JPH03280692A - Talking device - Google Patents

Abstract

PURPOSE:To simplify the circuit configuration by providing a self-return switch connected to a power supply in series with a call signal generating means and a means applying a control signal to a switching means in response to the momentary operation of the switch. CONSTITUTION:When a self-return switch 50 is operated momentarily, a control means 152 generates control signal and a switching means 156 repeats interruption. Thus, a current flows interruptingly to a call signal generating means 142 and the switching means 156 and a call signal generating means 142 generates a call signal interruptingly to a master set. Moreover, when the self- return switch 50 is operated continuously, for example, a current flows continuously to the call signal generating means 142 and the self-return switch 50 and the call signal generating means 142 generates a call signal to the master set continuously. Thus, a call-in signal and a priority signal are generated with simple configuration by forming a state to generate the call signal interruptingly and continuously.

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 telephone communication device that performs a call between one base unit and one of a plurality of slave units, and in particular, The present invention relates to a device for generating a calling signal for calling a machine.

[Prior Art] For example, the above-mentioned communication device is disclosed in US Patent No. 4.
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, 3rd
This is a privacy signal indicating that calls from the base unit are being rejected.

In order to generate these three types of signals, a configuration as shown in FIG. 7 is used. In the figure, 2 is a slave unit, 4 is a switch, and the slave Ia2 and switch 4 are connected by four wires, E, T,
The child #i2 has two changeover switches 6.8. The switch 6 has a contact 6a, which is floating in a normal state, and is switched to a contact 6b on the contact side or a contact 6c on the call side when operated.

The switch 8 is of a self-resetting type, and its contact 8a normally contacts the call side contact 8b, and switches to the priority side contact 8C during the period of operation.

In the state shown in FIG. 7, the voltage on the line T is +12V, but when the contact 6a of the switch 6 is switched to the call side contact 6c, the voltage changes from +12V to the line T, contact 8a, contact 8b, and contact 6c. , a current flows through the contactor 6a, the line G, and the line T
The voltage becomes OV. The voltage on this line T is supplied to the comparator 10 via the multiplexer 8, and the voltage from +12V to O
Since the voltage has changed to v, comparator 1° generates a call-in signal. Moreover, 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 and is fed via multiplexer 8 to comparator 10, which generates a priority signal from comparator IO. 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 speaker transformer 12 is grounded, and the The +12V voltage supplied to the detector 14 or Ov
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 and a privacy signal, +1 is required between the lines T and G.
It is necessary to generate a 3mD N pressure ft of 2V, ■, o, and for this purpose, two switches 6.8 must be provided, and the comparator 10 has a value of +12V, ■, or 0. You must use something that can determine if there is a
There was a problem with the structure being complicated.

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 one main unit and a plurality of slave units, and 1. In a communication device that performs a C1 call by forming a communication path between an L base unit and one slave unit, each slave unit has a switching means that repeats on and off in response to a control signal, and a switch connected in series with the switching means. a self-resetting type switch connected to the power source in series with the calling signal generating means; and control means for supplying the control signal to the switching means in response to the instantaneous operation of the switch.

[Function] According to the present invention, for example, when a self-resetting switch is instantaneously operated, the control means generates a control signal, and the switching means repeats the on/off operation. As a result, a current intermittently flows through the calling signal generating means and the switching means, and a calling signal is intermittently generated to the calling signal generating means or the base unit. Further, when a self-reset type switch is continuously operated, for example, a current continuously flows through the call signal generation means and the self-reset type switch, and a call signal is continuously generated from the call signal generation means to the base unit. In this way, it is possible to create a state in which the i-commander is in a state where a call signal is generated and a state in which the call signal is continuously generated, and the above-mentioned call-in code and priority signal are generated. I'll come. In addition, if the self-resetting switch is continuously operated l), the current that was flowing can be stopped and the calling signal generating means can be made to continuously generate the calling signal. .

[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, for example, a school. A master unit placed in a staff room, for example, a control station, 22, 22, etc. is a slave unit placed in each classroom, for example, a room station, 24 is a control station 20, a room station 22, etc. 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 stage machines 22, for example, 15, and each line unit 26 has a control station 20 connected to it. 20 and one of the plurality of room stations 22 connected thereto. In addition, by interconnecting each line unit 26, it is possible to connect between control stations 20 connected to different line units 26, or between control stations 20 and room stations 22 connected to different line units 26. It is possible to form a communication path.

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 exchange 24 up to the terminal, 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 for supplying power to the control unit 30, the office line/tie line unit 28, and the line unit 26; 34 is a power transformer unit 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 is equipped with a transmitter 42, a high-speed relay circuit 44, and a hook switch 46.

Furthermore, the room station 22 has a switch panel 4
8, and this switch panel 48 has call-in switches 50.8. A privacy switch 52 and a calling circuit 54 are provided. 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 micro 2 is supplied to the amplifier 64 via the hook switch 63, where it is amplified, and then the carrier wave is converted to FM in the FM modulation circuit 66.
Modulate. This FM modulated wave is supplied to an AM modulation circuit 68, subjected to AM modulation in accordance with a tire signal generated by the control circuit 7Z in response to the operation of the keyboard 70, and supplied to a high-speed circuit 76 via a band pass filter 74. . On the other hand, the audio signal from the room station 22 supplied from the high frit circuit 76 is transmitted to the hook switch 6
3 to the handset 56 or speaker 60.

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 Stauf-Hunt set 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 shows a detailed 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 height circuit 102, and the bypass filter 104. is supplied to 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 handset 38 with which you are trying to make a call is not raised, 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 signal is provided to audio switch 116 via off-hook detection circuit 114. This audio switch 116 is normally in a state where it connects the line relay circuit 82 and the AGC circuit 117, which will be described later.
When the voice detection circuit 118 detects 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 switched to be connected, and the voice signal being supplied to the voice switch 116 is detected. Supplied to 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. ), and the audio signal from the audio switch 116 is supplied to a predetermined room station 22 through those which are closed by the control unit 30. In addition, in order to simplify the diagram, each relay 821, 822, . Each of these 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 high frit 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. However, since the audio switch 112 is switched to the high flit circuit 128 side by the output of the off-hook detection circuit 114 that detects that the handset 38 is lifted, the audio signal from the high flit circuit 128 is , the audio switch 112 and the off-hook detection circuit 114 to the audio switch 115 . 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 supplied to the amplifier 130 via the line relay circuit 82, audio switch 116, off-hook detection circuit 114, audio switch 112, and high frit circuit 128, where it is amplified and then the audio signal is The signal is supplied to 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.

In addition, each relay 821.822 of each line relay circuit 82
. . . 82n have call-in/privacy signal detection circuits 135], 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, it is supplied to the control unit 30 via the scan data bus 139. Similarly, tire detection circuit 140 within control station circuit 78
are sequentially scanned by the signal from the latch circuit 138,
If a tire 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 outlet passageway 54, handset 38, and respective call-in/privacy circuits in accordance with the subject matter of the present invention. A total of n call-in/privacy circuits 1351 to 136n are provided, but since they all have the same configuration, only the call-in/privacy circuit 1361 is shown in FIG. The calling circuit 54 has four terminals A, H, B, and C.
is actually connected to relay 821a of line relay circuit 821 consisting of two relays 821a and 821b. In the normal state, this relay 821a connects the terminal A to the photocoupler 142 side for detecting a call-in signal,
When connecting the control unit 3° or the first room station 22 and the control station 20, the terminal A is connected to the transmission line 144 side. Terminal B is also connected to relay 821b of line relay 821. This relay 821b normally connects terminal B to the photocoupler 146 side for privacy detection, and connects the terminal B to the transmission line 148 side when connecting the control unit 3 or the first room station 22 and the control station 20. B
Connect. Terminal H is connected to control circuit 1 via resistor 150.
A call-in switch 50 is connected between the first input of the control circuit 152 and the terminal A. This call-in switch 50 is a self-reset 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 tie auto 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 142.146 and the relay 8218.821b, and the call-in switch 50 is momentarily closed, causing the control circuit to close. A gate current is applied to the thyristor 160 in the thyristor 152 to make it conductive.

At this time, a base current flows through the transistor 162, and the transistor 16 forming an astable multivibrator
4. The emitter of 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 tie 158 blinks, and in response to this, the current flowing through the photocoupler 142 also 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 the current flows through the resistor 153 only during this period.

When the call-in signal is thus supplied from the photocoupler 142 to the control unit 30, the corresponding control station 20 receives a ring tone and a room station 22.
number is output, and the control station 20 responds (picks up the handset, but does not use the keyboard 70).
Press the PTT switch inside. ), the control unit 30 switches the relays 821a and 821b to the transmission line 144 and 148 sides, respectively. As a result, terminal A is connected to transformer 1 of off-hook detection circuit 144.
A +V voltage is applied to the winding 70, a line relay 821a, a current is applied to the light emitting tie 158, and the oscillation circuit 1
56 and terminal C, and the light emitting tie auto 158 continues its blinking operation. Also, because the line relay 821b was switched, the voltage at terminal B decreased from +V to ov,
Transistor 168 shown in FIG. 5 becomes non-conductive.

Therefore, no current flows through thyristor 160, transistor 162 becomes non-conductive, and the astable multivibrator stops. However, since the transistor 168 becomes non-conductive, the transistor 170 also becomes conductive, and the light emitting diode 158 and the transistor 1
A current flows through 70, and the light emitting tie 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.
42.146 side, the voltage at terminal B changes from Ov to +V, transistor 168 shown in FIG. 5 becomes conductive, transistor 170 becomes non-conductive, and light emitting diode 158 The light 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 call-in switch 50 and resistor 153. As a result, during the period when the call-in switch 50 is continuously closed, as already 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 during the period when the call-in switch 50 is continuously closed, and this current is passed through the photocoupler 142 to the control unit 30.
is detected, and if this current state of a certain value or more continues for a predetermined period of time, for example, 3 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 of the handset 38, switch 46b, and calling circuit 54 are closed.
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 tie 158 blinks, and the photocoupler 142 Current flows intermittently. Incidentally, FIG. 6(b) shows the current flowing through the photocoupler 142 at this time, but it is through the resistor 15 that a minute current always flows as indicated by the symbol d.
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 a 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 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 A, light emitting diode 158, oscillation circuit 156
, the current flows to the terminal C, and the switch 46a of the hook switch 46 connects the terminal A1 of the handset 38, the hybrid circuit 44, and the hook switch 46.
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
Lifting of the handset 38 is detected by the current flowing through the terminal. - Also, since the voltage at terminal B has decreased from +V to a voltage drop due to resistor 171 and photocoupler 172 at this time, the light emitting diode is turned on as described above.

Next, when the privacy switch 52 is closed in the state shown in FIG.
1b, terminal B, privacy switch 52, light emitting diode 154, and terminal C, current flows to light emitting diode 15.
4 will be lit, and the room station will know 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 by detecting this, the control unit 30 knows whether a privacy request has been made.

In the above embodiment, an intermittent signal is generated as a call-in signal, and a signal with a current of a predetermined value or more or a continuous signal is generated as a priority signal. Alternatively, an intermittent signal may be generated as a priority signal. In addition, when the call-in switch 50 is not operated, a current higher than a certain value is always passed through the oscillation circuit 156, and when the call-in switch 50 is operated momentarily, the oscillation circuit 156 is caused to oscillate, and when it is continuously operated, the oscillation circuit 156 is caused to oscillate. The supply of current to the circuit 156 may be stopped. Further, although the photocouplers 142 and 146 are used, an impedance element such as a resistor may be used instead.

[Effects of the Invention] As described above, according to the present invention, when generating a call-in signal, a switch is operated momentarily, and when generating a priority signal, the same switch is operated continuously. You only need to use one switch. In addition, since the call-in signal or the priority signal is determined by the length of time the current is flowing, a comparison is made to determine which of the three voltages used in the conventional system. There is no need for a container. Therefore,
According to the present invention, it is possible to simplify the circuit configuration.

[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. It is a block diagram. 20...Control station (parent m), zz
...Room station (child unit), 5o...Call-in switch (self-resetting switch), 142...
... Photocoupler (calling signal generation means), 152...
...Control circuit, 156...Oscillation circuit (switching means).

Claims (1)

[Claims] (1) In a communication device that has one base unit and a plurality of slave units, and configures a communication path between the base unit and one slave unit to perform a call, each of the slave units a switching means that repeats on and off in response to a control signal; a calling signal generating means that is connected to a power source in series with the switching means and generates a calling signal to the base unit in accordance with the current supplied from the power source; A telephone communication device comprising: a self-resetting switch connected in series with the power supply to the calling signal generating means; and a control means for supplying the control signal to the switching means in response to an instantaneous operation of the switch.