JPS622844Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intercom, and particularly to an intercom that can block calls from a slave unit at an additional base unit.

Conventionally, as shown in Fig. 1, an entrance handset D is installed at the entrance, a master unit Mo is installed in the kitchen or living room, and additional base units S ₁ , S ₂ , etc. are installed in the study, bedroom, children's room, etc., and calls are made respectively. Intercoms that can perform these functions are known. Therefore, the main unit Mo has the main function of generating a ring tone, and the main unit Mo has the main function of generating a ring tone, and the main unit Mo has _the main function of generating a ring tone _.
The ring tone for ... is also being sent from the base unit Mo.
By the way, there are cases where additional base units S ₁ , S ₂ . be.

The purpose of this invention is to enable the user to independently and easily block the ring tone sent from the base unit in response to a call from the doorway handset on an additional base unit that does not have a main function. On the other hand, even in such a blocked state, the main unit itself calls the additional base unit by providing an intercom that rings from the additional base unit.

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

In Figure 2, the main unit D is placed at the entrance.
Mo is an additional base unit with the same circuit configuration installed in the kitchen and living room.
S ₁ and S ₂ are installed in bedrooms, children's rooms, etc. Main unit
Mo includes a handset call detection unit 10 that is controlled to turn on and off by the call switch SW ₃ of the doorway handset D;
Calling from the base unit to the additional base units S ₁ and S ₂ via the switch switch SW ₁ and the call switch HS ₂ from the additional base unit to the base unit, and from the base switch SW ₄ to the base unit.
The base unit ring detection section 11 is controlled ON and OFF via the HS ₄ , the ring tone generation circuit 12 is activated by either one of the detection sections 10 and 11, and the output of the ring tone generation circuit 12 is controlled. An amplifier 13 for amplification is provided.

The detection unit 10 has a collector that includes a ringing tone generation circuit 12.
and a transistor Tr ₂ whose emitter is connected to the pole of the power supply V through a resistor R ₉ and to the ground line E of the power supply V, and the base of the transistor Tr ₂ is connected to the line d ₁ connecting the parent unit and the slave unit and the ground line. It is connected to the connection point of resistors R ₃ and R ₄ provided between E. Also, the line _d1 is connected to the power supply V through the resistor _R5 .
connected to the pole of

On the other hand, the detection unit 11 consists of a transistor Tr ₁ whose emitter is connected to the pole of the power supply V and whose collector is connected to the ringing tone generation circuit 12, and whose base is connected to the resistor R ₆
is connected to the pole of the power supply V via a resistor R ₇ , a switch HS ₂ and a call switch SW ₁ to an earth line E.

The output side of the amplifier 13 is the volume control 1 of the main unit Mo.
6. To the receiver R ₁ of the base unit Mo via the switch HS ₁ , and to the additional base unit via the call line C.
They are connected to the receiver R ₂ of the additional base unit via the volume controllers 17 and the switch HS ₃ of S ₁ and S ₂ , respectively.

A removable short fitting 14 is interposed between the terminals t ₁ and t ₂ between the output side of the amplifier 13 and the receiver R ₂ of the additional base units S ₁ and S ₂ . Also,
Between the terminals t ₁ and t ₂ , when the short bracket 14 is removed and the terminals t ₁ and t ₂ are cut off, a base unit call detection unit 11 , a hook switch HS ₂ and a base unit call switch SW _{1 are} connected. The terminal t 1 to which the short fitting 14 was connected under switching control through the terminal t ₁ ,
A ringer blocking circuit 15 is interposed to provide conduction between t2 and _t2 .

That is, in the illustrated embodiment, the switching transistor Tr ₃ of the ringer blocking circuit 15 has its emitter connected from the terminal t ₁ to the output side of the amplifier 13 via the capacitor C ₁ and the ringing line C.
The collector is connected from terminal _t2 to receiver _R2 via capacitor _C2 , volume control 17, and switch _HS3 . Further, the collector of the transistor Tr ₁ of the main unit call detection section 11 is connected to the emitter of the transistor Tr ₃ via the receiving line R, the diode D ₁ and the resistor R ₁ . The base of the transistor Tr ₃ is connected to the ground line E through the resistor R ₂ and the diode D ₂ , through the transmission line T, through the main unit Mo's hook switch HS ₂ and call switch SW ₁ , and from the diode D ₂ to the hook switch HS _4. ,
It is connected to the ground line E via the call switch _SW4 . A capacitor C ₃ and a resistor R ₈ are connected between the emitter and base of the transistor Tr ₃ .

In addition, the main unit Mo is a switch HS ₁ , HS ₂ ,
Receiver R ₁ , microphone M ₁ , call signal amplifier 18 , and hybrid circuit 19 make it possible to make a call by operating the handset (not shown) of handset D and channel selection switch SW ₂ , while the additional base units S ₁ and S ₂ switch HS ₃ , HS ₄ , receiver R ₂ , microphone M ₂ ,
The call signal amplifier 20 allows calls to be made to the additional base unit, but since this configuration and operation are not a feature of the present invention, a description thereof will be omitted.

To explain the operation of the intercom configured as described above, the circuit shown in FIG. 2 shows a standby state.

(1) When the short fitting 14 is connected to the terminals t ₁ and t ₂ (a) Call from the doorway handset D When the call switch SW ₃ of the doorway handset D is turned on, the transistor of the call detection unit 10 is activated. The supply of bias from the power supply V to the base of Tr ₂ via resistors R ₃ and R ₄ is stopped, transistor Tr ₂ is turned off, and ring tone generation circuit 12 is activated via resistor R ₉ . The output is amplified by an amplifier 13, passes through a volume controller 16, a switch HS _1, and is emitted as a ring tone from the receiver R ₁ of the base unit Mo. At the same time, it passes through the amplifier 13, the call line C, the short bracket 14, the volume controller 17, and the switch HS ₃ .
The ring tone is emitted from the receiver R ₂ of the additional base units S ₁ and S ₂ .

(b) Indoor call from base unit Mo When base unit Mo picks up the handset (receiver R ₁ , microphone M ₂ ), the switch
By inverting HS ₁ and HS ₂ and making the call switch SW ₁ , bias is supplied to the transistor Tr ₁ of the call detection section 11 from the power supply V via the resistors R ₆ and R ₇ , and the transistor Tr ₁ is turned on.
ON, and the ringing tone generation circuit 12 is activated. The output is amplified by an amplifier 13, a call line C, a short fitting 14, and a volume controller 1.
7. Expansion base unit S ₁ through the main switch HS ₃ ,
The ring tone is emitted from the receiver R ₂ of S ₂ .

(c) Indoor call from additional base unit S ₁ For example, when additional base unit S ₁ is used as a handset (receiver)
When you pick up the microphone (R ₂ , microphone M ₂ ), the hook switches HS ₃ and HS ₄ are reversed, and the call switch is
By making SW ₄ , the transistor Tr ₁ of the call detection section 11 in the main unit Mo changes to the above
Similarly to (b), it is turned on and the call generation circuit 12 is activated. Its output is amplifier 13, volume control 1
6. Passes through the switch HS ₁ and is emitted as a ring tone from the receiver R ₁ of the base unit Mo. In this case, _the call line C passes through the receiver R ₂ of the additional base unit S 2 via the short bracket 14 volume adjuster 17 of the additional base unit S ₂ and the hook switch HS ₃ .
A ringtone is also emitted. Similarly, when a call is made from the additional base unit _S2 , a ring tone is emitted from the base unit Mo and the additional base unit _S1 .

(2) When the short bracket 14 is removed from the extension base unit S ₁ (a) Call from the entrance slave unit D Same as in the case of (1)(a) above, the receiver R ₁ of the base unit Mo and the extension base unit S A ring tone is emitted from receiver R ₂ of _{No. 2} , but since the short bracket 14 of the additional base unit S ₁ has been removed and the terminals t ₁ and t ₂ are cut off, the ring tone is blocked and the additional base unit S 1 is blocked. Machine S ₁
No ring tone is emitted from receiver _R2 .

(b) Indoor call from base unit Mo Similar to cases (1) and (b) above, the ring tone is sent to the additional base unit S ₁ through the call line C, but the short bracket 14 has been removed. Receiver R ₂ of the additional main unit S ₁ via the short bracket 14
does not sound. However, the transistor Tr ₁ of the call detection unit 11 in the main unit Mo
It is ON, and the pole of the power supply V is supplied to the transmission line R via the transistor _Tr1 . Therefore, this pole is connected to the emitter of the transistor Tr ₃ from the line R via the diode D ₁ and the resistor R ₁ of the ringer blocking circuit 15 in the expanded base unit S ₁ . A base current flows from the base of the transistor Tr ₃ through the resistor R ₂ , the diode D ₂ , the transmission line T, the inverted switch HS ₂ , and the made call switch SW ₁ , turning the transistor Tr ₃ ON. Switching controlled ringer blocking circuit 15
is the terminal t ₁ to which the short fitting was connected,
Make conduction between t _{and 2} . As a result, the ringing sound is transmitted not through the route of the short fitting but through the ringing sound blocking circuit 15, that is, the transistor which is in a conductive state.
The sound will be emitted from the receiver R ₂ of the additional base unit S ₁ via Tr ₃ .

(c) Indoor call from additional base unit S ₁ This call is the same as in the case of (1) and (c) above.

(d) Indoor call from additional base unit S ₂ Similar to the indoor call from additional base unit S ₁ in cases (1) and (c) above, a ring tone is emitted from receiver R ₁ of base unit Mo. . For the additional base unit S ₁ , the ringer blocking circuit 1 in the additional base unit S ₁ is similar to the indoor call from the base unit Mo in the case of (2)(b) above.
The transistor Tr ₃ of No. 5 is switched ON, and a ringing tone is emitted from the receiver R ₂ of the additional main unit S ₁ . In this case, the transistor
The base current of Tr ₃ is the main unit Mo's switch
HS ₂ , add base unit S ₂ instead of call switch SW ₁
It will flow through the main switch HS ₄ and the call switch SW ₄ .

In addition, in (2) above, if the expansion base unit S ₂ removes the short bracket 14 and the expansion base unit S ₁ connects the short bracket, both expansion base units will operate as described in (2) above and each other. Perform the opposite action.

In this way, the additional base units S ₁ and S ₂ that do not have the main function
are lines T, R, C, and E, which are common lines with the main unit Mo.
Since the extension base unit is wired with Sounds can be emitted simultaneously from the receiver.

As is clear from the above embodiments, according to the present invention, the ring tone from the base unit is added to the receiver of the additional base unit via the short bracket, and the ring tone blocking circuit is bypass-connected to the short bracket. When the short bracket is removed, the ring tone blocking circuit is controlled to conduct only by the call from the base unit, so the ring tone from the entrance slave unit can be removed individually or simultaneously on the additional slave unit side. This satisfies the user's desire to be able to prevent the problem by just doing the following.

In addition, on the extended base unit side, the ring tone from the entrance slave unit can be blocked by simply removing the short bracket, and the short bracket can be connected to the additional base unit in advance, so the user can It is convenient because there is no need to arrange metal fittings.

Furthermore, in the calling circuit of this intercom, the ringing tone sending amplifier only needs to be provided in the base unit, and the additional base unit has a simple circuit configuration, which has the effect of lowering the cost when viewed as an intercom system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an intercom in which a main unit is connected to an entrance slave unit and an additional main unit, and Fig. 2 is a circuit diagram in which the present invention is applied to the intercom shown in Fig. 1. Mo...Main unit, D...Slave unit, S ₁ , S ₂ ...Extended base unit, SW ₁ ...Call switch for base unit, SW ₂ ...Call switch for slave unit, SW ₄ ...Extended base unit Call switch, R ₁ ...Receiver of the main unit, R ₂ ...Receiver of the additional main unit, t ₁ , t ₂ ...Terminal to which the short fitting was connected, 10...Slave unit call detection section, 11... ...Base unit call detection unit, 12...Ring tone generation circuit, 13...
...Amplifier, 14...Shot metal fitting, 15...Ring tone blocking circuit.

Claims (1)

[Scope of utility model registration request] The base unit Mo includes a slave unit call detection unit 10 controlled by the call switch SW ₃ of the slave unit D, a call switch SW 1 from the base unit to the additional base units S ₁ and S 2, and a call switch SW _{1 from the base unit to the additional base units S 1} and S ₂ . A base unit call detection section 11 controlled by a ring switch SW ₄ , a ring tone generation circuit 12 activated by either one of the detection sections, and an output of the ring tone generation circuit. An amplifier 13 for amplification is provided, and the output side of the amplifier is connected to the receiver R ₁ of the base unit and the receiver R ₂ of the expanded base unit, respectively, and between the output side of the amplifier and the receiver of the expanded base unit. , a ring tone that connects the removable short metal fitting 14 and the terminals t ₁ and t ₂ to which the short metal fitting was connected under control of the base unit call detection unit when the short metal fitting is removed; An intercom characterized in that a blocking circuit 15 is interposed.