JPH0591275A - Facsimile equipment and controlling method thereof - Google Patents

Abstract

PURPOSE:To reduce size and cost of a facsimile equipment. CONSTITUTION:A coil 12 is connected in series to a line L, magnetic flux to be generated corresponding to the flowing direction of line current is converted into a voltage value by a magnetic sensor 13, and the off-hook of the equipment itself and an opponent equipment is detected based on the comparision between the converted voltage value and a reference voltage value (VREF) obtained by comparators 15 and 16. The voltage value of the magnetic sensor 13 is inputted to a tone signal detection circuit 3c of a MODEM 3 via a signal line S and the input of a facsimile network calling signal is detected by a tone signal detection circuit.

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 its control method, and more particularly to a facsimile machine provided with a network control section for detecting a direct current circuit in a communication line, polarity reversal detection, and facsimile network call detection, and a control method thereof. Regarding

[0002]

2. Description of the Related Art At present, when image data is transmitted / received using a facsimile machine, communication is performed between G2 and G3 machine type facsimile machines via a public telephone line. Therefore, the calling operation and the like at the start of communication are performed in the same manner as the telephone.

In addition to this public telephone line, for example, in the case of a simple type facsimile machine called a mini-fax from NTT, communication is performed via a dedicated facsimile line. Therefore, at the start of communication, a facsimile network calling signal (1
300 Hz) must be detected. So, fair 1
As described in Japanese Patent Laid-Open No. 15250, in order to enable communication between different types of facsimile machines using different communication lines, two detection circuits for detecting a ringing signal corresponding to each line are provided. There is.

For example, FIG. 4 is a diagram showing a circuit configuration of a network control unit in a conventional facsimile apparatus. As shown in FIG. 4, the network control unit includes a DC circuit / polarity reversal detection unit 1, a dial pulse transmission unit 2, a modem 3, a line protection unit 4, a ringing detection unit 5, which detects off-hook of the other party and the partner station. The facsimile network call detection unit 6, the telephone 7, the line switching unit 8 for switching between the line side and the modem side, and the like.

Therefore, when communicating via a public telephone line, when a ringing signal arrives through the line L, the ringing detection section 5 detects the ringing signal, the hook switch operates and the off-hook state is established, and the other station A DC circuit is formed between them. As a result, depending on the direction of the current flowing through the line L, one of the photocouplers of the DC circuit / polarity reversal detection unit 1 operates and one of the output terminals becomes V _CC . The output result of the DC circuit / polarity inversion detection unit 1 is detected as off-hook by the CPU (not shown) via the I / O port.

Further, when transmitting from the device of the other party to the facsimile device of the other party, the telephone 7 is off-hooked, the dial pulse of the partner station is transmitted by the dial pulse transmitter 2 to originate the call, and the call is received off-hook of the partner station. ..
In this case, the off-hook detection of the partner station is performed by the polarity reversal detection of the line current by the DC circuit / polarity reversal detection unit 1.

Next, when communicating via a facsimile dedicated line, the facsimile network call detection unit 6 of FIG. 4 is used, and the 1300 Hz facsimile network call signal sent at the start of communication is the transformer 6b and the capacitor 6c.
Is detected by the tone detector 6a. Another example of this type of facsimile machine is Japanese Patent Laid-Open No. 62-2769.
No. 61 publication is available.

[0008]

However, in such a conventional facsimile apparatus, the network control section is composed of analog components having high withstand voltage because of the characteristics of the telephone line. There was a problem that it was difficult to reduce costs. In particular, since the tone network 6a detects the facsimile network ringing signal in the facsimile network ringing detection section 6 shown in FIG. 4, a large capacitor 6c for high withstand voltage and a transformer 6b are required, and miniaturization is difficult. It was

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a facsimile apparatus and a control method therefor which can be reduced in size and cost.

[0010]

The invention according to claim 1 is
Magnetic flux generating means for generating a magnetic flux according to the direction of the current flowing through the line; magnetic flux detecting means for outputting a voltage value corresponding to the magnetic flux state; and comparing means for comparing the voltage value with a predetermined reference voltage value. , And the voltage value of the magnetic flux detecting means is input to the modem.

According to a second aspect of the present invention, the voltage value of the magnetic flux state detecting means is input to the tone signal detecting circuit of the modem, and the tone signal detecting circuit detects the calling signal of the facsimile network. The invention according to claim 3 is
The off-hook of the telephone is detected based on the output result of the comparing means, the output result at the time of detecting the off-hook is stored, and the output result after calling is compared with each other, and the polarity reversal of the line current is detected when they do not match. The off-hook of the other party is detected as being present, and the tone signal detection circuit detects the facsimile network calling signal based on the voltage value of the magnetic flux detection means.

[0012]

In the present invention, the magnetic flux generating means generates a magnetic flux according to the direction of the line current, the magnetic flux detecting means outputs a voltage value corresponding to the magnetic flux state, and the voltage value and the reference voltage value are compared with each other. The off-hook between the telephones of me and the partner station can be detected when the communication is performed via the public telephone line.

Further, by simply connecting the two by a signal line so that the output voltage value of the magnetic flux detecting means is inputted to the input terminal of the tone signal detecting circuit of the modem, the facsimile can be used by using the existing tone signal detecting circuit. The ringing signal of the network can be detected. Therefore, the facsimile network call detection unit using the tone detector as in the related art is unnecessary.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. First, the configuration will be described. FIG. 1 is a sectional view showing the construction of an embodiment of the facsimile apparatus according to the present invention. As shown in FIG. 1, the characteristic configuration of the facsimile apparatus of this embodiment is that it is provided with a line state detection unit 11 that detects the line state.

That is, the line state detection unit 11 of this embodiment
Is a coil 12 (flux generating means) connected in series to the line L that generates a magnetic flux according to the direction of the line current, and a magnetic sensor 13 (magnetic flux that outputs a voltage value according to the magnetic flux state generated by the coil 12). (Detection means), an amplifier 14 that amplifies this voltage value by a constant rate, and comparators 15 and 16 (comparison) that binarizes the result of comparing the output voltage value of the amplifier 14 with a reference voltage (V _REF ) set to a predetermined value. Means).

Further, the output voltage value of the amplifier 14 is further input to the input terminal of the tone signal detecting circuit 3c of the modem 3 so that the line state detecting section 11 and the tone signal detecting circuit 3c are connected by the signal line S. It is connected. The dial pulse sending unit 2, the modem 3, the line protection unit 4, the ringing detection unit 5, the telephone 7 and the line switching unit 8 other than the above are the same as those in the conventional example of FIG.

Further, DC1, D of the line state detecting section 11
Each output data of C2 and RING of the ringing detection unit 5 is sent from the I / O port 17 to each unit via the data bus 18. CPU (Central Processing Unit)
Reference numeral 19 controls the entire system. RO
An M (Read Only Memory) 20 stores firmware that determines the control operation of the CPU 19, and a RAM
The (Random Access Me-mory) 21 has a work area and a temporary storage area necessary for the CPU 19 to control. In addition, in the other units 22,
Although the facsimile machine includes a plotter, a scanner, and the like necessary for the facsimile machine, their description is omitted here.

Next, the operation will be described. FIG. 2 is a flow chart for explaining off-hook detection by the line state detection unit, and FIG. 3 is a flow chart for explaining detection of a facsimile network ringing signal using the tone signal detection circuit.
In step 100 of FIG. 2, if the facsimile machine is in the standby state and the telephone 7 is on-hook,
Since the line current does not flow in the line L in FIG. 1, no magnetic flux is generated in the coil 12 and the output DC of the comparators 15 and 16 is DC.
Since 1 and DC2 output a constant value of "0", the on-hook state can be confirmed.

When the telephone 7 is off-hook in step 100, a line current flows and a DC circuit is formed. At this time, depending on the direction of the current flowing through the line L, the coil 12
The magnetic flux state generated by is different, a voltage value corresponding to the magnetic flux state is output from the magnetic sensor 13, amplified by the amplifier 14, and input to the respective terminals of the comparators 15 and 16. The reference voltage (V _REF ) is connected to the other terminals of the comparators 15 and 16, and the result of comparison with this is output from DC1 and DC2. That is, depending on the direction of the line current, one becomes V _CC and the other becomes 0. Therefore, the CPU 19 can recognize the off-hook by monitoring the output result through the I / O port 17.

Then, in step 101, the CPU 19 causes the RAM 21 to store the output result at the time of off-hook detection, that is, the polarity of the line current. Next, the dial pulse sending unit 2 sends the dial pulse of the partner station to make a call (step 102). If there is an off-hook from the partner station after calling, the polarity of the line current will be reversed. Therefore, the CPU 19 compares the output result at the time of off-hook detection stored in the RAM 21 in step 103 with the output result after the call is made. In step 104, it is judged whether or not the output result has changed, and if the output result has changed, it can be recognized that there is polarity inversion, the polarity inversion flag is turned on in step 105, and the off-hook of the partner station can be recognized. ..

If the output result does not change in step 104, the partner station is on-hook. Next, referring to the flowchart of FIG. 3, a procedure for detecting a facsimile network calling signal will be described. First, in step 200, when the facsimile apparatus is in the standby state, it is first determined whether or not the tone signal detection circuit 3c of the modem 3 is set, and if it is not in the set state, the tone signal detection frequency and the tone signal detection frequency are detected in step 201. Set level and to a predetermined value. In step 202, the set flag of the modem is turned on and the process returns to step 200.

Here, since the tone signal detection circuit 3c has already been set, the routine proceeds to step 203, and a calling signal from the facsimile network (generally -1 at 1300 Hz).
When a signal of 0 to -30 dBm) is input from the line L,
It is input to the tone signal detection circuit 3c of the modem 3 through the coil 12, the magnetic sensor 13, the amplifier 14 and the communication line S. When a signal is detected by the tone signal detection circuit 3c, the tone signal detection flag is turned on in step 204, and the fact that a call has been made from the facsimile network is confirmed by the CP.
It can be recognized by U19.

[0023]

According to the facsimile apparatus and the method of controlling the same of the present invention, since the line state detecting section in which the DC circuit / polarity inversion detecting section and the facsimile network call detecting section in the conventional example are shared is constituted, It is possible to reduce the size and cost of the facsimile device.

[Brief description of drawings]

FIG. 1 is a configuration cross-sectional view showing an embodiment of a facsimile apparatus according to the present invention.

FIG. 2 is a flowchart showing an off-hook detection procedure by a line state detection unit.

FIG. 3 is a flowchart illustrating a procedure for detecting a facsimile network call signal using a tone signal detection circuit.

FIG. 4 is a diagram showing a circuit configuration of a network control unit in a conventional facsimile apparatus.

[Explanation of symbols]

 3 modem 3c tone signal detecting circuit 11 line state detecting unit 12 coil (magnetic flux generating means) 13 magnetic sensor (magnetic flux detecting means) 14 amplifier 15 and 16 comparator (comparing means) 17 I / O port 19 CPU

Claims (3)

[Claims] 1. A magnetic flux generating means for generating a magnetic flux according to the direction of a current flowing through a line, a magnetic flux detecting means for outputting a voltage value corresponding to the magnetic flux state, and a voltage value and a predetermined reference voltage value. A facsimile apparatus comprising: a comparing unit that compares the input voltage value of the magnetic flux detecting unit to a modem. 2. The facsimile apparatus according to claim 1, wherein the voltage value of the magnetic flux state detecting means is input to a tone signal detecting circuit of the modem, and the tone signal detecting circuit detects a calling signal of the facsimile network. .. 3. An off-hook of the local telephone is detected based on an output result of the comparing means, an output result at the time of detecting the off-hook is stored, the output result is compared with an output result after a call is made, and a line is detected when they do not match. A method for controlling a facsimile machine, characterized in that the off-hook of the other party is detected as if the polarity of the current was reversed, and the tone signal detection circuit detects the facsimile network ringing signal based on the voltage value of the magnetic flux detection means.