JP2006222885A - Interphone system for multiple dwelling houses, and common space apparatus thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent notification sounds and notification messages at night from becoming noise to neighboring houses. <P>SOLUTION: If an ambient illuminance is higher than a prescribed threshold, a control unit 20 judges based on a detection signal of a detector 28 that it is the daytime and discriminates that it is the night-time if it is lower than the prescribed threshold. If it is discriminated as being night-time, a common space apparatus (lobby interphone 2) lowers an amplification degree of a variable amplifier A2 down to a lower value than the value, when it is discriminated as being daytime. The informing sound and the informing message at night are prevented from becoming the noise to the neighboring houses, as a sound volume of the informing sound and the informing message, accompanied with an operation of number keys or the like, is lowered at night as compared with the sound volume during daytime. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an assembly that enables communication by alternatively establishing a communication path between a common unit device installed at a common entrance of an apartment house and any one of the dwelling units installed in each dwelling unit. The present invention relates to a residential intercom system and a shared device.

  Conventionally, a common unit (lobby intercom) installed at the common entrance of an apartment house and capable of voice input and output, and a common unit installed at each dwelling unit of an apartment house are connected via a transmission line and shared. A plurality of dwelling units (such as an interphone master unit and a housing information panel) that establish communication paths with the shared unit device when a visitor selects a selection means (such as a numeric keypad) that the unit device has. In addition, an intercom system for collective housing is provided that includes a doorphone cord unit installed in each dwelling unit of the apartment building and connected to the dwelling unit through a cordless handset connection line (for example, Patent Document 1). reference).

Here, in the shared unit device, when a visitor operates the numeric keypad to input a dwelling unit number, a notification sound (for example, an operation sound called “beep”) is generated to notify that a key operation has been accepted. ing. Alternatively, when the resident of the dwelling unit returns home, he / she can enter the dwelling unit number of the home and enter a specific key to notify the resident, for example, the collective housing manager keeps the package delivered to the resident. It is also possible to notify a message to the effect.
JP 2004-88413 A

  By the way, in the conventional shared device, since the notification sound and the notification message are generally emitted at a volume that can be heard even in the daytime when the ambient noise is larger than that at night, the ambient noise is relatively low at night. However, the volume of the notification sound and the notification message may be too high, resulting in noise for neighboring dwelling units.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a common unit device for an intercom system for collective housing and a collective unit that prevent a notification sound or a notification message from becoming noise to neighboring dwelling units at night. It is to provide a residential intercom system.

  In order to achieve the above object, the first aspect of the present invention is to connect the common unit device installed in the common entrance of the apartment house and the common unit device installed in each dwelling unit of the apartment house via a transmission line. And a common unit used in an intercom system for a collective housing comprising a plurality of dwelling units that establish a communication path with the common unit device when the selection means of the common unit device is selected by a visitor. A communication device for making a call with a dwelling unit via the communication path, and a notification sound for notifying the operation of the selection unit and a notification message for a resident of each dwelling unit The sound generation means, the determination means for determining the daytime and the night, and the volume of the notification sound and the notification message generated by the notification sound generation means when the determination means determines that it is night, compared to the daytime. Characterized in that a volume control unit.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the discriminating means has a clock function and discriminates between daytime and nighttime according to time.

  According to a third aspect of the present invention, in the first aspect of the invention, the discrimination means has an illuminance detection function for detecting ambient illuminance, and distinguishes between daytime and nighttime according to the detected ambient illuminance.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the discrimination means has an ambient sound detection function for detecting ambient sounds, and discriminates between daytime and nighttime according to the magnitude of the detected ambient sounds. Features.

  According to a fifth aspect of the present invention, in any of the first to fourth aspects of the present invention, the volume adjusting means includes a variable amplifier that has a variable amplification degree and amplifies an electrical signal of a notification sound or a notification message. And

  In order to achieve the above object, a sixth aspect of the invention is characterized by comprising the shared unit device according to any of the first to fifth aspects and a plurality of the dwelling units.

  According to the first aspect of the invention, the discriminating unit discriminates between daytime and nighttime, and the volume adjusting unit compares the volume of the notification sound and the notification message generated by the notification sound generating unit when it is discriminated at night compared with the daytime. Therefore, it is possible to prevent the notification sound and the notification message from becoming noise to neighboring dwelling units at night.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, discrimination between daytime and nighttime can be easily performed without being affected by the brightness due to the weather.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1, discrimination between daytime and nighttime can be easily performed without being affected by a change in length between daytime and nighttime according to the season or a clock error. .

  According to the invention of claim 4, in addition to the effect of the invention of claim 1, when the ambient noise is low even during the daytime, the sound of the notification sound and the notification message is reduced in the same manner as at night to thereby notify the notification sound and the notification message. Can be reliably prevented from causing noise to neighboring dwelling units.

  According to the fifth aspect of the present invention, in addition to the effect of any of the first to fourth aspects, the volume of the notification sound and the notification message can be easily changed by changing the amplification factor of the variable amplifier.

  According to the sixth aspect of the invention, since the shared device according to any one of the first to fifth aspects is provided, it is possible to prevent the notification sound and the notification message from becoming noise to neighboring dwelling units at night. Intercom system for collective housing can be provided.

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

  An example of the system configuration of this embodiment is shown in FIG. In the present embodiment, a common unit device (lobby interphone) 2 installed at a common entrance of an apartment house and a plurality of units (only one in the figure) installed at each dwelling unit 4 are provided. 2 and the dwelling unit 4 are connected via a transmission line. The transmission line includes a trunk line L1 connected to the lobby intercom 2 and a separate unit line L2 connected to each dwelling unit 4, and an alarm monitoring panel 1 installed in a manager's room of the apartment house is connected to the trunk line L1. Connected to. As this transmission line, a multi-pair twisted pair cable having three or more pairs in the sheath is used, and although not shown, a communication line La for transmitting an audio signal between the lobby intercom 2 and the dwelling unit 4. And a video line Lb for transmitting a video signal picked up by the camera 26 provided in the lobby intercom 2 and a control signal for designating the dwelling unit 4 selected by the selection means (described later) of the lobby intercom 2 are transmitted. A pair line is used for each of the control lines Lc. That is, the transmission line of the illustrated example uses three pairs of pair wires. Here, the video signal transmitted through the video line Lb is frequency-modulated in the lobby intercom 2 and is frequency-demodulated by the video processing unit 43 provided in each dwelling unit 4 and displayed on the monitor unit 45 as will be described later. .

  As shown in FIG. 1, the lobby interphone 2 is a microphone 24a and a speaker 24b for inputting / outputting voice, and a voice signal transmitted from the dwelling unit 4 via the telephone line La is signal-processed and output to the speaker 24b. The voice signal input from 24a is signal-processed and sent to the call line La, a call processing unit 25 that realizes a hands-free call, a camera 26 that images a visitor, and a video signal output from the camera 26 is frequency-modulated. Then, the video processing unit 27 for transmitting via the video line Lb, the operation switch unit 22 having a number key and a call button for designating the dwelling unit number, the dwelling unit number designated by the operation switch unit 22 and the like are displayed. A display unit 23, a detection unit 28 for detecting ambient illuminance, a notification sound for notification of an operation of the operation switch unit 22, and a notification message to be described later A notification sound generation unit 29 that generates and outputs to the speaker 24b, a control unit 20 that controls the operation of each of the above-described units using the CPU as a main component, a transmission / reception unit 21 that interfaces the control unit 20 and the control line Lc, An amplifier A1 that amplifies the audio signal output from the microphone 24a and a variable amplifier A2 that amplifies the audio signal output to the speaker 24b are provided. That is, when the visitor operates the number button of the operation switch unit 22 as a selection means and selects the visited house number, and operates the call button, the dwelling unit 2 corresponding to the house number is selected. At that time, a notification sound (for example, an operation sound called “beep”) for notifying that the number key or the call button is operated is generated by the notification sound generation unit 29, and the generated notification sound is generated by the variable amplifier A2. After being amplified, it is sounded by the speaker 24b. Here, the alarm intercom 2 is connected to the lobby intercom 2 via the telephone line La and the control line Lc, and the dwelling unit number selected on the lobby intercom 2 is transmitted to the alarm intercom 1 via the control line Lc. Then, the alarm monitoring panel 1 sends a control signal (call command) to the dwelling unit 4 corresponding to the dwelling unit number via the control line Lc.

  The detection unit 28 includes a photoelectric conversion element or a solar battery, and outputs a detection signal corresponding to the ambient illuminance of the common entrance where the lobby intercom 2 is installed to the control unit 20. Based on the detection signal of the detection unit 28, the control unit 20 determines that the ambient illuminance is higher than a predetermined threshold value, and determines that it is daytime if it is low. The amplification degree of the amplifier A2 is lowered. That is, in the present embodiment, the control unit 20 and the detection unit 28 constitute a discrimination unit, and the variable amplifier A2 and the control unit 20 constitute a volume adjustment unit.

  On the other hand, as shown in FIG. 3, the dwelling unit 4 includes a microphone 41a and a speaker 41b for inputting and outputting audio, and the microphone 41a and the speaker 41b are connected to the call processing unit 42, respectively. The call processing unit 42 is connected to a two-wire four-wire conversion unit (not shown) that converts each transmission path on the receiving side and transmission side and the two-wire communication line La to two-wire four-wire. The call processing unit 42 compares the level of the voice signal (received signal) transmitted via the call line La and the level of the voice signal (transmitted signal) output from the microphone 41a to determine the call state (received state or transmitted state). When a call state is estimated, a loss is inserted into the transmission path of the transmission signal, and when a transmission state is estimated, a loss is inserted into the transmission path of the reception signal. And an echo canceller for erasing acoustic echo generated by acoustic coupling between the microphone 41a and the speaker 41b. However, since such voice switches and echo cancellers are well known in the art, detailed illustration and description of the configuration and operation are omitted. Therefore, an audio signal can be exchanged between the lobby intercom 2 and the dwelling unit 4 through the communication line La. A visitor uses the lobby intercom 2 and a resident uses the dwelling unit 4, so that Voice calls can be made with a person.

  Further, in the dwelling unit 4, the communication line La and the video line Lb of the dwelling unit separate line L2 are respectively transmitted through a transmission path (hereinafter referred to as “call path”) of a call signal (a reception signal and a transmission signal) and a video signal. A trunk interface (not shown) that separates the routes is provided. The video signal transmission path is connected to the video processing unit 43, and the speech path is alternatively switched and connected to the call processing unit 42 and the slave unit interface unit 44. The door phone sub unit 3 is connected to the sub unit interface unit 44 through a sub unit connection line L3. The intercom unit 3 is arranged at the entrance of each dwelling unit of the apartment house and includes a microphone and a speaker. The sub unit interface unit 44 includes a bidirectional audio amplifying circuit and a communication unit for calling with the intercom unit 3. An open / close circuit for connecting the roads is provided. Therefore, in a state where the communication path is connected to the handset interface unit 44, a call between the doorphone handset 3 and the dwelling unit 4 is possible. Also, the doorphone slave unit 3 is provided with a television camera, and the slave unit interface unit 44 separates the audio signal and the video signal transmitted via the slave unit connection line L3 and sends the separated video signal to the video processing unit 43. The data can be output and displayed on the monitor unit 45. Further, the doorphone sub unit 3 is provided with a call button, and has a function of sending a call signal to the sub unit connection line L3 when the call button is operated. The dwell unit 4 has a notification sound when the call signal is detected. The ringing tone generated by the generation unit 46 is transmitted from the speaker 41b.

  In the dwelling unit 4, a liquid crystal display is used for the monitor unit 45. The video signal input to the dwelling unit 4 through the video line Lb is balanced-unbalanced converted by the main line interface, further amplified by an amplifier, and then frequency demodulated by the video processing unit 43. The video signal input to the dwelling unit 4 through the slave unit connection line L3 is also balanced-unbalanced converted by the slave unit interface unit 44, further amplified by an amplifier, and then frequency demodulated by the video processing unit 43. The video signal output from the video processing unit 43 is input to the monitor unit 45, thereby displaying a video on the screen of the monitor unit 45. That is, since the image of the visitor imaged by the camera of the lobby intercom 2 or the door phone slave unit 3 is displayed on the monitor unit 45 of the dwelling unit 4, the resident in the dwelling unit can confirm the visitor. . In addition, the notification sound generation unit 46 generates a notification sound for notifying a call from the lobby interphone 2 or the door phone sub unit 3, outputs the generated notification sound to the speaker 41 b, and uses the notification sound as a back tone. It outputs also to the separate line L2 or the subunit | mobile_unit connection line L3.

  The dwelling unit 4 is provided with a control unit 40 having a CPU as a main component and controlling an internal circuit, and a transmission / reception unit 47 serving as an interface with the control line Lc is connected to the control unit 40. The transmission / reception unit 47 has a function of sending a control signal output from the control unit 40 to the control line Lc and delivering the control signal received from the control line Lc to the control unit 40. Further, the dwelling unit 4 includes an operation switch unit 48a including a response button 48b that is operated when answering a call, and a switch input unit 48b that inputs an operation input corresponding to the operation of the operation switch unit 48a to the control unit 40. And are provided. Furthermore, the dwelling unit 4 is provided with a sensor input unit 49 that serves as an interface between the various security sensors (fire detector, gas leak detector, etc.) S installed in the dwelling unit and the control unit 40. That is, in the dwelling unit 4, when a sensor signal notifying the occurrence of an abnormality such as a fire or a gas leak is input from the security sensor S to the control unit 40 through the sensor input unit 49, the control unit 40 notifies the notification sound generation unit 46. A warning sound and a warning message for notifying the occurrence of an abnormality are generated and transmitted from the speaker 41b, and a control signal for notifying the alarm monitoring panel 1 of the occurrence of the abnormality is transmitted from the transmission / reception unit 47 via the control line Lc. The alarm monitor panel 1 is also configured to transmit an alarm for occurrence of abnormality. In addition, the dwelling unit 4 having the call function and the security function in this way is particularly called a housing information board.

  By the way, since the dwelling unit separate line L2 is branched from the trunk line L1, the control signal sent from the lobby intercom 2 via the alarm monitoring panel 1 is transmitted to all the dwelling units 4 connected to the control line Lc. Here, an address (for example, a dwelling unit number) is individually set in the control unit 40 of the dwelling unit 4, and by selecting an address in the lobby intercom 2, a control signal (call command) for designating the address is an alarm. It can be transmitted from the monitoring panel 1 to all the dwelling units 4 via the control line Lc. If the address included in the control signal is its own address, the control unit 40 of the dwelling unit 4 activates the video processing unit 43 and the monitor unit 45 to display the visitor's video captured by the camera of the lobby intercom 2. 4 and the notification sound (calling sound) generated by the notification sound generation unit 46 is transmitted from the speaker 41b. If the resident presses a response button 48b (see FIG. 2) provided on the operation switch unit 48a of the dwelling unit 4 in response to the ringing sound, the control unit 40 is connected to the communication line La. Is connected to the call processing unit 42 and a communication path is established between the lobby interphone 2 and a call can be made only between the lobby interphone 2 and the selected dwelling unit 4. It is possible to display a visitor captured by the camera only on the dwelling unit 4 on the monitor unit 45. When the dwelling unit 4 selected in the lobby intercom 2 has established a communication path with the lobby intercom 2, the end of the call using an appropriate operation button is detected in the lobby intercom 2 or the dwelling unit 4. Then it ends.

  When the call button of the doorphone sub unit 3 is pressed and a call signal is sent to the sub unit connection line L3, the control unit 40 of the dwelling unit 4 that has detected the call signal causes the video processing unit 43 and the monitor unit 45 to operate. The video of the visitor that is activated and captured by the camera of the doorphone slave unit 3 is displayed on the monitor unit 45 of the dwelling unit 4, and the notification sound (calling sound) generated by the notification sound generation unit 46 is transmitted from the speaker 41b. Let Then, if the resident presses the response button 48b of the dwelling unit 4 in response to the ringing sound, the control unit 40 switches to a state in which the communication path is connected to the slave unit interface unit 18 and between the door phone slave unit 3 By establishing the communication path, it is possible to make a call between the door phone slave unit 3 and the dwelling unit 4, and it is possible to display a visitor imaged by the camera on the monitor unit 45.

  The alarm monitoring panel 1 is installed in the manager room of the apartment house, and as shown in FIG. 4, the calling unit 14 for making a call using a handset (not shown) and the dwelling unit number of the dwelling unit 4 An operation unit 12 having a number key for inputting an alarm, an alarm sound generation unit 15 for generating an alarm sound and an alarm message for notifying the occurrence of an abnormality in the dwelling unit 4 and transmitting the alarm sound and a warning message from a speaker (not shown); , A display unit 13 for displaying the dwelling unit number designated by the operation unit 12, a control unit 10 for controlling the operation of the above-mentioned units with the CPU as a main component, and transmission / reception for interfacing the control unit 10 and the control line Lc Unit 11 and a storage unit 16 for storing a notification message or the like, which will be described later, and a function of performing a call and simultaneous broadcasting with each dwelling unit 4 via the call line La, or a dwelling unit via the control line Lc Transmitted from 4 And it has a function for issuing an alarm by receiving a control signal for notifying the normal occurrence. For example, when the administrator operates the operation unit 12 to input a dwelling unit number and then off-hooks the handset of the calling unit 14, the control unit 10 controls the dwell unit 4 corresponding to the input dwelling unit number with a control signal (call command). ) Is transmitted from the transmission / reception unit 11 to the control line Lc, and only between the selected dwelling unit 4 and the alarm monitoring panel 1 in the same manner as in the communication between the lobby intercom 2 and the dwelling unit 4 described above. A call via the call line La becomes possible. Broadcasting means that an audio signal is transmitted from the alarm monitoring panel 1 to a plurality (all or a part) of the dwelling units 4, and there is no urgent communication or evacuation guidance to each dwelling unit. For the purpose of emergency contact. For example, when performing broadcast to all the dwelling units 4 from the alarm monitoring panel 1, a control signal (simultaneous broadcast start command) instructing the start of the broadcast from the alarm monitoring panel 1 is sent to each dwelling unit via the control line Lc. In each dwelling unit 4 that is transmitted to the machine 4 and receives this control signal, the control unit 40 connects the call path connected to the call line La to the call processing unit 42 in accordance with the simultaneous broadcast start command, thereby monitoring the alarm. A communication channel is established with the panel 1, a broadcast audio signal transmitted from the alarm monitoring panel 1 is transmitted to each dwelling unit 4 via the communication line La, and a broadcast audio is transmitted from the speaker 41 b. The

  The storage unit 16 of the alarm monitoring panel 1 stores a notification message or the like input by an administrator using a handset. For example, when the administrator keeps the baggage addressed to the resident while the resident is absent, the storage unit 16 stores a message indicating that the resident unit number of the resident unit and the baggage are kept, and the resident Information stored in the storage unit 16 by the control unit 10 of the alarm monitoring panel 1 when the user enters the home unit number and a predetermined key (for example, “*”) using the operation switch unit 22 of the lobby intercom 2 The message can be read out and transmitted to the lobby intercom 2 via the telephone line La, and a notification message can be transmitted from the speaker 24b of the lobby intercom 2 to inform the dweller that the baggage is being stored. If a so-called parcel delivery box system is installed to store parcels in the absence of a resident, the delivery unit dwelling number entered by the parcel delivery company in the parcel delivery box system is transmitted to the alarm monitoring panel 1. It is also possible to automatically store the message in the storage unit 16.

  Next, the operation of the lobby intercom 2 which is the gist of the present invention will be described with reference to the flowchart of FIG.

  The control unit 20 captures the detection signal of the detection unit 28 (step 1), discriminates daytime and nighttime based on the captured detection signal (step 2). If it is determined that it is nighttime, the amplification factor of the variable amplifier A2 is set to a relatively low value (step 4). Then, the control unit 20 monitors whether or not the number key or the like of the operation switch unit 22 is operated (step 5), and when the number key or the like is operated, the notification sound generated by the notification sound generation unit 29 is changed to the variable amplifier A2. After being amplified by the above, the speaker 24b is sounded (step 6). Further, when a predetermined key (for example, “*”) is operated after the dwelling unit number, the control unit 20 transmits and receives a control signal for inquiring of the alarm monitoring panel 1 whether there is a notification message for the dwelling unit number. The part 21 is sent to the control line Lc to wait for a response from the alarm monitoring panel 1 (step 7). When a control signal indicating that there is a notification message is returned from the alarm monitoring panel 1, the control unit 20 forms a communication path with the alarm monitoring panel 1 via the communication line La and is transmitted from the alarm monitoring panel 1. The voice signal of the notification message is input to the call processing unit 25, and the notification message is amplified by the variable amplifier A2, and then the speaker 24b is sounded (step 8).

  As described above, in the shared unit device (lobby intercom 2) of the present embodiment, the control unit 20 determines that the ambient illuminance is higher than a predetermined threshold based on the detection signal of the detection unit 28, and determines that it is night when it is lower, When it is determined that it is nighttime, the amplification degree of the variable amplifier A2 is lowered than when it is determined that it is daytime, and the volume of the notification sound and notification message that accompanies the operation of the number keys and the like is decreased compared to the daytime. Therefore, it is possible to prevent the notification sound and the notification message from becoming noise for neighboring dwelling units at night.

  By the way, in this embodiment, daytime and nighttime are discriminated based on ambient illuminance. However, the control unit 20 of the lobby intercom 2 has a clock function that counts the current time, and discriminates daytime and nighttime according to the time. It doesn't matter if you do. For example, if the common entrance where the lobby intercom 2 is installed is dark even in the daytime due to location conditions, weather, etc., there is a possibility of misclassifying daytime and nighttime based on ambient illuminance. It is possible to easily distinguish between daytime and nighttime without being affected by brightness due to the like. However, discrimination based on time may be affected by changes in the length of the daytime and nighttime due to the season, clock error, etc., but if discrimination is based on ambient illuminance, There is an advantage that discrimination at night can be easily performed. Further, the level of the sound (ambient sound) collected by the microphone 24a during non-calling is compared with a reference value in the control unit 20, and if the ambient sound level exceeds the reference value, it is determined that it is daytime and the variable amplifier A2 The amplification degree may be set to a large value, and if the ambient sound level is below the reference value, it may be determined that it is night and the amplification degree of the variable amplifier A2 may be set to a small value. That is, it is generally considered that the ambient sound (ambient noise) is larger in the daytime than in the nighttime, so that the daytime and the nighttime can be distinguished according to the ambient sound level of the common entrance. Moreover, when discriminating between daytime and nighttime based on the volume of ambient sound, if the ambient noise is low even during daytime, the volume of the notification sound and notification message can be reduced in the same way as at night, so the notification sound and notification message are nearby. There is an advantage that it is possible to surely prevent noise from occurring in the dwelling unit.

It is a block diagram which shows embodiment of the shared part apparatus (lobby intercom) which concerns on this invention. It is a system configuration figure showing an embodiment of an intercom system for apartment houses concerning the present invention. It is a block diagram of the dwelling unit in the same as the above. It is a block diagram of the alarm monitoring board in the same as the above. It is a flowchart for demonstrating operation | movement of a shared part apparatus same as the above.

Explanation of symbols

2 Lobby intercom (common equipment)
20 Control Unit 21 Transmission / Transmission / Reception Unit 24b Speaker 28 Detection Unit 29 Notification Sound Generation Unit A2 Variable Amplifier

Claims (6)

  The common unit device installed in the common entrance of the apartment house and the common unit device installed in each dwelling unit of the apartment house are connected via a transmission line, and the visitor operates the selection means of the common unit device. A common unit device for use in an intercom system for a collective housing comprising a plurality of dwelling units that establish a communication path with the common unit device when selected, and the dwelling unit via the communication path A communication means for making a call between, a notification sound for notifying the operation of the selection means and a notification sound generating means for issuing a notification message for a resident of each dwelling unit, a determination means for determining daytime and nighttime, A set comprising volume adjusting means for lowering the volume of a notification sound or notification message generated by the notification sound generating means when the determination means determines that it is night, compared to daytime Common areas apparatus of the home for the intercom system.   2. The shared unit apparatus for an intercom system for an apartment house according to claim 1, wherein the determination means has a clock function and determines daytime and nighttime according to time.   The shared unit apparatus for an intercom system for an apartment house according to claim 1, wherein the determination means has an illuminance detection function for detecting ambient illuminance, and determines daytime and nighttime according to the detected ambient illuminance.   2. The intercom system for an apartment house according to claim 1, wherein the discrimination means has an ambient sound detection function for detecting ambient sounds, and discriminates between daytime and nighttime according to the detected ambient sounds. Shared equipment.   5. The intercom system for an apartment house according to claim 1, wherein the volume adjustment means has a variable amplifier that has a variable amplification level and amplifies an electric signal of a notification sound or a notification message. Shared equipment.   An intercom system for collective housing, comprising the shared unit device according to any one of claims 1 to 5 and a plurality of the dwelling units.

Images