JPH0775390B2 - Automatic level adjustment type equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to facsimiles, teletex and other data communication devices, and more specifically, transmission and reception of image signals according to the state of a communication partner. The present invention relates to a facsimile apparatus capable of varying the level and constantly transmitting and receiving data at an appropriate signal level.

2. Description of the Related Art When facsimile communication is performed using an unspecified number of communication lines with an unspecified number of destinations, the signal level of data varies depending on the communication line, which often adversely affects communication. That is, in the conventional facsimile apparatus, when the attenuation of the communication line is large and the signal level is low, or when the signal is distorted due to excessive amplification of the communication line, the facsimile communication may be adversely affected. Due to this adverse effect, the transmitted image may be disturbed, and when communication is unavoidably reduced at the communication rate, the communication time becomes long.

Aim The present invention has been made in view of the above points, solves the above-mentioned drawbacks of the conventional technology, and always communicates with an appropriate level signal without being affected by the degree of communication with the other party. It is an object of the present invention to provide a facsimile device that can be performed.

Structure The facsimile apparatus of the present invention has a network control unit for interfacing with a communication line, a modem for modulating and demodulating a transmission / reception signal, and a system control unit connected to the network control unit and the modem. A memory is provided in the system control unit to record a telephone number of a specific destination and signal level adjustment information for setting an appropriate signal level when communicating with the destination. When communicating with a recorded destination, the signal level is automatically adjusted according to the corresponding signal level adjustment information, and it is possible to always communicate with the destination at an appropriate level.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an example of a concrete implementation of a facsimile apparatus constructed according to the present invention. still,
For simplification, FIG. 1 shows only a portion related to control of internal communication of the facsimile machine. As shown in the figure, the facsimile device generally includes a network control unit (NCU) 1 for interfacing with a communication line, a modem (MODEM) 2 for modulating and demodulating a transmission signal, and a control of the overall operation of the facsimile device. It has a system control unit (SCU) 3 for performing the operation and an operation control unit (OCU) 4 for giving an operation command by an operator and displaying the status of the facsimile apparatus.

A telephone 5 is provided so as to be connected to the network control unit 1 and a telephone number of a desired destination is input. Further, a line switching circuit 1a is provided in the network control unit 1, and the line switching circuit 1a has a pair of changeover switches connected to the communication line 6 and the telephone 5. A dial generation circuit 1b and a relay control circuit 1c are provided in connection with the line switching circuit 1a. The dial generation circuit 1b generates a dial pulse or dial tone based on the input telephone number. The relay control circuit 1c operates a switch in the line switching circuit 1a based on a signal from a system control unit, which will be described later, to perform line switching.

The line switching circuit 1a is further connected via a matching transformer 1d,
It is connected to the receiving amplifier 1e and the transmitting amplifier 1f.
A transmission / reception level control circuit 1g is provided in the network control unit 1 so as to be connected to each of the amplifiers 1e and 1f. As will be described later, the transmission / reception level control circuit controls the amplifiers according to the level adjustment signal from the system control unit 3.
This is a circuit that controls the amplification degree of 1e or 1f in several steps to maintain the level of the transmission signal at an appropriate level. A modem 2 is provided so as to be interposed between the network control unit 1 and the system control unit 3, so that a transmission signal transmitted / received from the system control unit 3 is modulated or demodulated by the modem 2.

The system control unit 3 controls the overall operation of the facsimile apparatus, and in the illustrated example, controls the network control unit 1, the modem 2 and the operation control unit 4, respectively. In the system control unit 3, a microcomputer 3a and a memory 3b connected to it are provided.
The microcomputer 3a is, for example, a central processing unit (CP
U), etc., and stores a program for controlling the operation of this facsimile machine. On the other hand, the memory 3b is an area in which at least a part thereof stores a telephone number of a specific destination and corresponding signal level adjustment information for changing the amplification degree of the transmission signal level to an appropriate level. Is defined. Therefore, if the destination of transmission / reception is registered in this specific area of the memory 3b, the signal level adjustment information corresponding to it is read from the memory 3b in the protocol procedure, and the level of the signal is adjusted when transmitting / receiving the signal. To adjust the communication.

An operation control unit 4 is provided so as to be connected to the system control unit 3. This unit 4 serves as an interface between the present facsimile apparatus and an operator.
A key input circuit 4a and a display circuit 4b are provided. The key input circuit 4a is connected to various operation keys arranged on the control panel of the facsimile apparatus such as a start switch, a stop switch, a numeric keypad, and a function key (not shown). When a is operated, a required control signal is supplied to the system control unit 3. On the other hand, the display circuit 4b is a circuit for controlling a display such as a liquid crystal or an LED, which is also arranged on the control panel, and displays, for example, the status of the facsimile apparatus.

When using the facsimile device having the above-mentioned configuration, the operator previously codes the destination name whose communication signal level is usually not so good and an appropriate signal level value corresponding thereto and records it in the memory 3b. Keep it. In this case,
The operator stores the data in the memory 3b via the operation control unit 4 using a ten-key (not shown) provided on the control panel of the facsimile apparatus. It is desirable to prevent the data stored in the memory 3b from being destroyed when the power of the present facsimile machine is turned off.
M is good. The destination name information is the telephone number of the destination, or the ID (identification signal) of the destination is used.

FIGS. 3 and 4 show one mode of storing the telephone number and the transmission signal transmission level corresponding thereto in the apparatus of FIG. As described above, the telephone number of each user and the transmission signal transmission level corresponding to the telephone number are input by the operator from the ten keys on the facsimile operation panel (not shown). In the example shown in Figs. 3 and 4, the abbreviated number "* 00"
Shows the operation flow and the storage state when storing the telephone number "01234546789" and the transmission signal transmission level "-10 dB". In the flowchart of FIG. 3, the first step after the start is to set the input mode for storing data in the memory 3b by using the function key or the like on the operation panel. After setting the input mode, use the numeric keypad to input the required data. Incidentally, the input step of "#" indicates the break of the operation.

FIG. 4 shows the storage state of telephone numbers in the memory 3b composed of RAM. In this example, RAM3b 8000H to 8007H (8
One phone number is stored in (byte). In addition, FFH = (11111111B) is inserted as the telephone number delimiter.
Here, "H" represents hexa and "B" represents binary. For the transmission signal level of -10 dBm, the number "10" is put in the last byte (8007H). If the transmission signal level is not specified, the last byte shall be FFH.

Next, a detailed description will be given of the case where the facsimile apparatus shown in FIG. First, the case of performing the transmission operation will be described with reference to the flowchart of FIG. The operator sets the original to be sent to the facsimile device and sets the telephone number of the other party. When the start button is pushed down, the system control unit 3 instructs the dial generating circuit 1b provided in the network control unit 1 to send a dial pulse and sends the dial to the line 6. At the stage of sending out the dial, the system control unit 3 checks whether or not the dial number is the number of the other party registered in the memory 3b. If it is the corresponding number, the system control unit 3 The amplification factors of the reception amplifier 1e and the transmission amplifier 1f are set to the registered proper signal level values, and communication is performed at these proper levels.

FIG. 2 shows transmission / reception of a signal between the transmission side and the reception side. In the above-mentioned embodiment, the data of the destination name is ID.
When the signal is received in NSF or DIS of G III protocol, when the signal is received, the receiving and transmitting amplifier
Set proper signal level values to 1e and 1f.

On the other hand, when receiving transmission data, no dial pulse is generated, so the destination name is detected by the ID in the NSS or DCS sent from the transmitting side, and the appropriate signal level of the transmitting and receiving amplifiers 1e and 1f is detected. Set the value. However, in the case of receiving by dialing (for example, polling), an appropriate signal level may be set when the destination telephone number is transmitted.

Effect As described above in detail, according to the present invention, even when data transmission is always performed with a partner who has a bad line condition, by storing appropriate transmission conditions in advance, communication with that partner can be performed. Since the program automatically resets the transmission signal to an appropriate condition to perform communication, it is possible to always perform the samurai communication while maintaining the desired image characteristics, and it is possible to shorten the communication time. is there.

The specific embodiments of the present invention have been described above in detail, but the present invention should not be limited to these specific examples, and various modifications can be made without departing from the technical scope of the present invention. Of course, it is possible. For example, depending on the communication partner, not only the signal level but also the setting condition (equalizing condition etc.) of the modem can be variably set.

[Brief description of drawings]

FIG. 1 is a block diagram of a facsimile apparatus constructed according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing a transmission / reception relationship of signals based on the G III protocol between a transmission side and a reception side, FIG. 3 is a flow chart showing an operation sequence for inputting a telephone number as a shortened number, FIG. 4 is an explanatory diagram showing a state in which a telephone number is stored in a memory according to the flow of FIG. 3, and FIG. It is a flowchart figure which showed the operation sequence at the time of transmitting transmission data by the apparatus of the figure. 1: Network control unit 2: Modem 3: System control unit 4: Operation control unit 1g: Transmission / reception level control circuit 3b: RAM memory

Claims (1)

[Claims] 1. A network control unit for controlling a connection state with a communication line, a modem connected to the network control unit,
In a facsimile apparatus having a network control unit and a system control unit connected to a modem to control transmission / reception of data, the network control unit has amplifier means for adjusting a signal level of data passing therethrough. Moreover, the system control unit has a unique code (ID) of the device incorporated in the digital identification signal (DIS) sent from the other side at the time of transmission or the digital command signal (DCS) sent from the other side at the time of reception. ) Is received, if the signal level information corresponding to the unique code is stored in the memory, the signal level is adjusted to an appropriate level according to the signal level information in the memory. Facsimile machine.