device 109 to the Internet 40 is not limited to a dedicated line or the like, but may be a dial-up connection using the public telephone line L2.

FIGS. 4 and 5 are flowcharts showing the facsimile transmission process executed by the main control section 1 of the facsimile apparatus 20A shown in FIG.

In FIG. 4, the gateway device 60A is dialed to make a call in step S1, a T0 timer is set, and a CNG signal is transmitted in step S2. Next, in step S3, it is determined whether or not the other party gateway device 60A has responded, and if YES, in step S4 the ANSam signal or C
Whether or not the ED signal is detected is determined, and if NO,
The process of step S4 is repeated, where ANSa
When the C signal is detected, the process proceeds to step S8, and when the ITU-T recommendation T.m. The conventional facsimile transmission process based on 30 is executed, and the facsimile transmission process is ended.

If NO in step S3, it is determined in step S5 whether the T0 timer has timed out. If NO in step S3, the process returns to step S2.
If YES, the process proceeds to step S6. In step S6, it is determined whether the number of redials is 6
When the answer is S, the facsimile transmission process is ended, while when the answer is NO, it is determined in step S7 whether or not 3 minutes have elapsed from the previous dial. If NO in step S7, the process of step S7 is repeated, but if YES, the process returns to step S1 to perform the redial process.

In step S11 of FIG. 5, the CM signal is transmitted, the JM signal detection timer is set to 3 seconds in step S12, and it is determined in step S13 whether or not the JM signal is detected. In step S14, the CJ signal is transmitted, and in step S15
In V. After performing the facsimile transmission process based on the 34 mode, the facsimile transmission process is ended.

On the other hand, if NO in step S13, it is determined whether or not the dummy data is detected in step S16, and if YES, step S17.
After resetting the JM signal detection timer in step S13, the process returns to step S13. On the other hand, if NO in step S16, it is determined in step S18 whether or not the JM signal detection timer has timed out. If NO, the process returns to step S13, and if YES,
In step S19, the V. The facsimile transmission process based on the 8 mode is completed, and in step S20, DI
ITU-T Recommendation T.S., which includes detection of S signal, transmission of DCS signal, TSI signal and NSS signal and training signal, transmission of image data, and the like. Facsimile transmission processing based on 30 is performed. After this step S20, the facsimile transmission process ends.

As described above, according to the present embodiment, the main control section 1 of the facsimile apparatus 20A has the ITU-
V. T. Recommendation When performing facsimile transmission using the 8-mode communication procedure, after detecting the ANSam signal (ANSam detection in step S4 of FIG. 4) and sending the CM signal (step S11 of FIG. 5), the JM signal detection timer is set. When the dummy data is detected during the standby for detecting the JM signal when the JM signal is detected before the JM signal detection timer times out by setting the predetermined normal timer value after starting (step S12). (YES in step S16) The JM detection signal timer is reset (step S17). Therefore, even if the dummy data is sent during the standby for detecting the JM signal, the JM detection signal timer does not time out, a reception error does not occur, and the V. 34 mode or T.34. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

Further, the main control section 1 of the facsimile apparatus 20A has the communication control means, when the JM detection signal timer has timed out (YE at step S18).
S), the DIS signal is detected (step S20). Therefore, when the JM detection signal timer times out, T.T. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

<Modification> In the above embodiments, the public telephone networks 50A, 50B and the Internet 40 are used, but the present invention is not limited to this, and the public telephone networks 50A, 50A,
50B may be the same public telephone network or various other circuit switched networks, and the Internet 40 may be various packet switched networks or leased lines.

In the above embodiments, an example of the facsimile device 20 is described, but the present invention is not limited to this, and for example, a telephone or data connected to a public network such as a public telephone network or a public digital communication network. It can be applied to a communication terminal device including a communication device and the like.

In the above embodiment, the T.T. Although a communication terminal device such as a sender facsimile device in the real-time type Internet facsimile communication system defined in No. 38 is described, the present invention is not limited to this, and the communication terminal device is directly connected via a communication network such as a public telephone network. In addition, V. The present invention can be applied to a communication terminal device such as a facsimile device that performs facsimile communication using the 8-mode communication procedure. Therefore, IT
U.T. Recommendation T.S. In the real-time Internet facsimile communication system based on the regulation No. 38, JM
Even if dummy data is sent during standby for detecting a signal, the JM detection signal timer does not time out, a reception error does not occur, and V. 34 mode or T.34. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

In the above embodiment, the JM detection signal timer is reset in step S17 of FIG. 5, but the present invention is not limited to this, and the JM detection signal timer is set to the maximum dummy data transmission time (for example, You may make it set the time which added the said normal timer value (for example, 3 seconds) to 2 seconds. Even in this case, JM
Even if dummy data is sent during standby for detecting a signal, the JM detection signal timer does not time out, a reception error does not occur, and V. 34 mode or T.34. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

[0038]

As described above in detail, according to the communication terminal device of the present invention, V. In a communication terminal device that performs facsimile transmission using an 8-mode communication procedure, after detecting an ANSam signal and transmitting a CM signal, a JM signal detection timer is activated to set a predetermined normal timer value, and the JM signal is transmitted. If the JM signal is detected before the detection timer times out, J
Communication control means for resetting the JM detection signal timer when dummy data is detected during standby for detecting the M signal is provided. Therefore, even if the dummy data is sent during the standby for detecting the JM signal, the JM detection signal timer does not time out, a reception error does not occur, and the V. 34 mode or T.34. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

In the communication terminal device, the communication control means preferably uses the JM detection signal timer instead of resetting the JM detection signal timer.
The time obtained by adding the above normal timer value to the maximum dummy data transmission time is set. Therefore, even if the dummy data is transmitted during the standby for detecting the JM signal,
The detection signal timer never expires,
A reception error does not occur, and V. 34 mode or T.34. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

In the communication terminal device, the communication control means preferably detects the DIS signal when the JM detection signal timer times out.
Therefore, when the JM detection signal timer times out, T.T. The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 30.

Further, preferably, the communication terminal device is a first gateway device for converting facsimile image data from a source communication terminal device into a first communication network and a first gateway device for converting the image data into packet data. Two communication networks,
A source communication terminal device in a real-time internet facsimile communication system for transmitting the packet data to a communication terminal device of a partner via a second gateway device for inversely converting the packet data into image data and a third communication network. is there. Therefore, the T. In the real-time type internet facsimile communication system based on the regulation No. 38, even if dummy data is sent during the standby for detecting the JM signal, the JM detection signal timer does not time out and a reception error does not occur. , ITU-T Recommendation V. 34 mode or T.34. Three
The facsimile communication can be continued by returning to the communication procedure of the normal facsimile communication of 0.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a real-time type internet facsimile communication system according to an embodiment of the present invention.

FIG. 2 shows a facsimile device 20 (20A, 20 of FIG.
It is a block diagram which shows the structure of B).

FIG. 3 is a diagram illustrating a gateway device 60 (60A, 60) of FIG.
It is a block diagram which shows the structure of B).

4 is a main control unit 1 of the facsimile device 20A of FIG.
6 is a flowchart showing a first part of a facsimile transmission process executed by.

5 is a main control unit 1 of the facsimile device 20A of FIG.
7 is a flowchart showing a second part of the facsimile transmission process executed by the.

[Explanation of symbols]

1 ... Main control unit, 2 ... Image reading unit, 3 ... Image recording section, 4 ... Display, 5 ... operation part, 6 ... ROM, 7 ... RAM, 8 ... Compact flash, 8a ... Image data memory area, 10 ... fax modem, 11 ... NCU, 13 ... bus, 20, 20A, 20B ... Facsimile device, 40 ... Internet, 50, 50A, 50B ... Public telephone network, 60, 60A, 60B ... Gateway device, 101 ... Main control unit, 104 ... Display, 105 ... operation part, 106 ... ROM, 107 ... RAM, 108 ... hard disk drive, 109 ... router device, 110 ... fax modem, 111 ... NCU, 113 ... bus, L1, L2 ... Public telephone line.

Claims (4)

(57) [Claims] 1. V. of ITU-T recommendation. In a communication terminal device that performs facsimile transmission using an 8-mode communication procedure, after detecting an ANSam signal and transmitting a CM signal,
When the JM signal detection timer is activated, a predetermined normal timer value is set, and when the JM signal is detected before the JM signal detection timer times out, dummy data is detected while waiting for the JM signal to be detected. A communication terminal device comprising communication control means for resetting the JM detection signal timer. 2. The communication control means sets, instead of resetting the JM detection signal timer, a time obtained by adding the normal timer value to the maximum dummy data transmission time in the JM detection signal timer. The communication terminal device according to claim 1, wherein 3. The communication terminal device according to claim 1, wherein the communication control means detects a DIS signal when the JM detection signal timer times out. 4. The communication terminal device comprises a first communication network for converting facsimile image data from a source communication terminal device, a first gateway device for converting the image data into packet data, and a second communication device. A communication terminal of a sender in a real-time internet facsimile communication system for transmitting to a communication terminal device of a partner via a network, a second gateway device for inversely converting the packet data into image data, and a third communication network It is a device, The communication terminal device as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned.