JPH02266747A - Communication equipment - Google Patents

Abstract

PURPOSE:To generate a call signal with an arbitrary frequency by providing a DC/DC converter, a means to perform the on/off control of the output voltage of the converter, and a means to switch the polarity of on-and off-controlled voltages. CONSTITUTION:A call signal generation circuit is provided with the DC/DC converter A, a polarity inversion part B, a ring top detection circuit 16, and a control circuit 17. The control circuit 17 and a gate 2 perform the on/off control of the output voltage of the DC/DC converter A, and the control circuit 17 and a phototransistor 9 perform the on/off control of the on-controlled voltages again. The control circuit 17 and photothyristors 10-13 of the polarity inversion part B switch the polarity of the on-and off-controlled voltages alternately. In such a manner, it is possible to easily change the frequency and the voltage of the call signal generated by the software processing of the control circuit 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a communication device having a function of generating a calling signal, or a communication device to which other terminals can be connected.

[Conventional example]

In general, as a ringing signal without ringing the telephone bell, 1
6H2, 75V '>i pressure constant! 73m period 1 For example,
An intermittent signal (on for 1 second and off for 2 seconds) is used. FIG. 3 is a diagram illustrating the principle of not ringing a telephone bell.

FIG. 4 is a diagram showing an example of a conventional ringing signal generation circuit for ringing the bell of a telephone.

In this conventional example, an oscillation circuit 18 of 161(z, an amplifier 19, a control circuit 21, a gate 22 that opens and closes according to a control signal from the control circuit 21, an output transformer 20 that boosts the output of the amplifier 19, It has an output terminal 15-T connected to a telephone etc., and a ring trip detection circuit 1G that monitors whether or not the output terminal 15-R is connected by a DC circuit. Sending signal (1 second) 1':''
.

This circuit detects whether a DC loop is formed or not, and detects the formation of a DC loop by integrating the signals of the output terminals 15-T and 1.5-R and determining whether the integrated signal is one novel.

In the conventional device described above, the control circuit 21 does not ring the bell of the telephone connected via the output terminal 15.
A control signal shown in FIG. 5(h) is applied to the control signal. The output signal of the gate 22 becomes as shown in FIG. 5(j), and this output signal is amplified by the amplifier 19 to become the signal shown in FIG. 5(k). The signal is sent to the telephone via terminal 15, and the bell of this telephone rings.

When the handset of the telephone is picked up, a direct current circuit is formed, which is detected by the ring trip detection circuit 16 and transmitted to the control circuit 21 . The control circuit 21 stops the control signal being applied to the gate 22, and thereby the bell stops ringing.

Furthermore, telephone lines have conventionally been used not only for telephone calls, but also for data communications such as facsimile machines and teletex machines. Generally, facsimile machines are equipped with a switching relay that selectively connects a telephone and a facsimile machine to a line in order to enable telephone calls and facsimile communications.The switching relay is switched under the control of the facsimile machine's controller. There is. In the automatic reception mode, when a call signal is received from the line, the line is automatically switched from the telephone to the facsimile machine to receive the image signal.

Further, a communication system has been proposed in which the above-mentioned facsimile machine is connected to a dedicated telephone in a key telephone system. In such a communication system, a dedicated telephone is provided with a ring signal generation circuit and a ring trip detection circuit as shown in FIG. 4 to automatically start up a facsimile machine.

Further, in the above communication system, when calling a facsimile communication party from the dedicated extension telephone using the telephone number signal sending function or the like and performing facsimile communication using the facsimile device 4, the following procedure is performed.

FIG. 6 shows the basic configuration of the communication system described above.

- A DC loop is created in the communication line 66 and line 61 by off-hooking the handset and receiver of the dedicated extension telephone.

■Input the telephone number of the calling party (communication partner) using the telephone number button on the dedicated extension telephone and send it to line 61.

■After confirming the response from the other party's facsimile machine, operate the dedicated extension telephone, and when the facsimile machine 64 forms a DC loop on the communication line 68 for connecting the dedicated telephone and the facsimile machine, connect the telephone line 66 and the communication line 68. Prepare to connect and form a communication path.

■When the handset of the general telephone 65 is off-hook and the start button of the facsimile machine 64 is pressed, a DC loop is formed in the communication line 68, so the communication line 66.8 and the communication line 68 are connected. , enable facsimile communication.

■Perform facsimile communication between response facsimile devices.

[Problem to be solved by the invention] In the above conventional example, the step-up transformer 20 with a low frequency of 16 Hz
There is a problem in that the efficiency of power usage is poor. Further, if an attempt is made to reduce the loss of the step-up transformer 20, there are problems in that the shape of the transformer becomes larger, the transformer becomes more expensive, and the mounting volume of the calling signal generation circuit becomes larger.

Another problem is that even if an attempt is made to change the frequency or voltage of the generated calling signal, it cannot be easily changed.

Also, in the above-described communication system, high-voltage electronic components are required for the call signal generation circuit and the ring trip detection circuit, as described above.

Furthermore, it is necessary to detect the response of the facsimile machine by generating a pseudo ringing signal and detecting a ring trip, resulting in a problem that the control procedure becomes complicated.

(Means and effects for solving the problem) The present invention includes, for example, a DC/DC converter, a means for controlling the output voltage of the DC/DC converter on and off, and a means for controlling the output voltage of the DC/DC converter on and off.
A means for switching the polarity of the off-controlled voltage is provided, and by adjusting the timing of on/off control and the timing of polarity switching, it is possible to generate a calling signal of any frequency.

Furthermore, the present invention simplifies the configuration of the device by using the above-described configuration for generating a calling signal in a communication device.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, a calling signal generation circuit will be described as a first embodiment.

FIG. 1 is a block diagram showing the configuration of a calling signal generating circuit according to a first embodiment. The calling signal generation circuit shown in FIG. 1 includes a DC70C converter A, a polarity inverter B, a ring top detection circuit 1G, and a control circuit It.

The DC70C converter A includes a high frequency oscillation circuit 1 that constantly outputs a signal with a frequency of about 10-200KH2,
A gate 1-2 which intermittents the output signal of this high frequency oscillation circuit l.
and a switching element 3 such as a transistor or FET,
It has a step-up transformer 4, a rectifier stack 5, a smoothing capacitor C1, an I-transistor TRI, a bias resistor R1 for this transistor TR1, and a pot transistor coupler 9.

Polarity reversal part B is a photothysilisk coupler 10°! 1,12
．． 13 and a resistor R2.

The control circuit 17 and the gate 2 are examples of on/off control means that controls the output voltage of the DC/DC 71 inverter to be turned on for 1 second and turned off for 2 seconds. This is an example of means for further controlling the controlled voltage on and off in 16H2. The control circuit 17 and the photosilic couplers i0, 11, 12, 13 are examples of polarity switching means that alternately switches the polarity of the above-mentioned on/off@controlled voltage. The control circuit 17 is composed of a microphone, a ROM, and a RAM.

Next, the operation of the calling signal generation circuit shown in FIG. 1 will be explained.

FIG. 2 is a diagram showing signal waveforms of main parts of the circuit diagram shown in FIG. 1. FIG. 2, (a) to (i is a = a in FIG. 1)
5, which is the signal waveform of the part indicated by f. First, the high frequency oscillation circuit 1 outputs the high frequency signal shown in FIG. 2(a), and the control circuit 17 outputs the control signal shown in FIG. 2(b) to the gate 2. Output.

While this control signal is on, the high frequency signal drives the switching element 3 and boosts the voltage!・VC via Lance 4
A high frequency voltage of about 75 V is generated on the secondary side of the switching lance 4 (CCDC 24 to 48 V).

This high frequency voltage of approximately 75V is rectified by the rectifier stack 5, smoothed by the capacitor C1, and becomes a high voltage (approximately 75V) DC voltage. Further, the control circuit 17 controls the photocoupler 9, which causes the transistor TRI to be turned on and off at the timing shown in FIG. 2(e), thereby outputting an intermittent high voltage (approximately 75 cm).

In addition, the control circuit 17 connects and connects the photothysilisk couplers 10 to 13 at the timings shown in FIGS. A signal shown in FIG. 2(f) is generated at the output terminal 15, and this alternating current signal rings the bell of the telephone.

Note that the value of the resistor R2 is such that the ring trip detection circuit 16 cannot detect it when the handset of the telephone is not raised (or when a data communication device such as a facsimile machine does not form a DC loop). However, when the telephone handset is turned on, the value is sufficient to detect the formation of a DC circuit.

When the ring trip detection circuit 16 detects a ring trip, the control circuit 17 stops the above operation and the telephone ring stops.

In Fig. 1 above, photosilic couplers 10-13 are used to convert high DC voltage to AC, but other switching elements such as transistors and triacs may be used instead. good. Also, instead of the photozyristors 10 to 13, elements that do not cause follow-on current (for example, FETs, transistors, etc.) may be used.
In this way, there is no need to turn on and off the high voltage using the transistor TRI.

In addition, in FIG. 1 above, the transistor TRI cuts off the DC high voltage on the secondary side of the transformer 4 in order to stop the follow-on current through the Zyristors 10 to 13, but it cuts off the DC low voltage on the primary side of the transformer 4. You may also do so.

Further, the generation frequency of the high frequency oscillation circuit 1, the value of VCC, the step-up ratio of the transformer 4, and the frequency of the signal for ringing the bell may be arbitrarily set as necessary.

According to the above-described calling signal generation circuit, it is possible to increase the power usage efficiency and also to make the circuit compact.

Next, as a second embodiment, a case will be described in which the above-described calling signal generation circuit is used in a telephone having a switching function of sending a calling signal to a facsimile machine and switching the line to the facsimile machine.

FIG. 7 is a block diagram showing the configuration of a telephone according to the second embodiment.

In the figure, reference numeral 75 indicates an ordinary telephone, and reference numeral 82 indicates a facsimile machine as a device for performing communications other than telephone calls. Switching between these terminals is performed by a switching device 88. The switching device 88 may be built into the telephone 75, but it is arranged at least near the telephone 75 and is configured so that the user can manually switch the line connection.

Whether telephone line 72 is connected to telephone 75 or facsimile machine 82 is determined by two relays RLI and RL.
2. The control contacts of relay RL2 are connected to telephone line 72, and telephone 5 is connected to one of the contacts.

The other contact of relay RL2 is connected to one of the contacts of relay RLI. The control contacts of the relay RLI are connected to the facsimile machine 82 via a DC loop detection circuit 74 for detecting a calling operation of the facsimile machine 82.
It is connected to a wire type signal line 81.

The other contact of the relay RLI is connected to a DC supply circuit 73 for forming a pseudo line and a facsimile device 82.
A ring trip detection circuit 80 is connected in series with a ring trip detection circuit 80 for detecting a response from the facsimile machine 82.

The operation of the above circuit is controlled by a control section 76 consisting of a microprocessor or the like. The control procedure of the control unit 76 is stored in the ROM 76a.

There are two modes of operation of the switching device 88. That is, there is a mode in which the facsimile device 82 is always connected to the telephone line 72 and facsimile communication is always performed using the automatic call/receive operation of the facsimile device 82;
5 and the facsimile device 82, incoming calls are made using the telephone 75, and in the case of communication to the facsimile device 82, the line connection is transferred.

These modes are switched by a switch key 77. Further, a transfer key 78 is provided in order to transfer the call to the facsimile device 82 in a mode in which calls are always received by the telephone 75.

Next, the operation in the above configuration will be explained. When the automatic communication mode of facsimile device 82 is set by switch key 77, relays RLI and RL2 are connected to the lower and upper contacts, respectively, and facsimile device 82 is directly connected to telephone line 2.

On the other hand, when manually receiving a call using the telephone 75 using the switch key 77, the control procedure as shown in FIG.
6. This procedure is stored in the ROM 76a.

In this mode, relay RL2 is connected to telephone 75, and when a calling signal is transmitted from telephone line 72 in step S21 of FIG.
5 bells are rung.

If the telephone 75 is not off-hook in step S23, the bell continues to ring until it is confirmed in step S34 that the ringing signal has stopped. If no one takes the telephone 75 off-hook and does not answer, the other station gives up and the ringing signal is stopped in step S34, and the ringing of the bell is stopped in step S35.

On the other hand, when the telephone 75 is off-hook and someone answers, the process moves to step S24, the ringing signal of the line is stopped, and the ringing of the telephone 75 is stopped in step 825. Here, in step S2G, the operator determines whether the other station is attempting to perform facsimile communication by listening to the signal tone of the other station. If the other party's station is not a facsimile machine, a call is made in step S36, and the communication is terminated by on-hook in step S37.

On the other hand, if the other party's station is a facsimile machine, the operator presses the transfer gear 78 in step S27. This causes the process to proceed to the ringing signal sending routine of step 828, where the control unit 7G connects the relay RLI to the upper contact point in the diagram, and then sends the same ringing signal that the line sends to the ring trip detection circuit 80 using the ringing signal sending circuit 89. The data is output to the facsimile device 82 via (), and the facsimile device 82 is called in a pseudo manner.

Next, in step S29, the ring trip detection circuit 8
0, the response of the facsimile device 82 is monitored, and when the facsimile device 82 responds, transmission of the calling signal is stopped in step S30.

During steps 828 to S30, which are surrounded by broken lines in FIG. 8, the relay RL 2 is connected to the telephone 75, and the DC loop is held by the telephone 75. When the response from the facsimile machine is confirmed, in step S31, the RLI, R1 and R2 are connected to the lower and upper contacts, respectively, and the telephone line 2 is connected to the facsimile machine 22 side.

As a result, communication of the facsimile device 22 is started, but during this time, the state of the line loop is monitored by the DC loop detection circuit 4, and if there is no DC loop, it is determined that the facsimile device 22 has performed a line disconnection operation, and step S
At step 33, relays RLI and RL2 are returned to the standby state, and the process ends.

Next, FIG. 9 is a brochure diagram showing the call signal sending routine of step 328. The control section 76 in FIG. 7 and the calling signal sending circuit 89 (DC/D in FIG. 1)
The connection relationship between the C converter A and the polarity inverter B) is the same as that in FIG.

Hereinafter, the sending of the calling signal will be explained according to the flowchart shown in FIG.

Note that here, the period of the AC output voltage is set to T, and the outputs of e, a, and e are turned on and off at the mink. First, in step 528-1, a counter 2 is set to 0. Next, in step 328-2 chip 828-3 to step 328-6, the outputs of e, d, and e are on10ff controlled based on the counter values. Step 828-7 waits until the timer ends, and after the timer ends, step 328-7
-8 increments the counter value. Step 3
If the counter value becomes 8 at 28-9, then 828-1
When the value is 0, the counter value is set to O again.

In step 828-11, it is determined whether or not the AC output is to be stopped due to the end of the bell ringing period or ring trip detection, etc., and if the output is to be intermittent, step 828-11 is performed.
-2, and step 828-12 to stop the output.
branches and ends the outputs of e, d, and e at of fl.

Through the above processing, a calling signal as shown in FIG. 2(f) is generated. Furthermore, in Figure 2, T = 1/16
It is Hz.

In FIG. 9, the timer is a programmable timer, and the time T can be set arbitrarily. Therefore, by changing the time T, the cycle of the calling signal can be made variable. Generally, the standards for the period and pressure of the calling signal differ in each country, but according to this embodiment, this can be easily accommodated by setting the time T17) value.

The control circuit 17 in FIG. 1 (the same applies to the control section 76 in FIG. 7) outputs a control signal for controlling the duty ratio to the high frequency oscillation circuit 1 via the signal line 22, and the control circuit 17 in FIG. changes the duty ratio of the pulses output from the oscillation circuit 1 according to the control signal. This allows the voltage of the calling signal to be made variable, and as with the period, the control circuit 1
7 software processing makes it easy to comply with the standards of each country.

According to the second embodiment described above, the configuration of the calling bow generation circuit can be simplified.

However, in the second embodiment, in order to generate an alternating current signal of 16 Hz and 75 V r m S as a calling signal, the calling signal sending circuit 89 and the ring trip detecting circuit 80 require high-voltage electronic components. Become.

Furthermore, in the second embodiment, the facsimile apparatus must respond by generating a ring signal and detecting a ring trip, which complicates the control procedure of the control unit 76.

Therefore, as a third embodiment, a communication device for starting a communication device such as a facsimile machine without using a high-voltage, low-frequency calling signal will be described.

FIG. 10 is a block diagram showing the configuration of a communication device according to a third embodiment.

In FIG. 10, the reference numeral 71 is a switching device corresponding to the reference numeral 88 in FIG.
is omitted, and instead, a relay 79 (RL3) is provided on the facsimile device 82' side for sending a contact point for transmitting the transfer of line connection in the manual call receiving mode. The other configurations are the same as those in FIG. 7. Although the ROM 76a is provided separately from the control section 76' in FIG. 10, it may be provided in the control section 76 as in FIG.

The facsimile device 82' is almost the same as the conventional device, including a control section 96 that controls the operation of the entire device, an image input section 97 consisting of a printer and an image scanner, an image communication processing section 95 consisting of an encoding/decoding circuit, etc., and a modem section. 93,
It consists of a dialing circuit 92 and an incoming call detection circuit 94 for automatically calling the other station.

The configuration and operation of the components other than the incoming call detection circuit 94 are exactly the same as those of the conventional device. Facsimile machine 82'
Unlike in FIG. 7, a four-wire connection cable 90 connects the switching device 71 and the switching device 71.

This connection cable 90 is constructed from a known cable having a modular jack or the like at both ends.

In reality, such a cable often has six signal lines (two of which are connected between the DC loop detection circuit 74 of the switching device 71 and the relay RL4 on the facsimile machine 82' side). use

The remaining two wires are used for sending contacts of relay 79 of switching device 71.

Relay RL4 switches the incoming and outgoing calls of the facsimile machine 82', and is connected to the DC loop detection circuit 74 of the switching device 71.
A dialing circuit 92 or an incoming call detection circuit 94 is connected to the terminal.

In the normal automatic reception state, relay RL4 is connected to the incoming call detection circuit 94 side, and when a call is commanded from the facsimile machine side by a predetermined operation, relay RL4 is connected to the dialing circuit 92 side.

The incoming call detection circuit 94 of the facsimile machine 82' is connected to the relay R.
Detects a calling signal input via L4. As in the past, the incoming call detection circuit 94 includes a capacitor that extracts only the alternating current component of the line, a photocoupler for detecting a 16Hz calling signal, and a photocoupler that converts the output of this photocoupler into a pulse signal of a predetermined time width with a predetermined logical value. It consists of a converting mono-multivibrator, etc., and outputs a pulse signal when a calling signal is detected.

This detection pulse signal is input to the control section 96 of the facsimile machine 82' via the OR gate 94a. The OR gate 94a also receives a contact signal input via the cable 90. Specifically, one of the sent contacts is pulled up to the power supply voltage, and this level is used to turn on/off the contact.
The connection is made so that the signal is applied to the OR gate 94a depending on the off state.

In this way, the incoming state can be notified to the facsimile machine 82' by the contact state of the relay RL3 without generating a low-frequency, high-voltage calling signal from the switching device 71 side.

Next, the operation of the above configuration will be explained in detail.

FIG. 11 shows the control procedure of the control section 76' of the switching device 71 stored in the ROM 76a.

In FIG. 11, the same parts as in the procedure of FIG. 8 are denoted by the same reference numerals, and the explanation of these parts will be omitted. The procedure in FIG. i1 is different from that in FIG. 8 in steps SJ8 to S50 surrounded by broken lines, and these steps A1□ correspond to steps 328 to S30 in FIG.

If the switching device 71 is in the f-mode call reception mode, manual reception is performed using the telephone 75 in the same manner as in FIG.
If the operator determines in step S26 that it is facsimile communication, the transfer key 78 is pressed in step S27. As a result, the control unit 76' moves to step 848, and
-79 (RL3) is activated.

The operation of the relay 79 is such that an incoming call detection signal, which is the same as when a calling signal is input from the line, is given to the control unit 9G via the OR gate 94a. This allows facsimile device 8
The control unit 9G of 2' starts the incoming call operation. In this case, since the facsimile machine 82' forms a W current loop by a circuit not shown, this DC loop is detected by the DC loop detection circuit 74 in step S49.

In response to the detection signal of the DC loop, the "r' control unit 76' moves to step S50, restores the step 1 node 79 to the normal state, moves to step 3311, and similarly to the procedure of FIG. 8, relays RLI, Telephone line 72 is connected to facsimile machine 82' by RL2.

Thereafter, facsimile communication is performed from step S32 onwards.

When making a call from the facsimile machine side, the facsimile machine 82' forms a DC loop in response to a predetermined key operation.
The control unit 76' detects the relay RLi,
The telephone line 72 is connected to the facsimile machine 82' via RL2.
Performs control to switch to the side. As before, the termination of communication is determined based on the presence or absence of a DC loop.

When the automatic transmission/reception mode in which the telephone line is always connected to the facsimile machine 82' is set by the switch key 77, the telephone line 72 is always connected to the facsimile machine 82' via the R1, R1,1. This enables automatic facsimile transmission and reception at all times even when the operator is away.

As described above, it is possible to notify the facsimile machine 82' of an incoming call by sending contacts without using the same ringing signal as the line, so the processing circuit that handles high voltage and low frequency can be omitted from the switching device 71, and the The structure can be simplified, made smaller and lighter, and its power consumption can be reduced3. Furthermore, since the number of high voltage elements can be reduced, costs can be reduced.

Further, the modification of the facsimile machine @82' side is only minor, such as adding an OR gate to the incoming call detection circuit 94, and does not increase the cost of the facsimile machine 82'.

In the above description, the incoming call is notified by sending a contact from the switching device 71 to the facsimile machine 82', but this incoming signal may be transmitted using a photocoupler or the like.

By sending signals in an insulated state using contact sending or a photocoupler as described above, malfunctions in incoming call detection due to common mode noise can be avoided.

Further, in the above embodiment, the line accommodated by the switching device 71 is a general telephone line, but the switching device 71 is provided in a dedicated telephone such as a key telephone device, that is, in the part of the private telephone network. It is also possible to implement configurations. It goes without saying that the communication device connected to the 61-phone machine is not limited to a facsimile machine, but may also be a data terminal.

As described above, according to the third embodiment, communication equipment can be activated without using the same high voltage, low frequency calling signal as the line, and the number of circuits that handle high voltage, low frequency signals can be reduced. The configuration can be made simple, inexpensive, small and lightweight. Further, since the incoming call detection signal for activating the communication device is input to the communication device in an insulated state, malfunctions of the communication device can be eliminated. Additionally, modifications to the communication equipment side are minimal and can be implemented at low cost.

Next, as a fourth embodiment, a communication device that simplifies the effort and configuration of connection when a data communication device (for example, a facsimile device) is connected to a line via the communication device will be described.

FIG. 12 is a block diagram showing a schematic configuration of the fourth embodiment, in which the same components as in FIG. 6 are denoted by the same numbers.
Detailed explanation will be omitted.

In FIG. 12, a dedicated extension telephone 101 is provided as an extension telephone, and an attached telephone (general telephone) 65 of the facsimile machine 64 is omitted. The line output terminal (T terminal) for connecting the facsimile device W64 with the general attached telephone 65 is connected to the dedicated extension telephone 101, and from the point of view of the facsimile device 64, it is almost the same as connecting a general telephone. The structure is as follows.

Specifically, the T terminal is a two-wire line connection terminal, and when the facsimile machine 64 is activated, the telephone 101 forms a DC loop in the connection line (DC loop forming line). Further, this telephone 101 is a telephone compatible with the standard interface of the main control device 62, and since the main control device 62 is connected to the facsimile device 64, no special interface device or the like is required.

However, the facsimile device 64 used in this embodiment
is a device in which it is possible to switch between manual and automatic calls, and when making a manual call, the call is made by inputting a telephone number key from an attached telephone connected to the facsimile machine 64. In this case, the same call processing can be performed by inputting the telephone number key of the dedicated extension telephone 101 instead of the attached telephone.

In the case of automatic dialing, a DC loop is formed in the telephone line 68 to request the telephone 101 to make a call, connect the telephone line 68 and the telephone line 66, and the main controller 62 disconnects the telephone line 66. 1i161, facsimile device 6
The telephone number signal etc. from 4 may be configured to be sent directly onto the outside line 61.

The detailed configuration of the dedicated extension telephone 101 of the fourth embodiment is shown in the thirteenth embodiment.
As shown in the figure.

In FIG. 13, 121 is a communication circuit, and the communication line 6
6, and transmits the audio signal etc. from the transmitter/receiver 122 onto the communication line 66.
At the same time, audio information from the telephone line 66 is output to the handset 122. 123 is a DC supply circuit that outputs a ringing signal to the facsimile device 64 when a facsimile communication is received, and supplies DC loop monitoring and a ringing signal generation circuit for calling the facsimile device 64; 124 and 125 are DC loop monitoring circuits; circuit, and the DC loop monitoring circuit 124
The DC loop monitoring circuit 125 monitors the formation of a DC loop to the communication line 68 during facsimile communication including when the facsimile machine 64 makes an automatic call, and the DC loop monitoring circuit 125 monitors the formation of a DC loop to the communication line 68 by the DC loop forming circuit 126. This is a circuit to detect that it has been formed by itself. 1
27 is a telephone number key, and a facsimile device 64 is connected to a telephone line 6.
An operation unit 128 is a control circuit that controls the entire telephone according to key inputs from the operation unit 127 and control signals from the control line 67.

Further, 129 indicates whether the telephone line 66 is connected to the telephone circuit 121 (used as a telephone) or whether the facsimile device 64 is
A relay circuit 130 is a hook switch that detects on-hook/off-hook of the handset 122.

The facsimile transmission control of the fourth embodiment having the above configuration will be explained below with reference to the flowchart of FIG.

First, in step S1, set the original to be sent on the facsimile machine N64, and in step S2, pick up the handset 122 (
(off-hook) to form a DC loop in the communication line 66.

The main controller 62 detects this DC loop, determines that it is a call request from the dedicated extension telephone 101, seizes the vacant telephone line (external line), forms a DC loop, and connects the central office equipment of the telephone network. Make a connection request to a certain switching device.

When multiple outside lines are connected to the main controller 62,
One of the external lines may be selected using the operation 1 selection key 1270 times. Note that a configuration may also be adopted in which a change in the state of the telephone 101, such as off-hook, is detected by the control circuit 128 and sent to the main controller 62 via the control line 67.

Subsequently, in step S3, the telephone number of the destination facsimile machine is input using the telephone number key of the operation section i27. The input information of the operation 1 injection unit 127 is the control circuit 1
28 and sent to the main controller 62 via a control line 67. The main controller 62 generates a corresponding telephone number 4 call according to the telephone number rekey input information sent via the control line 67 and sends it to the captured outside line 61.

Various signal tones from the outside line during this series of call processing are relayed by the royal telephone station MB2 and can be heard on the handset 122 of the private extension telephone 101 via the 7.63 telephone line.

Then, in step S4, the call destination device waits for a response.

The central office switching equipment that receives the telephone number signal selects the connection line of the telephone or device specified by the telephone number, calls the other party, and waits for the other party to answer.1 When the other party answers, the main control The device 62 uses the control line 67 to notify the other party's response, and at the same time, a communication path is formed with the other party's device, and the communication becomes possible. As a result, step S4
J: Proceed to re-step S5 and input a switch key instructing switching of the operation unit 127 to the facsimile machine 64. When this key is input, the control circuit 128 operates the DC loop forming circuit 126 in step S6, and T
A DC loop is formed between the terminals and the relay circuit 12
9 is activated and the communication lines 66 and 68 are connected, and the start button of the facsimile machine can be pressed. As a result, the facsimile machine 64 is connected to the telephone line 68 by pressing the start button of the facsimile machine as a call request from the attached telephone (omitted in this embodiment).

Then, in step 87, the user presses the star key of the facsimile machine 64 with which communication is to be performed. The facsimile machine 64 forms a DC loop in the communication line 66 within itself, and connects the communication line 66 to its own side. For this reason, step S
At step 8, the facsimile machine 64 disconnects the DC loop forming line 100 and checks whether it is connected to the communication line 66. When the DC loop monitoring circuit 125 detects that the DC loop forming line 100 is cut off and the DC loop is opened (when the facsimile device 65 starts facsimile communication), the process proceeds from step S8 to step S9, and the DC loop forming circuit 126 is deenergized. .

Thereafter, necessary facsimile communications are performed.

When the facsimile communication ends, the facsimile machine 64 opens the DC loop formed in the communication line 68 to open the line. Therefore, in the control circuit 28, step S
At step 10, the DC loop monitoring circuit 124 waits for detection of the DC loop opening.

When the DC loop is opened and the end of communication is detected, the process proceeds to step Sll, where the S1NO 129 is restored, the communication line 66 and the communication line 100 are disconnected, and the communication line 6G is connected to the communication circuit 121 side.

In the subsequent step 312, it is determined whether or not the hook switch 130 is in an off-hook state, in which the hook switch 130 is in an open state (the handset is placed), and the state of the hook switch 13 () is transmitted to the main control device 62, and the process ends.

If the main controller 62 is on-hook, it opens the DC loop formed on the outside line 17 and restores the line, and if it is off-hook, it maintains the talking state, and after notifying the on-hook state of the telephone io 1, J: the line Do I I + ko.

In the above explanation, normally the telephone line 6G is connected to the telephone circuit 1.
Although an example has been described in which a dedicated extension telephone is connected to the 21 side and manual calls and facsimile transmissions are performed using a dedicated extension telephone, the present invention is not limited to the above example. Telephone line 6G to facsimile machine 64
It goes without saying that the facsimile device 64 may be connected to the facsimile device 64 to automatically make and receive calls.

In addition, the DC loop monitoring circuit 125 is always energized,
A configuration may be adopted in which the communication line 66 and the communication line 68 are connected immediately when a DC loop is formed in the communication line 68 from the facsimile machine 64.

In addition, the above explanation has been given for an example in which the exchange control of the extension telephone is performed by a single main controller 62, but in cases where there is only one external line, the main controller may not be configured as a separate main controller. , it is sufficient to use a telephone facsimile adapter that has a network control circuit added to the telephone connected to the facsimile machine 64 to control the network with an outside line, and even in this case, the facsimile machine 64 can be connected to the facsimile machine 64 by operating the telephone.
You can control the communication path to.

An example of such a configuration is shown in FIG.

In FIG. 15, 131 is a network control device that controls the interface with the outside line 61, and 62 is the telephone set 10 shown in FIG.
Telephone units 136 and 137 having the same configuration as 1 are communication lines similar to communication lines 66 and 67 in FIG. 13, respectively.

As explained above (according to the above embodiment), the main controller 6
Since the system configuration is such that the facsimile device 64 is connected to the facsimile device 64 via a dedicated telephone that can be connected as standard equipment to the facsimile device 101, it is possible to make a call (dial) to the facsimile communication partner by operating the telephone number key of the telephone device 101. 64, there is no need to connect a general telephone that cannot be connected with the standard equipment of the main control device, and there is no need to equip a new interface for this general telephone.

After the other party answers the call from the telephone 101, the line can be easily switched to facsimile communication by simply pressing the start button on the facsimile machine.

Furthermore, if the facsimile machine is a tabletop type and is installed on the tabletop, the main controller 62 can be connected to the telephone of the embodiment instead of the dedicated telephone of the facsimile machine and equipped with the network control circuit 131. It is unnecessary, the structure is simple, and a great effect can be obtained in terms of space saving.

Further, by operating the data communication device, it is possible to connect the data communication device to a public line and make a call possible.

As described above, according to the fourth embodiment, a facsimile device can be connected to an extension of an existing telephone control device without adding a special interface circuit.

Further, the calling signal generating circuit (DC) of FIG. 1 is added to the calling signal generating circuit 123 shown in FIG.
/DC converter A1 (polarity inverter), the configuration can be simplified. Hereinafter, as a fifth embodiment, a case will be described in which the calling signal generating circuit shown in FIG. 1 is applied to the calling signal generating circuit 123 shown in FIG. 13.

FIG. 16 shows the detailed configuration of the dedicated telephone 101' of the fifth embodiment.

In FIG. 16, 221 is a communication circuit, and the communication line 6
6 and transmits the audio signal etc. from the handset 222 onto the communication line 66,
At the same time, the voice signal from the telephone line 66 is output to the handset 222.

Reference numeral 223 denotes a calling signal generating circuit (DC/DC converter A and polarity inverter B) shown in FIG. 1, which outputs a calling signal to the facsimile device 64 when a facsimile communication is received, and the details will be described later.

224 is a DC supply circuit for monitoring the formation of a DC loop when the facsimile machine is started up, and a ring trip detection circuit for monitoring whether the facsimile machine has responded to a calling signal.

225 is a DC loop monitoring and dial signal detection circuit;
During facsimile communication, including when the facsimile device 64 makes an automatic call, the formation of a DC loop to the telephone line 68 is monitored and a dial signal is detected. The DC loop monitoring circuit 226 is a circuit for detecting that the DC loop forming circuit 227 has switched from forming a DC loop to the communication line 68 to forming a loop by the facsimile machine itself. 22
8 is a telephone number key, and a facsimile device 64 is connected to a telephone line 66.
It consists of a switching key etc. for connecting to. The operation section 229 is a control circuit that controls the entire telephone according to key inputs from the operation section 228 and control signals from the control line 67.

Further, 230 is a relay circuit for switching whether to connect the telephone line 66 to the telephone circuit 221 (used as a telephone) or to the facsimile machine 64, and 231 is a hook switch linked to on-hook/off-hook of the handset 222. This state can also be monitored by the control circuit 229.

In the above configuration, the control circuit 229 sends a calling signal as shown in FIG. 2 to the facsimile machine 64 when the procedure shown in FIG. 9 is executed. In the fifth embodiment, when facsimile transmission is performed after a manual call is made using the dedicated telephone 101', it is the same as in the fourth embodiment.

In the fifth embodiment as well, as explained in the second embodiment, the frequency and voltage of the ringing signal can be set variably by software3.Next, the dedicated telephone IO1' is set to automatic facsimile reception mode. The facsimile reception control when the facsimile device 64 is set to the automatic reception mode will be described below with reference to the flowchart of FIG.

In step V 5121, a calling signal from the central office exchange arrives on the outside line 61. The main controller 62 detects this and notifies the control circuit 229 of the dedicated telephone 120 via the control line 67 (step 5122). In step 5123, the control circuit 229 executes the procedure shown in FIG. The generating circuit 223 is driven to send an ejection signal to the facsimile machine 64 via the communication line 68. In step 5124, control circuit 229 monitors DC loop monitoring circuit 225 and waits for facsimile machine 64 to respond. When the facsimile machine detects a calling signal and forms a loop on the communication line 68, this is detected by the DC loop monitoring circuit 225 and transmitted to the control circuit 229. In step 5125, the control circuit 229 operates the relay 230 to connect the communication line 66 and the communication line 6.
8 and notifies the main controller 62 of the response of the facsimile machine (54) via the control line 67.In step 8126, the main controller 62 receives the above notification from the dedicated telephone 101' and calls the outside line 61. Sent from the exchange 11
In response to the incoming call signal, the outside line 61 and the telephone line 66 are connected. In step 5127, the central office switch is 1/8 device 62.
In response to the response, the calling signal is stopped and the outside line 1 is connected to the calling side line. As a result, a communication bus is formed between the calling facsimile machine and the receiving facsimile machine 64, and necessary facsimile communications are subsequently performed in step 5128. When the facsimile communication is completed, the facsimile machine 64 opens the DC loop formed in the communication line 68 in order to keep the line open. Thereafter, the process proceeds to step SIO in FIG. 14, and the line is restored through the same process as in the manual transmission described above.

In the above explanation, the telephone line 66 is normally connected to the telephone circuit 221 side via the hook switch 231, and the example is for manual calling and facsimile transmission using a dedicated extension telephone, and for setting the dedicated telephone to automatic facsimile reception mode. Although automatic reception has been explained when the facsimile machine is also set to the automatic reception mode, the present invention is not limited to this example, and the present invention is not limited to this example. Of course, the telephone line 6 may be connected to the facsimile machine 64 so that the facsimile machine 64 can automatically make and receive calls.

Further, even if a facsimile machine without a T terminal to which the DC loop forming line 100 cannot be connected is connected, manual/automatic outgoing/incoming calls can be performed.

[Explanation 1] According to the fifth embodiment, without impairing the convenient functions of the dedicated telephone of the key telephone system,
A telephone and a facsimile device can be connected. Further, by downsizing the calling signal generation circuit, a dedicated telephone to which a facsimile machine can be connected can be constructed in a small size. Although the above embodiments have been explained using a facsimile machine as an example of a data communication device, the present invention can be applied to any data communication device (such as telex, telex, etc.) that operates in a mode that is automatically activated by a call signal from a line. .

Further, the present invention is not limited to the embodiments described above, and various modifications are possible.

[Effects] As described above, according to the present invention, the configuration of the device can be simplified,
Furthermore, the generated calling signal can be easily changed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a calling signal generation circuit according to a first embodiment. FIG. 2 is a diagram showing signal waveforms of each main part in FIG. 1. FIG. 3 is a diagram showing the principle of ringing a telephone bell. FIG. 4 is a circuit diagram showing an example of a conventional device. FIG. 5 is a diagram showing main signal waveforms of the circuit diagram shown in FIG. 4. FIG. 6 is a diagram showing a configuration in which a facsimile machine is connected to a dedicated telephone of a key telephone system. FIG. 7 is a block diagram showing the configuration of a communication device according to the second embodiment. FIG. 8 is a flowchart showing the control operation of the control section 76 of the second embodiment. FIG. 9 is a flowchart showing a call signal sending routine. FIG. 10 is a block diagram showing the configuration of a communication device according to a third embodiment. FIG. 11 is a flowchart showing the control operation of the control section 76' of the third embodiment. FIG. 12 is a block diagram showing a schematic configuration of the fourth embodiment. FIG. 13 is a block diagram showing the configuration of a dedicated telephone according to the fourth embodiment. FIG. 14 is a flowchart showing the operation of the fourth embodiment. FIG. 15 is a diagram showing a modification of the fourth embodiment. FIG. 16 is a block diagram showing the configuration of a dedicated telephone according to the fifth embodiment. FIG. 17 is a flowchart showing the operation at the time of receiving a call in the fifth embodiment. A...DC/DC converter, B...
Polarity inversion unit, 16... Ring trip detection circuit, 17... Control circuit. w；hsx w---l knee=-m

Claims (11)

[Claims] (1) Connecting means for connecting a line to a data communication device; Calling signal generating means for generating a calling signal for activating the data communication device; and detecting that the data communication device has responded to the calling signal. and control means for stopping the generation of the calling signal and connecting the line to the data communication device by the connecting means, based on the detection by the detecting means, and further comprising a control means for connecting the line to the data communication device by the connecting means, /DC converter, on/off control means for controlling on/off the output voltage of the DC/DC converter, and polarity switching means for switching the polarity of the voltage controlled on/off. . (2) The control means outputs a control signal for operating the on/off control means and the polarity switching means, and generates a calling signal using the control signal. Communication device described in Section 1. (3) The output timing of the control signal is variable, and the control means can arbitrarily change the frequency of the calling signal by changing the output timing of the control signal. The communication device according to item 2. (4) a connection means for connecting a line to the data communication device; a key input means for inputting dial data of the other party; and a transmission means for transmitting a dial signal corresponding to the key input by the key input means; means for storing an attached telephone connection line of a data communication device and forming a DC loop in the attached telephone connection line; means for sending a calling signal to the data communication device; and the above-mentioned data in response to the calling signal from the calling signal sending means response detection means for detecting a response of the communication device; and control means for causing the connection means to connect the line to the data communication device based on the detection by the response detection means; further, the call signal sending means includes: Communication characterized by comprising a DC/DC converter, an on/off control means for controlling on/off the output voltage of the DC/DC converter, and a polarity switching means for switching the polarity of the voltage subjected to the on/off control. Device. (5) comprising a dial response detection means for detecting whether or not the dialed party has responded to the transmission of the dial signal by the transmission means, and the DC loop is formed based on the detection by the dial response detection means. 5. Communication device according to claim 4, characterized in that the means forms a DC loop. (6) The invention further comprises an instruction means for instructing the data communication device to connect a line, and the call signal sending means sends out a call signal based on the instruction from the instruction means. The communication device according to item 5. (7) The communication device according to claim 6, characterized in that upon detecting a response of the data communication device to the call signal, the transmission of the call signal is stopped. (8) Claims characterized in that the device comprises means for detecting an incoming call from a line, and the calling signal is sent to the data communication device by the calling signal sending means based on the detection of an incoming call from the line. The communication device according to item 4. (9) The communication device according to claim 4, wherein the frequency of the calling signal can be changed by changing the operation timing of the on/off control means and the polarity switching means. (10) having a DC/DC converter, on/off control means for controlling on/off the output voltage of the DC/DC converter, and polarity switching means for switching the polarity of the voltage controlled on/off; A communication device, characterized in that a calling signal of an arbitrary frequency is generated by adjusting the timing of on/off control and the timing of polarity switching of the on/off control means and the polarity switching means. (11) The communication device according to claim 9, further comprising means for adjusting the voltage of the calling signal.