WO1991019406A1 - Structure de haut-parleur - Google Patents

Structure de haut-parleur Download PDF

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Publication number
WO1991019406A1
WO1991019406A1 PCT/JP1991/000688 JP9100688W WO9119406A1 WO 1991019406 A1 WO1991019406 A1 WO 1991019406A1 JP 9100688 W JP9100688 W JP 9100688W WO 9119406 A1 WO9119406 A1 WO 9119406A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
cabinet
resonance
standing wave
speaker
Prior art date
Application number
PCT/JP1991/000688
Other languages
English (en)
Japanese (ja)
Inventor
Shunji Yoshida
Koji Nagai
Yoshitomo HONDA
Tadaaki SUGANO
Haruhisa Saito
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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 Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Publication of WO1991019406A1 publication Critical patent/WO1991019406A1/fr

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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
    • 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
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type 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 
    • H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Definitions

  • the present invention relates to a speaker device that absorbs a standing wave generated in a sound conduit or a cabinet and has a reproduced sound pressure frequency characteristic without a peak dip.
  • the speed-control device has a rectangular parallelepiped or a cabinet 2 having a shape close to that of the rectangular parallelepiped, and cuts off sound waves emitted from the back of the speaker unit 1 incorporated therein from the outside. Avoids interference with sound waves emitted from the front of speaker unit 1.
  • the standing wave generated in the sound pipe causes a peak-dip phenomenon in which the reproduced sound pressure frequency characteristic has many peaks and troughs in the waveform. There is something to scrape.
  • this phenomenon is likely to occur when the length of the sound conduit 5 cannot be long enough for the wavelength of the reproduced sound pressure frequency band. Specifically, as shown in FIG. 35, this phenomenon is caused by a standing wave generated in the sound conduit 5.
  • a standing wave indicated by is generated in the sound conduit 5, and the standing wave causes a peak dip in the reproduced sound pressure frequency characteristic.
  • Japanese Unexamined Utility Model Publication No. Hei 11-78487 discloses a method of filling the inner wall of a horn or a sound pipe with a sound absorbing material, or using a sound absorbing material for a horn or sound.
  • a flat characteristic without peaks and dips due to standing waves can be obtained in a speaker system with a short horn or a sound conduit.
  • FIG. 36 and FIG. 37 are a part of the drawing disclosed in the above-mentioned actual opening / closing No. 1 178 487, and are a vertical sectional view and a sound of the speaker device built in the television receiver.
  • FIG. 3 shows a plan view of a conduit.
  • 1 is a speaker unit and 1 2 is a speaker unit.
  • a cabinet with a built-in socket, 15 is a box-shaped sound-conducting housing, 34 is a sound-absorbing material fixed in the sound-conducting housing 15, and 14 is one end surrounded by this sound-absorbing material 34
  • the sound output room 14 a is the sound output surface of the sound output room 14.
  • the standing wave generated in the sound emitting chamber 14 is absorbed by the sound absorbing material 34, but the sound absorbing material also partially absorbs the high frequency range frequency component of the reproduced sound pressure frequency characteristic, thereby reproducing the high frequency range. There is a problem that the sound pressure level decreases. A detailed description is omitted. Disclosure of the invention
  • the present invention has been made in view of the above-mentioned conventional problems, and has as its object to consume energy by resonating a standing wave generated inside a cabinet or a sound pipe with a resonator. Accordingly, it is an object of the present invention to provide a loudspeaker device in which the standing wave is efficiently eliminated so that the reproduced sound pressure frequency characteristic has no peak and dip.
  • the speaker device of the present invention is provided with a resonance means for resonating with a standing wave generated inside a part of a sound pipe provided on a front surface of a cabinet or a speaker unit.
  • the resonance means includes a resonance wave that resonates with the predetermined standing wave and a resonance selection means that selects a resonance position.
  • FIGS. 1 to 32 are diagrams showing a preferred embodiment of a speaker device according to the present invention.
  • FIG. 1 is a diagram showing a preferred embodiment of a speaker device having a Helmholtz resonator mounted outside a cabinet.
  • FIG. 2 is a vertical sectional view showing an embodiment
  • FIG. 3 is a vertical sectional view showing a preferred embodiment of a speaker device equipped with a Ruth-type resonator;
  • FIGS. 3 to 7 show different selection means for changing the resonance frequency or resonance position of the Helmholtz-type resonator;
  • FIG. 8 is a vertical sectional view showing a preferred embodiment of a speaker device in which a Helmholtz type resonator is attached to a sound conduit, and
  • FIG. 1 is a diagram showing a preferred embodiment of a speaker device having a Helmholtz resonator mounted outside a cabinet.
  • FIG. 2 is a vertical sectional view showing an embodiment
  • FIG. 3 is a vertical sectional view showing a preferred
  • FIG. 9 is a sectional view of the embodiment shown in FIG. Fig. 10 is an output characteristic diagram
  • Fig. 10 is an output characteristic diagram of the embodiment shown in Fig. 6,
  • Fig. 11 is a vertical diagram showing another preferred embodiment of a speaker device in which a Helmholtz resonator is attached to a sound conduit.
  • FIG. 12 is a cross-sectional view
  • FIG. 12 is an output characteristic diagram of the embodiment shown in FIG. 11,
  • FIGS. 13 (A) and (B) are diagrams showing a Helmholtz-type resonator and its equivalent circuit. Is another speaker system with two Helmholtz resonators attached to a sound conduit.
  • FIG. 15 is a vertical sectional view showing a preferred embodiment
  • FIG. 15 is a vertical sectional view showing a preferred embodiment
  • FIG. 15 is an output characteristic diagram of the embodiment shown in FIG. 14, and FIGS. 16 (A), (B) and (C) are Helmholtz-shaped sound pipes.
  • FIG. 17 shows a preferred embodiment in which a speaker device equipped with a resonator is used for a television receiver.
  • FIG. (B) is a cross-sectional view of a speaker device showing another embodiment corresponding to FIGS. 17 (A) and (B), and FIGS. 19 and 20 are phase-inverting ports on the cabinet.
  • -Sectional views of a speaker device showing another embodiment each provided with a light pipe Figs. 21 and 22 correspond to Figs. 17 (B) and 18 (B), respectively.
  • FIG. 23 is a cross-sectional view of a speaker device showing another embodiment in which a sound absorbing filter is provided in the communication pipe
  • FIG. 23 is a characteristic diagram of the embodiment shown in FIG. 21, and FIGS. 24 to 29 are And other examples using a drone cone are shown.
  • FIG. 30 is a cross-sectional view of a main part of a speaker device of an embodiment using a drone cone with an electromagnetic braking device;
  • FIG. 31 is an equivalent circuit diagram of FIG. 30;
  • FIG. 32 is a characteristic diagram of the embodiment shown in FIG. 30,
  • FIG. 33 to FIG. 37 are diagrams showing a preferred embodiment of the conventional speaker device, and
  • FIG. Fig. 34 is a cross-sectional view of a conventional standard speaker device having a sound conduit, and Fig. 35 is a sectional view of a standing wave generated in the sound conduit.
  • FIG. 36 is a cross-sectional view of a conventional speaker device used in a television receiver, and
  • FIG. 37 is a plan view of the sound guide housing of FIG.
  • reference numeral 1 denotes a speaker unit
  • 2 denotes a cabinet containing the speaker unit
  • 3 denotes a Helmholtz resonator provided in a part of the cabinet
  • 3a denotes the inside of the main body and the cabinet 2.
  • a communication pipe communicating with the inside, 3b is an air chamber of the resonator body connected by the communication pipe.
  • the Helmholtz resonator 3 may be provided outside the cabinet 2 as shown in FIG. 1, or may be provided inside the cabinet 2 as shown in FIG.
  • Fig. 3 shows an embodiment in which the volume V of the air chamber 3b is made variable
  • Fig. 4 shows an embodiment in which the length £ of the communication pipe 3a is made variable
  • Fig. 5 shows a slide lid.
  • FIG. 6 shows an embodiment in which the cross-sectional area S of the communication pipe 3a is made variable by using 4 and FIG. 6 shows an embodiment in which the position of the Helmholtz resonator 3 is made variable, and FIG. 7 shows a slide lid. 4 using Helmhol FIG. 8 shows an embodiment in which the number of resonators is made variable, and FIG. 8 shows that a Helmholtz resonator 3 similar to the above is provided in a part of the sound conduit 5 provided in front of the speed unit 1.
  • This embodiment shows another embodiment of the present invention, and the same structure as that shown in FIGS. 3 to 7 is adopted.
  • the air therein causes a resonance phenomenon.
  • the air in the communication pipe violently moves in and out, so that the sound energy is converted to heat energy here, so that it exhibits a sound absorbing effect at the resonance frequency. Therefore, if the above-mentioned Helmholtz resonator is installed at an appropriate position in the sound conduit in front of the cabinet or speaker unit in accordance with the frequency at which the standing wave rises or the frequency at which the sound is to be absorbed, the sound absorbing effect can be obtained. As a result, the performance can be improved as shown in Fig. 9.
  • A indicates a flat output sound pressure with a resonator
  • B indicates an output sound pressure with a peak dip without a resonator
  • a and b respectively indicate It shows the impedance with respect to.
  • the specified frequency is (when the communication pipe is cylindrical)
  • the degree of sound absorption can be adjusted as shown in FIG. 10 by moving the position. That is, in the characteristic line in the figure, A and B are the output sound pressures with the resonator, B is the output sound pressure when the position is moved, C is the output sound pressure without the resonator, and a, b, and c indicate the corresponding impedances.
  • FIGS. 11 to 15 is an improvement of the embodiment shown in FIG. 8 in which a sound conduit 5 with a Helmholtz resonator 3 is attached to the front of a speaker unit 1 built in a cabinet 2.
  • the position of the Helmholtz resonator 3 mounted on the side wall of the sound conduit 5 is mounted on the speaker unit side in an area within 12 of the length of the sound conduit.
  • FIG. 14 shows another preferred embodiment of the present invention having one resonator and FIG. 14 shows two resonators.
  • the resonance frequency and Although the position is fixed, it is needless to say that the configurations shown in FIGS. 3 to 7 can be adopted as needed.
  • the same reference numerals as those in the above-described embodiment denote the same or corresponding parts, and a description thereof will be omitted (the same applies hereinafter).
  • the rear surface of the diaphragm of the speaker unit 1 is closed by the cabinet 2.
  • the sound wave radiated to the front surface of the diaphragm is guided to the sound emission surface through the sound conduit 5 and emitted.
  • a sudden change in the acoustic impedance that occurs on the sound emitting surface causes a standing wave to be generated inside the sound conduit, and the reproduced sound pressure frequency characteristic has many peaks and valleys with peaks and dips.
  • a Helmholtz resonator 3 is provided in the above-mentioned area within 1 to 2 of the length of the sound conduit 5 to attenuate the frequency of the first mode that has the greatest effect on sound quality among these standing waves. This prevents standing waves from being generated.
  • FIGs 13 (A) and 13 (B) show the Helmholtz resonator 3 and its equivalent circuit.
  • 6 is the driving pressure radiated from the communication pipe 3a
  • 7 is the acoustic radiation resistance
  • 8 is the impedance of the opening of the communication pipe 3a
  • 9 is the volume of the air chamber 3b. It is capacity.
  • the embodiment shown in FIG. 11 of the present invention employs the following parameters.
  • the parameter of the resonator tuned to this frequency is the radius of the communication pipe 3 a '0.8 cm
  • the volume of the air chamber 3 b ⁇ 3600 cm 3 is obtained.
  • the peak due to the primary standing wave generated at 340 Hz in the reproduced sound pressure frequency characteristic in the conventional example has a flat characteristic (A in the figure) according to the present invention.
  • the Helmholtz resonator Shall be provided on the inner wall surface of the sound conduit 5 on the front side of the diaphragm within the area within 12 of the length of the sound conduit 5 between the front surface of the diaphragm and the sound emission surface where the sound pressure due to the standing wave rises. The effect is better.
  • two Helmholtz resonators 3 are positioned on the inner wall of the sound pipe 5 on the front side of the diaphragm so as to be positioned one behind the other within a range of 1 to 2 of the length of the sound pipe 5.
  • 13 and 13 are provided.
  • a Helmholtz resonator including a communication pipe 3a and an air chamber 3b is provided inside the sound conduit 5 in accordance with the frequency at which the primary standing wave is generated.
  • another Helmholtz resonator 13 composed of a communication pipe 13a and an air chamber 13b is provided in the same region, which is adapted to the frequency at which the secondary standing wave is generated. The second standing wave is prevented from being generated.
  • This embodiment employs the following parameters.
  • the reproduction frequency characteristic shows a peak near 3400 Hz in the first standing wave, and near 800 Hz due to the second standing wave in the sound conduit 5. There is also a peak.
  • Each parameter of the Helmholtz resonator tuned to this frequency is
  • the acoustic mass of the Helmholtz resonators 3, 13 can be constituted by the communication pipes 3a, 13a, or alternatively by a drone cone (refer to an embodiment described later).
  • FIG. 16 (A) is a plan view when the speaker device of the present invention is used for a television receiver 50
  • FIG. 16 (B) is a front view thereof
  • FIG. 16 (C) is a vertical cross-sectional view of the present invention
  • Fig. 17 (B) is a horizontal cross-sectional view of the sound guide housing. It is.
  • the speaker unit 1 and the cabinet 12 containing the speaker unit 1 are attached to the front of the baffle plate 11, and the sound guide housing 15 is attached to the front of the baffle plate 11. It is installed in parallel with 1 and the space formed between them is a central sound emission chamber 14 and its partition wall (which functions as a sound pipe) 16 Outside air chamber (which serves as the main air chamber of the Helmholtz resonator) for absorbing the standing wave in the sound conduction enclosure 15 communicated through It is unique in that it is developing.
  • FIGS. 18 (A) and 18 (B) show another embodiment of the present invention.
  • the opening of the sound guide housing 15 is provided in front of the baffle plate 11.
  • the difference is that the sound is radiated straight from the speaker unit 1 by installing it, but the other configurations are the same as those shown in Figs. 17 (A) and 17 (B). It is the same as the one.
  • the cabinet 12 does not have a port tube for phase inversion.
  • the cabinet 12 may be a phase inversion type cabinet having a boat tube (see an embodiment described later). In this case, the bass range can be further improved.
  • FIG. 19 shows another preferred embodiment of the present invention, in which a port tube 19 for phase inversion is provided in the cabinet 12 of the embodiment shown in FIG.
  • the port tube 19 is a hollow one open at both ends, and one end is fixedly connected to a cabinet 12 having a built-in speaker unit 1 so that air enters and exits.
  • the other end 19a is arranged adjacent to the sound emission surface 14a of the sound guide housing 15.
  • the rear sound pressure of the speaker force 1 is guided to the sound emitting surface 19a.
  • the low-frequency range of the virtual coaxial is reproduced.
  • FIG. 20 is a modification of the present invention, in which the shape of the partition wall 16 of the sound guide housing 15 is formed into a curved horn shape, and is further compared with the above-described embodiment shown in FIG. The reflection of the sound that causes the multi-order standing wave at the point is suppressed, and good sound pressure frequency characteristics can be obtained.
  • FIGS. 21 and 22 show another embodiment of the present invention. This embodiment is similar to FIGS. 17 (A), (B) and 18 (A) described above.
  • the sound absorbing filter 20 is provided in the through hole 17 provided in the partition 16 of the sound conducting case 15 of the embodiment shown in (B), and in this embodiment, a continuous foam is used as the sound absorbing filter 20. It is made of urethane and has a thickness of 2 mm.
  • the amount of air flowing through the through-hole 1 can be further adjusted by this sound absorbing filter 20.
  • a flat sound pressure frequency characteristic with a small dip can be obtained as shown in Fig. 23.
  • FIG. 23 the horizontal axis shows frequency, and the vertical axis shows output sound pressure level.
  • the conventional example without the through hole 17 in the partition 16 is curve A, and the prize through hole 17 is in the partition 16
  • the embodiment shown in FIGS. 17 and 18 is shown by a curve B, and the embodiment in which the sound absorbing filter 20 is provided in the through hole 1 ⁇ ⁇ shown in FIGS. 21 and 22 is shown by a curve C.
  • curve A is a waveform having primary and secondary peak dips.
  • the first and second peaks of the curve A are inverted so that the resonance is excessive and the peak is a dip.
  • curve C these peak-dip portions are flat as a whole, and have a smooth characteristic curve with no peak-dip.
  • reference numeral 21 denotes a drone cone, which is mounted on the partition 16 of the sound guide housing 15.
  • the front face of the drone cone 21 is opposed to the sound emission chamber 14 of the sound guide housing 15, and the back is housed in a closed air chamber 18.
  • the drone cone 21 has a frame 23 fixed to a partition 16 of a sound guide housing 15 with screws, and a diaphragm 24 supported by an edge 25.
  • a bobbin 26 is fixed to the back surface of the diaphragm 24, and the bobbin 26 is supported on the frame 23 by a spider 27.
  • the diaphragm 24 of the drone cone 21 vibrates in response to the sound pressure from the sound emission chamber 14, and the energy of the sound that moves the diaphragm 24 is absorbed.
  • the oscillating frequency is limited to the resonance frequency f of the drone cone 21 shown by the following equation.
  • the resonance frequency f of the drone cone 21 is adjusted to match the frequency at which the sound pressure generated in the sound emission chamber 14 becomes the peak.
  • This adjustment can be achieved by increasing or decreasing the mass of the diaphragm 24 of the drone cone 21 and adjusting the compliance of the support system such as the spider 27 and the edge 25. In this way, the drone cone 2 1 attenuates only the peak at a specific frequency in the mid-low range. Will be able to
  • FIGS. 26 to 29 show another embodiment of the present invention.
  • Fig. 26 shows a sound guide case 15 with one drone cone 21 mounted almost vertically to the baffle plate 11, and there is little obstruction of sound emission from the speaker unit. This improves radiation efficiency in the high frequency range.
  • Figs. 27 and 28 show two drone cones 21 provided to increase the sound absorption.
  • Fig. 27 shows the sound guide housing 15 mounted almost vertically on the baffle plate 11
  • Fig. 28 is similarly arranged in parallel.
  • FIG. 29 shows another preferred embodiment of the present invention, in which the back of one of the two drone cones 21 is housed.
  • the air chamber 18 A is made narrower than the other air chamber 18.
  • the resonance frequencies of the drone cones 21 differ from each other, and it becomes possible to absorb the peaks of a plurality of frequencies.
  • the resonance frequency can also be adjusted by adjusting the compliance of the spider 27 and the edge 25 of the drone cone 21 itself as described above.
  • FIG. 30 shows another embodiment of the present invention.
  • reference numeral 31 denotes a magnetic circuit fixed to the back of a drone cone 21; a magnet 31a, a top plate 31b And a pole 3 1 c with a bottom plate.
  • Reference numeral 32 denotes a coil provided in the bobbin 26 disposed in the magnetic gap of the magnetic circuit 31. Both ends of the coil 32 are connected to the variable resistor 34 by lead wires 33.
  • the coil 32 vibrates due to the resonance of the drone cone 21 to generate a voltage, and a current flows to the variable resistor 34 through the lead wire 33.
  • the variable resistor 34 By adjusting the variable resistor 34, the current changes, and the electromagnetic force between the coil 32 and the magnetic circuit 31 changes.
  • a braking force can be applied to the vibration of the drone cone 21, and the amount of damping of the resonance vibration of the drone cone 21 can be increased in addition to the mechanical resistance of the drone cone 21 itself.
  • the amount of increase is also adjustable, and the amount of acoustic energy absorbed is also adjustable, making it easier to flatten sound pressure frequency characteristics.
  • FIG. 31 is an equivalent circuit diagram of FIG. 30.
  • Driving force dynamic m a vibration system equivalent mass of the drone cone 2 1, r.
  • c c is the compliance of the cabinet 12
  • r v is the resistance of the variable resistor 34.
  • the resonance frequency of the drone cone 21 is determined by the following equation, and can be easily adjusted by increasing or decreasing the mass, the volume of the air chamber 18 and the like. Moreover, the braking of the drone cone 2 1, (2 ⁇ fm a / ( r a + rv) by Ri is determined to be adjusted Ri by increasing or decreasing the resistive r v.
  • Curve A shows the conventional device, with a peak at about: 0 Hz.
  • Curve B shows the total resonance frequency.
  • the curve C is matched with both the resonance frequency J3 ⁇ 4 and the braking amount, resulting in a flat characteristic.
  • the speaker device of the present invention can be applied not only to a sound reproducing device of a television receiver but also to a sound reproducing device requiring a high-quality revoiced sound, such as a general home stereo device and a vehicle-mounted stereo device. .

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

Structure de haut-parleur apte à absorber une onde stationnaire dans une enceinte (2) ou dans un tuyau de guidage sonore (5) afin de créer une réponse en fréquence dépourvue de pointes et de dépressions. La structure comprend, dans le tuyau (5) ou l'enceinte (2), un dispositif résonnant (3) qui résonne avec l'onde stationnaire dans ce tuyau (5) ou cette enceinte (2), et qui éteint l'énergie de ladite onde stationnaire. Le dispositif résonnant est doté d'un moyen de sélection d'une onde de résonance résonnant avec l'onde stationnaire et d'une position de résonance.
PCT/JP1991/000688 1990-05-25 1991-05-23 Structure de haut-parleur WO1991019406A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP5417190 1990-05-25
JP2/54171U 1990-05-25
JP2/89548U 1990-08-29
JP8954890 1990-08-29
JP40617990 1990-12-07
JP2/406179 1990-12-07
JP3/45690 1991-02-20
JP4569091 1991-02-20

Publications (1)

Publication Number Publication Date
WO1991019406A1 true WO1991019406A1 (fr) 1991-12-12

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PCT/JP1991/000688 WO1991019406A1 (fr) 1990-05-25 1991-05-23 Structure de haut-parleur

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Cited By (19)

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Publication number Priority date Publication date Assignee Title
EP0744880A1 (fr) * 1995-05-26 1996-11-27 SANYO ELECTRIC Co., Ltd. Dispositif de haut-parleur et récepteur de télévision utilisant le même
GB2302231A (en) * 1995-03-14 1997-01-08 Matsushita Electric Ind Co Ltd Acoustic duct for a loud speaker with a holed resonance cavity
GB2325586A (en) * 1995-03-14 1998-11-25 Matsushita Electric Ind Co Ltd An acoustic duct for a loudspeaker wherein a partition board forms a cavity with the side of the duct
EP0880300A2 (fr) * 1997-05-24 1998-11-25 Celestion International Limited Pavillon acoustique pour haut-parleurs
JP2007531448A (ja) * 2004-04-01 2007-11-01 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 分散された音響キャビネット
US7565948B2 (en) 2004-03-19 2009-07-28 Bose Corporation Acoustic waveguiding
JP2009177748A (ja) * 2008-01-28 2009-08-06 Panasonic Electric Works Co Ltd 通話装置
US7584820B2 (en) 2004-03-19 2009-09-08 Bose Corporation Acoustic radiating
JP2013126250A (ja) * 2011-12-15 2013-06-24 Apple Inc スピーカ性能改善のための減衰型拡張ダクト
WO2014004617A1 (fr) * 2012-06-27 2014-01-03 Bose Corporation Haut-parleur avec filtre acoustique
JP2014175807A (ja) * 2013-03-07 2014-09-22 Yamaha Corp 音響装置
JP2016157142A (ja) * 2011-03-04 2016-09-01 ヤマハ株式会社 電子鍵盤楽器
JPWO2015145774A1 (ja) * 2014-03-28 2017-04-13 パイオニア株式会社 スピーカシステム
DE102017214404A1 (de) * 2017-08-18 2019-02-21 Audi Ag Lautsprecheranordnung und Fahrzeug
US10299032B2 (en) 2017-09-11 2019-05-21 Apple Inc. Front port resonator for a speaker assembly
RU2707905C2 (ru) * 2018-04-02 2019-12-03 Игорь Анатольевич Савин Акустическая система с щелевым настраиваемым резонатором гельмгольца
US11451902B1 (en) 2021-05-07 2022-09-20 Apple Inc. Speaker with vented resonator
US11490190B1 (en) 2021-05-07 2022-11-01 Apple Inc. Speaker with multiple resonators
US11640816B1 (en) * 2022-02-23 2023-05-02 Acoustic Metamaterials LLC Metamaterial acoustic impedance matching device for headphone-type devices

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JPS571196B2 (fr) * 1977-01-14 1982-01-09
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JPS6161597B2 (fr) * 1980-03-10 1986-12-26 Matsushita Electric Ind Co Ltd
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JPS571196B2 (fr) * 1977-01-14 1982-01-09
JPS5434228A (en) * 1977-08-22 1979-03-13 Sony Corp Back load horn speaker system
JPS56125189A (en) * 1980-03-07 1981-10-01 Matsushita Electric Ind Co Ltd Speaker system
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Cited By (31)

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GB2302231B (en) * 1995-03-14 1999-01-13 Matsushita Electric Ind Co Ltd Speaker system
GB2325586B (en) * 1995-03-14 1999-01-13 Matsushita Electric Ind Co Ltd Speaker system
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JPWO2015145774A1 (ja) * 2014-03-28 2017-04-13 パイオニア株式会社 スピーカシステム
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US11490190B1 (en) 2021-05-07 2022-11-01 Apple Inc. Speaker with multiple resonators
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