Two-way communication method, program, and wearable terminal

Abstract

To transmit necessary sound to other wearable devices in two-way communication between multiple wearable devices.SOLUTION: In a system for bidirectional sound communication between a first wearable terminal having a first microphone, a first memory unit, and a first speaker, and a second wearable terminal having a second microphone, a second memory unit, and a second speaker, a method according to an embodiment of the present disclosure includes a step of recording the sound from the direction of the head of the person wearing the first wearable terminal as sound louder than other sound in the first memory unit a first wearable terminal collects sound output by the second speaker or sound from the direction of the head of a person wearing the second wearable terminal with the first microphone, and transmitting the recorded sound to the second wearable terminal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a two-way communication method, a program, and a wearable terminal. [Background technology]

[0002] Conventionally, there is known a technology for two-way audio communication between multiple wearable devices (for example, web conferences, etc.). For example, Patent Document 1 describes a neck-worn device equipped with a microphone that wirelessly communicates with a server device on the cloud or with another neck-worn device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6786139 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in two-way communication between multiple wearable terminals (for example, assuming that two-way communication is taking place between multiple wearable terminals including two wearable terminals (wearable terminal A and wearable terminal B) located in close proximity to each other, such as in the same conference room), the following problems arise.

[0005] <Feedback> The voice uttered by the wearer of wearable device A is transmitted via communication and reproduced with a delay from the speaker of wearable device B. This reproduced sound is picked up by the microphone of wearable device A, reproduced with a delay from the speaker of wearable device B, picked up again by the microphone of wearable device A, reproduced again with a delay from the speaker of wearable device B, and so on, continuing infinitely, causing feedback.

[0006] <Sound quality deterioration> The voice spoken by the wearer of wearable device B is not only picked up by the microphone of wearable device B, but also by the microphone of wearable device A with a delay depending on the physical distance between wearable device A and wearable device B. This delay causes reverberation and echo, resulting in a deterioration in sound quality.

[0007] In this way, issues arise when one wearable device collects and transmits the sound played by another wearable device, as well as issues when one wearable device collects and transmits the voice spoken by the wearer of another wearable device.

[0008] An object of the present disclosure is to transmit a required sound to another wearable device in two-way communication between multiple wearable devices. [Means for solving the problem]

[0009] The method according to the first aspect of the present disclosure comprises: A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first memory unit, and a first speaker, and a second wearable terminal having a second microphone, a second memory unit, and a second speaker, The first wearable device collects sound output from the second speaker or sound from the direction of a head of a person wearing the second wearable device with the first microphone, a step of recording in the first storage unit a sound coming from a direction of a head of a person wearing the first wearable device as a sound louder than other sounds; transmitting the recorded sound to the second wearable device; Includes.

[0010] According to the first aspect of the present disclosure, a required sound can be transmitted to another wearable device.

[0011] A second aspect of the present disclosure is a method according to the first aspect, comprising: The first wearable terminal, The method includes a step of not transmitting the recorded sound to the second wearable device or transmitting it as silent data when no sound source is detected in the direction of the head of the person wearing the first wearable device.

[0012] According to the second aspect of the present disclosure, the voice of the wearer of the wearable device can be transmitted to other wearable devices.

[0013] A third aspect of the present disclosure is a method according to the first or second aspect, comprising: The first wearable terminal, The method includes a step of not transmitting the recorded sound to the second wearable device or transmitting it as silent data if a sound source with a volume equal to or greater than a predetermined volume is not detected in the direction of the head of the person wearing the first wearable device.

[0014] According to the third aspect of the present disclosure, a voice having a volume equal to or greater than a predetermined volume can be transmitted to another wearable device.

[0015] A fourth aspect of the present disclosure is a method according to any one of the first to third aspects, comprising: The first wearable terminal, The method includes a step of not transmitting the recorded sound to the second wearable device or transmitting it as silent data if a sound source that is a human voice is not detected in the direction of the head of the wearer of the first wearable device.

[0016] According to the fourth aspect of the present disclosure, a human voice can be transmitted to another wearable device.

[0017] A fifth aspect of the present disclosure is a method according to any one of the first to fourth aspects, comprising: The first wearable terminal, The method includes a step of not transmitting the recorded sound to the second wearable device or transmitting it as silent data if a sound source having a predetermined voiceprint is not detected in the direction of the head of the person wearing the first wearable device.

[0018] According to the fifth aspect of the present disclosure, the voice of a predetermined person can be transmitted to another wearable device.

[0019] A program according to a sixth aspect of the present disclosure, A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first memory unit, and a first speaker, and a second wearable terminal having a second microphone, a second memory unit, and a second speaker, The first wearable device collects the sound output by the second speaker or the sound from the direction of the head of the wearer of the second wearable device with the first microphone, a step of recording in the first storage unit a sound coming from the direction of the head of a person wearing the first wearable device as a sound louder than other sounds; Transmitting the recorded sound to the second wearable device. Execute the command.

[0020] A first wearable terminal according to a seventh aspect of the present disclosure includes: A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first memory unit, and a first speaker, and a second wearable terminal having a second microphone, a second memory unit, and a second speaker, The first wearable device collects a sound output from the second speaker or a sound from a direction of a head of a wearer of the second wearable device with the first microphone, Recording in the first storage unit a sound coming from the direction of the head of a person wearing the first wearable device as a sound louder than other sounds; The recorded sound is transmitted to the second wearable device. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a diagram showing an overall configuration according to an embodiment of the present disclosure. [Diagram 2] 1 is an example of a wearable terminal according to an embodiment of the present disclosure. [Diagram 3] 1 is a diagram for explaining the directionality of a microphone of a wearable terminal according to an embodiment of the present disclosure. FIG. [Figure 4] FIG. 2 is a diagram illustrating a hardware configuration of a wearable terminal according to an embodiment of the present disclosure. [Diagram 5] 1 is a diagram illustrating a hardware configuration of a two-way communication management device according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a functional block diagram of a control unit of a wearable terminal according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a sequence diagram of a process of bidirectional communication according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0023] <Terminology explanation> In this specification, a "terminal" refers to a terminal for two-way communication of at least sound between multiple terminals (e.g., web conference). For example, the terminal is a wearable terminal equipped with a microphone function. The terminal may be a personal computer equipped with a microphone function, or a personal computer to which one or more microphones are connected.

[0024] <Overall composition> Fig. 1 is a diagram showing an overall configuration according to an embodiment of the present disclosure. The two-way communication system 1 includes wearable terminals 10A and 10B (hereinafter collectively referred to as wearable terminals 10), a two-way communication management device 20, and a remote supporter terminal 30. Note that Fig. 1 illustrates a case where there are two wearable terminals 10 and one remote supporter terminal 30, but the number of terminals is not limited to this. Each will be described below.

[0025] <<Wearable devices>> The wearable terminal 10 is a terminal equipped with a microphone function (hereinafter also referred to as a microphone) and used by a field worker. For example, the wearable terminal 10 is a neck-hanging type terminal. The wearable terminal 10 can transmit and receive data to and from the two-way communication management device 20 via any network.

[0026] It is assumed that field worker 11A is a wearer of wearable terminal 10A, and field worker 11B is a wearer of wearable terminal 10B (hereinafter, field workers 11A and 11B are collectively referred to as field workers 11). It is assumed that field workers 11A and 11B are in a place (for example, the same site) where the playback sound of their own wearable terminal or their own voice is picked up by the microphone of another person's wearable terminal.

[0027] <<Two-way communication management device>> The two-way communication management device 20 is a device that manages at least audio two-way communication between multiple terminals (in the example of FIG. 1, the wearable terminals 10A and 10B and the remote supporter terminal 30). The two-way communication management device 20 is composed of one or more computers.

[0028] <<Remote supporter terminal>> The remote supporter terminal 30 is a terminal used by a remote supporter 31. For example, the remote supporter 31 supports the work of the on-site worker 11 at a remote location away from the site where the on-site worker 11 is working. For example, the remote supporter terminal 30 is a personal computer. The remote supporter terminal 30 can transmit and receive data to and from the two-way communication management device 20 via any network.

[0029] <Wearable device configuration> The wearable terminal 10 will be described in detail below with reference to FIGS.

[0030] Fig. 2 is an example of a wearable terminal 10 according to an embodiment of the present disclosure. For example, the wearable terminal 10 is a terminal having a neck-hanging shape as shown in Fig. 2. For example, the wearable terminal 10 includes a sound input unit (microphone) 105 as shown in Fig. 2. Furthermore, the wearable terminal 10 may include an operation unit 104, a sound output unit (speaker) 106, and an imaging unit (camera) 107 as shown in Fig. 2. Each unit will be described in detail with reference to Fig. 4.

[0031] <<Directivity of microphone function>> Here, the directionality of the microphone function of the wearable terminal 10 will be described. The microphone function of the wearable terminal 10 has directionality. For example, the directionality may be realized by using multiple omnidirectional microphones (microphone array), or a directional microphone may be used. In the wearable terminal 10 of FIG. 2, the directionality is realized by using multiple omnidirectional microphones.

[0032] FIG. 3 is a diagram for explaining the directionality of a microphone of a wearable terminal according to an embodiment of the present disclosure.

[0033] The axis that passes through the top of the wearer's head and is parallel to the wearer's midline is defined as the z-axis, with the wearer's upper body side being positive and the wearer's lower body side being negative. In other words, when the wearer leans his / her body, the z-axis also leans. The left-right direction of the wearer is defined as the x-axis, and the front-back direction of the wearer is defined as the y-axis. Due to the directionality of the microphone function, the wearable device 10 can record sounds from the positive direction of the z-axis (i.e., the direction from which the wearer speaks) as louder than other sounds.

[0034] <Hardware configuration> Hereinafter, an example of the hardware configuration of the wearable terminal 10 will be described with reference to FIG. 4, and an example of the hardware configuration of the two-way communication management device 20 will be described with reference to FIG.

[0035] 4 is a diagram showing a hardware configuration of the wearable terminal 10 according to an embodiment of the present disclosure. The wearable terminal 10 can include a control unit (processor) 101, a storage unit (memory) 102, a communication unit 103, an operation unit 104, a sound input unit (microphone) 105, a sound output unit (speaker) 106, an imaging unit (camera) 107, and various sensors 108. Each of these will be described below.

[0036] The control unit (processor) 101 is a processor that controls the wearable terminal 10. For example, the control unit (processor) 101 is a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or the like.

[0037] The storage unit (memory) 102 is a memory that stores any data.

[0038] The communication unit 103 connects to an arbitrary network and communicates with other computers (such as the bidirectional communication management device 20).

[0039] The operation unit 104 is a button or the like that allows the field worker 11 to input instructions to the wearable terminal 10.

[0040] Sound is collected by the sound input unit (microphone) 105. As described above, the sound input unit (microphone) 105 has directionality.

[0041] The sound output unit (speaker) 106 outputs sound (for example, sound collected by another terminal and acquired via the two-way communication management device 20).

[0042] An imaging unit (camera) 107 captures still images and moving images.

[0043] The various sensors 108 are one or more arbitrary sensors such as an acceleration sensor, a GPS (Global Positioning System), and the like.

[0044] 5 is a diagram showing a hardware configuration of the two-way communication management device 20 according to an embodiment of the present disclosure. The same applies to the remote supporter terminal 30. The two-way communication management device 20 can include a control unit (processor) 201, a storage unit (memory) 202, and a communication unit 203. Each of these will be described below.

[0045] The control unit (processor) 201 is a processor that controls the bidirectional communication management device 20. For example, the control unit (processor) 201 is a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or the like.

[0046] The storage unit (memory) 202 is a memory that stores any data.

[0047] The communication unit 203 connects to an arbitrary network and communicates with other computers (the wearable terminal 10, the remote supporter terminal 30, etc.).

[0048] 6 is a functional block diagram of the control unit 101 of the wearable terminal 10 according to an embodiment of the present disclosure. The control unit 101 of the wearable terminal 10 includes a sound collection unit 111, a determination unit 112, and a sound transmission unit 113. The control unit 101 of the wearable terminal 10 functions as the sound collection unit 111, the determination unit 112, and the sound transmission unit 113 by executing a program.

[0049] The sound collection unit 111 records (stores) in the memory unit "sound coming from the direction of the head of the person wearing the wearable device 10" as a sound louder than "other sounds," and records (stores) in the memory unit "other sounds" as sounds quieter than "sound coming from the direction of the head of the person wearing the wearable device 10." For example, the sound collection unit 111 forms directivity using multi-channel sounds collected by multiple omnidirectional microphones (microphone array) to create one-channel sound.

[0050] In this way, it is possible to reduce the adverse effects of picking up sounds output by speakers of other wearable devices or sounds coming from the direction of the head of the person wearing the other wearable device (i.e., voices spoken by the person wearing the other wearable device).

[0051] The determination unit 112 determines whether the sound recorded in the storage unit by the sound collection unit 111 is a valid sound source or an invalid sound source. Below, we will explain separately [When it is determined that the sound is always a valid sound source] and [When it is determined that the sound source is a valid sound source or an invalid sound source].

[0052] [When it is determined to be a constantly active sound source] The determination unit 112 constantly determines that the sound coming from the direction of the head of the person wearing the wearable device 10, which is recorded in the storage unit by the sound collection unit 111, is a valid sound source.

[0053] [When determining whether a sound source is valid or invalid] The determination unit 112 determines whether the sound recorded by the sound collection unit 111 in the storage unit is a valid sound source or an invalid sound source. A method for determining whether a sound source is valid or invalid will be described below. Note that the determination may be made by combining two or more of the following [directivity + sound source + volume], [directivity + sound source + human voice], and [directivity + sound source + predetermined voiceprint].

[0054] [Directivity + sound source] For example, when the determination unit 112 detects a sound source in the direction of the head of the wearer of the wearable terminal 10, the determination unit 112 determines that the sound recorded in the storage unit is a valid sound source (note that the determination unit 112 may estimate the sound source by any method). In this case, the sound source can be determined as a valid sound source only when the wearer is speaking. On the other hand, when the determination unit 112 does not detect a sound source in the direction of the head of the wearer of the wearable terminal 10 (that is, when the determination unit 112 detects a sound source other than the direction of the head of the wearer of the wearable terminal 10), the determination unit 112 determines that the sound recorded in the storage unit is an invalid sound source. Note that when the determination unit 112 detects a sound source in the direction of the head of the wearer of the wearable terminal 10 and within a certain distance from the microphone, the determination unit 112 may determine that the sound from the direction of the head of the wearer of the wearable terminal 10 is a valid sound source.

[0055] [Directivity + Sound source + Volume] For example, when the determination unit 112 detects a sound source with a volume equal to or greater than a predetermined volume in the direction of the head of the wearer of the wearable terminal 10, the determination unit 112 determines that the sound recorded in the storage unit is an effective sound source. In this case, small noises can be excluded and the voice emitted by the wearer can be determined as the effective sound source. On the other hand, when the determination unit 112 does not detect a sound source with a volume equal to or greater than a predetermined volume in the direction of the head of the wearer of the wearable terminal 10 (that is, when the determination unit 112 detects a sound source other than the direction of the head of the wearer of the wearable terminal 10, or when the determination unit 112 detects a sound source with a volume less than the predetermined volume in the direction of the head of the wearer of the wearable terminal 10), the determination unit 112 determines that the sound recorded in the storage unit is an ineffective sound source.

[0056] [Directivity + Sound source + Human voice] For example, when the determination unit 112 detects a sound source that is a human voice in the direction of the head of the wearer of the wearable terminal 10, the determination unit 112 determines that the sound recorded in the storage unit is a valid sound source (note that the determination unit 112 may determine whether or not the sound is a human voice using VAD (Voice Activity Detection) or the like). In this case, noise other than human voices can be excluded and the voice emitted by the wearer can be determined as the valid sound source. On the other hand, when the determination unit 112 does not detect a sound source that is a human voice in the direction of the head of the wearer of the wearable terminal 10 (that is, when the determination unit 112 detects a sound source other than the direction of the head of the wearer of the wearable terminal 10, or when the determination unit 112 detects a sound source other than a human voice in the direction of the head of the wearer of the wearable terminal 10), the determination unit 112 determines that the sound recorded in the storage unit is an invalid sound source.

[0057] [Directivity + Sound source + Predetermined voiceprint] For example, when the determination unit 112 detects a sound source that is a voice with a predetermined voiceprint in the direction of the head of the wearer of the wearable terminal 10, the determination unit 112 determines that the sound recorded in the storage unit is a valid sound source (note that the determination unit 112 may determine whether or not the voice is a voice with a predetermined voiceprint by using a trained model that is machine-learned using a predetermined voiceprint (specifically, the voiceprint of the wearer of the wearable terminal 10) as learning data and that determines whether or not the voice is a voice with a predetermined voiceprint). In this case, voices other than those of the wearer and noise can be excluded, and the voice uttered by the wearer can be determined as a valid sound source. On the other hand, when the determination unit 112 does not detect a sound source that is a voice with a predetermined voiceprint in the direction of the head of the wearer of the wearable terminal 10 (that is, when a sound source other than the direction of the head of the wearer of the wearable terminal 10 is detected, or when a sound source other than a voice with a predetermined voiceprint is detected in the direction of the head of the wearer of the wearable terminal 10), the determination unit 112 determines that the sound recorded in the storage unit is an invalid sound source.

[0058] The sound transmitting unit 113 transmits the sound stored in the storage unit to the two-way communication management device 20 (the sound is then transmitted to other wearable terminals via the two-way communication management device 20). Specifically, the sound transmitting unit 113 transmits the sound that the determination unit 112 has determined to be a valid sound source to the two-way communication management device 20.

[0059] If the sound transmitting unit 113 determines that the sound recorded in the storage unit is an invalid sound source, it may not transmit the sound recorded in the storage unit to the two-way communication management device 20 or may transmit it as silent data. Specifically, if no sound is transmitted, no data is transmitted (i.e., zero bits), and if sound is transmitted as silent data, data indicating silence (i.e., data consisting of successive zeros for the data length) is transmitted. Note that Gaussian noise data may be used instead of silent data.

[0060] <Signal Processing> An example of signal processing is explained below. Multi-channel sound collected by multiple microphones is split into two, one of which is made directive and converted into a single-channel sound, and the other is used to determine whether it is an effective or ineffective sound source.

[0061] If it is determined to be a valid sound source, the one-channel sound with directionality is used as is. Note that a web conference application in the wearable device 10 may obtain the one-channel sound with directionality and transmit it to the two-way communication management device 20.

[0062] If it is determined to be an invalid sound source, a zero bit (i.e., no sound is transmitted) or data consisting of continuous zeros for the data length (i.e., sound is transmitted as silent data) is used instead of a one-channel sound with directivity. Note that a web conference application in the wearable device 10 may obtain the sound of silent data and transmit it to the two-way communication management device 20.

[0063] <Other> In an embodiment of the present disclosure, directivity may be formed only when a sound source is determined to be an effective sound source in the determination of whether the sound source is an effective sound source or an ineffective sound source.

[0064] The function related to the present disclosure (i.e., the function of recording sounds coming from the direction of the head of the wearer of the wearable device 10 as sounds louder than other sounds in a memory unit and transmitting the recorded sounds to other wearable devices) may be enabled by default for the wearable device 10, or may be enabled when participating in two-way communication such as a web conference.

[0065] <Processing method> FIG. 7 is a sequence diagram of a process of two-way communication according to an embodiment of the present disclosure.

[0066] The microphone of wearable terminal 10A has directionality. The microphone of wearable terminal 10A collects sound output by the speaker of wearable terminal 10B or sound from the direction of the head of the person wearing wearable terminal 10B (wearable terminal 10A may determine by any method that the sound is output by the speaker of wearable terminal 10B or sound from the direction of the head of the person wearing wearable terminal 10B).

[0067] In step 11 (S11), the wearable terminal 10A records in the storage unit a sound coming from the direction of the head of the person wearing the wearable terminal 10A as a sound louder than other sounds.

[0068] In step 12 (S12), the wearable terminal 10A judges whether the sound recorded in the storage unit in S11 is an effective sound source or an ineffective sound source. The following will explain the case where it is judged to be a constant effective sound source and the case where it is judged to be an effective sound source or an ineffective sound source.

[0069] [When it is determined to be a constantly active sound source] The wearable terminal 10A constantly determines that the sound coming from the direction of the head of the person wearing the wearable terminal 10A, which was recorded in the storage unit in S11, is a valid sound source.

[0070] [When determining whether a sound source is valid or invalid] The wearable terminal 10A determines whether the sound coming from the direction of the head of the person wearing the wearable terminal 10A, which was recorded in the storage unit in S11, is a valid sound source or an invalid sound source.

[0071] In step 13 (S13), the wearable terminal 10A transmits the sound recorded in the storage unit to the two-way communication management device 20. Specifically, the wearable terminal 10A transmits to the two-way communication management device 20 the sound determined to be a valid sound source in S12.

[0072] If the wearable terminal 10A determines that the sound recorded in the storage unit is an invalid sound source, the wearable terminal 10A may not transmit the sound recorded in the storage unit to the two-way communication management device 20 or may transmit the sound as silent data.

[0073] In Step 14-1 (S14-1) and Step 14-2 (S14-2), the two-way communication management device 20 transmits to the wearable terminal 10B and the remote supporter terminal 30 the sound acquired in S13 (that is, the sound collected by the wearable terminal 10A).

[0074] When a stationary speaker with microphone is used as the terminal rather than a wearable terminal, it is difficult to determine in advance the direction of the required sound (for example, the positional relationship between the field worker and the stationary speaker with microphone is fluid), but when a neck-worn wearable terminal is used as in the present disclosure, it is possible to determine in advance the sound from the required direction, such as sound from the direction of the wearer's head, making this a preferred embodiment.

[0075] Although the embodiments have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. [Explanation of symbols]

[0076] 1. Two-way communication system 10A Wearable Devices 10B Wearable devices 11A Field worker 11B Field worker 20 Two-way communication management device 30 Remote supporter terminal 31 Remote Supporter 101 Control unit (processor) 102 Memory unit (memory) 103 Communications Department 104 Operation section 105 Sound input section (microphone) 106 Sound output unit (speaker) 107 Imaging unit (camera) 108 Various sensors 111 Sound collection section 112 Judgment section 113 Sound transmitter 201 Control unit (processor) 202 Memory unit (memory) 203 Communications Department

Claims

1. A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first storage unit, and a first speaker, and a second wearable terminal having a second microphone, a second storage unit, and a second speaker, The first wearable device collects sound output from the second speaker or sound from the direction of a head of a wearer of the second wearable device with the first microphone, recording in the first storage unit a sound coming from a direction of a head of a person wearing the first wearable device as a sound louder than other sounds; Transmitting the recorded sound to the second wearable device; The method includes:

2. The first wearable terminal, When a sound source is not detected in the direction of a head of a person wearing the first wearable device, the recorded sound is not transmitted to the second wearable device or transmitted as silent data.

2. The method of claim 1, comprising:

3. The first wearable terminal, a step of not transmitting the recorded sound to the second wearable device or transmitting the recorded sound as silent data when a sound source having a volume equal to or greater than a predetermined volume is not detected in the direction of a head of a person wearing the first wearable device; 2. The method of claim 1, comprising:

4. The first wearable terminal, When a sound source that is a human voice is not detected in the direction of a head of a person wearing the first wearable device, the recorded sound is not transmitted to the second wearable device or is transmitted as silent data.

2. The method of claim 1, comprising:

5. The first wearable terminal, a step of not transmitting the recorded sound to the second wearable device or transmitting the recorded sound as silent data when a sound source having a predetermined voiceprint is not detected in the direction of a head of a wearer of the first wearable device; 2. The method of claim 1, comprising:

6. A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first storage unit, and a first speaker, and a second wearable terminal having a second microphone, a second storage unit, and a second speaker, The first wearable device collects the sound output by the second speaker or the sound from the direction of the head of the wearer of the second wearable device with the first microphone, a step of recording in the first storage unit a sound coming from a direction of a head of a person wearing the first wearable device as a sound louder than other sounds; Transmitting the recorded sound to the second wearable device. A program for executing the above.

7. A system for bidirectionally communicating sound between a first wearable terminal having a first microphone, a first storage unit, and a first speaker, and a second wearable terminal having a second microphone, a second storage unit, and a second speaker, The first wearable terminal collects a sound output from the second speaker or a sound from a direction of a head of a wearer of the second wearable terminal with the first microphone, Recording in the first storage unit a sound coming from the direction of a head of a person wearing the first wearable device as a sound louder than other sounds; A first wearable device that transmits the recorded sound to the second wearable device.

Images