JPH08251370A - Facsimile equipment - Google Patents

Abstract

PURPOSE: To obtain a facsimile equipment having a G3 protocol function and setting a transmission level in response to a destination at the start of transmission. CONSTITUTION: A receiver side has a V21 level measurement section 13 measuring MODEM information including an AGC value and an EQM value based on a V21 signal or the like sent from a sender side and adds the MODEM information to an MCF signal and the resulting signal is sent to the sender side. Furthermore, the sender side has a memory section 2 storing the MODEM information and an incoming number sent from the receiver side, and when information is sent to a same called number again, a transmission level of the V21 signal and the carrier signal and the communication speed are set based on the MODEM information corresponding to the called number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile machine, and more particularly to a G3 facsimile machine capable of automatically adjusting a transmission level.

[0002]

2. Description of the Related Art Conventionally, in a G3 facsimile apparatus, the transmission level is set to a fixed value, and the communication speed is lowered by one step when the modem training signal (TCF signal) is transmitted twice and the FTT signal is received again. I have decided. On the other hand, in the device disclosed in Japanese Patent Laid-Open No. 9264/1989, the transmission side transmits the automatic gain control voltage information (AGC value) and the error bit information in the TCF reception section so that the transmission side transmits the information. The level and communication speed are determined. Furthermore, by the same applicant as the present application, the AGC value and the eye quality monitor information (EQM value) measured on the receiving side are M
A modem control method has been proposed in which the optimum modem setting level is set at the time of multi-page transmission by adding the CF signal. This method uses CCIT via a communication line.
When communication information is communicated from the first facsimile device to the second facsimile device based on the transmission control procedure of T Recommendation T30, the AGC value and the EQM value are based on the transmitted V21 signal and at least one of the high-speed carrier signals. The modem level information including the above is measured by the level measurement unit, an appropriate transmission level is set during multi-page transmission, and the AGC value and EQM value at the time of past communication are grasped at the transmitting side.
By setting an appropriate transmission level based on the reception level of, the appropriate transmission level and communication speed can be set from the time when the first TCF signal is transmitted.

[0003]

In the prior art by the same applicant, there is a method of setting the sending level at the start of sending only by default. Further, when setting the transmission level of the own device from the V21 reception level, it is not possible to set an appropriate value because the transmission level of the other device is unknown. SUMMARY OF THE INVENTION An object of the present invention is to provide a facsimile apparatus which can solve the above problems and can set a transmission level according to the other party at the start of transmission. It also aims to set an appropriate transmission level for the device itself.

[0004]

In order to achieve the above object, the invention according to claim 1 has a G3 protocol function, and the receiving side is based on the V21 signal or high-speed carrier signal transmitted from the calling side. Automatic gain control voltage information (A
Means for measuring modem information including GC value) and eye quality monitor information (EQM value) (13 in FIG. 1), and means for controlling the modem information to be added to the MCF signal and transmitted to the calling side (see FIG. In a facsimile machine equipped with 1) of 1), a means for storing the modem information and the called number (2 in FIG. 1) and a call transmission to the same called number again,
It is characterized by including means (1 in FIG. 1) for controlling so as to set the transmission level and communication speed of the V21 signal and carrier signal based on the modem information corresponding to the called number. Further, the invention according to claim 2 is configured such that, in the facsimile apparatus having the G3 protocol function, the destination side maps the transmission level to the non-standard function identification signal (NSF signal) and transmits it to the originating side. There is. Further, the invention according to claim 3 is the device according to claim 2, wherein the means for measuring the level of the signal actually received from the receiving side (13 in FIG. 1) and the transmission level mapped to the NSF signal and the actual It is characterized in that it is provided with means (1 in FIG. 1) for calculating the line deterioration from the difference with the reception level of 1 and controlling so as to set the optimum transmission level.

[0005]

According to the present invention, in the G3 facsimile communication, the AGC value and the EQ on the receiving side are based on the V21 signal or the carrier signal transmitted from the calling side on the receiving side.
The V21 level measuring unit measures the modem information including the M value, adds the modem information to the MCF signal, and transmits the MCF signal to the calling side. Further, when the modem information and the called number transmitted from the called side are stored in the memory unit and the call is transmitted again to the same called number, the V21 is added based on the modem information corresponding to the called number. Set the transmission level and communication speed for signals and carrier signals. According to the second aspect of the present invention, in the G3 facsimile communication, the destination side maps the transmission level to the NSF signal and transmits the NSF signal to the originating side. Claim 3
In the described invention, in the G3 facsimile communication, the level of the signal actually received from the destination side is measured by the V21 level measuring unit, and the difference between the transmission level mapped to the NSF signal and the actual reception level is measured. Calculate line degradation and set the optimum transmission level. In this way, the AGC value and EQM value of the past communication are grasped on the transmitting side, and the appropriate transmission level is estimated from the reception level of the V21 signal.
An appropriate transmission level and communication speed can be set from the TCF transmission.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. It should be noted that a method of reading a document and a method of outputting received data, which are not directly related to the present invention, will be omitted. Figure 1
It is a block diagram of the ISDN facsimile terminal connected to the basic interface in one embodiment of the present invention. In FIG. 1, a system control section 1 executes control processing of the entire facsimile terminal, and a memory section 2 controls a control processing program executed by the system control section 1 and various data necessary for the control processing. , And various kinds of information unique to the facsimile terminal, for example, modem information such as a calling number, a called number, an AGC value and an EQM value. The operation display unit 3 is for operating this facsimile terminal, and inputs a subscriber number and the like.
This consists of various operation keys and the like. The scanner unit 4 is for reading an original image at a predetermined resolution, and the plotter unit 5 is for outputting received data.
The image memory unit 6 is for accumulating images, and the encoding / decoding unit 7 is for encoding and compressing the image signal and for decoding the encoded and compressed image information into the original image signal. . The image memory unit 6 stores image information in a coded and compressed state.

The LAPD control unit 8 is for realizing the line control processing of the basic interface function of ISDN, and the ISDN interface unit 9 is for connecting this facsimile terminal to the network termination device (NT) of ISDN. It is a thing. The CODEC unit 10 is for performing an analog signal / digital signal conversion process for transmitting an analog signal using the ISDN B channel.
The modem section 11 is for realizing the function of the modem section of the G3 facsimile, and is a low-speed modem (V21 modem) for exchanging transmission procedure signals and a high-speed modem (V29 modem, V27t) for exchanging image information.
er modem, V33 modem, V17 modem). The network control unit 12 sends this facsimile terminal to the PSTN.
It is for connecting to (public telephone network) and has an automatic call-in / out function. V21 level measuring unit 13 is V
21 to measure the level of the received signal. Further, the system control unit 1, the memory unit 2, the operation display unit 3, the scanner unit 4, the plotter unit 5, the image memory unit 6, the encoding / decoding unit 7, the LAPD control unit 8, the ISDN interface unit 9
Is a CODEC unit 10, a modem unit 11, a network control unit 12,
The V21 level measuring unit 13 is connected to the system bus 14, and various information exchanged between these respective elements is performed via this system bus 14.

FIG. 2 shows an example of communication in the transmission control procedure between the G3 facsimile machines of this embodiment. When the calling terminal (TX) makes a call, the called terminal (RX) responds to the incoming call, and then the called station identification signal (CED signal) for indicating that the terminal itself is a non-voice terminal, which is equipped on the terminal itself Non-standard function identification signal (NSF signal) for displaying the non-standard terminal function provided, and digital identification signal (DIS signal) for displaying the standard terminal function equipped in the own terminal Are sequentially transmitted. Next, the calling terminal (T
X) selects a terminal function to be used at that time among the terminal functions indicated by the received NSF signal and DIS signal, and outputs a non-standard function identification signal (NSS signal) to which information indicating the content is added. Then, the modem section training signal (TCF signal) is sent at the designated modem section speed. Next, when the destination terminal (RX) receives the NSS signal, it sets the terminal function according to the content, receives the TCF signal at the designated modem section speed, and if the result is good, receives it. A preparation confirmation signal (CFR signal) is responded. Next, when the calling terminal (TX) receives the CFR signal, it sends the image information of the first page (PIX signal) and sends the procedure end signal (EOP message signal).

Next, upon receiving the EOP message signal, the destination terminal (RX) responds with a message confirmation signal (MCF signal) if the reception result of the PIX signal that has been received immediately before is good. Next, the calling terminal (TX)
When the MCF signal is responded from the destination terminal (RX), a disconnection command signal (DCN signal) is sent to restore the line. Upon receiving the DCN signal, the destination terminal (RX) restores the line.

Now, the structure of the NSF signal of this embodiment will be described. In this embodiment, as shown in FIG. 3, the signal type (NSF) is indicated in the first field (FCF) of the NSF signal, and the V21 reception level is added to the second field (FIF).

Next, the operation of the first embodiment (claim 1) will be described with reference to FIG. In this embodiment, at the time of calling, it is judged whether or not the party has once communicated with the called number (step 101). If the communication partner has never communicated with him / her, the communication processing is performed normally (step 102).
If the communication has been made even once, the transmission level and the communication speed are set based on the modem section information corresponding to the called number stored in the memory section 2 (step 103), and the process proceeds to step 102. . The carrier setting side adds the modem section setting information to the MCF signal, and the carrier transmitting side fetches it. More specifically, the destination terminal (R
X) adds the modem section information including the AGC value and the EQM value measured by the V21 level measuring section 13 based on the V21 signal level from the calling terminal (TX) to the MCF signal. The signal type (MCF) is shown in the first field (FCF) that constitutes this signal, and the AGC value and the EQM value are added to the second field (FIF). This system has been proposed by the same applicant as described above.

Next, the operation of the second embodiment (claim 2) will be described. In this embodiment, the transmission level is mapped to the NSF signal by the destination terminal (RX), and this is mapped to the source terminal (TX).
Send to.

Next, the operation of the third embodiment (claim 3) will be described with reference to FIG. In this embodiment, when a call is made, the V21 signal level sent from the called terminal (RX) is set to V2.
The one-level measuring unit 13 measures (step 201).
Then, it is checked whether the transmission level is mapped to the NSF signal sent from the destination terminal (RX) (step 202). If the transmission level is not mapped, the line degradation is estimated and the optimum transmission level is set (step 203). If the transmission level is mapped, the line degradation is calculated and the optimum transmission level is set in the modem section 11 of the own device (step 204). In this embodiment, the ISDN facsimile terminal has been described, but it does not have to be a terminal connected to ISDN.
Other networks may be used.

[0014]

According to the present invention, A of the modem section on the other side is
When the modem section information such as the GC value and the EQM value is stored and transmitted to the same partner, the optimum transmission level and communication speed of the modem section can be set without repeating training. Further, since the line deterioration can be calculated from the actual reception level and the transmission level sent by the other party, it is possible to set the optimum transmission level and communication speed of the modem section.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ISDN facsimile terminal according to an embodiment of the present invention.

FIG. 2 is a transmission sequence diagram according to a transmission control procedure between G3 facsimile apparatuses according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of an NSF signal in an example of the present embodiment.

FIG. 4 is a flow chart showing processing at the time of making a call in the first embodiment of the present embodiment.

FIG. 5 is a flow chart showing processing at the time of making a call in the third embodiment of the present embodiment.

[Explanation of symbols]

1: system control unit, 2: memory unit, 3: operation display unit,
4: scanner unit, 5: plotter unit, 6: image memory unit,
7: Encoding / decoding unit, 8: LAPD control unit, 9: ISD
N interface (ISDN I / F), 10: CO
DEC section, 11: modem section, 12: network control section, 13: V
21 level measuring unit, 14: system bus.

Claims (3)

[Claims] 1. A facsimile apparatus having a G3 protocol function, wherein the receiving side includes an AGC value and an EQM value based on a V21 signal transmitted from the calling side and at least one signal of a high speed carrier. A facsimile apparatus configured to measure modem information, add the modem information to an MCF signal and transmit the MCF signal to a calling side, comprising means for storing the modem information and the called number transmitted from the called side. When the outgoing call is sent to the same called number after the second sending, V21 is added based on the modem information corresponding to the called number.
A facsimile machine characterized in that it is configured to set a transmission level and a communication speed of signals and carrier signals. 2. A facsimile machine having a G3 protocol function, characterized in that the transmission level is mapped to an NSF signal and transmitted to the calling side. 3. The facsimile apparatus according to claim 2, further comprising means for measuring a level of a signal actually received from a destination side, and a line is obtained from a difference between a transmission level mapped to the NSF signal and an actual reception level. A facsimile apparatus characterized in that it is configured to calculate deterioration and set an optimum transmission level.