WO2019038915A1 - Speaker for headrest - Google Patents

Speaker for headrest Download PDF

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Publication number
WO2019038915A1
WO2019038915A1 PCT/JP2017/030552 JP2017030552W WO2019038915A1 WO 2019038915 A1 WO2019038915 A1 WO 2019038915A1 JP 2017030552 W JP2017030552 W JP 2017030552W WO 2019038915 A1 WO2019038915 A1 WO 2019038915A1
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WO
WIPO (PCT)
Prior art keywords
speaker
sound
headrest
unit
user
Prior art date
Application number
PCT/JP2017/030552
Other languages
French (fr)
Japanese (ja)
Inventor
和明 平川
Original Assignee
ヤマハ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ株式会社 filed Critical ヤマハ株式会社
Priority to PCT/JP2017/030552 priority Critical patent/WO2019038915A1/en
Publication of WO2019038915A1 publication Critical patent/WO2019038915A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • Some embodiments of the present invention relate to a headrest speaker.
  • Patent Document 1 discloses a headrest incorporating a speaker.
  • Patent Document 2 discloses a structure for arranging speakers on the left and right of the existing headrest.
  • some embodiments of the present invention aim to provide a headrest speaker that can utilize an existing headrest without disturbing the user.
  • a headrest speaker includes a housing and a speaker unit.
  • the housing is attached to the post of the headrest in contact with the head.
  • the speaker unit is provided in the case.
  • Some embodiments of the present invention can utilize existing headrests without disturbing the user.
  • FIG. 2 is a block diagram showing the configuration of a head unit 1;
  • FIG. 2 is a block diagram showing the configuration of a speaker 3;
  • FIG. 6 is an exploded perspective view of a headrest 5FR, a seat 10FR, and a speaker 3.
  • FIG. 3 is a perspective view of the speaker 3;
  • FIG. 6A is a plan view in which a part of the housing 51 is transmitted, and
  • FIG. 6B is a plan view in which a part of the housing 51 is transmitted.
  • FIG. 7A and FIG. 7B are right side views in which a part of the housing 51 is transmitted, and
  • FIG. 7C is a partially transparent perspective view of the speaker 3.
  • FIGS. 8A and 8B are perspective views showing modifications of the housing.
  • FIG. 9A and FIG. 9B are perspective views of the speaker 3C according to the second embodiment.
  • FIG. 10A and FIG. 10B are perspective views of a loudspeaker 3D according to the third embodiment.
  • FIG. 11 is a plan view showing an in-vehicle state. It is a block diagram showing composition of speaker 3E. 5 is a flowchart showing operations of the speaker 3E and the head unit 1; As another example (application example 2) of processing of an audio signal, it is a typical top view in the car in the case of performing virtual localization processing.
  • FIG. 18 is a schematic plan view of the interior of a vehicle for illustrating signal processing according to Application Example 4;
  • FIG. 1 is a schematic plan view showing an in-vehicle state.
  • the head unit 1 and the monitor 20 are disposed in the vehicle.
  • FIG. 1 shows the interior of a vehicle in which three rows of seats are arranged, as an example.
  • a headrest 5FR and a headrest 5FL are attached to the front driver's seat 10FR and the front passenger's seat 10FL, respectively.
  • Three headrests 5C, a headrest 5CR, and a headrest 5CL are attached to the seat 10C in the second row.
  • three headrests 5R, a headrest 5RR, and a headrest 5RL are attached to the third row of seats 10R.
  • the head unit 1 is disposed at the front center of the vehicle. However, the placement position of the head unit 1 is not limited to the front center of the vehicle.
  • the head unit 1 is an example of an acoustic device mounted on a vehicle such as a car.
  • FIG. 2 is a block diagram showing the configuration of the head unit 1.
  • the head unit 1 includes a wireless communication unit 12, a CPU 14, a ROM 15, a RAM 16, a DSP 17, an input I / F 18, a sound source 19, a bus 200, a mixer 21, and an output I / F 22.
  • the wireless communication unit 12, the CPU 14, the ROM 15, the RAM 16, the DSP 17, the input I / F 18, the sound source 19, the mixer 21, and the output I / F 22 are connected via a bus 200. Further, a monitor 20 is connected to the output I / F 22.
  • the speaker 3 is wirelessly connected to the wireless communication unit 12.
  • the wireless communication may be any method, for example, Bluetooth (registered trademark), infrared communication, or wireless LAN.
  • the connection between the head unit 1 and the speaker 3 is not limited to wireless connection.
  • the head unit 1 and the speaker 3 may be connected, for example, via an audio cable.
  • the CPU 14 reads a program stored in the ROM 15 which is a storage medium into the RAM 16 and centrally controls the head unit 1.
  • the CPU 14 inputs an audio signal output from the sound source 19 to the mixer 21.
  • the CPU 14 also inputs an audio signal input from the input I / F 18 to the mixer 21.
  • the mixer 21 mixes the audio signal output from the sound source 19 with the audio signal input from the input I / F 18.
  • the CPU 14 inputs the audio signal mixed by the mixer 21 to the DSP 17.
  • An audio signal is input to the input I / F 18.
  • an input terminal is connected to the input I / F 18.
  • the input terminal is disposed, for example, next to each seat in the car.
  • a microphone, an information processing apparatus (a tablet terminal, a smartphone, or the like), a portable game machine, an educational toy (tablet toy) provided with an audio signal output terminal, or the like is connected to the input terminal.
  • the input I / F 18 receives an audio signal from 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. It is input.
  • the DSP 17 is an example of a signal processing unit.
  • the DSP 17 adjusts the volume or sound quality of the input audio signal.
  • the sound quality adjustment is, for example, adjustment of frequency characteristics or noise cancellation processing.
  • the DSP 17 outputs the audio signal after the sound quality adjustment to the wireless communication unit 12.
  • the CPU 14 outputs an audio signal to the speaker 3 via the wireless communication unit 12.
  • the sound source 19 has a plurality of audio sources.
  • the sound source 19 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 user plays movie content, for example, on a DVD player.
  • the head unit 1 transmits the reproduction sound of the movie content to the speaker 3 via the output I / F 22, and causes the speaker 3 to output the reproduction sound.
  • the user can also enjoy karaoke in the car by playing music with a CD player or the like and singing using a microphone.
  • the head unit 1 mixes the reproduced sound of the CD player with the singing sound input from the input I / F 18 and outputs the mixed sound to the speaker 3.
  • the monitor 20 is disposed in front of and in the center of the vehicle.
  • the monitor 20 displays, for example, an image reproduced by a DVD player.
  • FIG. 3 is a block diagram showing the configuration of the speaker 3.
  • FIG. 4 is an exploded perspective view of the headrest 5FR, the seat 10FR, and the speaker 3.
  • FIG. 5 is a perspective view of the speaker 3. Although FIG. 4 representatively shows that the speaker 3 is attached to the seat 10FR and the headrest 5FR, the speaker 3 is attached to other seats and the headrest in the same manner.
  • the speaker 3 includes a wireless communication unit 31, a CPU 32, a ROM 33, a RAM 34, a DSP 35, a D / A converter 36, an amplifier 37, a speaker unit 38, and a bus 300.
  • the wireless communication unit 31, the CPU 32, the ROM 33, the RAM 34, the DSP 35, the D / A converter 36, the amplifier 37, and the speaker unit 38 are connected via the bus 300.
  • the CPU 32 reads a program stored in the ROM 33, which is a storage medium, into the RAM 34, and centrally controls the speaker 3.
  • the CPU 32 inputs an audio signal received from the head unit 1 via the wireless communication unit 31 to the DSP 35.
  • the DSP 35 performs predetermined signal processing on the input audio signal and outputs the processed signal to the D / A converter 36.
  • the D / A converter 36 converts the input audio signal into an analog signal and outputs the analog signal to the amplifier 37.
  • the amplifier 37 amplifies the analog signal and outputs it to the speaker unit 38.
  • the speaker unit 38 outputs a sound based on the input analog signal.
  • the speaker 3 has a rectangular parallelepiped housing 51.
  • the housing 51 is short in the height direction and is sandwiched between the seat 10FR and the headrest 5FR.
  • the width in the left-right direction and the length in the front-rear direction of the housing 51 are substantially the same as the width and the length of the bottom surface of the headrest 5FR.
  • the width and the length of the housing 51 do not have to be strictly the same as the width and the length of the bottom of the headrest 5FR.
  • the housing 51 is provided with two holes 52 penetrating from the upper surface to the lower surface.
  • the two pillars 100 of the headrest 5FR are inserted into these two holes 52.
  • the housing 51 is sandwiched and fixed by the headrest 5FR and the seat 10FR.
  • FIG. 6A is a plan view in which a part of the housing 51 is transmitted.
  • FIG. 7A is a left side view in which a part of the housing 51 is transmitted.
  • the speaker unit 38 is disposed at the end of the inside of the housing 51 in the front direction (the downward direction in FIG. 6A, the left direction in FIG. 7A).
  • a punching metal, a saran net or the like is disposed and is acoustically open.
  • two speaker units 38 are disposed on the left and right of the housing 51.
  • the two speaker units 38 are disposed at positions where the left and right ears are pinched from the back of the head of the user. Therefore, the speaker unit 38 is in an ideal arrangement for the user to listen to the sound.
  • the number of speaker units 38 in the present invention is not limited to two.
  • the wireless communication unit 31 is provided at the front left and right ends of the inside of the housing 51. As described above, the wireless communication unit 31 uses Bluetooth (registered trademark), infrared communication, or a wireless LAN.
  • the head unit 1 is disposed in the front center of the vehicle.
  • the wireless communication unit 31 is preferably disposed at the left and right ends of the housing 51 so that the light receiving element is not blocked by the head or neck of the user when performing infrared communication.
  • the connection between the head unit 1 and the speaker 3 is not limited to wireless connection.
  • the head unit 1 and the speaker 3 may be connected by an analog audio cable.
  • a power amplifier may be incorporated in the head unit 1 and the amplified audio signal may be supplied to the speaker 3.
  • the speaker 3 does not need a power supply, and the wireless communication unit 31, the CPU 32, the ROM 33, the RAM 34, the DSP 35, the D / A converter 36, the amplifier 37, and the bus 300 are unnecessary.
  • the speaker 3 receives power supply from a built-in battery, a cigar socket in a car, a USB interface, or the like when power supply is required.
  • the speaker 3 may receive an audio signal from the rear monitor. In this case, the rear monitor is connected to the head unit 1, receives an audio signal from the head unit 1, and supplies an audio signal to the speaker 3.
  • the speaker 3 of this embodiment since the speaker 3 of this embodiment is attached to the headrest of each seat, it can output sound near the head and ear of each user.
  • the speaker fixed to the conventional door etc. is installed in the position far from a user's head and ear. Therefore, the speaker fixed to the conventional door etc. did not become a sound easy to be heard by the user if it did not output with a certain volume.
  • the speaker 3 according to the present embodiment outputs sound near the head and ear of each user, so that the user can easily listen to even a small volume. In addition, even when each user is listening to the sound of different content, each user can enjoy the sound while preventing the sound from leaking to other users.
  • the speaker 3 according to the present embodiment even when using a speaker unit having high heat resistance but low sound quality (for example, a speaker cone of a metal member) for installation in a car, the head of each user and The user can easily listen to the sound because the sound is output near the ear.
  • a speaker unit having high heat resistance but low sound quality for example, a speaker cone of a metal member
  • the band of the speech may overlap with the band of disturbance such as road noise.
  • the user often has the speech noise masked by disturbance noise such as road noise, which makes it difficult to hear.
  • the speaker 3 of this embodiment outputs sound near the head and ear of each user, the user can easily listen to the speech.
  • the sound of speech corresponds to the center channel in multi-channel audio. Therefore, in a sound system for movie theaters or general home theaters, the sound of speech is localized in the front center of the listener (that is, near the screen).
  • the speaker 3 of this embodiment emits a sound from the back of the user's head. It is difficult for a person to obtain a sense of stereotacticity for sounds from the rear and from the front. Therefore, it is difficult for the user to determine the sound source position of the speech by relying on the ear. In this case, the user relies on the vision to determine the sound source position of the speech. Therefore, in the speaker 3 of the present embodiment, the user perceives that the sound source is present at the mouth of the person displayed on the monitor 20. In particular, since the rear monitor is disposed at a predetermined distance in front of the viewer sitting in the rear seat (for example, about 50 to 70 cm), the perception of the sound source position based on such vision is more effectively exhibited.
  • the speaker 3 of the present embodiment is suitable for content that emits sound in synchronization with a video (particularly, a video of a person).
  • FIG. 6B is a plan view in which a part of the housing 51 is transmitted.
  • the speaker unit 38 is directed inward. In this manner, by arranging the speaker unit 38 inward, sound can be easily delivered only to the user sitting on the seat while reducing sound leakage.
  • FIG. 7B is a right side view in which a part of the housing 51 is transmitted.
  • the speaker unit 38 is directed obliquely upward. Since the pillars of the headrest are arranged near the neck of the user, by disposing the speaker unit 38 obliquely upward as shown in FIG. 7B, the sound leakage is further reduced while the sound leakage is reduced. The sound can be easily reached only to the user who is sitting at.
  • FIG. 7C is a partially transparent perspective view of the speaker 3.
  • the speaker unit 38 is directed inward and obliquely upward. Therefore, the sound can be easily delivered only to the user sitting on the seat, while further reducing the sound leakage.
  • the direction of the speaker unit 38 may be, for example, obliquely downward. If the user is a child, the position of the head and ears may be below the post of the headrest. In this case, since the direction of the speaker unit 38 is directed obliquely downward, it is easy for the sound to reach only the user sitting on the seat while reducing the sound leakage.
  • the speaker 3 of the present embodiment shows an example of transmitting the sound to the user through the space
  • the sound generated by the speaker unit 38 is transmitted to the user's head or neck or the like. Transmission is also possible.
  • the speaker unit 38 may be installed upward on the top surface of the housing 51.
  • the headrest 5FR vibrates by the sound output from the speaker unit 38.
  • the vibration of the headrest 5FR is transmitted to the head of the user, so that the sound can be transmitted by bone conduction.
  • the speaker unit 38 may be installed downward on the lower surface of the housing 51.
  • the sheet 10FR is vibrated by the sound output from the speaker unit 38.
  • a person can also feel the sound by the vibration transmitted to the body.
  • vibration transmitted to the body may be perceived as a better sound than the ear. Therefore, the user sitting on each sheet can enjoy better sound than before, while preventing the sound from leaking to other users.
  • the speaker 3 of this embodiment may be provided with a bone conduction actuator instead of the speaker unit 38 (or in addition to the speaker unit 38) in order to make a sound more effectively perceived by vibration.
  • FIG. 8A is a perspective view showing a modified example of the housing.
  • the speaker 3A shown in FIG. 8A includes a housing 51A.
  • the other configuration is the same as that of the speaker 3.
  • the housing 51A has a linear notch 31A in plan view.
  • the notch 31A is formed from the left side surface of the housing 51A toward the right side surface.
  • the pillar 100 of the headrest 5FR is fitted into the cutout 31A from the lateral direction.
  • a user makes height of headrest 5FR high, and inserts notch 31A of speaker 3 from the right side of headrest 5FR. Thereafter, the user clamps the speaker 3 with the headrest 5FR and the seat 10FR by lowering the height of the headrest 5FR. Thereby, the speaker 3 is fixed to the headrest 5FR and the seat 10FR.
  • pillar 100 may be provided in the notch part 31A.
  • the notch 31 ⁇ / b> A may be provided with a mechanical fixing mechanism for holding the support 100.
  • the notch 31A may be provided with a non-slip mechanism such as rubber.
  • the user can easily remove the speaker 3 by raising the height of the headrest 5FR and sliding the speaker 3 to the right.
  • the notch 31A may be formed from the right side surface of the housing 51A toward the left side surface.
  • FIG. 8B is a perspective view showing a modified example of the housing.
  • the speaker 3B shown in FIG. 8B includes a housing 51B.
  • the other configuration is the same as the speaker 3 and the speaker 3A.
  • the housing 51B has an L-shaped cutout 31B in plan view. Notch 31B has a portion formed forward from the rear side surface of housing 51A and a portion formed toward the right side. The post 100 of the headrest 5FR is fitted into the notch 31B.
  • pillar 100 may be provided also in the notch part 31B.
  • the notch 31 ⁇ / b> B may be provided with a mechanical fixing mechanism for holding the support 100.
  • a non-slip mechanism such as rubber may be provided in the notch portion 31B.
  • the user raises the height of the headrest 5FR, moves the speaker 3 forward, and removes the speaker 3 from the left support 100. Thereafter, the speaker 3 can be easily removed by sliding the speaker 3 to the right.
  • the shape of the headrest is determined for each vehicle type. Also, the width between the headrest struts may differ from vehicle type to vehicle type. However, in either example of FIG. 8 (A) and FIG. 8 (B), in order to insert a pillar in a notch and slide the speaker 3, even when the width between pillars 100 of a headrest differs for every vehicle type, it corresponds can do. Also, the user can attach or detach the speaker 3 without removing the headrest once.
  • FIGS. 9A and 9B are perspective views of a speaker 3C according to a second embodiment.
  • the speaker 3C is a headphone type speaker.
  • the speaker 3C includes a headband 51C sandwiching the headrest 5FR, and a speaker unit 38C attached inward toward the headrest FR at an end of the headband 51C.
  • the speaker unit 38C contacts the side surface of the headrest 5FR.
  • the headrest 5FR is vibrated by the sound output from the speaker unit 38C.
  • the vibration of the headrest 5FR is transmitted to the head of the user, so that the sound can be transmitted by bone conduction. Therefore, also in the second embodiment, the user sitting on each sheet can enjoy a better sound than before while preventing the sound from leaking to other users.
  • FIG. 10A and FIG. 10B are perspective views of a speaker 3D according to a third embodiment.
  • the speaker 3D includes a speaker unit 38FR and a reflector 39FR.
  • the speaker units 38FR are disposed outward on the left and right sides of the headrest 5FR.
  • the reflecting plate 39FR is disposed on the left and right side surfaces of the headrest, and is openable and closable about the rear left and right ends of the headrest.
  • the reflecting plate 39FR has a trapezoidal shape in a side view, and has a shape following the side shape of the headrest 5FR.
  • the side surface of the reflection plate 39FR is a flat plate, and as shown in FIG. 10B, when the reflection plate 39FR is closed, it has a shape integrated with the headrest 5FR.
  • the reflection plate 39FR When the reflection plate 39FR is opened, the inner side surface of the reflection plate 39FR faces the front. Therefore, the sound output from the speaker unit 38FR is reflected by the inner side surface of the reflecting plate 39FR and emitted forward. In this case, the user receives a sound from the outside of the above-described speaker 3 and a sound from the same height as the head. Also in this case, the user can experience a realistic sound.
  • the speaker unit 38FR since the speaker unit 38FR is disposed outward on the left and right side surfaces of the headrest 5FR, the speaker unit 38FR does not interfere with the buffer function as the headrest. Further, as shown in FIG. 10 (B), when the speaker is not used, the reflecting plate 39FR is closed, so it does not get in the way. In addition, when there is a sudden change in acceleration, such as an accident, there is no risk of collision with the passenger.
  • FIG. 11 is a plan view showing an in-vehicle state.
  • the same reference numerals as in FIG. 1 denote the same parts as in FIG.
  • FIG. 12 is a block diagram showing the configuration of the speaker 3E.
  • the same reference numerals as in FIG. 4 denote the same parts as in FIG.
  • FIG. 13 is a flowchart showing the operation of the speaker 3E and the head unit 1.
  • the speaker 3E further includes a microphone unit 39.
  • the microphone unit 39 acquires the voice of the user (S11).
  • the CPU 32 causes the wireless communication unit 31 to output an audio signal related to the sound acquired by the microphone unit 39.
  • a plurality of speakers 3E are connected to the head unit 1.
  • Each wireless communication unit 31 in the plurality of speakers 3E transmits an audio signal to the head unit 1 (S12).
  • the head unit 1 receives an audio signal (S21).
  • the head unit 1 transmits the received audio signal to another connected speaker 3E (S22).
  • the other speaker 3E receives the audio signal transmitted from the head unit 1 (S131).
  • the CPU 32 causes the speaker unit 38 to emit sound based on the audio signal received by the wireless communication unit 31 (S141).
  • the user's voice collected by a certain speaker 3E is emitted from the speaker unit 38 of the other speaker 3E. Therefore, in the example of FIG. 11, the user (driver) sitting on the seat 10FR in the driver's seat and the user sitting on the left side of the seat 10R on the rear seat can hear each other's speech, which is comfortable. Can have a good conversation.
  • the audio signal is transmitted and received between the plurality of speakers 3E via the head unit 1.
  • the audio signal may be transmitted and received directly between the plurality of speakers 3E.
  • the head unit 1 adjusts the frequency characteristic of the reproduced sound according to the frequency characteristic of the engine sound so that the reproduced sound 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 of the reproduction sound so that the high sound is not masked by the engine sound.
  • the engine noise may not be noticeable, but disturbance noise such as road noise may be noticeable.
  • the head unit 1 adjusts the frequency characteristic of the reproduced sound so that the reproduced sound is not masked by the disturbance sound according to the frequency characteristic of the disturbance sound such as road noise. 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 of the reproduction sound so that the middle sound is not masked by the disturbance sound.
  • the position where the speaker 3 is installed (that is, the position of the user) can be measured, for example, by using a microphone (the microphone unit 39 of the speaker 3E) and a speaker (not shown) fixed in the car.
  • the head unit 1 outputs a measurement sound from each speaker fixed in the car (hereinafter, referred to as fixed speaker).
  • the head unit 1 records the time when the measurement sound is output.
  • the microphone unit 39 acquires a measurement sound.
  • the speaker 3E records the time when the microphone unit 39 acquires the measurement sound.
  • the speaker 3E transmits, to the head unit 1, time information when the measurement sound is acquired.
  • the head unit 1 measures the distance between the fixed speaker and the speaker 3E from the time difference between the output of the measurement sound and the acquisition of the measurement sound by the microphone.
  • the head unit 1 outputs measurement sound from the plurality of fixed speakers, and repeats the measurement of the distance to measure the distance between the plurality of fixed speakers and the speaker 3E.
  • the head unit 1 can uniquely determine the position of the speaker 3E when the measurement is performed with the three fixed speakers.
  • the head unit 1 can measure the position (coordinates) of the speaker 3E in the car by plotting the arrangement of the fixed speakers in the car on a Cartesian coordinate system with the head unit 1 as an origin, for example.
  • the head unit 1 When the head unit 1 acquires position information, it adjusts the volume balance or frequency characteristics of the audio signal supplied to the speaker 3E based on the position information. For example, when the head unit 1 acquires position information to the effect that the speaker 3E is installed at the driver's seat, the head unit 1 adjusts the frequency characteristic such that the sound output from the speaker unit 38 is not masked by the engine sound.
  • the frequency characteristics of the engine sound and the disturbance sound may be measured in advance at each position such as the driver's seat and the front passenger seat, or even if the microphone unit 39 acquires an actual sound to acquire the frequency characteristic. Good.
  • the head unit 1 may estimate frequency characteristics according to the engine speed or the vehicle speed.
  • 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. Then, the head unit 1 stores the information on the engine rotational speed or the vehicle speed in advance in the storage medium such as the ROM 15 in association with the frequency characteristic of the noise sound.
  • the head unit 1 reads the frequency characteristic of the noise sound based on the acquired information on the current engine rotational speed or vehicle speed, and adjusts the frequency characteristic of the audio signal.
  • OBD on-board diagnostics
  • the head unit 1 automatically receives an input sound. It is also possible to set the volume down and mute different settings for each position.
  • the signal processing as described above can also be performed by the DSP 35 in the speaker 3 instead of the head unit 1.
  • FIG. 14 is a schematic plan view of the inside of a vehicle in the case of performing virtual localization processing as another example (application example 2) of audio signal processing.
  • the sound system according to the application example 2 performs a process of virtually localizing a sound image at a predetermined position around the listener in the head unit 1 or the speaker 3E.
  • the virtual localization is performed by head-related transfer function (HRTF).
  • the head-related transfer function indicates the transfer function between the sound source position and the listener's ear.
  • the head-related transfer function is an impulse response that expresses the magnitude, the arrival time, the frequency characteristic, and the like of the sound from the virtual speaker 38 installed at a certain position to each of the left and right ears.
  • the head unit 1 adds a head-related transfer function from the position of the monitor 20 to the left and right ears to the audio signal of the center channel when the user is watching the movie content.
  • the virtual localization by the head related transfer function is suitable when the user uses headphones.
  • the sound system according to the application example 3 performs a sound masking process in the head unit 1 or the speaker 3.
  • the head unit 1 outputs a masking sound to a specific user (for example, a driver) in the vehicle.
  • a specific user for example, a driver
  • the speaker 3 of the driver's seat outputs a masker sound that makes the content incomprehensible.
  • 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 disturbance sound is, for example, one in which human voice is modified on a time axis or a frequency axis so that it does not make any lexical meaning (the content can not be understood).
  • the background sound is a sound that is difficult for the listener to pay attention to, such as, for example, a stream of a stream or a sway of trees, and that there is no discomfort.
  • the effect sound is a sound with high effect such as musical tones generated intermittently.
  • the directing sound directs the listener's attention, and makes the sense of incongruence of disturbed sound inconspicuous in auditory-psychologically. By making the driver listen to the mascara sound combining the disturbing sound, the background sound, and the directing sound, it is possible to reduce the driver's discomfort while masking the conversation content of the user of the rear seat. .
  • a passenger such as a taxi can prevent the driver from hearing the conversation contents. Also, the driver's discomfort is reduced.
  • FIG. 15 is a schematic plan view of the interior of a vehicle for illustrating signal processing according to Application Example 4.
  • the signal processing according to the application example 4 reproduces a pseudo reflection sound 501 simulating a reflection sound generated in an acoustic space such as a concert hall, so that the user can be in a car but in another space such as an actual concert hall. It makes listeners feel the feeling.
  • the head unit 1 convolutes an impulse response corresponding to an acoustic space (for example, a concert hall) selected by the user into an audio signal.
  • the head unit 1 changes the gain ratio and the delay amount of the signal supplied to the plurality of vinegar speaker units 38 of each speaker 3 to generate the pseudo reflected sound 501 at a plurality of positions as shown in FIG.
  • the speaker 3 may have an illumination function such as an LED. In this case, the user can remove the speaker 3 and use it as outdoor lighting (for example, a lantern in a campsite). In addition, the speaker 3 may change the color or illuminance of illumination according to the audio source. For example, when playing an up-tempo song, the color of the illumination is set to be bright and high illumination.
  • the head unit 1 or the speaker 3E performs artificial intelligence (for example, neural network) processing by the CPU.
  • artificial intelligence for example, neural network
  • a neural network has a plurality of neurons, and each neuron outputs a predetermined value to an input.
  • the output value is corrected by supervised learning or machine learning. In machine learning, deep learning in which judgment elements are further subdivided may be performed.
  • the head unit 1 or the speaker 3E receives the user's voice from the microphone, performs voice recognition, and answers the user's question.
  • the head unit 1 or the speaker 3E performs speech recognition such as “near”, “parking lot”, and “finding”, and inputs Treat as a value.
  • the neural network derives an answer from these recognition results.
  • the head unit 1 or the speaker 3E outputs the derived answer as sound from the speaker unit 38.
  • the head unit 1 or the speaker 3E guides the user's question.
  • the microphone unit 39 is provided for each user, so that different questions can be received for each user, and different guidance can be provided for each user.
  • the head unit 1 When the head unit 1 is connected to a car navigation system, the head unit 1 acquires information related to the required time to the target position based on the current position and the target position. It is also good.
  • the speech sound output from the speaker unit 38 may be adjusted to a sound that the user can easily hear by adjusting the frequency characteristic according to the disturbance sound such as the surrounding noise.
  • the head unit 1 or the speaker 3E is not artificial intelligence, and for example, it is possible to call a call center and to be guided by the operator.
  • the head unit 1 or the speaker 3E makes a call to the call center via a device connected to the mobile communication network or a device connected to the mobile communication network such as a mobile phone.
  • the head unit 1 or the speaker 3E performs translation processing by the CPU.
  • the head unit 1 or the speaker 3E performs voice recognition.
  • the head unit 1 or the speaker 3E determines the used language of the recognized voice and translates it into a different language.
  • the language to be translated is preset.
  • the head unit 1 or the speaker 3E may perform translation using artificial intelligence.
  • the microphone unit 39 of the speaker 3E installed in the headrest 5FR of the driver's seat transmits the voice to the head unit 1.
  • the head unit 1 analyzes the input Japanese speech and translates it into English.
  • the head unit 1 generates an audio signal according to the corresponding English voice.
  • the head unit 1 transmits the generated audio signal to the speaker 3E installed in the headrest of the rear seat.
  • the speaker 3E installed in the headrest of the rear seat emits English sound based on the received audio signal.
  • the guidance voice according to the above-mentioned guidance by (1) artificial intelligence may be translated into a predetermined language and output from the speaker 3E.
  • the technical concept of this embodiment is as follows. (1) A housing attached to the headrest support that contacts the head; A speaker unit provided in the housing; Headrest speaker with. (2) In the above (1), The housing has a hole into which the post is inserted. Headrest speaker.
  • the housing has a notch for holding the post. Headrest speaker.
  • the cutaway portion is L-shaped in plan view.
  • the speaker unit is provided inward in the housing. Headrest speaker.
  • the speaker unit is provided upward in the housing. Headrest speaker.
  • the speaker unit vibrates the headrest to transmit sound to the user by the vibration of the headrest.
  • Headrest speaker
  • a wireless communication unit disposed at an end of the housing; Headrest speaker.
  • a speaker unit disposed outward from the side of the headrest in contact with the head; An openable reflector which reflects the sound output from the speaker unit; Headrest speaker with.
  • a headband that holds the headrest in contact with the head;
  • a speaker unit attached inward to the headrest at an end of the headband and in contact with the headrest; Headrest speaker with.
  • a signal processing unit that performs predetermined signal processing on the audio signal; Headrest speaker.
  • the headrest speaker according to any one of the above (1) to (12); A head unit for supplying an audio signal to the headrest speaker; Acoustic system equipped with

Abstract

This speaker for a headrest is provided with a housing and a speaker unit. The housing is mounted on a prop of the headrest, which comes into contact with a head. The speaker unit is provided in the housing.

Description

ヘッドレスト用スピーカHeadrest speaker
　本発明のいくつかの実施形態は、ヘッドレスト用スピーカに関する。 Some embodiments of the present invention relate to a headrest speaker.
　一般に、自動車等の乗り物においては、ドア等の室内の壁面となる箇所にスピーカが固定されている。また、特許文献１には、スピーカを内蔵したヘッドレストが開示されている。また、特許文献２には、既存のヘッドレストの左右に、スピーカを配置するための構造が開示されている。 In general, in a vehicle such as a car, a speaker is fixed to a place that becomes a wall surface in a room such as a door. Further, Patent Document 1 discloses a headrest incorporating a speaker. Further, Patent Document 2 discloses a structure for arranging speakers on the left and right of the existing headrest.
特開２００５－０５８２８７号公報JP, 2005-058287, A 特開２００５－１６７３７８号公報JP, 2005-167378, A
　特許文献１のように、スピーカを内蔵したヘッドレストでは、座席に対して予め設置する必要がある。また、ヘッドレストを交換可能な場合であっても、ヘッドレストの形状は、車種毎に定められているため、汎用性がない。また、ヘッドレスト自体の緩衝性を妨げる可能性がある。 As described in Patent Document 1, in a headrest having a built-in speaker, it is necessary to install the seat in advance. In addition, even when the headrest can be replaced, the shape of the headrest is determined for each vehicle type, and therefore, there is no versatility. Also, the cushioning properties of the headrest itself may be impeded.
　また、特許文献２のように、既存のヘッドレストの左右にスピーカを配置する場合には、使用しないときに邪魔になる。また、事故等のように急激な加速度の変化が生じた場合に、搭乗者とスピーカとが衝突する可能性もある。 Moreover, when arrange | positioning a speaker to the right and left of the existing headrest like patent document 2, when not using it, it will become obstructive. In addition, when a sudden change in acceleration occurs as in an accident or the like, the passenger may collide with the speaker.
　そこで、本発明のいくつかの実施形態は、利用者にとって邪魔にならずに、既存のヘッドレストを利用することができる、ヘッドレスト用スピーカを提供することを目的とする。 Thus, some embodiments of the present invention aim to provide a headrest speaker that can utilize an existing headrest without disturbing the user.
　本発明のいくつかの実施形態に係るヘッドレスト用スピーカは、筐体と、スピーカユニットと、を備えている。筐体は、頭部に接触するヘッドレストの支柱に取り付けられる。スピーカユニットは、前記筐体に設けられている。 A headrest speaker according to some embodiments of the present invention includes a housing and a speaker unit. The housing is attached to the post of the headrest in contact with the head. The speaker unit is provided in the case.
　本発明のいくつかの実施形態は、利用者にとって邪魔にならずに、既存のヘッドレストを利用することができる。 Some embodiments of the present invention can utilize existing headrests without disturbing the user.
車内の状態を示す平面図である。It is a top view which shows the state in a car. ヘッドユニット１の構成を示すブロック図である。FIG. 2 is a block diagram showing the configuration of a head unit 1; スピーカ３の構成を示すブロック図である。FIG. 2 is a block diagram showing the configuration of a speaker 3; ヘッドレスト５ＦＲ、シート１０ＦＲ、およびスピーカ３の分解斜視図である。FIG. 6 is an exploded perspective view of a headrest 5FR, a seat 10FR, and a speaker 3. スピーカ３の斜視図である。FIG. 3 is a perspective view of the speaker 3; 図６（Ａ）は、筐体５１の一部を透過した平面図であり、図６（Ｂ）は、筐体５１の一部を透過した平面図である。FIG. 6A is a plan view in which a part of the housing 51 is transmitted, and FIG. 6B is a plan view in which a part of the housing 51 is transmitted. 図７（Ａ）および図７（Ｂ）は、筐体５１の一部を透過した右側面図であり、図７（Ｃ）は、スピーカ３の一部透過斜視図である。FIG. 7A and FIG. 7B are right side views in which a part of the housing 51 is transmitted, and FIG. 7C is a partially transparent perspective view of the speaker 3. 図８（Ａ）および図８（Ｂ）は、筐体の変形例を示す斜視図である。FIGS. 8A and 8B are perspective views showing modifications of the housing. 図９（Ａ）および図９（Ｂ）は、第２実施形態に係るスピーカ３Ｃの斜視図である。FIG. 9A and FIG. 9B are perspective views of the speaker 3C according to the second embodiment. 図１０（Ａ）および図１０（Ｂ）は、第３実施形態に係るスピーカ３Ｄの斜視図である。FIG. 10A and FIG. 10B are perspective views of a loudspeaker 3D according to the third embodiment. 図１１は、車内の状態を示す平面図である。FIG. 11 is a plan view showing an in-vehicle state. スピーカ３Ｅの構成を示すブロック図である。It is a block diagram showing composition of speaker 3E. スピーカ３Ｅおよびヘッドユニット１の動作を示すフローチャートである。5 is a flowchart showing operations of the speaker 3E and the head unit 1; オーディオ信号の処理の他の例（応用例２）として、仮想定位処理を行なう場合の、車内の模式的な平面図である。As another example (application example 2) of processing of an audio signal, it is a typical top view in the car in the case of performing virtual localization processing. 応用例４に係る信号処理を説明するための、車内の模式的な平面図である。FIG. 18 is a schematic plan view of the interior of a vehicle for illustrating signal processing according to Application Example 4;
　図１は、車内の状態を示す模式的な平面図である。車内には、ヘッドユニット１およびモニタ２０が配置されている。図１では、一例として、３列のシートが配置された車内を示す。前方の運転席のシート１０ＦＲおよび助手席のシート１０ＦＬには、それぞれヘッドレスト５ＦＲおよびヘッドレスト５ＦＬが取り付けられている。２列目のシート１０Ｃには、３つのヘッドレスト５Ｃ、ヘッドレスト５ＣＲ、およびヘッドレスト５ＣＬが取り付けられている。また、３列目のシート１０Ｒには、３つのヘッドレスト５Ｒ、ヘッドレスト５ＲＲ、およびヘッドレスト５ＲＬが取り付けられている。 FIG. 1 is a schematic plan view showing an in-vehicle state. The head unit 1 and the monitor 20 are disposed in the vehicle. FIG. 1 shows the interior of a vehicle in which three rows of seats are arranged, as an example. A headrest 5FR and a headrest 5FL are attached to the front driver's seat 10FR and the front passenger's seat 10FL, respectively. Three headrests 5C, a headrest 5CR, and a headrest 5CL are attached to the seat 10C in the second row. In addition, three headrests 5R, a headrest 5RR, and a headrest 5RL are attached to the third row of seats 10R.
　ヘッドユニット１は、車内の前方の中央に配置されている。ただし、ヘッドユニット１の配置場所は、車内の前方の中央に限らない。ヘッドユニット１は、自動車等の乗り物に搭載される音響機器の一例である。図２は、ヘッドユニット１の構成を示すブロック図である。 The head unit 1 is disposed at the front center of the vehicle. However, the placement position of the head unit 1 is not limited to the front center of the vehicle. The head unit 1 is an example of an acoustic device mounted on a vehicle such as a car. FIG. 2 is a block diagram showing the configuration of the head unit 1.
　ヘッドユニット１は、無線通信部１２、ＣＰＵ１４、ＲＯＭ１５、ＲＡＭ１６、ＤＳＰ１７、入力Ｉ／Ｆ１８、音源１９、バス２００、ミキサ２１、および出力Ｉ／Ｆ２２を備えている。 The head unit 1 includes a wireless communication unit 12, a CPU 14, a ROM 15, a RAM 16, a DSP 17, an input I / F 18, a sound source 19, a bus 200, a mixer 21, and an output I / F 22.
　無線通信部１２、ＣＰＵ１４、ＲＯＭ１５、ＲＡＭ１６、ＤＳＰ１７、入力Ｉ／Ｆ１８、音源１９、ミキサ２１、および出力Ｉ／Ｆ２２は、バス２００を介して接続される。また、出力Ｉ／Ｆ２２には、モニタ２０が接続される。無線通信部１２には、スピーカ３が無線で接続される。無線通信は、どの様な方式であってもよいが、例えば、Ｂｌｕｅｔｏｏｔｈ（登録商標）、赤外線通信、または無線ＬＡＮを用いる。なお、本発明においては、ヘッドユニット１およびスピーカ３の接続は、無線に限るものではない。ヘッドユニット１およびスピーカ３は、例えば、オーディオケーブルを介して接続してもよい。 The wireless communication unit 12, the CPU 14, the ROM 15, the RAM 16, the DSP 17, the input I / F 18, the sound source 19, the mixer 21, and the output I / F 22 are connected via a bus 200. Further, a monitor 20 is connected to the output I / F 22. The speaker 3 is wirelessly connected to the wireless communication unit 12. The wireless communication may be any method, for example, Bluetooth (registered trademark), infrared communication, or wireless LAN. In the present invention, the connection between the head unit 1 and the speaker 3 is not limited to wireless connection. The head unit 1 and the speaker 3 may be connected, for example, via an audio cable.
　ＣＰＵ１４は、記憶媒体であるＲＯＭ１５に記憶されているプログラムをＲＡＭ１６に読み出し、ヘッドユニット１を統括的に制御する。 The CPU 14 reads a program stored in the ROM 15 which is a storage medium into the RAM 16 and centrally controls the head unit 1.
　例えば、ＣＰＵ１４は、音源１９から出力されるオーディオ信号をミキサ２１に入力する。また、ＣＰＵ１４は、入力Ｉ／Ｆ１８から入力したオーディオ信号をミキサ２１に入力する。ミキサ２１は、音源１９から出力されるオーディオ信号と入力Ｉ／Ｆ１８から入力したオーディオ信号とをミキシングする。 For example, the CPU 14 inputs an audio signal output from the sound source 19 to the mixer 21. The CPU 14 also inputs an audio signal input from the input I / F 18 to the mixer 21. The mixer 21 mixes the audio signal output from the sound source 19 with the audio signal input from the input I / F 18.
　ＣＰＵ１４は、ミキサ２１でミキシングされたオーディオ信号をＤＳＰ１７に入力する。入力Ｉ／Ｆ１８には、オーディオ信号が入力される。入力Ｉ／Ｆ１８には、例えば入力端子が接続される。入力端子は、例えば車内の各シートの横に配置されている。入力端子には、マイク、情報処理装置（タブレット端末またはスマートフォン等）、携帯型のゲーム機、またはオーディオ信号出力端子を備えた知育玩具（タブレット型の玩具）等が接続される。これにより、入力Ｉ／Ｆ１８には、マイク、情報処理装置（タブレット端末またはスマートフォン等）、携帯型のゲーム機、またはオーディオ信号出力端子を備えた知育玩具（タブレット型の玩具）等からオーディオ信号が入力される。 The CPU 14 inputs the audio signal mixed by the mixer 21 to the DSP 17. An audio signal is input to the input I / F 18. For example, an input terminal is connected to the input I / F 18. The input terminal is disposed, for example, next to each seat in the car. To the input terminal, a microphone, an information processing apparatus (a tablet terminal, a smartphone, or the like), a portable game machine, an educational toy (tablet toy) provided with an audio signal output terminal, or the like is connected. As a result, the input I / F 18 receives an audio signal from 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. It is input.
　ＤＳＰ１７は、信号処理部の一例である。ＤＳＰ１７は、入力したオーディオ信号の音量または音質を調整する。音質調整は、例えば周波数特性の調整、またはノイズキャンセル処理である。ＤＳＰ１７は、音質調整をした後のオーディオ信号を無線通信部１２に出力する。ＣＰＵ１４は、無線通信部１２を介して、スピーカ３にオーディオ信号を出力する。 The DSP 17 is an example of a signal processing unit. The DSP 17 adjusts the volume or sound quality of the input audio signal. The sound quality adjustment is, for example, adjustment of frequency characteristics or noise cancellation processing. The DSP 17 outputs the audio signal after the sound quality adjustment to the wireless communication unit 12. The CPU 14 outputs an audio signal to the speaker 3 via the wireless communication unit 12.
　音源１９は、複数のオーディオソースを有している。音源１９は、オーディオソースとして、例えば、ＦＭチューナ、ＡＭチューナ、ＣＤプレーヤ、ＭＤプレーヤ、磁気カセットデッキ、ＡＵＸ端子、ＤＶＤプレーヤ、ハードディスクドライブ、またはＴＶチューナなどを有する。 The sound source 19 has a plurality of audio sources. The sound source 19 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.
　ユーザは、例えば、ＤＶＤプレーヤで映画のコンテンツを再生する。ヘッドユニット１は、出力Ｉ／Ｆ２２を介してスピーカ３に映画のコンテンツの再生音を送信し、スピーカ３から再生音を出力させる。また、ユーザは、ＣＤプレーヤ等で音楽を再生させ、マイクを用いて歌唱を行なうことで、車内でカラオケを楽しむこともできる。この場合、ヘッドユニット１は、ＣＤプレーヤの再生音と、入力Ｉ／Ｆ１８から入力された歌唱音とをミキシングし、スピーカ３に出力する。 The user plays movie content, for example, on a DVD player. The head unit 1 transmits the reproduction sound of the movie content to the speaker 3 via the output I / F 22, and causes the speaker 3 to output the reproduction sound. The user can also enjoy karaoke in the car by playing music with a CD player or the like and singing using a microphone. In this case, the head unit 1 mixes the reproduced sound of the CD player with the singing sound input from the input I / F 18 and outputs the mixed sound to the speaker 3.
　モニタ２０は、車内の前方および中央に配置されている。モニタ２０は、例えばＤＶＤプレーヤで再生された映像を表示する。 The monitor 20 is disposed in front of and in the center of the vehicle. The monitor 20 displays, for example, an image reproduced by a DVD player.
　図３は、スピーカ３の構成を示すブロック図である。図４は、ヘッドレスト５ＦＲ、シート１０ＦＲ、およびスピーカ３の分解斜視図である。図５は、スピーカ３の斜視図である。なお、図４においては、代表してシート１０ＦＲおよびヘッドレスト５ＦＲについてスピーカ３が取り付けられる様子を示すが、他のシートおよびヘッドレストについても同様にスピーカ３が取り付けられる。 FIG. 3 is a block diagram showing the configuration of the speaker 3. FIG. 4 is an exploded perspective view of the headrest 5FR, the seat 10FR, and the speaker 3. FIG. 5 is a perspective view of the speaker 3. Although FIG. 4 representatively shows that the speaker 3 is attached to the seat 10FR and the headrest 5FR, the speaker 3 is attached to other seats and the headrest in the same manner.
　スピーカ３は、無線通信部３１、ＣＰＵ３２、ＲＯＭ３３、ＲＡＭ３４、ＤＳＰ３５、Ｄ／Ａコンバータ３６、アンプ３７、スピーカユニット３８、およびバス３００を備えている。 The speaker 3 includes a wireless communication unit 31, a CPU 32, a ROM 33, a RAM 34, a DSP 35, a D / A converter 36, an amplifier 37, a speaker unit 38, and a bus 300.
　無線通信部３１、ＣＰＵ３２、ＲＯＭ３３、ＲＡＭ３４、ＤＳＰ３５、Ｄ／Ａコンバータ３６、アンプ３７、およびスピーカユニット３８は、バス３００を介して接続される。 The wireless communication unit 31, the CPU 32, the ROM 33, the RAM 34, the DSP 35, the D / A converter 36, the amplifier 37, and the speaker unit 38 are connected via the bus 300.
　ＣＰＵ３２は、記憶媒体であるＲＯＭ３３に記憶されているプログラムをＲＡＭ３４に読み出し、スピーカ３を統括的に制御する。 The CPU 32 reads a program stored in the ROM 33, which is a storage medium, into the RAM 34, and centrally controls the speaker 3.
　例えば、ＣＰＵ３２は、無線通信部３１を介してヘッドユニット１から受信したオーディオ信号をＤＳＰ３５に入力する。ＤＳＰ３５は、入力されたオーディオ信号に所定の信号処理を施して、Ｄ／Ａコンバータ３６に出力する。 For example, the CPU 32 inputs an audio signal received from the head unit 1 via the wireless communication unit 31 to the DSP 35. The DSP 35 performs predetermined signal processing on the input audio signal and outputs the processed signal to the D / A converter 36.
　Ｄ／Ａコンバータ３６は、入力されたオーディオ信号をアナログ信号に変換して、アンプ３７に出力する。アンプ３７は、該アナログ信号を増幅し、スピーカユニット３８に出力する。スピーカユニット３８は、入力されたアナログ信号に基づいて音を出力する。 The D / A converter 36 converts the input audio signal into an analog signal and outputs the analog signal to the amplifier 37. The amplifier 37 amplifies the analog signal and outputs it to the speaker unit 38. The speaker unit 38 outputs a sound based on the input analog signal.
　スピーカ３は、直方体形状の筐体５１を有する。筐体５１は、高さ方向に短く、シート１０ＦＲおよびヘッドレスト５ＦＲの間に挟み込まれるようになっている。筐体５１の左右方向の幅および前後方向の長さは、ヘッドレスト５ＦＲの底面の幅および長さと同程度である。ただし、筐体５１の幅および長さは、厳密に、ヘッドレスト５ＦＲの底面の幅および長さと同じである必要はない。 The speaker 3 has a rectangular parallelepiped housing 51. The housing 51 is short in the height direction and is sandwiched between the seat 10FR and the headrest 5FR. The width in the left-right direction and the length in the front-rear direction of the housing 51 are substantially the same as the width and the length of the bottom surface of the headrest 5FR. However, the width and the length of the housing 51 do not have to be strictly the same as the width and the length of the bottom of the headrest 5FR.
　筐体５１は、上面から下面まで貫通した２つの孔５２を備えている。これら２つの孔５２には、ヘッドレスト５ＦＲの２つの支柱１００が挿入される。これにより、筐体５１は、ヘッドレスト５ＦＲおよびシート１０ＦＲで挟み込まれて固定される。 The housing 51 is provided with two holes 52 penetrating from the upper surface to the lower surface. The two pillars 100 of the headrest 5FR are inserted into these two holes 52. Thus, the housing 51 is sandwiched and fixed by the headrest 5FR and the seat 10FR.
　図６（Ａ）は、筐体５１の一部を透過した平面図である。また、図７（Ａ）は、筐体５１の一部を透過した左側面図である。スピーカユニット３８は、筐体５１の内部のうち、前方向（図６（Ａ）の下方向、図７（Ａ）の左方向）の端部に配置されている。筐体５１の前方は、パンチングメタルまたはサランネット等が配置されていて、音響的に開放されている。 FIG. 6A is a plan view in which a part of the housing 51 is transmitted. FIG. 7A is a left side view in which a part of the housing 51 is transmitted. The speaker unit 38 is disposed at the end of the inside of the housing 51 in the front direction (the downward direction in FIG. 6A, the left direction in FIG. 7A). In front of the case 51, a punching metal, a saran net or the like is disposed and is acoustically open.
　この例では、２つのスピーカユニット３８が、筐体５１の左右に配置されている。２つのスピーカユニット３８は、利用者の後頭部から左右の耳を挟み込む位置に配置されている。したがって、スピーカユニット３８は、利用者に音を聴取させるのに理想的な配置となっている。ただし、本発明におけるスピーカユニット３８の数は、２つに限らない。 In this example, two speaker units 38 are disposed on the left and right of the housing 51. The two speaker units 38 are disposed at positions where the left and right ears are pinched from the back of the head of the user. Therefore, the speaker unit 38 is in an ideal arrangement for the user to listen to the sound. However, the number of speaker units 38 in the present invention is not limited to two.
　無線通信部３１は、筐体５１の内部のうち、前方の左右端部に設けられている。上述の様に、無線通信部３１は、Ｂｌｕｅｔｏｏｔｈ（登録商標）、赤外線通信、または無線ＬＡＮを用いる。ヘッドユニット１は、車内の前方中央に配置されている。無線通信部３１は、赤外線通信を行なう場合、受光素子が利用者の頭部または首に遮られない様に、筐体５１の左右端部に配置されていることが好ましい。 The wireless communication unit 31 is provided at the front left and right ends of the inside of the housing 51. As described above, the wireless communication unit 31 uses Bluetooth (registered trademark), infrared communication, or a wireless LAN. The head unit 1 is disposed in the front center of the vehicle. The wireless communication unit 31 is preferably disposed at the left and right ends of the housing 51 so that the light receiving element is not blocked by the head or neck of the user when performing infrared communication.
　なお、上述したように、ヘッドユニット１およびスピーカ３の接続は、無線に限るものではない。例えば、ヘッドユニット１およびスピーカ３は、アナログオーディオケーブルで接続されてもよい。また、ヘッドユニット１においてパワーアンプを内蔵し、増幅後のオーディオ信号をスピーカ３に供給してもよい。この場合、スピーカ３には、電源が不要であるし、無線通信部３１、ＣＰＵ３２、ＲＯＭ３３、ＲＡＭ３４、ＤＳＰ３５、Ｄ／Ａコンバータ３６、アンプ３７、およびバス３００は、不要である。スピーカ３は、電源供給が必要な場合には、内蔵バッテリー、車内のシガーソケット、またはＵＳＢインタフェース等から電源供給を受ける。また、後部座席用のリアモニターがある場合には、スピーカ３は、該リアモニターからオーディオ信号の供給を受けてもよい。この場合、リアモニターは、ヘッドユニット１に接続され、ヘッドユニット１からオーディオ信号の供給を受けるとともに、スピーカ３に対してオーディオ信号を供給する。 As described above, the connection between the head unit 1 and the speaker 3 is not limited to wireless connection. For example, the head unit 1 and the speaker 3 may be connected by an analog audio cable. In addition, a power amplifier may be incorporated in the head unit 1 and the amplified audio signal may be supplied to the speaker 3. In this case, the speaker 3 does not need a power supply, and the wireless communication unit 31, the CPU 32, the ROM 33, the RAM 34, the DSP 35, the D / A converter 36, the amplifier 37, and the bus 300 are unnecessary. The speaker 3 receives power supply from a built-in battery, a cigar socket in a car, a USB interface, or the like when power supply is required. Also, if there is a rear monitor for the rear seat, the speaker 3 may receive an audio signal from the rear monitor. In this case, the rear monitor is connected to the head unit 1, receives an audio signal from the head unit 1, and supplies an audio signal to the speaker 3.
　以上の様に、本実施形態のスピーカ３は、各シートのヘッドレストに取り付けられるため、各利用者の頭部および耳の近くで音を出力することができる。従来のドア等に固定されたスピーカは、利用者の頭部および耳から遠い位置に設置されている。したがって、従来のドア等に固定されたスピーカは、ある程度の音量で出力しなければ、利用者に聴き取り易い音にはならなかった。しかし、本実施形態のスピーカ３は、各利用者の頭部および耳の近くで音を出力するため、小音量であっても、利用者が聴き取り易い。また、各利用者が別々のコンテンツの音を聴いている場合でも、他の利用者に音が漏れることを防止しながらも、各利用者が音を楽しむことができる。 As described above, since the speaker 3 of this embodiment is attached to the headrest of each seat, it can output sound near the head and ear of each user. The speaker fixed to the conventional door etc. is installed in the position far from a user's head and ear. Therefore, the speaker fixed to the conventional door etc. did not become a sound easy to be heard by the user if it did not output with a certain volume. However, the speaker 3 according to the present embodiment outputs sound near the head and ear of each user, so that the user can easily listen to even a small volume. In addition, even when each user is listening to the sound of different content, each user can enjoy the sound while preventing the sound from leaking to other users.
　さらに、本実施形態のスピーカ３は、車内に設置するために、耐熱性は高いが音質の低いスピーカユニット（例えば金属部材のスピーカコーン）を用いる場合であっても、各利用者の頭部および耳の近くで音を出力するため、利用者が聴き取り易い。 Furthermore, the speaker 3 according to the present embodiment, even when using a speaker unit having high heat resistance but low sound quality (for example, a speaker cone of a metal member) for installation in a car, the head of each user and The user can easily listen to the sound because the sound is output near the ear.
　さらに、コンテンツに、例えば映画等のセリフが含まれている場合、当該セリフの帯域と、ロードノイズ等の外乱の帯域とが、重複することがある。この場合、利用者は、セリフの音がロードノイズ等の外乱音にマスキングされて、聞こえ難い場合が多い。しかし、本実施形態のスピーカ３は、各利用者の頭部および耳の近くで音を出力するため、利用者がセリフの音を聴き取り易い。 Furthermore, when the content includes, for example, a speech such as a movie, the band of the speech may overlap with the band of disturbance such as road noise. In this case, the user often has the speech noise masked by disturbance noise such as road noise, which makes it difficult to hear. However, since the speaker 3 of this embodiment outputs sound near the head and ear of each user, the user can easily listen to the speech.
　また、セリフの音は、マルチチャンネルオーディオにおける、センタチャンネルに対応する。そのため、映画館または一般的なホームシアター向けの音響システムでは、セリフの音を聴取者の前方の中央（すなわち、画面の近く）に定位させる。一方で、本実施形態のスピーカ３は、利用者の後頭部から音を発する。人は、前方よりも、後方からの音に対しては、定位感を得ることは難しい。したがって、利用者は、耳に頼って、セリフの音の音源位置を判断することが困難になる。この場合、利用者は、視覚に頼ってセリフの音の音源位置を判断することになる。そのため、本実施形態のスピーカ３では、利用者は、モニタ２０に表示された人の口元に音源があるように知覚する。特にリアモニターは、後部座席に座る視聴者の前方所定距離（例えば５０～７０ｃｍ程度）の位置に配置されるため、この様な視覚に頼った音源位置の知覚がより効果的に発揮される。 Also, the sound of speech corresponds to the center channel in multi-channel audio. Therefore, in a sound system for movie theaters or general home theaters, the sound of speech is localized in the front center of the listener (that is, near the screen). On the other hand, the speaker 3 of this embodiment emits a sound from the back of the user's head. It is difficult for a person to obtain a sense of stereotacticity for sounds from the rear and from the front. Therefore, it is difficult for the user to determine the sound source position of the speech by relying on the ear. In this case, the user relies on the vision to determine the sound source position of the speech. Therefore, in the speaker 3 of the present embodiment, the user perceives that the sound source is present at the mouth of the person displayed on the monitor 20. In particular, since the rear monitor is disposed at a predetermined distance in front of the viewer sitting in the rear seat (for example, about 50 to 70 cm), the perception of the sound source position based on such vision is more effectively exhibited.
　よって、本実施形態のスピーカ３は、映像（特に人の映像）に同期して音を発するコンテンツには好適である。 Therefore, the speaker 3 of the present embodiment is suitable for content that emits sound in synchronization with a video (particularly, a video of a person).
　次に、スピーカ３の変形例について説明する。図６（Ｂ）は、筐体５１の一部を透過した平面図である。この変形例では、スピーカユニット３８は、内側に向けられている。この様に、スピーカユニット３８を内側に向けて配置することで、より音漏れを軽減しつつ、シートに座る利用者にだけ、音が届きやすくなる。 Next, a modification of the speaker 3 will be described. FIG. 6B is a plan view in which a part of the housing 51 is transmitted. In this variation, the speaker unit 38 is directed inward. In this manner, by arranging the speaker unit 38 inward, sound can be easily delivered only to the user sitting on the seat while reducing sound leakage.
　図７（Ｂ）は、筐体５１の一部を透過した右側面図である。この変形例では、スピーカユニット３８は、斜め上方に向けられている。ヘッドレストの支柱は、利用者の首の付近に配置されているため、図７（Ｂ）に示す様にスピーカユニット３８を斜め上方に向けて配置することで、より音漏れを軽減しつつ、シートに座る利用者にだけ、音が届きやすくなる。 FIG. 7B is a right side view in which a part of the housing 51 is transmitted. In this modification, the speaker unit 38 is directed obliquely upward. Since the pillars of the headrest are arranged near the neck of the user, by disposing the speaker unit 38 obliquely upward as shown in FIG. 7B, the sound leakage is further reduced while the sound leakage is reduced. The sound can be easily reached only to the user who is sitting at.
　図７（Ｃ）は、スピーカ３の一部透過斜視図である。この変形例では、スピーカユニット３８は、内側に向けられ、かつ斜め上方に向けられている。したがって、さらに音漏れを軽減しつつ、シートに座る利用者にだけ、音が届きやすくなる。 FIG. 7C is a partially transparent perspective view of the speaker 3. In this modification, the speaker unit 38 is directed inward and obliquely upward. Therefore, the sound can be easily delivered only to the user sitting on the seat, while further reducing the sound leakage.
　なお、スピーカユニット３８の向きは、例えば斜め下方に向いていてもよい。利用者が子供である場合には、頭部および耳の位置は、ヘッドレストの支柱よりも下方になる場合がある。この場合、スピーカユニット３８の向きは、斜め下方に向いていることで、音漏れを軽減しつつ、シートに座る利用者にだけ、音が届きやすくなる。 The direction of the speaker unit 38 may be, for example, obliquely downward. If the user is a child, the position of the head and ears may be below the post of the headrest. In this case, since the direction of the speaker unit 38 is directed obliquely downward, it is easy for the sound to reach only the user sitting on the seat while reducing the sound leakage.
　なお、本実施形態のスピーカ３は、空間を経て音を利用者に伝える例を示したが、利用者の頭部または首等にスピーカユニット３８で生じる振動を伝えることにより、音を利用者に伝達させることも可能である。 Although the speaker 3 of the present embodiment shows an example of transmitting the sound to the user through the space, the sound generated by the speaker unit 38 is transmitted to the user's head or neck or the like. Transmission is also possible.
　例えば、スピーカユニット３８は、筐体５１の上面において、上向きに設置されてもよい。この場合、スピーカユニット３８から出力される音により、ヘッドレスト５ＦＲが振動する。ヘッドレスト５ＦＲが振動すると、該ヘッドレスト５ＦＲの振動が利用者の頭部に伝わり、骨伝導で音を伝えることができる。 For example, the speaker unit 38 may be installed upward on the top surface of the housing 51. In this case, the headrest 5FR vibrates by the sound output from the speaker unit 38. When the headrest 5FR vibrates, the vibration of the headrest 5FR is transmitted to the head of the user, so that the sound can be transmitted by bone conduction.
　また、例えば、スピーカユニット３８は、筐体５１の下面において、下向きに設置されてもよい。この場合、スピーカユニット３８から出力される音により、シート１０ＦＲが振動する。人は、身体に伝わる振動によっても音を感じることができる。特に、低音については、耳よりも身体に伝わる振動のほうが良い音として知覚する場合がある。そのため、各シートに座る利用者は、他の利用者に音が漏れることを防止しながらも、従来よりもより良い音を楽しむことができる。なお、本実施形態のスピーカ３は、振動により音をより効果的に知覚させるために、スピーカユニット３８の代わりに（またはスピーカユニット３８に加えて）骨伝導アクチュエータを備えていてもよい。 Also, for example, the speaker unit 38 may be installed downward on the lower surface of the housing 51. In this case, the sheet 10FR is vibrated by the sound output from the speaker unit 38. A person can also feel the sound by the vibration transmitted to the body. In particular, with regard to bass, vibration transmitted to the body may be perceived as a better sound than the ear. Therefore, the user sitting on each sheet can enjoy better sound than before, while preventing the sound from leaking to other users. In addition, the speaker 3 of this embodiment may be provided with a bone conduction actuator instead of the speaker unit 38 (or in addition to the speaker unit 38) in order to make a sound more effectively perceived by vibration.
　次に、図８（Ａ）は、筐体の変形例を示す斜視図である。図８（Ａ）に示すスピーカ３Ａは、筐体５１Ａを備える。その他の構成は、スピーカ３と同様である。 Next, FIG. 8A is a perspective view showing a modified example of the housing. The speaker 3A shown in FIG. 8A includes a housing 51A. The other configuration is the same as that of the speaker 3.
　筐体５１Ａは、平面視して直線状の切り欠き部３１Ａを有する。切り欠き部３１Ａは、筐体５１Ａの左側面から右側面に向かって形成されている。切り欠き部３１Ａには、ヘッドレスト５ＦＲの支柱１００が横方向からはめ込まれる。利用者は、ヘッドレスト５ＦＲの高さを高い状態にして、ヘッドレスト５ＦＲの右側からスピーカ３の切り欠き部３１Ａをはめ込む。その後、利用者は、ヘッドレスト５ＦＲの高さを低くすることで、ヘッドレスト５ＦＲおよびシート１０ＦＲでスピーカ３を挟み込む。これにより、スピーカ３は、ヘッドレスト５ＦＲおよびシート１０ＦＲに固定される。なお、切り欠き部分３１Ａには、支柱１００に固定するための固定機構が設けられてもよい。例えば、切り欠き部３１Ａには、支柱１００を挟み込む機械的な固定機構が設けられていてもよい。また、切り欠き部３１Ａには、ゴム等の滑り止め機構が設けられていてもよい。 The housing 51A has a linear notch 31A in plan view. The notch 31A is formed from the left side surface of the housing 51A toward the right side surface. The pillar 100 of the headrest 5FR is fitted into the cutout 31A from the lateral direction. A user makes height of headrest 5FR high, and inserts notch 31A of speaker 3 from the right side of headrest 5FR. Thereafter, the user clamps the speaker 3 with the headrest 5FR and the seat 10FR by lowering the height of the headrest 5FR. Thereby, the speaker 3 is fixed to the headrest 5FR and the seat 10FR. In addition, the fixing mechanism for fixing to the support | pillar 100 may be provided in the notch part 31A. For example, the notch 31 </ b> A may be provided with a mechanical fixing mechanism for holding the support 100. Further, the notch 31A may be provided with a non-slip mechanism such as rubber.
　また、利用者は、ヘッドレスト５ＦＲの高さを高くして、スピーカ３を右側にスライドさせることで、スピーカ３を容易に外すことができる。 Also, the user can easily remove the speaker 3 by raising the height of the headrest 5FR and sliding the speaker 3 to the right.
　なお、切り欠き部３１Ａは、筐体５１Ａの右側面から左側面に向かって形成されていてもよい。 The notch 31A may be formed from the right side surface of the housing 51A toward the left side surface.
　図８（Ｂ）は、筐体の変形例を示す斜視図である。図８（Ｂ）に示すスピーカ３Ｂは、筐体５１Ｂを備える。その他の構成は、スピーカ３およびスピーカ３Ａと同様である。 FIG. 8B is a perspective view showing a modified example of the housing. The speaker 3B shown in FIG. 8B includes a housing 51B. The other configuration is the same as the speaker 3 and the speaker 3A.
　筐体５１Ｂは、平面視してＬ字型の切り欠き部３１Ｂを有する。切り欠き部３１Ｂは、筐体５１Ａの後方の側面から前方に向かって形成された部分と、右側面に向かって形成された部分とを有する。切り欠き部３１Ｂには、ヘッドレスト５ＦＲの支柱１００がはめ込まれる。 The housing 51B has an L-shaped cutout 31B in plan view. Notch 31B has a portion formed forward from the rear side surface of housing 51A and a portion formed toward the right side. The post 100 of the headrest 5FR is fitted into the notch 31B.
　利用者は、ヘッドレスト５ＦＲの高さを高い状態にして、まず、右側の支柱１００に切り欠き部３１Ｂをはめ込む。その後、スピーカ３を後方および左方向に移動させる。そして、左側の支柱１００に切り欠き部３１Ｂをはめ込む。最後に、利用者は、ヘッドレスト５ＦＲの高さを低くすることで、ヘッドレスト５ＦＲおよびシート１０ＦＲでスピーカ３を挟み込む。これにより、スピーカ３は、ヘッドレスト５ＦＲおよびシート１０ＦＲに固定される。なお、切り欠き部分３１Ｂにも、支柱１００に固定するための固定機構が設けられてもよい。例えば、切り欠き部３１Ｂには、支柱１００を挟み込む機械的な固定機構が設けられていてもよい。また、切り欠き部３１Ｂには、ゴム等の滑り止め機構が設けられていてもよい。 The user makes the height of the headrest 5FR high, and first inserts the notch 31B into the right post 100. Thereafter, the speaker 3 is moved backward and leftward. Then, the notch 31 </ b> B is inserted into the left support 100. Finally, the user holds the speaker 3 between the headrest 5FR and the seat 10FR by lowering the height of the headrest 5FR. Thereby, the speaker 3 is fixed to the headrest 5FR and the seat 10FR. In addition, the fixing mechanism for fixing to the support | pillar 100 may be provided also in the notch part 31B. For example, the notch 31 </ b> B may be provided with a mechanical fixing mechanism for holding the support 100. In addition, a non-slip mechanism such as rubber may be provided in the notch portion 31B.
　また、利用者は、ヘッドレスト５ＦＲの高さを高くして、スピーカ３を前方に移動させて左側の支柱１００からスピーカ３を外す。その後、スピーカ３を右側にスライドさせることで、スピーカ３を容易に外すことができる。 Further, the user raises the height of the headrest 5FR, moves the speaker 3 forward, and removes the speaker 3 from the left support 100. Thereafter, the speaker 3 can be easily removed by sliding the speaker 3 to the right.
　ヘッドレストの形状は、車種毎に定められている。また、ヘッドレストの支柱間の幅は、車種毎に異なる場合がある。しかし、図８（Ａ）および図８（Ｂ）のいずれの例においても、切り欠きに支柱をはめ込み、スピーカ３をスライドさせるため、ヘッドレストの支柱１００の間の幅が車種毎に異なる場合でも対応することができる。また、利用者は、ヘッドレストをいったん外すことなく、スピーカ３を取り付けまたは取り外しすることができる。 The shape of the headrest is determined for each vehicle type. Also, the width between the headrest struts may differ from vehicle type to vehicle type. However, in either example of FIG. 8 (A) and FIG. 8 (B), in order to insert a pillar in a notch and slide the speaker 3, even when the width between pillars 100 of a headrest differs for every vehicle type, it corresponds can do. Also, the user can attach or detach the speaker 3 without removing the headrest once.
　次に、図９（Ａ）および図９（Ｂ）は、第２実施形態に係るスピーカ３Ｃの斜視図である。スピーカ３Ｃは、ヘッドフォンタイプのスピーカである。スピーカ３Ｃは、ヘッドレスト５ＦＲを挟み込むヘッドバンド５１Ｃと、ヘッドバンド５１Ｃの端部において、ヘッドレストＦＲに向かって内向きに取り付けられるスピーカユニット３８Ｃと、を備えている。 Next, FIGS. 9A and 9B are perspective views of a speaker 3C according to a second embodiment. The speaker 3C is a headphone type speaker. The speaker 3C includes a headband 51C sandwiching the headrest 5FR, and a speaker unit 38C attached inward toward the headrest FR at an end of the headband 51C.
　スピーカユニット３８Ｃは、ヘッドレスト５ＦＲの側面に接触する。この場合、スピーカユニット３８Ｃから出力される音により、ヘッドレスト５ＦＲが振動する。ヘッドレスト５ＦＲが振動すると、該ヘッドレスト５ＦＲの振動が利用者の頭部に伝わり、骨伝導で音を伝えることができる。そのため、第２の実施形態においても、各シートに座る利用者は、他の利用者に音が漏れることを防止しながらも、従来よりもより良い音を楽しむことができる。 The speaker unit 38C contacts the side surface of the headrest 5FR. In this case, the headrest 5FR is vibrated by the sound output from the speaker unit 38C. When the headrest 5FR vibrates, the vibration of the headrest 5FR is transmitted to the head of the user, so that the sound can be transmitted by bone conduction. Therefore, also in the second embodiment, the user sitting on each sheet can enjoy a better sound than before while preventing the sound from leaking to other users.
　次に、図１０（Ａ）および図１０（Ｂ）は、第３実施形態に係るスピーカ３Ｄの斜視図である。 Next, FIG. 10A and FIG. 10B are perspective views of a speaker 3D according to a third embodiment.
　スピーカ３Ｄは、スピーカユニット３８ＦＲおよび反射板３９ＦＲを備えている。スピーカユニット３８ＦＲは、ヘッドレスト５ＦＲの左右の側面に外向きに配置されている。反射板３９ＦＲは、ヘッドレストの左右の側面に配置され、ヘッドレストの後方の左右端を軸として、開閉自在になっている。反射板３９ＦＲは、一例として、側面視した形状が台形であり、ヘッドレスト５ＦＲの側面形状に沿った形状となっている。反射板３９ＦＲの側面は、平板であり、図１０（Ｂ）に示す様に、反射板３９ＦＲを閉じた場合には、ヘッドレスト５ＦＲと一体化した様な形状となる。 The speaker 3D includes a speaker unit 38FR and a reflector 39FR. The speaker units 38FR are disposed outward on the left and right sides of the headrest 5FR. The reflecting plate 39FR is disposed on the left and right side surfaces of the headrest, and is openable and closable about the rear left and right ends of the headrest. As an example, the reflecting plate 39FR has a trapezoidal shape in a side view, and has a shape following the side shape of the headrest 5FR. The side surface of the reflection plate 39FR is a flat plate, and as shown in FIG. 10B, when the reflection plate 39FR is closed, it has a shape integrated with the headrest 5FR.
　反射板３９ＦＲを開いた場合、反射板３９ＦＲの内側の側面は、前方を向く。したがって、スピーカユニット３８ＦＲから出力された音は、反射板３９ＦＲの内側の側面で反射して、前方に放射される。この場合、利用者は、上述のスピーカ３よりも外側から音が到来し、かつ頭部と同じ高さから音が到来する。この場合も、利用者は、臨場感ある音響を体感することができる。 When the reflection plate 39FR is opened, the inner side surface of the reflection plate 39FR faces the front. Therefore, the sound output from the speaker unit 38FR is reflected by the inner side surface of the reflecting plate 39FR and emitted forward. In this case, the user receives a sound from the outside of the above-described speaker 3 and a sound from the same height as the head. Also in this case, the user can experience a realistic sound.
　また、スピーカユニット３８ＦＲは、外向きにヘッドレスト５ＦＲの左右の側面に配置されているため、ヘッドレストとしての緩衝機能を妨げることはない。また、図１０（Ｂ）に示す様に、スピーカを使用しないときには、反射板３９ＦＲは、閉じられるため、邪魔になることもない。また、事故等のように急激な加速度の変化が生じた場合に、搭乗者に衝突するおそれもない。 In addition, since the speaker unit 38FR is disposed outward on the left and right side surfaces of the headrest 5FR, the speaker unit 38FR does not interfere with the buffer function as the headrest. Further, as shown in FIG. 10 (B), when the speaker is not used, the reflecting plate 39FR is closed, so it does not get in the way. In addition, when there is a sudden change in acceleration, such as an accident, there is no risk of collision with the passenger.
　次に、応用例１に係るスピーカ３Ｅについて説明する。図１１は、車内の状態を示す平面図である。図１と共通する構成については同一の符号を付し、説明を省略する。図１２は、スピーカ３Ｅの構成を示すブロック図である。図４と共通する構成については同一の符号を付し、説明を省略する。図１３は、スピーカ３Ｅおよびヘッドユニット１の動作を示すフローチャートである。 Next, the speaker 3E according to the application example 1 will be described. FIG. 11 is a plan view showing an in-vehicle state. The same reference numerals as in FIG. 1 denote the same parts as in FIG. FIG. 12 is a block diagram showing the configuration of the speaker 3E. The same reference numerals as in FIG. 4 denote the same parts as in FIG. FIG. 13 is a flowchart showing the operation of the speaker 3E and the head unit 1.
　この例では、運転席のシート１０ＦＲおよび後部座席のシート１０Ｒの左側に利用者がいる。スピーカ３Ｅは、さらにマイクユニット３９を備えている。マイクユニット３９は、利用者の音声を取得する（Ｓ１１）。ＣＰＵ３２は、マイクユニット３９で取得した音声に係るオーディオ信号を、無線通信部３１から出力させる。 In this example, there are users on the left side of the driver's seat 10FR and the rear seat 10R. The speaker 3E further includes a microphone unit 39. The microphone unit 39 acquires the voice of the user (S11). The CPU 32 causes the wireless communication unit 31 to output an audio signal related to the sound acquired by the microphone unit 39.
　ヘッドユニット１には、複数のスピーカ３Ｅが接続されている。複数のスピーカ３Ｅにおけるそれぞれの無線通信部３１は、ヘッドユニット１にオーディオ信号を送信する（Ｓ１２）。ヘッドユニット１は、オーディオ信号を受信する（Ｓ２１）。ヘッドユニット１は、受信したオーディオ信号を接続されている他のスピーカ３Ｅに送信する（Ｓ２２）。 A plurality of speakers 3E are connected to the head unit 1. Each wireless communication unit 31 in the plurality of speakers 3E transmits an audio signal to the head unit 1 (S12). The head unit 1 receives an audio signal (S21). The head unit 1 transmits the received audio signal to another connected speaker 3E (S22).
　他のスピーカ３Ｅは、ヘッドユニット１から送信されたオーディオ信号を受信する（Ｓ１３１）。ＣＰＵ３２は、無線通信部３１で受信したオーディオ信号に基づいて、スピーカユニット３８から放音させる（Ｓ１４１）。 The other speaker 3E receives the audio signal transmitted from the head unit 1 (S131). The CPU 32 causes the speaker unit 38 to emit sound based on the audio signal received by the wireless communication unit 31 (S141).
　これにより、あるスピーカ３Ｅで収音された利用者の音声は、他のスピーカ３Ｅのスピーカユニット３８から放音される。したがって、図１１の例では、運転席のシート１０ＦＲに座る利用者（運転者）と、後部座席のシート１０Ｒの左側に座る利用者と、の間で互いの発話音声を聞くことができ、快適な会話を行なうことができる。 Thereby, the user's voice collected by a certain speaker 3E is emitted from the speaker unit 38 of the other speaker 3E. Therefore, in the example of FIG. 11, the user (driver) sitting on the seat 10FR in the driver's seat and the user sitting on the left side of the seat 10R on the rear seat can hear each other's speech, which is comfortable. Can have a good conversation.
　なお、この例では、ヘッドユニット１を介して、複数のスピーカ３Ｅの間で、オーディオ信号を送受信する例を示したが、複数のスピーカ３Ｅの間で、直接オーディオ信号を送受信してもよい。 In this example, the audio signal is transmitted and received between the plurality of speakers 3E via the head unit 1. However, the audio signal may be transmitted and received directly between the plurality of speakers 3E.
　次に、ヘッドユニット１またはスピーカ３を含む音響システムが行なう、信号処理の一例について説明する。 Next, an example of signal processing performed by the sound system including the head unit 1 or the speaker 3 will be described.
　例えば、運転席のシート１０ＦＲおよび助手席のシート１０ＦＬは、自動車のエンジンに近い。そのため、ヘッドユニット１は、エンジン音の周波数特性に応じて、再生音がエンジン音にマスキングされないように、再生音の周波数特性を調整する。例えば、高音領域（例えば４ｋＨｚ以上）においてエンジン音のレベルが高い場合、ヘッドユニット１は、エンジン音により高音がマスキングされないようにするため、再生音の高音のレベルを高くする。また、二列目のシート１０Ｃおよび三列目シートのシート１０Ｒは、エンジン音は目立たないが、ロードノイズ等の外乱音が目立つ場合がある。そのため、ヘッドユニット１は、ロードノイズ等の外乱音の周波数特性に応じて、再生音が外乱音にマスキングされないように、再生音の周波数特性を調整する。例えば、中音領域（例えば５００～４ｋＨｚ以上）において外乱音のレベルが高い場合、ヘッドユニット１は、外乱音により中音がマスキングされないようにするため、再生音の中音のレベルを高くする。 For example, the driver's seat 10FR and the passenger's seat 10FL are close to the engine of a car. Therefore, the head unit 1 adjusts the frequency characteristic of the reproduced sound according to the frequency characteristic of the engine sound so that the reproduced sound 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 of the reproduction sound so that the high sound is not masked by the engine sound. In the second row seat 10C and the third row seat 10R, the engine noise may not be noticeable, but disturbance noise such as road noise may be noticeable. Therefore, the head unit 1 adjusts the frequency characteristic of the reproduced sound so that the reproduced sound is not masked by the disturbance sound according to the frequency characteristic of the disturbance sound such as road noise. 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 of the reproduction sound so that the middle sound is not masked by the disturbance sound.
　スピーカ３が設置された位置（すなわち、利用者の位置）は、例えば、マイク（スピーカ３Ｅのマイクユニット３９）および車内に固定されたスピーカ（不図示）を用いることで測定することができる。 The position where the speaker 3 is installed (that is, the position of the user) can be measured, for example, by using a microphone (the microphone unit 39 of the speaker 3E) and a speaker (not shown) fixed in the car.
　ヘッドユニット１は、車内に固定された各スピーカ（以下、固定スピーカと称する。）から測定音を出力する。ヘッドユニット１は、測定音を出力した時刻を記録する。マイクユニット３９は、測定音を取得する。スピーカ３Ｅは、マイクユニット３９で測定音を取得した時刻を記録する。 The head unit 1 outputs a measurement sound from each speaker fixed in the car (hereinafter, referred to as fixed speaker). The head unit 1 records the time when the measurement sound is output. The microphone unit 39 acquires a measurement sound. The speaker 3E records the time when the microphone unit 39 acquires the measurement sound.
　スピーカ３Ｅは、測定音を取得した時刻情報を、ヘッドユニット１に送信する。ヘッドユニット１は、測定音を出力してからマイクで該測定音が取得されるまでの時間差から、固定スピーカとスピーカ３Ｅとの距離を測定する。ヘッドユニット１は、複数の固定スピーカから測定音を出力し、距離の測定を繰り返すことで、複数の固定スピーカとスピーカ３Ｅとの距離を測定する。ヘッドユニット１は、３つの固定スピーカで測定を行なうと、スピーカ３Ｅの位置を一意に求めることができる。ヘッドユニット１は、車内の各固定スピーカの配置を例えばヘッドユニット１を原点とする直交座標系にプロットすることで、スピーカ３Ｅの車内の位置（座標）を測定することができる。 The speaker 3E transmits, to the head unit 1, time information when the measurement sound is acquired. The head unit 1 measures the distance between the fixed speaker and the speaker 3E from the time difference between the output of the measurement sound and the acquisition of the measurement sound by the microphone. The head unit 1 outputs measurement sound from the plurality of fixed speakers, and repeats the measurement of the distance to measure the distance between the plurality of fixed speakers and the speaker 3E. The head unit 1 can uniquely determine the position of the speaker 3E when the measurement is performed with the three fixed speakers. The head unit 1 can measure the position (coordinates) of the speaker 3E in the car by plotting the arrangement of the fixed speakers in the car on a Cartesian coordinate system with the head unit 1 as an origin, for example.
　ヘッドユニット１は、位置情報を取得すると、該位置情報に基づいて、スピーカ３Ｅに供給するオーディオ信号の音量バランスまたは周波数特性の調整等を行なう。例えば、ヘッドユニット１は、運転席にスピーカ３Ｅが設置されている旨の位置情報を取得した場合、スピーカユニット３８から出力される音がエンジン音にマスキングされないように、周波数特性を調整する。 When the head unit 1 acquires position information, it adjusts the volume balance or frequency characteristics of the audio signal supplied to the speaker 3E based on the position information. For example, when the head unit 1 acquires position information to the effect that the speaker 3E is installed at the driver's seat, the head unit 1 adjusts the frequency characteristic such that the sound output from the speaker unit 38 is not masked by the engine sound.
　エンジン音及び外乱音等の周波数特性は、予め運転席および助手席等の各位置において測定しておいてもよいし、マイクユニット３９で実際の音を取得することで周波数特性を取得してもよい。また、ヘッドユニット１は、エンジン回転数又は車速に応じて、周波数特性を推定してもよい。この場合、ヘッドユニット１は、車両のＯＢＤ（On-board diagnostics）コネクタに接続され、エンジン回転数または車速の情報を取得する。そして、ヘッドユニット１は、予めエンジン回転数または車速の情報に、ノイズ音の周波数特性を対応付けて、ＲＯＭ１５等の記憶媒体に記憶しておく。ヘッドユニット１は、取得した現在のエンジン回転数または車速の情報で、ノイズ音の周波数特性を読み出して、オーディオ信号の周波数特性を調整する。 The frequency characteristics of the engine sound and the disturbance sound may be measured in advance at each position such as the driver's seat and the front passenger seat, or even if the microphone unit 39 acquires an actual sound to acquire the frequency characteristic. Good. In addition, the head unit 1 may estimate frequency characteristics 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. Then, the head unit 1 stores the information on the engine rotational speed or the vehicle speed in advance in the storage medium such as the ROM 15 in association with the frequency characteristic of the noise sound. The head unit 1 reads the frequency characteristic of the noise sound based on the acquired information on the current engine rotational speed or vehicle speed, and adjusts the frequency characteristic of the audio signal.
　また、ヘッドユニット１は、さらに、利用者が車両の窓を開けた場合、ドアを明けた場合、エンジンを停止した場合、またはエンジンを起動した場合、等に応じて、自動的に入力音の音量を下げたり、ミュートしたりすることを位置毎に異なる設定とすることも可能である。 In addition, when the user opens the window of the vehicle, opens the door, stops the engine, starts the engine, or the like, the head unit 1 automatically receives an input sound. It is also possible to set the volume down and mute different settings for each position.
　なお、以上の様な信号処理は、ヘッドユニット１ではなく、スピーカ３におけるＤＳＰ３５において行なうこともできる。 The signal processing as described above can also be performed by the DSP 35 in the speaker 3 instead of the head unit 1.
　次に、図１４は、オーディオ信号の処理の他の例（応用例２）として、仮想定位処理を行なう場合の、車内の模式的な平面図である。応用例２に係る音響システムは、ヘッドユニット１またはスピーカ３Ｅにおいて、聴取者の周囲の所定の位置に音像を仮想定位させる処理を行なう。仮想定位は、頭部伝達関数（ＨＲＴＦ：Head-Related Transfer Function）により行なう。頭部伝達関数は、音源位置と聴者の耳との間の伝達関数を示す。頭部伝達関数は、ある位置に設置した仮想スピーカ３８からそれぞれ左右の耳に至る音の大きさ、到達時間、および周波数特性等を表現したインパルス応答である。ヘッドユニット１は、利用者が映画のコンテンツを視聴している場合において、センタチャンネルのオーディオ信号に、モニタ２０の位置から左右の耳に至る頭部伝達関数を付与する。頭部伝達関数による仮想定位は、ユーザがヘッドフォンを用いる場合に好適である。 Next, FIG. 14 is a schematic plan view of the inside of a vehicle in the case of performing virtual localization processing as another example (application example 2) of audio signal processing. The sound system according to the application example 2 performs a process of virtually localizing a sound image at a predetermined position around the listener in the head unit 1 or the speaker 3E. The virtual localization is performed by head-related transfer function (HRTF). The head-related transfer function indicates the transfer function between the sound source position and the listener's ear. The head-related transfer function is an impulse response that expresses the magnitude, the arrival time, the frequency characteristic, and the like of the sound from the virtual speaker 38 installed at a certain position to each of the left and right ears. The head unit 1 adds a head-related transfer function from the position of the monitor 20 to the left and right ears to the audio signal of the center channel when the user is watching the movie content. The virtual localization by the head related transfer function is suitable when the user uses headphones.
　次に、応用例３に係る信号処理を説明する。応用例３に係る音響システムは、ヘッドユニット１またはスピーカ３において、サウンドマスキング処理を行なう。ヘッドユニット１は、車内の特定のユーザ（例えば運転者）に対して、マスカ音を出力する。例えば、二列目のシート１０Ｃまたは三列目のシート１０Ｒにユーザがいる場合に、運転席のスピーカ３から、内容を理解できないようにするマスカ音を出力する。マスカ音は、マスキング対象となる音声を撹乱する撹乱音と、連続的に発生する背景音と、断続的に発生する演出音と、からなることが好ましい。撹乱音は、例えば、人の音声を時間軸上あるいは周波数軸上で改変し、語彙的に何ら意味をなさない（内容が理解できない）ようにしたものである。背景音は、例えば小川のせせらぎや木々のざわめき等、聴取者が注目し難く、不快感のない音である。演出音は、断続的に発生する楽音等の演出性の高い音である。演出音は、聴取者の注意を向けさせ、聴覚心理的に撹乱音の違和感を目立たなくする。これらの撹乱音、背景音、および演出音を組み合わせたマスカ音を運転者に聴取させることで、後部座席のユーザの会話内容をマスクしつつ、運転者の不快感を低減することが可能となる。 Next, signal processing according to application example 3 will be described. The sound system according to the application example 3 performs a sound masking process in the head unit 1 or the speaker 3. The head unit 1 outputs a masking sound to a specific user (for example, a driver) in the vehicle. For example, when the user is in the second row seat 10C or the third row seat 10R, the speaker 3 of the driver's seat outputs a masker sound that makes the content incomprehensible. 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 disturbance sound is, for example, one in which human voice is modified on a time axis or a frequency axis so that it does not make any lexical meaning (the content can not be understood). The background sound is a sound that is difficult for the listener to pay attention to, such as, for example, a stream of a stream or a sway of trees, and that there is no discomfort. The effect sound is a sound with high effect such as musical tones generated intermittently. The directing sound directs the listener's attention, and makes the sense of incongruence of disturbed sound inconspicuous in auditory-psychologically. By making the driver listen to the mascara sound combining the disturbing sound, the background sound, and the directing sound, it is possible to reduce the driver's discomfort while masking the conversation content of the user of the rear seat. .
　これにより、例えばタクシー等の乗客は、運転者に会話内容を聞かれないようにすることができる。また、運転者の不快感は低減される。 Thus, for example, a passenger such as a taxi can prevent the driver from hearing the conversation contents. Also, the driver's discomfort is reduced.
　図１５は、応用例４に係る信号処理を説明するための、車内の模式的な平面図である。応用例４に係る信号処理は、コンサートホール等の音響空間で発生する反射音を模擬した擬似反射音５０１を再生することで、車内にいながらにして実際のコンサートホール等の別の空間に居るような臨場感を聴取者に体感させるものである。 FIG. 15 is a schematic plan view of the interior of a vehicle for illustrating signal processing according to Application Example 4. The signal processing according to the application example 4 reproduces a pseudo reflection sound 501 simulating a reflection sound generated in an acoustic space such as a concert hall, so that the user can be in a car but in another space such as an actual concert hall. It makes listeners feel the feeling.
　ヘッドユニット１は、ユーザが選択した音響空間（例えばコンサートホール）に対応するインパルス応答をオーディオ信号に畳み込む。ヘッドユニット１は、各スピーカ３の酢複数のスピーカユニット３８に供給する信号のゲイン比率および遅延量を変化させることで、図１５に示すように、複数の位置に擬似反射音５０１を生成する。 The head unit 1 convolutes an impulse response corresponding to an acoustic space (for example, a concert hall) selected by the user into an audio signal. The head unit 1 changes the gain ratio and the delay amount of the signal supplied to the plurality of vinegar speaker units 38 of each speaker 3 to generate the pseudo reflected sound 501 at a plurality of positions as shown in FIG.
　なお、スピーカ３は、ＬＥＤ等の照明機能を備えていてもよい。この場合、利用者は、スピーカ３を取り外して、野外の照明（例えばキャンプ場におけるランタン）として用いることができる。また、スピーカ３は、オーディオソースに応じて、照明の色または照度等を変更してもよい。例えばアップテンポの曲を再生している場合には、照明の色を明るく、高い照度に設定する。 The speaker 3 may have an illumination function such as an LED. In this case, the user can remove the speaker 3 and use it as outdoor lighting (for example, a lantern in a campsite). In addition, the speaker 3 may change the color or illuminance of illumination according to the audio source. For example, when playing an up-tempo song, the color of the illumination is set to be bright and high illumination.
　次に、ヘッドユニット１またはスピーカ３Ｅにおいて、各種の情報処理を行なう場合の例について説明する。
　（１）人工知能による案内
　ヘッドユニット１またはスピーカ３Ｅは、ＣＰＵにより人工知能（例えばニューラルネットワーク）の処理を行なう。例えば、ニューラルネットワークは、複数のニューロンを有し、各ニューロンにおいて、入力に対して所定の値を出力する。出力値は、教師あり学習かまたは機械学習により修正する。機械学習では、判断要素をさらに細分化した深層学習を行なってもよい。この例では、ヘッドユニット１またはスピーカ３Ｅは、マイクから利用者の音声を入力して、音声認識を行ない、利用者の質問に対する回答を行なう。例えば、利用者が「近くの駐車場を探して」と発言した場合に、ヘッドユニット１またはスピーカ３Ｅは、「近く」、「駐車場」、および「探して」等の音声認識を行ない、入力値として処理する。ニューラルネットワークでは、これらの認識結果から、回答を導き出す。そして、ヘッドユニット１またはスピーカ３Ｅは、導き出した回答を、スピーカユニット３８から音声として出力する。これにより、ヘッドユニット１またはスピーカ３Ｅは、利用者の質問に対する案内を行なう。 Next, an example of performing various information processing in the head unit 1 or the speaker 3E will be described.
(1) Guidance by Artificial Intelligence The head unit 1 or the speaker 3E performs artificial intelligence (for example, neural network) processing by the CPU. For example, a neural network has a plurality of neurons, and each neuron outputs a predetermined value to an input. The output value is corrected by supervised learning or machine learning. In machine learning, deep learning in which judgment elements are further subdivided may be performed. In this example, the head unit 1 or the speaker 3E receives the user's voice from the microphone, performs voice recognition, and answers the user's question. For example, when the user says "search for a nearby parking lot", the head unit 1 or the speaker 3E performs speech recognition such as "near", "parking lot", and "finding", and inputs Treat as a value. The neural network derives an answer from these recognition results. Then, the head unit 1 or the speaker 3E outputs the derived answer as sound from the speaker unit 38. Thus, the head unit 1 or the speaker 3E guides the user's question.
　本実施形態のスピーカ３Ｅは、マイクユニット３９が利用者毎に設けられるため、利用者毎に異なる質問を受け付けることができ、利用者毎に異なる案内を行なうことができる。 In the speaker 3E of the present embodiment, the microphone unit 39 is provided for each user, so that different questions can be received for each user, and different guidance can be provided for each user.
　なお、ヘッドユニット１がカーナビゲーションシステムと接続されている場合には、ヘッドユニット１は、現在の位置と、目的の位置とに基づいて、目的の位置までの所要時間に係る情報を取得してもよい。 When the head unit 1 is connected to a car navigation system, the head unit 1 acquires information related to the required time to the target position based on the current position and the target position. It is also good.
　また、スピーカユニット３８から出力する発話音声は、周囲のノイズ等の外乱音に応じて、周波数特性を調整し、利用者が聞き取り易い音声に調整してもよい。 In addition, the speech sound output from the speaker unit 38 may be adjusted to a sound that the user can easily hear by adjusting the frequency characteristic according to the disturbance sound such as the surrounding noise.
　なお、ヘッドユニット１またはスピーカ３Ｅは、人工知能ではなく、例えばコールセンタに電話をかけ、オペレータが案内することも可能である。この場合、ヘッドユニット１またはスピーカ３Ｅは、移動体通信網に接続する機能を有するか、携帯電話等の移動体通信網に接続する機器を介して、コールセンタに電話をかける。 Note that the head unit 1 or the speaker 3E is not artificial intelligence, and for example, it is possible to call a call center and to be guided by the operator. In this case, the head unit 1 or the speaker 3E makes a call to the call center via a device connected to the mobile communication network or a device connected to the mobile communication network such as a mobile phone.
　（２）翻訳
　ヘッドユニット１またはスピーカ３Ｅは、ＣＰＵにより翻訳処理を行なう。ヘッドユニット１またはスピーカ３Ｅは、音声認識を行なう。ヘッドユニット１またはスピーカ３Ｅは、認識した音声の使用言語を判定して、異なる言語に翻訳する。翻訳対象の言語は、予め設定されている。なお、ヘッドユニット１またはスピーカ３Ｅは、人工知能を用いた翻訳を行なってもよい。 (2) Translation The head unit 1 or the speaker 3E performs translation processing by the CPU. The head unit 1 or the speaker 3E performs voice recognition. The head unit 1 or the speaker 3E determines the used language of the recognized voice and translates it into a different language. The language to be translated is preset. The head unit 1 or the speaker 3E may perform translation using artificial intelligence.
　例えば、運転者が日本語で発話すると、運転席のヘッドレスト５ＦＲに設置されたスピーカ３Ｅのマイクユニット３９が、当該音声をヘッドユニット１に送信する。ヘッドユニット１は、入力された日本語の音声を解析して、英語に翻訳する。ヘッドユニット１は、対応する英語の音声に係るオーディオ信号を生成する。ヘッドユニット１は、生成したオーディオ信号を、後部座席のヘッドレストに設置されたスピーカ３Ｅに送信する。後部座席のヘッドレストに設置されたスピーカ３Ｅは、受信したオーディオ信号に基づいて、英語の音声を放音する。 For example, when the driver speaks in Japanese, the microphone unit 39 of the speaker 3E installed in the headrest 5FR of the driver's seat transmits the voice to the head unit 1. The head unit 1 analyzes the input Japanese speech and translates it into English. The head unit 1 generates an audio signal according to the corresponding English voice. The head unit 1 transmits the generated audio signal to the speaker 3E installed in the headrest of the rear seat. The speaker 3E installed in the headrest of the rear seat emits English sound based on the received audio signal.
　これにより、例えば日本人のタクシーの運転者と、後部座席の外国人の乗客との間で、円滑な会話を行なうことができる。 This enables smooth conversation, for example, between a Japanese taxi driver and a foreign passenger in the back seat.
　また、上述の（１）人工知能による案内、に係る案内音声も、所定の言語に翻訳して、スピーカ３Ｅから出力してもよい。 Further, the guidance voice according to the above-mentioned guidance by (1) artificial intelligence may be translated into a predetermined language and output from the speaker 3E.
　本実施形態の技術思想は、以下の様になる。
（１）
　頭部に接触するヘッドレストの支柱に取り付けられる筐体と、
　前記筐体に設けられたスピーカユニットと、
　を備えたヘッドレスト用スピーカ。
（２）
　上記（１）において、
　前記筐体は、前記支柱が挿入される孔を有する、
　ヘッドレスト用スピーカ。 The technical concept of this embodiment is as follows.
(1)
A housing attached to the headrest support that contacts the head;
A speaker unit provided in the housing;
Headrest speaker with.
(2)
In the above (1),
The housing has a hole into which the post is inserted.
Headrest speaker.
（３）
　上記（１）において、
　前記筐体は、前記支柱を挟み込む切り欠き部を有する、
　ヘッドレスト用スピーカ。 (3)
In the above (1),
The housing has a notch for holding the post.
Headrest speaker.
（４）
　上記（３）において、
　前記切り欠き部は、平面視してＬ字型の形状である、
　請求項３に記載のヘッドレスト用スピーカ。 (4)
In (3) above,
The cutaway portion is L-shaped in plan view.
The headrest speaker according to claim 3.
（５）
　上記（１）乃至（４）のいずれかにおいて、
　前記スピーカユニットは、前記筐体において内向きに設けられている、
　ヘッドレスト用スピーカ。 (5)
In any of the above (1) to (4),
The speaker unit is provided inward in the housing.
Headrest speaker.
（６）
　上記（１）乃至（５）のいずれかにおいて、
　前記スピーカユニットは、前記筐体において上向きに設けられている、
　ヘッドレスト用スピーカ。 (6)
In any of the above (1) to (5),
The speaker unit is provided upward in the housing.
Headrest speaker.
（７）
　上記（１）乃至（６）のいずれかにおいて、
　前記スピーカユニットは、前記ヘッドレストを振動させて、前記ヘッドレストの振動により、音を利用者に伝達させる、
　ヘッドレスト用スピーカ。 (7)
In any of the above (1) to (6),
The speaker unit vibrates the headrest to transmit sound to the user by the vibration of the headrest.
Headrest speaker.
（８）
　上記（１）乃至（７）のいずれかにおいて、
　前記筐体の端部に配置される無線通信部を備えた、
　ヘッドレスト用スピーカ。 (8)
In any of the above (1) to (7),
A wireless communication unit disposed at an end of the housing;
Headrest speaker.
（９）
　頭部に接触するヘッドレストの側面から外向きに配置されたスピーカユニットと、
　前記スピーカユニットから出力された音を反射する開閉自在の反射板と、
　を備えたヘッドレスト用スピーカ。 (9)
A speaker unit disposed outward from the side of the headrest in contact with the head;
An openable reflector which reflects the sound output from the speaker unit;
Headrest speaker with.
（１０）
　頭部に接触するヘッドレストを挟み込むヘッドバンドと、
　前記ヘッドバンドの端部において、前記ヘッドレストに対して内向きに取り付けられ、前記ヘッドレストに接触するスピーカユニットと、
　を備えたヘッドレスト用スピーカ。 (10)
A headband that holds the headrest in contact with the head;
A speaker unit attached inward to the headrest at an end of the headband and in contact with the headrest;
Headrest speaker with.
（１１）
　上記（１）乃至（１０）のいずれかにおいて、
　マイクをさらに備えた、
　ヘッドレスト用スピーカ。 (11)
In any of the above (1) to (10),
Further equipped with a microphone,
Headrest speaker.
（１２）
　上記（１）乃至（１１）のいずれかにおいて、
　オーディオ信号に所定の信号処理を施す信号処理部を備えた、
　ヘッドレスト用スピーカ。 (12)
In any of the above (1) to (11),
A signal processing unit that performs predetermined signal processing on the audio signal;
Headrest speaker.
（１３）
　上記（１）乃至（１２）のいずれかに記載のヘッドレスト用スピーカと、
　前記ヘッドレスト用スピーカにオーディオ信号を供給するヘッドユニットと、
　を備えた音響システム。 (13)
The headrest speaker according to any one of the above (1) to (12);
A head unit for supplying an audio signal to the headrest speaker;
Acoustic system equipped with
１…ヘッドユニット
３，３Ａ，３Ｂ，３Ｃ，３Ｄ，３Ｅ…スピーカ
５Ｃ，５ＣＬ，５ＣＲ，５ＦＬ，５ＦＲ，５Ｒ，５ＲＬ，５ＲＲ，５ＲＬ，５ＲＲ…ヘッ１０Ｃ，１０ＦＬ，１０ＦＲ，１０Ｒ…シート
１２…無線通信部
１４…ＣＰＵ
１５…ＲＯＭ
１６…ＲＡＭ
１７…ＤＳＰ
１８…入力Ｉ／Ｆ
１９…音源
２０…モニタ
２１…ミキサ
２２…出力Ｉ／Ｆ
３１…無線通信部
３２…ＣＰＵ
３３…ＲＯＭ
３４…ＲＡＭ
３５…ＤＳＰ
３６…Ｄ／Ａコンバータ
３７…アンプ
３８，３８Ｃ，３８ＦＲ…スピーカユニット
３９ＦＲ…反射板
５１，５１Ａ，５１Ｂ…筐体
５１Ｃ…ヘッドバンド
５２…孔
１００…支柱
２００，３００…バス
３００…バス 1 Head unit 3, 3A, 3B, 3C, 3D, 3E Speaker 5C, 5CL, 5CR, 5FL, 5FR, 5R, 5RL, 5RR, 5RR ... Head 10C, 10FL, 10FR, 10R ... Sheet 12 ... Wireless Communication unit 14 ... CPU
15: ROM
16: RAM
17: DSP
18: Input I / F
19 ... sound source 20 ... monitor 21 ... mixer 22 ... output I / F
31 ... wireless communication unit 32 ... CPU
33: ROM
34 ... RAM
35 ... DSP
36 D / A converter 37 Amp 38, 38C, 38FR Speaker unit 39FR Reflector 51 51A 51B Casing 51C Headband 52 Hole 100 Support 200, 300 Bus 300 Bus 300

Claims (6)

  1. 　頭部に接触するヘッドレストの支柱に取り付けられる筐体と、
    　前記筐体に設けられたスピーカユニットと、
    　を備えたヘッドレスト用スピーカ。     A housing attached to the headrest support that contacts the head;
    A speaker unit provided in the housing;
    Headrest speaker with.
  2. 　前記筐体は、前記支柱が挿入される孔を有する、
    　請求項１に記載のヘッドレスト用スピーカ。     The housing has a hole into which the post is inserted.
    The headrest speaker according to claim 1.
  3. 　前記筐体は、前記支柱を挟み込む切り欠き部を有する、
    　請求項１に記載のヘッドレスト用スピーカ。     The housing has a notch for holding the post.
    The headrest speaker according to claim 1.
  4. 　前記切り欠き部は、平面視してＬ字型の形状である、
    　請求項３に記載のヘッドレスト用スピーカ。     The cutaway portion is L-shaped in plan view.
    The headrest speaker according to claim 3.
  5. 　頭部に接触するヘッドレストの側面から外向きに配置されたスピーカユニットと、
    　前記スピーカユニットから出力された音を反射する開閉自在の反射板と、
    　を備えたヘッドレスト用スピーカ。     A speaker unit disposed outward from the side of the headrest in contact with the head;
    An openable reflector which reflects the sound output from the speaker unit;
    Headrest speaker with.
  6. 　頭部に接触するヘッドレストを挟み込むヘッドバンドと、
    　前記ヘッドバンドの端部において、前記ヘッドレストに対して内向きに取り付けられ、前記ヘッドレストに接触するスピーカユニットと、
    　を備えたヘッドレスト用スピーカ。     A headband that holds the headrest in contact with the head;
    A speaker unit attached inward to the headrest at an end of the headband and in contact with the headrest;
    Headrest speaker with.
PCT/JP2017/030552 2017-08-25 2017-08-25 Speaker for headrest WO2019038915A1 (en)

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WO2020230462A1 (en) * 2019-05-13 2020-11-19 ソニー株式会社 Acoustic reflector, speaker unit, and chair
WO2022045258A1 (en) * 2020-08-31 2022-03-03 テイ・エス テック株式会社 Headrest

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JPS59151912A (en) * 1983-02-18 1984-08-30 富士重工業株式会社 Seat for vehicle
JP2000323853A (en) * 1999-05-12 2000-11-24 Teruki Fujiyama On-board electric apparatus and its mounting method
JP2005161898A (en) * 2003-11-28 2005-06-23 Sony Corp Speaker system

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Publication number Priority date Publication date Assignee Title
JPS59151912A (en) * 1983-02-18 1984-08-30 富士重工業株式会社 Seat for vehicle
JP2000323853A (en) * 1999-05-12 2000-11-24 Teruki Fujiyama On-board electric apparatus and its mounting method
JP2005161898A (en) * 2003-11-28 2005-06-23 Sony Corp Speaker system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020230462A1 (en) * 2019-05-13 2020-11-19 ソニー株式会社 Acoustic reflector, speaker unit, and chair
US20220225018A1 (en) * 2019-05-13 2022-07-14 Sony Group Corporation Acoustic reflector, speaker unit, and chair
US11950049B2 (en) 2019-05-13 2024-04-02 Sony Group Corporation Acoustic reflector, speaker unit, and chair
WO2022045258A1 (en) * 2020-08-31 2022-03-03 テイ・エス テック株式会社 Headrest

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