JP4179575B2 - Face-to-face communication device and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a face-to-face call device for smoothly performing a face-to-face call through a wall that partitions the inside and outside of a room as seen in a ticket office such as a railway, a ticket office such as a ticket, or an interview system, and the like Regarding the method.
[0002]
[Prior art]
A conventional general face-to-face communication device will be described using the conventional example of FIG.
Hereinafter, an example of a ticket office will be described from among the face-to-face communication devices.
[0003]
In general, in a ticket office, a seller 103 who sells a ticket in a room has a conversation with a buyer 104 who comes to purchase a ticket, such as “request a ticket” or “provide a ticket and receive money”. It is designed to sell tickets that are smooth and error free.
[0004]
In the ticket vending section, a transparent partition plate 108 is generally installed between the seller 103 and the purchaser 104 so that both can talk while checking their faces. Sound holes are provided in the transparent partition plate, but the sound hole opening rate is about 10-15%, so in the conversation between the seller 103 and the purchaser 104, when the sound volume is not heard well, In some cases, it may not be possible to sufficiently communicate with an elderly person who is far away from the ear, and it is necessary to electrically amplify each other's call.
[0005]
In the conversation with each other, the voice of the seller 103 is picked up by the transmission microphone 106 and amplified by the face-to-face loudspeaker 105 and transmitted to the purchaser 104 through the outdoor speaker 110, and the voice of the purchaser 104 is picked up by the reception microphone 107. Amplified by the face-to-face loudspeaker 105, output from the indoor speaker 109 and transmitted to the seller 103 for communication.
[0006]
However, the above-described face-to-face communication device has a drawback that the purchaser 104 does not pay attention to the position of the microphone because the buyer 104 looks at the face of the seller 103 and does not pay attention to the position of the microphone.
Further, when the loudspeaker speaker of the seller 103 is an outdoor speaker 110 installed at a position different from that predicted by the purchaser or a speaker integrated with the receiver microphone 107, the purchase is performed. Since the voice comes from a place different from the place predicted by the person 104, the person who visits for the first time is particularly confused, and the conversation for purchasing the ticket cannot be carried out smoothly.
[0007]
[Problems to be solved by the invention]
The present invention was devised in view of the current state of the prior art, and its purpose is to provide a system that enables smooth conversation at a ticket office and the like, and can be easily achieved. A partition plate with a sound hole on the front so that a buyer can make a two-way call using the loudspeaker as if the buyer had a conversation looking at the seller's face even when using the loudspeaker And a method for in-person communication where the receiver's voice is output and the receiver microphone is positioned where the purchaser is approaching the seller's face, so that there is no error in both communication and work Is to provide.
[0008]
[Means for Solving the Problems]
As a result of earnestly studying a face-to-face communication device and method capable of performing communication and work smoothly and easily in order to achieve such an object, the present inventor has provided a transparent space on the wall separating the inside and the outside of the room, Furthermore, the present inventors have found that a face-to-face call can be smoothly performed by installing a speaker and outputting sound through the space, thereby completing the present invention.
[0009]
That is, the present invention provides a face-to-face communication device that performs face-to-face communication through a wall that partitions the inside and outside of a room, and provides a space configured by a transparent plate that has a sound hole on the wall and a transparent plate that blocks sound, A face-to-face communication device characterized in that a speaker is installed in the space, or an acoustic duct is installed in the space, and a speaker is installed in the acoustic duct.
[0010]
In addition, the present invention provides a face-to-face call method in which a space configured by a transparent plate provided with a sound hole and a transparent plate that blocks sound is provided in a wall that partitions the inside and outside of a room, and a face-to-face call is made through the space. The person outside the room talks by inputting sound into the microphone in or near the space and outputting it to the speaker inside the room, and the person inside the room sends the sound to the microphone inside the room. It is a face-to-face call method characterized in that a call is made by inputting and outputting it to a speaker in the space or a place communicating with the space, and further to the outside of the room through the sound hole.
[0011]
When selling tickets at a place where the inside and outside of the room are partitioned, if the communication between the seller and the purchaser is not properly made, mistakes such as selling wrong tickets may occur, and the service is degraded. Will cause complaints and a decrease in customers. For this reason, the present invention creates a state in which the conversation between the seller and the purchaser is conducted through the amplifying device, even if there is a transparent partition plate, and both parties face each other and have a natural conversation. A face-to-face communication apparatus and method are proposed.
[0012]
An example of the face-to-face communication apparatus of the present invention will be described with reference to the example of the present invention of FIG. 2, the face-to-face enlarged view of FIG. 3 in which the face-to-face window portion of FIG. 2 is enlarged, and the face-to-face enlarged view of FIG. .
[0013]
The point of the present invention is that when the seller 203 and the purchaser 204 interact, the purchaser 204 feels that the voice of the seller 203 can be heard from the sound hole partition plate 303 (405) of the facing window 208. When the purchaser 204 speaks toward the sound hole partition plate 303 (405) of the facing window 208, the purchaser 204 can clearly hear the room speaker 210 where the seller 203 is present at an appropriate volume.
[0014]
The transparent partition plate 302 (402) on the indoor side of the facing window 208 has a structure that acoustically shields the indoor 201 and the outdoor 202, and the transparent plate installed on the outdoor side is a partition plate 303 (405) with a sound hole. The space 307 (409) is formed between the transparent partition plate 302 (402) and acoustically communicating with the outdoor 202 through the sound hole 314 (410).
[0015]
The voice of the seller 203 is picked up by the transmission microphone 206 and amplified by the bidirectional loudspeaker 205, and the voice of the seller 203 is output by the outdoor speaker 308 installed in the space 307 as shown in FIG. The sound is output as sound 311 from the sound hole 314 of the partition plate 303 with sound hole toward the purchaser 204.
[0016]
As another method, as shown in FIG. 4, an outdoor speaker 403 is installed in the vicinity of the facing window, and an acoustic duct 404 communicating with the space 409 from the outdoor speaker 403 is installed. It can also be configured to be output as sound 412 from the sound hole 410 to the purchaser 204 outside the room 413.
[0017]
Next, the installation method of the reception microphone 304 (407) and the noise detection microphone 305 (406) to be installed on the partition plate 303 (405) with a sound hole will be described in enlarged views of the facing windows of FIGS. 3 and 4 and the installation example of the reception microphone of FIG. Will be described.
[0018]
Many people walk around the ticket office and the noise level is often high due to automobiles, air conditioning, cheering children, etc. from outside, so the voice of the purchaser 204 may be masked by those noises. Therefore, in the present invention, in order to prevent this, the receiving microphone 304 (407) and the noise detection microphone 305 (406) are installed around the facing window 208 as shown in FIGS. It is configured to reverse the phase and cancel the noise. With such a configuration, since the voice of the purchaser 204 input from the receiving microphone 304 (407) remains in a state in which noise is canceled, clear voice is output to the seller 203 in the room 312 even under noise. be able to.
[0019]
The receiving microphone 304 (407) installed in the sound hole partition plate 303 (405) is the position where the purchaser 204 is most likely to approach the sound hole partition plate 303 (405) and the position where the mouth which is the sound source of the purchaser 204 approaches. It is preferable to install in For example, the receiving microphones 304 (407) and 504 are installed in a part of the sound holes 505 of the sound hole partition plate 506 as in the receiving microphone installation example of FIG.
[0020]
On the other hand, the voice of the seller 203 is output as the voice 311 passing through the sound hole 314 of the partition plate 303 with sound holes from the outdoor speaker 308 through the space 307 as shown in FIG. 3, or as the outdoor speaker as shown in FIG. 403 is output as sound 412 that passes through the sound hole 410 of the sound hole partitioning plate 405 through the acoustic duct 404 and the space 409, so that the receiving microphones 304 (407) and 504 receive sound from the back space 307 (409). It is preferable that the microphone has a directivity so as not to input as much as possible so that howling is less likely to occur.
[0021]
In order to operate the above system, for example, a configuration according to the bidirectional loudspeaker diagram of FIG. 6 is adopted. That is, the transmission microphone 601 is connected to the amplification 602 to an appropriate level, connected to the amplification 604 via the ATT 603 for suppressing howling, etc., connected to the amplification 606 via the ATT 605 having an appropriate output level, and the output amplification 607. Is connected to a change-over switch 608 that switches between the outdoor speaker 609 and the transmitting speaker 610 at the window, so that the output can be selected by the change-over switch.
[0022]
In addition, a reception microphone 611 and a noise control microphone 623 that receive the voice of the purchaser are installed in a facing window 624, for example, and the phase of the noise control microphone 623 is controlled by the phase control 612, and the noise of the noise control microphone 623 and the reception microphone 611 is reduced. The input is input to the noise control 613 to be controlled, the output is connected to the amplifier 614, and the signal is input to the amplifier 617 via the ATT 615 which makes the signal from the voice detection 622 an appropriate level.
[0023]
Further, the level from the receiving microphone 611 is detected by the voice detection 616, and the outputs of the amplification 617 and the amplification 602 are controlled by the ATT 618 and the ATT 603, respectively, and the signal from the ATT 618 is amplified to an appropriate level by the amplification 619 and the output 620. The indoor speaker 621 is driven.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the face-to-face communication apparatus and method of the present invention will be specifically described by taking ticket sales as an example, but the present invention is not limited to this.
[0025]
In the apparatus of the present invention, as shown in FIG. 2, a facing window 208 where a seller 203 in a room 201 faces a purchaser 204 in an outdoor room 202 is composed of a transparent partition plate 302 and a partition plate 303 with a sound hole. It is configured to create a space. When the purchaser 204 approaches the ticket counter, it can be confirmed from the face-to-face window 208, and the proximity sensor 214 (627) detects that the purchaser has come to the ticket counter with human body temperature, sound, radar system, pressure switch, or the like. can do. This detection signal is amplified by the amplifier 628, and the output of the amplifier 614 is allowed to pass with the ATT 629 of the volume attenuation device opened. When the proximity sensor 214 (627) operates, when the purchaser 204 comes in front of the counter 215, the two-way loudspeaker 205 prepares for both conversations using the loudspeaker.
[0026]
For example, when the seller 203 in the room 201 utters a question confirming the destination station, a voice is input to the transmission microphone 206 (601). The voice of the seller 203 input to the transmission microphone 601 is amplified to an appropriate level of about -20 dB by the amplification 602 and input to the amplification 604 of the next stage. The ATT 603 is between the amplification 602 and the amplification 604. Have a device.
[0027]
The ATT 603 increases the sensitivity of the receiving microphone 611 when the seller 203 increases the volume when the voice of the purchaser 204 cannot be heard or when the automatic volume adjustment in the amplifying device 614 operates, and the transmitting speaker increases. In order to prevent howling caused by picking up the sound of 610 and howling that occurs when the volume of the receiving microphone increases, the apparatus is controlled for the purpose of controlling the volume of the transmitting microphone 601.
[0028]
The output of the amplification 604 is input to the amplification 606 via the ATT 605. The ATT 605 in between the amplification 604 and the amplification 606 is provided as a device for adjusting in real time whether or not the output in the facing window is appropriate. The level of the transmitting microphone 601 is output from the output amplifier 607 to the facing window 624 by the transmitting speaker 610 and further transmitted to the purchaser. The receiving microphone 611 is in the facing window, and the receiving microphone 611 is the transmitting microphone. 601 is picked up and output from the indoor speaker 621, and the allowable value of the output that does not cause howling in the acoustic loop input to the transmitting microphone 601 is detected in real time by the voice detection 616, and in the facing window If there is a surplus in the howling level at the time, the ATT 603 adjusts the attenuation amount by the voice detection 616, and the volume level in the window is checked in real time by the voice detection 622 by the receiving microphone 611, and output from the face-to-face window 624 To work properly.
[0029]
The amplifier 606 is configured to output to the output speaker 610 and the output amplifier 607 that performs power amplification necessary to drive the outdoor speaker 609. The output amplifier 607 is either the transmitter speaker 610 or the outdoor speaker 609. Is output to any one of the changeover switches 608 for operating the. The outdoor speaker 609 is used when general guidance as a station is given to a plurality of purchasers outside the room or when a ticket purchaser misunderstands and leaves the window.
[0030]
In the enlarged view of the facing window in FIG. 3, the outdoor speaker 308 is installed on the upper surface of the facing window and is output toward the facing window. Actually, the sound from the outdoor speaker 308 is output to the space 307 between the transparent partition plate 302 and the sound hole partition plate 303, and the output sound is output from the plurality of sound holes 314 of the sound hole partition plate 303. , And output to the purchaser 204 in front of the facing window 208. The sound from the sound hole 314 generated by such an arrangement of the outdoor speaker 308 makes an illusion that the purchaser 204 can directly hear the sound from the seller 203 that is visible in the front. As a result, when the voice of the salesperson 203 is heard from the facing window 208, the purchaser 204 brings his face closer to the facing window 208.
[0031]
The voice of the purchaser 204 is input to the receiving microphone 207 installed in front of the facing window 208, amplified to a level of about −20 dB by the amplification 614, and passed to the amplification 617. An ATT 629 and an ATT 615 are provided between the amplifier 614 and the amplifier 617. The ATT 629 gives a large attenuation so that the signal of the receiving microphone 611 is not input to the amplifier 617 until the purchaser comes close to the face-to-face communication device. When the proximity sensor 627 detects the approach of the purchaser 204, the attenuation of the ATT 629 is canceled to a set level, and the signal of the amplification 614 is passed at an appropriate level.
[0032]
The voice detection 616 detects the level of the receiving microphone 611 and adjusts the level of the receiving microphone 611 by the ATT 618. The ATT 603 detects the voice so that the optimum output of the transmitting speaker 610 according to the level of the receiving microphone 611 is obtained. 616 operates. The ATT 618 causes an appropriate output level of the indoor speaker 621 through the amplification 619 and the output 620.
[0033]
The above face-to-face communication device will be described with reference to the system flow of FIG.
When the purchaser approaches the window (702), the proximity sensor detects and the sound of the receiving microphone installed in the facing window is output to the room (703), and the salesperson in the room knows that the purchaser has come. Can do. Alternatively, the ticket salesperson in the room can also know by a display device that notifies the purchaser when the purchaser approaches the proximity sensor.
The seller who recognizes the approach of the purchaser by voice or display responds from the transmitting microphone when the voice is emitted, and the seller's voice is output to the space in the facing window (704) and purchased from the sound hole of the partition plate. The purchaser feels as if it was heard from the salesperson (705), and when the purchaser conveys the message to the facing window, the voice of the purchaser is heard from the speaker in the room (706).
[0034]
The structure of the facing window of the apparatus of the present invention will be described with reference to the enlarged views of FIGS. 3 and 4. The facing window has a size and transparency so that each face can be seen, and the indoor 312 (411) side and the outdoor 313 (413). ) Sides are each provided with a partition plate. The partition plate on the indoor window 312 (411) side of the facing window has a structure that is transparent and has no sound holes or the like. For example, a transparent plate-like material such as glass or an acrylic plate is used as a sound insulating structure. The On the other hand, the partition plate on the outdoor 313 (413) side is transparent and has a structure provided with a plurality of sound holes 314 (410). For example, a transparent plate-like material such as glass or an acrylic plate is used to pass sound. As a structure to do.
[0035]
Specifically, as shown in FIG. 3, a speaker 308 is installed in a space 307 formed by the transparent partition plate 302 on the indoor (312) side and the partition plate 303 with sound holes on the outdoor (313) side. The sound 311 is output to the outdoor 313 side from the sound hole 314 installed in the partition plate 303 with sound holes, or the speaker 403 is part of the wall leading to the space 409 or the facing window as shown in FIG. The sound is output from the speaker 403, the sound is output through the acoustic duct 404 to the space 409 configured by the transparent partition plate 402 and the sound hole-equipped partition plate 405, and then from the sound hole 410 to the outdoor 413. The voice is output to the side.
[0036]
The above two methods are different depending on whether the sound is directly output to the space 307 or the sound is output via an acoustic duct leading to the space 409, and is appropriately selected depending on the wall structure, the wall thickness, and the like. It is preferable. With either method, the purchaser's voice tends to come closer to the face-to-face window because the salesperson 203's voice is clearly heard through the transparent plate, resulting in communication and work. This has the effect of leading to speed, and is the most characteristic feature of the present invention.
[0037]
Next, an apparatus for suppressing external noise input to the purchaser's microphone in the apparatus of the present invention will be described. In places where tickets are sold, such as stations, a large number of people are walking, and there are various noises such as loud voices of children, sounds of hitting objects, and sounds of dragging. In such a noise state, when the voice of the purchaser 204 is low, the sound level can be increased by the sound detection 616. However, even if the sound volume is increased, external noise also increases at the same time, so the clarity may not be improved. .
[0038]
In the present invention, in order to deal with such a case, the receiving microphone 207 and the noise detection microphone 213 are installed in the facing window to reduce the noise. In this case, the reception microphone 207 (611) and the noise detection microphone 213 are installed at positions close to each other, but the voice of the purchaser 204 is configured to be input to the reception microphone 207 (611), and the noise control microphone 623 is the purchaser. It is preferable to install the device at a position where it is difficult for the voice 204 to enter. With such an arrangement, when there is no sound, the outdoor 202 noise is input to both the microphones as noise. That is, with reference to the noise control explanatory diagram of FIG. 8, the noise waveform 802 is input to the reception microphone 611, and the noise waveform 804 is input to the noise detection microphone 623, and the waveform is the noise control microphone 623 and the reception microphone 611. Same waveform. It can be considered that both microphones are almost in the same position considering the distance from the noise source.
[0039]
In FIG. 6, when the phase control 612 is provided in the system of the noise control microphone 623 and the phases are reversed and mixed, the noise waveform input to the reception microphone 611 that is not changed in phase at the same level. Then, the noise waveform input to the noise control microphone 623 cancels out, and the voice waveform of the purchaser input to the reception microphone 611 is output from the noise control 613. With the configuration described above, since outdoor noise can be canceled and only the voice of the purchaser 204 can be clearly transmitted to the seller 203 in the room 201, smooth sales without mistakes are possible.
[0040]
Next, the proximity sensor installed in the apparatus of the present invention will be described.
Since the purchaser 204 comes continuously in the daytime to sell the ticket at a station or the like, the seller 203 also responds as a continuous job. Since it is useless to keep 203 at all times, it becomes a concurrent job with other work, but when the buyer comes, when the purchaser comes, Sensors with functions such as sound, radar system, and pressure switch are installed outside as outdoor proximity sensors. The proximity sensor output is configured so that a signal change such as an ON-OFF signal or the like is lit by an amplifier 628 or a signal sound is generated. As a result, the seller 203 can easily know that the purchaser has come without having to always be in front of the facing window.
[0041]
However, with the method of notifying the seller 203 that the purchaser has come by using only the proximity switch, the seller who has done another job comes to the face-to-face window due to a malfunction caused by a small child approaching or placing a baggage. It may be necessary. Therefore, in order to improve the reliability of the system, it is preferable to use the voice information of the purchaser 204 to the receiving microphone in addition to the proximity information of the purchaser 204 by the proximity sensor 627. For example, when the purchaser 204 makes a voice calling the seller 203, the sound level of the noise control 613 is converted to a 1-0 signal and input to the amplifier 628, and an AND operation is performed with the 1-0 signal of the proximity sensor signal. When both inputs are in the input state, the ATT 629 is set to zero attenuation, or the display 630 notifying that the purchaser has come is operated.
[0042]
In the apparatus of the present invention, as described above, the sound of the outdoor speaker 308 (403) is output to the space 307 (409) and the sound holes 314 (410) installed in the sound hole partition plate 303 (405). However, when the receiving microphone 304 (407) is installed in a part of the sound hole 314 (410) of the partition plate 303 (405) with a sound hole, the receiving microphone is used. It is most appropriate that 304 (407) is installed near the center of the partition plate 501 with the sound hole in consideration of the position where the purchaser 204 speaks while listening to the sound from the sound hole 314 (410).
[0043]
The receiving microphone is attached to the partition plate with a design adapted to the shape of the sound hole as shown in FIG. 5, so that the purchaser's mouth tends to approach the partition plate without being aware of the microphone. What is characteristic here is that the smaller the sound output to the back space, the closer the purchaser 204 gets closer to the sound hole partition plate 501 and the closer to the receiving microphone 504. The voice of the purchaser can be heard more clearly.
[0044]
Furthermore, by making the receiving microphone 504 installed on the partition plate with sound holes 501 a directional microphone facing the purchaser side, it is possible to suppress the sound output to the back space from being input to the receiving microphone 504, Earn a howling margin. However, although a howling margin can be obtained by using a directional microphone for the receiving microphone 611, the acoustic engineering has the same structure as that in which a microphone is installed in front of a speaker for audio output. The state of the amplification 614 line is controlled in accordance with the volume of the microphone with ATT 618 so that the voice detection 616 watches in real time and the output of the indoor speaker 621 does not overload the transmitting microphone 601 and howling, and the output of the indoor speaker is constant. It is preferable to configure so that.
[0045]
【The invention's effect】
Since the face-to-face communication apparatus and method of the present invention have the above-described configuration, the following effects can be obtained.
(I) In a two-way face-to-face communication system in which a room is separated from the outside, such as station ticket sales and cinema ticket sales, communication and work can be performed quickly without causing misunderstandings. In particular, since the purchaser listens to the voice of the seller from the face-to-face window, the purchaser tends to communicate with the face close to the face-to-face window, and a smooth and natural dialogue is possible.
(Ii) The seller can clearly hear only the voice of the purchaser by the device that suppresses external noise input to the purchaser's microphone.
(iii) With the proximity sensor that informs the purchaser that the purchaser has come, it is sufficient for the seller to come to the face-to-face window and respond to it only when necessary. Further, by using the purchaser's voice information to the receiving microphone in addition to the proximity sensor, the purchaser's visit sensing accuracy is further improved.
(Iv) Since indoors and outdoors are separated by a transparent facing window, indoor persons are not directly harmed from outside.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a conventional example of ticket sales at a station.
FIG. 2 is an explanatory diagram of the present invention in ticket sales at a station.
FIG. 3 is a cross-sectional view of a facing window for explaining an example of the structure of the facing window.
FIG. 4 is a cross-sectional view of a facing window for explaining an example of the structure of the facing window.
FIG. 5 shows an installation example of a receiving microphone installed on a partition plate with a sound hole.
FIG. 6 is a bidirectional loudspeaker system diagram of the apparatus of the present invention.
FIG. 7 is a system flow of the operation method of the present invention.
FIG. 8 is an explanatory diagram of noise control of the apparatus of the present invention.
[Explanation of symbols]
101 room
102 outdoor
103 seller
104 Buyer
105 Face-to-face loudspeaker
106 Mic
107 microphone
108 Transparent partition plate
109 Indoor speaker
110 Outdoor speaker
111 outdoor noise
201 room
202 Outdoor
203 Seller
204 Purchaser
205 Two-way loudspeaker
206 Speaking microphone
207 microphone
208 face-to-face window
209 wall
210 Indoor speakers
211 Outdoor speaker
212 Delivery hole
213 Noise detection microphone
214 Proximity sensor
215 counter
301 wall
302 Transparent partition plate
303 Partition with sound hole
304 microphone
305 Noise detection microphone
306 Delivery hole
307 space
308 Outdoor speaker
310 Indoor Speaker
311 voice
312 room
313 outdoor
314 sound hole
401 wall
402 Transparent partition plate
403 outdoor speaker
404 acoustic duct
405 Partition plate with sound hole
406 Noise detection microphone
407 microphone
408 Delivery hole
409 space
410 sound hole
411 room
412 voice
413 outdoor
501 Partition with sound hole
502 microphone
503 Enlarged view
504 Telephone microphone
505 sound hole
506 Partition plate with sound hole
601 Sending microphone
602 amplification
603 ATT
604 amplification
605 ATT
606 amplification
607 Output amplification
608 selector switch
609 Outdoor speaker
610 Speaker
611 microphone
612 Phase control
613 Noise control
614 amplification
615 ATT
616 Voice detection
617 amplification
618 ATT
619 Amplification
620 output
621 Indoor speaker
622 Voice detection
623 Noise control microphone
624 face-to-face window
625 outdoor
626 room
627 Proximity sensor
628 amplification
629 ATT
630 displays
701-706 system flow
801 Receive microphone signal
802 Noise waveform
803 Purchaser voice waveform
804 Noise waveform
805 Noise detection microphone signal
806 Purchaser voice waveform
807 Composite waveform

Claims (10)

  In a face-to-face communication device that performs a face-to-face call through a wall that partitions the inside and outside of a room, a space is provided on the wall that is configured by a transparent plate that has a sound hole and a transparent plate that blocks sound, and a speaker is provided in the space. A two-way call characterized in that an acoustic duct is installed in the space, a speaker is installed in the acoustic duct, and a microphone that inputs sound outside the room is installed in or near the space. apparatus.   2. The face-to-face communication apparatus according to claim 1, wherein the speaker outputs sound inside the room.   A microphone for inputting external noise is further installed in or near the space, the phase of both the microphone and the microphone for inputting sound outside the room is adjusted, and the sound is input to the microphone for inputting sound outside the room. 3. The face-to-face communication device according to claim 1, wherein external noise is suppressed.   4. The face-to-face communication device according to claim 3, wherein the microphone for inputting sound outside the room is a directional microphone installed on a transparent plate provided with the sound hole.   The face-to-face communication device according to claim 1, further comprising a proximity sensor that detects that a person has approached the face-to-face communication device.   6. The face-to-face communication device according to claim 5, further comprising a display device that notifies that the proximity sensor detects the proximity of a person.   7. The two-way call according to claim 5 or 6, wherein the two-way communication device normally operates only when the proximity sensor detects the proximity of a person and the microphone for inputting the voice inputs a voice. apparatus.   When carrying out a face-to-face call through a wall that partitions the inside and outside of the room, appropriate amplification suppression is performed for the other amplification system that faces the other when in a call state. Item 8. The face-to-face communication device according to any one of items 1 to 7.   The face-to-face communication device according to any one of claims 1 to 8, wherein a speaker for outputting sound outside the room and a microphone for inputting sound inside the room are provided inside the room.   A face-to-face call method in which a space composed of a transparent plate with sound holes provided on a wall separating the inside and outside of a room and a transparent plate that blocks sound is provided, and a face-to-face call is made through the space. The person in the room talks by inputting sound into the microphone in or near the space and outputting it to the speaker inside the room, and the person inside the room inputs the sound into the microphone inside the room and uses it. A face-to-face call method characterized in that a call is made by outputting to a speaker in the space or a place communicating with the space, and further to the outside of the room through the sound hole.

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