EP3249947B1 - Bass reflex port and acoustic device - Google Patents

Bass reflex port and acoustic device Download PDF

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Publication number
EP3249947B1
EP3249947B1 EP17172712.6A EP17172712A EP3249947B1 EP 3249947 B1 EP3249947 B1 EP 3249947B1 EP 17172712 A EP17172712 A EP 17172712A EP 3249947 B1 EP3249947 B1 EP 3249947B1
Authority
EP
European Patent Office
Prior art keywords
bass reflex
reflex port
tube
wall surface
sheet member
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.)
Active
Application number
EP17172712.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3249947A1 (en
Inventor
Koji Okazaki
Hideto Matsuda
Akira Miki
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 EP3249947A1 publication Critical patent/EP3249947A1/en
Application granted granted Critical
Publication of EP3249947B1 publication Critical patent/EP3249947B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • 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
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for 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
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

Definitions

  • This invention relates to a bass reflex port and an acoustic device such as a bass reflex speaker.
  • a bass reflex speaker that enhances the volume of a low-pitched sound by using the sound emitted from a speaker unit to the back side of a housing of the bass reflex speaker has conventionally been proposed.
  • a bass reflex port that communicates the inside and the outside of the housing (enclosure) with each other is provided.
  • an unusual sound (noise) is caused from the bass reflex port. Therefore, various technologies to reduce the unusual sound caused from the bass reflex port have been proposed.
  • JP-UM-A-56-63182 discloses a speaker system in which a sound absorbing material such as glass wool is attached to at least one opening of a bass reflex port. According to this technology, the generation of air whirl at the opening of the bass reflex port is suppressed by the sound absorbing material, thereby reducing the unusual sound.
  • JP-UM-A-58-173989 discloses a bass reflex cabinet for a speaker in which a buffer material such as urethane is provided at a free end opposite to a fixed end fixed to a housing in a bass reflex port. The free end is fixed to nowhere. According to this technology, vibration at the free end of the bass reflex port becomes difficult to occur, thereby reducing the unusual sound.
  • JP-UM-A-56-63182 or JP-UM-A-58-173989 is used, the unusual sound caused from the bass reflex port because of air flowing in the bass reflex port cannot be sufficiently reduced.
  • Another example can be seen in document EP 0 361 445 A2 .
  • Document EP 0 334 217 A2 discloses a bass reflex port comprising: a tubular member, wherein a rigidity of a part of a wall surface of the tubular member is smaller than that of a remaining part of the tubular member; wherein a rigidity of a wall surface of at least one end portion of the tubular member in an axis direction of the tubular member is smaller than that of a wall surface of a central portion of the tubular member in the axis direction; the central portion being a region predetermined in the tube axis direction in the centre of the bass reflex port in the tube axis direction.
  • This invention is made in view of the above-described circumstances, and an object thereof is to reduce the unusual sound caused because of air flowing in the bass reflex port.
  • this invention provides an acoustic device provided with the bass reflex port.
  • the flow velocity distribution of the air in the vicinity of the inner wall surface of the bass reflex port is disordered, so that the position and the timing where a whirl occurs change randomly. Since the position and the timing where a whirl occurs do not concentrate but are dispersed, in the present bass reflex port, the growth of the whirl can be suppressed, so that the unusual sound caused due to the whirl can be reduced. That is, according to the acoustic device provided with the present bass reflex port, the unusual sound caused because of air flowing in the bass reflex port can be reduced.
  • a sound absorbing material is attached to the bass reflex port
  • a buffer material is attached to the bass reflex port.
  • the bass reflex port is not deformed, so that the position and the timing where a whirl occurs cannot be dispersed.
  • the position and the timing where a whirl occurs can be dispersed as described above, so that the growth of the whirl can be suppressed.
  • the unusual sound caused from the bass reflex port because of air flowing in the bass reflex port can be sufficiently reduced.
  • a whirl occurs at a position, closer to the center, on the end portion of the bass reflex port, and at another time different therefrom, a whirl occurs at a position, closer to the open end, on the end portion of the bass reflex port.
  • the frequency of the sound attributed to the whirl at the position, closer to the center, on the end portion of the bass reflex port and the frequency of the sound attributed to the whirl at the position, closer to the open end, on the end portion of the bass reflex port are different.
  • the unusual sound attributed to the concentration of occurrence of the whirl at a specific position and timing never becomes conspicuous, so that the unusual sounds of a plurality of frequencies in a predetermined frequency range like a continuous spectrum can be reduced. From this point, according to the present bass reflex port, the unusual sound caused from the bass reflex port because of air flowing in the bass reflex port can also be sufficiently reduced compared with the bass reflex ports disclosed in JP-UM-A-56-63182 and JP-UM-A-58-173989.
  • FIG. 1 is a cross-sectional view showing the structure of an acoustic device 1 including a bass reflex port 30 according to a first embodiment of this invention.
  • the acoustic device 1 emits a sound responsive to an acoustic signal supplied from an external device, specifically, the acoustic device 1 is a bass reflex speaker.
  • the acoustic device 1 has an enclosure 10 which is a housing of the acoustic device 1, the bass reflex port 30 and a speaker unit 20 formed of a diaphragm, a voice coil and the like.
  • the enclosure 10 is a hollow structure (typically, a rectangular parallelepiped) formed of a plurality of plate members.
  • the speaker unit 20 is fixed to a plate member 12 of the plate members constituting the enclosure 10.
  • This plate member 12 functions as a baffle surface.
  • the plate member 12 has a circular opening 14 passing through the plate member 12.
  • the enclosure 10 in the present embodiment is formed of a plurality of plate members, the enclosure 10 may be a resin molded product by injection molding or the like.
  • the opening 14 is provided on the plate member functioning as a baffle surface (that is, the plate member 12) in the acoustic device 1 in the present embodiment, the opening 14 may be provided on a surface other than the baffle surface such as the back surface or a side surface of the enclosure 10.
  • the shape of the opening 14 is not limited to a circle and may be a different shape.
  • the bass reflex port 30 is a hollow and substantially cylindrical tube, and is disposed in the enclosure 10. Both ends of the bass reflex port 30 are open. One open end of the bass reflex port 30 is fixed to the rim of the opening 14 of the plate member 12. The other open end of the bass reflex port 30 is located in the enclosure 10. The space in the enclosure 10 and the space outside the enclosure 10 are communicated through the bass reflex port 30 and the opening 14. For this reason, the air inside and outside the enclosure 10 passes in the bass reflex port 30.
  • the line as the center of the tube in the bass reflex port 30 will be referred to as tube axis.
  • the one fixed to the rim of the opening 14 will be referred to as external side, and the one that is open in the enclosure 10 will be referred to as internal side.
  • a region predetermined in the tube axis direction from the open end will be referred to as end portion.
  • a region predetermined in the tube axis direction in the center of the bass reflex port 30 in the tube axis direction will be referred to as central portion.
  • FIG. 2 is a cross-sectional view showing the structure of the bass reflex port 30.
  • the bass reflex port 30 includes a first tube 32, a second tube 34 and a sheet member 36.
  • the first tube 32 is a tubular member of a cylindrical shape (hereinafter, referred to as tubular shape) in which the inside diameter and the outside diameter are maintained substantially constant from one end to the other end thereof.
  • the first tube 32 is, for example, a paper tube shaped from a paper material such as recycled paper.
  • the constituent material of the first tube 32 is not limited to paper and may be resin or the like.
  • the second tube 34 is a tubular member of a straight tube shape having an inside diameter substantially equal to the outside diameter of the first tube 32.
  • the material forming the second tube 34 is, for example, a synthetic resin.
  • the length of the second tube 34 is shorter than that of the first tube 32.
  • a flange 35 is provided on one end of the second tube 34.
  • the first tube 32 has its one end side accommodated in the second tube 34, and is fixed to the second tube 34 with an appropriate frictional force between the outer wall surface of the first tube 32 and the inner wall surface of the second tube 34. Under a condition where the first tube 32 is fixed to the second tube 34, the other end side of the first tube 32 protrudes to the outside of the second tube 34 from the end opposite to the end of the second tube 34 where the flange 35 is provided.
  • the flange 35 of the second tube 34 is fixed to the rim of the opening 14 of the plate member 12 (baffle surface).
  • the first tube 32 is provided with the sheet member 36 protruding in the extending direction of the first tube 32 from an end 33 of the first tube 32 opposite to the baffle surface.
  • the material forming the sheet member 36 is, for example, felt, and the rigidity of the sheet member 36 is smaller than that of the first tube 32.
  • the sheet member 36 extends over in a circumferential direction (radial direction) of the first tube 32, and forms a tube disposed in a position where the first tube 32 is extended.
  • the sheet member 36 is provided so as to cover over the end 33 of the first tube 32. More specifically, the sheet member 36 is partly fixed to the inner wall surface of the first tube 32. In the example of FIG. 2 , the sheet member 36 is fixed over the entire inner wall surface of the first tube 32. The sheet member 36 extends so as to protrude from the end 33 of the first tube 32 in the extending direction of the first tube 32, is folded back in such a manner that a space 38 is formed by the end 33 of the first tube 32 and the sheet member 36, and has the end of extension thereof fixed to the outer wall surface of the first tube 32.
  • An example of the method of fixing the sheet member 36 to the first tube 32 is a method using double-faced tape.
  • a binding band or the like may be wound as a complement in order that the portion of the sheet member 36 pasted to the outer wall surface of the first tube 32 does not peel off.
  • the sheet member 36 is fixed in such a manner as to protrude in the extending direction from the end 33 of the first tube 32.
  • the folded-back portion of the sheet member 36 is the internal side end of the bass reflex port 30.
  • the portion, accommodated in the second tube 34, of the first tube 32 (more precisely, including the sheet member 36 fixed to the inner wall surface of the first tube 32) and the second tube 34 constitute the wall surface of the external side end portion of the bass reflex port 30.
  • the portion, protruding from the second tube 34, of the first tube 32 constitutes the wall surface of the central portion of the bass reflex port 30.
  • the portion, protruding from the first tube 32, of the sheet member 36 constitutes the wall surface of the internal side end portion of the bass reflex port 30.
  • the rigidity of the sheet member 36 (felt) is smaller than that of the first tube 32 (paper tube) in the bass reflex port 30
  • the rigidity of the wall surface of the internal side end portion of the bass reflex port 30 is smaller than that of the wall surface of the central portion thereof. For this reason, in the bass reflex port 30, the wall surface of the internal side end portion is readily deformed.
  • the sheet member 36 is folded back at the internal side end. For this reason, at the folded-back portion, the bass reflex port 30 has, although slightly, a flare shape where the area of the region surrounded by the sheet member 36 increases toward the internal side end.
  • FIG. 3 is a side view showing the structure of the bass reflex port 30.
  • a cutout 39 in the extending direction of the first tube 32 is provided more than one in number in the circumferential direction. For this reason, at the time of manufacture of the bass reflex port 30, the sheet member 36 fixed to the inner wall surface is neatly folded back toward the outer wall surface of the first tube 32, and easily fixed to the outer wall surface of the first tube 32.
  • a cutout like the cutout 39 of the portion serving as the outer wall surface is not provided on the portion serving as the inner wall surface of the sheet member 36 (in other words, the inner layer portion of the sheet member 36 folded back into two layers).
  • the above is the structure of the acoustic device 1 having the bass reflex port 30.
  • the rigidity of the wall surface of the internal side end portion is smaller than that of the wall surface of the central portion.
  • the internal side end portion with low rigidity moves randomly in the radial direction, the circumferential direction and the tube axis direction of the bass reflex port 30 and in a synthetic direction of these directions according to the air pressure difference.
  • the bass reflex port 30 (particularly, the sheet member 36) is deformed.
  • the shape of the inner wall surface on the internal side randomly changes at each position and each moment.
  • the flow velocity distribution of the air in the vicinity of the inner wall surface of the bass reflex port 30 is disordered, so that the position and the timing where a whirl occurs change randomly. That is, in the bass reflex port 30, the position and the timing where a whirl occurs according to the air pressure difference do not concentrate but are dynamically dispersed. For this reason, in the bass reflex port 30, the growth of the whirl can be suppressed compared with the conventional bass reflex port.
  • the bass reflex port 30 since the growth of the whirl can be suppressed by dynamically dispersing the position and the timing where the whirl occurs, an unusual sound caused due to the whirl can be sufficiently reduced compared with the conventional bass reflex port. That is, according to the acoustic device 1 provided with the bass reflex port 30, the unusual sound caused because of air flowing in the bass reflex port 30 can be sufficiently reduced.
  • the position and the timing where a whirl occurs dynamically change according to the air pressure difference that changes from moment to moment. For example, at a certain time, a whirl occurs at a position, closer to the center, on the end portion of the bass reflex port 30, and at another time different therefrom, a whirl occurs at a position, closer to the open end, on the end portion of the bass reflex port 30.
  • the frequency of the sound attributed to the whirl at the position, closer to the center, on the end portion of the bass reflex port 30 and the frequency of the sound attributed to the whirl at the position, closer to the open end, on the end portion of the bass reflex port 30 are different.
  • the bass reflex port 30 of the present embodiment since the position and the timing of occurrence of the whirl are dispersed, the unusual sound attributed to the concentration of occurrence of the whirl at a specific position and timing never becomes conspicuous, so that the unusual sounds of a plurality of frequencies in a predetermined frequency range like a continuous spectrum can be reduced. From this point, according to the bass reflex port 30 of the present embodiment, the unusual sound caused from the bass reflex port because of air flowing in the bass reflex port can also be sufficiently reduced compared with the conventional bass reflex port.
  • the sheet member 36 protrudes from the end 33 of the first tube 32 in such a manner that the space 38 is formed.
  • the wall surface of the internal side of the bass reflex port 30 can be made to have a softness desirable for appropriately deforming it according to the air pressure difference.
  • the cutouts 39 are provided on the portion serving as the outer wall surface.
  • the cutouts 39 are provided, compared with a case where the cutouts 39 are not provided, not only an advantage is obtained in that the sheet member 36 is easily fixed to the first tube 32 but also an advantage is obtained in that the unusual sound reduction effect can be enhanced since the sheet member 36 is readily deformed.
  • the sheet member 36 is not limited to felt but may be a sheet resin or the like. In short, any mode may be adopted as long as the sheet member 36 is made of a material lower in rigidity than the material of the tube 32. Moreover, while the sheet member 36 is fixed to the entire inner wall surface of the first tube 32 in the present embodiment, the sheet member 36 may be fixed to a part of the inner wall surface of the first tube 32. Moreover, the folded-back sheet member 36 may be fixed to the entire outer wall surface of the first tube 32 instead of being fixed to a part of the outer wall surface of the first tube 32.
  • FIG. 7 is a cross-sectional view showing the structure of a bass reflex port 30D of an acoustic device 1D provided with the bass reflex port 30D according to a fifth embodiment of this invention. Except for the bass reflex port 30D, the acoustic device 1D is similar to the acoustic device 1 of the first embodiment.
  • the bass reflex port 30D is different from the bass reflex port 30 of the first embodiment in that it has a sheet member 36D instead of the sheet member 36.
  • the sheet member 36D is partly fixed to the inner wall surface of the first tube 32, and extends so as to protrude from the end 33 of the first tube 32 in the extending direction of the first tube 32.
  • the end of the protrusion of the sheet member 36D is the internal side end of the bass reflex port 30D.
  • the portion of the sheet member 36D protruding from the first tube 32 constitutes the wall surface of the internal side end portion of the bass reflex port 30D.
  • the sheet member 36D is not folded back at the internal side end.
  • the bass reflex port 30D is similar to the bass reflex port 30 in that the wall surface of the internal side end portion is formed of the sheet member 36D with the sheet member 36D protruding from the end 33 of the first tube 32 to thereby make the rigidity of the wall surface of the internal side end portion smaller than that of the wall surface of the central portion.
  • the sheet member 36D on the internal side end portion moves randomly according to the air pressure difference, so that the bass reflex port 30D is deformed. Therefore, in the present embodiment, similar advantages to those of the first embodiment are obtained.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP17172712.6A 2016-05-25 2017-05-24 Bass reflex port and acoustic device Active EP3249947B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016104627A JP6709537B2 (ja) 2016-05-25 2016-05-25 バスレフポートおよび音響装置

Publications (2)

Publication Number Publication Date
EP3249947A1 EP3249947A1 (en) 2017-11-29
EP3249947B1 true EP3249947B1 (en) 2021-04-07

Family

ID=58772745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17172712.6A Active EP3249947B1 (en) 2016-05-25 2017-05-24 Bass reflex port and acoustic device

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EP (1) EP3249947B1 (ja)
JP (1) JP6709537B2 (ja)
CN (1) CN107438212B (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7066372B2 (ja) 2017-11-02 2022-05-13 シャープ株式会社 端末装置、基地局装置、および、通信方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334217A2 (en) * 1988-03-25 1989-09-27 Yamaha Corporation Method and apparatus of expanding acoustic reproduction range
JPH05268686A (ja) * 1992-03-17 1993-10-15 Matsushita Electric Ind Co Ltd バスレフポート

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JPS5663182U (ja) * 1979-10-22 1981-05-27
JPS58173989A (ja) 1982-04-05 1983-10-12 Hitachi Ltd 撮像装置
JPS58173989U (ja) * 1982-05-17 1983-11-21 松下電器産業株式会社 スピ−カ用位相反転型キヤビネツト
JPH0727751Y2 (ja) * 1988-09-28 1995-06-21 ヤマハ株式会社 音響装置
US5109422A (en) * 1988-09-28 1992-04-28 Yamaha Corporation Acoustic apparatus
JP2543231Y2 (ja) * 1991-01-18 1997-08-06 株式会社ケンウッド スピーカのダクトの構造
US5623132A (en) * 1995-08-18 1997-04-22 Precision Sound Products, Inc. Modular port tuning kit
JP2606960Y2 (ja) * 1996-05-13 2001-02-19 ヤマハ株式会社 音響装置
JP3514612B2 (ja) * 1997-07-18 2004-03-31 株式会社ケンウッド スピーカシステム
DE20309771U1 (de) * 2003-06-25 2003-09-18 Grosklaus Peter Bassreflexrohr
CN101754070B (zh) * 2008-11-28 2013-06-26 陆少锋 弹性体扬声器箱系统
JP5206617B2 (ja) * 2009-08-03 2013-06-12 トヨタ自動車株式会社 音制御装置及び音発生源
US20110176701A1 (en) * 2010-01-16 2011-07-21 Collins William E Autoaugmented Speaker Port
GB2488758A (en) * 2011-03-02 2012-09-12 Gp Acoustics Uk Ltd Bass reflex loudspeaker has acoustic leakage in walls of port duct
JP5915572B2 (ja) * 2013-03-15 2016-05-11 ヤマハ株式会社 バスレフポートおよび管体
JP2015019245A (ja) * 2013-07-11 2015-01-29 ヤマハ株式会社 バスレフポート
JPWO2015029303A1 (ja) * 2013-08-30 2017-03-02 ソニー株式会社 スピーカ装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334217A2 (en) * 1988-03-25 1989-09-27 Yamaha Corporation Method and apparatus of expanding acoustic reproduction range
JPH05268686A (ja) * 1992-03-17 1993-10-15 Matsushita Electric Ind Co Ltd バスレフポート

Also Published As

Publication number Publication date
CN107438212A (zh) 2017-12-05
JP6709537B2 (ja) 2020-06-17
EP3249947A1 (en) 2017-11-29
CN107438212B (zh) 2019-12-27
JP2017212606A (ja) 2017-11-30

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