JP2014143582A - Communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce sound leakage to the surrounding at the time of call.SOLUTION: A communication device includes a voice input section for collecting inaudible murmur containing the body conduction sound of murmur without vibration of vocal cord, a transmission section for transmitting the voice signal obtained from the voice input section, a receiving section for receiving an external voice signal, and a born conduction output section for outputting the voice signal obtained from the receiving section by born conduction.

Description

  The present invention relates to a call device, and more particularly to a call device that reduces sound leakage to surroundings during a call.

  Conventionally, when a program is recorded in a studio of a broadcasting station, an intercommunication private telephone such as an inter-communication is used in order to realize a telephone call between staff members (for example, see Patent Document 1). . The intercom can be worn on the user's head like a headphone, so that it is possible to make a voice call with a free hand.

JP-A-10-262162

  However, when income or the like is used, the voice spreads to the surroundings because it is necessary to speak like a normal conversation. As a result, in the recording studio, the voice of the staff talking is mixed into the broadcasting sound collecting microphone. The income is attached so as to directly block one or both ears of the user so that sound from the speaker does not leak outside. Therefore, there is a problem that during a call, attention to surrounding sounds (especially in the direction in which the ears are blocked) cannot be taken into account, and surrounding conditions cannot be grasped. The essence of this problem stems from the act of uttering voice in the air and listening to sound in the air itself.

  In view of such a problem, an object of the present invention is to provide a call device that reduces sound leakage to the surroundings during a call.

  In order to solve the above problems, the present invention employs means for solving the problems having the following characteristics.

  The communication device according to one aspect includes a voice input unit that collects a non-audible muttering sound including a muffled body conduction sound without vibration of a vocal cord, a transmission unit that transmits a voice signal obtained by the voice input unit, and an external device And a bone conduction output unit for outputting the voice signal obtained by the reception unit by bone conduction.

  ADVANTAGE OF THE INVENTION According to this invention, the sound leakage to the circumference | surroundings at the time of a telephone call can be reduced.

It is a figure which shows an example of schematic structure of a telephone call system. It is a figure which shows an example of a function structure of a communication apparatus. It is a figure which shows the schematic example of the audio | voice input by a NAM microphone. It is a figure for demonstrating the specific example of the process in a signal processing part. It is FIG. (1) which shows the specific example and mounting example of a telephone apparatus. It is FIG. (The 2) which shows the specific example and mounting example of a telephone apparatus. It is FIG. (The 3) which shows the specific example and mounting example of a telephone apparatus. It is FIG. (The 4) which shows the specific example and mounting example of a telephone apparatus. It is FIG. (The 5) which shows the specific example and mounting example of a telephone apparatus. It is a figure which shows the other specific example of a communication apparatus.

<About the present invention>
The call device according to the present invention realizes a silent voice interface. The silent voice interface is a technique for making a call without leaking the voice to the surroundings, and enables communication between the speaker and the listener, such as telepathy. Therefore, for example, even if the speaker side talks loosely so as not to be heard by the surroundings, a mechanism is provided so that the listener side can hear a natural voice.

  Specifically, the voice transmission side of the telephone device uses a body conduction voice technology such as a non-audible murmur (NAM) as an example of a silent voice interface. Normally, when a person speaks, a human voice is based on sound generated by vibrating the vocal cords. A non-audible tweet is, for example, an act of moving the mouth with exhalation without vocal cord vibration. Including. The NAM microphone (hereinafter referred to as “NAM microphone”) collects the sound conducted through the body.

  Non-audible murmurs can be expected to generate contact voice without leaking sound to the outside world by using vibration in the body without using air as a medium. It is similar to bone conduction, but it is "meat conduction" that uses human flesh as an audio transmission medium, not bone as a medium.

  That is, according to the present invention, the NAM microphone is used to collect the speech of the user with a very small whispering voice, so that it is recorded as the body conduction voice. As a result, it is possible to utter while reducing sound leakage to the surroundings as much as possible, and it is possible to utter even if the mouth is covered with a highly sound-insulating mask or the like. Therefore, in this invention, you may use together the mask which covers a part or all of a user's mouth.

  In addition, the present invention improves the quality of speech clarity and naturalness through statistical signal processing by performing in-vivo conduction speech enhancement processing in real time on speech recorded by a NAM microphone as necessary. May be.

  Furthermore, on the voice receiving side in the communication device, the user listens using a bone conduction speaker as an example of a silent voice interface. Accordingly, since it is possible to listen to the call voice without closing the ear, it is possible to simultaneously listen to surrounding sounds. As a result, it is possible to realize a call in which sound is hardly leaked to the surroundings without causing air to vibrate on both the sound emitting side and receiving side. Hereinafter, a preferred embodiment of a telephone device will be described in detail with reference to the drawings.

<Example of schematic configuration of call system>
FIG. 1 is a diagram illustrating an example of a schematic configuration of a call system. FIG. 1 shows a call system 10 used in a broadcasting station as an example. The call system 10 includes a call device 11 and a sub adjustment room 12, and the call device 11 and the sub adjustment room 12 include a communication network 13 such as a local area network (LAN) or the Internet using wireless or wired communication. Is connected in a state where data can be transmitted and received.

  The call device 11 is a device used by a staff member such as a cameraman, an assistant director (AD), a voice person, and a lighting person who shoots a program in a studio 14 where the program is recorded. It has a function as an income to make a call with a producer in the office and other staff in the studio 14.

  In the example of the call system 10 shown in FIG. 1, three call apparatuses 11-1 to 11-3 are shown, but the number is not limited to this, and at least one call apparatus 11 is used. As long as it has. In the call system 10, which user is using which call device 11 is managed, and a call can be made to one or a plurality of users to be set.

  Here, the communication device 11 shown in FIG. 1 includes a NAM microphone 21, a bone conduction speaker 22, a band unit 23, and a protection unit 24. As described above, the NAM microphone 21 collects voices of very small whispering sounds (for example, non-audible whispering sounds) of the user. The NAM microphone 21 has high noise resistance against sound propagating in the air.

  The bone conduction speaker 22 outputs vibration based on the audio signal received via the communication network 13 to the user's body (bone), and transmits the sound directly to the auditory nerve, for example, through the skull. Note that various methods such as a piezoelectric element method, a giant magnetostrictive element method, and a coil element method can be used as the bone conduction method in the present embodiment, but the present invention is not limited to this. By having the NAM microphone 21 and the bone conduction speaker 22, sound leakage to the surroundings during a call can be reduced.

  The band unit 23 holds the communication device 11 main body between the user's head and neck. The band portion 23 is formed in a semicircular shape as shown in FIG. 1, for example, and the semicircular portion has a predetermined elasticity. The semicircular portion can be held at a predetermined position by fitting it into the user's head or neck. At this time, the NAM microphone 21 and the bone conduction speaker 22 described above are preferably held in contact with the user, but the present invention is not limited to this.

  The band unit 23 adjusts the size and diameter width of the semicircle described above, the position of the NAM microphone 21 and the protection unit 24 attached to the band unit 23, and the like according to the size of the user's head and neck. It has an adjustment mechanism that can. Since the communication device 11 is detachably attached by the band unit 23, the user's hand is secured.

  Further, the communication device 11 shown in FIG. 1 may have a protection unit 24 having a predetermined elasticity so as not to hurt when the communication device 11 is sandwiched between the user's head or neck. . As the protection unit 24, for example, an elastic body such as rubber, sponge, or soft resin, or a soft material such as cloth or cotton can be used. However, the present invention is not limited to this. It may be formed in a smooth curved surface in which the contact portion with the skin is chamfered. Thereby, the contact with skin becomes soft.

  Further, the communication device 11 according to the present embodiment may hold the call device 11 by sandwiching the head between the NAM microphone 21 and the protection unit 24 shown in FIG. You may hold | maintain by putting the ear hook part on an ear.

  The sub-adjustment room 12 is connected to a “main adjustment room” for sending out of the operation rooms for operating devices provided in various studios 14 in broadcasting stations such as televisions and radios, and a broadcasting line. This is an operation room for operating the program production equipment to adjust audio and video.

  In the sub-adjustment room 12, the video sent from each camera in the studio 14 and the audio sent from each microphone are viewed. In addition, the sub-adjustment room 12 receives the report from the staff such as the floor director, each cameraman, AD, voice staff, lighting staff, etc. in the studio 14 by the voice signal through the communication device 11 and judges the status of the studio 14. To do.

  In the sub-adjustment room 12, an audio signal such as an instruction is output from the producer or the like to the call device 11 used by a predetermined user in the studio 14. Since the sub-adjustment room 12 is outside the studio 14, for example, a normal microphone, a speaker, or the like may be used without using the communication device 11 as shown in the present embodiment.

  In the call system 10 shown in FIG. 1, the call device 11 can make a call between the call devices 11 as well as a call with the auxiliary adjustment room 12. In this case, it is possible to make a call only to a predetermined call device 11 by switching the frequency (channel) such as a transceiver.

<Example of Functional Configuration of Call Device 11>
Next, a functional configuration example of the above-described call device 11 will be described with reference to the drawings. In the following description, components having substantially the same functions as those described above are denoted by the same reference numerals, and detailed description thereof is omitted here. FIG. 2 is a diagram illustrating an example of a functional configuration of the call device. 2 includes a NAM microphone 21 as an example of a voice input unit, a bone conduction speaker 22 as an example of a bone conduction output unit, a signal processing unit 31, a transmission unit 32, and a reception unit 33. And a signal converter 34.

  As described above, the NAM microphone 21 collects a user's non-audible murmur and the like and inputs the voice, and outputs the input voice signal to the signal processing unit 31. In the present embodiment, the signal obtained from the NAM microphone 21 may be amplified to a predetermined size using an amplifier (amplifying unit) or the like.

  The signal processing unit 31 performs signal processing for increasing the recognition rate on the listener side for the audio signal obtained from the NAM microphone. Specific processing contents in the signal processing unit 31 will be described later. The signal processed by the signal processing unit 31 is transmitted to the transmission unit 32. In the present embodiment, it is not necessary to perform processing in the signal processing unit 31 on the audio signal obtained from the NAM microphone 21. Whether or not to perform the processing by the signal processing unit 31 may be set in advance by the user, for example, or when the recognition rate is estimated to be low from the volume or frequency characteristics of the sound input by the NAM microphone 21 Alternatively, the signal processing unit 31 may perform processing.

  The transmission unit 32 transmits an audio signal obtained directly from the signal processing unit 31 or the NAM microphone 21 to a predetermined transmission destination (for example, the auxiliary adjustment room 12 or another communication device 11). The transmission unit 32 may transmit the audio signal to one or a plurality of transmission destinations set in advance, and is provided with a selection unit that selects which transmission destination to transmit, and is selected by the selection unit An audio signal may be transmitted to the transmission destination.

  The reception unit 33 receives an audio signal from a predetermined reception destination (for example, the auxiliary adjustment room 12 or another communication device 11). The receiving unit 33 may receive an audio signal from a preset receiving destination, and also includes a selecting unit that selects which receiving destination to receive from the receiving destination selected by the selecting unit. An audio signal may be received.

  The signal converter 34 converts the audio signal received by the receiver 33 into a vibration signal that is conducted to the user's bone. The signal conversion is preferably performed in accordance with, for example, the bone conduction method in the bone conduction speaker 22, but is not limited thereto.

<About NAM microphone 21>
Here, for the NAM microphone 21 described above, for example, a technique described in Japanese Patent No. 3760173, Japanese Patent No. 4702795, or the like can be used. FIG. 3 is a diagram showing a schematic example of voice input by the NAM microphone.

  As shown in FIG. 3, the communication device 11 according to the present embodiment is mounted so that the NAM microphone 21 and the protection unit 24 at both ends of the band unit 23 sandwich the neck and the head, and the non-audible whispering voice is transmitted from the NAM microphone 21. Collect the signal. The NAM microphone 21 is, for example, a voice that does not accompany the regular vibration of the vocal cords, and is a microphone (mesh conduction microphone) that collects vibration sound (breathing sound) that conducts (internally conducts) non-audible soft tissue in the body from outside. .

  Specifically, the NAM microphone 21 includes a soft silicon portion 51, a vibration sensor 52, an electrode 53, and a sound insulation cover 54. The soft silicon part 51 is a soft member (for example, a silicon member) that is in contact with the skin of the user 40, and generates vibrations that are generated as air vibrations in the vocal tract of the user 40, and then vibrates the skin. Output to the vibration sensor 52. For example, as shown in FIG. 3, the vocal tract is an airway portion (a portion extending from the vocal cords to the lips including the oral cavity and the nasal cavity) on the downstream side of the vocal cords in the direction of breathing.

  The vibration sensor 52 contacts the soft silicon portion 51 and converts the vibration of the soft silicon portion 51 into an electric signal. An electrical signal obtained by the vibration sensor 52 is output to the outside through the electrode 53.

  The sound insulation cover 54 is a soundproof material that prevents vibration propagated through the surrounding air other than the skin with which the soft silicon portion 51 contacts from being transmitted to the soft silicon portion 51 and the vibration sensor 52.

  Note that the NAM microphone 21 is attached so as to come into contact with the skin surface on the thoracic papillary muscle immediately below the mastoid process of the skull in the lower part of the user's 40 pinna as shown in FIG. 3, for example. As a result, vibrations generated in the vocal tract (that is, vibrations of non-audible murmured voice) are propagated to the soft silicon part 51 through the part where the bone does not exist in the speaker (the meat part) almost at the shortest. The mounting position of the NAM microphone 21 is not limited to this, and may be, for example, near the vocal tract or the vocal cords.

<Specific Example of Processing in Signal Processing Unit 31>
Next, a specific example of processing in the signal processing unit 31 described above will be described with reference to the drawings. FIG. 4 is a diagram for explaining a specific example of processing in the signal processing unit. In this embodiment, in order to improve quality so that real-time in-vivo conduction speech such as inaudible murmurs can be easily recognized by the listener, speech enhancement processing using a conversion model based on statistical signal processing is performed.

  Specifically, as shown in FIG. 4, a plurality of preset sentences (for example, 50 or more) having the same content are transmitted into the body conduction voice using the NAM microphone 21 and the normal voice (natural voice) uttered from the mouth. ) And learning using the same utterance data of meat conduction speech and natural speech to generate a conversion model. Specifically, in each of the meat conduction speech and the natural speech, a spectral feature amount is extracted in a unit of a section divided by a time frame of about several tens of milliseconds, and based on the extracted spectral feature amount, By learning the correspondence, a conversion model for converting from meat conduction speech to natural speech is generated.

  The signal processing unit 31 can convert the meat conduction sound into the natural sound by using the conversion model described above for the sound obtained from the NAM microphone 21. As described above, the processing in the signal processing unit 31 can improve the voice recognition rate on the listener side (voice receiving side).

  For example, the method described in Japanese Patent No. 4940414 can be used as a conversion model generation method, but the method is not limited to this, and other methods may be used. In the method of Japanese Patent No. 4940414, a predetermined feature amount is calculated for each of the learning input signal for inaudible speech and the learning output signal for audible whispering speech corresponding to the learning input signal recorded by the microphone. Based on the calculation result, learning calculation of model parameters in a vocal tract feature value conversion model that converts the feature value of a non-audible speech signal into the feature value of an audible whispering speech signal is performed, and the model parameter after learning is predetermined. Is stored in the storage means. Next, a feature amount is calculated for the input inaudible speech signal, and an audible whisper sound corresponding to the input inaudible speech signal is calculated based on the calculation result and a vocal tract feature amount conversion model in which model parameters after learning are set. Is calculated, and an audible whisper voice signal corresponding to the input inaudible voice signal is generated.

  Further, in the present embodiment, for example, the processing by the signal processing unit 31 is performed only when the recognition rate is estimated to be low from the volume or frequency characteristic of the sound input by the NAM microphone 21 or when the user sets. In other cases, the processing by the signal processing unit 31 may not be performed.

<Specific Example and Wearing Example of Call Device 11>
Next, a specific example and a mounting example of the communication device 11 will be described. 5 to 9 are diagrams (parts 1 to 5) illustrating specific examples and mounting examples of the communication device. 5A to 9A show specific examples of the communication devices 11a to 11e, and FIGS. 5B to 9B show examples of mounting the communication devices 11a to 11e. Yes.

  In the communication device 11a shown in the example of FIG. 5A, the bone conduction speaker 22 is formed as an earphone 61, and is connected to another configuration (for example, the NAM microphone 21 or the like) of the communication device 11a by a cable 62. . As shown in FIG. 5B, the communication device 11 a sandwiches the band portion 23 around the neck of the user 40, and the NAM microphone 21 and the protection member 24 in the vicinity of both ends of the band portion 23 allow the user 40 to make a predetermined call. The NAM microphone 21 is attached so as to be in close contact with a predetermined part by sandwiching a part (for example, the vicinity of the vocal cords or the lower left and right auricles). By wearing in this way, the NAM microphone 21 can collect only the sound that propagates mainly through the soft composition of the human body, so even if the ambient noise (noise sound) is high The human body functions as a noise removal filter, and can acquire an audio signal with a high S / N ratio. In the example of FIG. 5, since the bone conduction speaker 22 has an earphone shape, it is easier to hear surrounding sounds than to cover the entire ear with a headphone shape.

  In the example of FIG. 6A, the ear hooking portion 63 is provided in the bone conduction speaker 22 of the communication device 11b as compared with the communication device 11a shown in FIG. 5 described above. With this configuration, as shown in FIG. 6B, the communication device 11a hangs the ear hook 63 on the ear of the user 40 so that the bone conduction speaker 22 is in contact with the vicinity of the front of the ear. Installing. As a result, both ears are not completely blocked, and surrounding sounds can be properly grasped while talking.

  Note that the configuration of the bone conduction speaker 22 in which both ears are not blocked is not limited to the configuration having the ear hooking portion 63 shown in FIGS. 6A and 6B described above. For example, the bone conduction speaker 22 is used in the bone conduction speaker 22. An adhesive member, a suction cup, or the like that can be pasted on the contact surface of the person 40 with the skin may be provided so as to be in close contact with the user 40 under the ear or near the temple.

  In the example of FIG. 7A, the ear hooking portions 63 can be provided at both ends of the band portion 23 of the communication device 11c, and the bone conduction speaker 22 can be provided at each ear hooking portion 63. In this case, since the communication device 11c can be fixed by the band unit 23 and each ear hook unit 63, the protection unit 24 can be omitted. In addition, in the communication apparatus 11c shown in FIG. 7, although the bone conduction speaker 22 is provided in the ear hook part 63 of both ends, it is not limited to this, Either may be sufficient.

  As a result, as shown in FIG. 7 (B), it is not necessary to sandwich the NAM 21 and the protection unit 24 between the NAM 21 and the protection unit 24, and the user 40 can be mounted with a reduced burden.

  In the example of FIG. 8A, a removable mask 64 is provided at the end of the band portion 23 of the communication device 11d. The mask 64 has a mask main body 64a and an ear hooking portion 64b. As shown in FIG. 8B, the mask main body 64a covers part or all of the mouth of the user 40 when worn. The mask body 64a may be, for example, a cloth shape or a sheet shape. Moreover, the mask main body 64a may have a detachable gauze or the like on part or all of the surface in contact with the mouth. The ear hook 64b is an elastic body such as rubber, but is not limited thereto.

  In this embodiment, since it is possible to talk without opening the mouth and making a voice, it is possible to talk even if the mask 64 is attached, and sound leakage to the surroundings can be reduced as much as possible.

  In the example of FIG. 9A, the bone conduction speaker 22 is provided in the ear hooking portion 64b of the communication device 11e. The bone conduction speaker 22 shown in FIG. 9A can be detachably attached to any position of the ear hook 64b.

  At the time of wearing shown in FIG. 9B, the bone conduction speaker 22 can be brought into close contact with the user 40 at a predetermined position by an ear hooking portion 64b which is an elastic body such as rubber. Therefore, the audio signal (vibration) can be transmitted to the user 40 with high accuracy. In the case of the example shown in FIG. 9, a cable or the like is provided from the body of the communication device 11e to the inside of the mask 64 to be connected to another configuration (for example, the receiving unit 33) and send a signal to the bone conduction speaker 22. be able to.

  In the example of FIG. 9, the example in which the bone conduction speaker 22 is provided on the mask 64 is shown. However, the present embodiment is not limited to this, and for example, the NAM microphone 21 may be provided on the mask 64. In addition, both the NAM microphone 21 and the bone conduction speaker 22 may be provided on the mask 64. Further, when both the NAM microphone 21 and the bone conduction speaker 22 are provided on the mask 64, the band portion 23 can be configured.

  In the example shown in FIGS. 5 to 9 described above, an example of a neckband type in which the neck is sandwiched by the band portion 23 is shown, but the present invention is not limited to this, and for example, the head is sandwiched by the band portion 23. A headphone type configuration may be used. In the present embodiment, the NAM microphone 21 can pick up the sound most efficiently at the lower rear part of the ear, and the bone conduction speaker 22 can be transmitted more efficiently when provided near the eardrum or the skull. In the case where the communication device 11 is used, etc., a neckband type or the like is preferable.

  The NAM microphone 21 described above is not limited to a meat conduction microphone, and may be a bone conduction microphone or a throat microphone, for example. The NAM microphone 21 and the bone conduction speaker 22 described above may be provided for the left and right ears, or a plurality of them may be provided for one ear.

  Further, the communication device 11 in the present embodiment may have a configuration in which a part of the configuration of each of the above-described communication devices is combined as shown in FIGS. FIG. 10 is a diagram showing another specific example of the communication device. The communication device 11f shown in FIG. 10 is configured such that the bone conduction speaker 22 is detachable as compared with the communication device 11a shown in FIG.

  In the example of FIG. 10, a plug (male terminal) 65 is provided at the tip of the cable 62 coming out from the earphone 61 of the bone conduction speaker 22, and a jack (female terminal) 66 corresponding to the plug 65 is provided on the NAM microphone 21. Is provided. The communication device 11f can be electrically connected to other components by inserting the plug 65 into the jack 66, and can transmit and receive signals.

  With the configuration of the communication device 11f shown in FIG. 10, for example, the earphone-type bone conduction speaker 22 shown in FIG. 10 is replaced with an ear-hook type bone conduction speaker 22 as shown in FIG. The speaker 22 can be replaced with a normal earphone that is not bone conduction. Further, by inserting nothing into the jack 66, the telephone device 11f can be used as a function of the NAM microphone 21 only. In the example of FIG. 10, the jack 66 is provided in the NAM microphone 21, but the present invention is not limited to this. For example, the jack 66 may be provided in the band unit 23 or the protection unit 24.

  Further, in the present embodiment, the NAM microphone 21 and bones described above are applied to the earmuffs and headphones having a size that covers the ears of the user 40 for the purpose of blocking the surrounding sounds when the surrounding noise is large. One or both of the conductive speakers 22 may be embedded.

  As described above, according to the present invention, sound leakage to the surroundings during a call can be reduced. Specifically, on the voice transmission side of the call device, for example, recording of the body-conducted voice using a NAM microphone or the like enables a call with a very small whisper. As a result, the volume of the voice itself can be drastically reduced from that of a normal utterance. Furthermore, according to this embodiment, sound leakage to the surroundings can be reduced as much as possible by using a mask that covers part or all of the user's mouth.

  Further, by using the statistical voice enhancement process, the clarity and naturalness of the voice recorded by the NAM microphone can be enhanced, and a smoother call can be made.

  Also, on the voice receiving side of the communication device, for example, by using a bone conduction speaker, it is possible to listen to the transmitted voice without blocking both ears, so that it is possible to listen to surrounding sounds even during listening.

  Note that the communication device according to the present embodiment described above is not limited to the studio, and can be applied to various scenes in the broadcasting industry such as live broadcasts and field reports. Further, the present invention can be applied not only to the broadcasting industry but also to situations where, for example, a call in a crowd or a call with high confidentiality is required.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be changed.

DESCRIPTION OF SYMBOLS 10 Call system 11 Call apparatus 12 Sub-adjustment room 13 Communication network 14 Studio 21 NAM microphone (voice input part)
22 Bone conduction speaker (bone conduction output part)
23 Band part 24 Protection part 31 Signal processing part 32 Transmission part 33 Reception part 34 Signal conversion part 40 User 51 Soft silicon part 52 Vibration sensor 53 Electrode 54 Sound insulation cover 61 Earphone 62 Cable 63 Ear hook part 64 Mask 65 Plug (male terminal) )
66 Jack (female terminal)

Claims (6)

A voice input unit that collects non-audible murmurs, including murmured body conduction sounds that do not involve vocal cord vibrations;
A transmission unit for transmitting an audio signal obtained by the audio input unit;
A receiving unit for receiving an external audio signal;
A communication apparatus comprising: a bone conduction output unit that outputs a voice signal obtained by the receiving unit through bone conduction.   The call device according to claim 1, further comprising a signal processing unit that performs signal processing to increase a recognition rate of a non-audible murmur obtained by the voice input unit.   The communication device according to claim 1, further comprising a mask that covers a part or the whole of a user's mouth. The bone conduction output unit is
The communication device according to any one of claims 1 to 3, wherein the communication device has an earphone shape or an ear hook for attaching the bone conduction output unit to a predetermined position of a user.   The communication device according to any one of claims 1 to 4, wherein the bone conduction output unit is configured to be detachable.   The call device according to any one of claims 1 to 5, wherein the call device is used in a studio in which a program is recorded.

Images