CN118382045A - Loudspeaker - Google Patents
Loudspeaker Download PDFInfo
- Publication number
- CN118382045A CN118382045A CN202410798085.6A CN202410798085A CN118382045A CN 118382045 A CN118382045 A CN 118382045A CN 202410798085 A CN202410798085 A CN 202410798085A CN 118382045 A CN118382045 A CN 118382045A
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- CN
- China
- Prior art keywords
- displacement
- ultrasonic
- loudspeaker
- bottom ultrasonic
- helmholtz
- 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.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 72
- 239000000463 material Substances 0.000 claims description 5
- 238000002604 ultrasonography Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101000685982 Homo sapiens NAD(+) hydrolase SARM1 Proteins 0.000 description 1
- 102100023356 NAD(+) hydrolase SARM1 Human genes 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 239000000849 selective androgen receptor modulator Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention relates to the field of electroacoustic conversion, in particular to a loudspeaker. Compared with the prior art, the loudspeaker comprises one or more ultrasonic units which are connected with each other, wherein the ultrasonic unit comprises a bottom ultrasonic device and a plurality of displacement components which are fixed on the bottom ultrasonic device and are distributed along the periphery of the bottom ultrasonic device, and the plurality of displacement components and the bottom ultrasonic device jointly enclose an acoustic channel which is communicated with the outside; the displacement component comprises a displacement device fixed on the bottom ultrasonic device and a resonance device fixed on one side of the displacement device far away from the bottom ultrasonic device, and at least one Helmholtz resonance cavity communicated with the sound outlet channel is arranged on the resonance device; the displacement device vibrates to drive the resonance device to resonate, so that the volume of the Helmholtz resonant cavity changes; ultrasonic signals sent by the bottom ultrasonic device are demodulated in the Helmholtz resonant cavity to form low-frequency signals, and the low-frequency signals are transmitted to the outside through the sounding channel. The size of the loudspeaker is smaller, and the electroacoustic conversion efficiency is high.
Description
Technical Field
The invention relates to the field of electroacoustic conversion, in particular to a loudspeaker.
Background
The speaker includes various types, and the directional speaker is a type based on a parametric array principle, which modulates an audio signal onto an ultrasonic carrier wave, and generates an audible sound with high directivity through a self-solution process under a nonlinear effect.
The loudspeaker in the prior art has low electroacoustic conversion efficiency and large size, an ultrasonic device cannot directly generate audible sound, a specific modulation signal is needed, the audible sound is obtained by demodulation through nonlinearity of the ultrasonic wave when the ultrasonic wave propagates in the air, and meanwhile, due to low demodulation efficiency, the module of the loudspeaker has large size and cannot be applied to an electronic portable mobile terminal.
Therefore, there is a need to provide a new speaker to solve the above technical problems.
Disclosure of Invention
The invention provides a loudspeaker, and aims to provide a loudspeaker for realizing ultrasonic demodulation by utilizing a Helmholtz resonant cavity, which has small size and high conversion efficiency.
In order to achieve the above object, the present invention provides a speaker, which includes one or more interconnected ultrasonic units, the ultrasonic units including a bottom ultrasonic device and a plurality of displacement assemblies fixed to the bottom ultrasonic device and arranged along a periphery of the bottom ultrasonic device, the plurality of displacement assemblies and the bottom ultrasonic device enclosing together an acoustic channel communicating with the outside;
The displacement assembly comprises a displacement device fixed on the bottom ultrasonic device and a resonance device fixed on one side of the displacement device away from the bottom ultrasonic device, and at least one Helmholtz resonant cavity communicated with the sound outlet channel is arranged on the resonance device; the displacement device vibrates to drive the resonance device to resonate, so that the volume of the Helmholtz resonant cavity changes; and the ultrasonic signals sent by the bottom ultrasonic device are demodulated in the Helmholtz resonant cavity to form low-frequency signals, and the low-frequency signals are transmitted to the outside through the sounding channel.
Preferably, the resonance frequency of the displacement device is the same as the resonance frequency of the air in the helmholtz resonator.
Preferably, the resonant frequency of the displacement device is the same as the resonant frequency of the bottom ultrasound device.
Preferably, the displacement device is made of piezoelectric material.
Preferably, the carrier frequency of the ultrasonic signal emitted by the bottom ultrasonic device is greater than or equal to 100kHz.
Preferably, the bottom ultrasound device is rectangular; the displacement assembly comprises four and is respectively arranged along four sides of the bottom ultrasonic device.
Preferably, each displacement device is provided with three helmholtz resonance cavities arranged at intervals, and the three helmholtz resonance cavities are arranged at intervals along the sound outlet direction of the sound outlet channel.
Preferably, the bottom ultrasonic device comprises a device body and a boss formed by extending the device body towards the sound outlet channel, and the displacement device is fixed on the boss.
Preferably, the boss includes a boss body, a groove formed by recessing the boss body away from the sound emitting channel, and the displacement device is fixed to the boss body.
Compared with the prior art, the loudspeaker comprises one or more ultrasonic units which are connected with each other, wherein the ultrasonic unit comprises a bottom ultrasonic device and a plurality of displacement components which are fixed on the bottom ultrasonic device and are distributed along the periphery of the bottom ultrasonic device, and the plurality of displacement components and the bottom ultrasonic device jointly enclose an acoustic channel which is communicated with the outside; the displacement component comprises a displacement device fixed on the bottom ultrasonic device and a resonance device fixed on one side of the displacement device far away from the bottom ultrasonic device, and at least one Helmholtz resonance cavity communicated with the sound outlet channel is arranged on the resonance device; the displacement device vibrates to drive the resonance device to resonate, so that the volume of the Helmholtz resonant cavity changes; ultrasonic signals sent by the bottom ultrasonic device are demodulated in the Helmholtz resonant cavity to form low-frequency signals, and the low-frequency signals are transmitted to the outside through the sounding channel. The size of the loudspeaker is smaller, and the electroacoustic conversion efficiency is high.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
fig. 1 is a schematic perspective view of a speaker according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of an ultrasonic unit of a speaker according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of an ultrasonic unit structure of a speaker according to an embodiment of the present invention;
Fig. 4 is a cross-sectional view taken along line A-A of fig. 2.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a speaker 100, where the speaker 100 includes one or more interconnected ultrasonic units 10, and the ultrasonic unit 10 includes a bottom ultrasonic device 1 and a plurality of displacement assemblies 2 fixed to the bottom ultrasonic device 1 and arranged along a periphery of the bottom ultrasonic device 1, and the plurality of displacement assemblies 2 and the bottom ultrasonic device 1 together enclose an acoustic output channel 3 communicating with the outside.
The displacement assembly 2 comprises a displacement device 21 fixed on the bottom ultrasonic device 1 and a resonance device 22 fixed on one side of the displacement device 21 away from the bottom ultrasonic device 1, wherein the resonance device 22 is provided with at least one Helmholtz resonant cavity 23 communicated with the sound outlet channel 3; the displacement device 21 vibrates to drive the resonance device 22 to resonate, so that the volume of the Helmholtz resonant cavity 23 changes; the ultrasonic signal emitted by the bottom ultrasonic device 1 is demodulated in the helmholtz resonant cavity 23 to form a low-frequency signal, and the low-frequency signal is transmitted to the outside through the sound emitting channel 3.
An excitation signal is applied to the displacement device 21 to drive the displacement device 21 to vibrate, so that the resonance device 22 is excited by harmonic force, and the resonance device 22 is affected by the harmonic force excitation to resonate to generate shrinkage, so that the helmholtz resonance cavity 23 is caused to change in volume. Wherein the closer the resonance device 22 is to the displacement device 21, the larger the displacement is.
Further, since the helmholtz resonator 23 undergoes a volume change, the air in the helmholtz resonator 23 also vibrates at the same resonance frequency as the resonance device 22. Accordingly, the ultrasonic signal emitted by the bottom ultrasonic device 11 transmitted to the displacement device 21 is demodulated into a low-frequency signal in the helmholtz resonator 23 and then transmitted to the outside through the sound outlet channel 3. Specifically, by adjusting the size of the cavity of the helmholtz resonant cavity 23, harmonic changes of the sound pressure amplitude of the ultrasonic signal, that is, increase or decrease of the sound pressure amplitude, are caused, so that the low-frequency information contained in the ultrasonic signal is demodulated to form the low-frequency signal.
In the present embodiment, the resonance frequency of the displacement device 21 is equal to the resonance frequency of the bottom ultrasonic device 1.
Specifically, the ultrasonic signal is an ultrasonic modulation signal, and optionally, the ultrasonic signal sent by the bottom ultrasonic device 1 may be obtained by multiple modulation methods, for example DSB（Double Sideband Signal）/DSB-SC（Double Sideband with Suppressed Carrier）/SARM/SSB（Single Sideband Signal）. And the excitation signal driving the displacement device 21 is an ultrasonic single-frequency signal with the same frequency as the ultrasonic signal, and the displacement device 21 is driven by the ultrasonic single-frequency signal to generate vibration. As described above, the resonance frequency of the air in the helmholtz resonant cavity 23 is the same as the resonance frequency of the displacement device 21, and according to the modulation and demodulation mechanism of the signals, the ultrasonic modulation signal sent by the bottom ultrasonic device 1 is multiplied by the ultrasonic single-frequency signal, so that the low-frequency information in the ultrasonic signal sent by the bottom ultrasonic device 1 can be demodulated, and finally the low-frequency signal transmitted to the outside through the sound output channel 3 can be obtained, and the low-frequency signal can be acquired by human ears.
Specifically, the resonance frequency of the air in the helmholtz resonator 23 may be adjusted according to the actual situation, and the size of the helmholtz resonator 23 may also be set according to the actual situation requirement, so long as the sound pressure amplitude of the ultrasonic signal sent by the bottom ultrasonic device 1 may be caused to change for demodulation. In other embodiments, the resonant frequency of the displacement device 21 and the resonant frequency of the bottom ultrasonic device 1 are not necessarily equal, but may be similar.
In the present embodiment, the displacement device 21 is made of a piezoelectric material. When receiving the excitation signal to the displacement device 21, the displacement device vibrates along the extending direction of the sound emitting channel 3 to generate displacement, so as to drive the resonance device 22 to resonate. It will be appreciated that in other embodiments, the displacement device 21 may be other devices that can vibrate to produce displacement.
In this embodiment, the carrier frequency of the ultrasonic signal emitted by the bottom ultrasonic device 1 is greater than or equal to 100kHz, and the bottom ultrasonic device 1 may be a MEMS ultrasonic device, which may include a diaphragm made of a piezoelectric material, which may be the same as the piezoelectric material from which the displacement device 21 is made.
The bottom ultrasound device 1 may be rectangular, circular or other shape. As shown in fig. 2, in the present embodiment, the bottom ultrasonic device 1 is rectangular, the number of the displacement assemblies 2 is four, and the four displacement assemblies 2 are respectively disposed along four sides of the bottom ultrasonic device 1.
In this embodiment, each displacement device 21 is provided with three helmholtz resonator cavities 23 disposed at intervals, and the three helmholtz resonator cavities 23 are arranged at intervals along the sound emitting direction of the sound emitting channel 3, which should be noted that other numbers of helmholtz cavities are also possible, and may be set according to practical situations.
Specifically, the bottom ultrasonic device 1 includes a device body 11 and a boss 12 formed by extending the device body 11 toward the sound emitting channel 3, and the displacement device 21 is fixed to the boss 12. Specifically, the boss 12 includes a boss body 121 and a groove 122 formed by recessing the boss body 121 away from the sound outlet channel 33, and the displacement device 21 is fixed to the boss body 121. The recess 122 corresponds to the sound outlet channel 3.
Compared with the prior art, the loudspeaker comprises one or more ultrasonic units which are connected with each other, wherein the ultrasonic unit comprises a bottom ultrasonic device and a plurality of displacement components which are fixed on the bottom ultrasonic device and are distributed along the periphery of the bottom ultrasonic device, and the plurality of displacement components and the bottom ultrasonic device jointly enclose an acoustic channel which is communicated with the outside; the displacement component comprises a displacement device fixed on the bottom ultrasonic device and a resonance device fixed on one side of the displacement device far away from the bottom ultrasonic device, and at least one Helmholtz resonance cavity communicated with the sound outlet channel is arranged on the resonance device; the displacement device vibrates to drive the resonance device to resonate, so that the volume of the Helmholtz resonant cavity changes; ultrasonic signals sent by the bottom ultrasonic device are demodulated in the Helmholtz resonant cavity to form low-frequency signals, and the low-frequency signals are transmitted to the outside through the sounding channel. The size of the loudspeaker is smaller, and the electroacoustic conversion efficiency is high.
While the invention has been described with respect to the above embodiments, it should be noted that modifications can be made by those skilled in the art without departing from the inventive concept, and these are all within the scope of the invention.
Claims (9)
1. The loudspeaker is characterized by comprising one or more interconnected ultrasonic units, wherein each ultrasonic unit comprises a bottom ultrasonic device and a plurality of displacement components which are fixed on the bottom ultrasonic device and are distributed along the periphery of the bottom ultrasonic device, and a sound outlet channel communicated with the outside is formed by the plurality of displacement components and the bottom ultrasonic device;
The displacement assembly comprises a displacement device fixed on the bottom ultrasonic device and a resonance device fixed on one side of the displacement device away from the bottom ultrasonic device, and at least one Helmholtz resonant cavity communicated with the sound outlet channel is arranged on the resonance device; the displacement device vibrates to drive the resonance device to resonate, so that the volume of the Helmholtz resonant cavity changes; and the ultrasonic signals sent by the bottom ultrasonic device are demodulated in the Helmholtz resonant cavity to form low-frequency signals, and the low-frequency signals are transmitted to the outside through the sounding channel.
2. A loudspeaker according to claim 1, wherein the displacement device has a resonant frequency that is the same as the resonant frequency of air in the helmholtz resonator.
3. The loudspeaker of claim 1, wherein the resonant frequency of the displacement device is the same as the resonant frequency of the bottom ultrasound device.
4. A loudspeaker according to claim 1, wherein the displacement device is made of piezoelectric material.
5. The loudspeaker of claim 1, wherein the carrier frequency of the ultrasonic signal emitted by the bottom ultrasonic device is greater than or equal to 100kHz.
6. The loudspeaker of claim 1, wherein the bottom ultrasound device is rectangular; the displacement assembly comprises four and is respectively arranged along four sides of the bottom ultrasonic device.
7. A loudspeaker according to claim 1, wherein each displacement device is provided with three helmholtz resonators arranged at intervals, and the three helmholtz resonators are arranged at intervals along the sound outlet direction of the sound outlet channel.
8. The loudspeaker of claim 1, wherein the bottom ultrasonic device includes a device body and a boss formed by the device body extending in the direction of the sound outlet channel, the displacement device being secured to the boss.
9. The loudspeaker of claim 8, wherein the boss includes a boss body and a recess formed by the boss body being recessed away from the sound outlet channel, the displacement device being secured to the boss body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410798085.6A CN118382045B (en) | 2024-06-20 | 2024-06-20 | Loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410798085.6A CN118382045B (en) | 2024-06-20 | 2024-06-20 | Loudspeaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118382045A true CN118382045A (en) | 2024-07-23 |
| CN118382045B CN118382045B (en) | 2024-09-20 |
Family
ID=91905835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410798085.6A Active CN118382045B (en) | 2024-06-20 | 2024-06-20 | Loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118382045B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220608A (en) * | 2013-04-16 | 2013-07-24 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN105556987A (en) * | 2013-08-02 | 2016-05-04 | Pss比利时股份有限公司 | A loudspeaker with a helmholtz resonator |
| CN110560351A (en) * | 2019-08-15 | 2019-12-13 | 武汉大学 | Frequency-adjustable sound wave receiving device based on Helmholtz resonant cavity |
| CN110681559A (en) * | 2019-09-10 | 2020-01-14 | 武汉大学 | MEMS piezoelectric ultrasonic transducer with Helmholtz resonator |
| US20210067865A1 (en) * | 2019-08-28 | 2021-03-04 | Mordehai MARGALIT | System And Method For Generating An Audio Signal |
| CN114830685A (en) * | 2020-01-27 | 2022-07-29 | 松下电器（美国）知识产权公司 | Radio device |
-
2024
- 2024-06-20 CN CN202410798085.6A patent/CN118382045B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220608A (en) * | 2013-04-16 | 2013-07-24 | 歌尔声学股份有限公司 | Loudspeaker module |
| CN105556987A (en) * | 2013-08-02 | 2016-05-04 | Pss比利时股份有限公司 | A loudspeaker with a helmholtz resonator |
| CN110560351A (en) * | 2019-08-15 | 2019-12-13 | 武汉大学 | Frequency-adjustable sound wave receiving device based on Helmholtz resonant cavity |
| US20210067865A1 (en) * | 2019-08-28 | 2021-03-04 | Mordehai MARGALIT | System And Method For Generating An Audio Signal |
| CN110681559A (en) * | 2019-09-10 | 2020-01-14 | 武汉大学 | MEMS piezoelectric ultrasonic transducer with Helmholtz resonator |
| CN114830685A (en) * | 2020-01-27 | 2022-07-29 | 松下电器（美国）知识产权公司 | Radio device |
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| Publication number | Publication date |
|---|---|
| CN118382045B (en) | 2024-09-20 |
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