JP2004147215A - Intercom for extension and intercom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intercom for extension which makes it possible to install an additional master apparatus simply and inexpensively without replacing the existing equipment such as a room master apparatus. <P>SOLUTION: Paging and a response call is made possible by radio communication between an entrance slave apparatus 1 and an expanded master apparatus 4 via a radio unit 3 by connecting the radio unit 3 with a transmission line 5 which connects the entrance slave apparatus 1 with the room master apparatus 2. The radio unit 3 has a call detection circuit 11, a speech receiving circuit 13 and a speech transmission circuit 15 to be individually connected with the transmission line 5 and composite input impedance of them is adjusted to be ten times the impedance of the transmission line 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus having a plurality of room master units for one entrance slave unit, and more particularly, to an additional intercom unit newly installed when a room master unit is added, and assembling the extension intercom unit. And an intercom device having an additional parent device.
[0002]
[Prior art]
2. Description of the Related Art An intercom apparatus as shown in the configuration diagram of FIG. 3 in which an entrance cordless handset installed at an entrance and the like and a living room parent machine installed in a house are connected by wire is widely used. In FIG. 3, reference numeral 31 denotes an entrance slave unit, reference numeral 32 denotes a main unit in a living room, and reference numeral 33 denotes a transmission line for connecting the two and transmitting signals and the like. If the parent device is required in a room other than the room where the parent device 32 is installed due to a change in the living environment or the like, the conventionally-installed living room parent device 32 is connected to a wired or wireless extension parent device. To a dedicated room base unit equipped with an interface for connecting, and connect the expanded base unit and the replaced room base unit by wire or wirelessly, and call and respond to the entrance slave unit 31 even in the desired room. It was possible (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-11-168568
[Problems to be solved by the invention]
However, in the case of the above-mentioned conventional extension mode, a dedicated room master device having an interface to which the extension master device can be connected is expensive, and the existing room master device is not required. It was not preferable. Further, in the case where the expansion master unit is connected by wire, a new connection line must be laid, which makes the expansion work troublesome and has a problem in terms of the aesthetics of the room.
In view of the above problems, the present invention provides an extension intercom device and an extension intercom device capable of easily and inexpensively installing an extension master device without replacing existing devices such as a room master device. It is intended to provide an intercom device provided with the same.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an extension intercom apparatus according to the first aspect of the present invention is configured such that at least one main room unit installed in a room and one entrance unit installed in a door are connected by a wire through a transmission line. And a wireless unit connected to a transmission line, and at least one additional master unit capable of wirelessly communicating with the wireless unit, wherein the wireless unit is a gateway. It is characterized in that a call signal from the slave unit is wirelessly transmitted to the extension master unit, and a call signal is transmitted / received to / from the extension master unit, thereby enabling a call and a response call from the entrance slave unit.
With this configuration, the extension base unit can be installed simply by interposing a wireless unit on the transmission line of the intercom apparatus including the wired entrance unit and the living room base unit, so that the existing wired connection entrance unit and the living room base unit can be installed. The parent device can be added without changing the equipment of the intercom device including the device. Therefore, the amount of waste at the time of expansion is reduced, and the expansion master unit can be installed at low cost.
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, the wireless unit includes a call detection circuit for detecting a call signal from the entrance handset, and a transmission circuit for outputting a call signal from the extension base unit to the entrance handset. And a receiving circuit for inputting a call signal from the entrance cordless handset, each of which is connected to a transmission line, and an impedance obtained by combining an input impedance of the call detecting circuit, an output impedance of the transmitting circuit, and an input impedance of the receiving circuit. It is characterized by being higher than the impedance of the transmission line.
With this configuration, the input impedance of the wireless unit is higher than the impedance of the transmission line to be connected. Therefore, even if the wireless unit is interposed in the transmission line, a large burden is imposed on the entrance slave unit and the parent unit in the room, and malfunction does not occur. .
[0007]
The intercom apparatus for extension according to the invention of claim 3 is an intercom apparatus in which at least one parent device installed in the room and one entrance device installed in the entrance are connected by wire through a transmission line. An extension intercom device to be connected and used, comprising: a wireless unit connected to a transmission line; and at least one additional master unit capable of wirelessly communicating with the wireless unit, wherein the wireless unit transmits a call signal from an entrance slave unit. And a video signal is wirelessly transmitted to the extension base unit, and a call signal is transmitted / received to / from the extension base unit, so that a call and a response call from the entrance slave unit are enabled.
With this configuration, it is possible to install an additional base unit that can receive a video signal in addition to a call with the front-end unit simply by interposing a wireless unit on the transmission line of the intercom apparatus including the wired base unit and the living room base unit. Therefore, the base unit can be added without changing the devices of the existing intercom apparatus including the wired entrance unit and the room base unit. Therefore, the amount of waste at the time of expansion is reduced, and the expansion master unit can be installed at low cost.
[0008]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the wireless unit includes a call detecting circuit for detecting a call signal from the entrance cordless handset, and a transmission circuit for outputting a call signal from the extension base unit to the entrance cordless handset. And a receiving circuit for inputting a call signal and a video signal from the entrance cordless handset. Each of the receiving circuits is connected to a transmission line. The combined impedance is higher than the transmission line impedance.
With this configuration, the input impedance of the wireless unit is higher than the impedance of the transmission line to be connected. Therefore, even if the wireless unit is interposed in the transmission line, a large burden is imposed on the entrance slave unit and the parent unit in the room, and malfunction does not occur. .
[0009]
According to a fifth aspect of the present invention, in the second or fourth aspect, the combined impedance is at least five times the impedance of the transmission line.
With this configuration, since the impedance of the wireless unit is sufficiently large, no load is applied to the existing intercom apparatus.
[0010]
The intercom apparatus according to a sixth aspect of the present invention is the intercom apparatus according to any one of the first to fifth aspects, wherein at least one living room parent device, one entrance child device wiredly connected to the living room parent device by a transmission line. And an additional intercom device.
According to this configuration, since the wireless main unit is provided, the mobile unit can be easily installed and moved between rooms, and the convenience is improved. In addition, a conventional wired intercom device can be used as it is for a wired child-entry unit or a room parent device, and a system configuration including a wireless extension parent device at low cost can be achieved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing a first embodiment of an intercom apparatus according to the present invention, wherein 1 is an entrance slave, 2 is a living room master, 3 is a wireless unit, and 4 is an extension master. The entrance child device 1 and the living room parent device 2 are connected via a transmission line 5 via a wireless unit 3. The wireless unit 3 is a device for performing wireless communication with the extension base unit 4, and the wireless unit 3 and the extension base unit 4 constitute an extension intercom device.
Reference numeral 6 denotes a camera for imaging the visitor, 7 denotes a monitor 7 for displaying an image captured by the camera 6, and the parent device 2 receives a call from the entrance child device 1 and displays an image of the visitor on the monitor 7. This is an intercom apparatus of a conventional type as shown in FIG.
[0012]
Hereinafter, the wireless unit 3 and the extension base unit 4, which are main parts of the present invention, will be described in detail with reference to FIG. FIG. 2 is an explanatory diagram of an intercom apparatus in which the wireless unit 3 and the extension base unit 4 are shown by circuit blocks. The wireless unit 3 includes a call detection circuit 11 for detecting a call signal from the entrance slave unit 1 and each circuit. The control unit CPU 12, the receiving circuit 13 for inputting a call signal from the entrance device 1, the unit transmission circuit 14 for converting the call signal into a transmission signal, and the output of the call signal from the extension base unit 4 to the entrance device 1. And a unit-side receiving circuit 16 for converting a received signal into an audio signal, 17 is a unit-side mixer, and 18 is a unit-side transmitting / receiving antenna.
[0013]
The call detection circuit 11, the reception circuit 13, and the transmission circuit 15 are respectively arranged in parallel and connected to the transmission line 5, and a combined input of the call detection circuit 11, the reception circuit 13, and the transmission circuit 15 is provided. The impedance is set higher than the impedance of the transmission line 5 between the entrance slave unit 1 and the living room master unit 2. For example, if the impedance of the transmission line 5 is 75Ω, the combined input impedance of the wireless unit 3 is set to 750Ω, which is ten times.
[0014]
Further, the extension base unit 4 includes a ringing tone generation circuit 21, a base unit side CPU 22 for controlling each circuit, a base unit side reception circuit 23 for converting a received signal into a voice signal, and a transmitter / receiver for amplifying the converted voice signal. 24, a receiver amplifier 25 for outputting to a receiver 24a, a microphone amplifier 26 for amplifying an audio signal from the handset 24, and a base unit side transmission circuit 27 for converting an output signal of the microphone amplifier 26 into a transmission signal. The machine side mixer, 29 is a main unit side transmitting / receiving antenna, and 30 is a speaker.
[0015]
Next, the operation of the intercom apparatus will be described with reference to FIG. First, when the visitor presses the call button 1a of the entrance child device 1, a ringing tone sounds in the living room parent device 2 and an image captured by the camera 6 is displayed on the monitor 7. At the same time, the call detection circuit 11 of the wireless unit 3 detects the call, and transmits a call signal from the unit-side transmission circuit 14 under the control of the unit-side CPU 12. Then, the base unit side receiving circuit 23 of the additional base unit 4 receives this via the base unit side transmitting / receiving antenna 29, operates the ringing tone generation circuit 21 under the control of the base unit side CPU 22, and generates a ringing sound from the speaker 30. Let it ring.
When the resident picks up the handset 24 of the extension base unit 4 in response to the ringing sound, the call start data from the base unit transmission circuit 27 is transmitted to the base unit transmission / reception antenna 29 under the control of the base unit CPU 22. The communication is transmitted to the wireless unit 3 via the wireless communication unit 3 and the communication with the entrance slave unit 1 is established. At the same time, the wireless unit 3 receives the call start data and enters the call state under the control of the unit side CPU 12. Thus, the extension master unit 4 can communicate with the entrance slave unit 1 via the wireless unit 3.
[0016]
In this manner, the extension base unit 4 can be installed only by interposing the wireless unit 3 on the transmission line 5 of the intercom apparatus including the wired entrance unit 1 and the living room base unit 2, so that the existing wired entrance is connected. The parent device can be added without changing the equipment of the intercom apparatus including the child device and the room parent device. Therefore, the amount of waste at the time of expansion is reduced, and the expansion master unit can be installed at low cost.
Furthermore, since the input impedance of the wireless unit is sufficiently higher than the impedance of the transmission line to be connected, even if a base unit is added to the entrance unit or living room base unit by connecting the wireless unit, the existing equipment will be loaded and malfunction. There is nothing.
In addition, by installing the extension intercom device, a system having a wireless extension master unit can be easily installed and moved between living rooms, thereby improving convenience. In addition, a conventional wired intercom device can be used as it is for a wired child-entry unit or a room parent device, and a system configuration including a wireless extension parent device at low cost can be achieved.
[0017]
3 and 4 show a second embodiment of an intercom apparatus according to the present invention, FIG. 3 is an external view, and FIG. 4 is a circuit block diagram of a wireless unit and an extension master unit. The second embodiment is different from the first embodiment in the configuration of the wireless unit 3a and the extension base unit 4a, and a monitor 8 is also provided in the extension base unit 4a. The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.
The wireless unit 3a includes a receiving circuit 13a that receives a video signal in addition to a call signal, instead of the reception circuit 13 of the wireless unit 3 of FIG. 2, and the unit-side transmission antenna 18 transmits a video signal together with the call signal. . The extension base unit 4a has a video signal amplification circuit 34 for causing the monitor 8 to output a video signal received from the wireless unit 3a. The video signal received together with the call signal by the base unit side transmitting / receiving antenna 29 is transmitted to the base unit 4a. The signal is demodulated by the side receiving circuit 23a and output to the monitor 8 via the video signal amplifying circuit 34.
As described above, it is possible to transmit a video signal to the extension base unit without largely changing the configuration of the wireless unit from the configuration of FIG. Can be easily implemented.
[0018]
In the above-described embodiment, the input impedance of the wireless unit is set to be sufficiently high as 10 times the impedance of the transmission line to be connected. Can operate normally. However, it is preferable that the impedance is five times or more.
In addition, the number of expansion base units is not limited to one, and it is possible to provide a plurality of expansion base units with the same characteristics for one wireless unit, and an intercom apparatus having a plurality of living room base units from the beginning. However, if the configuration is such that the wireless terminal is installed on the transmission line of the entrance, it is possible to install the additional intercom device as long as the configuration is connected to the entrance slave unit by a transmission line.
In the above-described embodiment, a so-called TV door phone in which a camera is provided in an entrance slave unit has been described as an example. However, the above-mentioned extension intercom device can be applied to an intercom device without a camera, and a parent device can be easily added.
[0019]
【The invention's effect】
As described in detail above, according to the present invention, the extension base unit is installed with the wireless unit interposed in the transmission line of the intercom apparatus including the wired entrance unit and the room base unit. The master device can be easily added without replacing the existing device. Therefore, the amount of waste at the time of expansion is reduced, and the expansion master unit can be installed at low cost.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of an intercom apparatus according to the present invention.
FIG. 2 is a configuration diagram showing a circuit block diagram of the extension intercom apparatus of FIG. 1;
FIG. 3 is a configuration diagram showing a second embodiment of the intercom apparatus according to the present invention.
FIG. 4 is a configuration diagram showing a circuit block diagram of the extension intercom device of FIG. 3;
FIG. 5 is a configuration diagram of an intercom apparatus before expansion.
[Explanation of symbols]
1. Entrance cordless handset, 2. Room parent unit, 3, 3a wireless unit, 4, 4a additional unit, 5, transmission line, 11, call detection circuit, 13, reception circuit, 13a: receiving circuit, 15: transmitting circuit.

Claims (6)

An extension intercom device used by connecting at least one main unit installed in a room and one entrance slave unit installed in a door to an interphone device that is connected by wire through a transmission line,
A wireless unit connected to the transmission line; and at least one additional base unit capable of wireless communication with the wireless unit, wherein the wireless unit wirelessly transmits a call signal from the entrance slave unit to the additional base unit. And an extension intercom device for transmitting and receiving a call signal to and from the extension base unit so as to enable calling and answering calls from the entrance slave unit. The wireless unit includes a call detection circuit that detects a call signal from the entrance slave, a transmission circuit that outputs a call signal from the extension base unit to the entrance slave, and a call signal from the entrance slave. Receiving circuits, each connected to the transmission line,
2. The extension intercom apparatus according to claim 1, wherein an impedance obtained by combining an input impedance of the call detection circuit, an output impedance of the transmission circuit, and an input impedance of the reception circuit is higher than an impedance of the transmission line. An extension intercom device used by connecting at least one main unit installed in a room and one entrance slave unit installed in a door to an interphone device that is connected by wire through a transmission line,
A wireless unit connected to the transmission line, and at least one additional master unit capable of wireless communication with the wireless unit, wherein the wireless unit sends a call signal and a video signal from the entrance slave unit to the additional master unit. An extension intercom device, which transmits wirelessly and transmits and receives a call signal to and from the extension base unit, thereby enabling calling and answering calls from the entrance slave unit. The wireless unit includes a call detection circuit that detects a call signal from the entrance slave unit, a transmission circuit that outputs a call signal from the extension base unit to the entrance slave unit, a call signal and an image from the entrance slave unit. A receiving circuit for inputting a signal, each being connected to the transmission line,
4. The extension intercom apparatus according to claim 3, wherein an impedance obtained by combining an input impedance of the call detection circuit, an output impedance of the transmission circuit, and an input impedance of the reception circuit is higher than an impedance of the transmission line. 5. The extension intercom apparatus according to claim 2, wherein the combined impedance is at least five times the impedance of the transmission line. 6. An intercom device according to claim 1, further comprising at least one parent device in the living room, one entrance device connected to the parent device in the wiring by a transmission line, and the additional intercom device according to claim 1. An intercom device characterized by the above-mentioned.

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