JP2023068603A - Face-to-face call device - Google Patents

Abstract

To provide a face-to-face call device that does not require an installation construction and can be simply installed.SOLUTION: Face-to-face call devices 10 are placed at opposing positions with a partitioning member in between, and used for conversations across the partitioning member. Each of the devices includes optical communication means and magnetic adhesive means on the back of a housing and conversation means on the front of the housing, and also includes, inside the housing, a control unit that controls the optical communication means and the conversation means. The magnetic adhesive means is composed of paired magnetic generation means, and when the face-to-face call devices are placed in opposition, the magnetic generation means is arranged such that one of the paired magnetic generation means attracts the other magnetic generation means of the opposing face-to-face call device.SELECTED DRAWING: Figure 2

Description

The present invention relates to a large face-to-face communication device which is placed at opposite positions across a partition member and used when having a conversation across the partition member.

In recent years, as a countermeasure against the epidemic of new infectious diseases, there have been an increasing number of opportunities for face-to-face conversations to be conducted with transparent acrylic plates or transparent sheets in between. However, since there is a partition member between them, there is a problem that it becomes difficult to hear the conversation. To solve this problem, devices are provided that facilitate face-to-face communication.

For example, the face-to-face communication device disclosed in Patent Document 1 has a complicated structure because it has a microphone and a speaker separately from the main body, and the sound from the speaker is output to the outside through an acoustic tube.

International Publication WO2006/048920

However, the face-to-face communication device disclosed in Patent Document 1 is assumed to be used for communication between the room at the ticket office and the outside. The problem is that it is necessary.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a face-to-face communication device that requires no construction work, can be installed in any environment, and can be easily installed.

A face-to-face communication device of the present invention is a face-to-face communication device that is placed at positions facing each other with a partition member therebetween and used when having a conversation with the partition member therebetween. , a conversation means is provided on the front surface of the housing, and a control unit for controlling the optical communication means and the conversation means is provided inside the housing, the magnetic adhesion means is composed of a pair of magnetic generation means, and the face-to-face The magnetism generating means are arranged such that one of the paired magnetism generating means is attracted to the other magnetism generating means of the opposing face-to-face communication device when the communication devices are opposed to each other. It is a face-to-face communication device.

A face-to-face communication device placed at opposite positions across a partition member and used for conversation across the partition member, comprising an optical communication means and a magnetic adhesion means on the rear surface of the housing, and a conversation means on the front surface of the housing. and a control unit for controlling the optical communication means and the conversation means is provided inside the housing, and the magnetic adhesion means is composed of a pair of magnetic generation means, and when the face-to-face communication device is opposed to the , the magnetism generating means are arranged such that one of the paired magnetism generating means is attracted to the magnetism generating means of the other of the opposing two-way communication device, so that the magnetism generating means can be easily installed with the partition member sandwiched therebetween. You can create an environment where you can have a smooth conversation.

In the invention described in claim 2, the magnetism generating means is arranged so as to be horizontal or vertical when the two-way communication device is attached, and the magnetism generating means is positioned near the outer edge of the case of one of the magnetism generating means. 2. The face-to-face communication device according to claim 1, wherein the distance from the outer edge of the housing of the other magnetism generating means is equal to the distance of the magnetism generating means.

The magnetic field generating means are arranged so as to be horizontal or vertical when the two-way communication device is attached, and the distance from the near outer edge of the housing of one of the magnetic field generating means and the distance of the other magnetic field generating means Since the distance from the outer edge near the housing is the same, if the outer shape of the housing is aligned with the partition member between them, the magnets at the opposing positions will be attracted to each other and will be magnetically adhered, making installation easy. .

According to a third aspect of the present invention, the magnetism generating means has a plurality of magnets having magnetic poles with different polarities, and the magnets are each connected to the housing via a cushion material. 3. A face-to-face communication device according to claim 1 or claim 2.

Since the magnetism generating means has a plurality of magnets having magnetic poles with different polarities, and the magnets are each connected to the housing via the cushion material, the sound of the speaker is difficult to propagate through the housing and the partition member. Howling can be prevented.

In the invention described in claim 4, a noise microphone for collecting ambient noise is provided on the side or back of the housing, and the conversation means includes a conversation microphone for collecting conversation voice and a speaker for transmitting voice from the opposite device. 4. The noise signal from the noise microphone cancels out the ambient noise contained in the audio signal from the conversation microphone. face-to-face communication device.

A noise microphone that collects ambient noise is provided on the side or back of the housing, and the conversation means has a conversation microphone that collects conversational voice and a speaker that transmits the voice from the opposite device, and the voice from the conversational microphone. Since the ambient noise contained in the signal is canceled by the noise signal from the noise microphone, howling can be prevented.

The invention described in claim 5 is characterized in that the speaker and the noise microphone are acoustically fixed to the housing, and the conversation microphone is attached while being acoustically insulated from the housing. The face-to-face communication device described.

Since the speaker and the noise microphone are acoustically fixed to the housing, and the conversation microphone is mounted acoustically insulated from the housing, the sound from the speaker is transmitted to the housing and effectively directed to the speaker. Vocalization is performed. Further, since the noise microphone is acoustically fixed to the housing, the sound of the speaker of the opposing device can be effectively collected through the partition member.

The invention recited in claim 6 is the face-to-face communication device according to any one of claims 1 to 5, wherein the signal light emitted from the optical communication means is substantially parallel light.

Since the signal light sent out from the light sending section is substantially parallel light, stray light is reduced, less light goes around the light receiver of the device itself, and howling is less likely to occur.

According to the seventh aspect of the present invention, there is provided a face-to-face communication device according to the sixth aspect, wherein a light absorbing member is attached around a hole for a light receiver provided on the rear surface of the housing. be.

A light-absorbing member is attached around the hole for the receiver provided on the back of the housing, so stray light is reduced, less light enters the receiver of the device itself, and howling is less likely to occur.

The invention described in claim 8 is characterized in that a surface member is attached to the front surface of the housing, the surface member has an outer shape different from the outer shape of the housing, and is configured to be replaceable. Item 7. The face-to-face communication device according to any one of Item 7.

A surface member is attached to the front surface of the housing, and since the surface member has an outer shape different from that of the housing and is replaceable, it is possible to freely select an animal face or the like.

A ninth aspect of the present invention is characterized in that the control unit controls half-duplex communication based on an audio signal from the microphone of the conversation means and a light receiving signal from the light receiving portion of the optical communication means. The face-to-face communication device according to any one of claims 1 to 8.

Since the control section controls the half-duplex communication based on the voice output from the microphone of the conversation means and the received light signal output from the light receiver of the optical communication means, howling is less likely to occur.

In the invention described in claim 10, a plurality of human sensors are provided on the front surface of the housing, the directivity of the plurality of human sensors is directed toward the position of the speaker, and the output of the plurality of human sensors is provided. is input to the control unit to control half-duplex communication.

A plurality of motion sensors are provided on the front surface of the housing, the directivity of the plurality of motion sensors is directed toward the position of the speaker, and the outputs of the plurality of motion sensors are input to the control unit for half-duplex communication. is controlled, the person who generated the alarm can be identified, and malfunction prevention due to ambient sounds can be achieved.

According to the invention recited in claim 11, a predetermined filter is applied to audio signals from the conversation means and the optical communication means. It is a communication device.

A clear conversation environment can be provided because a predetermined filter is applied to the audio signals from the front earpiece section and the light receiving section.

(A) An explanatory view of the front face of the housing of the face-to-face communication device according to the present invention, and (B) an explanatory view of the rear face of the housing. It is explanatory drawing of the (A) volume (B) connector and switch of a face-to-face call device. It is an explanatory view of the back surface of the housing. It is explanatory drawing of the state of (A) vertical parallel, (B) horizontal parallel, (C) diagonal, and (D) deviation about the arrangement|sequence of a magnet. (A) Magnetism generation means, (B) It is explanatory drawing of arrangement|sequence of a magnet. (A) Magnetism generating means by combining a neodymium magnet and a magnetic material, (B) Magnetism generating means connected to the rear surface of a housing by a cushion material. FIG. 4 is an explanatory diagram of the arrangement of a light emitter and a light receiver; FIG. 4 is an explanatory diagram of a partition member and the interior of a housing in contact with the partition member; (A) Explanatory drawing of a magnet and a cushioning material, (B) It is the attachment explanatory drawing of a main board. It is a circuit block diagram. It is explanatory drawing of a human sensitive sensor. 4 is a flow chart of a control unit;

Face-to-face communication devices are required as countermeasures against the novel coronavirus in convenience stores, supermarket counters, ticket counters, hospital counters and sickrooms, banks, hotels, as well as visiting offices in nursing homes and nursing homes. In addition, there are many places such as clean rooms and confidential rooms where daily work requires conversation inside and outside the room. However, most of the conventional face-to-face communication devices consist of external microphones and speakers that are connected to the main unit by wire, and construction work is required for installation. Accordingly, the present invention solves the problem by providing a face-to-face communication device that can be installed with a partition member interposed therebetween.

In the face-to-face communication device according to the present invention, two face-to-face communication devices are set at opposite positions with a partition member interposed therebetween, so that the face-to-face communication devices are attracted to each other, so installation can be easily performed without construction work. In addition, since the face-to-face communication device is positioned in front of the user during conversation, it is desirable to have a familiar design.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The face-to-face communication device of the embodiment of the present invention shown in FIG. 1(A) is a state of the surface member 2 attached to the front surface of the housing located on the front surface of the housing. The design of this time adopts the design of a cat that has many lovers. Since the surface member is configured to be easily attached to the housing and is replaceable, the user can use his or her favorite design.

Holes 3 and 4 on the cat's face corresponding to the eyes in FIG. 1(A) serve as sound intake ports for conversation microphones for collecting conversation sounds. Also, the hole 5 in the part corresponding to the cat's mouth serves as an outlet for the sound transmitted from the speaker. A conversation microphone and a speaker arranged on the front of the housing are elements of conversation means.

FIG. 1B is an explanatory diagram of the back member. The back surface member is provided with holes 20, 21, 22, 23 for magnets in which neodymium magnets, which will be described later, are fitted, and holes 24, 25 for light reception and light transmission. The noise microphone hole 28 collects the sound from the speaker of the opposing device transmitted through the partition member and the ambient noise in the booth where the device is placed. The noise microphone 13 is preferably installed on the side or back of the housing, avoiding the front of the housing where conversational voices are likely to be picked up. The signal from the noise microphone becomes the noise signal and is used to cancel the noise picked up by the speech microphone.

FIG. 2(A) is provided with a dial 9 for volume adjustment used in a circuit to be described later. FIG. 2B shows the connector 7 for charging the battery 70 built into the housing and the switch 8 for power supply. The battery 70 is a rechargeable secondary battery, preferably a lithium ion battery.

A light absorbing member 26 is provided around the light receiving and light transmitting holes 24 and 25 on the rear surface of the housing shown in FIG. The light from the light-transmitting hole is almost collimated by a light shaping device or the like, but spreads while crossing the translucent partition member 40, is reflected on the back surface of the housing of the other device, and enters the light-receiving hole of the own device. sometimes enter. Therefore, an attempt is made to reduce the interference due to stray light by absorbing excess light with a light absorbing member. An optical optical communication means between facing face communication devices comprises a light emitter and a light receiver.

The arrangement of the magnets serving as the magnetism generating means will be described with reference to FIG. FIG. 4A shows an example in which a pair of magnets A, B and C, D are arranged in the vertical direction. When the two face-to-face communication devices are bent along the center line of the drawing, magnets A and D face each other, and magnets B and C face each other. Since magnets A and B and magnets C and D are arranged at the same position with respect to the near outer edge of the housing, it is possible to manufacture a face-to-face communication device with the same arrangement including the polarities of the magnets.

FIG. 4B shows an example in which a pair of magnets are arranged in the horizontal direction. When bent along the line in the center of the figure, one magnet A and the other magnet C face each other, and one magnet B and the other magnet D face each other. Since the magnets A, B and the magnets C, D are arranged at the same position with respect to the outer edge of the housing, it is possible to manufacture a face-to-face communication device with the same arrangement including the polarities of the magnets. When two face-to-face communication devices are arranged side by side, the arrangement of the magnets is line symmetrical.

FIG. 4(C) shows the case where the magnets are arranged at angles other than horizontal and vertical. Since it is not symmetrical about the central line, it is necessary to manufacture a two-way communication device in a paired arrangement.

FIG. 4D shows a case in which a pair of magnets are arranged in parallel in the vertical direction. Since this is also not axisymmetric, it is necessary to fabricate a two-way communication device in a paired arrangement.

FIG. 5A shows an arrangement example of the magnetism generating means (A1, A2, B1, B2). The magnetism generating means A1 and the magnetism generating means A2 are paired. The magnetism generating means B1 and the magnetism generating means B2 are paired. The distance LA1 from the outer edge of the housing of the magnetism generating means A1 is equal to the distance LA2 from the outer edge of the housing of the magnetism generating means A2. Also, the distance LB1 from the outer edge of the housing of the magnetism generating means B1 is equal to the distance LB2 from the outer edge of the housing of the magnetism generating means B2. By doing so, it is possible to obtain a magnetic adhesive force by facing two face-to-face communication devices having the same array of magnetism generating means.

FIG. 5B is an example of arrangement of magnets included in the magnetism generating means. In FIG. 5B, the arrangement of the corresponding magnets is such that the magnetic poles of A1 are N from the top in FIG. , S, N, and the magnetic poles are S, N, S at A2.

As shown in FIG. 6A, when two magnetic adhesive means are opposed to each other with a partition member 40 interposed therebetween, magnetic lines of force flow as indicated by arrows, and a strong magnetic adhesive force can be obtained. The magnetic adhesion means for mutually attracting the partition member between them can be composed of a ferrite magnet or a neodymium magnet. In the case of ferrite magnets, magnetized magnets are used so that S and N poles are generated at the ends of the magnet in the longitudinal direction. When button type neodymium magnets 30, 31, 32, 33 are used, it is desirable to connect the backs of the two neodymium magnets with magnetic bodies 35, 36. FIG.

FIG. 6B shows magnets 30, 31, 32, and 33 connected to the rear surface 18 of the housing with a cushion material 37 interposed therebetween. In this case, the magnetic lines of force flow from the N pole to the S pole across the partition member 40 to generate a magnetic adhesive force. The cushion material 37 may be of any material as long as it has a function of preventing the sound from the speaker of the opposing device from being transmitted to the housing of the own device via the partition plate. A spongy member containing air bubbles is suitable.

A cushion material is provided between the housing and the partition member, and the damping amount when the vibration from the speaker of the housing is transmitted to the other side through the partition member is measured by changing the intermediate material used as the cushion material. are shown in Table 1.

In the experiment, various cushion materials were sandwiched between the housing of the face-to-face communication device and the partition member, and the speaker of the face-to-face communication device was driven at frequencies of 500 Hz and 1000 Hz. Sound pressure was measured. The sound pressure difference between the sound pressure from the speaker and the sound pressure at the opposing position across the partition member is the amount of attenuation by the cushion material and the partition member.

In Table 1, "without intermediate material" indicates the attenuation amount of only the partition member. Glass has the highest attenuation (30 dB, 35 dB), followed by acrylic plate (28 dB to 31 dB), and 1 mm film has 11 dB of attenuation. Attenuation of 10 dB is one tenth of the sound pressure power, so the presence of the film makes it difficult to hear the other party's voice.

If the difference between various intermediate materials and none is the attenuation due to the intermediate materials, sound absorbing sponges, urethane sponges, and air caps are promising as intermediate materials. All of them contain air bubbles, and it can be seen that there is little transmission of sound by solids. Sound-absorbing sponges are considered to have high sound-insulating properties because the solid part converts sound energy into heat and absorbs sound.

In order to reduce the propagation of sound, the cushioning material with the magnet attached to its tip should preferably have a small cross-sectional area and at the same time should have rigidity to support the face-to-face conversation device dynamically.

The correspondence relationship between the light emitter 50 and the light receiver 60 will be described with reference to FIG. Since the light from the LED or LD, which is the light emitter 50, is diffused light, it is converted into substantially parallel light using an optical system such as a lens. Further, since the divergence angle becomes smaller as the aperture becomes larger, a simple light shaping device 51 such as a cylinder may be used. A light absorbing member 54 is applied or attached around the holes for the light emitter and the light receiver to prevent stray light from entering the partition member. In addition to the magnetic adhesive force, it is also preferable to apply or affix an anti-slip member 55 to the rear surface of the housing so that the face-to-face communication device does not slide down from the partition member.

The sound collecting microphone 13 shown in FIG. 8 is fixed to the fixed substrate 12, and the fixed substrate 12 is acoustically fixed to the housing 19. As a result, the sound from the opposing device transmitted from the partition member 40 and the noise in the booth where the device is placed, transmitted through the housing of the device itself, are efficiently collected by the noise microphone.

By surrounding the speaker 6 with the speaker box 66, the sound from the speaker can be efficiently transmitted into the booth where the device is placed. The sound from the opposing device transmitted through the partition member 40 is blocked by the cushion material 37 from being transmitted to the housing of the own device. It is also preferable to attach a megaphone-like member to the front of the housing for efficiently transmitting the speaker's voice to the person speaking.

FIG. 9(A) shows button magnets 30, 31, 32, and 33 fixed to the rear surface of the housing via a cushion material 37. As shown in FIG. A hole for a noise microphone is provided on the rear surface of the housing, and a noise microphone 13 collects ambient noise from outside the housing.

FIG. 9B shows how the main board for fixing the conversation microphone is acoustically fixed to the housing. When the main board 11 is fixed to the housing with the bolt 15, a cushion washer 14 is sandwiched between the bolt 15 and the main board 11 to prevent transmission of vibration from the housing to the conversation microphone via the bolt.

FIG. 10 shows a block diagram of a transmission section, a reception section, and a control section for controlling them. The transmitter subtracts the signal of the conversational microphone by the signal of the noise microphone 13 and filters the voice signal from the conversational microphone after amplification. Limit your vocal range. The audio signal from the filter is sent to the LED drive circuit to light the LED, which is a light emitter. An FET switch for controlling ON/OFF of the LED is connected in series to the LED drive circuit, and is turned ON/OFF by a control circuit to be described later. The audio signal from the filter is converted into a digital signal by an analog-to-digital converter (ADC) and sent to the controller. This ADC may be built in a microcomputer that constitutes the control section. The filter band is selected from 150HZ to 1.5KHZ to emphasize the components necessary for conversation.

A signal light from the opposite face-to-face communication device is converted into an audio signal by a phototransistor (PT), which is a light receiver constituting a receiver. This audio signal is amplified by an amplifier, limited in frequency band by a filter, and sent to a power amplifier (PA) through a volume control. This audio signal is simultaneously converted into a digital signal by an analog-to-digital converter (ADC) and sent to the control section.

The volume of the voice signal from the conversation microphone is used to control half-duplex communication, but there is a risk of malfunction if there is a loud voice nearby. A proximity sensor was prepared in case such countermeasures were necessary. FIG. 11 shows a human sensor having multiple proximity sensors 801 and 802 and directors 811 and 812 . Proximity sensors may be of any type, such as infrared rays, ultrasonic waves, and radio waves, but infrared sensors are preferred. Since the sensor alone has a wide detection range, directors 811 and 812 are attached to the sensor to narrow down the target area. By setting the area where the detection ranges of the directors 811 and 812 overlap with the position of the speaker of the device itself, it is possible to detect the presence or absence of the speaker based on the presence or absence of outputs from both contact sensors 801 and 802. .

FIG. 12A shows the control flow of the control section that controls the receiving section. S0: When the power switch 8 is turned on, the reset state is entered and the LED is turned off. S1: When the audio signal (PT signal) from the received light signal is equal to or greater than the predetermined threshold value Th1 (Y), the audio has arrived from the partner device. When the voice signal (PT signal) is below the predetermined threshold Th1 (N), the process proceeds to the transmission section. S2: When the level of the audio signal from the microphone of the device itself is equal to or lower than a predetermined threshold value Th2, it is determined that there is no microphone input from the device itself (Y). If the level of the audio signal from the microphone of the device itself exceeds a predetermined threshold value Th2 (N), the device shifts to the transmission section. S3: If the conditions of S1 and S2 are satisfied (Y), the speaker is driven by the power amplifier and voice is produced from the partner device.

FIG. 12B shows the control flow of the control section that controls the transmission section. If the conditions are not met in the control flow of the receiving section shown in FIG. 12A, the control shifts to the transmitting section. In FIG. 12B, it is determined whether or not the speaker exists. S4: It is determined whether or not the signal from the proximity sensor 801 exceeds a predetermined magnitude Th3. If not, it is determined that the speaker is absent and the process returns to S1. S5: It is determined whether or not the signal from the proximity sensor 802 exceeds a predetermined magnitude Th4. If not, it is determined that the speaker is absent and the process returns to S1. If Th4 is exceeded, there is a talker, so the process proceeds to S6 in FIG. 12(C).

In FIG. 12C, the magnitude of the audio signal of the device itself and the optical signal from the partner device are checked. S6: If the optical signal from the partner device is equal to or less than the predetermined threshold value Th1 (Y), the process proceeds to S7. When the optical signal from the partner device exceeds the predetermined threshold value Th1 (N), the process shifts to control S1 of the receiving unit.

S7: When the voice signal from the conversation microphone exceeds the threshold Th2 (Y), the process proceeds to S8, and S8: Transmits signal light from the LED, which is a light emitter. When the audio signal MV from the microphone is equal to or smaller than the threshold Th2 (N), the process proceeds to S1 of the receiving unit.

By using the face-to-face communication device of the present invention, it is possible to facilitate conversation in a place where a partition member is sandwiched between them.

2 surface members 3, 4 hole for conversation microphone
5 speaker hole 6 speaker 7 charging connector 8 power switch 9 volume dial 10 two-way communication device 11 main board 12 fixed board 13 noise microphone 14 cushion washer 15 bolt 17 housing front 18 housing back 20 , 21 , 22 , 23 Magnet holes 24, 25 Optical communication hole 26 Light absorption member 28 Noise microphone holes 30, 31, 32, 33 Neodymium magnets 35, 36 Magnetic body 37 Cushion material 40 Partition member 41 N-type magnet 42 S-type magnet 50 Light emission device (LED)
51 Light shaper 52, 53 Housing back surface 55 Non-slip member 60 Light receiver 70 Battery 801, 802 Proximity sensor 811, 812 Director 85 Target area

Claims (11)

A face-to-face communication device placed at opposing positions across a partition member and used when having a conversation across the partition member,
An optical communication means and a magnetic adhesion means are provided on the rear surface of the housing, a conversation means is provided on the front surface of the housing, and a control unit for controlling the optical communication means and the conversation means is provided inside the housing,
The magnetic adhesion means is composed of a pair of magnetism generation means, and when the two-way communication devices are opposed to each other, one of the paired magnetic generation means faces the other of the two-way communication devices. A face-to-face communication device, wherein the magnetism generating means is arranged so as to be attracted to the magnetism generating means. The magnetic field generating means are arranged so as to be horizontal or vertical when the two-way communication device is attached, and the distance from the near outer edge of the housing of one of the magnetic field generating means and the distance of the other magnetic field generating means 2. The face-to-face communication device according to claim 1, wherein the device is placed at a position equal to the distance from the outer edge of the housing. 3. The face-to-face call according to claim 1, wherein said magnetism generating means has a plurality of magnets having magnetic poles with different polarities, and said magnets are each connected to said housing via a cushion material. Device. A noise microphone that collects ambient noise is provided on the side or back of the housing, and the conversation means has a conversation microphone that collects conversational voice and a speaker that transmits the voice from the opposite device, and the voice from the conversational microphone. 4. The face-to-face communication device according to claim 1, wherein the ambient noise contained in the signal is canceled by a noise signal from the noise microphone. 5. The face-to-face communication device according to claim 4, wherein said speaker and said noise microphone are acoustically fixed to a housing, and said conversation microphone is mounted acoustically insulated from said housing. 6. The face-to-face communication device according to claim 1, wherein the signal light transmitted from said optical communication means is substantially parallel light. 7. A two-way communication device according to claim 6, wherein a light absorbing member is attached around a hole for a light receiver provided on the rear surface of said housing. 8. The face-to-face call according to any one of claims 1 to 7, wherein the surface member is attached to the front surface of the housing, the surface member has an outer shape different from the outer shape of the housing, and is configured to be replaceable. Device. 9. A method according to any one of claims 1 to 8, wherein said control unit controls half-duplex communication based on an audio signal from a microphone of said conversation means and a received light signal from a light receiver of said optical communication means. face-to-face communication device. A plurality of motion sensors are provided on the front surface of the housing, the directivity of the plurality of motion sensors is directed toward the position of the speaker, and the outputs of the plurality of motion sensors are input to the control unit for half duplex. 10. The face-to-face communication device according to claim 1, wherein the communication is controlled. 11. The face-to-face communication device according to any one of claims 1 to 10, wherein audio signals from said conversation means and said optical communication means are filtered by a predetermined filter.

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