JPH031865B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of the Invention) The present invention relates to an intercom device particularly suitable for use in housing complexes such as condominiums, dormitories, and apartments. (Background of the Invention) In housing complexes such as condominiums, each dwelling unit (or room) is provided with one or two external communication lines (intercom lines) for communication between the common entrance or the manager. As an example of such an intercom system, FIG. 1 shows a connection diagram of an apartment building management device. In the figure, MC is a central control device as the main device located in the manager's room, and this central control device MC has a pair of external communication lines (voice lines) T and transmission (calling signal) each including a grounding wire. The home controller HC of each dwelling unit is connected to the external communication line T and transmission line L.
(HC1, HC2,..., HCn) are connected using a multi-drop method. This housing complex management device has a function as an intercom system, and the manager etc. calls the home controller HC of any dwelling unit from the central control device MC via the transmission line L and makes a call via the external call line T. In addition, the home controller HC of each dwelling unit can also call the central control unit MC and make a phone call. A similar intercom system will also be installed between each dwelling unit and the common entrance, if necessary. By the way, in such an apartment complex, a broadcasting line separate from the intercom line is provided for emergency broadcasting and service broadcasting, which has the disadvantage of increasing the number of wiring lines. In order to avoid such an increase in wiring, we have created an intercom device that uses existing intercom lines to make emergency broadcasts and service broadcasts to save wires, and that can be used for either one or two lines. A structure shown in FIG. 2 has been proposed. In the figure, T1 and T2 are external communication lines (or connection terminals), SW (SWa, SWb,...
SWg) is an electronic switch, BA is a buffer amplifier,
PA is power amplifier, M is microphone (telephone), YP
is the handset, FS is the switch, and SP is the speaker. The electronic switch SW is controlled as shown in Table 1 by a control circuit (not shown) that responds to control signals transmitted via a telephone line or transmission line (not shown) and the state of the switch FS. In the same table and Figure 2, a~
g is the output of the control circuit, and the electronic switch SW is turned on (closed) when these outputs are H, and turned off (opened) when these outputs are L. Note that when there is only one communication line, only outputs a, b, and c are effective.

[Table] In this way, the device shown in Figure 2 is connected to each electronic switch SW.
Depending on the combination of opening and closing of the
It is possible to realize various modes such as telephone calls using the line T2, and service broadcasting (audio reinforcement and handset reception) using the line T2. By the way, in this intercom device, even when two lines are used, line T1 is used for calls and emergency broadcasts, so there is an inconvenience that calls on the line T1 side are interrupted when emergency broadcasts are made. be. That is, since lines T1 and T2 are generally separated for calls to, for example, the manager and the common entrance, calls made using line T1 cannot be made via line T2 even if line T2 is free. , there is a disadvantage that the line cannot be used effectively. (Object of the Invention) The present invention provides an intercom circuit having one or two external communication lines, in which when there are two external communication lines, the first line is used for communication, and the second line is used for emergency broadcasts and service broadcasts. In the case of one line, the line is used for calls and emergency broadcasts, and emergency broadcasts can be amplified, service broadcasts can be received by amplification and handset, and in the control circuit that switches between these call modes, even if there is only one external line, 2
Based on the concept of making common operations possible even when using external communication lines, we aim to make effective use of external communication lines and reduce the total number of lines, and share control circuits and control flows whether there is one or two external communication lines. The object of the present invention is to provide an intercom device with standardized circuits. (Description of Examples) Hereinafter, description will be made using the drawings. Note that parts common or corresponding to those of the apparatus shown in FIG. 2 are denoted by the same reference numerals. FIG. 3 shows the configuration of an intercom device according to an embodiment of the present invention. As shown in Table 2, in the equipment shown in Figure 2, whether there is one external communication line or two external communication lines, the communication line T1 is used for both communication and emergency broadcasting (ANS). , the third
In the device shown in the figure, if there is one external call line, this line T1 is used for both calls and emergency broadcasts, but if there are two lines, call line T1 is used exclusively for calls and call line T2 is used for emergency broadcasts and emergency broadcasts. It is used for broadcasting.

[Table] Table 3 a b c f External call (T1) H L H L ANS L H L L Service (address) L H L L Service (hand) L L L H Table 3 shows the intercom equipment shown in Figure 3. The control output of the control circuit (not shown) is shown. The control circuit for controlling the operation of this intercom device, such as controlling each electronic switch SW in accordance with each mode shown in Table 3, can be configured using a microprocessor in a known manner. FIG. 4 shows the connection when the intercom device of FIG. 3 is used with one external communication line, and Table 4 shows the control circuit output in this case. Table 4 a b c f External call (T1) H L H - ANS L H L - In this case, connect terminal t of electronic switch SWb, which was connected to line T2 in Figure 3, to line T1. , the electronic switch SWf has been removed. Such circuit changes may be made, for example, by connecting the terminal t of the electronic switch SWb and the connection terminal T1 or T2 with a jamb wire, jamb pin, or mechanical It is sufficient to use a switch to change over, and to leave the electronic switch SWf as it is. (Effects of the Invention) As described above, according to the present invention, since the intercom line for telephone calls is also used for emergency broadcasting, line saving can be achieved, and when there are two intercom lines, one line can be used for emergency broadcasting. Since one line is dedicated to calls, and the other line is used for emergency broadcasts and service broadcasts, calls can be made even during emergency broadcasts, and the line can be used effectively. Furthermore, since a common control circuit and control flow are used in the case of one intercom line and the case of two intercom lines, it is possible to contribute to circuit standardization.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram of an apartment management device to which the intercom device of the present invention is applied, and Fig. 2 is a connection diagram of a conventional one.
FIG. 3 is a block diagram of an intercom device according to an embodiment of the present invention, and FIG. 4 is a block diagram of an intercom device in which the present invention is applied to a single line. It is a block diagram. HC...Home controller (intercom device), T, T1, T2...Telephone line, SWa to SWg
...electronic switch, SP...loudspeaker, M...transmitter, YP...telephone receiver.

Claims (1)

[Scope of Claims] 1. First and second connection terminals to which two external communication lines are connected, a transmitter circuit and a receiver circuit for handset communication, a loudspeaker circuit, the first connection terminal and the above-mentioned connection terminal. a first switch connected between the output end of the transmission circuit; and a second switch, one end of which is connected to the input end of the loudspeaker circuit, and the other end of which is switchable and connectable to the first or second connection terminal. a third switch inserted between the output end of the transmitter circuit and the input end of the receiver circuit, and a third switch connected between the input end of the receiver circuit and the second connection terminal. If there is one external line, this line is connected to the first connection terminal, and during a call, the transmitting circuit and the receiving circuit are connected to the line, and in an emergency, the external line is connected to the first connection terminal. When the above line is connected to the above public address circuit, and there are two external lines, the above transmitting circuit and the receiving circuit are connected to the first line during a call, and in case of an emergency, the second line is connected to the above public address circuit. and when the loudspeaker output during service broadcasting is selected, the second line and the loudspeaker circuit are connected, and when the handset reception is selected, the second line and the reception circuit are connected. Features intercom device.