WO2021010280A1 - Système de haut-parleur et véhicule - Google Patents

Système de haut-parleur et véhicule Download PDF

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Publication number
WO2021010280A1
WO2021010280A1 PCT/JP2020/026862 JP2020026862W WO2021010280A1 WO 2021010280 A1 WO2021010280 A1 WO 2021010280A1 JP 2020026862 W JP2020026862 W JP 2020026862W WO 2021010280 A1 WO2021010280 A1 WO 2021010280A1
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WO
WIPO (PCT)
Prior art keywords
sound absorbing
sound
absorbing structure
room
standing wave
Prior art date
Application number
PCT/JP2020/026862
Other languages
English (en)
Japanese (ja)
Inventor
本地　由和
内田　勝也
三木　晃
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 CN202080050392.6A priority Critical patent/CN114097252A/zh
Publication of WO2021010280A1 publication Critical patent/WO2021010280A1/fr

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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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B60R11/0217—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • 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
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R2011/0001—Arrangements for holding or mounting articles, not otherwise provided for characterised by position
    • B60R2011/0003—Arrangements for holding or mounting articles, not otherwise provided for characterised by position inside the vehicle
    • B60R2011/0036—Luggage compartment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups

Definitions

  • the present invention relates to a speaker system and a vehicle equipped with the speaker system.
  • Patent Document 1 In a vehicle provided with a passenger compartment and a trunk compartment, a vehicle in which a sound absorbing structure is arranged in the trunk compartment as described in Patent Document 1 is known for the purpose of reducing noise in the passenger compartment. There is.
  • the sound absorbing structure of Patent Document 1 reduces road noise generated from tires and standing waves in a trunk room.
  • One of the problems to be solved in this disclosure is to provide a technology capable of improving the sound environment in a space partitioned into two rooms by a partition member in which a speaker is installed.
  • the speaker system is attached to a partition member that divides a closed space into a first chamber and a second chamber, and outputs sound toward the first chamber. It includes a speaker and a sound absorbing structure provided in the first chamber or the second chamber and absorbing sound caused by a standing wave generated in the closed space.
  • FIG. 7 is a cross-sectional view taken along the line EE of FIG. It is a figure which shows the sound pressure distribution of the primary standing wave in the vehicle interior before and after the sound absorption structure is provided.
  • It is a side view which shows another example of arrangement of the sound absorbing structure composed of a tube sound absorbing body. It is a side view which shows still another example of arrangement of the sound absorbing structure composed of a tube sound absorbing body.
  • FIG. 5 is a side view showing still another example of the arrangement of a sound absorbing structure composed of a Helmholtz resonator. It is sectional drawing which shows another example of a Helmholtz resonator. FIG. 5 is a cross-sectional view showing still another example of a Helmholtz resonator. It is a side view which shows an example of the room to which the speaker system of this disclosure is applied together with the waveform of the primary standing wave. It is a figure which shows the distribution of the sound pressure of the primary standing wave in the room before and after the sound absorption structure is provided in the room shown in FIG.
  • FIG. 1 is a side view showing a vehicle provided with a speaker system according to an embodiment of the present disclosure.
  • the vehicle 1 has a closed space 9.
  • the closed space 9 is simply referred to as "space 9".
  • the space 9 has a vehicle compartment 2 which is an example of the first room and a trunk room 3 which is an example of the second room.
  • the passenger compartment 2 is a space for accommodating people.
  • a front seat 5a and a rear seat 5b are installed in the passenger compartment 2.
  • the space 9 is divided into a passenger compartment 2 and a trunk compartment 3 by a rear seat 5b and a rear tray 6 on the back surface thereof. That is, the rear seat 5b and the rear tray 6 serve as partition members for partitioning the space 9 into the vehicle interior 2 and the trunk compartment 3.
  • the speaker 7 is attached to the rear tray 6 with the sound emitting surface of the speaker 7 facing the passenger compartment 2.
  • the speaker 7 outputs sound toward the vehicle interior 2.
  • the speaker 7 is a speaker for reproducing low-pitched sound, and is referred to as a woofer unit or a subwoofer unit.
  • the rear tray 6 may be equipped with either or both of a mid-range sound reproduction speaker and a high-frequency sound reproduction speaker. Armrests 5c are provided between the left and right seats of the rear seats 5b.
  • the space 9 is divided into a passenger compartment 2 and a trunk compartment 3 by a rear seat 5b and a rear tray 6. Therefore, the trunk room 3 acts as a cabinet that forms a space behind the speaker 7. Normally, the passenger compartment 2 and the trunk compartment 3 are independent spaces. Therefore, standing waves due to the size of the respective spaces are generated in each of the passenger compartment 2 and the trunk compartment 3. However, if the rear tray 6 is arranged with a speaker 7 for reproducing a low-frequency sound having a larger diameter than a speaker for reproducing a mid-range sound and a speaker for reproducing a high-frequency sound, the speaker 7 The passenger compartment 2 and the trunk compartment 3 are acoustically connected via the diaphragm.
  • the reproduction frequency band of the speaker 7 includes the frequency of the primary standing wave among the frequencies of the standing wave.
  • the reproduction frequency band means the effective frequency range specified in the Japan Electronics and Information Technology Industries Association standard JEITA RC-8124C "speaker system".
  • the standing wave shown in FIG. 3 is generated in the space 9 from the front end 2a of the passenger compartment 2 to the rear end 3a of the trunk room 3.
  • the front end 2a and the rear end 3a are examples of the two ends of the space 9.
  • the primary standing wave having the lowest frequency is the length in the front-rear direction of the space 9 (between the front end portion 2a and the rear end portion 3a) in the case of a general vehicle. It has a wavelength (1 wavelength) twice as long as (distance) L.
  • the frequency of this primary standing wave is about 60 Hz when the length L of the space 9 is 2.83 m.
  • the frequency of the primary standing wave is the fundamental frequency of the standing wave.
  • FIG. 4 is a diagram showing the relationship between the sound pressure at the rear end 3a of the trunk room 3 and the frequencies of the primary, secondary, and tertiary standing waves. Not only when the primary standing wave (60Hz) is generated, but also when the secondary standing wave (120Hz) is generated and when the tertiary standing wave (180Hz) is generated, at the rear end 3a of the trunk room 3. The sound pressure of is the highest. The sound pressure at the front end 2a of the passenger compartment 2 is also the highest when a standing wave is generated, similarly to the sound pressure at the rear end 3a of the trunk room 3.
  • FIG. 5 is a graph showing the relationship between the sound pressure at the point 5a1 (see FIGS. 1 and 3) of the front seat 5a and the frequency of the standing wave.
  • the sound pressure changes according to the frequency of the standing wave (60 Hz, 120 Hz, 180 Hz).
  • the sound pressure of the sound output from the speaker 7 becomes extremely high or low at a specific position in the vehicle interior 2.
  • the primary standing wave greatly affects the change in sound pressure.
  • the sound absorbing structure 10A is attached to the trunk room 3 in order to suppress the standing wave, as shown in FIG.
  • the sound absorbing structure 10A is an aggregate of tubular sound absorbing bodies 10a to 10i.
  • the number of tube sound absorbers 10a to 10i is not limited to "8".
  • the sound absorbing structure 10A may have one or more tube sound absorbing bodies.
  • Each of the tube sound absorbing bodies 10a to 10i is a closed tube having a closed end portion 10x and an open end portion 10y, as shown in the cross-sectional view of FIG.
  • the closed end 10x is an example of a closed end in a tubular tube sound absorber.
  • the open end portion 10y is an example of the other end of the tubular sound absorbing body that is open.
  • the sound absorbing structure 10A is attached with the open end 10y of the pipe sound absorbing bodies 10a to 10i facing the rear end 3a of the trunk room 3.
  • the sound pressure of the standing wave becomes the highest. Since the sound absorbing structure 10 is attached with the open end 10y facing the rear end 3a, the sound absorbing structure 10A can effectively suppress standing waves.
  • each of the tube sound absorbing bodies 10a to 10i is composed of a closed tube as in this example, the tube sound absorbing bodies 10a to 10i resonate at frequencies of odd-order standing waves. Therefore, the sound absorbing structure 10 can efficiently suppress odd-order standing waves.
  • the length A of the inner space shown in FIG. 8 has a primary standing wave in the space 9, specifically, a frequency f1 (60 Hz).
  • the length shown in Eq. (1) is set so that the standing wave having the wavelength ⁇ ( ⁇ 2 L) resonates with the sound absorbing structure 10A.
  • the resonance frequency f0 of the sound absorbing structure 10A composed of the tube sound absorbing bodies 10a to 10i is substantially equal to the frequency f1 of the primary standing wave. Therefore, when the open end portion 10y of the sound absorbing structure 10A is located near the rear end portion 3a of the trunk room 3, the sound caused by the standing wave is absorbed by the sound absorbing structure 10A. Therefore, as shown in FIG. 9, when the sound absorbing structure 10A is installed, the sound pressure decreases at both ends of the space 9 and increases at the central portion of the space 9. Specifically, the sound pressure at the central portion of the space 9 increases by about 2 dB. That is, since the standing wave is suppressed, the change in sound pressure caused by the standing wave becomes small in the front and rear range in the vehicle in the space 9. As a result, the sound environment is improved, and the sound quality of the sound in the passenger compartment 2, for example, the sound output from the speaker 7 to the passenger compartment 2 is improved.
  • the sound absorbing structure 10A Since the sound absorbing structure 10A is installed in the trunk room 3, standing waves are suppressed. Therefore, in the passenger compartment 2 where a person rides, the sound in the low frequency range such as audio output from the speaker 7 to the passenger compartment 2 is not easily affected by the standing wave. Therefore, the sound environment is improved, and the sound quality of the sound in the passenger compartment 2, for example, the sound output from the speaker 7 to the passenger compartment 2 is improved.
  • the fundamental frequency of the standing wave that is, the frequency f1 of the primary standing wave is close to the resonance frequency f0 of the sound absorbing structure 10A.
  • the frequency f1 of the primary standing wave ranges from the frequency obtained by multiplying the resonance frequency f0 of the sound absorbing structure 10 by 0.9 to the frequency obtained by multiplying the resonance frequency f0 by 1.1. If it is within the range, a relatively good effect of suppressing standing waves can be obtained.
  • the sound absorbing structure 10A is attached to the bottom surface in the trunk room 3. Therefore, the sound absorbing structure 10A having a flat shape as shown in the illustrated example is fixed to the trunk room 3. As a result, the user can easily attach the sound absorbing structure 10A.
  • FIG. 10 shows an example of mounting the sound absorbing structure 10B in the vehicle of the present embodiment.
  • the sound absorbing structure 10B is arranged at a portion corresponding to the rear end of the vehicle 1 in the trunk room 3.
  • the tube sound absorbing body constituting the sound absorbing structure 10B extends in the vertical direction.
  • the sound absorbing structure 10B is attached so that the open end 10y of the pipe sound absorbing body faces the bottom surface of the trunk room 3 at the rear end 3a of the trunk room 3.
  • the sound absorbing structure 10B When the sound absorbing structure 10B is attached to the position corresponding to the rear end of the vehicle 1 in the trunk room 3, the sound absorbing structure 10B is required to have higher rigidity than the configuration in which the sound absorbing structure 10B is provided on the bottom surface of the trunk room 3. There is an advantage that it is not done.
  • the sound absorbing structures 10A, 10B, and 10C are attached independently. However, two or more of the sound absorbing structures 10A, 10B, and 10C may be attached to the vehicle 1.
  • the Helmholtz resonator 14A is a rectangular parallelepiped flat plate-shaped sound absorbing structure composed of a combination of plate materials.
  • the Helmholtz resonator 14A has one or more (three in the illustrated example) resonant air chambers 14a and one or more (three in the illustrated example) neck 14b.
  • the resonance air chamber 14a is an internal space of the hollow member 14a1.
  • the hollow member 14a1 has an opening 14a2.
  • the resonant air chamber 14a has a rectangular parallelepiped shape.
  • the neck 14b is an open tube.
  • the neck 14b corresponds one-to-one with the resonant air chamber 14a.
  • the neck 14b communicates with the opening 14a2 of the corresponding resonant air chamber 14a. Therefore, the outside air can flow into the resonance air chamber 14a through the neck 14b.
  • the neck 14b is an example of a communication portion.
  • the resonance air chamber 14a side is the rear and the neck 14b side is the front.
  • the resonance air chamber 14a (hollow member 14a1) is formed by a bottom plate 15a, an upper plate 15b, a rear plate 15c, side plates 15d and 15e, and a partition plate 15f.
  • the top plate 15b is separated from the bottom plate 15a. There is a space between the bottom plate 15a and the top plate 15b.
  • the rear plate 15c is joined to the bottom plate 15a and the top plate 15b on the rear side of the Helmholtz resonator 14a.
  • the side plate 15d is joined to the bottom plate 15a and the top plate 15b on the left side of the Helmholtz resonator 14a.
  • the side plate 15e is joined to the bottom plate 15a and the top plate 15b on the right side of the Helmholtz resonator 14a.
  • the partition plate 15f extends in the left-right direction of the Helmholtz resonator 14a and is joined to the bottom plate 15a and the top plate 15b at a position between the front and the rear of the Helmholtz resonator 14a.
  • the two partition plates 15f are separated from each other, and the opening 14a2 is formed by the two partition plates 15f.
  • the neck 14b is formed by a bottom plate 15a, an upper plate 15b, and partition plates 15g and 15h.
  • the partition plates 15g and 15h extend from the front of the Helmholtz resonator 14a to the partition plate 15f, and are joined to the bottom plate 15a and the top plate 15b.
  • the resonance frequency f0 of the sound absorbing structure composed of the Helmholtz resonator 14A can be expressed by Eq. (2).
  • c is the speed of sound
  • s is the opening area of the neck 14b
  • V is the volume of the resonance air chamber 14a
  • l is the length of the neck 14b
  • ⁇ is the correction value of the opening end of the neck 14b.
  • the sound absorbing structure composed of the Helmholtz resonator 14A is provided on the bottom surface of the trunk chamber 3 with a ventilation gap between the neck 14b and the rear end portion 3a of the trunk chamber 3. It is attached.
  • the Helmholtz resonator 14A can be configured more compactly than the sound absorbing structures 10A to 10C composed of the tube sound absorbing body. Therefore, the arrangement of the sound absorbing structure becomes easy.
  • the Helmholtz resonator 14B may be attached to the rear end portion 3a in the trunk chamber 3.
  • a Helmholtz resonator 14B may be provided from the bottom surface of the trunk chamber 3 along the rear end 3a of the trunk chamber 3.
  • the neck 14b is located at the rear end 3a of the trunk chamber 3.
  • the Helmholtz resonator 14C may be mounted in front of the driver's seat, which is the front seat 5a.
  • the neck of the Helmholtz resonator 14C may be oriented sideways, and the open end of the neck may be located at the front end 2a of the passenger compartment 2.
  • the Helmholtz resonators 14A, 14B, and 14C are attached independently, but two or more of them may be attached to the vehicle 1.
  • FIG. 17 shows another example of the Helmholtz resonator.
  • the Helmholtz resonator 14D has a rectangular parallelepiped box-shaped resonant air chamber 14a and a neck 14b. The outside air can flow into the resonant air chamber 14a via the neck 14b.
  • the neck 14b has a through hole 14e provided in a thick front plate 14d.
  • FIG. 18 further shows another example of the Helmholtz resonator.
  • the Helmholtz resonator 14E has a rectangular parallelepiped box-shaped resonant chamber 14a and a neck 14b.
  • the neck 14b is composed of a tubular portion 14g provided on the front plate 14d.
  • the Helmholtz resonator 14E also includes one or more resonant air chambers 14ax and one or more necks 14bx on the sides of the Helmholtz resonator 14E.
  • the Helmholtz resonator 14E shown in FIG. 18 includes a plurality of resonant air chambers 14ax and a plurality of necks 14bx.
  • the hollow member 14ax1 having the resonance air chamber 14ax as an internal space has an opening 14ax2 on the side of the Helmholtz resonator 14E, that is, in a direction orthogonal to the direction in which the neck 14b extends.
  • the neck 14bx communicates with the opening 14ax2.
  • the resonance air chamber 14ax is provided for the purpose of suppressing a standing wave or the like having a frequency different from the frequency of the standing wave generated in the space 9 of the vehicle 1.
  • the resonance air chamber 14ax is provided in the trunk room 3 or the passenger compartment 2 in order to suppress a standing wave generated only in the trunk chamber 3 or only the passenger compartment 2, road noise generated in the tires, and the like.
  • the Helmholtz resonator 14E suppresses not only the standing wave of the space 9 composed of the passenger compartment 2 and the trunk compartment 3, but also other standing waves or noise, so that the passenger compartment is further suppressed.
  • the sound environment of 2 can be improved.
  • FIG. 19 is a side view showing an example of a room to which the speaker system of the present disclosure is applied, together with a waveform of a primary standing wave.
  • the room 20 is configured as a small space by a floor portion 21, a ceiling portion 22, front and rear wall portions 23 and 24, and side wall portions (not shown).
  • Room 20 is another example of a closed space.
  • the wall portions 23 and 24 include fittings such as a door between the floor portion 21 and the ceiling portion 22.
  • the partition member 25 is provided between the wall portions 23 and 24.
  • the partition member 25 divides the room 20 into a first room 26 and a second room 27.
  • a speaker 7 for reproducing low-pitched sound is attached to the partition member 25 with the sound emitting surface of the speaker 7 facing the first chamber 26.
  • the speaker 7 outputs sound toward the first chamber 26.
  • Room 20 is, for example, a karaoke room or a living room.
  • the speaker 7 acts to acoustically connect the first chamber 26 and the second chamber 27. Then, a standing wave having a waveform as shown by the alternate long and short dash line 28 is generated in one space formed by the first chamber 26 and the second chamber 27.
  • FIG. 20 shows changes in the sound pressure distribution before and after installing the sound absorbing structure that suppresses the primary standing wave in the second chamber 27 shown in FIG.
  • the sound absorbing structure when the sound absorbing structure is installed in one space formed by the first chamber 26 and the second chamber 27, the sound absorbing structure can suppress the standing wave and the sound in the bass range. Sound quality can be improved.
  • the sound absorbing structure may be installed in the first chamber 26.
  • the sound absorbing structure for example, the above-mentioned tube sound absorbing body or Helmholtz resonator is used.
  • the room 20 having this sound absorbing structure is, for example, a relatively narrow room of about 8 tatami mats or less in which a standing wave belonging to a low frequency range of 150 Hz or less becomes a problem, and suppresses the standing wave more preferably.
  • This sound absorbing structure may be adopted in a room of a larger size.
  • the first room 26 may be a living room and the second room 27 may be, for example, a walk-in closet.
  • a speaker that is attached to a partition member that divides a closed space into a first chamber and a second chamber and outputs sound toward the first chamber, and the first chamber or the first chamber. It is provided in two chambers, and includes a sound absorbing structure that absorbs sound caused by a standing wave generated in the closed space. Since the sound absorbing structure is provided in the first room or the second room, standing waves can be suppressed and the sound environment in a small space such as a vehicle interior can be improved.
  • the reproducible band of the speaker includes the frequency of the primary standing wave among the standing waves generated in the closed space.
  • the primary standing wave which has a particularly large effect on the reproduced sound, is suppressed. Therefore, the sound environment in a small space such as a vehicle interior can be satisfactorily improved.
  • the fundamental frequency of the standing wave is obtained by multiplying the resonance frequency by 1.1 from the frequency obtained by multiplying the resonance frequency of the sound absorbing structure by 0.9. It is in the range up to the frequency.
  • the fundamental frequency of the standing wave is within the range from the frequency obtained by multiplying the resonance frequency of the sound absorbing structure by 0.9 to the frequency obtained by multiplying the resonance frequency by 1.1. Standing waves are well suppressed.
  • the closed space has two ends, the partition member is provided between the two ends, and the wavelength of the standing wave having the fundamental frequency. Is twice as long as the distance between the two ends. In this case, since the standing wave having the resonance frequency is suppressed, the sound quality of the sound in the low frequency range is improved.
  • the first room is the passenger compartment of the vehicle
  • the second chamber is the trunk room of the vehicle.
  • the standing wave is suppressed in the vehicle. Therefore, the variation in the sound pressure distribution in the low frequency range such as audio in the vehicle interior is reduced, and the sound quality is improved.
  • the sound absorbing structure is located at the rear end of the vehicle in the trunk room. In this case, since the sound absorbing structure is attached to the trunk room, it is easier to secure the mounting space as compared with the configuration in which the sound absorbing structure is attached to the passenger compartment.
  • the sound absorbing structure is located on the bottom surface of the trunk room.
  • the sound absorbing structure can be easily attached as compared with the configuration in which the sound absorbing structure is located on the side surface of the trunk room.
  • At least a part of the sound absorbing structure is located in front of the driver's seat in the passenger compartment. In this case as well, since the standing wave is suppressed, the variation in the sound pressure distribution in the low frequency range such as audio in the vehicle interior is reduced, and the sound quality is improved.
  • the sound absorbing structure communicates with a tubular tube sound absorbing body having a closed end and an opened other end, or a hollow member having an opening, and the opening. It is provided with a communication unit and a Helmholtz resonator having. In this case, since the tube sound absorber or the Helmholtz resonator is provided as the sound absorbing structure, the standing wave is well suppressed.
  • the above-mentioned vehicle is equipped with the above-mentioned speaker system. Since the vehicle includes the speaker system having the sound absorbing structure described above, the standing wave in the internal space of the vehicle can be reduced, and the sound quality of the sound output from the speaker to the vehicle interior can be improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

L'invention concerne un système de haut-parleur comprenant : un haut-parleur (7) qui est fixé à un élément de division (6) qui divise un espace (9) en une première pièce (2) et une seconde pièce (3), et qui émet un son vers la première pièce (2) ; et une structure d'absorption de son (10A) qui est disposée dans la première pièce ou la seconde pièce et absorbe le son provoqué par des ondes stationnaires produites à l'intérieur de l'espace (9).
PCT/JP2020/026862 2019-07-12 2020-07-09 Système de haut-parleur et véhicule WO2021010280A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080050392.6A CN114097252A (zh) 2019-07-12 2020-07-09 扬声器***及车辆

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019129926A JP2021015207A (ja) 2019-07-12 2019-07-12 スピーカーシステム及び車両
JP2019-129926 2019-07-12

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WO2021010280A1 true WO2021010280A1 (fr) 2021-01-21

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CN (1) CN114097252A (fr)
WO (1) WO2021010280A1 (fr)

Citations (5)

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JP2010052632A (ja) * 2008-08-29 2010-03-11 Yamaha Corp 車体構造体およびインストルメントパネル
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