JP5094575B2 - COMMUNICATION TERMINAL DEVICE, COMMUNICATION SYSTEM, COMMUNICATION CONNECTION METHOD, AND COMMUNICATION TERMINAL DEVICE PROGRAM - Google Patents

Description

  The present invention relates to a communication terminal device, a communication system, a communication connection method, and a program for a communication terminal device that exchange signals in a predetermined procedure with a communication partner device such as a facsimile device to establish a communication connection. .

  In general, ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) recommendation V. In a facsimile apparatus capable of executing eight procedures, a V.P. Call processing is performed according to the call setting flow of the eight calling terminals.

  First, as processing by the calling terminal, a CNG signal (Calling; notification signal for FAX transmission) is sent (step S51), and the detection of an ANSam signal (modified response tone signal) from the called terminal is awaited (step S52). If the reception of the ANSam signal is detected (step S52; Yes), the calling terminal sends a CM signal (calling menu signal) (step S53). If the called terminal detects the CM signal, the JM signal (common menu) is detected. Signal), and when the calling terminal detects the JM signal, a CJ signal (CM termination signal) is transmitted. Signal exchange according to 8 procedures is executed.

  Here, when the ANSam signal from the called terminal is not detected and the reception of the DIS signal (digital identification signal) is detected (step S55; Yes), the CI signal (call display signal) or the DCS signal (digital command) Signal). More specifically, the signal received from the called terminal is V.P. 21 and the information of the DIS signal is V.21. When the terminal has 8 capabilities, the calling terminal transmits a CI signal as a retransmission request signal for the ANSam signal (response signal) to the called terminal.

  If the ANSam signal from the called terminal is not detected and the DIS signal is not detected (step S55; No), the calling terminal may be not a FAX apparatus, so that the calling terminal is defined in the ITU-T recommendation. After waiting for a predetermined time (step S54; Yes), the line is disconnected.

  Also, as a related technique of the present invention, when a CI signal is transmitted, a transmission time and a stop time are set in advance by a CI transmission on timer and a CI transmission off timer, and CI transmission is repeatedly turned on and off by the setting. There is one that monitors the ANSam signal in time (see, for example, Patent Document 1).

  Further, as a related technique of the present invention, a CI signal is transmitted, and the received DIS signal is V.V. In the case of having eight functions, there is one in which the counterpart receiver transmits the CI signal again as a result of not being able to receive the CI signal (see, for example, Patent Document 2).

As a related technique of the present invention, V. 34, the presence or absence of the capability is described. In communication with a partner station registered as having 34 capability, there is one in which a signal first received after a call is regarded as an ANSam signal (see, for example, Patent Document 3).
JP 2003-338912 A JP-A-9-214716 Japanese Patent Laid-Open No. 11-112759

  However, the general V.S. In a facsimile apparatus capable of executing the eight procedures, when performing a calling process, a V.P. In order to follow the call setting flow of the eight calling terminals, the CI signal had to be transmitted immediately after receiving the DIS signal even in the situation where the ANSam signal could not be detected. For this reason, there is a possibility that communication for receiving a CI signal cannot be achieved on the called side, resulting in a communication abnormality.

  Further, the above-mentioned Patent Document 1 attempts to prevent a loss of communication time by making it possible to set in advance an on / off time interval for repeatedly sending a CI signal. It was not even considered to ensure the stability of communication by making it easier to take.

  In addition, the above-mentioned Patent Document 2 considers the fact that communication stability is ensured by facilitating synchronization for CI signal reception only by repeatedly transmitting a CI signal until an ANSam signal can be received. It was not what was done.

  In addition, the above-mentioned Patent Document 3 uses V.D. This is to manage the presence or absence of the 34 capability, and it has not been taken into consideration to ensure the stability of communication by facilitating synchronization for CI signal reception.

  The present invention has been made in view of such circumstances, and by changing the signal transmission timing, it is possible to make it easier for the called-side device to synchronize for signal reception, and to prevent communication abnormality. It is an object of the present invention to provide a communication terminal device, a communication system, a communication connection method, and a communication terminal device program that can be avoided.

In order to achieve such an object, the communication terminal apparatus according to the present invention is a V.264 standard for ITU-T. A communication terminal apparatus capable of executing eight procedures, a signal detection means for detecting a signal transmitted from a communication partner apparatus, a signal transmission means for transmitting a signal, and an ANSam signal from the communication partner apparatus by the signal detection means Is not detected and V. Delay means for sending a retransmission request signal for requesting retransmission of the ANSam signal by a signal sending means at a timing delayed by a sending delay time from reception of the DIS signal when receiving a DIS signal (digital identification signal) having eight capabilities ; The delay means receives the nth DIS signal (n ≧ 1), and sets the transmission delay time to be n times the predetermined delay unit time .

  A communication system according to the present invention is characterized in that a plurality of the above-described communication terminal apparatuses according to the present invention are connected via a communication line.

In addition, the communication connection method according to the present invention is described in ITU-T V.264. In step 8, the ANSam signal from the communication partner device is not detected . A transmission delay step of transmitting a retransmission request signal for requesting retransmission of the ANSam signal by a signal transmission means at a timing delayed by a transmission delay time from reception of the DIS signal when receiving a DIS signal (digital identification signal) having eight capabilities. In the transmission delay step, when the nth DIS signal (n ≧ 1) is received, the transmission delay time is set to n times the predetermined delay unit time .

In addition, the program according to the present invention is an ITU-T V.30 program . A program to be executed by a computer of a communication terminal apparatus capable of executing 8 procedures, and an ANSam signal from a communication partner apparatus is not detected . A transmission delay procedure for transmitting a retransmission request signal for requesting retransmission of the ANSam signal by a signal transmission means at a timing delayed by a transmission delay time from reception of the DIS signal when receiving a DIS signal (digital identification signal) having eight capabilities. The transmission delay procedure is characterized in that when the n-th DIS signal (n ≧ 1) is received, the transmission delay time is set to n times a predetermined delay unit time .

  As described above, according to the present invention, it is possible to make it easier for the called-side device to synchronize for signal reception by changing the signal transmission timing. For this reason, communication abnormality can be avoided and communication stability can be ensured.

  Next, an embodiment in which a communication terminal device, a communication system, a communication connection method, and a communication terminal device program according to the present invention are applied to a facsimile apparatus will be described in detail with reference to the drawings.

  Each embodiment of the present invention is an ITU-T V.264 implementation. In step 8, when the calling terminal has not detected the ANSam signal after dialing, the call-side facsimile apparatus determines the CI signal transmission timing that the calling terminal transmits after receiving the DIS signal in consideration of echo and noise. The timing is changed so that the CI signal can be detected. This provides a facsimile apparatus that can ensure the stability of communication.

First, an outline common to the embodiments of the present invention will be described.
As shown in FIG. 1, a facsimile apparatus according to each embodiment of the present invention includes a signal detection unit that detects a signal received via a communication line, a signal transmission unit that transmits a signal to the communication line, and a signal transmission unit. Delay means for delaying the timing.

  When the ANSam (predetermined response signal) from the communication partner apparatus (calling terminal) is not detected by the signal detecting means, the delay means sends a CI signal (retransmission request signal) requesting retransmission of the ANSam by the signal sending means. The transmission start timing to be delayed is delayed.

As a result, as illustrated in FIG. 2, after the calling terminal sends a CNG signal, the ANSam signal from the called terminal is not detected. Even when a DIS signal having 8 capabilities is received from the called terminal, the called terminal can easily receive the CI, and the CI signal can be surely synchronized with the called terminal. it can. That is, it is possible to prevent a synchronization failure for CI reception from occurring due to the influence of line delay and echo.
Therefore, it is possible to provide a facsimile apparatus that can avoid communication abnormality and can stably continue communication.

[First Embodiment]
Next, a first embodiment of the present invention will be described.
As shown in FIG. 3, a facsimile apparatus according to the first embodiment includes a communication control unit 1 that performs communication control of a facsimile apparatus based on a predetermined program, a modem 2, and an NCU (line control unit) 3. Prepare.

The communication control unit 1 includes a protocol control unit 11, a signal transmission control unit 12 that controls transmission signals by the modem 2, and a signal reception control unit 13 that controls reception signals by the modem 2.
The protocol control unit 11 creates data to be transmitted by the modem 2, adjusts the transmission timing of necessary signals for each signal, and notifies the modem 2 by the signal transmission control unit 12. Further, by analyzing the signal received by the modem 2, the type of the received signal is specified, and signal control based on the information of the corresponding signal is performed.

The modem 2 modulates and demodulates a signal and image data transmitted / received to / from a counterpart facsimile machine via the PSTN.
The NCU 3 is a line control unit (NCU) for connecting to the public telephone network (PSTN), and connects and disconnects the line.

  The facsimile apparatus according to the present embodiment is configured to print image data received by establishing a communication connection in this way by a printer unit (not shown) and read image data of a transmission original by a scanner unit (not shown).

Next, the operation when a call is made by the facsimile apparatus as the first embodiment will be described with reference to FIGS.
In the present embodiment, as shown in FIG. 4, after the calling terminal sends a CNG signal, the ANSam signal from the called terminal is not detected. When a DIS signal with 8 capabilities is received from the called terminal, the sending delay time is increased by a predetermined time each time the DIS signal is received from the called terminal as the CI signal sending timing delay process described above. Delay control is performed as follows.

That is, V.I. When the first DIS signal having 8 capabilities is received from the called terminal (step S1), the delay signal is delayed by a predetermined delay unit time X (200 ms (millisecond) in the example of FIG. 4) (step S2). ), The CI signal is repeatedly sent (step S3).
Even if the CI signal is repeatedly transmitted, if the CI signal is not detected by the called terminal and the second DIS signal is transmitted from the called terminal, the calling terminal has a time twice the delay unit time X (see FIG. The CI signal is repeatedly sent from the timing delayed by 400 ms in the example of 4.

  Thereafter, similarly, when an n-th (n ≧ 1) DIS signal is transmitted from the called terminal, the calling terminal repeats the CI signal from the timing delayed by n times the delay unit time X. Transmission is started and repeated until ANSam is received from the called terminal or until the time of the T1 timer defined in the ITU-T recommendation elapses.

Next, the operation of the facsimile apparatus according to the present embodiment will be described with reference to FIG.
While waiting for reception of the ANSam signal in the call connection state, the modem 2 demodulates the signal input from the NCU 3, the protocol control unit 11 in the communication control unit 1 analyzes the signal, and responds to the analyzed signal. Create a signal to Here, if the analyzed received signal is a DIS signal, the protocol control unit 11 creates a CI signal that requests retransmission of the ANSam signal.
Then, the timing is delayed by the above-described transmission delay time, the CI signal is notified to the modem 2, the modem 2 modulates the signal, and the NCU 3 transmits the signal to the PSTN line.

Here, as described above, when the calling terminal detects the reception of the ANSam signal, the calling terminal sends a CM signal, and when the called terminal detects the CM signal, the JM signal is sent and the JM signal is sent. V. Sending CJ signal when detected by call terminal. Signal exchange according to 8 procedures is executed.
However, V. In step 8, if the incoming call terminal fails to detect the CM signal response to the ANSam signal, 8 Judging that there is no ability, 21 DIS signals are sent out.

  In the present embodiment, the CI signal for requesting retransmission of the ANSam signal to the DIS signal is started to be transmitted at the transmission timing sequentially delayed by the delay unit time X every time the DIS signal is received as described above.

  As a result, according to the first embodiment, even when the calling terminal cannot detect ANSam, the CI signal transmission timing is sequentially delayed, and the called terminal is synchronized for CI signal reception. It can be made easy to take. For this reason, it is possible to provide a facsimile apparatus that can reliably establish a communication connection and ensure communication stability without causing a communication abnormality due to the fact that the called terminal cannot receive the CI signal. .

More specifically, the following reasons can be considered as the reason why the calling terminal cannot detect the ANSam signal.
<1> Due to delay in the exchange <2> Calling terminal manually transmits <3> Due to noise on the line <4> Due to signal collision due to echo of CNG signal <5> Reception level is detected level For less than

  According to the present embodiment, by sequentially delaying the CI signal transmission timing as described above, the influence of delay and echo on the causes of <1> and <4> among the above causes. Thus, it is possible to ensure that the called-side device synchronizes the CI signal. Therefore, it is possible to provide a facsimile apparatus that can avoid communication abnormality and can stably continue communication.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the second embodiment, in addition to the first embodiment described above, the delay time of the signal from the called terminal is measured. As a result, it is considered that it is preferable to secure at least the signal delay time according to the line state, and the transmission start timing of the CI signal from the calling terminal is delayed by the signal delay time from the called terminal. Each time a subsequent DIS signal is received, the delay is further sequentially delayed as described above.
Description of the same parts as those in the first embodiment described above is omitted.

As shown in FIG. 6, the facsimile apparatus according to the second embodiment includes a line delay measurement control unit for measuring a delay time in signal reception in the communication control unit 1 in addition to the configuration of the first embodiment described above. 14.
The line delay measurement control unit 14 determines how much the reception time interval from the end of reception of the signal received from the called terminal to the start of reception of the next signal is delayed with respect to the transmission interval defined in the ITU-T recommendation. Measure. For example, the interval from the end of transmission of the ANSam signal by the called terminal to the start of transmission of the DIS signal is set to 75 ms, but how much the detection time interval at the calling terminal is relative to the time interval defined in this standard Measure how long it is.

  The protocol control unit 11 takes into account the delay time measured by the line delay measurement control unit 14, that is, the signal delay time in which the time interval measured with respect to the time interval defined in the standard is long. The delay time of the signal transmission start timing is determined.

Next, the operation when a call is made by the facsimile apparatus as the second embodiment will be described with reference to FIGS.
In the present embodiment, as shown in FIG. 7, after the calling terminal sends a CNG signal, the ANSam signal from the called terminal is not detected. When a DIS signal with 8 capabilities is received from the called terminal, the line delay measurement control unit 14 measures the time interval from the end of reception of the signal sent before the DIS signal to the start of reception of the DIS signal. . The time interval between the ANSam signal and the DIS signal sent before the DIS signal is set to 75 ms according to the ITU-T recommendation. In the example of FIG. 7, the measured time interval is set to 675 ms. That is, since it is considered that a delay time of 600 ms has occurred, as a CI signal transmission timing delay process by the protocol control unit 11, a CI signal transmission start timing is first set for the signal delay time obtained based on the measurement value. After that, each time a DIS signal is received from the called terminal, delay control is performed so that the transmission delay time is increased by a predetermined time.

  More specifically, V.V. When the first DIS signal having 8 capabilities is received from the called terminal (step S11), the protocol control unit 11 sends the ITU-T to the line delay measurement control unit 14 that measures the time interval between the signals. It is confirmed whether or not a signal delay with respect to the time interval defined in the recommendation has occurred (step S12). If a signal delay has occurred (step S12; Yes), the measured time interval is considered to be a signal delay time longer than the time interval defined in the standard, and the signal delay time (600 ms in the example of FIG. 7). ) From the timing delayed (step S13), the CI signal is repeatedly sent (step S14).

  If the CI signal is not detected by the called terminal even when the CI signal is repeatedly sent and the second DIS signal is transmitted from the called terminal, the calling terminal determines the signal delay time measured in advance as described above. The CI signal is repeatedly transmitted from a timing further delayed by the time obtained by adding the obtained delay unit time X (200 ms in the example of FIG. 7).

  If the CI signal is not detected by the called terminal even when the CI signal is repeatedly transmitted and the third DIS signal is transmitted from the called terminal, the calling terminal determines the signal delay time measured in advance as described above. The CI signal is repeatedly transmitted from a timing further delayed by a time obtained by adding a time twice (400 ms in the example of FIG. 7) twice the delay unit time X.

  Thereafter, similarly, when an n-th (n ≧ 2) DIS signal is transmitted from the called terminal, the calling terminal adds n−1 times the delay unit time X to the measured signal delay time. The CI signal is repeatedly transmitted from the timing delayed by the time, and is repeated until the ANSam from the called terminal is received or until the time of the T1 timer defined in the ITU-T recommendation elapses.

As described above, according to the second embodiment, even when the calling terminal cannot detect ANSam, the CI is only the time obtained by adding n−1 times the delay unit time X to the measured signal delay time. It is possible to delay the signal transmission timing and make it easy for the called terminal to synchronize for receiving the CI signal based on the measured line state.
For this reason, it is possible to provide a facsimile apparatus capable of more reliably establishing a communication connection and ensuring communication stability without causing a communication abnormality due to the fact that the called terminal cannot receive the CI signal. it can.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
In the third embodiment, the measurement of the signal delay time according to the second embodiment described above is performed for the interval between the DIS signal and the next DIS signal.
Description of the same parts as those in the first and second embodiments described above will be omitted.

  In the facsimile apparatus according to the third embodiment, the line delay measurement control unit 14 sends a transmission time interval defined by the ITU-T recommendation from the end of reception of a signal received from the called terminal to the start of reception of the next signal. Measure how far behind the interval. For example, the interval from the end of sending a DIS signal by the called terminal to the start of sending the next DIS signal is determined to be 3 seconds for automatic incoming calls and 4.5 seconds for manual incoming calls. It measures how long the detection time interval is with respect to the time interval specified in this standard.

  The protocol control unit 11 shown in FIG. 6 calculates the delay time measured by the line delay measurement control unit 14, that is, the signal delay time for which the time interval measured with respect to the time interval defined in the standard is long. Based on this, the delay time of the CI signal transmission start timing is determined.

  Next, the operation at the time of making a call by the facsimile apparatus as the third embodiment will be described with reference to FIGS. The example of FIG. 9 shows an example in which the incoming terminal is an automatic incoming call and the interval from the end of sending the DIS signal to the start of sending the next DIS signal is 3 seconds.

  In this embodiment, as shown in FIG. 9, after the calling terminal sends a CNG signal, the ANSam signal from the called terminal is not detected, and V. When a DIS signal with 8 capabilities is received from the called terminal, the line delay measurement control unit 14 measures the time interval from the end of sending the DIS signal to the start of sending the next DIS signal. In the example of FIG. 9, this time interval is set to 3 seconds according to the ITU-T recommendation as described above, but the measured time interval is 3800 ms. That is, since it is considered that a delay time of 800 ms has occurred, the signal delay time obtained based on the measurement value as the CI signal transmission timing delay processing by the protocol control unit 11 at the time of the second DIS signal reception. Only after the CI signal transmission start timing is delayed, a delay control is performed so that the transmission delay time is increased by a predetermined time each time a DIS signal is received from the called terminal.

More specifically, V.V. When the first DIS signal with 8 capabilities is received from the called terminal (step S11), the CI signal is repeatedly transmitted from the timing delayed by a predetermined delay unit time X (200 ms in the example of FIG. 9). To do.
When the second DIS signal is received from the called terminal, the protocol control unit 11 sends a signal for the time interval defined in the ITU-T recommendation to the line delay measurement control unit 14 that measures the time interval between the signal and the signal. It is confirmed whether or not a delay has occurred (step S12). If a signal delay has occurred (step S12; Yes), the measured time interval is considered to be a signal delay time longer than the time interval defined in the standard, and the signal delay time (800 ms in the example of FIG. 9) is considered. ) From the timing delayed (step S13), the CI signal is repeatedly sent (step S14).

  If the CI signal is not detected by the called terminal even when the CI signal is repeatedly transmitted and the third DIS signal is transmitted from the called terminal, the calling terminal determines the signal delay time measured in advance as described above. The CI signal is repeatedly transmitted from a timing further delayed by the time obtained by adding the obtained delay unit time X (200 ms in the example of FIG. 9).

  Thereafter, similarly, when an n-th (n ≧ 3) DIS signal is transmitted from the called terminal, the calling terminal adds n−2 times the delay unit time X to the measured signal delay time. The CI signal is repeatedly transmitted from the timing delayed by the time, and is repeated until the ANSam from the called terminal is received or until the time of the T1 timer defined in the ITU-T recommendation elapses.

As described above, according to the third embodiment, even when the calling terminal cannot detect ANSam, n of the delay unit time X is added to the signal delay time between the measured DIS signal and the DIS signal. The sending timing of the CI signal is delayed by the time added by -2 times, and it is possible to make it easy for the called terminal to synchronize for receiving the CI signal based on the measured line state.
For this reason, it is possible to provide a facsimile apparatus capable of more reliably establishing a communication connection and ensuring communication stability without causing a communication abnormality due to the fact that the called terminal cannot receive the CI signal. it can.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, as a first CI signal transmission timing delay process in the second embodiment, the CI signal transmission delay time is obtained based on the communication history.
Description of the same parts as those in the first and second embodiments described above will be omitted.

As shown in FIG. 10, the facsimile apparatus according to the fourth embodiment includes a communication history control unit 15 that leaves a communication history as data in the communication control unit 1 in addition to the configuration of the first embodiment described above. .
The communication history control unit 15 records the communication result for the destination registered in the one-touch or speed dial as a communication history in a storage unit (not shown) in the apparatus as data associated with the destination information.

As illustrated in FIG. 11, the communication history is obtained by associating the destination information (telephone number), the delay time of the CI signal transmission start timing, and the connection result at the delay time with one-touch dial or speed dial. Composed.
The communication history control unit 15 stores such history information in a storage unit (not shown) to function as a history storage unit.

  Based on this communication history, the protocol control unit 11 determines that the shortest delay time that is a result of successful connection is a delay time that facilitates synchronization of CI signal reception at the called terminal, and determines the first DIS signal. Is determined as the delay time of the CI signal transmission start timing.

Next, an operation when a call is made by the facsimile apparatus as the fourth embodiment will be described with reference to FIG.
The calling terminal of the present embodiment is V. When the first DIS signal having 8 capabilities is received from the called terminal (step S21), the protocol control unit 11 confirms the communication history, and the history information about the delay time of CI signal transmission for the called terminal is obtained. It is confirmed whether it is included (step S22).

  When the history information about the called terminal can be referred to, the CI signal is repeatedly transmitted from the timing delayed by the shortest delay time as a result of the successful connection (step S23).

  Even if this CI signal is repeatedly transmitted, if the CI signal is not detected by the called terminal and the second DIS signal is transmitted from the called terminal, the calling terminal sets the transmission delay time based on the communication history information described above. The CI signal is repeatedly transmitted from a timing further delayed by a time obtained by adding a predetermined delay unit time X (200 ms in the example of the second embodiment).

  Thereafter, similarly, when the n-th DIS signal is transmitted from the called terminal, the calling terminal adds n−1 times the delay unit time X to the transmission delay time based on the communication history information described above. The CI signal is repeatedly transmitted from the delayed timing until the ANSam from the called terminal is received or until the time of the T1 timer defined in the ITU-T recommendation elapses.

As described above, according to the fourth embodiment, even when the calling terminal cannot detect ANSam, n−1 times the delay unit time X is added to the transmission delay time based on the communication history information described above. It is possible to delay the CI signal transmission timing by a certain amount of time so that the called terminal can easily synchronize for receiving the CI signal based on the communication history information.
For this reason, it is possible to provide a facsimile apparatus capable of more reliably establishing a communication connection and ensuring communication stability without causing a communication abnormality due to the fact that the called terminal cannot receive the CI signal. it can.

[About each embodiment]
Each of the above-described embodiments is a preferred embodiment of the present invention, and the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

  For example, according to a communication system in which a plurality of facsimile apparatuses according to the above-described embodiments are connected via a communication line, a communication system capable of reliably establishing communication connection and ensuring communication stability is provided. can do.

  In the above-described embodiment, the facsimile apparatus has been described as communicating with the partner apparatus via the PSTN line. However, the present invention is limited to this configuration as long as it can communicate with other apparatuses via the communication line. For example, the communication may be performed via a VoIP (Voice over IP) line or a LAN (Local Area Network) line. That is, the communication line to be connected may be a line based on various protocols.

Further, by recording the processing procedure for realizing the facsimile apparatus as each of the above-described embodiments on a recording medium as a program, the above-described functions according to each of the embodiments of the present invention are supplied from the recording medium. Thus, the processing can be realized by causing the CPU of the computer constituting the system to perform processing.
In this case, the present invention can be applied even when an information group including a program is supplied to the output device from the above recording medium or from an external recording medium via a network.
That is, the program code itself read from the recording medium realizes the novel function of the present invention, and the recording medium storing the program code and the signal read from the recording medium constitute the present invention. It will be.
As this recording medium, for example, flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, non-volatile A memory card, ROM or the like may be used.

  According to the program according to the present invention, each function in each of the above-described embodiments can be realized in a communication terminal device controlled by the program.

It is a block diagram which shows the structure outline common to each embodiment of this invention. It is a figure which shows notionally the transmission timing delay of CI signal common to each embodiment of this invention. 1 is a block diagram illustrating a configuration example of a facsimile apparatus as a first embodiment of the present invention. It is a figure which shows notionally the transmission timing delay of CI signal by the 1st Embodiment of this invention. It is a flowchart which shows transmission timing delay control of the CI signal by the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the facsimile apparatus as the 2nd Embodiment of this invention. It is a figure which shows notionally the transmission timing delay of CI signal by the 2nd Embodiment of this invention. It is a flowchart which shows transmission timing delay control of the CI signal by the 2nd Embodiment of this invention. It is a figure which shows notionally the transmission timing delay of CI signal by the 3rd Embodiment of this invention. It is a block diagram which shows the structural example of the facsimile apparatus as the 4th Embodiment of this invention. It is a figure which shows the structural example of a communication history. It is a flowchart which shows transmission timing delay control of the CI signal by the 4th Embodiment of this invention. V. of ITU-T. 8 is a flowchart showing a calling operation at a calling terminal according to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication control part 11 Protocol control part 12 Signal transmission control part 13 Signal reception control part 14 Line delay measurement control part 15 Communication history control part 2 Modem 3 NCU

Claims (4)

V. of ITU-T. A communication terminal device capable of executing 8 procedures,
Signal detection means for detecting a signal transmitted from the communication partner device;
A signal transmission means for transmitting a signal;
An ANSam signal from the communication partner apparatus is not detected by the signal detecting means , and V. When receiving a DIS signal (digital identification signal) with 8 capabilities , the signal sending means sends out a retransmission request signal for requesting retransmission of the ANSam signal at a timing delayed from the reception of the DIS signal by a sending delay time. and means, the,
The delay unit, when receiving the nth (n ≧ 1) of the DIS signal, sets the transmission delay time to a time n times a predetermined delay unit time .   A communication system comprising a plurality of communication terminal devices according to claim 1 connected via a communication line. V. of ITU-T. In 8 procedures,
An ANSam signal from the communication partner device is not detected . When a DIS signal (digital identification signal) having 8 capabilities is received, the signal sending means sends out a retransmission request signal for requesting retransmission of the ANSam signal at a timing delayed from the reception of the DIS signal by a sending delay time. With a delay process ,
In the transmission delay step, when the nth (n ≧ 1) of the DIS signal is received, a time n times a predetermined delay unit time is set as the transmission delay time . V. of ITU-T. A program to be executed by a computer of a communication terminal device capable of executing 8 procedures,
An ANSam signal from the communication partner device is not detected . When a DIS signal (digital identification signal) having 8 capabilities is received, the signal sending means sends out a retransmission request signal for requesting retransmission of the ANSam signal at a timing delayed from the reception of the DIS signal by a sending delay time. Let the delay procedure run ,
The transmission delay procedure is characterized in that, when the nth (n ≧ 1) of the DIS signal is received, a time that is n times a predetermined delay unit time is set as the transmission delay time .

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