EP0744880A1 - Loudspeaker device and television receiver using the device - Google Patents

Loudspeaker device and television receiver using the device Download PDF

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Publication number
EP0744880A1
EP0744880A1 EP96108264A EP96108264A EP0744880A1 EP 0744880 A1 EP0744880 A1 EP 0744880A1 EP 96108264 A EP96108264 A EP 96108264A EP 96108264 A EP96108264 A EP 96108264A EP 0744880 A1 EP0744880 A1 EP 0744880A1
Authority
EP
European Patent Office
Prior art keywords
speaker
sound
sound tube
tube
closed end
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.)
Withdrawn
Application number
EP96108264A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yoshida Tomonori
Harada Haruhiko
Nagai Akira
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.)
Bakuun Products Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Bakuun Products Co Ltd
Sanyo Electric Co Ltd
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 Bakuun Products Co Ltd, Sanyo Electric Co Ltd filed Critical Bakuun Products Co Ltd
Publication of EP0744880A1 publication Critical patent/EP0744880A1/en
Withdrawn legal-status Critical Current

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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
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means

Definitions

  • the present invention relates to loudspeaker devices comprising a loudspeaker and a sound tube connected thereto, and to television receivers having such devices.
  • television receivers comprise a cathode-ray tube 11 accommodated in a cabinet 1, and a pair of opposite loudspeakers 12 arranged in dead spaces inside the cabinet 1 around the cathode-ray tube 11.
  • the sound waves emitted by each speaker 12 are guided to the front side of the cabinet 1 by a sound tube 13 connected to the speaker 12.
  • speakers 12 of increased diameter are also in use.
  • the speakers 12 can not be entirely accommodated in the above-mentioned dead spaces inside the cabinet 1, and there arises a need, for example, to bulge the side walls of the cabinet 1. This gives rise to the problem of increasing the lateral width of the cabinet 1.
  • the large speaker 12 can then be disposed in the dead space inside the cabinet 1 in a compact arrangement.
  • the speaker device shown in FIG. 23 has the problem of impaired acoustic characteristics especially at medium frequencies since the sound waves radiated by the speaker 12 are deflected at a large angle close to 90 degrees and then guided into the sound tube 14.
  • the sound waves radiated from the speaker 12 and guided into the sound tube 13 or 14 are thereafter forwardly released from the open end of the sound tube. At this time, some of the sound waves are reflected owing to a marked change in the acoustic impedance at the tube open end and return toward the speaker 12 to produce standing waves.
  • a speaker device wherein a sound tube is internally provided with a sound absorbing material surrounding the sound wave radiating portion of a speaker and adapted to absorb standing waves (Unexamined Japanese Patent Publication HEI 5-168082).
  • this device is unable to effectively absorb standing waves since the sound waves traveling toward the front face of the speaker upon reflection fail to impinge on the absorbing material.
  • An object of the present invention is to provide a loudspeaker device wherein the wave guide direction of a sound tube is inclined with respect to the direction of radiation of sound waves from a speaker and which is adapted to effectively absorb standing waves so as to realize satisfactory acoustic characteristics over a wide range of low to high frequencies.
  • the present invention provides a loudspeaker device which comprises a loudspeaker 3 and a sound tube 4 having an open end and a closed end opposite thereto and connected to a sound wave radiating portion of the speaker.
  • the speaker 3 is attached to a side wall of the sound tube 4, and the sound tube 4 has a wave guide direction intersecting the direction of radiation of sound waves from the speaker 3.
  • the speaker 3 is attached to the sound tube 4 at a position intermediate between the closed end and the open end.
  • the standing wave occurring in the interior of the sound tube 4 has a node at the closed end of the sound tube 4 and an antinode at the open end thereof, and one or a plurality of antinodes occur also between the closed end and the open end to effect resonance. Accordingly, with the conventional device wherein the speaker is attached to the closed end portion of the sound tube, the position of attachment is opposed to the position of the node of the standing wave, permitting the speaker drive force to efficiently contribute to the occurrence of standing waves, hence occurrence of great standing waves.
  • the speaker 3 is attached to the sound tube 4 at an intermediate portion between the closed end and the open end, and the position of attachment is opposed to the position of one antinode of the standing wave. This reduces the speaker drive efficiency as to standing waves, consequently suppressing standing waves and improving the acoustic characteristics especially at medium frequencies.
  • the speaker 3 is attached to the sound tube 4 at a position spaced apart from the closed end toward the open end by a distance corresponding to about 1/3 of the entire length of the sound tube 4.
  • the position of antinode of the standing wave is, for example, spaced apart from the closed end toward the open end by a distance corresponding to about 1/3 of the entire length of the sound tube 4.
  • the position of attachment of the speaker 3 is opposed to the position of antinode of a three-quarter wavelength standing wave, whereby the resonance of the three-quater wavelength standing wave is effectively inhibited.
  • the sound tube 4 is packed with a sound absorbing material 5 in an interior portion thereof closer to the closed end than the position of attachment of the speaker 3. With this specific arrangement, all the reflected waves returning from the open end of the sound tube 4 are absorbed by the sound absorbing material 5 upon impinging thereon.
  • the wave guide channel of the sound tube 4 is approximately constant or increases in cross sectional area from the position of attachment of the speaker 3 toward the open end.
  • the wave guide channel of the sound tube 4 further decreases in cross sectional area from the position of attachment of the speaker 3 toward the closed end.
  • the cross sectional size of the sound tube open end where reflected waves occur differs from that of the sound tube closed end to be eventually reached by the reflected waves, so that this asymmetry attenuates the reflected waves at the closed end.
  • the sound tube 4 is provided on an inside wall thereof with a frustoconical protuberance 6 bulging toward the speaker 3 and opposed to the sound wave radiating portion thereof. Whereas the recessed shape of the speaker diaphragm produces a marked change in the cross sectional area of the wave guide channel at the outlet of the speaker 3, the change is offset by the protuberance 6 of the above specific construction. This diminishes the variation of the acoustic impedance at the connection between the speaker 3 and the sound tube 4.
  • the sound tube 4 is internally provided with a reflector 7 at a specified position closer to the closed end than the position of attachment of the speaker 3 for partly blocking the wave guide channel at the specified position.
  • This specific arrangement is effective for affording improved acoustic characteristics at high frequencies, realizing well-balanced acoustic characteristics at medium to high frequencies.
  • terminals 32, 32 for passing current through the speaker 3 are supported on a frame 30 at a position away from the center of the speaker 3 toward the open end of the sound tube 4, and litz wires 33, 33 extend from the respective terminals 32, 32 toward a diaphragm 31.
  • the imbalance of the sound pressure resistance relative to the diaphragm 31 of the speaker 3 i.e., the imbalance of the sound pressure resistance that is greater at the closed end side than at the open end side, is offset by an increase in the equivalent mass due to the weight of the litz wires 33 extending from the terminals 32 to the diaphragm 31 and lead wires, and the weight of solder for fixing the litz wires 33 to the lead wires. Consequently, the diaphragm 31 vibrates only unidimensionally along the direction of radiation of sound waves, whereby a distortion-free high sound quality is available.
  • the invention provides a television receiver having housed in a cabinet 1 a cathode-ray tube 11 and a pair of loudspeaker devices 2, 2 arranged at opposite sides of the cathode-ray tube 11, each of the speaker devices 2 comprising a loudspeaker 3 disposed in an inner portion of the cabinet 1 and directed laterally, and a sound tube 4 connected to a sound wave radiating portion of the speaker 3 and extending from a closed end in an inward portion of the cabinet 1 to an open end at the front side of the cabinet 1.
  • the speaker 3 is attached to a side wall of the sound tube 4, and the sound tube 4 has a wave guide direction intersecting the direction of radiation of sound waves from the speaker 3.
  • the speaker 3 is attached to the sound tube 4 at a position intermediate between the closed end and the open end.
  • the televation receiver embodying the present invention has inside the cabinet 1 the pair of speaker devices 2, 2 arranged at opposite sides of the cathode-ray tube 11, with the speakers 3 arranged as directed laterally in the inner portion of the cabinet 1 remote from its front side, so that the speakers 3, even if having an increased diameter, can be compactly arranged utilizing dead spaces without necessitating a cabinet 1 of larger lateral width. Further because the speaker 3 of each speaker device 2 is attached to the sound tube 4 at a position intermediate between the closed end and the open end, standing waves are inhibited effectively.
  • FIG. 1 shows a television receiver embodying the invention and incorporating loudspeaker devices 2 of the invention therein.
  • the speaker devices 2, 2 in an opposed pair are arranged on opposite sides of a cathode-ray tube 11 in the interior of a cabinet 1.
  • Each speaker device 2 comprises a loudspeaker 3 disposed as directed laterally in an inner portion of the cabinet 1 remote from its front side utilizing a dead space inside the cabinet 1, and a sound tube 4 having a closed end in an inward portion of the cabinet 1 and an open end facing the front side of the cabinet 1.
  • the front side of the speaker 3 is attached to a side wall of the sound tube 4.
  • the speaker 3 is a common cone dynamic speaker as seen in FIG. 2 and has a diaphragm 31 in the form of a cone of paper and supported by a damper on a frame 30.
  • the diaphragm 31 is driven by passing current through the speaker via a pair of terminals 32,32.
  • the speaker 3 is attached to the sound tube 4 at a position spaced apart from the closed end toward the open end by a distance corresponding to 1/3 of the entire length of the sound tube 4.
  • the sound tube 4 comprises the combination of a first panel 41 and a second panel 42, so that the two panels 41, 42 define a forward wave guide channel 43 extending from the position of the speaker 3 toward the open end, and a rearward wave guide channel 44 extending from the position of the speaker 3 toward the closed end.
  • the width of the forward wave guide channel 43 of the sound tube 4 increases toward the open end according to a predetermined function, and at the same time, the thickness thereof decreases toward the open end in reciprocal relation to the function, with the result that the channel 43 remains constant in cross sectional area from the position of attachment of the speaker 3 to the open end. Consequently, the open end of the sound tube 4 has a vertically elongated slender rectangular opening at the front side of the cabinet 1. This minimizes the increase of the lateral width of the cabinet 1.
  • the rearward wave guide channel 44 of the sound tube 4 gradually decreases in cross sectional area toward the closed end.
  • the rear portion of the channel 44 is packed with a sound absorbing material 5.
  • a circular aperture 45 for admitting sound waves from the speaker 3 into the sound tube 4 therethrough is formed in the first panel 41 at the position where the speaker 3 is attached to the tube 4.
  • the second panel 42 has a frustoconical protuberance 6 in conformity with the shape of the speaker diaphragm 31, opposed to the circular aperture 45 of the first panel 41 and bulging toward the speaker 3.
  • FIGS. 5 and 6 show a loudspeaker device which has a pair of reflectors 7, 7 spaced apart from each other and arranged at the inlet of the rearward wave guide channel 44 of the sound tube 4.
  • the channel 44 is similarly packed with a sound absorbing material 5 to the rear of these reflectors 7, 7.
  • FIGS. 7 and 8 show a loudspeaker device wherein the terminals 32, 32 of the speaker 3 are supported on the frame 30 at a position away from the center of the speaker 3 toward the open end of the sound tube 4.
  • Litz wires 33, 33 extend from the respective terminals 32, 32 toward the diaphragm 31.
  • FIGS. 9 and 10 were prepared to substantiate the advantages of the speaker devices described above by experiments.
  • FIGS. 11 to 21 show the results of the experiments.
  • the experimental speaker device had an experimental sound tube 8 with a constant cross sectional area over the entire length of its wave guide channel and a speaker 3 attached to a side wall of the tube 8, and was basically the same as the speaker device of the invention in construction.
  • a microphone 9 was installed as opposed to the open end of the sound tube 8 to determine the sound pressure-frequency characteristics.
  • the experimental sound tube 8 was 350 mm in overall length and had a rectangular cross section measuring 105 mm x 50 mm.
  • the microphone 9 was spaced apart from the open end of the sound tube 8 by 10 mm.
  • FIG. 11 shows standing waves occurring in a sound tube of constant cross sectional area.
  • the frequencies F1, F2 and F3 at which a quarter-wavelength standing wave, three-quarter wavelength standing wave and five-quarter wavelength standing wave occur respectively are as follows.
  • the frequency characteristics of sound waves released from the sound tube involve repeated marked peak dips at medium to high frequencies as indicated in a solid line, hence disturbed characteristics.
  • the solid-line frequency characteristics were calculated by computer simulation.
  • FIGS. 15 and 14 were obtained from the results of experiments conducted for an A-type device wherein the speaker was installed at a position 1/3 of the entire length of the sound tube away from the closed end and for a B-type device wherein the speaker was positioned 1/2 of the tube length away from the closed end, as shown in FIG. 13 respectively.
  • the experimental result of FIG. 15 also reveals that the peak at medium frequencies of around 729 Hz remarkably diminishes, substantiating the advantage of the speaker device of the invention.
  • FIG. 16 shows a D-type experimental speaker device wherein the sound tube is packed with a sound absorbing material in the rear portion thereof.
  • FIG. 17 shows the frequency characteristics of the device determined.
  • peak dips are effectively suppressed at medium to high frequencies. This appears attributable to the fact that the sound waves returning upon reflection at the open end of the sound tube impinge on and are absorbed by the sound absorbing material without leaking, whereby the resonance of standing waves is inhibited.
  • FIG. 18 shows an E-type speaker device wherein the sound tube has a protuberance conforming to the shape of the diaphragm and opposed to the speaker.
  • FIG. 19 shows the frequency characteristics of the device determined.
  • the device exhibits higher sound pressures than the D-type speaker device (broken line) over the range of 800 Hz to 2500 Hz. This is thought attributable to the following reason.
  • the wave guide channel has an abruptly enlarged portion defined by the recessed diaphragm, whereas with the E-type device, the cross sectional area of the wave guide channel at the speaker outlet is made to vary uniformly by the provision of the protuberance, thereby permitting the sound tube to have a cross sectional area free of abrupt changes and ensuring a uniform variation of acoustic impedance when the sound waves radiated from the speaker pass through the sound tube.
  • FIG. 20 shows an F-type speaker device which has a pair of reflectors on the front side of a sound absorbing material in the interior of the sound tube.
  • FIG. 21 shows the frequency characteristics of the device determined.
  • the dip in the range of 6000 Hz to 7000 Hz is made lesser than in the case of the E-type device (broken line). This reveals that the sound pressure is adjustable in the range of high frequencies by the provision of the reflectors
  • the speaker 3 is attached to the sound tube 4 at an intermediate portion thereof, preferably at a position spaced apart from the closed end by a distance corresponding to about 1/5 to about 3/5, more preferably 1/3, of the entire length of the tube 4, whereby peak dips occurring in the sound pressure-frequency characteristics of the speaker device can be effectively diminished as described above.
  • the sound tube is packed with the sound absorbing material 5, formed with the protuberance 6 and provided with the reflector 7, improved frequency characteristics are made available over the range of medium to high frequencies.
  • the provision of the terminals 32, 32 of the speaker 3 as shifted from the closed end side of the sound tube 4 to the open end side thereof obviates the imbalance of the resistance to be loaded when the diaphragm 31 vibrates, affording a distortion-free high sound quality.
  • the tube Since the forward wave guide channel 43 of the sound tube 4 is given a constant cross sectional area as the tube extends forward, the tube is constant in acoustic impedance from the position of attachment of the speaker 3 to the open end and unlikely to permit occurrence of reflected waves at an intermediate portion of the forward wave guide channel 43 and to function as a so-called Helmholtz resonator.
  • a pair of opposite speaker devices 2, 2 can be compactly arranged inside the cabinet 1 effectively utilizing dead spaces created at opposite sides of the cathode-ray tube 11. Speakers 3 of increased diameter are therefore readily usable.
  • the forward wave guide channel 43 of the sound tube 4 is designed to have a constant cross sectional area toward the open end according to the embodiments, whereas the forward wave guide channel 43 can be enlarged toward the open end to obtain a horn effect.
  • the device of the invention has the basic feature that the speaker 3 is attached to an intermediate portion of the sound tube 4, the device is also packed with the sound absorbing material 5, formed with the protuberance 6 and provided with the reflectors 7 and with the speaker terminals 32, 32 in an altered position as additional features.
  • all of these additional means need not be provided, but one or some of these means as optionally selected can be added to the device.

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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)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP96108264A 1995-05-26 1996-05-23 Loudspeaker device and television receiver using the device Withdrawn EP0744880A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP152560/95 1995-05-26
JP15256095A JP3171542B2 (ja) 1995-05-26 1995-05-26 スピーカ装置及びこれを用いたテレビジョン受像機

Publications (1)

Publication Number Publication Date
EP0744880A1 true EP0744880A1 (en) 1996-11-27

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Family Applications (1)

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EP96108264A Withdrawn EP0744880A1 (en) 1995-05-26 1996-05-23 Loudspeaker device and television receiver using the device

Country Status (4)

Country Link
EP (1) EP0744880A1 (zh)
JP (1) JP3171542B2 (zh)
KR (1) KR100221987B1 (zh)
CN (1) CN1054490C (zh)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221823A2 (en) 2001-01-02 2002-07-10 Bose Corporation Electroacoustic waveguide transducing
EP2648421A4 (en) * 2010-12-03 2015-05-13 Panasonic Ip Man Co Ltd SPEAKER SYSTEM
US9107003B2 (en) 2011-12-15 2015-08-11 Apple Inc. Extended duct with damping for improved speaker performance
US9363586B2 (en) 2001-02-09 2016-06-07 Thx Ltd. Narrow profile speaker configurations and systems
WO2018193154A1 (en) * 2017-04-21 2018-10-25 Genelec Oy Directive multiway loudspeaker with a waveguide
US10299032B2 (en) 2017-09-11 2019-05-21 Apple Inc. Front port resonator for a speaker assembly
US11451902B1 (en) 2021-05-07 2022-09-20 Apple Inc. Speaker with vented resonator
EP4009657A4 (en) * 2019-09-20 2022-10-12 Guangzhou Shiyuan Electronics Co., Ltd. ELECTRONIC DEVICE
US11490190B1 (en) 2021-05-07 2022-11-01 Apple Inc. Speaker with multiple resonators
WO2022246012A1 (en) * 2021-05-21 2022-11-24 Meta Platforms Technologies, Llc Dual dipole sound sources configuration to mitigate leakage

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JP3732007B2 (ja) * 1998-04-30 2006-01-05 ティーオーエー株式会社 ホーンスピーカ
CN1437427B (zh) * 2002-02-08 2012-12-26 石丰山 一种扬声器系统
JP2006237826A (ja) * 2005-02-23 2006-09-07 Pioneer Electronic Corp 平面表示機器用スピーカ装置及び平面表示装置
JP2008085528A (ja) * 2006-09-27 2008-04-10 Onkyo Corp 動電型スピーカーおよびスピーカーシステム
US8002078B2 (en) * 2009-02-19 2011-08-23 Bose Corporation Acoustic waveguide vibration damping
JP2011029897A (ja) * 2009-07-24 2011-02-10 Sharp Corp スピーカユニット及び表示装置
CN103597853A (zh) * 2011-04-28 2014-02-19 普罗米修斯有限责任公司 手持式电子设备和/或用于手持式电子设备的盖
US9154869B2 (en) * 2012-01-04 2015-10-06 Apple Inc. Speaker with a large volume chamber and a smaller volume chamber
JP2013246351A (ja) * 2012-05-28 2013-12-09 Denso Corp 車両存在通報装置
JP2014035640A (ja) * 2012-08-08 2014-02-24 Toshiba Corp 電子機器、音質改善方法および音質改善部材
CN104113797A (zh) * 2014-06-26 2014-10-22 小米科技有限责任公司 音频组件及电子设备
JP6597617B2 (ja) * 2014-08-05 2019-10-30 ソニー株式会社 表示装置
CN106162458A (zh) * 2016-07-19 2016-11-23 南京大学 一种扬声器声传导腔体装置
DE102018103272A1 (de) * 2017-11-28 2019-05-29 Riedel Communications International GmbH Sprechstelle für ein Intercom-Netzwerk
WO2023238256A1 (ja) * 2022-06-07 2023-12-14 バルミューダ株式会社 表示装置
CN115278443A (zh) * 2022-07-06 2022-11-01 美特科技(苏州)有限公司 一种扬声器

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GB735402A (en) * 1953-07-23 1955-08-17 Gen Electric Co Ltd Improvements in or relating to television receivers
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GB735402A (en) * 1953-07-23 1955-08-17 Gen Electric Co Ltd Improvements in or relating to television receivers
US3993162A (en) * 1975-06-20 1976-11-23 Kenneth Juuti Acoustic speaker system
EP0390165A2 (en) * 1989-03-29 1990-10-03 SANYO ELECTRIC Co., Ltd. Speaker system
EP0451885A1 (en) * 1990-03-13 1991-10-16 Koninklijke Philips Electronics N.V. Audio or video apparatus with in-built loud-speaker
EP0451991A2 (en) * 1990-03-30 1991-10-16 Matsushita Electric Industrial Co., Ltd. Speaker system and TV with the same
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221823A2 (en) 2001-01-02 2002-07-10 Bose Corporation Electroacoustic waveguide transducing
EP1221823A3 (en) * 2001-01-02 2004-11-17 Bose Corporation Electroacoustic waveguide transducing
US7426280B2 (en) 2001-01-02 2008-09-16 Bose Corporation Electroacoustic waveguide transducing
CN1387386B (zh) * 2001-01-02 2010-05-05 伯斯有限公司 电声波导系统以及操作声音波导管的方法
US8175311B2 (en) 2001-01-02 2012-05-08 Aylward J Richard Electroacoustic waveguide transducing
US9866933B2 (en) 2001-02-09 2018-01-09 Slot Speaker Technologies, Inc. Narrow profile speaker configurations and systems
US9363586B2 (en) 2001-02-09 2016-06-07 Thx Ltd. Narrow profile speaker configurations and systems
EP2648421A4 (en) * 2010-12-03 2015-05-13 Panasonic Ip Man Co Ltd SPEAKER SYSTEM
US9107003B2 (en) 2011-12-15 2015-08-11 Apple Inc. Extended duct with damping for improved speaker performance
US11026017B2 (en) 2017-04-21 2021-06-01 Genelec Oy Directive multiway loudspeaker with a waveguide
RU2738914C1 (ru) * 2017-04-21 2020-12-18 Генелек Ой Направленный многоканальный громкоговоритель с волноводом
WO2018193154A1 (en) * 2017-04-21 2018-10-25 Genelec Oy Directive multiway loudspeaker with a waveguide
US10299032B2 (en) 2017-09-11 2019-05-21 Apple Inc. Front port resonator for a speaker assembly
EP4009657A4 (en) * 2019-09-20 2022-10-12 Guangzhou Shiyuan Electronics Co., Ltd. ELECTRONIC DEVICE
JP2022547321A (ja) * 2019-09-20 2022-11-11 広州視源電子科技股▲分▼有限公司 電子機器
US11910157B2 (en) 2019-09-20 2024-02-20 Guangzhou Shiyuan Electronic Technology Company Limited Electronic apparatus
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
WO2022246012A1 (en) * 2021-05-21 2022-11-24 Meta Platforms Technologies, Llc Dual dipole sound sources configuration to mitigate leakage

Also Published As

Publication number Publication date
JP3171542B2 (ja) 2001-05-28
CN1140970A (zh) 1997-01-22
KR960043966A (ko) 1996-12-23
CN1054490C (zh) 2000-07-12
JPH08331685A (ja) 1996-12-13
KR100221987B1 (ko) 1999-09-15

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