JP3314637B2 - Communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, ITU-T
(International Telecommunication Union-Telecommuni
cation Sector). The present invention relates to a communication device such as a facsimile device capable of performing communication in accordance with a full-duplex communication system such as E.8.

[0002]

2. Description of the Related Art In recent years, with the advance of information society, it has become necessary to send a large amount of document data at a high transmission speed. In order to respond to such a request, ITU-T Recommendation V. 34
There has been proposed a facsimile apparatus capable of performing communication in conformity with the standard. This Recommendation V. In the communication by the C.34, since data can be transmitted at a maximum speed of 33600 bps, it is a very effective communication procedure for efficiently transmitting a large amount of data in a short time. And this V. In order to implement the method described in ITU-T Recommendation V.34, In step 8, an exchange with a communication partner is performed to determine a usable modulation method and the like.

[0003] V.8. 34 is possible, 34, data can be transmitted at high speed. Also,
The communication partner is V. 34 is not provided, for example,
The facsimile procedure is performed according to 30.

[0004] This Recommendation V. In the communication by No. 8, as shown in FIG. 4, after the line is connected, the called side sends an ANSam signal (modified response tone signal) to the calling side. When the calling side detects the ANSam signal from the called side,
After transmitting the silent period Te, a CM signal (calling menu signal) is transmitted to notify the called party of its own function, for example, information such as whether it is a facsimile machine, a telephone, or a data modem. To be displayed. On the other hand, the called party
If a CM signal is detected during transmission of the Sam signal, a JM signal (common menu signal) indicating its function is transmitted to the calling side in response to the CM signal. Also, these CM signals and J
The modulation mode between the calling side and the called side is determined by exchanging the M signal.

[0005] When the calling side detects the JM signal,
A CJ signal (CM terminator signal) indicating the confirmation and the end of the CM signal is transmitted, and If it has the C.34 function, after the transmission of the CJ signal is completed, the other party will receive the VJ signal. If it is equipped with the V.34 function, it outputs 75 ± 5 ms of silence, 34
Execute the communication procedure. When the called side detects the CJ signal, it terminates the transmission of the JM signal, and transmits 75 ± 5 ms of silence. 34 The communication procedure is executed.

As described above, V.I. In the 8 communication, the communication operation mode between the calling side and the called side is automatically determined to be an appropriate mode by exchanging the CM signal, the JM signal, and the like. For this reason, V. 8 communication is a very effective communication procedure for determining a communication operation mode between a calling side and a called side in recent years in which various communication devices are used.

[0007]

By the way, on the calling side, the V.40 is used. 34, which is executed prior to 8 fails (for example, if the calling party transmits the CI signal and the called party cannot detect the CI signal due to a transmission error or the like and the called party cannot detect the CI signal, the ANSam signal indicates a transmission error. And the like, and when the ANSam signal and the JM signal are transmitted from the called side with a delay, etc.). The procedure is shifted to 30 procedures. In such a case, both the calling side and the called side have the V.30. Even with the 34 functions, the functions cannot be exhibited, and the functions are wasted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible for a calling party to use V.264. 8 functions, V.8. An object of the present invention is to provide a communication device capable of reliably performing communication in eight procedures.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided communication means for performing communication in accordance with a first communication method and a second communication method,
The communication means is ANSam of the first communication system from the called side.
When the transmission of the CM signal of the first communication method is not detected after the start of the transmission of the CM signal of the first communication method, the transmission of the CM signal of the first communication method is stopped, and the transmission of the CM signal of the second communication method is stopped. When a DIS signal is detected, and when information indicating that communication of the first communication method is possible is detected in the DIS signal, a CI signal of the first communication method is transmitted.

According to a second aspect of the present invention, there is provided communication means for performing communication in accordance with the first communication method and the second communication method, and the communication means comprises a first communication method A from the called side.
After starting transmission of the CM signal of the first communication method in response to the NSam signal, both the JM signal of the first communication method and the DIS signal of the second communication method are detected, and the DIS signal of the second communication method is detected. In this case, when information that enables communication of the first communication method is detected in the DIS signal, a CI signal of the first communication method is transmitted.

According to the third aspect of the present invention, there is provided communication means for performing communication in accordance with the first communication method and the second communication method, and the communication means is provided with A of the first communication method from the called side.
After starting transmission of the CM signal of the first communication method in response to the NSam signal, a JM signal of the first communication method is detected for a predetermined time,
If the JM signal of the first communication method is not detected, the transmission of the CM signal of the first communication method is stopped, and the DM signal of the second communication method is stopped.
When the IS signal is detected and the DIS signal of the second communication method is detected, when information indicating that the communication of the first communication method is possible is detected in the DIS signal, the CI signal of the first communication method is transmitted.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the first communication is performed based on detection of information capable of performing communication in the first communication mode. After starting transmission of the CI signal of the system, the carrier frequency of the ANSam signal of the first communication system is detected by a frequency filter.

Therefore, any one of claims 1 to 3
According to the invention described in the paragraph, after the transmission of the CM signal of the first communication method is started in response to the ANSam signal of the first communication method from the called side, even if the JM signal of the first communication method cannot be detected, , A DIS signal of the second communication method is detected. The first signal is included in the detected DIS signal of the second communication method.
If information that allows communication using the communication method is detected, the first
Communication using the communication method is enabled.

According to the second aspect of the present invention, when both the JM signal of the first communication method and the DIS signal of the second communication method are detected, even if the JM signal of the first communication method cannot be detected, A DIS signal of the second communication method is detected.
Then, if information indicating that communication of the first communication method is possible is detected in the detected DIS signal of the second communication method,
Communication using the first communication method is enabled.

According to the third aspect of the present invention, since the JM signal of the first communication system from the called side is detected until a predetermined time elapses, the JM signal of the first communication system from the called side is detected. JM
Even if the signal has a delay, the JM signal can be reliably detected. Therefore, it is possible to reliably detect the JM signal of the first communication method from the called side without dropping it, and execute communication according to the first communication method. According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the called party confirms that the communication of the first communication method is possible. After that, it is possible to determine what the signal is by merely detecting the carrier frequency of the signal from the called side.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a facsimile machine F will be described below with reference to the drawings.

FIG. 1 shows a circuit configuration of a facsimile apparatus F of this embodiment. CPU (Central Processing Uni
t) 1 includes a ROM (Read Only Memory) 2 that stores a program for controlling the operation of the entire apparatus and a RAM (Random Access Memory) that temporarily stores various information.
ry) 3 is connected.

The NCU (Network Control Unit) 4 has functions of controlling connection with the telephone line L, transmitting dial pulses corresponding to the fax number of the other party, and detecting an incoming call. The modem 5 constituting the communication means modulates and demodulates transmission / reception data. Further, in the present embodiment, the modem 5 is used for the G in facsimile communication.
3 functions for enabling communication procedures; 8 and V.I. 3
V.4 is provided with a function for enabling a communication procedure, and constitutes communication means for detecting a 1750 Hz signal carrier described later transmitted from the called side. 2
A one-carrier detection unit 5a is provided. V. The 21 carrier detection unit 5a detects a V.21 carrier signal having a center frequency of 1750 Hz. A filter for 21ch1 (H) is provided. Further, the modem 5 includes a 2100 Hz filter unit 5b that constitutes a communication unit for detecting a signal carrier having a center frequency of 2100 Hz.

The reading section 6 reads an image on a document. The recording unit 7 performs printing on recording paper based on the received image data, the image data read by the reading unit 6, and the like. Operation unit 8
Is provided with various operation keys such as a dial key for inputting a telephone number and the like and a start key for starting a facsimile communication operation. The display unit 9 is for displaying various information.

Next, the communication operation when the facsimile machine F of the present embodiment becomes the calling side will be described with reference to the flowcharts shown in FIGS. Note that this operation is R
Based on the program stored in OM2, CPU 1
Is executed by

As shown in FIG. 2, when there is a transmission request (S1), a call is made (S2). When the telephone line L is connected to the called party, the modem 5 is connected to After being set to 8 (S3), a CNG signal is transmitted (S4).

Next, it is determined whether a CED signal from the called side has been detected (S5). If the CED signal is detected, the called party is notified of the T.CED signal. It is determined that only the T.30 function is provided, and T.30 as the second communication method is used. 30 procedures are executed (S6). If no CED signal is detected, V.21 carrier detector 5a. 21ch2
A filter for (H) is set (S7). Next, 175
It is determined whether a signal carrier near 0 Hz is detected (S8). If it is determined that the signal may be a DIS signal and detected, the process proceeds to S16 described later.

If no signal carrier near 1750 Hz is detected, it is determined whether an ANSam signal has been detected (S9). If the ANSam signal is not detected, the process returns to S5. If the ANSam signal is detected, the called party sets V. It is judged that it has eight functions,
Transmission of the CM signal is started (S10).

Subsequently, it is determined whether a JM signal transmitted from the called side has been detected (S11). If a JM signal is detected, CJ is used as a procedure signal of the JM signal.
A signal is sent (S12), and 34 procedures are executed (S13).

If no JM signal is detected in S11, it is determined whether a predetermined time (for example, 4 seconds) has elapsed (S14). If the predetermined time has not elapsed, the process returns to S11 and waits for the detection of the JM signal. When the predetermined time has elapsed, the transmission of the CM signal is stopped (S15), and the process proceeds to S16.

In S16, the modem 5 transmits the V. 21 (S16). Next, the DI sent from the called party
It is determined whether an S signal has been detected (S17). D
If no IS signal is detected, It is determined whether a predetermined time (for example, 30 seconds) has elapsed from the setting of 21 (S18). If the predetermined time has not elapsed, the flow returns to S17 to detect the DIS signal. If the predetermined time has elapsed, the line is released (S19), and this process ends.

In step S17, when the DIS signal is detected, the called party sends an HDLC (High level Data Li
nk Control)
(Facsimile Information field) in the sixth bit.
It is determined whether information indicating eight functions is included (S20). V. If the information indicating the T.8 function is not included, Communication is performed according to the 30 procedures (S2).
1). V. If information indicating the 8 functions is included, C
Transmission of the I signal is started (S22).

Next, detection of a signal carrier near 2100 Hz is started by the 2100 Hz filter unit 5b (S2).
3). Subsequently, it is determined whether a signal carrier near 2100 Hz has been detected (S24). If a signal carrier near 2100 Hz is detected, it is determined that the signal is an ANSam signal, and the transmission of the CI signal is stopped (S2).
5) Returning to S10, transmission of the CM signal is started. If the signal carrier near 2100 Hz is not detected, it is determined whether a predetermined time has elapsed since the detection of the signal carrier near 2100 Hz was started in S23 (S26). If the predetermined time has not elapsed, the flow returns to S24, and it is determined whether a signal carrier near 2100 Hz is detected. If the predetermined time has elapsed, the line is released (S27), and this process ends.

As described above, according to the present embodiment, the following operations and effects can be obtained. (1) If the called party is V. 8 If you have a communication function,
After the line connection, the ANSam signal is transmitted from the called side in response to the transmission of the CNG signal. Based on the detection of the ANSam signal, V.S.M. 8 communication procedures can be executed without any trouble. For this reason, V. 8 functions, and V.8. 34 function, the V.34 function is further provided. High-speed communication by 34 functions becomes possible.

Further, in response to the ANSam signal from the called side,
After the transmission of the CM signal is started, a JM signal from the called side is detected for a predetermined time. Therefore, even if the JM signal from the called side has a delay, the JM signal is reliably detected and the V.M. Eight procedures can be performed. Also,
If the JM signal is not detected within a predetermined time, the transmission of the CM signal is stopped and the modem 5 transmits the V.JM signal. 21 is set. Then, when the DIS signal is detected, V.D. If information indicating the function is stored, the V.8 function is stored. Return to step 8. Thus, V. 21 even if it is set to V.21. 8 is confirmed to have the V.8 function. Since the procedure returns to the eight-step procedure, communication using a communication system with higher capability becomes possible.

(2) As shown in S5 to S9 in FIG.
T. 30 procedure signal and V.30. Since both the eight procedure signals are detected, no matter which procedure signal is transmitted from the called side, it can be detected without fail and communication is not disabled.

(3) In S24 of FIG. 3, when a signal of 2100 Hz is detected, it is determined to be an ANSam signal. In other words, before the call from S24, the DIS
Based on the signal, the called party may It has been confirmed that it has eight functions. Therefore, in S24, if the signal is 2100 Hz, the signal can be determined to be the ANSam signal. The ANSam signal is transmitted by an amplitude modulation method, but since this modulation method is easily affected by the line condition, if the line condition is poor, the ANSam signal may not be received normally. However, simply filter at 2100Hz
Is detected, it is difficult to be affected by the line condition. Therefore, whether or not the ANSam signal is detected can be accurately determined regardless of the line condition.

The above embodiment may be modified as follows. Even in such a case, at least the same operations and effects as those of the above embodiment can be obtained. (A) The processing between S11 and S14 in FIG. 2 is changed to the processing in S11, S30 and S31 in the flowchart shown in FIG. In this flowchart, if no JM signal is detected in S11, the V.V. V.21 carrier detector 5a. A filter for 21ch2 (H) is set (S3
0). Next, it is determined whether a signal carrier near 1750 Hz has been detected (S31). If a signal carrier near 1750 Hz is detected, the signal
It is determined that the signal may be the S signal, and the process shifts to S15. That is, in this case, T.P. 30 procedure signal and V.30. Both the eight procedure signals are detected. Therefore, which procedure signal is transmitted from the called side can be detected more reliably, and communication is not disabled.

(B) The communication terminal device may be embodied by a personal computer other than the facsimile device. (C) V. 8 procedure signal and T.8 signal Methods for detecting both of the 30 procedure signals include a method of detecting both signals simultaneously and a method of detecting both signals alternately in a time-division manner.

Further, technical ideas other than the claims grasped from the above embodiment will be described below together with their effects. [1] In the method for performing communication according to the first communication method and the second communication method, after starting transmission of the procedure signal of the first communication method in response to the procedure signal of the first communication method from the called side,
The procedure signal of the first communication method is detected for a predetermined time. If the procedure signal of the first communication method is not detected, the transmission of the procedure signal of the first communication method is stopped, and the procedure signal of the second communication method is detected. Communication method to be used.

[2] In the method for performing communication in accordance with the first communication method and the second communication method, after starting transmission of the procedure signal of the first communication method in response to the procedure signal of the first communication method from the called side. When both the procedure signals of the first and second communication methods are detected and the procedure signal of the second communication method is detected, the first signal is transmitted when information that allows communication of the first communication method is detected in the procedure signal. A communication method for transmitting a procedure signal of a communication method.

[3] In the method for performing communication according to the first communication method and the second communication method, both the procedure signals of the first and second communication methods from the called side are detected, and the procedure signal of the first communication method is detected. Is detected, the procedure signal of the first communication method is started to be transmitted, and then the procedure signal of the first communication method is detected for a predetermined time. If the procedure signal of the first communication method is not detected, the first communication method is detected. Is stopped, the procedure signal of the second communication method is detected, and when the procedure signal of the second communication method is detected, information indicating that communication of the first communication method is possible is included in the procedure signal. A communication method for transmitting a procedure signal of the first communication method upon detection.

[4] After starting the transmission of the procedure signal of the first communication method based on the detection of the information enabling the communication of the first communication method, the carrier frequency of the procedure signal of the first communication method is detected by the frequency filter. The communication method according to the above [2] or [3].

[5] The first communication method is based on 8 and the second communication scheme is T.8. The communication method according to any one of claims 1 to 4, wherein the communication method is 30. [6] V.I. 8 and T.I. 30 in a method for communicating according to V.30. 8 for the AM Sam signal.
8 after starting the transmission of the CM signal of V.8. 8 is detected for a predetermined time, and when no JM signal is detected,
The transmission of the CM signal is stopped. A communication method for detecting 30 DIS signals.

[7] V. 8 and T.I. 30 in a method for communicating according to V.30. 8 for the AM Sam signal. 8 after starting the transmission of the CM signal of V.8. 8
JM signal and T. Detecting both of the 30 DIS signals,
When a DIS signal is detected, V.D. 8
When the information that enables the communication of V. is detected, V.P. 8. A communication method for transmitting the CI signal of No. 8.

[8] V. 8 and T.I. 30 in a method for communicating according to V.30. 8 and the T.8 ANSam signal. 30 when both DIS signals are detected and the ANSam signal is detected. 8 after starting the transmission of the CM signal of V.8. 8 is detected for a predetermined time, and if no JM signal is detected, the transmission of the CM signal is stopped and the
When the S signal is detected and the DIS signal is detected,
V.S in the S signal. 8 is detected when information enabling communication is detected. 8. A communication method for transmitting the CI signal of No. 8.

[9] V. The communication method according to [3] or [8], wherein after starting transmission of the CI signal based on the detection of the information capable of communication of No. 8, the carrier frequency of the ANSam signal is detected by a frequency filter.

Even in the case of [1] to [9], the same effect as in the above embodiment can be obtained.

[0044]

Since the present invention is configured as described above, it has the following effects. According to the invention described in any one of claims 1 to 3, D in the second communication method
When the information that enables the communication of the first communication method is detected in the IS signal, the communication returns to the communication of the first communication method. Therefore, when the first communication method has higher capability, the first communication having higher capability is performed. Communication can be performed with priority given to the method.

According to the second aspect of the present invention, when both the JM signal of the first communication system and the DIS signal of the second communication system are detected, even if the JM signal of the first communication system cannot be detected, If information enabling communication of the first communication method is detected in the detected DIS signal of the second communication method,
Communication using the first communication method is enabled. For this reason, when the first communication method has higher capability, communication can be performed with priority given to the first communication method having higher capability.

According to the third aspect of the present invention, even if there is a delay in the JM signal of the first communication system from the called side, the JM signal of the first communication system is delayed.
The M signal can be reliably detected, and communication is not disabled. In addition, J of the first communication system from the called side
The communication according to the first communication method can be executed by reliably detecting the M signal without dropping it. According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, it is confirmed that the called side can perform communication of the first communication method. After that, it is possible to determine what the signal is by merely detecting the carrier frequency of the signal from the called side. Therefore, it is possible to accurately determine what the signal is, regardless of the line condition.

[Brief description of the drawings]

FIG. 1 is a block diagram of a facsimile apparatus according to one embodiment.

FIG. 2 is a flowchart showing a communication operation of the facsimile apparatus.

FIG. 3 is a flowchart showing a communication operation of the facsimile apparatus.

FIG. Explanatory drawing which shows the communication operation in case of eight machines.

FIG. 5 is a flowchart showing another embodiment.

[Explanation of symbols]

1. CPU, 2 ROM, 3 RAM, 5 modem constituting communication means, 5a configuring V. communication means 21 carrier detector, 5b: 2100 Hz constituting communication means
Filter section.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04N 1/32-1/36 H04N 1/42-1/44

Claims (4)

(57) [Claims] A communication means for performing communication in accordance with a first communication method and a second communication method, wherein the communication means responds to an ANSam signal of the first communication method from a called party by a CM signal of the first communication method. If the JM signal of the first communication method is not detected after the transmission of the first communication method is started, the transmission of the CM signal of the first communication method is stopped, the DIS signal of the second communication method is detected, and the DIS signal of the second communication method is detected. A communication device for transmitting a CI signal of the first communication method when detecting information that enables communication of the first communication method. 2. A communication means for performing communication according to a first communication method and a second communication method, wherein the communication means responds to an ANSam signal of the first communication method from a called party by a CM signal of the first communication method. , The JM signal of the first communication method and the DIS signal of the second communication method are both detected,
A communication device that, when detecting a DIS signal of a communication method, detects information indicating that communication of the first communication method is possible in the DIS signal, and transmits a CI signal of the first communication method. 3. A communication means for performing communication in accordance with a first communication method and a second communication method, wherein the communication means responds to a first communication method ANSam signal from a called party by a first communication method CM signal. , The JM signal of the first communication method is detected for a predetermined time, and if the JM signal of the first communication method is not detected, the transmission of the CM signal of the first communication method is stopped and the second communication method is stopped. When the DIS signal of the second communication method is detected and the DIS signal of the second communication method is detected, the first signal is included in the DIS signal.
A communication device for transmitting a CI signal of a first communication method upon detecting information that allows communication of the communication method. 4. After starting transmission of a CI signal of the first communication method based on detection of information enabling communication of the first communication method, a carrier frequency of an ANSam signal of the first communication method is detected by a frequency filter. Any one of claims 1 to 3
The communication device according to item.