Intercom system and call tone sounding method

Abstract

This will further improve the convenience for residents in receiving visitors. [Solution] The intercom system comprises an entrance unit installed at the front door, having at least a button to be pressed by the visitor, a camera to capture images of the visitor, and a sub-unit speaker; and an indoor master unit located inside the house, having at least a communication unit for data communication with the entrance unit, a memory to hold data for visitor facial recognition, and a master unit speaker. Upon detecting the first press of the button by the visitor, the entrance unit performs facial recognition of the visitor using the facial recognition data and image data captured by the camera. If facial recognition fails, it outputs a predetermined warning message from the sub-unit speaker and starts recording the visitor using the camera. If facial recognition fails, the indoor master unit omits the output of a call tone from the master unit speaker to announce the visitor's arrival.

Description

Technical Field

[0001] The present disclosure relates to an intercom device and a calling sound ringing method.

Background Art

[0002] Patent Document 1 discloses an intercom device provided with a residential master unit that compares whether it is the time zone stored when a call button is operated in a standby state, and if it is outside the set time zone, notifies a calling sound as a normal call, and if it is within the set time zone, controls not to notify the calling sound.

[0003] Patent Document 2 discloses an intercom system that performs face authentication by collating video data and face data of a visitor. This intercom system performs face authentication by photographing a visitor with a camera before the call button is pressed. When face authentication of a visitor with registered face data is successful, the residential master unit generates a calling sound and the entrance slave unit generates a confirmation sound. When face authentication fails due to unregistered face data and the call button is pressed, the residential master unit generates an alarm and the entrance slave unit generates an alarm. When face authentication fails because the face is unidentifiable and the call button is pressed, the residential master unit generates a silent or alarm sound and the entrance slave unit generates a caution event. When face authentication fails and the visitor does not press the call button for a certain period of time, the residential master unit generates a silent or alarm sound and the entrance slave unit generates a warning event. When face authentication is successful and a family member or the like does not intentionally press the call button for a certain period of time, the residential master unit generates a calling sound and the entrance slave unit generates a calling sound.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the configuration of Patent Document 1, if the call button is pressed during a pre-set time period, the call sound is uniformly silenced regardless of who the visitor is. This presents a problem in that residents may not notice the arrival of someone they need to confirm or respond to. Also, as in Patent Document 1 or Patent Document 2, when the call button on the outdoor unit is pressed, the indoor unit almost always sounds an alarm. In this case, residents have to check the indoor unit's screen each time someone they don't need to respond to arrives, which makes responding to visitors cumbersome.

[0006] This disclosure was devised in light of the aforementioned circumstances and aims to further improve the convenience of residents in receiving visitors. [Means for solving the problem]

[0007] This disclosure provides an intercom system comprising: an entrance station installed at the front door and having at least a button to be pressed by a visitor, a camera to capture images of the visitor, and a sub-speaker; and an indoor master station located inside the house and having at least a communication unit to communicate data with the entrance station, a memory to hold data for facial recognition of the visitor, and a master speaker, wherein the entrance station, upon detection of the first press of the button by the visitor, performs facial recognition of the visitor using the facial recognition data and image data captured by the camera, and if facial recognition fails, outputs a predetermined warning message from the sub-speaker and starts recording the visitor using the camera; and the indoor master station, if facial recognition fails, omits the output of a call tone from the master speaker to announce the visitor's arrival.

[0008] Furthermore, this disclosure provides a call sound method that is implemented by an entrance station installed at the front door and having at least a button to be pressed by a visitor, a camera to capture images of the visitor, and a sub-speaker; and an indoor master station located inside the house and having at least a communication unit to communicate data with the entrance station, a memory to hold data for facial recognition of the visitor, and a master speaker, wherein the entrance station, in response to the detection of the first press of the button by the visitor, performs facial recognition of the visitor using the facial recognition data and image data captured by the camera, and if the facial recognition fails, outputs a predetermined warning message from the sub-speaker and starts recording the visitor using the camera, and the indoor master station omits outputting a call sound from the master speaker to announce the visitor's arrival if the facial recognition fails.

[0009] These comprehensive or specific embodiments may be implemented as systems, devices, methods, integrated circuits, computer programs, or recording media, or as any combination of systems, devices, methods, integrated circuits, computer programs, and recording media. [Effects of the Invention]

[0010] This disclosure will further improve the convenience of residents in receiving visitors. [Brief explanation of the drawing]

[0011] [Figure 1] A schematic diagram illustrating an example of the operation of the intercom device according to this embodiment. [Figure 2] This figure shows an example of the system configuration of the intercom device according to this embodiment. [Figure 3] Block diagram showing example hardware configurations for the outdoor and indoor units. [Figure 4] A flowchart showing an example of the operation procedure of the intercom device according to this embodiment, in chronological order. [Modes for carrying out the invention]

[0012] Hereinafter, with appropriate reference to the drawings, embodiments specifically disclosing the intercom device and call tone sounding method according to this disclosure will be described in detail. However, unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding by those skilled in the art. The attached drawings and the following explanation are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter of the claims. Furthermore, in the following explanation, the same elements may be assigned the same reference numerals to simplify or omit explanations.

[0013] 1. Overview of the Intercom System's Operation First, with reference to Figure 1, the operation overview of the intercom device 100 (see Figure 2) according to this embodiment will be explained. Figure 1 is a schematic diagram showing an example of the operation overview of the intercom device 100 according to this embodiment. In the following explanation, as a use case of the intercom device 100 according to this embodiment, a scenario in which it determines whether or not to respond to a visitor PS1 who has come to a specific room in a private house or apartment building, and outputs a ringing sound to announce the visitor's arrival if necessary, will be used as an example. To make the explanation particularly easy to understand, the example will be given in the case where visitor PS1 has come to a private house. Needless to say, the use cases of the intercom device 100 according to this embodiment are not limited to the example shown in Figure 1.

[0014] In the intercom device 100 according to this embodiment, the door station 10 detects when a visitor PS1 presses the button 14 (see Figure 3) for the first time when the visitor PS1 visits the private residence. When the door station 10 detects that the visitor PS1 has pressed the button 14 for the first time (i.e., the first call), it performs facial recognition of the visitor PS1 using the facial recognition data (see below) stored in the indoor master unit 20 and the image data obtained by capturing the visitor PS1's face.

[0015] (Facial recognition: Failed) If facial recognition fails (for example, if visitor PS1 is a first-time visitor), the door station 10 outputs a predetermined warning message and starts recording video data of visitor PS1. The warning message may be, for example, "We will start recording. If you wish to proceed, please press the call button again," but it is not limited to this content. Furthermore, the door station 10 sends a notification to the indoor master unit 20 that facial recognition has failed. Based on this notification from the door station 10, the indoor master unit 20 omits (i.e., does not output) the sound to announce the arrival of visitor PS1.

[0016] The door station 10 detects that the visitor PS1 has pressed button 14 a second time (see Figure 3). Details on how the second press of button 14 is detected will be described later. When the door station 10 detects that the visitor PS1 has pressed button 14 a second time (i.e., a second call), it outputs a ringing sound from its speaker 17 (see Figure 3) to announce the visitor PS1's arrival and notifies the indoor master unit 20 that the visitor PS1 has pressed button 14 a second time. Based on the notification from the door station 10, the indoor master unit 20 outputs a ringing sound from its speaker 25 (see Figure 3) to announce the visitor PS1's arrival. As a result, the resident inside the house can recognize that the visitor PS1 is at the entrance by the ringing sound output from the indoor master unit 20.

[0017] (Facial recognition: Success) When face authentication is successful (for example, when the visitor PS1 is a family member, acquaintance, delivery person, etc.), the entrance unit 10 outputs a ringing sound for notifying the arrival of the visitor PS1 from the speaker 17 (see FIG. 3) of the entrance unit 10 and notifies the indoor master unit 20 that the face authentication of the visitor PS1 has been successful. Based on the reception of the notification from the entrance unit 10, the indoor master unit 20 outputs a ringing sound for notifying the arrival of the visitor PS1 from the speaker 25 (see FIG. 3) of the indoor master unit 20. As a result, the resident inside the house can recognize that there is a visitor PS1 (for example, a family member, acquaintance, delivery person, etc.) at the entrance by the output of the ringing sound from the indoor master unit 20. Further, for the visitor PS1 near the entrance unit 10, it becomes unnecessary to press the button 14 a second time, and for example, the convenience of the visitor PS1 is also improved because the resident can respond with just one press of the button 14 without the visitor PS1 having to identify themselves.

[0018] 2. Configuration of the intercom system Next, referring to FIGS. 2 and 3, a configuration example of the intercom device 100 according to the present embodiment will be described. FIG. 2 is a diagram showing a system configuration example of the intercom device 100 according to the present embodiment. FIG. 3 is a block diagram showing a hardware configuration example of the entrance unit 10 and the indoor master unit 20.

[0019] As shown in FIG. 2, the intercom device 100 according to the present embodiment includes at least an entrance unit 10 and an indoor master unit 20. The entrance unit 10 and the indoor master unit 20 are wired-connected to each other via a known wired network 50 so that data signal communication is possible between them.

[0020] The entrance sub-device 10 is an example of a doorbell-type device and is installed at the entrance of the user's individual residence HS1. The entrance sub-device 10 has at least a button 14 (see FIG. 3) pressed by the visitor PS1, a camera 13 (see FIG. 3) capable of capturing video data of the visitor PS1, and a speaker 17 as a sub-device speaker. The entrance sub-device 10 transmits a signal indicating that the button 14 has been pressed by the visitor PS1 to the indoor main device 20, or transmits a signal of the video data of the visitor PS1 captured by the camera 13 to the indoor main device 20. Details of an example of the hardware configuration of the entrance sub-device 10 will be described later with reference to FIG. 3, and the detailed operation of the entrance sub-device 10 will be described later with reference to FIG. 4.

[0021] The indoor main device 20 receives and acquires a signal indicating that the button 14 has been pressed from the entrance sub-device 10 and a signal of the video data of the visitor PS1, and executes various processes (for example, output of a ringing sound to announce the visit of the visitor PS1, display of video data) based on this data signal. Details of an example of the hardware configuration of the indoor main device 20 will be described later with reference to FIG. 3.

[0022] (Entrance sub-device 10) As shown in FIG. 3, the entrance sub-device 10 includes a ROM 11, a RAM 12, a camera 13, a button 14, a control unit 15, a microphone 16, and a speaker 17. The ROM 11, RAM 12, camera 13, button 14, microphone 16, and speaker 17 are each connected via an internal bus or the like so that signals can be input and output between them and the control unit 15.

[0023] The ROM 11 is a Read Only Memory and holds programs and data necessary for the operation of the entrance sub-device 10. The RAM 12 is a Random Access Memory (RAM) and is a work memory that temporarily holds data signals acquired or generated by the control unit 15 during operation.

[0024] Camera 13 is positioned at the entrance of the user's private home HS1 to which the door station 10 is installed, and is an imaging device that primarily captures images of people approaching the entrance (for example, visitors PS1). Camera 13 sends the video data signal obtained from the imaging to the control unit 15.

[0025] Button 14 is a so-called call button, and it is a button that triggers the determination of whether or not to output a sound (e.g., "ding-dong") to indicate that a person (e.g., visitor PS1) has arrived in front of the door station 10. When button 14 is pressed, a signal indicating that it has been pressed is transmitted to the control unit 15, and the control unit 15 can detect that someone has pressed button 14. Note that button 14 is not limited to a button for outputting a sound.

[0026] The control unit 15 is composed of at least one processor, such as a Central Processing Unit (CPU), Digital Signal Processor (DSP), Field Programmable Gate Array (FPGA), or Graphical Processing Unit (GPU). The control unit 15 functions as a controller that oversees the overall operation of the door station 10. The control unit 15 performs control processing to coordinate the operation of each part of the door station 10, input / output processing of data signals between each part of the door station 10, arithmetic processing of data signals, and storage processing of data signals. The control unit 15 operates according to the program stored in the ROM 11. When operating, the control unit 15 uses the ROM 11 to perform various processes in cooperation with the control unit 15 and temporarily stores the data signals generated or acquired by the control unit 15 in the RAM 12. The control unit 15 also transmits the generated or acquired data signals to the indoor master unit 20.

[0027] The microphone 16 is a sound-collecting device that picks up sound from in front of the location where the door station 10 is installed (for example, the sound emitted by visitor PS1 who presses button 14). The data signal of the sound picked up by the microphone 16 is transmitted to the control unit 15. The speaker 17 acoustically outputs the sound transmitted (transmitted) from the indoor master unit 20 (for example, the sound emitted by resident P1 inside the house).

[0028] (Indoor master unit 20) As shown in Figure 3, the indoor master unit 20 includes a ROM 21, a RAM 22, a door station communication I / F unit 23, a microphone 24, a speaker 25, a display / operation unit 26, a control unit 27, an audio signal input / output control unit 28, an audio signal bus 29, a wireless LAN communication I / F unit 30, and an antenna 31. The ROM 21, RAM 22, door station communication I / F unit 23, audio signal input / output control unit 28, and wireless LAN communication I / F unit 30 are each connected to the control unit 27 via an internal bus including the audio signal bus 29, etc., to enable signal input and output.

[0029] ROM21 is Read Only Memory and holds the programs and data necessary for the operation of the indoor master unit 20. RAM22 is Random Access Memory (RAM) and is a work memory that temporarily holds data signals acquired or generated by the control unit 27 during operation.

[0030] The door station communication interface 23 is configured using an integrated circuit that performs data signal communication between the indoor master unit 20 and the door station 10. The door station communication interface 23 receives data signals from the door station 10 and transmits data signals to the door station 10. As described above, data signal communication between the door station 10 and the indoor master unit 20 is achieved by wired communication.

[0031] Microphone 24 is a sound-collecting device that captures voices emitted by people (e.g., residents) inside the user's private home HS1. The voice data signal captured by microphone 24 is transmitted to the sound signal input / output control unit 28. Speaker 25 acoustically outputs the voice captured by the door station 10 (e.g., the voice of visitor PS1) via the door station communication interface 23, control unit 27, sound signal bus 29, and sound signal input / output control unit 28.

[0032] The display / operation unit 26 is a display configured using, for example, a Liquid Crystal Display (LCD) or an organic EL element, and receives user input (i.e., the person operating the indoor master unit 20) and sends a signal corresponding to that input to the control unit 27. The display / operation unit 26 may be configured as a touch panel display and, for example, displays video data from the camera 13 sent from the door station 10 (for example, video from the visitor PS1).

[0033] The control unit 27 is composed of at least one processor, such as a Central Processing Unit (CPU), Digital Signal Processor (DSP), Field Programmable Gate Array (FPGA), or Graphical Processing Unit (GPU). The control unit 27 functions as a controller that oversees the overall operation of the indoor master unit 20. The control unit 27 performs control processing to coordinate the operation of each part of the indoor master unit 20, input / output processing of data signals between the indoor master unit 20 and each part, arithmetic processing of data signals, and storage processing of data signals. The control unit 27 operates according to the program stored in the ROM 21. When operating, the control unit 27 uses the ROM 21 to perform various processes in cooperation with the control unit 27 and temporarily stores the data signals it generates or acquires in the RAM 22. The control unit 27 also transmits (transmits) the generated or acquired data signals to the entrance sub-unit 10 or displays them on the display / operation unit 26.

[0034] The sound signal input / output control unit 28 receives the voice of a person (for example, a resident in the user's private home HS1) picked up by the microphone 24 and transmits it directly to the control unit 27 or to the wireless LAN communication I / F unit 30 via the sound signal bus 29. The sound signal input / output control unit 28 acoustically outputs the voice data signal from the control unit 27 through the speaker 25.

[0035] The audio signal bus 29 is an internal bus through which audio signals input to the control unit 27 and audio signals sent from the control unit 27 to other parts pass, and it performs audio signal input and output between the control unit 27, the audio signal input / output control unit 28, and the wireless LAN communication I / F unit 30.

[0036] The wireless LAN communication interface 30 is configured using an integrated circuit that communicates data signals with external devices connected via a wireless Local Area Network (LAN) (for example, a smartphone owned by a resident in the user's private home HS1). The wireless LAN communication interface 30 receives data signals from external devices (see above) and sends them to the control unit 27 or the sound signal input / output control unit 28 via the sound signal bus 29, or transmits the data signals sent to external devices (see above) via the sound signal bus 29 via the antenna 31.

[0037] 3. Operation of the intercom system Next, the operation of the intercom device 100 according to this embodiment will be described with reference to Figure 4. Figure 4 is a sequence diagram showing an example of the operation procedure of the intercom device 100 according to this embodiment in chronological order. The various processes shown in Figure 4 below will be described assuming that they are mainly performed by the control unit 15 of the outdoor unit 10, but the control unit 27 of the indoor master unit 20 may perform them instead of the control unit 15 of the outdoor unit 10.

[0038] In Figure 4, the control unit 15 detects whether or not the button 14 (e.g., the call button) on the door station 10 has been pressed by the visitor PS1 (St1). If the control unit 15 detects that the button 14 (e.g., the call button) on the door station 10 has been pressed by the visitor PS1 (St1, YES), it determines whether or not the current time is within a predetermined period set in the second-press wait timer (St2). This second-press wait timer has a predetermined period set in advance and is used to determine whether or not the button 14 has been pressed again (i.e., a second time) within that predetermined period. In other words, even if it is a second press, if the press occurs after the predetermined period has elapsed since the start of the timer, the control unit 15 will determine that the second press is the first press. Therefore, if there are two presses within the predetermined period set as the second-press wait timer, the second press will be correctly determined to be the second press and not the first press. The predetermined period, which is the setting value of this second-press wait timer, is stored in, for example, ROM 11 or RAM 12.

[0039] If the control unit 15 determines that the current time is outside the predetermined period of the second waiting timer (i.e., the button 14 was pressed for the first time) (St2, NO), it performs facial recognition using the video data of visitor PS1 captured by camera 13. In other words, the control unit 15 acquires the facial recognition data held by the indoor master unit 20 (for example, image data of the face portion of each person such as pre-registered family members, acquaintances, or delivery personnel, or data indicating the feature quantities of that image), and performs facial recognition by comparing it with the video data of visitor PS1 captured by camera 13. If facial recognition fails, that is, if the visitor PS1's face is not registered in the facial recognition data (St3, NO), the control unit 15 sets (starts) the timing of the second waiting timer (an example of a predetermined timer) (St4). After step St4, the control unit 15 outputs a predetermined warning message (see Figure 1) from the speaker 17 of the entrance unit 10 and starts recording video data of visitor PS1 using camera 13 (St5). After this, the control unit 15 returns to step St1.

[0040] On the other hand, if the control unit 15 determines that the current time is within the predetermined period of the second waiting timer (i.e., the button 14 has been pressed for the second time) (St2, YES), it performs the process of step St6. Specifically, the control unit 15 cancels the setting of the predetermined period of the second waiting timer (St6). Also, after step St6 or if facial recognition is successful, that is, if the control unit 15 determines that the visitor PS1's face has already been registered (St3, YES), it sounds a ringtone from the speaker 17 to indicate that the visitor PS1 has arrived at the user's private residence HS1, and starts recording video data of the visitor PS1 using the camera 13 (St7). After step St7, the control unit 15 returns to step St1.

[0041] Furthermore, if the control unit 15 determines that the button 14 on the door station 10 (for example, the call button) has not been pressed by the visitor PS1 (St1, NO), it determines whether the current time is the timeout for the second waiting timer (i.e., the set predetermined period has elapsed) (St8). If it determines that the current time is not the timeout for the second waiting timer (St8, NO), the control unit 15 returns to step St1.

[0042] On the other hand, if the control unit 15 determines that the current time is up for the second waiting timer (i.e., the set predetermined period has elapsed) (St8, YES), it stops the second waiting timer because there is no need to keep time (St9). After this, the control unit 15 returns to step St1.

[0043] (Summary of this disclosure) The above description of embodiments discloses the technical concepts corresponding to the following items.

[0044] (Item 1) The intercom device related to this disclosure is An entrance station (10) is installed at the front door and has at least a button (14) that is pressed by a visitor (PS1), a camera (13) that captures an image of the visitor, and a sub-speaker (speaker 17), The system includes an indoor master unit (20) located inside the user's home (user's individual home HS1), which has at least a communication unit (door station communication I / F unit 23) for data communication with the door station, a memory (ROM 21, RAM 22) for storing data for facial recognition of the visitor, and a master unit speaker (speaker 25), The aforementioned door station is Upon detection of the first press of the button by the visitor, the system performs facial recognition of the visitor using the facial recognition data and the image data captured by the camera. If facial recognition fails, a predetermined warning message is output from the sub-unit speaker, and recording of the visitor is started using the camera. The aforementioned indoor master unit is If the facial recognition fails, the output of the ringtone from the master unit speaker to announce the visitor's arrival will be omitted. As a result, the intercom system can output a predetermined warning message if facial recognition of a visitor fails, providing a warning and allowing the visitor's appearance to be recorded. Furthermore, since the indoor master unit does not ring at this point, there is no need to determine whether the visitor requires attention, further improving the convenience of residents in answering visitors.

[0045] (Item 2) In the intercom device described in item 1, In response to the detection by the door station that the visitor has pressed the button a second time, the indoor master unit outputs a call tone from the master unit speaker to announce the visitor's arrival. As a result, according to the intercom system, even if facial recognition of a visitor fails, a second button press increases the likelihood that the visitor has business at the user's home, thus increasing the need for the resident to respond to the visitor.

[0046] (Item 3) In the intercom system described in item 1, When facial recognition is successful, the door station outputs a ringtone from its speaker to indicate the visitor's arrival and sends a notification to the indoor master unit that facial recognition was successful. Upon detecting a notification that the facial recognition has been successful, the indoor master unit outputs a ringing tone from its speaker to announce the visitor's arrival. As a result, the intercom system can notify residents of a visitor's arrival if facial recognition is successful, allowing residents to properly recognize that a visitor who requires their attention has arrived.

[0047] (Item 4) In the intercom device described in item 1, The aforementioned door station is In response to the output of the predetermined warning message, the timer starts counting. If the button is pressed by the visitor before the predetermined timer period ends, it is determined to be a second press. If the button is pressed by the visitor after the predetermined timer period has ended, it is determined to be the first press. As a result, the intercom system can appropriately determine whether the button pressed on the door station is the first or second time by introducing a predetermined timer (second-time waiting timer).

[0048] (Item 5) The ringing sound method relating to this disclosure is: An entrance intercom unit installed at the front door, having at least a button to be pressed by visitors, a camera to capture images of the visitors, and a sub-speaker, The system is implemented by an indoor master unit, which is located inside the house and has at least a communication unit that communicates data with the door station, a memory that stores data for facial recognition of the visitor, and a master unit speaker. The aforementioned door station is Upon detection of the first press of the button by the visitor, the system performs facial recognition of the visitor using the facial recognition data and the image data captured by the camera. If facial recognition fails, a predetermined warning message is output from the sub-unit speaker, and recording of the visitor is started using the camera. The aforementioned indoor master unit is If the facial recognition fails, the output of the ringtone from the master unit speaker to announce the visitor's arrival will be omitted. Method for sounding the ringtone. As a result, with this ringtone method, if facial recognition of a visitor fails, a predetermined warning message is output to alert the resident, and the visitor's behavior can be recorded. Furthermore, since the ringtone does not sound on the indoor master unit at this point, there is no need to determine whether the visitor requires attention at that time, further improving the convenience of visitors for residents.

[0049] While embodiments have been described above with reference to the attached drawings, this disclosure is not limited to such examples. It is clear to those skilled in the art that various modifications, alterations, substitutions, additions, deletions, and equivalents can be conceived within the scope of the claims, and these are also understood to fall within the technical scope of this disclosure. Furthermore, the components of the embodiments described above can be combined in any way without departing from the spirit of the invention. [Industrial applicability]

[0050] The technology disclosed herein is useful as an intercom system and a call sounding method that further improves the convenience of residents in answering visitors. [Explanation of Symbols]

[0051] 10 Door station 11 ROM 12 RAM 13 Cameras 14 buttons 15 Control Unit 16 Mike 17 speakers 20 Indoor Master Unit 21 ROM 22 RAM 23. Entrance Station Communication I / F Section 24 Mike 25 speakers 26 Display / operation section 27 Control Unit 28 Audio signal input / output control unit 29. Tone signal bus 30 Wireless LAN communication I / F section 31 Antenna 50 Wired Network

Claims

1. An entrance intercom unit installed at the front door, having at least a button to be pressed by visitors, a camera to capture images of the visitors, and a sub-speaker, The system comprises an indoor master unit located inside the house, which has at least a communication unit that communicates data with the door station, a memory that stores data for facial recognition of the visitor, and a master unit speaker. The aforementioned door station is Upon detection of the first press of the button by the visitor, the system performs facial recognition of the visitor using the facial recognition data and the image data captured by the camera. If facial recognition fails, a predetermined warning message is output from the sub-unit speaker, and recording of the visitor is started using the camera. The aforementioned indoor master unit is If the facial recognition fails, the output of the ringtone from the master unit speaker to announce the visitor's arrival will be omitted. Intercom system.

2. The indoor master unit, upon detecting the visitor's second press of the button by the door station, outputs a call tone from the master unit speaker to indicate the visitor's arrival. The intercom device according to claim 1.

3. When facial recognition is successful, the door station outputs a ringtone from its speaker to indicate the visitor's arrival and sends a notification to the indoor master unit that facial recognition was successful. Upon detecting a notification that facial recognition has been successful, the indoor master unit outputs a ringing tone from its speaker to announce the visitor's arrival. The intercom device according to claim 1.

4. The aforementioned door station is In response to the output of the predetermined warning message, the timer starts counting. If the button is pressed by the visitor before the predetermined timer period ends, it is determined to be a second press. When the button is pressed by the visitor after the predetermined timer period has ended, it is determined to be the first press. The intercom device according to claim 1.

5. An entrance intercom unit installed at the front door, having at least a button to be pressed by visitors, a camera to capture images of the visitors, and a sub-speaker, The system is implemented by an indoor master unit, which is located inside the house and has at least a communication unit that communicates data with the door station, a memory that stores data for facial recognition of the visitor, and a master unit speaker. The aforementioned door station is Upon detection of the first press of the button by the visitor, the system performs facial recognition of the visitor using the facial recognition data and the image data captured by the camera. If facial recognition fails, a predetermined warning message is output from the sub-unit speaker, and recording of the visitor is started using the camera. The aforementioned indoor master unit is If the facial recognition fails, the output of the ringtone from the master unit speaker to announce the visitor's arrival will be omitted. Method for sounding the ringtone.

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