JPH0349493Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a composite intercom device consisting of a base unit, an indoor unit, and a handset, and in particular, the communication path with the handset is closed unless the handset responds within a predetermined time after a call from the handset. This invention relates to a composite intercom device that blocks and prevents indoor sounds from being transmitted to slave units.

In conventional composite intercom devices, when the call button is pressed on the handset, the calling circuit in the base unit activates the buzzer oscillator to produce a ring tone, and the base unit picks up the handset to communicate with the slave unit. A communication path is now established.

However, in the case of a call between the base unit and the indoor unit, if you pick up the handset on the base unit, at the time you pick it up, it will be in a conversation state with the slave unit, and the sound on the base unit will not be heard until you press the indoor unit call button. There is a problem with outputting to the slave unit.

The present invention was developed in view of the above-mentioned difficulties. By providing a time-limited circuit in the call control circuit that establishes a communication path between the base unit and the handset, a call with the handset can be made only after receiving a call from the handset. To provide a composite type intercom device which is activated only when a handset is picked up within a predetermined time, thereby preventing indoor sounds from being unnecessarily output to a handset.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

As shown in the drawings, the present invention has a base unit, an indoor unit, and a slave unit, and is configured such that calls between the slave unit and the indoor unit are conducted via a communication path between the slave unit and the base unit. ing. In the main unit, the transistor
Tr ₁ , low resistance R ₁ , R ₂ , R ₂₄ , diode D ₆ , and capacitor C ₄ constitute a calling circuit 1 that operates a calling oscillator BZ in response to a call from a handset, and the collector of the transistor Tr ₁ is It is connected to the + power supply via a low resistor R ₂₄ and to the call oscillator BZ via a diode D ₆ and a capacitor C ₄ . The emitter is connected to the - power supply, the base is connected to the emitter via resistor _R2 , and to the + power supply via resistors _R1 and _R8 .

Transistors Tr ₉ , Tr ₁₀ , diodes D ₇ , D ₈ ,
Resistors R ₂₇ , R ₂₈ , R ₂₉ , R ₃₀ , R ₃₁ , R ₃₅ and capacitor C ₆ are operated by the paging circuit and set a time limit for establishing a communication path with the handset for a predetermined period of time. A monostable multi-circuit acting as circuit 2 is constructed, and the collectors of transistors Tr ₉ and Tr ₁₀ are connected to the + power supply via resistors R ₃₁ and R ₃₅ , respectively, and the emitters of both transistors are connected to the - power supply. transistor
The base of Tr ₉ is connected to the collector of transistor Tr 10 through a low resistance resistor R ₂₉ , through _the capacitor C ₆ , and the base of transistor Tr ₁₀ is connected to the transistor through a resistor R ₃₀ .
Connected to the collector of Tr ₉ . Also, transistor
The base of Tr ₉ is connected to the collector of the transistor Tr ₁ via a resistor R ₂₇ and a diode D ₇ .
Both ends of resistor R ₂₉ are connected with low resistance R ₂₈ and diode D ₈ respectively.
It is connected to the emitters of transistors Tr ₉ and Tr ₁₀ via.

Transistors Tr ₂ , Tr ₃ , Tr ₄ , diode D ₁ ,
Resistors R ₃ , R ₄ , R ₅ , R ₆ , R ₈ , R ₉ , R ₁₀ and capacitor C ₁ are used to establish a communication path with the slave unit when the base unit or indoor unit responds within the predetermined time. A telephone switch circuit 3 that opens and closes is composed of transistors Tr ₂ ,
The collector of Tr ₃ is capacitor C ₁ and resistor R ₈ respectively.
and to the + power supply via diode D ₁ and resistor R ₃ ,
Both emitters are connected to one power source. The base of the transistor Tr ₂ is connected to the emitter through the resistor R ₅ ,
It is also connected to the intersection of the diode _D1 and the resistor _R3 via a resistor _R4 . The collector of transistor Tr ₃ is connected to the base of transistor Tr ₄ via resistor R ₉ . The emitter of the transistor _Tr4 is connected to the output of the amplifier _A1 via a hybrid circuit HYB, and the input of the amplifier _A1 is connected to the microphone _M1 via a capacitor _C3 . The collector of the transistor Tr ₄ is connected to a terminal connected to the slave unit, and is also connected to the intersection of the capacitor C ₁ and the resistor R ₈ via a resistor R ₁₀ .

Transistors Tr ₅ , Tr ₆ , Tr ₇ , Tr ₈ , Zener diode ZD ₁ , diodes D ₂ , D ₃ , D ₄ , D ₅ ,
D ₁₀ , resistance R ₇ , R ₁₁ , R ₁₂ , R ₁₃ , R ₁₄ , R ₁₅ , R ₁₆ ,
R ₁₇ , R ₁₈ , R ₁₉ , R ₂₀ , R ₂₁ , R ₂₂ , R ₂₃ , R ₂₅ ,
_R26 , capacitors _C2 and _C5 constitute a call control circuit 4 that controls the call switch circuit 3, the collector of the transistor _Tr5 is connected to the power supply terminal of the amplifier _A1 , the resistor _R19 , the capacitor _C2 , It is connected to the base of the transistor Tr ₃ via the diode D ₂ and to the collector of the transistor Tr ₂ via the resistor R ₇ . The base of the transistor Tr ₅ is connected to the emitter via resistors R ₁₄ and R ₁₁ , and the emitter is connected to the + power supply. Resistance from the intersection of resistors R ₁₁ and R ₁₄
It is connected to the base of the transistor Tr ₆ via R ₁₂ , R ₁₆ , and the Zener diode ZD ₁ . The collector of the transistor Tr ₆ is connected to the base of the transistor Tr ₈ via a diode D ₄ , a resistor R ₂₂ , and a diode D ₃ and to the base of the transistor Tr ₂ via a diode D ₅ and a resistor R ₂₆ . Also transistor
The collector of Tr ₆ is connected via a resistor R ₂₃ to the call generator BZ, the output of which is connected via a switch F ₁₂ to the handset RC ₁ .
The handset _RC1 is connected to the hybrid circuit HYB by switching the switch _F12 .
The emitter of the transistor Tr ₆ is connected to the base via a resistor R ₁₅ and also to the + power supply.
The intersection of resistors _R16 and _R12 is connected to the -power supply via a switch _F11 and an in-room call switch _S1 . A resistor _R13 is also connected in parallel to the switch _S1 . The intersection of resistors _R12 and _R14 is connected to the base of transistor _Tr7 via resistor _R18 . transistor
The emitter of Tr ₇ is connected to the + power supply via resistor R ₁₇ , and the collector is connected to the base of transistor Tr ₈ via resistor R ₂₀ . The base of the transistor Tr ₈ is connected to the emitter via the resistor R ₂₁ and also to the diode
D ₃ is connected to the power supply together with the emitter via capacitor C ₅ . The collector of the transistor Tr ₈ is connected to the intersection of the resistor R ₁₉ and the capacitor C ₂ and to the collector of the transistor Tr ₁₀ via a diode D ₁₀ . Further, the intersection of the capacitor C ₂ and the diode D ₂ is connected to the - power supply via the resistor R ₂₅ .

Transistor Tr ₁₁ , diode D ₉ , resistor R ₃₂ ,
R ₃₃ and R ₃₄ together with one transistor Tr ₉ of the time limit circuit 2 constitute a holding circuit 5 that stops the time limit operation of the time limit circuit during a call between the base unit and the slave unit or between the base unit and the indoor unit. , the base of the transistor Tr ₁₁ is connected through a resistor R ₂₃ and a diode D ₉ to the collector of the transistor Tr ₉ , and through a resistor R ₃₃ to the emitter of the transistor Tr ₁₁ , which emitter is connected to the collector of the transistor Tr ₅ . connected to. The collector of transistor Tr ₁₁ is a resistor
It is connected via _R34 to the intersection of the resistor _R29 and capacitor _C6 .

The indoor unit has the same circuit configuration, and the microphone
The output of amplifier A ₂ to which M ₂ is input reaches the line via switch F ₂₁ and is further connected to the input of amplifier A ₁ of the base unit and the intersection of low resistance R ₁₆ and R ₁₂ of call control circuit 4. Ru. Further, the output of the amplifier _A2 reaches the line via the room call switch _S2 , and is further connected to the main power source. The handsets RC ₂ are connected to the respective lines via a hook switch F ₂₂ , one of which is further connected to the output of the call oscillator BZ of the base unit, and the other further connected to the output of the hybrid circuit HYB of the base unit and to the hook switch F ₁₂ . The + side of the amplifier A ₂ is connected to the switch F ₂₁ via a resistor R ₅₀ , and the - side is connected to the line connected to the - power supply of the main unit together with the microphone M ₂ and the receiver RC ₂ .

In the circuit of the composite intercom device configured as described above, when the base unit is in the standby state, the transistor Tr ₁ of the calling circuit 1 is biased from the positive power supply via the resistors R ₈ and R ₁ to turn on, and the call switch circuit is turned on. The transistor Tr ₂ of No. 3 is biased from the positive power supply through the resistors R ₃ and R ₄ and turned on, and the transistor Tr ₃ is therefore turned off. In addition, the transistor Tr ₁₀ of the time limit circuit 2 is connected to the resistor from the + power supply.
Biased through R ₃₁ and R ₃₀ and turned on,
Therefore, the potential at point A is at the LOW level via transistor _Tr10 and diode _D10 .
Therefore, when the handset (not shown) is picked up in this state, even if transistor Tr ₅ is turned on by switch F ₁₁ and + bias is applied to point A, point A remains at LOW level, so capacitor C ₂ ,
Since a positive trigger is not applied to the transistor Tr ₃ via the diode D ₂ , the transistor Tr ₃ is not turned on, and the transistor Tr ₄ is not turned on either, so a call with the handset cannot be established.

When there is a call from the handset, current flows to the handset via resistors R ₈ and R ₁₀ , turns off transistor Tr ₁ of calling circuit 1, activates the call oscillator BZ, and the ring tone is transmitted to the parent unit via the switch F ₁₂ . The receiver RC ₁ of the indoor unit is made to ring, and the ring tone also passes through the line and the receiver RC ₂ of each indoor unit is made to ring via the hook switch F ₂₂ . Also, since transistor Tr ₁ is off, resistor R ₂₄ , diode D ₇ , resistor
The transistor Tr ₉ of the time limit circuit 2 is turned on via R ₂₇ , so the transistor Tr ₁₀ is turned off, and the capacitor C ₆ completes charging from the power supply via the resistor R ₃₅ (the charging time is determined by the capacitance of the capacitor C ₆ ). Transistor Tr ₉ is turned on and transistor Tr ₁₀ is turned off until the voltage is determined (determined).

During this time, when the handset is picked up by the base unit, the switch F ₁₁ and F ₁₂ switch, and the transistor Tr ₅ of the call control circuit 4 is biased and turned on via the resistors R ₁₁ , R ₁₂ , the switch F ₁₁ , and the resistor R ₁₃ . In addition to supplying power to amplifier A ₁ , the transistor
A positive trigger is applied to _transistor Tr 3 through Tr ₅ , resistor R ₁₉ , capacitor C ₂ , and diode D ₂ to turn it on (because transistor Tr ₁₀ of time limit circuit 4 is off, A
The point is set to Hi level), and therefore transistor Tr ₄ is biased and turned on to form a communication path between the base unit and the slave unit. Also, when one of the indoor units picks up the handset instead of the base unit, the resistance
Indoor unit switch _F21 via _R11 , _R12 ,
Amplifier A ₂ is activated by resistor R ₅₀ , transistor Tr ₅ of call control circuit 4 of the base unit is turned on, and the amplifier
Activate _A1 to form a communication path between the indoor unit and the slave unit as described above. As mentioned above, when there is a call from the handset and the base unit or indoor unit picks up the handset, the transistor Tr ₅ turns on, but when the transistor Tr ₅ turns on, the resistors R ₃₃ , R ₃₂ , Diode _D9 , transistor _Tr9
Transistor Tr ₁₁ is biased and turned on via. When the transistor Tr ₁₁ is turned on, the transistor Tr ₉ is biased, and both transistors Tr ₉ and Tr ₁₁ form a holding circuit to maintain the off state of the transistor Tr ₁₀ . That is, while the base unit and the slave unit or the base unit and the indoor unit are talking, the time limit operation of the time limit circuit 2 is stopped by the transistor Tr ₁₁ .
The call switch circuit 3 is maintained.

Also, when a predetermined period of time has passed after being called from the handset and capacitor _C6 has completed charging, the transistor
The bias of Tr ₉ disappears and it is turned off, so that the transistor Tr ₁₀ is turned on and the point A becomes LOW level and returns to the standby state. Even if the handset is picked up in this state, the transistors Tr ₃ and Tr ₄ are connected as described above.
If you do not turn it on, a communication path with the handset will not be established.

As is clear from the above embodiments, according to the present invention, when the base unit or indoor unit picks up the handset and responds within a certain period of time after the base unit or indoor unit is called by the slave unit. A communication path is established only with the handset, and a communication path with other handsets is not established.This prevents unnecessary room noise from being generated when talking between the base unit and the indoor unit. You can protect your privacy without having to go out to the handset.

[Brief explanation of drawings]

The drawing is a circuit diagram of the composite intercom device of the present invention. ...Main unit, ...Indoor unit, ...Slave unit, 1...
... Calling circuit, 2 ... Time limit circuit, 3 ... Call switch circuit, 4 ... Call control circuit.

Claims (1)

[Scope of utility model registration request] It has a base unit, a slave unit, and an indoor unit, and a call between the slave unit and the indoor unit is performed through a communication path between the slave unit and the base unit, and a call switch circuit that opens and closes the communication path. 3, a timer circuit 2 that operates for a predetermined period of time in response to a call from the handset, and either a switch F ₁₁ or F ₂₁ that is linked to the handset of the base unit or the indoor unit, respectively. A composite intercom device comprising: a call control circuit 4 that controls the call switch circuit so as to close the call path in response to closing the call path within an operating period.