JPH11112759A - Communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time for communication between facsimile terminals provided with signal V.34 capability by simplifying the detection of ANSam (deformed response tone). SOLUTION: A first communication part 18 executes a procedure correspondingly to recommendation V.8 and V.34. The presence/absence of the V.34 capability of an opposed station is registered to an capability storing part 17. At the time of communicating an opposed station registered to be provided with V.34 capability to the part 17, a signal received first after calling (typically, a 2100 Hz signal) is regarded as ANSam and the part 18 is energized to start communication. When the opposed station is provided with V.34 capability, ANSam is normally supposed to return with respect to the call. Consequently, when the capability of the opposed station is previously known by registered contents in the part 17, the signal received first after calling can be regarded as an ANSam signal. Thereby, a conventional procedure confirming difference between with a CED (called station identification) signal to detect ANSam is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device, and more particularly to ITU-T Recommendation V.1. TECHNICAL FIELD The present invention relates to a communication terminal device that can easily detect an ANSam signal when performing communication by using a modulation method of 34.

[0002]

2. Description of the Related Art ITU-T has 32 (960
28800 bps (33600 as an option) as an extended function of a two-wire full-duplex modem up to 0 bps
b.), which is a modulation method standard for two-wire full-duplex modems up to V.bps. 34 have been recommended. Further, V.I. ITU-34 is a standard that applies to the communication procedures of facsimile machines.
-T Recommendation T. 30 ANNEXF has been defined.

[0003] FIG. 8 is an ITU-T Recommendation T. It is a sequence diagram of a basic communication procedure of 30 ANNEXF. The procedure at the start of communication includes network interaction (phase 1) for recognizing the functions and the like of the partner terminal, and line probing (line probing for grasping the state of the communication line set between the calling station and the answering station). Phase 2) Primary channel equalizer training for training the equalizer built in the modem 12 (Phase 3), exchange of performance information of the modem 12, etc., setting of the data signal speed, etc. T. Modem parameter exchange (phase 4), exchange of control channel data prior to transmission of image information, etc. Each phase includes 30 facsimile handshakes (phase 5) and primary channel resynchronization (phase 6) for resynchronizing the primary channel prior to image information transmission.

In the network interaction,
Recommendation V. 8 are performed. The calling station detects the modified response tone (ANSam) transmitted by the called station, and the called station determines whether the called station has V.30. 34, the calling menu (CM) and the common menu (J
M), and after line probing,
V. It is stipulated that the procedure moves to 34 procedures.

[0005]

SUMMARY OF THE INVENTION When communication is performed using the 34 modulation scheme, there are the following problems. The ANSam signal is a signal obtained by applying a 15 Hz amplitude modulation to a 2100 Hz sine wave. On the other hand, the slow called station identification (CED) is a 2100 Hz sine wave. Therefore, the calling station receives the ANSam signal when detecting the reception of the 2100 Hz signal and the amplitude modulation of 15 Hz.
When the amplitude modulation of 15 Hz is not detected only by receiving the Hz signal, it is determined that the CED signal is received.

However, because of poor line conditions, ANSam
The amplitude modulation of the signal can take a long time to detect. Then, it becomes difficult to discriminate between the CED signal and the ANSam signal, and the ANSam signal is transmitted for a predetermined time (5 seconds ± 5 seconds).
The ANSam signal may not be determined within one second).
If the ANSam signal cannot be detected, There is a problem in that the eight procedures cannot be started and the communication time becomes longer if the determination requires time.

[0007] The present invention solves the above-mentioned problems and provides an ANSa
An object of the present invention is to provide a communication terminal device capable of shortening a communication time by shortening a time required for detecting an m signal.

[0008]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems and achieving the object is described in ITU-T Recommendation V.3. 8 and V.I. A communication means for executing a communication procedure according to 34;
V. of the partner station Capability storage means for registering the presence or absence of the capability, and V.34 in the capability storage means. The first feature is that in communication with a partner station registered as having 34 capabilities, a signal received first after calling is regarded as an ANSam signal and the communication means is activated.

If the other station has the V, 34 capability, an ANSam signal should normally be returned for a call. Therefore, according to the first feature, the signal received first after calling is regarded as an ANSam signal. 8 and proceed to V.8. Communication is started using the 34 modulation method.

Further, according to the present invention, the capability storage means includes a V.A. 34
If no capability is registered or the capability is unknown, the V.I. 34 capability statement or ANSam
In response to the detection of the signal, the communication means starts communication, and when the communication ends normally, the V.A. 34, while the ability storage means stores V.34. In the case where communication is started by the communication means and an error is terminated even though it is registered as having capability, the V.34 of the partner station is stored in the capacity storage means. A second feature is that the system is configured to register 34 no capability.

[0011] According to the second feature, the V.R. V.34 capability or V.34 of the initial identification signal. When the partner station detects V.34 capability declaration or ANSam signal detection, The communication is started upon recognition that the machine is a 34-capacity machine, and based on the result, the contents of the capability storage means are rewritten to a state in accordance with the actual situation.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is an overall configuration diagram of a communication terminal device according to an embodiment of the present invention. Here, a facsimile machine is assumed. Facsimile machine 10
Numeral 0 denotes a CPU 1 for controlling the entire facsimile apparatus 100, a RAM 2 as a work area used when executing a control program, a display and operation switches for operating the facsimile apparatus 100, and a display screen showing processing results in the CPU 1. And the like, an operation display device 3 provided with the like, a reading device 4 for reading a transmission original, a printing device 5 for printing and outputting received image information, and image processing for performing surface image processing such as encoding, decoding, enlargement, and reduction. Device 6, an image storage device 7 for storing image information to be transmitted or received, a system control program storage unit 8 including a ROM storing a program for controlling the entire facsimile device 100, a digital network (for example, ISDN). And a ROM storing a program for controlling communication (for example, G4) suitable for the network. A digital communication control program storage unit 9, an analog communication control program storage unit 10 including a ROM storing a program for controlling communication suitable for an analog network (for example, G3), and connecting the facsimile apparatus 100 to the digital network. Network controller 11 for connecting the facsimile machine 100 to an analog network, and line switching control for connecting a plurality of external line interfaces and a plurality of internal communication circuits by switching. Apparatus 1
5 which are interconnected by a system bus 14.

The digital communication control program storage unit 9 is directly connected to the line switching control unit 15 and the analog communication control program storage unit 10 is provided with a modem (modulator / demodulator) 12 having a low-speed mode and a high-speed mode. It is mutually connected with the line switching control device 15 through the. The line switching control device 15 is also connected to each of the digital network control device 11 and the analog network control device 13. Further, the analog communication control program storage unit 10
And the analog network controller 13 are mutually connected.

The facsimile apparatus 100 can be connected to a digital network or an analog network. However, when the facsimile apparatus 100 is connected only to an analog network, the digital communication control program storage section 9 and the digital network control apparatus 11 are connected. When only the digital network is connected, the analog communication control program storage unit 10, the modem 12, and the analog network control device 13 can be omitted.

In this embodiment, the facsimile apparatus 100
In addition, V.E. A capability list describing the presence or absence of the 34 capabilities is provided, and the communication procedure can be simplified by referring to the capability list. FIG. 3 shows an example of the destination data list. 34 describes a capability list (capability list). In FIG. Data "1" is set for a destination having 34 capabilities, and "0" is set for a destination having no capability. This capability list is preferably rewritable as described below.

Next, a communication procedure using the capability table will be described. In the flowchart of FIG. 4, a calling operation is performed in step S1. In step S2, the V.V. Search the 34 capability list. In step S3, based on the search result, the partner station determines that V. It is determined whether or not the device has the 34 capability. If the partner station is V. If it has the capacity of 34, the process proceeds to step S4, and it is determined whether a 2100 Hz signal is detected. If the signal of 2100 Hz is detected, the process proceeds to step S5, and the transmission of the CM signal is started. The partner station is V. 2100 Hz since it has already been determined in step S3 that it has
This is because it is possible to judge that the received signal is the 2100 Hz component of the ANSam signal without looking at the presence / absence of the amplitude modulation only by detecting the signal of (1). After starting transmission of the CM signal, the process proceeds to step S6, and 8 through the V.8 procedure. Communication is performed in 34 steps.

On the other hand, in step S3, V.V. If there is no description in the capability list for the 34 capabilities, or if "0" is described in the capability list, the process proceeds to step S7, and it is determined whether a 2100 Hz signal is detected as in step S4. If the signal of 2100 Hz is detected, the process proceeds to step S8, and it is determined whether or not the amplitude modulation of 15 Hz is detected. If a 15-Hz modulated signal is detected, the process proceeds to step S5. This is because it can be determined that the ANSam signal has been detected by detecting the 15 Hz modulation signal.

If a 15 Hz modulated signal is not detected, it is determined that a CED signal of only 2100 Hz has been received, and the flow advances to step S9 to wait for a low speed command of 300 bps. After the CED signal, the low-speed N
This is because reception of the SF / DIS signal is scheduled. DI
If the DIS signal has been received, in step S10, the DIS signal is analyzed and the V.S. 8 Judge whether there is an ability declaration. V. If an 8 capability declaration is detected, step S11
The transmission of the calling indication signal (CI) is started. CI
After starting transmission of the signal, the process proceeds to step S7 to receive the ANSam signal. From the initial identification signal, V.V. 8 After detecting the capability declaration and starting transmission of the CI signal, ANSA
A series of procedures for waiting for reception of the m. This is a predetermined process for shifting to the 34th procedure. V. DIS signal If no capability declaration is made, the process proceeds to step S12, and the normal procedure, that is, the ITU-T Recommendation T.8. Communication is performed at 30.

In step S13 of FIG. 5, it is determined whether or not the communication has been normally completed. If the communication has been normally completed, the process proceeds to step S14. In step S14, the destination V.P. 34 Information about the presence or absence of the capability is written in the capability list, and the destination data list is updated. That is, if it is determined in step S13 that the process is normal via step S12, “0” is described in the capability list. If it is determined that the process is normal in step S13 via step S6, “1” is stored in the capability list. Describe. During the normal termination in step S13 via step S6, it was once determined in step S3 that "there was no V.34 capability" or "unknown". V.34 capability. This includes the case where the process is normally completed in 34 procedures.

If it is determined in step S13 that the communication has not been completed normally, "0" is described in the destination capability list for the call and the destination data list is updated. That is, if the communication does not end normally despite the determination in step S4, the destination facsimile apparatus sets the V.E.M. Since there is a possibility that the terminal has been replaced with a terminal having no V.34 capability, "V.34 no capability" is described and V.34 will be used in the next communication. This is because communication is started assuming that there is no capability. Note that, in step S10, V.V. 8 without ability. When the communication is performed in step 30, “0” is described in the capability list regardless of whether the communication is normally completed or ended in error.

As described above, in the present embodiment, the V.V. Since the communication is started with a capacity of 34, the determination of the ANSam signal and the CED signal does not require a long time.

In the above example, the capability list is provided in association with the speed dial list, but the capability list is not limited to such a format. For example, in general, a facsimile apparatus or the like has a function of storing a past communication result and a communication partner in association with each other as a communication history. Therefore, using this communication history, in the communication result column, the V.D. 34 Describe the ability. V. FIG. 6 shows an example of a communication history describing 34 capabilities.
It was shown to.

FIG. 7 shows a main part of the processing when the communication history is used. In FIG. 7, after the calling operation is performed in step S20, in step S21, it is determined whether or not the dial number of the called destination is in the communication history. And
If the corresponding dial number is not detected, 2100
Hz signal reception waiting processing (step S
7). On the other hand, if the dial number of the destination is detected in the communication history, the process proceeds to step S22, and V.V. Search 34 capabilities. Then, V. The process proceeds to the process of determining the presence or absence of the 34 capability (step S3).

FIG. 1 is a functional block diagram of a main part of the facsimile apparatus of the present embodiment. In FIG.
Are the first receiving units 16a and 1
The second receiver 16b detects a 5 Hz amplitude modulation signal. The capability storage unit 17 stores the V.V. 34 capabilities are registered. The first communication unit 18 is a V. 8 and V.I. 34 communication means,
Is T. It is a communication means having 30 capabilities. Ability rewriting part 2
Reference numeral 0 denotes a description unit that updates the capability storage unit 17 according to the result of the communication.

When a call is made from the calling unit 21 to the partner station, the capability discrimination unit 22 stores the V.V. 8 Search for ability. Based on the search result, at least 210 out of the first and second receiving units 16a and 16b
The first receiving unit 16a that receives the 0 Hz signal is enabled.
That is, V.P. In the case where the registration indicating that there is the capability is made, only the first receiving unit 16a is made effective, and If the registration has been made that there is no capability, the first and second receiving units 16a and 16b are both enabled.

The ANSam discriminating unit 23 determines that the incoming signal is AN
Sam signal or a signal regarded as such, or V.Sam signal. 8
The first communication unit 18 is energized in response to the capability declaration, and the ANSam signal or V.A. When the capability declaration is not detected, the second communication unit 19 is activated. That is, V. Receiving unit 1 when registered as capable of 34
When 6 is enabled and a 2100 Hz signal is detected, it is regarded that the ANSam signal has been received and the first communication unit 18 is activated. V. 34, if registered as no capability, the receiver 16 is enabled and the 2100 Hz signal and 15
When the Hz signal is detected, it is determined that the ANSam signal has been received, and the first communication unit 18 is activated.

Further, the DIS analysis unit 24 outputs In the case where it is registered as having no capability and only the 2100 Hz signal is received, when the DIS signal is received, the V.34 signal is output. 8 Judge whether there is an ability declaration. And V. If the capability declaration is made, the first communication unit 18 is activated, and If there is no 8 capability declaration, the second communication unit 19 is activated.

In this embodiment, the destination is V. ANS with the arrival of 2100Hz signal when there is 34 capability
The subsequent processing was executed assuming that the am signal was received. However, if the destination facsimile machine is a V. If it has the capability, the ANSam signal should be transmitted first in response to the call, so that the V.34 signal immediately follows the first incoming call after the call. The process may proceed assuming that the user has 34 capabilities.

Although the present embodiment has been described with respect to a facsimile apparatus, the present invention is not limited to a communication terminal apparatus for transmitting image information. As a matter of course, the present invention can be widely applied to a communication terminal device that performs data communication and information communication according to the 34 modulation scheme.

[0030]

As is apparent from the above description, according to the present invention, if the partner station has the V, 34 capability, an ANSam signal should normally be returned for an outgoing call. In view of this, the signal received first after calling is regarded as an ANSam signal and 8 procedure. The communication is started by the 34 modulation method. Therefore, the CED signal and A
No time is required for discrimination from the NSam signal, and the communication time can be shortened as a whole.

Further, according to the present invention, the capability storage means in which the capabilities of the partner station are registered can be automatically updated to match the actual situation based on the result of the communication. The effect of shortening the communication time can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating main functions of a facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an overall configuration of a facsimile apparatus according to an embodiment of the present invention.

FIG. 3 shows a V.D. 34 is a table describing the presence / absence of 34 capabilities.

FIG. 4 is a flowchart (part 1) illustrating an operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. 5 is a flowchart (part 2) illustrating an operation of the facsimile apparatus according to the embodiment of the present invention.

FIG. It is an example of a communication history including the presence / absence of 34 capabilities.

FIG. 7 is a flowchart showing a main part of the operation of the facsimile apparatus according to the modification.

FIG. 8: ITU-T Recommendation T. It is a sequence diagram of a basic communication procedure of 30 ANNEXF.

[Explanation of symbols]

1 ... CPU, 8 ... System control program storage unit,
12: modem 16a: first receiving unit 16b: second
Receiving unit, 17: ability storage unit, 18: first communication unit, 1
9: Second communication unit

Continued on the front page (72) Inventor Yoshiaki Tezuka 3-7-1, Fuuchi, Iwatsuki City, Saitama Prefecture Inside Fuji Xerox Co., Ltd. (72) Inventor Hiroaki Sakaki 3-7-1, Fuuchi, Iwatsuki City, Saitama Prefecture Fuji Xerox Inside the corporation

Claims (6)

[Claims] 1. An ITU-T Recommendation V. 8 and V.I. Communication means for executing a communication procedure conforming to V.34, and V.34 of the partner station. Capability storage means for registering the presence / absence of the ability; 34. A communication terminal, comprising: communication start means for energizing the communication means by regarding a signal received first after a call as an ANSam signal in communication with a partner station registered as having capability. apparatus. 2. An ITU-T Recommendation V. 8 and V.I. Communication means for executing a communication procedure conforming to V.34, and V.34 of the partner station. 34, a capability storage means for registering the presence or absence of the capability, a signal detection means capable of detecting a 2100 Hz signal, 2100H detected after calling in communication with the partner station registered as having 34 capability
a communication start unit for energizing the communication unit by regarding the z signal as an ANSam signal. 3. The capability storage means stores the V.V. of the partner station in association with the speed dial of the partner station. 3. The communication terminal device according to claim 1, wherein the communication terminal device is a speed dial list in which the presence or absence of 34 capabilities is registered. 4. The communication device according to claim 1, wherein said capability storage means stores a V.V. 3. A communication history storage unit for registering whether or not there is a capacity of 34.
The communication terminal device according to claim 1. 5. An end detecting means for detecting whether the communication has been normally completed or an error has been completed. 34 capability is not stored or In communication with the partner station that has been stored as having no capability, V.34 from the initial identification signal. Capability detection means for detecting a declaration of the capability. And communication start means for energizing the communication means when detecting the declaration of the capability, and when the end detection means detects the normal end, the V.34 of the partner station is stored in the capacity storage means. 5. A capability description means for registering 34 capabilities.
The communication terminal device according to any one of the above. 6. An end detecting means for detecting whether communication has ended normally or an error, and V.V. In communication with a partner station registered as having capability, if the end detecting means detects an error end, the V.34 of the partner station is stored in the capability storage means. The communication terminal device according to any one of claims 1 to 4, further comprising a capability description means for registering the absence of 34 capabilities.