CN114097252A - Speaker system and vehicle - Google Patents

Speaker system and vehicle Download PDF

Info

Publication number
CN114097252A
CN114097252A CN202080050392.6A CN202080050392A CN114097252A CN 114097252 A CN114097252 A CN 114097252A CN 202080050392 A CN202080050392 A CN 202080050392A CN 114097252 A CN114097252 A CN 114097252A
Authority
CN
China
Prior art keywords
sound
sound absorbing
absorbing structure
vehicle
chamber
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202080050392.6A
Other languages
Chinese (zh)
Inventor
本地由和
内田胜也
三木晃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamaha Corp
Original Assignee
Yamaha Corp
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 Yamaha Corp filed Critical Yamaha Corp
Publication of CN114097252A publication Critical patent/CN114097252A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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

Landscapes

  • 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

A speaker system includes: a speaker (7) that is attached to a partition member (6) that partitions a space (9) into a1 st chamber (2) and a2 nd chamber (3), and that outputs sound toward the 1 st chamber (2); and a sound absorbing structure (10A) which is provided in the 1 st chamber (2) or the 2 nd chamber (3) and absorbs sound caused by standing waves generated in the space (9).

Description

Speaker system and vehicle
Technical Field
The present invention relates to a speaker system and a vehicle having the speaker system.
Background
In a vehicle having a trunk and a vehicle interior in which a person sits, a vehicle mounted with a sound absorbing structure disposed in the trunk is known as disclosed in patent document 1 for the purpose of reducing noise in the vehicle interior. The sound absorbing structure of patent document 1 reduces road noise generated from tires and standing waves in the trunk.
Patent document 1: japanese patent No. 5359167
Disclosure of Invention
One of the problems to be solved by the present invention is to provide a technique capable of improving the sound environment of a space in which 2 chambers are partitioned by a partition member in which a speaker is installed.
In order to solve the above problem, a speaker system according to an aspect of the present invention includes: a speaker attached to a partition member that partitions a closed space into a1 st chamber and a2 nd chamber, and configured to output sound toward the 1 st chamber; and a sound absorbing structure provided in the 1 st chamber or the 2 nd chamber, for absorbing sound caused by standing waves generated in the closed space.
Drawings
Fig. 1 is a side view showing a vehicle having a speaker system according to an embodiment of the present invention.
Fig. 2 is a plan view showing the arrangement of speakers of the speaker system.
Fig. 3 is a side view showing a waveform of a first-order standing wave of a vehicle having no sound absorbing structure.
Fig. 4 is a diagram showing a relationship between sound pressure at the rear end portion of the trunk of the vehicle and the frequency of the standing wave.
Fig. 5 is a diagram showing a relationship between sound pressure at the front seat of the vehicle and the frequency of the standing wave.
Fig. 6 is a plan view showing an arrangement example of a sound absorbing structure composed of a pipe sound absorber.
Fig. 7 is a perspective view showing an example of a sound absorbing structure including a pipe sound absorbing body.
Fig. 8 is a cross-sectional view taken along line E-E of fig. 7.
Fig. 9 is a diagram showing the sound pressure distribution of the first-order standing wave in the vehicle interior before and after the sound absorbing structure is installed.
Fig. 10 is a side view showing another example of the arrangement of the sound absorbing structure composed of the pipe sound absorber.
Fig. 11 is a side view showing still another example of the arrangement of the sound absorbing structure composed of the pipe sound absorber.
Fig. 12 is a perspective view showing a sound absorbing structure including helmholtz resonators.
Fig. 13 is a side view showing an example of mounting the sound absorbing structure shown in fig. 12.
Fig. 14 is a plan view showing an example of mounting the sound absorbing structure shown in fig. 12.
Fig. 15 is a side view showing another example of the arrangement of the sound absorbing structure including the helmholtz resonator.
Fig. 16 is a side view showing still another example of the arrangement of the sound absorbing structure including the helmholtz resonator.
Fig. 17 is a sectional view showing another example of the helmholtz resonator.
Fig. 18 is a sectional view showing still another example of the helmholtz resonator.
Fig. 19 is a side view showing an example of a room to which the speaker system of the present invention is applied, together with a waveform of a first-order standing wave.
Fig. 20 is a diagram showing the sound pressure distribution of the first-order standing wave in the room shown in fig. 19 before and after the sound absorbing structure is installed in the room.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the dimensions and scales of the respective portions are appropriately different from the actual dimensions and scales. The embodiments described below are preferable specific examples of the present invention. Therefore, in the present embodiment, various technically preferable limitations are attached. However, the scope of the present invention is not limited to these embodiments unless specifically described in the following description.
1. Detailed description of the preferred embodiments
Fig. 1 is a side view showing a vehicle having a speaker system according to an embodiment of the present invention. The vehicle 1 has a closed space 9. Hereinafter, the closed space 9 is simply referred to as "space 9". The space 9 includes a vehicle cabin 2 as an example of a1 st compartment and a trunk 3 as an example of a2 nd compartment. The vehicle compartment 2 is a space for accommodating a person. A front seat 5a and a rear seat 5b are provided in the vehicle compartment 2. The space 9 is partitioned into the vehicle compartment 2 and the trunk 3 by the rear seat 5b and the rear shelf 6 on the rear surface thereof. That is, the rear seat 5b and the rear parcel shelf 6 function as a partition member that partitions the space 9 into the vehicle compartment 2 and the trunk 3.
As shown in the plan views of fig. 1 and 2, the rear shelf 6 is attached to the speaker 7 in a state where the sound emitting surface of the speaker 7 faces the vehicle interior 2. The speaker 7 outputs sound toward the vehicle compartment 2. The speaker 7 is a speaker for playing a low-pitched sound, and is called a bass unit or a subwoofer unit. The rear placement board 6 may be provided with either or both of a speaker for playing middle range sounds and a speaker for playing high range sounds, in addition to the speaker 7 for playing low range sounds. A handrail 5c is provided between the left and right seats of the rear seat 5 b.
As shown in fig. 1, the space 9 is partitioned into the vehicle interior 2 and the trunk 3 by the rear seats 5b and the rear parcel shelf 6. Therefore, the trunk 3 functions as a chamber forming a rear space of the speaker 7. Generally, the cabin 2 and the trunk 3 are independent spaces. Therefore, standing waves are generated in the vehicle interior 2 and the trunk 3 due to the size of each space. However, when the rear panel 6 is provided with the speaker 7 for low-range sound having a larger diameter than the speakers for middle-range sound and high-range sound, the vehicle interior 2 and the trunk 3 are acoustically connected through the diaphragm of the speaker 7. As a result, the space 9 formed by the vehicle cabin 2 and the trunk 3 acoustically functions as 1 space. Therefore, a standing wave having a waveform indicated by a two-dot chain line 11 in fig. 3 is generated. The playback frequency band of the speaker 7 contains the frequency of the first-order standing wave among the frequencies of the standing waves. The playback frequency band refers to the effective frequency range specified by the electronic information technology industry association standard JEITA RC-8124C "speaker system".
The standing wave shown in fig. 3 is generated in a space 9 from the front end portion 2a of the vehicle interior 2 to the rear end portion 3a of the trunk 3. The front end portion 2a and the rear end portion 3a are an example of 2 end portions of the space 9. Of the standing waves generated in the space 9, the first-order standing wave having the lowest frequency has a wavelength (1 wavelength) 2 times as long as the length L in the front-rear direction of the space 9 (the distance between the front end portion 2a and the rear end portion 3 a) in the case of a normal vehicle. The frequency of this first-order standing wave is about 60Hz with a length L of 2.83m of the space 9. The frequency of the first-order standing wave is the fundamental frequency of the standing wave.
In the vehicle interior, not only the first-order standing wave but also a standing wave of an order of one or more orders, that is, a frequency of an integral multiple of the first-order frequency (60Hz which is a fundamental frequency) is generated. Fig. 4 is a graph showing the relationship between the sound pressure at the rear end portion 3a of the trunk 3 and the frequencies of the first, second, and third standing waves. The sound pressure at the rear end portion 3a of the trunk 3 is highest not only when the first-order standing wave (60Hz) is generated, but also when the second-order standing wave (120Hz) is generated and when the third-order standing wave (180Hz) is generated. The sound pressure at the front end portion 2a of the vehicle interior 2 is also the highest when standing waves are generated, as is the sound pressure at the rear end portion 3a of the trunk 3.
Fig. 5 is a graph showing the relationship between the sound pressure and the frequency of the standing wave at the point 5a1 (see fig. 1 and 3) of the front seat 5 a. At the point 5a1, the sound pressure changes in accordance with the frequency of the standing wave (60Hz, 120Hz, 180 Hz). The sound pressure change caused by such standing waves deteriorates the quality of the sound output from the speaker 7 to the vehicle interior 2. That is, due to the generation of the standing wave, the sound pressure of the sound output from the speaker 7 extremely becomes high or low at a specific position in the vehicle interior 2. For example, at the point 5a1 in the vehicle interior 2, the sound pressure unexpectedly changes, resulting in a decrease in sound quality. In particular, the first order standing wave greatly affects the variation of the sound pressure.
In order to suppress standing waves, in the present embodiment, as shown in fig. 1, a sound absorbing structure 10A is attached to the trunk 3. As shown in the plan view of fig. 6 and the oblique view of fig. 7, the sound absorbing structure 10A is an aggregate of tubular sound absorbing pipes 10A to 10 i. The number of the pipe sound absorbers 10a to 10i is not limited to "8". The sound absorbing structure 10A may have 1 or more sound absorbing pipes. As shown in the cross-sectional view of fig. 8, the sound absorbing pipe bodies 10a to 10i are closed pipes each having a closed end 10x and an open end 10 y. The plugged end portion 10x is an example of a plugged end of a tubular sound-absorbing pipe. The open end portion 10y is an example of the other end of the opening of the pipe-shaped sound absorbing body. As shown in fig. 6, sound absorbing structure 10A is attached in a state where opening end 10y of sound absorbing pipe 10A to 10i is directed toward rear end 3a of trunk 3. The sound pressure of the standing wave is highest at the rear end portion 3a of the trunk 3. 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. As in this example, when the sound absorbing pipe bodies 10a to 10i are each formed of a closed pipe, the sound absorbing pipe bodies 10a to 10i resonate at the frequency of the standing wave of the odd-order. Therefore, the sound absorbing structure 10 can effectively suppress the standing waves of the odd-numbered order.
In the sound absorbing structure 10A including the sound absorbing pipe structures 10A to 10i, the length a of the hollow portion shown in fig. 8 is set to the length expressed by the expression (1) so that the first order standing wave of the space 9, specifically, the standing wave having the frequency f1(60Hz) and the wavelength λ (≈ 2L) resonates with the sound absorbing structure 10A.
[ formula 1]
Figure BDA0003462203390000051
The resonance frequency f0 of the sound absorbing structure 10A including the sound absorbing pipe bodies 10A to 10i is substantially equal to the frequency f1 of the first-order standing wave. Therefore, when the opening end 10y of the sound absorbing structure 10A is located near the rear end 3a of the trunk 3, sound generated by the standing waves is absorbed by the sound absorbing structure 10A. Therefore, as shown in fig. 9, when the sound absorbing structure 10A is provided, the sound pressure decreases at both end portions of the space 9 and increases at the center portion of the space 9. Specifically, the sound pressure at the center of the space 9 rises by about 2 dB. That is, since the standing wave is suppressed, the variation of the sound pressure due to the standing wave is small in the front and rear areas of the space 9 in the vehicle. As a result, the sound environment is improved, and the sound quality of the sound in the vehicle interior 2, for example, the sound output from the speaker 7 to the vehicle interior 2 is improved.
Since the sound absorbing structure 10A is provided in the trunk 3, standing waves are suppressed. Therefore, in the vehicle interior 2 in which a person is seated, low-range sound such as audio output from the speaker 7 to the vehicle interior 2 is less likely to be affected by standing waves. Therefore, the sound environment is improved, and the sound quality of the sound in the vehicle interior 2, for example, the sound output from the speaker 7 to the vehicle interior 2 is improved.
The fundamental frequency of the standing wave, i.e., the frequency f1 of the first-order standing wave is preferably close to the resonance frequency f0 of the sound-absorbing structure 10A. Specifically, if the frequency f1 of the first-order standing wave is in the range 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, a relatively good effect of suppressing the standing wave can be obtained.
As shown in fig. 1 and 6, sound absorbing structure 10A is attached to the bottom surface of trunk 3. Therefore, the sound absorbing structure 10A having a flat shape as shown in the example of the figure can be fixed to the trunk 3. As a result, the user can easily attach the sound absorbing structure 10A.
Fig. 10 shows an example of mounting sound absorbing structure 10B of the vehicle according to the present embodiment. In this mounting example, sound absorbing structure 10B is disposed in a portion of trunk 3 corresponding to the rear end of vehicle 1. The pipe sound absorbing body constituting the sound absorbing structure 10B extends in the vertical direction. Sound absorbing structure 10B is attached so that open end 10y of the pipe sound absorber faces the bottom surface of trunk 3 at rear end 3a of trunk 3.
When sound absorbing structure 10B is attached to trunk 3 at a position corresponding to the rear end of vehicle 1, sound absorbing structure 10B does not require high rigidity compared to a structure in which sound absorbing structure 10B is provided on the bottom surface of trunk 3.
Fig. 11 also shows an example of mounting the sound absorbing structure 10C in the vehicle according to the present embodiment. In this example, the sound absorbing structure 10C is attached to the vehicle interior 2 so that at least a part of the sound absorbing structure 10C constituting the pipe sound absorbing body is positioned forward of the front seat 5a as the driver's seat. The opening end 10y of the sound absorbing structure 10C is located at the front end 2a of the vehicle interior 2. More specifically, the sound absorbing structure 10C is provided in the vehicle interior 2 from a portion facing the bottom surface of the front passenger seat to the front surface of the vehicle interior 2. The sound absorbing structure 10C may be attached to an instrument panel provided at the front end 2a of the vehicle compartment 2. The sound absorbing structures 10A to 10C each including a pipe sound absorber may be bent to secure a required pipe length.
In the above example, the sound absorbing structures 10A, 10B, and 10C are mounted separately. However, 2 or more sound absorbing structures out of the sound absorbing structures 10A, 10B, and 10C may be attached to the vehicle 1.
Even when the sound absorbing structure 10C is installed in the vehicle interior 2, standing waves can be suppressed, and the sound quality of low-pitched sound can be improved.
In the present invention, as the sound absorbing structure, not only the pipe sound absorber but also the helmholtz resonator 14A shown in fig. 12 may be used. The helmholtz resonator 14A is a flat plate-like sound absorbing structure having a rectangular parallelepiped shape and formed by a combination of plate materials.
The helmholtz resonator 14A has more than 1 (3 in the illustrated example) resonance cells 14A and more than 1 (3 in the illustrated example) neck 14 b. The resonance cell 14a is an internal space of the hollow member 14a 1. The hollow member 14a1 has an opening 14a 2. The resonance cell 14a has a rectangular parallelepiped shape. The neck 14b is an open tube. The neck portions 14b correspond to the resonant air cells 14a one-to-one. The neck portion 14b communicates with the opening portion 14a2 of the corresponding resonance cell 14 a. Therefore, the external air can flow into the resonance cell 14a through the neck portion 14 b. The neck portion 14b is an example of a communicating portion. For convenience of explanation, the resonance cell 14a side is referred to as the rear side, and the neck 14b side is referred to as the front side.
The resonance 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 15 f. The upper plate 15b is separated from the bottom plate 15 a. A space exists between the bottom plate 15a and the upper plate 15 b. The rear plate 15c is joined to the bottom plate 15a and the upper plate 15b on the rear side of the helmholtz resonator 14 a. The side plate 15d is joined to the bottom plate 15a and the upper plate 15b on the left side of the helmholtz resonator 14 a. The side plate 15e is joined to the bottom plate 15a and the upper plate 15b on the right side of the helmholtz resonator 14 a. 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 upper plate 15b at a position between the front and rear of the helmholtz resonator 14 a. The 2 partition plates 15f are separated from each other, and the opening 14a2 is formed by the 2 partition plates 15 f.
The neck portion 14b is formed by a bottom plate 15a, an upper plate 15b, and partition plates 15g and 15 h. The partition plates 15g and 15h extend from the front side of the helmholtz resonator 14a to the partition plate 15f, and are joined to the bottom plate 15a and the upper plate 15 b.
The resonance frequency f0 of the sound absorbing structure constituted by the helmholtz resonator 14A can be expressed by expression (2). In equation (2), c is the sound velocity, s is the opening area of the neck 14b, V is the volume of the resonance cell 14a, l is the length of the neck 14b, and δ is the correction value of the opening end of the neck 14 b.
[ formula 2]
Figure BDA0003462203390000071
As shown in fig. 13 and 14, the sound absorbing structure composed of the helmholtz resonator 14A is attached to the bottom surface of the trunk 3 in a state where a ventilation gap is formed between the neck portion 14b and the rear end portion 3a of the trunk 3. The helmholtz resonator 14A can be configured more compactly than the sound absorbing structures 10A to 10C configured by the pipe sound absorbing body. Therefore, the sound absorbing structure can be easily arranged.
As shown in fig. 15, the helmholtz resonator 14B may be attached to the rear end portion 3a in the trunk 3. The helmholtz resonator 14B may be provided along the rear end portion 3a of the trunk 3 from the bottom surface of the trunk 3. In this case, at least the neck portion 14b is located at the rear end portion 3a of the trunk 3. As shown in fig. 16, the helmholtz resonator 14C may be attached to the front seat 5a, i.e., in front of the driver's seat. In this case, the neck portion of the helmholtz resonator 14C may be horizontal, or the open end of the neck portion may be located at the front end portion 2a of the vehicle interior 2.
In the above example, the helmholtz resonators 14A, 14B, and 14C are mounted individually, but 2 or more of them may be mounted on the vehicle 1.
Fig. 17 shows another example of a helmholtz resonator. The helmholtz resonator 14D has a neck portion 14b and a resonance cell 14a formed in a rectangular parallelepiped box shape. The external air can flow into the resonance cell 14a through the neck portion 14 b. The neck portion 14b has a through hole 14e provided in a front plate 14d, and the front plate 14d has a thickness.
Fig. 18 further shows another example of the helmholtz resonator. The helmholtz resonator 14E includes a neck portion 14b and a resonance cell 14a formed in a rectangular parallelepiped box shape. The neck portion 14b is formed of a cylindrical portion 14g provided on the front plate 14 d.
The helmholtz resonator 14E further has 1 or more resonance cells 14ax and 1 or more necks 14bx on the side surface of the helmholtz resonator 14E. The helmholtz resonator 14E shown in fig. 18 has a plurality of resonance cells 14ax and a plurality of necks 14 bx.
The hollow member 14ax1 having the resonance cell 14ax as an internal space has an opening 14ax2 on the side of the helmholtz resonator 14E, i.e., in a direction perpendicular to the direction in which the neck 14b extends. The neck portion 14bx communicates with the opening portion 14ax 2.
The resonance cell 14ax is provided for the purpose of suppressing standing waves having a frequency different from that of the standing waves generated in the space 9 of the vehicle 1. For example, the resonance cell 14ax is provided in the trunk 3 or the vehicle interior 2 in order to suppress standing waves generated only in the trunk 3 or the vehicle interior 2, road noise generated in tires, and the like.
As shown in fig. 18, the helmholtz resonator 14E suppresses not only standing waves in the space 9 formed by the vehicle interior 2 and the trunk 3 but also other standing waves, noise, and the like, and therefore can also improve the acoustic environment of the vehicle interior 2.
2. Modification example
Fig. 19 is a side view showing an example of a room to which the speaker system of the present invention is applied together with a waveform of a first-order standing wave.
The room 20 is formed of a floor portion 21, a ceiling portion 22, front and rear wall portions 23 and 24, and side wall portions not shown in the drawings, to form a small space. The room 20 is another example of an enclosed space. For convenience, the wall portions 23 and 24 are doors and windows such as doors included between the floor portion 21 and the ceiling portion 22. The partition member 25 is disposed between the wall portions 23 and 24. The partition member 25 partitions the room 20 into a1 st chamber 26 and a2 nd chamber 27. The partition member 25 is attached with the speaker 7 for playing the low-range sound in a state where the sound emitting surface of the speaker 7 faces the 1 st chamber 26. The speaker 7 outputs sound toward the 1 st chamber 26.
The room 20 is, for example, a karaoke room or a living room. In this case, as in the case of the vehicle 1, the speaker 7 functions to acoustically connect the 1 st chamber 26 and the 2 nd chamber 27. Further, in 1 space formed by the 1 st chamber 26 and the 2 nd chamber 27, a standing wave having a waveform as shown by a double-dashed line 28 is generated.
Fig. 20 shows changes in sound pressure distribution before and after the sound-absorbing structure for suppressing the first-order standing wave is installed in the 2 nd chamber 27 shown in fig. 19. As shown in fig. 20, when the sound absorbing structure is provided in 1 space formed by the 1 st chamber 26 and the 2 nd chamber 27, the sound absorbing structure can suppress standing waves and improve the sound quality of sound in a low-pitched sound range. The sound absorbing structure may be provided in the 1 st chamber 26. Examples of the sound absorbing structure include the above-described tube sound absorber and helmholtz resonator. The room 20 having the sound absorbing structure is a narrow room of about 8 tatami (equivalent to about 13 square meters) or less, which is a problem of standing waves in a low-pitched range of 150Hz or less, for example, and is more suitable for suppressing standing waves. The sound absorbing structure may be a large room having an area larger than the above. The 1 st room 26 is a living room, and the 2 nd room 27 may be a locker room, for example.
The foregoing embodiments are representative of the present invention. The present invention is not limited to the above-described embodiments, and various modifications and additions can be made without departing from the scope of the present invention.
3. Modes grasped from at least 1 of embodiment and modifications
The following modes are grasped from at least 1 of the above-described embodiments and modifications.
One embodiment of the speaker system described above includes: a speaker attached to a partition member that partitions a closed space into a1 st chamber and a2 nd chamber, and configured to output sound toward the 1 st chamber; and a sound absorbing structure provided in the 1 st chamber or the 2 nd chamber, for absorbing sound caused by standing waves generated in the closed space. Since the sound absorbing structure is provided in the 1 st chamber or the 2 nd chamber, standing waves can be suppressed, and the sound environment in a small space such as a vehicle interior can be improved.
The playable frequency band of the speaker of one aspect of the speaker system described above includes the frequency of the first order standing wave in the standing wave generated in the enclosed space. In this case, in particular, a first-order standing wave that greatly affects the playback sound is suppressed. Therefore, the sound environment in a small space such as a vehicle cabin can be improved.
In one embodiment of the above speaker system, a fundamental frequency of the standing wave is in a range from a frequency obtained by multiplying a resonance frequency of the sound-absorbing structure by 0.9 to a frequency obtained by multiplying the resonance frequency by 1.1. In this case, since the fundamental frequency of the standing wave is in 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, the standing wave can be suppressed satisfactorily.
In one mode of the above speaker system, the closed space has 2 ends, the partition member is provided between the 2 ends, and the wavelength of the standing wave having the fundamental frequency is a length 2 times a distance between the 2 ends. In this case, since the standing wave having the resonance frequency is suppressed, the sound quality of the low-pitched sound is improved.
In one embodiment of the speaker system described above, the 1 st room is a vehicle room of a vehicle, and the 2 nd room is a trunk of the vehicle. In this case, standing waves are suppressed in the vehicle. Therefore, the fluctuation of the sound pressure distribution in a low-pitched sound range such as a vehicle interior audio frequency becomes small, and the sound quality is improved.
In one aspect of the speaker system described above, the sound absorbing structure is located at a rear end of the vehicle in the trunk. In this case, since the sound absorbing structure is attached to the trunk, the installation space is easily secured as compared with a structure in which the sound absorbing structure is attached to the vehicle interior.
In one aspect of the speaker system, the sound absorbing structure is located on a bottom surface of the trunk. In this case, since the sound absorbing structure is located on the bottom surface of the trunk, the sound absorbing structure can be easily attached as compared with a structure in which the sound absorbing structure is located on the side surface of the trunk.
In one aspect of the speaker system, at least a part of the sound absorbing structure is located forward of a driver's seat in the vehicle cabin. In this case, since the standing wave is also suppressed, the fluctuation of the sound pressure distribution in a low-pitched sound range such as a vehicle interior audio frequency is reduced, and the sound quality is improved.
In one aspect of the speaker system, the sound absorbing structure includes: a tubular sound absorbing pipe having one closed end and the other open end, or a helmholtz resonator having a hollow member with an opening and a communication portion communicating with the opening. In this case, since the pipe sound absorber or the helmholtz resonator is provided as the sound absorbing structure, standing waves can be favorably suppressed.
In order to solve the above problem, the vehicle includes the speaker system described above. Since the vehicle has the speaker system having the sound absorbing structure, standing waves in the interior space of the vehicle are reduced, and the sound quality of sound output from the speaker to the vehicle interior can be improved.
Description of the reference numerals
A vehicle 1 …, a vehicle 2 …, a trunk 3 …, a trunk 5a …, a front seat 5b …, a rear seat 6 …, a speaker 7 …, a space 9 …, sound absorbing structures (tube absorbers) 10A to 10C …, waveforms of 11 and 12 … first order standing waves, sound absorbing structures (helmholtz resonators) 14A to 14E …, a room 20 …, a floor 21 …, a ceiling 22 …, walls 23 and 24 …, a partition 25 …, a standing wave 26 …, a room 27 …, a room 2, a standing wave 28 and 29 …, and a sound absorbing structure 30 ….

Claims (10)

1. A speaker system having:
a speaker attached to a partition member that partitions a closed space into a1 st chamber and a2 nd chamber, and configured to output sound toward the 1 st chamber; and
and a sound absorbing structure provided in the 1 st chamber or the 2 nd chamber and configured to absorb sound caused by a standing wave generated in the closed space.
2. The speaker system of claim 1,
the playback frequency band of the speaker contains the frequency of a first-order standing wave among the standing waves generated in the closed space.
3. The speaker system of claim 1 or 2,
the fundamental frequency of the standing wave is in a range from a frequency obtained by multiplying the resonance frequency of the sound-absorbing structure by 0.9 to a frequency obtained by multiplying the resonance frequency by 1.1.
4. The speaker system of any of claims 1-3,
the closed space has 2 ends,
the partition member is disposed between the 2 ends,
the wavelength of the standing wave having the fundamental frequency is a length 2 times the distance between the 2 ends.
5. The speaker system of any of claims 1-4,
the 1 st chamber is a vehicle compartment of a vehicle, and the 2 nd chamber is a trunk of the vehicle.
6. The speaker system of claim 5 wherein,
the sound absorbing structure is located at a rear end of the vehicle in the trunk.
7. The speaker system of claim 5 wherein,
the sound absorbing structure is located on a bottom surface of the trunk.
8. The speaker system of claim 5 wherein,
at least a part of the sound absorbing structure is located forward of the driver's seat in the vehicle interior.
9. The speaker system of any of claims 1-4,
the sound absorbing structure includes:
a tubular sound absorbing pipe body having one end closed and the other end opened; or
The Helmholtz resonator includes a hollow member having an opening portion, and a communication portion communicating with the opening portion.
10. A vehicle having the speaker system of any one of claims 5-8.
CN202080050392.6A 2019-07-12 2020-07-09 Speaker system and vehicle Pending CN114097252A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2019-129926 2019-07-12
JP2019129926A JP2021015207A (en) 2019-07-12 2019-07-12 Speaker system and vehicle
PCT/JP2020/026862 WO2021010280A1 (en) 2019-07-12 2020-07-09 Speaker system and vehicle

Publications (1)

Publication Number Publication Date
CN114097252A true CN114097252A (en) 2022-02-25

Family

ID=74210787

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202080050392.6A Pending CN114097252A (en) 2019-07-12 2020-07-09 Speaker system and vehicle

Country Status (3)

Country Link
JP (1) JP2021015207A (en)
CN (1) CN114097252A (en)
WO (1) WO2021010280A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0624277A (en) * 1992-04-21 1994-02-01 Bose Corp Audio speaker system for on vehicle
JPH08331682A (en) * 1995-05-29 1996-12-13 Onkyo Corp On-vehicle stereo reproducing device
JPH1097263A (en) * 1996-09-24 1998-04-14 Alpine Electron Inc Sound field control method
JP2010052632A (en) * 2008-08-29 2010-03-11 Yamaha Corp Vehicle body structure and instrument panel
JP2010089616A (en) * 2008-10-07 2010-04-22 Yamaha Corp Vehicle body structure body and luggage compartment
DE102015013879A1 (en) * 2015-10-28 2016-04-14 Daimler Ag Arrangement of a speaker device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5315864B2 (en) * 2008-09-01 2013-10-16 ヤマハ株式会社 Car body structure and floor
JP5500808B2 (en) * 2008-09-17 2014-05-21 株式会社タイトー Game device
US9099075B2 (en) * 2010-10-20 2015-08-04 Yamaha Corporation Standing wave attenuation device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0624277A (en) * 1992-04-21 1994-02-01 Bose Corp Audio speaker system for on vehicle
JPH08331682A (en) * 1995-05-29 1996-12-13 Onkyo Corp On-vehicle stereo reproducing device
JPH1097263A (en) * 1996-09-24 1998-04-14 Alpine Electron Inc Sound field control method
JP2010052632A (en) * 2008-08-29 2010-03-11 Yamaha Corp Vehicle body structure and instrument panel
JP2010089616A (en) * 2008-10-07 2010-04-22 Yamaha Corp Vehicle body structure body and luggage compartment
DE102015013879A1 (en) * 2015-10-28 2016-04-14 Daimler Ag Arrangement of a speaker device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SAITO, MIWAKO: "Graps of vehicle interior acoustic characteristics by multi-point excitation using speakers", MASTER\'S THESIS OF TOKYO METROPOLITAN UNIVERSITY GRADUATE SCHOOL, pages 39 *

Also Published As

Publication number Publication date
WO2021010280A1 (en) 2021-01-21
JP2021015207A (en) 2021-02-12

Similar Documents

Publication Publication Date Title
JP5028479B2 (en) Bandpass box in the vehicle support structure
US8011472B2 (en) Sound absorbing structure and vehicle component having sound absorbing property
JP5326472B2 (en) Sound absorption structure
US20090223738A1 (en) Sound absorbing structure and vehicle component having sound absorption property
JP2011057000A (en) Acoustic resonance device
JP2021189212A (en) Sound isolation system and sound isolation method
KR101778549B1 (en) Speaker device for vehicle, and vehicle having the same
JPH0850489A (en) Sound absorbing structure
KR101260823B1 (en) Diffraction noise reduction device for noise barrier upper edge using helmholtz resonance absorber
JP6462885B2 (en) Speaker system for moving objects
US10486614B2 (en) Speaker system for mobile object
JP5315861B2 (en) Car body structure and instrument panel
WO2020165647A1 (en) Sound reflection structure
CN114097252A (en) Speaker system and vehicle
CN109660912B (en) Vehicle-mounted sound box and automobile
US10764662B2 (en) Speaker system and enclosure structure of speaker system
EP3926622A1 (en) Sound reflection structure
JP2021122132A (en) Sound generation device for mobile body
JPH10236333A (en) Dash panel of automobile
CN215770498U (en) Vehicle resonance system and vehicle
JP2000272439A (en) Sound insulating front grille panel, sound absorbing bumper and outside-car noise reducing device
WO2024048130A1 (en) Sound-absorbing device and vehicle
WO2017037806A1 (en) Speaker system for moving body
JPH10301577A (en) Sound absorber
CN113212139A (en) Battery pack structure and forming method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination