JP2010081122A - Intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intercom system having an intercom master unit that is provided in each household of a two-family house and has miniaturized size and reduced costs. <P>SOLUTION: The intercom master unit 1 of each household of the intercom system includes: a slave unit connection terminal T1 to which slave units (intercom and camera slave units 3, 4) are connected; and a plurality of sub master unit connection terminals T2(T2a, T2b) to which sub master units 2a...2n are connected. One of the sub master unit connection terminals T2 is used as a two-family terminal T2b to which the intercom master unit 1 of another household is connected. Also, in addition to the two-family teminals T2b, the intercom system includes switches SW1, SW2 (connection change means) for selecting one of a camera-side input point 18 provided between the slave unit connection terminal T1 and a video modulation/demodulation circuit 13 (video demodulation means) and an extension-side output point 19 provided between the sub master connection terminal T2b and the video modulation/demodulation circuit 13 for connection. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intercom system used in a two-family house.

  In recent years, two-family houses in which a parent household and a child household coexist in one house have become widespread. In such a two-family house, an interphone system is provided for each household so that each household can individually respond to visitors. Was installed.

  In order to ensure privacy between two households, it is preferable to install a separate intercom system in each household so that interphone calls between households cannot be made. If there is a call, you may want to answer the other household instead, or make an intercom call between households. An intercom system for a two-family house that can be switched to a possible absence mode has been proposed (see, for example, Patent Document 1).

  In the interphone system disclosed in the above document, an interphone master unit is arranged in only one household, and the interphone master unit includes a door phone slave unit with a camera in each household and a plurality of interphone sub-phones installed in each household. Each is connected to the main unit. The interphone base unit and the interphone sub-base unit belong to the first group of one household, belong to the second group of the other household, or have one household and the other household combined. A switch for setting whether to belong to the group 3 is provided, and the call button is pushed by the doorphone slave of any household, and the call signal from the doorphone slave is sent to the sub-master via the master In this case, the master unit and the sub master unit refer to the setting of the changeover switch, and the ring tone is sounded only when the call signal from the own group's doorphone slave unit is input, and the response to the call is also sent to the own group's doorphone. It can be done only with the child. In addition, when the group is set to the third group by the change-over switch on either the master unit or the sub-master unit, the entire system is switched to the absence mode so that inter-household calls are possible. When the call button is pressed with a device, it is possible to respond with the parent device or the sub-parent device of the household at home.

  However, in the interphone system disclosed in the above document, only one household has an interphone master unit. Therefore, if a power failure occurs in one of the households or if the interphone master unit fails, the other household However, there was a problem that the intercom system could not be used.

  Therefore, as shown in the system configuration diagram of FIG. 5, between each of the households A <b> 1 and A <b> 2 of the two-family house, between the doorphone unit 3 with a camera installed outside the dwelling unit and the doorphone unit 3 installed inside the dwelling unit The interphone master unit 1 (hereinafter abbreviated as “master unit”) that receives and transmits audio signals through the signal line Ls1 and receives the video signal is input to the master unit through the signal line Ls1. An interphone sub-master device (hereinafter abbreviated as sub-master device) 2a, which is installed in the dwelling unit and connected to the master device 1 via a balanced two-wire transmission line Ls2. There has also been proposed a system in which an interphone system composed of 2b... 2n is provided, and a telephone call between households can be performed by connecting the master units 1 and 1 of each household A1 and A2 with a signal line Ls3. .

  As shown in FIG. 6, the base unit 1 includes a microphone 10a, a speaker 10b, and a two-wire / four-wire conversion circuit, and processes audio signals output from the microphone 10a to perform demultiplexing circuits 16a and 16c described later. , 21, and the audio signal input from the demultiplexing circuits 16 a, 16 c, 21 is signal-processed to generate sound from the speaker 10 b, and between the sub-master units 2 a to 2 n and the camera sub unit 4. Control / sound modulation / demodulation circuit 11 for transmitting a control signal by the FSK method, monitor 12 for video display, and video modulation / demodulation for demodulating a video signal sent from the doorphone slave unit 3 or the camera slave unit 4 and displaying it on the monitor 12 Operation unit 1 for performing various operations (response operation to call signal, operation for monitoring video of desired door phone sub unit 3, call operation of sub-master units 2a to 2n) with circuit 13 A call signal receiving circuit 15 for monitoring a line voltage of the transmission line Ls1 and receiving a call signal transmitted from the intercom unit 3; and a voice signal and a control signal input from the control / sound modulation / demodulation circuit 11 having a frequency A demultiplexing circuit 16a that multiplexes and outputs the signal to the signal line Ls1, and separates the audio signal from the multiplexed signal input via the signal line Ls1 and outputs the demultiplexed signal to the control / sound modulation / demodulation circuit 11, and the intercom unit 3 or A demultiplexing circuit 16b that separates a video signal from a multiplexed signal input from the camera unit 4 via the signal line Ls1 and outputs the separated video signal to the video modulation / demodulation circuit 13, an audio signal input from the control / audio modulation / demodulation circuit 11, and The control signal is frequency-multiplexed and output to the transmission line Ls2, and from the multiplexed signal input from the secondary master units 2a to 2n via the transmission line Ls2, the audio signal and A demultiplexing circuit 16c that separates the control signal and outputs it to the control / sound modulation / demodulation circuit 11, a demultiplexing circuit 16d that frequency-multiplexes the video signal separated by the demultiplexing circuit 16b again, and outputs it to the transmission line Ls2, and a microcomputer And a household communication circuit 20 for transmitting and receiving audio signals and video signals between households.

  The parent device 1 of the parent household A1 and the parent device 1 of the child household A2 are connected via a signal line Ls3, and the inter-household call circuit 20 includes the control / voice modulation / demodulation circuit 11 or the demultiplexing circuits 16a, 16c. Are multiplexed and output to the signal line Ls3, and the audio signal and the control signal are separated from the frequency multiplexed signal input via the signal line Ls3. Alternatively, the video signal from the doorphone sub unit 3 or the camera sub unit 4 of another household is separated from the demultiplexing circuit 21 output to the demultiplexing circuits 16a and 16c and the frequency multiplexed signal input via the signal line Ls3. A demultiplexing circuit 22 that multiplexes the video signals input from the doorphone sub unit 3 or the camera sub unit 4 of the same household and outputs them to the main unit 1 of another household via the signal line Ls3; A switch 23 provided between the demultiplexing circuit 22 and the video modulation / demodulation circuit 13, for turning on / off the input of the video signal from the demultiplexing circuit 22 to the video modulation / demodulation circuit 13, the video modulation / demodulation circuit 13, and the demultiplexing circuit 22; And a switch 24 for turning on / off the input of the video signal from the video modulation / demodulation circuit 13 side (that is, the doorphone slave unit 3 or the camera slave unit 4) to the demultiplexing circuit 22.

  Here, the call response by the conventional intercom system will be described below. First, a case will be described in which a call from the door phone slave unit 3 of the parent household A1 is answered by the parent device 1 or the sub-parent device 2a of the parent household A1. The power supply voltage (DC voltage) from the base unit 1 to the doorphone slave unit 3 is relatively low in order to reduce the power consumption of the system when the doorphone slave unit 3 is not in a talking state or a monitor state described later. (This state is referred to as a standby power supply state.) In a call state or a monitor state, the state is relatively high (this state is referred to as an operation power supply state). The camera slave unit 4 is supplied with operating power from a commercial power source.

  When the call button 3a is operated in the standby power supply state, the intercom unit 3 transmits a call signal to the base unit 1 by lowering the line voltage of the signal line Ls1 to a voltage lower than that in the standby power supply state. In the base unit 1, the call signal receiving circuit 15 detects the call signal by monitoring the line voltage of the signal line Ls1, and when the call signal is received and output to the control unit 17, the control unit 17 outputs the signal line. Control for changing the power supply voltage to Ls1 from the standby power supply state to the operation power supply state, causing the speaker 10b to ring the calling signal, and causing the secondary master units 2a to 2n to ring the calling signal via the demultiplexing circuit 16c By sending a signal, a ringing signal is sounded from the master unit 1 and the sub master units 2a to 2n.

  In the intercom unit 3, when the power supply state is switched to the operation power supply state, the built-in camera is activated and the video signal of the camera is transmitted to the main unit 1 via the signal line Ls 1 and the audio signal processing unit is activated. Thus, the voice signal is exchanged, that is, switched to a state in which a call is possible. At this time, in the master unit 1, the video modulation / demodulation circuit 13 demodulates the video signal separated by the demultiplexing circuit 16 b and displays it on the monitor 12, and the demultiplexing circuit 16 d remultiplexes the video signal and sub-master units 2 a to 2 n. Are output to the monitors 25 of the sub-master units 2a to 2n, and the images captured by the camera of the door phone slave unit 3 are displayed.

  When the householder who has heard the call signal operates the response buttons 14a and 26 of the master unit 1 or the sub master units 2a to 2n, the master unit 1 or the sub master units 2a to 2n in which the response buttons 14a and 26 are operated and the door phone. A communication path is formed with the sub unit 3, and a housekeeper in the house can make a call with a visitor while viewing the images on the monitors 12 and 25.

  In the interphone system shown in FIG. 5 and FIG. 6, when one of the households is away and cannot respond to the visitor, the call from the doorphone sub unit 3 of one household is used to call the master unit 1 of the other household. Alternatively, the secondary master units 2a to 2n can respond. That is, in the master unit 1 of each household A1 and A2, the switches 23 and 24 of the inter-household call circuit 20 are switched according to the setting operation of the operation unit 14 for performing absence setting, and the switch 23 is turned on at home. Then, the switch 24 is turned off, and the video signal sent from the other household is separated by the demultiplexing circuit 22 and input to the video modulation / demodulation circuit 13 to enable a call with the doorphone sub unit 3 of the other household. Further, in the master unit 1 of each household A1, A2, when the absence is set, the switch 23 is turned off and the switch 24 is turned on, and the video signal from the doorphone slave unit 3 or the camera slave unit 4 of the same household is multiplexed by the demultiplexing circuit 22. And output to the signal line Ls3 so that a telephone call can be made between the doorphone slave unit 3 of the same household and the parent unit 1 or the sub-parent units 2a to 2n of the other households.

Here, when the call button 3a is pushed by the doorphone sub unit 3 of the household A1 in which the absence setting is set in the base unit 1, the call signal receiving circuit 15 of the household A1 receives the call signal and the control unit 17 And the control unit 17 switches the power supply state to the door phone slave unit 3 to the operation power supply state to sound the ringing sound from the speaker 10b and to transmit the control signal for sounding the ringing sound to the demultiplexing circuits 16c and 21. And the master unit 1 and the sub master unit 2a of the two households A1 and A2 are output by being multiplexed to each other and output to the master unit 1 and the sub master units 2a to 2n of the other household A2. The ringing tone is sounded from ~ 2n. Further, when the power supply state is switched to the operation power supply state, the doorphone sub unit 3 of the household A1 activates the camera and outputs the video signal of the camera to the base unit 1. The base unit 1 of the household A1 has its own unit. The video is displayed on the monitor 12, the video is displayed on the monitors of the secondary master units 2a to 2n, and the video signal is output from the inter-household call circuit 20 to the master unit 1 and the secondary master units 2a to 2n of the other household A2. Thus, the video is displayed on the master unit 1 and the sub-master units 2a to 2n of the other household A2. Then, when a householder of another household A2 hears a ringing tone and presses the response buttons 14a and 26 of the master unit 1 or the sub-master units 2a to 2n, the parent of the other household A2 whose response button 14a or 26 has been pressed is operated. A communication path is formed between the machine 1 or the sub-master 2a to 2n and the doorphone slave 3 of the household A1 via the intercom master 1 of the household A1, and the doorphone slave 3 of the absence household and the homephone of the home household A telephone call can be made between the master unit 1 or the sub-master units 2a to 2n.
Japanese Patent No. 3617271

  In the above-described conventional intercom system, individual intercom systems are installed in each of the households A1 and A2 of a two-family house, and the inter-household communication circuit 20 is provided in the master unit 1 of each of the households A1 and A2. For example, even if an abnormality occurs in the intercom system of one household, the intercom system of the other household is not affected, and like the intercom system disclosed in Patent Document 1, Since it is not necessary to perform group setting for each sub-master unit, there is an advantage that the setting work can be reduced, but transmission of video signals from the master unit 1 to the sub-master units 2a to 2n in the same household is one-way. In contrast to communication, transmission of video signals between households is bidirectional communication, and therefore includes demultiplexing circuits 21 and 22 and their switching circuits (including switches 23 and 24). It requires special households between speech circuit 20 which includes a, with increasing the cost of the main unit 1, there is a problem that hinders miniaturization of the base unit 1 increases the circuit scale.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an interphone system in which the interphone master unit provided in each household of a two-family house is reduced in size and cost. There is.

  In order to achieve the above object, according to the invention of claim 1, an interphone system is provided in a two-family house for making an extension call within a household and between households. Interphone parent installed in a house with a handset including a door phone with a camera and a calling means for making a call between the handset and a video display means for displaying a video taken by the handset Display means for displaying a picture taken by the slave unit via the interphone master unit and a call unit for making a call between the slave unit and the interphone master unit via the interphone master unit Interphone sub-master devices that are installed in the house, and each household inter-phone master device is connected to a slave device connection terminal to which a slave device is connected, and a plurality of inter-phone sub-master devices are connected to each other. Vice And a video demodulating means for demodulating the video signal input from the slave terminal and displaying it on the video display means, and one of the sub-master connection terminals is an interphone parent of another household. Used as a two-household terminal to which the machine is connected, the camera side input point provided between the slave unit connection terminal and the video demodulation means, or the extension side provided between the sub-master connection terminal and the video demodulation means Connection switching means for selecting any of the output points and connecting the two household terminals is provided.

  In the invention of claim 2, in the invention of claim 1, the interphone master unit is in a two-household mode that enables transmission and reception of signals to and from the interphone master unit of another household, or between the interphone master units of other households. Communication mode switching means for switching to any one of the independent household modes for blocking signal transmission and reception, and in the independent household mode, the communication mode switching means is configured to connect the two household terminals to the extension side output point. It is characterized by switching.

  In the invention of claim 3, in the invention of claim 1 or 2, the interphone master unit is in a two-household mode in which signals can be exchanged with an interphone master unit of another household, or an interphone of another household Communication mode switching means for switching to any one of the independent household modes for blocking transmission and reception of signals with the master unit, and an amplifier for amplifying the video signal input from the slave unit connection terminal and the secondary master unit connection terminal, In the two-household mode, the communication mode switching means of the interphone master unit that transmits the video signal of the slave unit of the own household to the interphone master unit of another household is a connection switching means so that the two-household terminal is connected to the extension side output point It is characterized by switching.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the interphone master unit is capable of transmitting / receiving signals to / from the interphone master unit of another household, or another household. Communication mode switching means for switching to any one of the independent household modes for blocking transmission / reception of signals to / from the interphone master unit, and an amplifier for amplifying the video signal input from the slave unit connection terminal and the sub master unit connection terminal In the two-household mode, the communication mode switching means of the interphone master unit that receives and displays the video signal transmitted from the interphone master unit of another household is connected so that the two-household terminal is connected to the camera side input point The switching means is switched.

  According to the first aspect of the present invention, when one of the sub-master terminals is used as a two-household terminal and a call from the slave unit of the own household is answered by the master or sub-master of another household, By switching the terminal to the output side on the extension side, the video from the slave unit of the household can be displayed to other households. In addition, when answering a call from a slave unit of another household, the video signal of the other household is displayed as a video by switching the two household terminal to the camera side input point and inputting it to the video demodulation circuit from the camera side input point. It can be displayed by means. Therefore, it is not necessary to provide a separate circuit for communication between households like the conventional interphone master unit for a two-family house, and the circuit scale of the interphone master unit can be reduced and the size can be reduced. There is an effect that it is possible to go down.

  According to the invention of claim 2, since the signal transmission to the interphone master of another household is blocked while the interphone master is operating in the independent household mode, the privacy between households can be maintained.

  According to the invention of claim 3, when the interphone master unit is operating in the two-household mode, the video signal from the slave unit of the own household is amplified by the amplifier provided in the master unit of the own household, and is passed through the two-household terminal. Can be output to the master unit of another household, so that the wiring length of the transmission path between households can be increased.

  According to the invention of claim 4, when the interphone master is operating in the two-household mode, the video signal from the interphone master of another household input via the two-household terminal can be provided to the master of the own household. Since it can be amplified by the amplifier and displayed on the secondary master unit, the wiring length of the transmission path between the master unit and the secondary master unit can be increased.

  Embodiments of the present invention will be described below with reference to FIGS. The intercom system according to the present embodiment is used for a two-family house, and allows extension calls in the two households A1 and A2 of the two-family house and calls between the households A1 and A2. In this embodiment, household A1 is described as a parent household, and household A2 is described as a child household.

  As shown in FIG. 2, each household A1 and A2 has a doorphone unit with a camera 3 installed outside a dwelling unit such as a front door, and a predetermined area including a detection area when an environmental change is detected in a predetermined detection area. The camera sub unit 4 that captures the shooting area, the microphone 10a, the speaker 10b, and the monitor 12 (video display means) have a telephone conversation with the door phone sub unit 3 using the microphone 10a and the speaker 10b. An interphone master unit (hereinafter abbreviated as “master unit”) 1 that displays images captured by the unit (door phone sub unit 3 and camera sub unit 4) on the monitor 12, a speaker, a microphone, and a monitor (video display means). And connected to the base unit 1 via the signal line Ls2, and makes a call using the speaker and the microphone with the door phone sub unit 3 through the base unit 1, and also the video captured by the sub unit. Intercom is displayed on Nita sub master unit (hereinafter, to abbreviated as auxiliary base unit.) 2a, 2b ... and 2n, respectively.

  As shown in FIG. 1, the master unit 1 of each household A1 and A2 includes a plurality of slave unit connection terminals T1 to which slave units (doorphone slave unit 3 and camera slave unit 4) are connected via a signal line Ls1. Sub-master devices 2a to 2n are provided with sub-master device connection terminals T2 (T2a, T2b) to which the sub-master device connection terminals T2 are connected via the signal line Ls2, and one of the sub-master device connection terminals T2 The parent device 1 of another household is connected to T2b via the signal line Ls3. That is, the sub-master connection terminal T2b is used as a two-household terminal (hereinafter abbreviated as a two-household terminal T2b).

  The base unit 1 includes a microphone 10a, a speaker 10b, and a 2-wire to 4-wire conversion circuit, and performs signal processing on an audio signal output from the microphone 10a and outputs it to demultiplexing circuits 16a and 16c described later. The audio signals input from the circuits 16a and 16c are signal-processed to generate sound from the speaker 10b, and further, control signals are transmitted by the FSK method between the sub-master units 2a to 2n, the camera slave unit 4, and the master unit 1 of another household. And a control / sound modulation / demodulation circuit 11 for transmitting the sound, and the microphone 10a, the speaker 10b, and the control / sound modulation / demodulation circuit 11 constitute a communication means.

  The master unit 1 also demodulates video signals input from a monitor 12 (video display means) made up of, for example, a liquid crystal display and demultiplexing circuits 16b and 16e described later and displays them on the monitor 12 (video demodulation). Means), an operation unit 14 for performing various operations (operation for responding to a call signal, operation for displaying an image of a desired doorphone slave unit 3, operation for calling the secondary master units 2a to 2n), and a signal A call signal receiving circuit 15 that receives a call signal from the doorphone slave unit 3 or the camera slave unit 4 by monitoring the line voltage of the line Ls1, and a control unit 17 that performs overall operation control using the microcomputer as a main component. And.

  Here, although the master unit 1 has three sets of slave unit connection terminals T1, it has only one video modulation / demodulation circuit 13 for receiving and processing video signals, so that collision between video signals is avoided. Therefore, the time-division multiplex transmission method is adopted, and the doorphone sub-unit 3 and the camera sub-unit 4 are individually assigned to a plurality of time slots defined by the control signal transmitted from the control unit 17. Each of the camera slave units 4 transmits a video signal in the time slot assigned to itself, receives it in each time slot in the video modulation / demodulation circuit 13 of the base unit 1, and re-creates the original video from the demodulated video signal. It is configured and displayed on the monitor 12. The details of time division multiplex transmission are well known in the art and will not be described here.

  The base unit 1 also includes a plurality of demultiplexing circuits 16 (16a... 16e). The demultiplexing circuit 16a frequency-multiplexes the audio signal and control signal input from the control / audio modulation / demodulation circuit 11 to the signal line Ls1. In addition to outputting, the audio signal is separated from the multiplexed signal input via the signal line Ls 1 and output to the control / audio modulation / demodulation circuit 11. The demultiplexing circuit 16b separates the video signal from the multiplexed signal input via the signal line Ls1, and outputs the video signal to the video modulation / demodulation circuit 13. The demultiplexing circuit 16c frequency-multiplexes the audio signal and the control signal input from the control / audio modulation / demodulation circuit 11 and outputs them to the signal lines Ls2 and Ls3, and also from the sub-master units 2a to 2n via the signal line Ls2. The audio signal and the control signal are separated from the input multiplexed signal and the multiplexed signal input from the master unit 1 of another household via the signal line Ls3 and output to the control / audio modulation / demodulation circuit 11. The demultiplexing circuit 16d frequency-multiplexes the video signal separated by the demultiplexing circuit 16b again, and outputs it to the signal lines Ls2 and Ls3. The demultiplexing circuit 16e separates the video signal from the multiplexed signal input via the signal line Ls3 and outputs it to the video modulation / demodulation circuit 13. Between the demultiplexing circuit 16b and the demultiplexing circuit 16e, an amplifier 20a that amplifies the video signal input from the demultiplexing circuit 16b and outputs the amplified video signal to the video modulation / demodulation circuit 13 and the demultiplexing circuit 16e, and the amplifier 20a. Is connected to an amplifier 20b that further amplifies the video signal and outputs it to the demultiplexing circuit e.

  The base unit 1 includes a switch SW1 between the extension side output point 18 provided between the demultiplexing circuit 16d and the sub-base unit connection terminal T2a and the two-household terminal T2b, and the slave unit connection terminal T1. A switch SW2 is provided between the camera side input point 19 provided between the video modulation / demodulation circuit 13 and the demultiplexing circuit 16e. Here, the control unit 17 is in the two-household mode that enables transmission / reception of signals to / from the parent device 1 of another household according to the operation of the operation unit 14 or between the parent device 1 of another household. The switch SW1 and SW2 are switched on / off according to the set operation mode. That is, the switches SW1 and SW2 constitute connection switching means, and the control unit 17 and the operation unit 14 constitute communication mode switching means.

  Here, each of the switches SW1 and SW2 is set with an on state as an initial value. When the two-household mode is selected by the operation unit 14, the control unit 17 switches the operation mode to the two-household mode according to the selection operation from the operation unit 14 and transmits a control signal to the parent device 1 of another household. Then, the operation mode of the parent device 1 of another household is switched to the two-household mode. In the master unit 1 of another household, the control unit 17 switches the operation mode to the two-household mode according to the received control signal, turns off the switch SW1, and turns on the switch SW2. On the other hand, when the independent household mode is selected by the operation unit 14, the control unit 17 switches the operation mode to the independent household mode according to the selection operation from the operation unit 14, calling the doorphone from the doorphone sub unit 3 and the camera sub unit. When there is no detection input of environmental change by 4, the switch SW 1 is turned on so that control signals can be exchanged with the master unit 1 of another household, and the door phone call from the door phone slave unit 3 or the camera slave unit 4 When there is an environmental change detection input, the switch SW1 is turned off (the switch SW2 remains off), and reception of the video signal from the parent device 1 of another household is blocked.

  The intercom system of the present embodiment has the above-described configuration, and the operation of this intercom system will be described based on the state transition diagrams of FIGS. First, the operation when the master unit 1 of each household A1, A2 is switched to the independent household mode according to the operation of the operation unit 14 will be described based on FIG. In the initial state, the switch SW1 is on and the switch SW2 is off.

  When the householder of the parent household A1 performs an operation of switching the operation mode to the independent household mode using the operation unit 14 of the parent device 1 (processing S1), the control unit 17 of the parent device 1 receives an operation input from the operation unit 14. Based on this, the operation mode is switched to the independent household mode (processing S2). Also, in the child household A2, it is assumed that the operation mode of the parent device 1 is switched to the independent household mode (processing S3).

  Thereafter, when there is a visitor in the child household A2, and the visitor presses the call button 3a of the doorphone slave unit 3 (processing S4), the doorphone slave unit 3 sets the line voltage of the signal line Ls1 to be lower than the standby power supply state. The call signal is transmitted to the base unit 1 by reducing the voltage to a low voltage (step S5). In the base unit 1, the call signal receiving circuit 15 detects the call signal by monitoring the line voltage of the signal line Ls1, and when the call signal is received and output to the control unit 17, the control unit 17 switches the switch SW1. Is turned off to interrupt the transmission and reception of video signals between other households (processing S6), and the control unit 17 shifts the power supply voltage to the signal line Ls1 from the standby power supply state to the operation power supply state. Activate the camera. At this time, the control unit 17 causes the control / sound modulation / demodulation circuit 11 to ring the calling signal from the speaker 10b and to output a control signal for ringing the calling signal to the demultiplexing circuit 16c so that the control signal is frequency-multiplexed. Thus, the ringing tone is also sounded from the secondary master units 2a to 2n. The control unit 17 outputs a control signal for assigning time slots to the doorphone sub unit 3 and the camera sub unit 4 from the control / sound modulation / demodulation circuit 11, and the demultiplexing circuit 16a multiplexes and transmits the control signal. Synchronization is established with the intercom unit 3 (processing S7). When the intercom unit 3 returns a video signal in the time slot assigned to the intercom unit 3 (processing S8), it is separated by the demultiplexing circuit 16b. The video signal is amplified by the amplifier 20a and sent to the video modulation / demodulation circuit 13. The video modulation / demodulation circuit 13 demodulates and reconstructs the original video, whereby the video of the slave unit is displayed on the monitor 12.

  The video signals separated by the demultiplexing circuit 16b of the master unit 1 are amplified by the amplifiers 20a and 20b, sent to the demultiplexing circuit 16d, and multiplexed again by the demultiplexing circuit 16d to be sub-mastered units 2a to 2a. Since it is output to 2n, it is possible to display the image of the slave unit on the monitors of the secondary master units 2a to 2n (processing S9). After that, when the response button is pressed on the master unit 1 or the sub master units 2a to 2n, a communication path is formed between the master unit 1 or the sub master units 2a to 2n and the doorphone slave unit 3, and the intercom call is made. Done. Then, when the call between the parent device 1 or the sub-parent devices 2a to 2n and the door phone child device 3 is finished (processing S10), the control unit 17 turns on the switch SW1 to return to the initial state (processing S11). ).

  In addition, the process (process S12-S18) when there is a visitor in the parent household A1 and makes a doorphone call between the doorphone cordless handset 3 and the parent device 1 of the parent household A1 is the above-described call processing in the child household A2. Since it is the same as (Processes S4 to S11), detailed description is omitted.

  As described above, in this system, when there is a call from the doorphone sub unit 3 of the own household or an environmental change detected by the camera sub unit 4 while operating in the independent household mode, the control unit 17 of the main unit 1 turns off the switch SW1. Therefore, it is possible to prevent the video taken by the doorphone sub unit 3 or the camera sub unit 4 of the own household from being output to the main unit 1 of another household, and to ensure privacy between households.

  Next, the operation when the master unit 1 of each household A1, A2 is switched to the two-household mode will be described with reference to FIG. In the initial state, the switch SW1 is in an on state and the switch SW2 is in an off state.

  When the householder of the parent household A1 performs an operation of switching the operation mode to the two-household mode using the operation unit 14 of the parent device 1 (processing S21), the control unit 17 of the parent device 1 receives an operation input from the operation unit 14. Based on this, the operation mode of the own device is switched to the two-household mode (processing S22). Note that the switch SW1 remains on and the switch SW2 remains off. Further, the master unit 1 of the parent household A1 outputs a control signal (switching signal) for switching the operation mode to the two-household mode from the control / sound modulation / demodulation circuit 11 to the demultiplexing circuit 16c, and this control signal is transmitted to the demultiplexing circuit 16c by the frequency. The signals are multiplexed and output to the parent device 1 of the child household A2 via the signal line Ls3 (processing S23). In the master unit 1 of the child household A2, the demultiplexing circuit 16c separates the control signal from the multiplexed signal input via the signal line Ls3 and outputs the control signal to the control / sound modulation / demodulation circuit 11, and receives and controls this control signal. The unit 17 switches the operation mode of the own device to the two-household mode, turns off the switch SW1, and turns on the switch SW2 (processing S24). Here, since the switch SW1 of the parent household A1 is on and the switch SW2 of the child household is on, the video signal from the parent device 1 of the parent household A1 is transmitted to the parent device 1 of the child household A2. It is possible to receive.

  In this state, when there is a visitor in the parent household A1, and the visitor presses the call button 3a of the door phone sub unit 3 (processing S25), the door phone sub unit 3 changes the line voltage of the signal line Ls1 from the standby power supply state. The call signal is transmitted to the base unit 1 by lowering the voltage to a lower voltage (step S26). In the base unit 1, the call signal receiving circuit 15 detects the call signal by monitoring the line voltage of the signal line Ls1, and when the call signal is received and output to the control unit 17, the control unit 17 outputs the signal line. The power supply voltage to Ls1 is shifted from the standby power supply state to the operation power supply state, the camera is started by the doorphone slave unit 3, and the calling signal is sounded from the speaker 10b by the control / sound modulation / demodulation circuit 11. In addition, the control unit 17 outputs a control signal for ringing the secondary master units 2a to 2n to the demultiplexing circuit 16c, frequency-multiplexes by the demultiplexing circuit 16c, and transmits it to the secondary master units 2a to 2n. Ringing sounds are generated from the master units 2a to 2n. The control unit 17 outputs a control signal for calling the master unit 1 of the child household A2 from the control / voice modulation / demodulation circuit 11 to the demultiplexing circuit 16c, and the demultiplexing circuit 16c frequency-multiplexes the control signal. It transmits to the main | base station 1 of child household A2 via signal wire | line Ls3 (process S27). The base unit A2 of the child household separates the control signal from the multiplexed signal by the demultiplexing circuit 16c and outputs the control signal to the control / sound modulation / demodulation circuit 11, and the control unit 17 receives the control signal so that the control / sound The modulation / demodulation circuit 11 causes the speaker 10b to ring the calling signal and outputs a control signal for ringing the secondary master units 2a to 2n to the demultiplexing circuit 16c. The demultiplexing circuit 16c frequency-multiplexes the secondary master unit 2a to 2n. 2n, and ringing sounds are generated from the sub-master units 2a to 2n (step S28).

  Thereafter, the control unit 17 of the parent device 1 of the parent household A1 outputs a control signal for assigning a time slot to the door phone sub unit 3 and the camera sub unit 4 from the control / sound modulation / demodulation circuit 11, and this control signal is output to the demultiplexing circuit 16a. Is multiplexed and transmitted to synchronize with the intercom 3 (process S29), and when the intercom 3 returns the video signal in the time slot assigned to the self (3) (process S30). The video signal separated by the demultiplexing circuit 16b is amplified by the amplifier 20a and input to the video modulation / demodulation circuit 13, and the video modulation / demodulation circuit 13 demodulates the video signal to reconstruct the original video, thereby The video is displayed on the monitor 12. The video signal separated by the demultiplexing circuit 16b of the base unit 1 is amplified by the amplifiers 20a and 20b, input to the demultiplexing circuit 16d, and multiplexed again by the demultiplexing circuit 16d, and then the sub-master unit connection terminal. It is sent to the secondary master units 2a to 2n via T2a and sent to the master unit 1 of another household via the two-household terminal T2b (processing S31). In the parent device 1 of the child household A2, the demultiplexing circuit 16e separates the multiplexed signal input from the parent household A1 into a video signal, the amplifier 20a amplifies the video signal, and the video modulation / demodulation circuit 13 demodulates the video signal. By reconstructing the video, the video taken by the doorphone slave unit 3 of the parent household A1 is displayed on the monitor 12 of the parent device 1 of the child household A2. The video signal separated by the demultiplexing circuit 16e of the parent device 1 of the child household A2 is amplified by the amplifiers 20a and 20b, input to the demultiplexing circuit 16d, and multiplexed again by the demultiplexing circuit 16d. It is sent to the secondary master units 2a to 2n of the child household A2 via the secondary master unit connection terminal T2a (processing S32). Thus, the image of the child device (the door phone child device 3 or the camera child device 4) can be displayed on the parent device 1 and the sub-parent devices 2a to 2n of the parent household A1, and the parent device 1 and the child of the child household A2 can be displayed. Also in the secondary master units 2a to 2n of the household A2, it is possible to display an image of the slave unit (the door phone slave unit 3 or the camera slave unit 4) of the parent household A1.

  Here, when the householder of the child household A2 hears a ringing tone and presses the response button of the sub-master unit 2a, the parent household is connected between the doorphone sub-unit 3 of the parent household A1 and the sub-master unit 2a of the child household A2. A communication path is formed via the parent device 1 of A1 and the parent device 1 of the child household A2, and a door phone call is performed between the doorphone child device 3 and the sub-parent device 2a of the child household A2 (processing S33).

  Thereafter, when a call termination operation is performed on the secondary master unit 2a of the child household A2 (processing S34), the secondary master unit 2a terminates the call and shifts to a standby state. Then, a control signal for notifying the end of the call is output (step S35). In the master unit 1 of the child household A2, the control signal output from the sub master unit 2a is input to the demultiplexing circuit 16c via the sub master unit connection terminal T2a and frequency-separated by the demultiplexing circuit 16c. The signal is demodulated by the sound modulation / demodulation circuit 11 and input to the control unit 17. The control unit 17 shifts to a standby state upon completion of the extension call, and outputs a control signal for notifying the end of the call from the control / voice modulation / demodulation circuit 11, and the demultiplexing circuit 16c multiplexes the control signal into two households. The data is transmitted to the parent device 1 of the parent household A1 through the terminal T2b (processing S36). The control signal input to the two-household terminal T2b of the parent household A1 is demodulated by the control / sound modulation / demodulation circuit 11 and input to the control unit 17 after the control signal is frequency separated by the demultiplexing circuit 16c of the parent device 1. In response to the extension call termination process, the control unit 17 shifts to the standby state and switches the power supply state to the doorphone slave unit 3 to the standby power supply state (step S37). To stop and enter standby mode.

  Thus, in the two-household mode, the master unit 1 receives the video signal input from the doorphone slave unit 3 or the camera slave unit 4 of the same household via the sub-master unit connection terminals 2a to 2n. 2a to 2n and output to the master unit 1 of the other household via the sub master unit connection terminal T2, so that the master unit 1 and the sub master units 2a to 2n of the other households and the sub parents of the own household Video signals can be output to the machines 2a to 2n.

  As described above, the two-household terminal for connecting the master unit 1 of another household is also used as the sub-master unit connection terminal T2, and images from the slave units (doorphone slave unit 3 and camera slave unit 4) of other households Since it can be displayed on the monitor of the master unit 1 and the sub master units 2a to 2n in the household, a door phone system in which the circuit scale of the master unit 1 is reduced can be provided.

  The video signals from the doorphone slave unit 3 and the camera slave unit 4 in the household are separated from the multiplexed signal by the demultiplexing circuit 16b provided in the master unit 1, and amplified by the amplifier 20a and the amplifier 20b. After that, the signal is multiplexed again by the demultiplexing circuit 16d and transmitted to the parent device 1 of another household via the signal line Ls3, so that the wiring distance between the households A1 and A2 can be increased.

  Further, the video signal transmitted from the doorphone slave unit 3 and the camera slave unit 4 of another household via the master unit 1 of the other household is separated into a video signal by the demultiplexing circuit 16e, and the amplifier 20a and the amplifier After being amplified by 20b, it is multiplexed again by the multiplexing / separating circuit 16d and transmitted to the sub-master units 2a to 2n. Therefore, even if it is a video signal of another household attenuated via the signal line Ls3, It can be displayed on the secondary master unit in the same manner as signals transmitted from the doorphone slave unit 3 and the camera slave unit 4 of the household, and the wiring distance between the master unit 1 and the secondary master units 2a to 2n can be increased. It is.

1 is a schematic block diagram of an intercom system according to Embodiment 1. FIG. It is a system block diagram same as the above. It is a state transition diagram explaining operation | movement in the independent household mode same as the above. It is a state transition diagram explaining operation | movement in 2 household mode same as the above. It is a system block diagram of the conventional intercom system for two-family houses. It is a schematic block diagram same as the above.

Explanation of symbols

1 Interphone master unit 2a to 2n Interphone secondary master unit 3 Door phone slave unit (door phone with camera)
4 Camera unit 10a Microphone (calling means)
10b Speaker (calling means)
13. Video modulation / demodulation circuit (video demodulation means)
18 Camera side input point 19 Extension side input point T1 Slave unit connection terminal T2a Sub master unit connection terminal T2b Sub master unit connection terminal (two-household terminal)
SW1 switch (connection switching means)
SW2 switch (connection switching means)

Claims (4)

An intercom system that is installed in a two-family house to make an extension call within and between households,
Each household has a handset including a door phone with a camera installed outside the house, a calling means for making a call between the handset and a video display means for displaying a video taken by the handset. The interphone main unit installed and installed in the home, and a call means for making a call between the interphone main unit and the interphone main unit connected to the interphone main unit and the interphone main unit are photographed by the sub unit And interphone sub-master device provided in the house with video display means for displaying the video, respectively,
Each household interphone master unit has a slave unit connection terminal to which the slave unit is connected, a plurality of secondary master unit connection terminals to which the interphone secondary master unit is connected, and a video signal input from the slave unit connection terminal. Video demodulating means for displaying on the video display means,
One of the plurality of sub-master connection terminals is used as a two-household terminal to which an interphone master unit of another household is connected, and the camera side input point provided between the slave connection terminal and the video demodulation means, or An interphone system comprising connection switching means for selecting any of the extension side output points provided between the sub-master connection terminal and the video demodulation means and connecting the two household terminals. The intercom base unit is either a two-household mode that enables transmission / reception of signals to / from an intercom base unit of another household, or an independent household mode that blocks transmission / reception of signals to / from an intercom base unit of another household. Communication mode switching means for switching between
2. The intercom system according to claim 1, wherein in the independent household mode, the communication mode switching means switches the connection switching means so as to connect the two household terminals to the extension side output point. The intercom base unit is either a two-household mode that enables transmission / reception of signals to / from an intercom base unit of another household, or an independent household mode that blocks transmission / reception of signals to / from an intercom base unit of another household. Communication mode switching means for switching between, and an amplifier that amplifies the video signal input from the slave unit connection terminal and the sub-master unit connection terminal,
In the two-household mode, the communication mode switching means of the interphone master unit that transmits the video signal of the slave unit of the own household to the interphone master unit of another household is a connection switching means so that the two-household terminal is connected to the extension side output point The intercom system according to claim 1, wherein the intercom system is switched. The intercom base unit is either a two-household mode that enables transmission / reception of signals to / from an intercom base unit of another household, or an independent household mode that blocks transmission / reception of signals to / from an intercom base unit of another household. Communication mode switching means for switching between, and an amplifier that amplifies the video signal input from the slave unit connection terminal and the sub-master unit connection terminal,
In the two-household mode, the communication mode switching means of the interphone master that receives and displays the video signal transmitted from the interphone master of another household is a connection switching means so that the two-household terminal is connected to the camera side input point. The intercom system according to claim 1, wherein the intercom system is switched.

Images