JPH03280694A - Talking device - Google Patents

Abstract

PURPOSE:To simplify the wiring by providing a switching means generating a different signal to a master set to a 1st signal generating means in the different operation of a 1st switch and generating a signal to the master set to a 2nd signal generating means. CONSTITUTION:When a 1st switch 50 is operated, a switching means 156 applies the operation in response to the operating state, a current flows to a 1st signal generating means 142 in response to the operating state and a 1st signal generating means 142 generates a different signal to a master set. Moreover, when a 2nd switch 52 is operated, a current flows to a 2nd signal generating means 146 and a signal to the master set is generated. Thus, only three wires interconnecting 1st-3rd terminals A, B, C are enough between each slave set and an exchange to generate plural signals to the master set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device that performs a call between one base unit and one of a plurality of slave units, and particularly relates to a communication device that performs a call between one base unit and one of a plurality of slave units, and particularly The present invention relates to a device for generating a calling signal for calling a machine.

[Prior Art] As the above-mentioned communication device, for example, U.S. Pat.
There is one such as that disclosed in the specification of No. 744,103. In this communication device, the following three signals are sent from the slave unit to the base unit. The first is a call-in signal for calling the base unit from the handset, and the second is a call-in signal that requests the base unit to be called preferentially when multiple handsets are calling the base unit. priority signal for,
This is a privacy signal indicating that the third base unit is rejecting calls.

In order to generate these three types of signals, a configuration as shown in FIG. 7 is used. In the figure, 2 is a handset, 4 is a switch, and the handset 2 and switch 4 are connected by four lines, E, T, (
z, and the child Ia2 has two changeover switches 6.8. The switch 6 has a contact 6a, which is floating in a normal state, and can be switched to a privacy side contact 6b or a call side contact 6c by operation.

Further, the switch 8 is of a self-resetting type, and its contact 8a is in contact with the call side contact 8b in the normal state, and is switched to the priority side contact 8c during the period of operation.

In the state shown in FIG. 7, if the voltage on the line T is +12V or when the contact 6a of the switch 6 is switched to the call side contact 6c, the voltage on the line T, the contact 8a, the contact 8b, and the contact 6c, contact 6a, current flows through line G, line T
The voltage becomes 0■. The voltage on this line T is supplied via multiplexer 8 to comparator 10 or from +12v to O
Since the voltage has changed to V, the comparator IO generates a call-in signal. Further, when the contact 8a of the switch 8 is switched to the priority side contact 8c in the state shown in FIG.
Voltage V (+12
) V) O) is produced on line T, which is fed via multiplexer 8 to comparator 10, which generates a priority signal. Furthermore, when the contact 6a of the switch 6 is switched to the privacy side contact 6b from the state shown in FIG. 7, the intermediate tap of the primary winding of the transformer 12 of the speaker is grounded, The +12V voltage supplied to the detector 14
Then, the detector 14 generates a privacy signal.

[Problem to be solved by the invention] However, in such a configuration, in order to generate a call-in signal, a priority signal, and a privacy signal, it is necessary to connect wires, E, and T between the exchange 4 and each handset 2. , G wires had to be strung up, and the wiring work was troublesome.
Particularly when there are a large number of slave units 2, there is a problem in that the wiring work becomes extremely troublesome.

An object of the present invention is to provide a communication device that solves the above problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a plurality of slave units, one exchange, and one base unit, and one of the slave units is In a communication device that performs a call by forming a communication path between the base unit and the base unit via the exchange, each handset is connected to a first signal generator connected to a power source via a first signal generating means in the exchange. 1 terminal, a second terminal connected to a power supply via a second signal generating means in the exchange, a third terminal connected to a reference potential point, and between the first and third terminals. the first switch according to the different operating states of the connected first switch.
switching means for causing the signal generating means to generate different signals for the base unit; and a switching means connected between the first and third terminals for causing the second signal generating means to generate a signal for the base unit in response to an operation. 2 switches.

[Function] According to the present invention, when the first switch is operated, the switching means performs an operation corresponding to the operating state, current flows to the first signal generating means according to the operating state, and the first Each of the signal generating means generates a different signal to the base unit. Furthermore, when the second switch is operated, current flows through the second signal generating means and generates a signal to the base unit. Therefore, according to the present invention, the connection between each slave unit and the exchange is as follows.
Even though there are three wires connecting the first to third terminals, it is possible to generate a plurality of signals to the base unit.

[Embodiment] FIG. 2 is a schematic block diagram of an embodiment in which the present invention is implemented in a communication device for communicating between a staff room and each classroom in a school, etc. In the figure, 20 is, for example, Master units placed in the staff room, such as the control station, 22, 22, . This is an exchange for forming a communication path with one of them.

The exchange 24 includes a plurality of line units 26, 26...
..., and each line unit 26 is connected to one control station 20 and a plurality of room stations 22, for example, 15 room stations 22, and each line unit 26 is connected to the control station 20 connected to itself. 20 and one of the plurality of room stations 22 connected thereto. In addition, by interconnecting the line units 26, it is possible to connect the control stations 20 connected to different line units 26, or between the control stations 20 and room stations 22 connected to different line units 26. It is also possible to form a communication path between them.

28 is a central office line/tie line unit, and there are multiple units, for example, 9
It has a tie line function for connecting the standby exchange 24 and a C10 line function for making outside calls.

30 is a control unit that controls each line unit 26 and the station line/
It controls the tie line unit 28 and also controls basing and time signals.

32 is a power supply unit, a control unit 30, a central office line/tie line unit 28. A power transformer unit 34 for supplying power to the line unit 26 is connected to the power supply unit 32.

FIG. 3 is a block diagram of the communication path system of this embodiment. As is clear from the figure, the room station 22 has a speaker 36 that also serves as a microphone and a handset 38, and this handset 38 has a receiver 40 and a handset 38. It includes a transmitter 42, a hybrid circuit 44, and a hook switch 46.

Furthermore, the room station 22 has a switch panel 4
The switch panel 48 includes a call-in switch 50, a privacy switch 52, and a paging circuit 54. This switch panel 48 will be described later.

The control station 20 also includes a receiver 56 and a transmitter 58 provided on the handset, and a speaker 60 and a micro 2 provided independently.

The audio signal from the transmitter 58 or the microphone is supplied to the amplifier 64 via the hook switch 63, where it is amplified, and then the carrier wave is FM-modulated in the FM modulation circuit 66. This FM modulated wave is supplied to the AM modulation circuit 68,
The signal is AM-modulated according to a tire signal generated by the control circuit 72 in response to the operation of the keyboard 70, and is supplied to the hybrid circuit 76 via the bandpass filter 74. On the other hand, the audio signal from the room station 22 supplied from the hybrid circuit 76 is supplied to the receiver 56 or the speaker 60 via the hook switch 63.

The control station 20 includes a line unit 26
The communication path switch 80 is connected to the communication path switch 80 via a control station circuit 78 within the control station circuit 78 . Further, each room station 22 is connected to a communication path switch 80 via a line relay circuit 82, a talk hack circuit 84, and a staff handset circuit 86 in the line unit 26. Then, a communication path switch 80 and a line relay circuit 82
etc. by controlling by the control unit 30,
A communication path is established between one of the room stations 22 and the control station 20.

Further, the office line/tie line unit 28 includes a communication path switch 88, an office line communication circuit 90, a tie line communication path switch 92, and a tie line communication circuit 94, and the control unit 3
0 has a communication path switch 96 and a signal tone generating circuit 98, but since these have no direct relation to the gist of the present invention, further explanation will be omitted.

FIG. 4 is a detailed block diagram of the line unit 26.
The signal from the control station 20 is demodulated into an audio signal by the FM demodulation circuit 106 via the power supply circuit 100 of the control station circuit 78, the hybrid circuit 102, and the high-pass filter 04. The signal is supplied to switch 80. This audio signal is amplified by the power amplifier 110 of the talk hack circuit 84 and supplied to the audio switch 112. If the room station 22 or hunt cellar 1 to 38 with which you are trying to make a call is not turned on, the output of the off-hook detection circuit 114 will cause the audio switch 112 to connect the power amplifier 110 and the off-hook detection circuit 114. The audio signal is then supplied to the audio switch 116 via the off-hook detection circuit 114. This audio switch 116 is normally connected to the line relay circuit 82.
When the voice detection circuit 118 detects that the line relay circuit 82 and the AGC circuit 117 (described later) are connected or that a voice signal is being supplied from the communication path switch 80, the line relay circuit 82 and the off-hook detection circuit 114 are connected. The audio signal being supplied to the audio switch 116 is then supplied to the line relay circuit 82. The line relay circuit 82 includes each relay 821.822...82n
(These are provided so as to correspond to each room station.) Out of these, the audio signal from the audio switch 116 is transmitted to a predetermined room station 22 via the one that is closed by the control unit 30. Supplied. In addition, in FIG. 4, each relay 821, 822, . Each consists of two relays.

On the other hand, the audio signal from the predetermined room station 22 is supplied to the AGC circuit 117 via the closed relay and audio switch 116, and the off-hook detection circuit 11
The signal is supplied to the communication path switch 80 via the audio switch 120, which is closed by the output of 4, and is then supplied to the control station 20 via the low-pass filter 122, the power amplifier 124, the hybrid circuit 102, and the power supply circuit 100. Ru.

Additionally, when the handset 38 is lifted, the audio signal supplied from the control station 20 to the call path switch 80 is amplified by the amplifier 126 in the staff handset circuit 86 and is supplied to the audio switch 112 via the hybrid circuit 128. Since the audio switch 112 is switched to the hybrid circuit 128 side by the output of the off-hook detection circuit 114 that detects that the handset 38 has been lifted, the audio signal from the hybrid circuit 128 is not a voice signal. The signal is supplied to an audio switch 116 via a switch 112 and an off-hook detection circuit 114. As described above, this audio switch 116 is switched to the off-hook detection circuit 114 side by the output signal of the audio detection circuit 118 (a signal that detects that an audio signal is being supplied to the communication path switch 80 from the control station 20 side). Therefore, the predetermined room station 2 is connected via the line relay circuit 82.
2.

Also, the audio signal from the room station 22 is transmitted to the line relay circuit 82. The signal is supplied to the amplifier 130 via the audio switch 116, off-hook detection circuit 114, audio switch 112, and high frit circuit 128, where it is amplified and then supplied to the audio switch 132. This audio switch 132 is supplied with the output signal of the off-hook detection circuit 114 inverted by an inversion circuit 134, and is closed when the handset 38 is lifted.

The output of amplifier 130 is therefore provided to channel switch 80, which in turn is provided to control station 20 as described above.

Also, each relay 821, 822 of each line relay circuit 82
. . . 82n includes call-in/privacy signal detection circuits 136I, 1362 . . . 136n, respectively.
Or is provided. These call-in/privacy signal detection circuits 1361, 1362...136n,
Latch circuit 138 responsive to signals from control unit 30
The call-in signal or privacy signal is sent to either room station 2.
2 is being sent, it is supplied to the control unit 30 via the scan data bus 139. Similarly, dial detection circuit 140 within control station circuit 78
are sequentially scanned by the signal from the latch circuit 138,
If a dial signal is being sent from any room station 22, it is supplied to the control unit 30 via the scan data bus 139.

FIG. 1 is a detailed block diagram of the paging circuit 54, handset 38, and respective call-in/privacy circuits in accordance with the subject matter of the present invention. Note that there are a total of n call-in/privacy circuits 1361 to 136n, all of which have the same configuration, so only the call-in/privacy circuit 1361 is shown in FIG. The calling circuit 54 has four terminals A, H, B, and C, and the terminal A is connected to the relay 8218 of the line relay circuit 821 which actually consists of two relays 8218 and 821b. In the normal state, this relay 821a connects the terminal A to the photocoupler 142 side for detecting a call-in signal, and when the control unit 30 connects the first room station 22 and the control station 20, the transmission line 1
Connect terminal A to the 44 side. Terminal B is also connected to relay 821b of line relay 821. In the normal state, this relay 821b connects the terminal B to the photocoupler 146 side for privacy detection, and when connecting the control unit 30 or the first room station 22 and the control station 20, the terminal B is connected to the transmission line 148 side. Connect. Terminal H is connected to control circuit 15 via resistor 150.
2 and the first input of this control circuit 152.
A call-in switch 50 is connected between the input of the terminal A and the terminal A. This call-in switch 50 is a self-return type normally open switch. The first of this control circuit 152
A resistor 153 is connected between the input and terminal C, and terminal C is grounded. Further, the terminal B is connected to the second human power of the control circuit 152, and this second human power is connected to the terminal C via the privacy switch 52 and the light emitting diode 154. This privacy switch 52 is a normal open/close switch. Further, the output of the control circuit 152 is supplied to an oscillation circuit 156. This oscillation circuit 156 is connected in series with a light emitting diode 158 between terminals A and C.

Specifically, the control circuit 152 and the oscillation circuit 156 are
Constructed as shown in the figure, when the call-in switch 50 is momentarily closed, it sends a signal to either the control circuit 152 or the oscillation circuit 156, activating it. That is, in the state shown in FIG. 1, +V voltage is applied to the terminals A and H via the photocoupler 42.146 and the relay 8218.821b, and the call-in switch 50 is momentarily closed, thereby controlling the control. A gate current is applied to the thyristor 160 in the circuit 152 to make it conductive.

At this time, a base current flows through the transistor 162, and the transistor 16 forming an astable multivibrator
The emitter of 4.166 is grounded and the astable multivibrator starts operating. At this time, since +V is applied to the terminal B, the transistor 168 also becomes conductive, and the transistor 170 becomes non-conductive. Therefore, the light emitting diode 158 blinks, and the current flowing through the photocoupler 142 accordingly becomes intermittent as shown in FIG. 6(a).

The reason why a large amount of current flows at the moment the call-in switch 50 is closed, as indicated by the symbol a in FIG. 6(a), is because current flows through the resistor 153 only during this period.

When the call-in signal is supplied from the photocoupler 142 to the control unit 30 in this way, the corresponding control station 20 receives the ring tone and the room station 2.
The number 2 is output, and the control station 20 responds by lifting the handset or pressing the keyboard 7.
Press the PTT switch located inside 0. ), the control unit 30 switches the relays 8218 and 821b to the transmission lines 144 and 148, respectively. As a result, +V voltage is applied to the terminal A via the winding of the transformer 170 of the off-hook detection circuit 144 and the line relay 821a, and a current flows through the light emitting tie 158, the oscillation circuit 156, and the terminal C, causing light to be emitted. The tie auto 158 continues its blinking operation. Furthermore, since the line relay 821b is switched, the voltage at the terminal B decreases from +V to o■, and the transistor 168 shown in FIG. 5 becomes non-conductive. Therefore, no current flows through the iris register 160, the transistor 162 becomes non-conductive, and the astable multivibrator stops. However, since the transistor 168 becomes non-conductive, the transistor 170 becomes conductive, and current flows through the light emitting diode 4158 and the transistor 170, and the light emitting diode 158 changes from a blinking state to a lighting state. This allows the room station 22 to know whether a communication path has been established with the control station 20.

A communication path is thus formed, a communication is made, and when the communication is completed, the control unit 30 controls the communication switch 80 and the line relay circuit 82. As a result, relay 8
21a and 821b connect terminals A and B to photocoupler 1, respectively.
By switching to connect to the 42.146 side, the voltage at terminal B changes from OV to +V.

The transistor 168 shown in FIG. 5 becomes conductive, the transistor 170 becomes non-conductive, the light emitting switch 158 goes out, and the room station 22 knows that the call has ended.

Furthermore, when the call-in switch 50 is continuously closed in the state shown in FIG. Current flows through switch 50 and resistor 153. As a result, during the period when the call-in switch 50 is continuously closed, as shown in FIG.
In addition to this, while current is flowing through the astable multivibrator, its operating current is superimposed on the above current as shown by symbol C. Therefore, a current of a certain value or more flows through the photocoupler 142 while the call-in switch 50 is continuously closed, and the control unit 30 detects this. ,
For example, if it continues for three seconds or more, the control unit 30 determines that a priority signal is being generated.

Note that when the handset 38 is lifted, the switch 46b of the hook switch 46 of the handset 38 is closed, and the photocoupler 142, line relay 821a, terminal A1. Switch 46b, calling circuit 54
A current flows through the terminal H1 resistor 150, 153 and the terminal C, a gate current flows through the thyristor 160 of the control circuit 152, the oscillation circuit 156 operates as described above, the light emitting diode 158 blinks, and a current flows through the photocoupler 142. Current flows intermittently. Incidentally, FIG. 6(b) shows the current flowing through the photocoupler 142 at this time, or here, as shown by the symbol d, a minute current always flows through the resistor]5.
This is because the current continues to flow at 0.153. If the threshold value of the photocoupler 142 is set larger than the above-mentioned minute current, a current will essentially intermittently flow through the photocoupler 142, and the control unit 30 will detect this as a call-in signal. , outputs the ring tone and the number of the room station 22 to the corresponding control station 20, and responds by operating the control station 20 (lifting up the handset or using the keyboard 70).
Press the push button. ), line relay 821
When switching between a and 821b, the off-hook detection circuit 14
4 from the winding 170a of the transformer 170 to the line relay 82
1a, terminal A1 light emitting tie auto 158, oscillation circuit 156
, and the terminal C, and the terminal A1 of the handset 38, the hybrid circuit 44, and the selector switch 46a of the hook switch 46 (this is when the handset 38 is lifted up, the high frit circuit 4 is switched from the speaker 36 side
It has been switched to the 4th side. ), line relay 821b, transmission line 148, winding 170b of transformer 170, resistor 17
1. Flows through the photocoupler 172. Photocoupler 172
As a result of the current flowing through the handle, it is detected that the handle has been lifted. Further, the voltage at the terminal B has decreased from +V to a voltage drop due to the resistor 171 and the photocoupler 172 at this time, so the light emitting lamp is turned on as described above.

Next, in the state shown in Figure 1, when the privacy switch 52 is closed, the photocoupler 146 and relay 82
1 b, terminal B, privacy switch 52, light-emitting tie auto 154, current flows to terminal C, light-emitting tie auto 1
54 is lit, and the room station can see that a privacy instruction is being given. On the other hand, as shown in FIG. 6(d), a current continuously flows through the photocoupler 146, and when the control unit 30 detects this, the control unit 3o can tell whether a privacy request has been made. .

In the above embodiment, an intermittent signal is generated as a call-in signal, and a signal that continues with a current of a predetermined value or more is generated as a priority signal, or a current of a predetermined value or more flows as a call-in signal. A signal may be generated, and an intermittent signal may be generated as a priority signal. Further, in the above embodiment, the photocoupler 142
．． 146, or an impedance element such as a resistor may be used in place of these.

[Effects of the Invention] As described above, according to the present invention, although it is possible to generate a plurality of signals such as a call-in signal, a privacy signal, and a priority signal, the communication between each handset and the exchange is Only three wires need to be laid, which simplifies the wiring work between each slave unit and the switch even when there are a large number of slave units.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an embodiment of a communication device according to the present invention, FIG. 2 is a system configuration diagram of the embodiment, FIG. 3 is a block diagram of the communication path system of the embodiment, and FIG. FIG. 5 is a detailed circuit diagram of the main parts of the same embodiment, FIG. 6 is a timing diagram for explaining the operation of the same embodiment, and FIG. 7 is a diagram of the conventional communication device. FIG. 20...Control station (base unit), 22
...Room station (child unit), 50...Call-in switch (first switch), 52...Privacy switch (second switch), 142...
... Photocoupler (first signal generating means), 146...
... Photocoupler (second signal generation means), 156...
...Oscillation circuit (switching means), A...first terminal, B...second terminal, C...third terminal.

Claims (1)

[Claims] (1) It has a plurality of slave units, one exchange, and one base unit, and a communication path is formed between one of the slave units and the base unit via the exchange. In a telephone communication device for making a telephone call, each slave unit has a first terminal connected to a power supply via a first signal generation means in the exchange, and a first terminal connected to a power supply via a second signal generation means within the exchange. a second terminal connected to a power source at the switch; a third terminal connected to a reference potential point; switching means for causing the signal generation means to generate different signals for the base unit; and a second switching unit connected between the first and third terminals for causing the second signal generation unit to generate a signal for the base unit in response to an operation. A telephone communication device comprising: a switch.