EP3611934A1 - Système audio portable avec guide d'ondes acoustique - Google Patents

Système audio portable avec guide d'ondes acoustique Download PDF

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Publication number
EP3611934A1
EP3611934A1 EP18189089.8A EP18189089A EP3611934A1 EP 3611934 A1 EP3611934 A1 EP 3611934A1 EP 18189089 A EP18189089 A EP 18189089A EP 3611934 A1 EP3611934 A1 EP 3611934A1
Authority
EP
European Patent Office
Prior art keywords
audio system
woofer
tweeter
main surface
waveguide
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Withdrawn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
EP18189089.8A
Other languages
German (de)
English (en)
Inventor
Kai-Li Wang
James Thomson
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.)
Tymphany Hong Kong Ltd
Original Assignee
Tymphany Hong Kong 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 Tymphany Hong Kong Ltd filed Critical Tymphany Hong Kong Ltd
Priority to EP18189089.8A priority Critical patent/EP3611934A1/fr
Publication of EP3611934A1 publication Critical patent/EP3611934A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/20—Reflecting arrangements
    • 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 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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
    • H04R1/345—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 for loudspeakers
    • 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
    • H04R2201/34—Directing or guiding sound by means of a phase plug

Definitions

  • the present invention relates to an audio system and more particularly to an audio system including an acoustic diffuser, for example an acoustic waveguide, between the drivers of the audio system.
  • an acoustic diffuser for example an acoustic waveguide
  • Drivers are transducers that generate various ranges of sound frequencies. Audio systems with speakers are known to include a plurality of drivers that are configured to generate sounds of varying frequencies. Audio systems often use multiple drivers to enhance sound quality. For example, audio systems often will use tweeters for producing sound in a high-frequency range, woofers for producing sound in a low frequency range and midrange drivers for producing sound in midrange frequencies. Providing such combinations of multiple drivers can advantageously cover all ranges of audible sound. Typically, the drivers are mounted coaxially. Such speakers are commonly referred to as omnidirectional speakers.
  • U.S. Patent No. 8,130,994 is directed to a speaker with two drivers.
  • the speaker includes a woofer and tweeter that are coaxially aligned and project sound toward a same direction.
  • the speaker also includes a waveguide that works as a low pass filter for facilitating low frequencies.
  • U.S. 9,549,237 is directed to a speaker having two drivers, each having a waveguide.
  • the two drivers include a woofer and tweeter coaxially aligned and disposed apart from one another.
  • a problem with such speakers is that it is difficult to reduce the size of the audio system/speaker. Additionally, using, for example, a woofer in combination with a tweeter can result in intermodulation distortion.
  • an exemplary feature of the present invention is to provide a speaker/audio system with improved omnidirectional sound quality.
  • the invention relates to an audio system, comprising two loudspeaker drivers having different diaphragm dimensions and configured for different frequency bands.
  • the two loudspeaker drivers are disposed coaxially and facing each other in a common acoustic cavity.
  • An acoustic diffuser is disposed between the two loudspeaker drivers in the common acoustic cavity.
  • the acoustic diffuser has two main surfaces, each facing a respective one of the two loudspeaker drivers and the two main surfaces being coaxial with the two loudspeaker drivers.
  • the two main surfaces have different shapes.
  • an omnidirectional speaker/audio system with improved sound directivity (i.e., more even from different angles). Furthermore, the speaker/audio system is able to provide a flatter frequency response. Finally, the speaker/audio system is able to reduce or eliminate intermodulation distortion as a result of the drivers (e.g., tweeter and woofer) acoustically interacting with each other.
  • the drivers e.g., tweeter and woofer
  • the two loudspeaker drivers comprise a woofer configured for a lower frequency band of said different frequency bands, and a tweeter configured for an upper frequency band of said different frequency bands.
  • the audio system includes only one acoustic diffuser.
  • the diameter of the acoustic diffuser preferably corresponds to the diameter of the diaphragm of one of the two loudspeaker drivers or any diameter between them.
  • the tweeter is recessed in a cavity by a recess wall within the common acoustic cavity, the recess wall preferably being smoothly rounded.
  • the acoustic diffuser comprises a waveguide, and wherein the first main surface and the second main surface are preferably smoothly connected to each other.
  • the diameter of the circumference of the acoustic diffuser preferably does not exceed in size a diameter of a diaphragm of the woofer.
  • the acoustic diffuser is mounted within the audio system by a plurality of mechanical elements, which are preferably substantially acoustically transparent.
  • the first main surface is preferably convex facing the woofer, and the second main surface facing the tweeter is preferably bell-shaped.
  • the shape of a diaphragm cone of the woofer substantially corresponds to the shape of the first main surface, and/or the first main surface is substantially parallel to a diaphragm cone of the woofer.
  • the first main surface and the second main surface have different shapes.
  • the present invention further relates to a portable audio system, comprising the audio system according to any of the above; and a housing defining the common acoustic cavity.
  • a first of the two loudspeaker drivers is a woofer disposed at a first end of the housing in the common acoustic cavity and a second of the two loudspeaker drivers is a tweeter disposed at a second end of the housing, opposite to the first end, in the common acoustic cavity facing the woofer.
  • FIG. 1 illustrates an audio system 100, for example a compact speaker, for example a portable speaker such as a Bluetooth speaker, or a compact satellite speaker for a home theater setup, in accordance with an exemplary, non-limiting embodiment of the present invention.
  • the speaker 100 has an outer housing 110 defining an acoustic cavity 112.
  • the acoustic cavity 112 is a common acoustic cavity in that all components of the speaker 100 are disposed within a same acoustic cavity.
  • the speaker 100 includes a pair of loudspeaker drivers. Specifically, the speaker 100 includes a tweeter 130 and a woofer 120. Besides their exemplary diaphragms 122 and 132, only the circumferences of the drivers are illustrated in dashed lines to indicate the numerous various possible configuration of loudspeaker drivers as appreciated by the person skilled in loudspeaker driver design.
  • the tweeter 130 and the woofer 120 are optimized to be efficient, reproducing different frequencies. That is, the tweeter 130 and the woofer 120 are configured to reproduce different frequency bands.
  • the woofer 120 and the tweeter 130 are preferably able to generate sound over a range from low bass at 20 - 80 Hz to high treble at 15,000 - 20,000 Hz, ideally from 20 Hz to 20,000 Hz.
  • the woofer 120 is optimized for generation of sound in the lower band up to a crossover frequency, and the tweeter 130 optimized for the higher band from the crossover frequency and up.
  • the crossover frequency is selected in accordance with the specific drivers, the intended usage, etc., as the skilled person is well aware.
  • the crossover frequency may for example be selected between 350 Hz and 5,000 Hz, for example at 2,000 Hz, whereby for example the tweeter 130 is a high frequency driver that may generate sound over a range of 2,000 Hz to 20,000 Hz, and the woofer 120 is a low frequency driver that may generate sound over a range of 40 Hz to 2,000 Hz.
  • the tweeter 130 is ranged from 500 Hz to 20,000 Hz
  • the woofer 120 is ranged from 40 Hz to 500 Hz.
  • the speaker 100 preferably comprises a suitable crossover filter, splitting the input audio signal into the two frequency bands suitable for the woofer 120 and tweeter 130, respectively.
  • the speaker 100 is optimized for use together with an external woofer, subwoofer or other bass driver, and the woofer 120 may then for example be a mid-range driver ranged from, e.g., 300 Hz to 3,000 Hz, and the tweeter 130 from, e.g., 3,000 Hz to 20,000 Hz.
  • the woofer 120 is a mid-range driver
  • a low bass woofer may be mounted in either end of the speaker 100 with a separate waveguide or no waveguide.
  • one of the drivers is much larger than the other driver; in this specific example the dimensions, in particular the diaphragm 122 dimensions, of woofer 120, are significantly larger than the dimensions, in particular the diaphragm 132 dimensions, of tweeter 130.
  • the driver configured for the lower frequency band will typically be larger than the driver configured for the higher frequency band, in particular with regards to the diaphragm diameter.
  • the woofer 120 and tweeter 130 are configured to radiate sound within the speaker 100. Moreover, the woofer 120 and the tweeter 130 are mounted coaxially with respect to each other. That is, a center of the tweeter 130 and a center of the woofer 120 are aligned over a common vertical axis 116. The two drivers 120 and 130 are facing each other along the axis 116; that is, their diaphragms 122 and 132 are facing each other.
  • the speaker 100 also includes an acoustic diffuser 140 in the form of a waveguide positioned in the common acoustic cavity 112 between the woofer 120 and the tweeter 130.
  • the waveguide 140 is positioned coaxially with the drivers 120 and 130 along axis 116.
  • the dimension of the waveguide is preferably approaching the dimensions of the woofer 120, i.e. the dimensions of the diaphragms of the woofer 120, thereby preferably significantly larger than the dimensions of the tweeter 130.
  • the speaker 100 includes only a single waveguide 140 common for the woofer 120 and the tweeter 130. That is, in accordance with the present invention, it is not required to provide separate waveguides for the individual drivers.
  • the waveguide 140 is an acoustic diffuser that is configured to disperse and distribute the sound waves from the woofer 120 and the tweeter 130 so that the speaker 100 provides an omnidirectional radiation pattern at least along one axis. This is achieved by two waveguide surfaces 142 and 143.
  • the waveguide 140 eliminates the intermodulation distortion as a result of both transducers acoustically interacting with each other, specifically at above approx. 8kHz.
  • Fig. 2 illustrates the coaxial configuration of the radiation surface 122 of the woofer 120, the radiation surface 132 of the tweeter 130 and the waveguide 140 along the common axis 116.
  • one of the drivers is larger than the other, and the diameter of the waveguide is in the range between the two drivers, possibly the same diameter as one of the drivers.
  • the woofer radiation face 122 is the largest diameter
  • the tweeter radiation face 132 is the smallest diameter
  • the waveguide 140 is between the two driver diameters, closer to the largest diameter.
  • Fig. 3 illustrates an embodiment of an audio system of the invention in more detail.
  • the woofer 120 and tweeter 130 are held within the housing 110 by a frame 150.
  • the frame 150 has a first frame portion 152 holding the woofer 120 and a second frame portion 154 holding the tweeter 130.
  • the first frame portion 152 and the second frame portion 154 are connected by frame columns 156.
  • the first frame portion 152 has a bottom portion 152a.
  • the woofer 120 is secured to the bottom portion 152a.
  • the second frame portion 154 has a top portion 154a.
  • the tweeter 130 is secured to the top portion 154a.
  • the woofer 120 and the tweeter 130 are mounted such that they face each other. Furthermore, the woofer 120 and tweeter 130 are contained together in the common acoustic cavity 112.
  • the first portion 152 of the frame 150 forms an acoustic cavity 153, within the common acoustic cavity 112, for the woofer 120.
  • the diaphragm cone 122 of the woofer has a shape that substantially matches the shape of the first main surface 142 of the waveguide 140.
  • the diaphragm cone 122 and the first main surface 142 are disposed substantially in parallel.
  • the second portion 154 of the frame 150 forms another acoustic cavity 155 for the tweeter 132 within the common acoustic cavity 112.
  • the tweeter 130 is recessed into the acoustic cavity 155 so that the recess wall 158 around the tweeter 130 acts as a primary tweeter waveguide.
  • the recess wall 158 is preferably smoothly rounded.
  • the waveguide 140 is in this particular embodiment mounted to the bottom portion 152a of the first portion 152 of the frame 150.
  • the waveguide 140 is mounted by mechanical elements 146.
  • the mechanical elements 146 are configured to hold the waveguide 140 in place and to not significantly modify the sound waves generated by the drivers.
  • the mechanical elements 146 are configured to be as acoustically transparent as possible.
  • FIG. 140 Various other configurations of mounting the waveguide 140 between the woofer 120 and tweeter 130 are within the scope of the invention, for example reversing the mechanical elements 146 upside down so that the waveguide 140 can be mounted to the top portion 154a of the second portion 154 of the frame 150, or for example mounting the waveguide 140 to the frame columns 156 by means of suitable mechanical elements.
  • the outer housing 110 comprises a slit, grille, mesh or other kind of acoustic openings 114 to allow sound generated by the included drivers, e.g. the woofer 120 and tweeter 130, to escape from the speaker 100.
  • the acoustic openings 114 may in various embodiments cover more or less of the surface of the outer housing 110, but are preferably at least located in the general area of the waveguide 140 and the radiation surfaces of the two drivers, for example as illustrated in Fig. 3 or Fig. 10 , so as to correspond to the primary radiation directions of sound waves from the waveguide 140.
  • the outer housing 110 preferably forms additional space, e.g. as illustrate in Fig. 3 , for housing electronics, such as a cross-over filter and input terminals for a passive speaker system, and in addition for an active speaker system, a power supply and an amplifier.
  • the power supply may be batteries, an AC-DC adapter or simply an input for an external power supply, e.g. a USB charger or an AC-DC adapter.
  • the electronics may also comprise an equalizer allowing optimization for the specific audio system configuration.
  • a user interface comprising buttons and/or a display may also be provided in the housing.
  • the audio system may further comprise wireless connectivity, e.g. for receiving audio signals and/or control signals via Bluetooth, WIFI, etc.
  • the electronics such as cross-over filter and a possible equalizer, may for example be implemented by discrete electronic components and/or by means of a generic microprocessor or dedicated integrated circuits.
  • the waveguide 140 is illustrated in further detail in Figs. 4 - 7 .
  • the waveguide 140 includes a first main surface 142 and a second main surface 143.
  • the two main surfaces 142, 143 are smoothly connected to one another.
  • the waveguide is a monolithic piece comprising both main surfaces 142, 143.
  • the monolithic waveguide in the embodiment of Fig. 5 is illustrated as a solid part, but may also be hollow.
  • the waveguide 140 may preferably include, for example, four mechanical elements 146 for connection to a frame portion, e.g. as described below.
  • Fig. 7 illustrates an embodiment of a waveguide 140.
  • the first main surface 142 and the second main surface 143 are held by a frame portion 144 with mechanical elements 146.
  • the mechanical elements 146 may be mounted on a frame, e.g. first frame portion 152 or second frame portion 154 of frame 150.
  • the mechanical elements 146 may be mounted direction to frame 150 or frame columns 156, or be mounted by means of a mounting ring, such as the mounting ring 148 shown in Fig. 7 .
  • the first main surface 142 and the second main surface 143 respectively face the woofer 120 and the tweeter 130.
  • the two main surfaces 142, 143 of the waveguide 140 do not present steep geometries. Instead, the main surfaces are smooth so that air turbulences are minimized. Furthermore, both of the main surfaces 142, 143 are asymmetric presenting different geometries. That is, the main surface that faces the largest of the drivers has a convex geometry while the main surface that faces the smallest of the drivers has a very smooth cone or bell-like geometry.
  • the woofer 120 is larger than the tweeter 130.
  • the first main surface 142 faces the woofer 120 and has a convex geometry toward the woofer 120.
  • the second main surface 143 faces the tweeter 130 and has a very smooth cone or bell-like geometry.
  • the diameter of the waveguide 140 is configured to not exceed the diameter of the radiation surface of the larger of the two drivers/loudspeakers.
  • the woofer 120 is larger than the tweeter 130.
  • the diameter of the waveguide 140 is configured to not exceed, in size, the diameter of the radiation surface of the woofer 120.
  • Figs. 8 - 9 illustrate perspective views of the assembled drivers, waveguide and frame according to embodiments of the present invention.
  • the speaker 100 comprises a frame 150 with first frame portion 152 and second frame portion 154 connected by frame columns 156.
  • the woofer diaphragm 122 of woofer 120 mounted to the bottom portion 152a of first frame portion 152, together with the mechanical parts 146 mounting the waveguide 140 to the bottom portion 152a.
  • the second main surface 143 of the waveguide 140 is seen.
  • the tweeter diaphragm 132 of tweeter 130 recessed by recess wall 158 in the top portion 154a of second frame portion 154.
  • the first main surface 142 of the waveguide 140 is seen.
  • Fig. 10 illustrates a perspective view of a part of audio system 100 according to an embodiment of the invention.
  • An outer housing 110 comprises acoustic openings 114, through which can be seen the waveguide 140 with first main surface 142 opposite the woofer diaphragm 122, and second main surface 143 opposite the tweeter diaphragm 132 slightly visible within the recess wall 158. Acoustic waves generated by the diaphragms of the woofer and tweeter are directed through the acoustic openings by means of the waveguide in order to form an omnidirectional two-way speaker.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP18189089.8A 2018-08-15 2018-08-15 Système audio portable avec guide d'ondes acoustique Withdrawn EP3611934A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18189089.8A EP3611934A1 (fr) 2018-08-15 2018-08-15 Système audio portable avec guide d'ondes acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18189089.8A EP3611934A1 (fr) 2018-08-15 2018-08-15 Système audio portable avec guide d'ondes acoustique

Publications (1)

Publication Number Publication Date
EP3611934A1 true EP3611934A1 (fr) 2020-02-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114554366A (zh) * 2020-11-26 2022-05-27 宁波升亚电子有限公司 音效装置及其制造方法和发声方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007103A1 (fr) * 1988-12-14 1990-06-28 Ralph William Oakley Unite de reflexion acoustique et enceinte acoustique pourvue de ce reflecteur
US6064744A (en) * 1997-04-18 2000-05-16 Augustin; Heinz-Juergen Omni-directional loudspeaker
US8130994B2 (en) 2008-06-17 2012-03-06 Harman International Industries, Incorporated Waveguide
US9549237B2 (en) 2014-04-30 2017-01-17 Samsung Electronics Co., Ltd. Ring radiator compression driver features
US9641919B1 (en) * 2014-09-30 2017-05-02 Amazon Technologies, Inc. Audio assemblies for electronic devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007103A1 (fr) * 1988-12-14 1990-06-28 Ralph William Oakley Unite de reflexion acoustique et enceinte acoustique pourvue de ce reflecteur
US6064744A (en) * 1997-04-18 2000-05-16 Augustin; Heinz-Juergen Omni-directional loudspeaker
US8130994B2 (en) 2008-06-17 2012-03-06 Harman International Industries, Incorporated Waveguide
US9549237B2 (en) 2014-04-30 2017-01-17 Samsung Electronics Co., Ltd. Ring radiator compression driver features
US9641919B1 (en) * 2014-09-30 2017-05-02 Amazon Technologies, Inc. Audio assemblies for electronic devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114554366A (zh) * 2020-11-26 2022-05-27 宁波升亚电子有限公司 音效装置及其制造方法和发声方法
CN114554366B (zh) * 2020-11-26 2023-12-19 宁波升亚电子有限公司 音效装置及其制造方法和发声方法

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