CN201345722Y - Low-frequency expansion device - Google Patents
Low-frequency expansion device Download PDFInfo
- Publication number
- CN201345722Y CN201345722Y CNU2008202294546U CN200820229454U CN201345722Y CN 201345722 Y CN201345722 Y CN 201345722Y CN U2008202294546 U CNU2008202294546 U CN U2008202294546U CN 200820229454 U CN200820229454 U CN 200820229454U CN 201345722 Y CN201345722 Y CN 201345722Y
- Authority
- CN
- China
- Prior art keywords
- low frequency
- loud speaker
- pipeline
- expanding unit
- sectional area
- 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.)
- Expired - Fee Related
Links
- 238000007789 sealing Methods 0.000 claims description 6
- 241001503991 Consolida Species 0.000 claims description 3
- 239000011358 absorbing material Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002889 sympathetic effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model discloses a low frequency expansion device, which is arranged in a box body and comprises at least two same loudspeakers and at least two same pipelines; one end of each duct is closed, the closed end is provided with a speaker, and the other ends of all the ducts are open to form a common outlet. The structure has excellent low-frequency effect and small volume.
Description
Technical field
The utility model relates to stereo set, particularly a kind of effectively device of expanded sound low frequency part.
Background technology
At present, in order to strengthen the acoustics of stereo set, the equipment of various expanded sounds begins to occur, as audio amplifier is exactly a kind of sound expansion equipment, along with the use of audio amplifier more and more widely, the style of audio amplifier is also various day by day, traditional audio amplifier generally is at casing internal fixation one loud speaker, and having some phonate holes at the front end of casing, the sound that loud speaker sends is propagated in casing, and is disseminated away by phonate hole after cabinet wall repeatedly reflects stack, yet, this kind loudspeaker box structure can't be expanded the frequency of sound low frequency part, and the low frequency signal loss is big, and bass is sent out to be come out, in order to improve the bass effect of audio amplifier, common way is the loudspeaker that is equipped with big power output at present, or in audio amplifier bigbore loud speaker is installed, yet can increase cost so unavoidably; On the other hand, because the pronunciation of audio amplifier is to utilize the audio amplifier inwall loud speaker to be sent the resonance principle of sound wave, therefore if will strengthen bass effect, can realize by the mode of strengthening audio amplifier sympathetic response effect, so just must increase the sympathetic response space of audio amplifier, yet this kind way can cause the volume of audio amplifier excessive, and it is big to take up room, the inconvenience carrying.
In view of this, the design people studies improvement at existing loudspeaker box structure, and this case produces thus.
The utility model content
Main purpose of the present utility model is to provide a kind of low frequency expanding unit, and its low-frequency effect is good, and volume is little.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of low frequency expanding unit is arranged in the casing, comprises at least two pipelines that identical loud speaker is identical with at least two; The one end sealing of each pipeline, this blind end is respectively arranged with a loud speaker, and the other end of all pipelines opens wide shared outlet of formation.
The length of above-mentioned pipeline be loud speaker the resonance frequency wavelength 25%.
The sectional area of the corresponding loud speaker of above-mentioned pipeline blind end is 1.25～2.5 times of loud speaker net sectional area.
The sectional area of above-mentioned pipeline exit equates with the sectional area of pipe sealing end.
Be provided with sound-absorbing material in the above-mentioned pipeline.
Be provided with damping material in the above-mentioned pipeline.
Above-mentioned pipeline is a bending.
The cross section of above-mentioned pipeline exit is the bugle shape.
After adopting such scheme, the utility model is by being provided with at least two loud speakers, and each loud speaker is fixedly installed on the blind end of a pipeline respectively, opening end with all pipelines is incorporated into same outlet again, thereby generation antiresonance, eliminate the unfavorable response in the covibration, make loud speaker on ducted still air post, produce maximum power, and at the certain length place of distance outlet, expansion through acoustic energy, the sound that all loud speakers sent all radiate in same outlet, strengthens the frequency of low frequency part, reaches low-frequency effect preferably.
Description of drawings
Fig. 1 is the generalized section of the utility model preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the utility model is elaborated.
With reference to shown in Figure 1, be the generalized section of a kind of low frequency expanding unit of the utility model, it comprises at least two loud speakers 2 and at least two pipelines 3, all is arranged in the casing.
One end of pipeline 3 sealing (being blind end 31) is provided with loud speaker 2 at this blind end 31, makes the sound that sends to the internal communication of pipeline 3, and utilizes the inwall of pipeline 3 repeatedly to reflect stack; And the other end of pipeline 3 opens wide, and the shared outlet 32 of all open ends, and the sectional area of this outlet 32 equates with the sectional area of blind end 31, further to utilize the principle of stacking of sound, the low frequency part of audio frequency is effectively expanded.
Present embodiment can be applicable in the audio amplifier, in use, loud speaker 2 and pipeline 3 are arranged in the casing (not shown), and the conjoint outlet 32 of all pipelines 3 is towards the portalling of box back, and makes the sound low frequency part of sending in the pipeline 3 reach better expansion; In addition, pipeline 3 more can adopt compact design, and its form is set to bending, to reduce volume, saving takes up room, particularly for the less audio amplifier of casing, because its finite volume, the area of cabinet wall is limited, so can't strengthen power to the direct reflection of sound wave by inwall, thereby can obtain the low frequency expansion by the tube wall of pipeline in the utility model 3 to the reflection stack of sound wave and strengthen sound power, have more practicality.
In order to reach better low frequency expansion effect, in the present embodiment, the length of pipeline 3 be loud speaker 2 the resonance frequency wavelength 25%, the resonance frequency of establishing loud speaker 2 is f
0, then the computing formula of the length L of pipeline 3 is
L＝c/4f
0≈86f
0
(wherein c is the propagation velocity of sound when temperature is 15 ℃, the c=340 meter per second)
By above-mentioned setting, outlet 32 places of pipeline 3 can produce the node of velocity loop and still air post acoustic pressure, and form velocity node and acoustic pressure maximum on the contrary at blind end 31, in this case, loud speaker 2 produces maximum power on the still air post of 3 li in pipeline, when in the certain length of distance outlet 32, about two loud speakers 2 through the expansion of acoustic energy, in same pipeline 3, radiate, thereby the expansion of enhancing low frequency reaches acoustics preferably towards outlet 32.
In addition, in the present embodiment, pipeline 3 is 1.25～2.5 times of loud speaker 2 net sectional areas at the sectional area of blind end 31 corresponding loud speakers 2, the net sectional area of loud speaker 2 is meant the area of bulging paper ring center circle herein, this kind structure also has the effect of enhancing to the low frequency frequency range of sound, can obtain good medium and low frequency tonequality.
For undesired upper frequency in the filtering bass back of the body ripple, present embodiment also in pipeline 3 appropriate location sound-absorbing material and damping material are set, to absorb the upper frequency in the sound wave, strengthen low frequency radiation, make purer low frequency signal by outlet 32 outputs,
In the present embodiment, also the cross sectional shape of the outlet 32 of pipeline 3 is set to the bugle shape, with the efficient of effective raising bass frequencies.
In sum, a kind of low frequency expanding unit of the utility model, focus in casing, being provided with at least two loud speakers 2, and it is loud speaker 2 is corresponding one by one, be fixedly installed on the blind end 31 of pipeline 3 respectively, the sound that loud speaker 2 is sent superposes after the inwall of pipeline 3 repeatedly reflects, and produces maximum power on the still air post that is produced, and radiate from the shared outlet 32 of pipeline 3, realize effective expansion of sound low frequency part.
Above embodiment only is explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every according to the technological thought that the utility model proposes, any change of being done on the technical scheme basis all falls within the utility model protection range.
Claims (8)
1, a kind of low frequency expanding unit is arranged in the casing, it is characterized in that: comprise at least two pipelines that identical loud speaker is identical with at least two; The one end sealing of each pipeline, this blind end is respectively arranged with a loud speaker, and the other end of all pipelines opens wide shared outlet of formation.
2, a kind of low frequency expanding unit as claimed in claim 1 is characterized in that: the length of described pipeline be loud speaker the resonance frequency wavelength 25%.
3, a kind of low frequency expanding unit as claimed in claim 1 is characterized in that: the sectional area of the corresponding loud speaker of described pipe sealing end is 1.25～2.5 times of loud speaker net sectional area.
4, a kind of low frequency expanding unit as claimed in claim 1, it is characterized in that: the sectional area of described pipeline exit equates with the sectional area of pipe sealing end.
5, a kind of low frequency expanding unit as claimed in claim 1 is characterized in that: be provided with sound-absorbing material in the described pipeline.
6, a kind of low frequency expanding unit as claimed in claim 1 is characterized in that: be provided with damping material in the described pipeline.
7, a kind of low frequency expanding unit as claimed in claim 1, it is characterized in that: described pipeline is a bending.
8, a kind of low frequency expanding unit as claimed in claim 1, it is characterized in that: the cross section of described pipeline exit is the bugle shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202294546U CN201345722Y (en) | 2008-12-15 | 2008-12-15 | Low-frequency expansion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202294546U CN201345722Y (en) | 2008-12-15 | 2008-12-15 | Low-frequency expansion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201345722Y true CN201345722Y (en) | 2009-11-11 |
Family
ID=41277306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202294546U Expired - Fee Related CN201345722Y (en) | 2008-12-15 | 2008-12-15 | Low-frequency expansion device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201345722Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694505A (en) * | 2012-05-02 | 2012-09-26 | 张靖 | Passive audio amplifier |
| CN105493517A (en) * | 2013-04-30 | 2016-04-13 | 李光熙 | Speaker apparatus |
| CN107959908A (en) * | 2017-11-22 | 2018-04-24 | 江苏鹏美电声器材有限公司 | A kind of speaker |
| CN108367717A (en) * | 2016-03-11 | 2018-08-03 | 宝马股份公司 | Include the boot of integrated loudspeaker assembly |
| CN108848432A (en) * | 2014-09-30 | 2018-11-20 | 苹果公司 | Loudspeaker |
| US10524044B2 (en) | 2014-09-30 | 2019-12-31 | Apple Inc. | Airflow exit geometry |
| US10631071B2 (en) | 2016-09-23 | 2020-04-21 | Apple Inc. | Cantilevered foot for electronic device |
| CN112770221A (en) * | 2020-12-26 | 2021-05-07 | 王鑫洪 | Personal sound system and application thereof |
| US11256338B2 (en) | 2014-09-30 | 2022-02-22 | Apple Inc. | Voice-controlled electronic device |
-
2008
- 2008-12-15 CN CNU2008202294546U patent/CN201345722Y/en not_active Expired - Fee Related
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102694505A (en) * | 2012-05-02 | 2012-09-26 | 张靖 | Passive audio amplifier |
| CN102694505B (en) * | 2012-05-02 | 2016-09-14 | 张靖 | A kind of passive audio amplifier |
| CN105493517A (en) * | 2013-04-30 | 2016-04-13 | 李光熙 | Speaker apparatus |
| USRE49437E1 (en) | 2014-09-30 | 2023-02-28 | Apple Inc. | Audio driver and power supply unit architecture |
| US11256338B2 (en) | 2014-09-30 | 2022-02-22 | Apple Inc. | Voice-controlled electronic device |
| CN108848432A (en) * | 2014-09-30 | 2018-11-20 | 苹果公司 | Loudspeaker |
| US10524044B2 (en) | 2014-09-30 | 2019-12-31 | Apple Inc. | Airflow exit geometry |
| CN108848432B (en) * | 2014-09-30 | 2020-03-24 | 苹果公司 | Loudspeaker |
| US12192698B2 (en) | 2014-09-30 | 2025-01-07 | Apple Inc. | Loudspeaker with reduced audio coloration caused by reflections from a surface |
| US10652650B2 (en) | 2014-09-30 | 2020-05-12 | Apple Inc. | Loudspeaker with reduced audio coloration caused by reflections from a surface |
| US10728652B2 (en) | 2014-09-30 | 2020-07-28 | Apple Inc. | Adaptive array speaker |
| US11818535B2 (en) | 2014-09-30 | 2023-11-14 | Apple, Inc. | Loudspeaker with reduced audio coloration caused by reflections from a surface |
| US11290805B2 (en) | 2014-09-30 | 2022-03-29 | Apple Inc. | Loudspeaker with reduced audio coloration caused by reflections from a surface |
| CN108367717A (en) * | 2016-03-11 | 2018-08-03 | 宝马股份公司 | Include the boot of integrated loudspeaker assembly |
| US11693487B2 (en) | 2016-09-23 | 2023-07-04 | Apple Inc. | Voice-controlled electronic device |
| US10911863B2 (en) | 2016-09-23 | 2021-02-02 | Apple Inc. | Illuminated user interface architecture |
| US10834497B2 (en) | 2016-09-23 | 2020-11-10 | Apple Inc. | User interface cooling using audio component |
| US11693488B2 (en) | 2016-09-23 | 2023-07-04 | Apple Inc. | Voice-controlled electronic device |
| US10771890B2 (en) | 2016-09-23 | 2020-09-08 | Apple Inc. | Annular support structure |
| US12147610B2 (en) | 2016-09-23 | 2024-11-19 | Apple Inc. | Voice-controlled electronic device |
| US10631071B2 (en) | 2016-09-23 | 2020-04-21 | Apple Inc. | Cantilevered foot for electronic device |
| CN107959908A (en) * | 2017-11-22 | 2018-04-24 | 江苏鹏美电声器材有限公司 | A kind of speaker |
| CN112770221A (en) * | 2020-12-26 | 2021-05-07 | 王鑫洪 | Personal sound system and application thereof |
| WO2022135191A1 (en) * | 2020-12-26 | 2022-06-30 | 深圳市珑为科技有限公司 | Personal audio system and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20101215 |