WO2019038916A1

WO2019038916A1 - Mobile loudspeaker

Info

Publication number: WO2019038916A1
Application number: PCT/JP2017/030554
Authority: WO
Inventors: 萌丸岡; 和明平川
Original assignee: ヤマハ株式会社
Priority date: 2017-08-25
Filing date: 2017-08-25
Publication date: 2019-02-28

Abstract

This mobile loudspeaker is provided with: a loudspeaker unit; a housing section for housing the loudspeaker unit; and an attaching section. The attaching section makes it possible to attach and remove the housing section to and from a seat, seat belt or shoulder belt.

Description

Mobile speaker

One embodiment of the invention relates to a mobile speaker.

In a vehicle such as a car, the speaker is often fixed at a location (for example, a door or the like) to be a wall surface in the room. Therefore, there is a problem that the sound from the speaker is difficult for the passenger to hear. With respect to such a problem, there has been proposed a headrest (for example, see Patent Document 1) incorporating a speaker and a technology (for example, Patent Document 2) in which speakers are disposed on the left and right of the existing headrest.

JP, 2005-058287, A JP, 2005-167378, A

However, in the prior art which arranges a speaker in a headrest, a speaker is being fixed to a headrest in each case. Therefore, for a child whose seat height is lower than that of an adult, the position of the ear is separated from the speaker, so that it is difficult to hear the sound from the speaker.

Furthermore, in recent years, it has been desired to provide children with a comfortable in-vehicle environment. For example, when a child cries in a car, the child can be reassured by having the child listen to the mother's voice through the speaker. However, if a speaker is placed at a position away from the child's ear, the child may misunderstand that the mother is far away, even if the mother's voice is emitted from the speaker, and the child may be relieved. I can not

Accordingly, it is an object of at least one embodiment of the present invention to provide a technique for removably installing a speaker near a user's ear.

A mobile speaker according to an embodiment of the present invention includes a speaker unit, a storage unit for storing the speaker unit, and an attachment unit. The mounting portion enables the attachment and detachment of the storage portion to the seat, the seat belt, or the shoulder belt.

According to at least one embodiment of the present invention, the speaker can be removably installed at a position close to the user's ear.

It is the (A) top view, the (B) bottom view, and the (C) side view which showed the mobile speaker concerning a 1st embodiment. (A) and (B) are figures which showed the attachment state of the mobile speaker to a seat belt. It is a conceptual diagram showing a modification of an attaching part. (A) (B) It is the conceptual diagram which showed the state which rotated the storage case. It is the (A) front view and the (B) back view which showed the mobile speaker which concerns on 2nd Embodiment. (A) (B) It is the figure which showed the attachment state of the mobile speaker to a child seat. It is the conceptual diagram which showed the state which took out the speaker unit from the storage cushion. (A)-(D) are conceptual diagrams showing modifications of the storage cushion. It is a side view showing a modification of a mobile speaker. It is a conceptual diagram showing the state in the car where an acoustic system is built. It is a block diagram showing composition of a head unit with which an acoustic system is provided. It is a block diagram showing composition of a speaker (including a mobile speaker) with which an acoustic system is provided. It is the conceptual diagram which showed the condition in the case in which the users talk in the vehicle using the mobile speaker provided with a microphone unit. It is the flowchart which showed the communication processing performed with a mobile speaker and a head unit at the time of conversation.

[1] Configuration of Mobile Speaker [1-1] First Embodiment FIGS. 1A to 1C are a plan view, a bottom view, and a side view showing a mobile speaker 3M according to the first embodiment, respectively. is there. FIGS. 2A and 2B are diagrams showing the attachment of the mobile speaker 3M to the seat belt 101. FIG. As shown in FIGS. 1A to 1C, the mobile speaker 3M includes a clip 31, a storage case 32, a speaker unit 33, and an operation switch 34. The clip 31 and the storage case 32 correspond to the “attachment portion” and the “storage portion” described in the claims, respectively.

The clip 31 enables attachment and detachment of the storage case 32 to the seat belt 101 (see FIG. 2A), and has a structure for sandwiching the seat belt 101. In the present embodiment, the inner surface of the clip 31 is provided with a claw portion 31a which is hooked on the seat belt 101 when the seat belt 101 is pinched (see FIG. 1C). The seat belt 101 to which the storage case 32 is to be attached is not limited to the one provided as standard on automobiles, but may be a child seat seat belt. Moreover, the attachment object of the storage case 32 is not limited to the seat belt 101, but may be a shoulder belt such as a land cell.

Furthermore, in place of the clip 31, the mobile speaker 3M may be provided with another attachment portion that allows the storage case 32 to be attached to and detached from the seat belt 101 and a belt such as a shoulder belt. FIG. 3 is a conceptual view showing a modification of the mounting portion. As shown in FIG. 3, the mounting portion is composed of a sheet-like base material 311 which is folded to sandwich the belt, and a button 312 which connects the ends of the sheet base while sandwiching the belt. It is also good.

Further, in the present embodiment, the clip 31 is rotatably provided in the storage case 32. As a result, as shown in FIGS. 4A and 4B, the storage case 32 can be rotated in a state where the mobile speaker 3M is attached to the belt such as the seat belt 101. As a rotation mechanism that enables such rotation, a mechanism for rotating the clip 31 continuously, a mechanism for rotating the clip 31 intermittently (for example, one with a click feeling), etc. may be applied. it can.

The storage case 32 is a case for storing the speaker unit 33 (see FIG. 1C). In the present embodiment, the storage case 32 has a dome shape and has a shape in which a ladybug is imaged. The storage case 32 is colored (for example, red or yellow) in accordance with the image of the ladybug. The shape of the storage case 32 is not limited to the dome shape, and can be appropriately changed according to the image of an insect, an animal, a character or the like to be expressed by the appearance of the mobile speaker 3M. Further, the color of the storage case 32 may be a color matched to the image of an insect, an animal, a character or the like, or may be a color different from the image (such as blue or purple).

The storage case 32 is preferably a case whose surface is soft, such as one in which the surface of a plastic case is covered with a cushioning material. That is, it is preferable that the mobile speaker 3M further include a cushion connected to the storage case 32. According to the case with a soft surface, the touch and feel are improved, and a gentle image can be given to the user. Therefore, when the user is a child, the child can be given a sense of security. In addition, various materials, such as a cloth material, a rubber material, a resin material (silicone etc.), a satin material, a sponge material, a foam material, a shock absorbing material, etc. can be used for a cushion material. The cushion connected to the storage case 32 is not limited to the cushion material covering the surface of the storage case 32, and can be appropriately deformed into various shapes. In addition, the storage case 32 may be a case having a hard surface such as a plastic case (plastic case or the like). The texture of the surface of the storage case 32 can be appropriately changed according to the age of the target user.

Furthermore, the storage case 32 has a sound release unit 32 a that is acoustically opened, and the sound release unit 32 a is directed outward with respect to the storage case 32. In the present embodiment, a sound output unit 32 a is provided on a part of the side surface of the storage case 32. Therefore, the sound emitting unit 32a can be directed in a desired direction by rotating the storage case 32 in a state where the mobile speaker 3M is attached to a belt such as the seat belt 101 or the like. For example, as shown in FIG. 2 (B), it can be directed toward the user.

In addition, a cover 32b such as punching metal or saran net is disposed in the sound emitting portion 32a. And black is given to the cover 32b and the head of a ladybug is imaged. The position of the sound emitting unit 32a can be appropriately changed in accordance with the image of an insect, an animal, a character or the like to be expressed by the appearance of the mobile speaker 3M. Further, the color of the cover 32b may be a color matched to an image of an insect, an animal, a character or the like, or may be a color different from the image (such as blue or purple).

In the present embodiment, the speaker unit 33 is disposed in the storage case 32 in a posture directed to the sound emitting unit 32a (see FIG. 1C). The posture of the speaker unit 33 is not limited to this, and can be appropriately changed to an upward posture or the like. The number of the speaker units 33 is not limited to one, and a plurality of the speaker units 33 may be stored in the storage case 32. In this case, a plurality of sound emitting units 32 a may be provided in the storage case 32 in accordance with the respective directions of the speaker units 33.

An operation switch 34 is provided on the surface of the storage case 32. In the present embodiment, a plurality of operation switches 34 are provided on the surface of the storage case 32 and black is given to them, in an image of spots on the back of the ladybug. In addition, the operation switch 34 is provided in the area of the surface of the storage case 32 opposite to the area where the sound emitting portion 32 a is formed.

Therefore, with the mobile speaker 3M attached to a belt such as the seat belt 101, when the storage case 32 is directed toward the user (see FIG. 2B), the operation switch 34 is disposed at a position far from the user Ru. As a result, when viewed from the user side, the operation switch 34 is hidden behind the storage case 32, so that it becomes difficult for the user to touch the operation switch 34. As a result, the erroneous operation of the operation switch 34 is prevented. When an image of an insect, an animal, a character or the like is displayed on the appearance of the mobile speaker 3M, especially if the user is a child, the user tries to touch the mobile speaker 3M without intention to operate the operation switch 34. Even in such a case, the operation switch 34 is hidden behind the storage case 32, thereby preventing an erroneous operation of the operation switch 34 by a child.

From the viewpoint of preventing the erroneous operation of the operation switch 34, the pressing force required to turn on the operation switch 34 may be strengthened. In addition, the necessary pressing force may be increased for the operation switch 34 that the child does not want to operate, and the necessary pressing force may be reduced for the operation switch 34 that allows the child to operate.

According to the mobile speaker 3M of the present embodiment, the mobile speaker 3M can be attached at a position close to the user's ear by sandwiching the belt such as the seat belt 101 with the clip 31 (see FIG. 2B). Further, by rotating the storage case 32 to direct the sound output portion 32a toward the user in the attached state of the mobile speaker 3M, it becomes easy for the sound to reach only the user who uses the mobile speaker 3M. Therefore, the user can listen to the sound even if the volume is small. Also, by reducing the volume, sound leakage can be reduced without reducing the user's ease of hearing the sound. By thus reducing the sound leakage, each user can enjoy the sound while preventing the sound leakage to other users, even when a plurality of users using the mobile speaker 3M listen to different sounds. it can. The mobile speaker 3M has a function of automatically detecting an optimal orientation (for example, an orientation in which the sound quality is optimal) when directing the sound output unit 32a to the user, and notifying the user with light or sound. It may be

In addition, the following usage is also possible. For example, when a child cries in a car, by letting the child listen to the mother's voice through the mobile speaker 3M, the child can be made to think that the mother is speaking to him at the ear, which makes the child feel at ease be able to.

Furthermore, since the mobile speaker 3M of the present embodiment is attachable to and detachable from the belt such as the seat belt 101, the mobile speaker 3M can be removed from the belt and carried out, for example, even when getting off from a vehicle such as a car. The mobile speaker 3M can be removed from the belt and held by the child even if the user likes the mobile speaker 3M in the form of insects, animals, characters or the like, especially when the user is a child. .

[1-2] Second Embodiment FIGS. 5A and 5B are a front view and a rear view showing a mobile speaker 3M according to a second embodiment, respectively. 6 (A) and 6 (B) are diagrams showing the mounting state of the mobile speaker 3M on the child seat 102. FIG. As shown in FIGS. 5A and 5B, the mobile speaker 3M includes a storage cushion 35 and a speaker unit 36.

The storage cushion 35 is a cushion-like case for storing the speaker unit 36. As the cushion material constituting the storage cushion 35, various materials such as cloth material, rubber material, resin material (silicone etc.), satin material, sponge material, foam material, shock absorbing material and the like can be used. Also, the storage cushion 35 may be stuffed with cotton like a stuffed toy. In the present embodiment, the storage cushion 35 has a shape in which a frog is imaged. The storage cushion 35 is colored (for example, green or yellow) in accordance with the image of the frog. The storage cushion 35 has a body 351 in which a torso of a frog is imaged, two arm portions 352 in which an image of a frog arm is imaged, and two tip portions 353 in which a frog hand is imaged. (See FIG. 5 (A)).

In addition, the shape of the storage cushion 35 can be suitably changed according to the image of an insect, an animal, a character, etc. which it is going to express with the appearance of the mobile speaker 3M not only the shape which imagined a frog. Further, the color of the storage cushion 35 may be a color matched to an image of an insect, an animal, a character or the like, or may be a color different from the image (such as blue or purple). Furthermore, the storage cushion 35 may have a shape (see FIG. 8A) attached to the child seat 102 or the like to enable protection of the neck and head and the like, or a shape such as a pillow ( It may be FIG. 8 (B)), and can be suitably changed according to the function given to the storage cushion 35.

Furthermore, on the back surface of the storage cushion 35, there is provided a mounting portion 37 that enables the storage cushion 35 to be attached to and detached from a seat belt (for example, a buckle of a four-point seat belt) provided on the child seat 102 (see FIG. 5 (B)). In the present embodiment, the mounting portion 37 is configured of a sheet-like base 371 and a Velcro (registered trademark) 372. Specifically, one end of the sheet-like substrate 371 is sewn to the back of the storage cushion 35, and Velcro (registered trademark) 372 is attached to the other end. Then, the storage cushion 35 is attached to the seat belt by affixing Velcro (registered trademark) 372 to the rear surface of the storage cushion 35 while sandwiching the seat belt between the rear surface of the storage cushion 35 and the sheet-like base 371. (See FIG. 6 (B)).

The storage cushion 35 is not limited to one attached to the seat belt, but may be attached directly to the child seat 102 using Velcro (registered trademark) or the like as shown in FIGS. 8 (C) and 8 (D), for example. It may be In addition, the storage cushion 35 is not limited to one formed entirely of the cushion material, but may be formed only of a part of the storage cushion 35 such as the body 351 or the like. Moreover, the attachment object of the storage cushion 35 may be attached to various places which are not limited to the child seat 102.

In the present embodiment, the speaker unit 36 is two earphones, and is connected by a wiring cord to a main body 361 on which a wireless communication unit 301 and a CPU 302 (FIG. 12) described later are disposed (see FIG. 5A). ). Then, with the main body 361 housed in the trunk portion 351 of the storage cushion 35 and the wiring cord passed through the two arm portions 352, the speaker unit 36 is housed one by one in the two tip portions 353. According to such a mobile speaker 3M, a child can hear a sound by respectively applying two tip parts 353 in which a frog hand is imaged to both ears (see FIG. 6A).

As described above, according to the mobile speaker 3M of the present embodiment, the speaker unit 36 can be disposed at a position close to the user's ear. The same applies to the modifications shown in FIGS. 8A to 8D. Therefore, as in the first embodiment, the sound can easily reach only the user who uses the mobile speaker 3M. The main body 361 may be provided with a speaker unit different from the speaker unit 36. As a result, it is possible to output from the speaker unit of the main body 361 the sound that the user wants to hear around while outputting the sound that the child wants to hear from the speaker unit 36.

Furthermore, since the mobile speaker 3M of the present embodiment is attachable to and detachable from the child seat 102, the mobile speaker 3M can be removed from the child seat 102 and taken out, for example, even when getting off from a vehicle such as a car. Therefore, even when the child likes the mobile speaker 3M in the form of an insect, an animal, a character or the like and does not want to release it, the mobile speaker 3M can be removed from the child seat 102 and held by the child.

Further, in the present embodiment, as shown in FIG. 7, the storage cushion 35 is formed with an inlet 35 a which allows the speaker unit 36 to be taken in and out. That is, the storage cushion 35 has a structure in which the speaker unit 36 can be taken in and out. Therefore, the user can replace the storage cushion 35 with another one for the same speaker unit 36 (that is, change the storage cushion 35).

According to the changing of the storage cushion 35, the storage cushion 35 can be replaced according to the age of the child. For example, when the child is a 0-year-old child, the storage cushion 35 is preferably formed of a natural material, a water-repellent material, an antibacterial material, or a washable material that is safe for children to give up. When the child is a one-year-old child, the storage cushion 35 is preferably made of a material that produces a specific sound (a sound that the child is interested in) when the child touches it. When the child is a two-year-old child, it is preferable to be formed of a material (for example, silk material etc.) that is good for the child to feel.

Furthermore, according to the changing of the storage cushion 35, the sound quality can be changed by changing the storage cushion 35 to one formed of a sound absorbing material that absorbs a sound (for example, high sound) in a predetermined frequency range. it can.

[1-3] Modified Example FIG. 9 is a side view showing a modified example of the mobile speaker 3M according to the first embodiment. As shown in FIG. 9, the mobile speaker 3M may further include a microphone unit 38. Thereby, as will be described later, it is possible to enjoy conversations between users who use the mobile speaker 3M. In addition, artificial intelligence or the like can recognize speech input from the microphone unit 38, and an output according to the recognition result can be returned to the user via the speaker unit 33. Similarly, the mobile speaker 3M according to the second embodiment may also include the microphone unit 38.

In the above embodiment, the mobile speaker 3M propagates the sound from the speaker unit to the user's ear by using air as a medium, but the invention is not limited thereto. , And the user may be made to hear a sound by bone conduction. Note that the speaker unit is not limited to one that allows the user to hear the sound by bone conduction, and can be changed to various units that can output sound, such as highly directional ones and headphones.

Furthermore, a battery may be mounted on the mobile speaker 3M. In this case, the mobile speaker 3M may have a function of charging another device (for example, a smartphone or the like) using its own battery.

The mobile speaker 3M may have a function of guiding the user to sleep. As such a function, for example, there is a function of emitting light, sound, smell or the like which induces sleep. In addition, the mobile speaker 3M may have a function of sensing the stress of the user and emitting light, sound, smell or the like according to the degree of the stress.

The mobile speaker 3M may have a function of preventing the driver from falling asleep. For example, when the driver's condition is monitored by a camera or a living body sensor and it is detected that the driver feels sleepy, the mobile speaker 3M can issue a warning to the driver with light or sound. In addition, the mobile speaker 3M may have a function of emitting light, sound, smell or the like for removing sleepiness from the driver.

[2] Configuration of Sound System FIG. 10 is a conceptual view showing a state in the car where the sound system is constructed. As an example, FIG. 10 shows an interior of a vehicle in which three rows of seats are disposed. Each seat is provided with a seat belt (not shown). In addition, the child seat 102 can be installed on the front passenger seat and the rear seat using a seat belt.

In the car, a head unit 1 and a monitor 2 are disposed. In the example of FIG. 10, the head unit 1 is disposed at the front center of the vehicle. In addition, the arrangement position of the head unit 1 can be suitably changed according to the structure inside a vehicle, an environment, etc. not only this. The head unit 1 is an example of an acoustic unit mounted on a vehicle such as a car. Then, an acoustic system is constructed by such an acoustic unit and the speaker 3 (including the mobile speaker 3M) to which the audio signal is supplied from the acoustic unit (see FIG. 11). The speaker 3 includes, in addition to the mobile speaker 3M, a speaker fixed in the car (hereinafter, referred to as "fixed speaker").

[2-1] Configuration of Head Unit FIG. 11 is a block diagram showing the configuration of the head unit 1. As shown in FIG. 11, the head unit 1 includes a wireless communication unit 11, an input interface 12 A, an output interface 12 B, a sound source 13, a CPU 14, a ROM 15, a RAM 16, a mixer 17 and a DSP 18. Are connected to each other. The monitor 2 is connected to the output interface 12 B of the head unit 1.

The wireless communication unit 11 transmits an audio signal to the speaker 3 by connecting to the speaker 3 (including the mobile speaker 3M) by wireless communication. For example, Bluetooth (registered trademark), infrared communication, a wireless LAN or the like is used as a wireless communication method. The wireless communication scheme is not limited to these. The communication between the head unit 1 and the speaker 3 is not limited to wireless communication, and may be wired communication using an audio cable or the like.

The input interface 12A is an interface used to input an audio signal to the head unit 1. The input interface 12A is disposed, for example, next to each seat in the car and connected to the input terminal. A microphone, an information processing apparatus (tablet terminal or smartphone, etc.), a portable game machine, or an educational toy (tablet type toy) equipped with an audio signal output terminal, etc. is connected to the input terminal. An audio signal is input to the head unit 1 through the input terminal and the input interface 12A.

The sound source 13 has a plurality of audio sources. Specifically, the sound source 13 includes, for example, an FM tuner, an AM tuner, a CD player, an MD player, a magnetic cassette deck, an AUX terminal, a DVD player, a hard disk drive, or a TV tuner as an audio source.

The CPU 14 centrally controls the head unit 1 by reading a program stored in the ROM 15 (storage medium) into the RAM 16 and executing the program.

For example, the CPU 14 inputs the audio signal output from the sound source 13 and the audio signal input from the input interface 12A to the mixer 17. The mixer 17 mixes the two input audio signals. Then, the CPU 14 inputs the audio signal mixed by the mixer 17 to the DSP 18.

The DSP 18 is an example of a signal processing unit that adjusts the volume or sound quality of the input audio signal. The sound quality adjustment is performed, for example, by adjustment processing of frequency characteristics or noise cancellation processing. The DSP 18 outputs the audio signal after the sound quality adjustment to the wireless communication unit 11. The CPU 14 outputs an audio signal to the speaker 3 (including the mobile speaker 3M) via the wireless communication unit 11.

As an example of use of the head unit 1, the user reproduces movie content with a DVD player included in the sound source 13. In this case, the head unit 1 transmits reproduced sound from the wireless communication unit 11 to the speaker 3 while displaying the reproduced video on the monitor 2. Thereby, the user can listen to the reproduced sound output from the speaker 3.

[2-2] Configuration of Speaker FIG. 12 is a block diagram showing the configuration of the speaker 3 (including the mobile speaker 3M). As shown in FIG. 12, the speaker 3 includes a wireless communication unit 301, a CPU 302, a ROM 303, a RAM 304, a DSP 305, a converter 306, an amplifier 307, and a speaker unit 308 (

speaker unit

33 or 36 in the case of the mobile speaker 3M). These are connected to one another via a bus 309. The mobile speaker 3M shown in FIG. 9 further includes a microphone unit 38.

The wireless communication unit 301 receives an audio signal from the head unit 1 by connecting to the head unit 1 by wireless communication. For example, Bluetooth (registered trademark), infrared communication, a wireless LAN or the like is used as a wireless communication method. In the case of wireless communication, it is preferable that the light receiving element for communication is disposed at a position where communication interruption is unlikely to occur. In the case of the mobile speaker 3M, the light receiving element is a surface of the storage case 32 (specifically, the opposite side to the clip 31) so that communication interruption does not occur due to a substrate or the like on which the CPU 302 etc. are mounted. Is preferably disposed on the surface of The communication between the head unit 1 and the speaker 3 is not limited to wireless communication, and may be wired communication using an audio cable or the like.

The CPU 302 comprehensively controls the speaker 3 by reading a program stored in the ROM 303 (storage medium) to the RAM 304 and executing the program.

For example, the CPU 302 inputs an audio signal received from the head unit 1 via the wireless communication unit 301 to the DSP 305. The DSP 305 performs predetermined signal processing on the input audio signal and outputs the processed signal to the converter 306.

The converter 306 converts the input audio signal from a digital signal into an analog signal, and outputs the converted audio signal (analog signal) to the amplifier 307. The amplifier 307 amplifies the input analog signal and outputs it to the speaker unit 308. The speaker unit 308 outputs a sound based on the input analog signal. In the sound system, the head unit 1 may include a power amplifier instead of the speaker 3 including the amplifier 307.

[1-3] Various Processes in Sound System In the above-described sound system, various processes described below may be executed.

(1) Communication Processing FIG. 13 is a conceptual view showing the situation in the vehicle when users have a conversation in the vehicle using the mobile speaker 3M provided with the microphone unit 38. As shown in FIG. FIG. 14 is a flowchart showing communication processing executed by the mobile speaker 3M and the head unit 1 at the time of conversation. Note that FIG. 13 shows a situation in which the users sitting in the driver's seat and the back seat have a conversation.

When the microphone unit 38 acquires the user's voice (step S11), the mobile speaker 3M outputs an audio signal related to the acquired voice in the microphone unit 38 from the wireless communication unit 301 to the head unit 1 (step S12).

When the head unit 1 receives an audio signal from the mobile speaker 3M (step S21), the head unit 1 transmits the received audio signal to another mobile speaker 3M (step S22).

When the other mobile speaker 3M receives the audio signal from the head unit 1 (step S31), the other mobile speaker 3M outputs the sound based on the received audio signal from the speaker unit 33 or 36 (step S32).

According to such communication processing, even if users are separated from each other, conversation can be performed. Also, in a situation where the mother sits in the driver's seat and the child sits in the rear seat, the mother and the child can talk with each other through the mobile speaker 3M. For example, if the child is an infant and the child begins to cry in the car, the mother can talk to the child through the mobile speaker 3M. This makes it possible for the child to think that the mother is speaking to him at his ear, and can relieve the child.

In such a communication process, the head unit 1 or the mobile speaker 3M may perform a process of extracting only the conversational sound from the sound input to the microphone unit 38. This makes it easier for the users to hear each other's conversations.

Also, the head unit 1 or the mobile speaker 3M may have a voice change function of converting the sound input to the microphone unit 38 into the voice of another person. By using this function, even if the person who talks to the child through the mobile speaker 3M is not the mother, it is possible to make the child listen to the mother's voice and reassure the child.

Furthermore, as communication processing, the user may be notified via the mobile speaker 3M of not only conversation but also a response when an earthquake or a tsunami occurs or a situation when an on-vehicle vandalism or theft occurs.

(2) Signal Processing An example of signal processing (optimization processing) that can be executed in the acoustic system will be described. For example, since the driver's seat and the front passenger's seat are close to the engine of a car, it may be difficult for the user sitting there to hear the sound even if the mobile speaker 3M is disposed near the ear. Therefore, the head unit 1 may adjust the frequency characteristic of the sound according to the frequency characteristic of the engine sound so that the sound from the mobile speaker 3M is not masked by the engine sound. For example, when the level of the engine sound is high in the high sound area (for example, 4 kHz or more), the head unit 1 raises the level of the high sound to such a height that masking by the engine sound can be avoided.

In the rear seat, although the influence of the engine noise is reduced, the influence of disturbance noise such as road noise may occur. Therefore, the head unit 1 may adjust the frequency characteristic of the sound according to the frequency characteristic of the disturbance sound so that the sound from the mobile speaker 3M is not masked by the disturbance sound. For example, when the level of the disturbance sound is high in the middle sound area (for example, 500 to 4 kHz or more), the head unit 1 raises the level of the middle sound to such a height that masking by the disturbance sound can be avoided.

The head unit 1 may acquire position information of the mobile speaker 3M, and may adjust the volume balance or the frequency characteristic of the audio signal supplied to the mobile speaker 3M based on the position information.

The position (position information) of the mobile speaker 3M can be measured, for example, using a microphone unit 38 provided in the mobile speaker 3M and a fixed speaker (not shown) provided in the car.

Specifically, the head unit 1 outputs a measurement sound from each fixed speaker, and records the time when the measurement sound is output. The mobile speaker 3 </ b> M acquires the measurement sound by the microphone unit 38 and transmits the time when the measurement sound is acquired to the head unit 1. The head unit 1 calculates a time difference from when the measurement sound is output to when the microphone unit 38 acquires the measurement sound, and calculates the distance between each fixed speaker and the mobile speaker 3M from the time difference. Then, the head unit 1 calculates the position of the mobile speaker 3M based on the distance to the mobile speaker 3M calculated using at least three fixed speakers.

The frequency characteristics such as the engine sound and the disturbance sound may be measured in advance at each seat or may be obtained by acquiring an actual sound with the microphone unit 38. Further, the head unit 1 may estimate the frequency characteristic according to the engine speed or the vehicle speed. In this case, the head unit 1 is connected to an on-board diagnostics (OBD) connector of the vehicle, and acquires information on the engine speed or the vehicle speed. Furthermore, the head unit 1 may store the estimated frequency characteristic in association with information on the engine rotational speed or the vehicle speed in a storage medium such as the ROM 15, and may use the frequency characteristic stored in the storage medium.

The head unit 1 may automatically adjust the volume according to cases such as when the window of the vehicle is opened, when the door is opened, when the engine is stopped, or when the engine is started, etc. . Also, different adjustments may be made for each of the seats. Furthermore, the signal processing described above is not limited to the head unit 1 and may be performed by the mobile speaker 3M (for example, the DSP 305).

(3) Virtual Localization Process The following virtual localization process may be executed in the acoustic system. Here, the virtual localization process is performed using a head-related transfer function (HRTF) that is a transfer function between the sound source position and the listener's ear. Specifically, the head-related transfer function is an impulse response function that expresses the magnitude of sound from the virtual speaker installed at a certain position to the left and right ears, the arrival time, the frequency characteristic, and the like. In the present embodiment, by executing the virtual localization process, the sound image can be virtually localized at a predetermined position around the user who uses the mobile speaker 3M. For example, when the user views movie content, the video and the sound image can be superimposed by adding a head-related transfer function from the position of the monitor 2 to the left and right ears to the audio signal of the center channel.

(4) Sound Masking Process In the sound system, the following masking process may be performed. The head unit 1 outputs a masking sound to a specific user (for example, a driver) who uses the mobile speaker 3M. It is preferable that the musk sound consists of a disturbing sound that disturbs the sound to be masked, a background sound that is generated continuously, and an effect sound that is generated intermittently. The disturbing sound is a sound for transforming human voice into a sound lexically meaningless on the time axis or on the frequency axis. The background sound is a sound that the user does not pay much attention to, such as, for example, a stream of a stream or a screeching of trees, and that the user does not feel uncomfortable. The effect sound is a sound with high effect such as a musical tone that is generated intermittently, and makes the listener pay attention to make the sense of incongruence of disturbed sound inconspicuous. By making the driver listen to such mascaras, it is possible to mask the conversation content of the rear seat user without giving the driver a sense of discomfort.

(5) Navigation Process The sound system may have a function as a navigation system. As an example, in an acoustic system, a CPU can function as an artificial intelligence (eg, a neural network) and cause the artificial intelligence to execute navigation. Artificial intelligence can recognize the input sound and can perform an output according to the recognition result. Such sound recognition and corresponding output are performed with high accuracy by machine learning, deep learning, and the like.

In the present embodiment, by using artificial intelligence, it is possible to recognize a voice input from the microphone unit 38 provided in the mobile speaker 3M and perform an output (for example, an answer to a question) according to the recognition result. For example, when the user voice-inputs "search for a nearby parking lot", artificial intelligence recognizes "near", "parking lot", "searching", etc., and according to the recognition result, for example, The location of the parking lot is notified to the user through the

speaker unit

33 or 36 by finding a nearby parking lot by network search or the like. At this time, the artificial intelligence acquires the current position from GPS or the like, and finds out a parking lot existing near the position. The artificial intelligence may also notify the location of the parking lot, the location of the parking lot to be notified, the time required for the parking lot, and so on.

The navigation is not limited to artificial intelligence, and various modifications are possible. For example, when the head unit 1 or the mobile speaker 3M has a function of connecting to a mobile communication network, the user receives some guidance from the call center by making a call to the call center using such a function. It is also good. When the head unit 1 or the mobile speaker 3M has a function of connecting to the Internet, the user may receive guidance from the site by accessing a predetermined site using such a function.

(6) Translation Process In the sound system, the following translation process may be executed. As an example, in an acoustic system, a CPU can function as an artificial intelligence (eg, a neural network) and cause the artificial intelligence to execute a translation. As described above, the artificial intelligence can recognize the input sound and perform an output according to the recognition result.

In this embodiment, by using artificial intelligence, the voice input from the microphone unit 38 provided in the mobile speaker 3M is recognized, the recognized voice (for example, Japanese) is analyzed, and another language (for example, English) is obtained. Translate to The translated sound is output from the

speaker unit

33 or 36 provided in the mobile speaker 3M.

The above-described translation process is not limited to the case of translating the voice input by the user, but can be applied to the case of translating the voice output in the above-described navigation process.

The above description of the embodiments should be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated not by the embodiments described above but by the claims. Further, the scope of the present invention is intended to include all modifications within the scope and meaning equivalent to the claims.

Reference Signs List 1 head unit 2 monitor 3 speaker 3 M mobile speaker 11 wireless communication unit 12 A input interface 12 B output interface 13 sound source 14 CPU
15 ROM
16 RAM
17 mixer 18 DSP
19 bus 31 clip 31a claw 32 storage case 32a sound emitting part 32b cover 33 speaker unit 34 operation switch 35 storage cushion 35a entrance 36 speaker unit 37 mounting part 38 microphone unit 101 seat belt 102 child seat 301 wireless communication part 302 CPU
303 ROM
304 RAM
305 DSP
306 converter 307 amplifier 308 speaker unit 309

bus

311, 371 sheet-like base material 312 button 351 body portion 352 arm portion 353 tip portion 361 main body

Claims

A speaker unit,
A storage unit for storing the speaker unit;
A mounting portion which allows the storage portion to be detached from the seat, the seat belt, or the shoulder belt;
, Mobile speaker.
The mobile speaker according to claim 1, wherein the attachment portion has a structure for sandwiching the seat belt or the shoulder belt.
The mobile speaker according to claim 1, wherein the attachment portion is rotatably provided in the storage portion.
The mobile speaker according to any one of claims 1 to 3, wherein the storage unit has a sound release unit that is acoustically opened, and the sound release unit is directed outward with respect to the storage unit. .
The mobile speaker according to any one of claims 1 to 4, wherein the storage portion includes a cushion.
The mobile speaker according to claim 5, wherein the cushion has a structure capable of inserting and removing the speaker unit.