CN204791951U - An active noise reduction system in a car - Google Patents
An active noise reduction system in a car Download PDFInfo
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- CN204791951U CN204791951U CN201520489337.3U CN201520489337U CN204791951U CN 204791951 U CN204791951 U CN 204791951U CN 201520489337 U CN201520489337 U CN 201520489337U CN 204791951 U CN204791951 U CN 204791951U
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- 238000013459 approach Methods 0.000 description 1
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
The utility model discloses an initiative noise reduction system in car, including connecting in order: the at least one microphone is used for collecting original noise signals in the vehicle; the signal reverse processing circuit is used for converting the noise signal collected by the microphone into a phase reverse noise signal; the power amplification module is used for amplifying the phase reversal noise signal to the amplitude of the original noise signal; and the sound generator is used for outputting sound waves with the same phase and reverse amplitude as the original noise signals in the vehicle. The utility model discloses a ANC principle of making an uproar falls in the initiative can offset each other after superposing two frequencies and the sine wave signal that the amplitude is the same, the phase difference 180 degrees, and utilizes this principle just to realize the interior noise elimination effect of car, obtains the interior environment of a car that we required are quiet relatively.
Description
Technical field
The utility model relates to a kind of noise reduction system, particularly active noise reduction system in a kind of Automobile.
Background technology
In car steering and taking, in order to obtain a comparatively quiet comfortable environment, away from noisy noise (as: engine roar, car body vibrating noise) puzzlement be that people pursue, automobile industry was reduce vehicle-mounted air resistance coefficient to eliminate the common practice of noise in car in the past, such as at hood, tire periphery, the position of case cover inferior generation noise is added a large amount of sound-proof materials and is carried out physics noise reduction, but depend on characteristic of sound-proof material itself and the consumption of material due to physics noise reduction, and the development of materialogy is quite slow, increase sound-proof material simply and bottleneck has been absorbed in the noise eradicating efficacy that car weight also brings burden so that automobile.
Utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide active noise reduction system in a kind of Automobile.
The technical solution adopted in the utility model is:
Active noise reduction system in a kind of Automobile, comprises and connecting in turn: at least one microphone, for gathering original noise signal in car; One signals reverse treatment circuit, the noise signal for being gathered by microphone is converted into the reverse noise signal of phase place; One power amplifier module, for amplifying the amplitude of the reverse noise signal of described phase place to original noise signal; One acoustical generator, for exporting the sound wave identical with the reverse amplitude of original noise signal phase in car.
Described microphone is MIC microphone.
Described acoustical generator is loudspeaker.
The beneficial effects of the utility model:
The utility model adopts ANC active noise reduction principle, can cancel out each other after two frequency sine wave signals that are identical with amplitude, phase 180 degree are superposed, and utilize this principle just can realize noise eradicating efficacy in car, obtain a relatively quiet environment inside car needed for us.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present utility model, instead of whole embodiments, those skilled in the art under accompanying drawing illustrates prerequisite, other design proposals of acquisition and accompanying drawing:
Fig. 1 is the spectral contrast figure of active noise reduction and passive Noise Reduction scope;
Fig. 2 is the schematic diagram of the utility model active noise reduction;
Fig. 3 is the theory diagram of the utility model active noise reduction system;
Fig. 4 is the design sketch of the utility model active noise reduction system.
Embodiment
With reference to shown in Fig. 1, in noise signal, high frequency waves length, is easily absorbed by sound-proof material; But for the low frequency signal that wavelength is long, diffraction seriously and is not easily absorbed, and low-frequency range uses traditional physics noise reduction (sound-proof material) more difficult elimination, so ANC active noise reduction principle can be adopted to eliminate it.
As shown in Figure 2, ANC active noise reduction principle can be cancelled out each other after superposing based on two frequency sine wave signals that are identical with amplitude, phase 180 degree, it does not limit by the length of wavelength, utilize this principle just can realize noise eradicating efficacy in car, in figure, solid line is noise signal, and dotted line is the reverse signal after process.
Figure 3 shows that active noise reduction system in a kind of Automobile that the present embodiment adopts, comprise and connecting in turn: at least one microphone, for gathering original noise signal in car; One signals reverse treatment circuit, the noise signal for being gathered by microphone is converted into the reverse noise signal of phase place; One power amplifier module, for amplifying the amplitude of the reverse noise signal of described phase place to original noise signal; One acoustical generator, for exporting the sound wave identical with the reverse amplitude of original noise signal phase in car.
Concrete implementation method is: in compartment, the microphone (MIC) of some is loaded in appropriate location, the noise signal be used in pickup vehicle, by pickup to noise signal send in signals reverse treatment circuit carry out analyzing, compensate, comparison and make its phase place reverse 180 degree process after, send the sound wave identical with the most reverse amplitude of raw noise phase place by loudspeaker after the power amplifier module giving vehicle-mounted interior device amplifies, thus eliminate the noise in whole compartment closed-loop system.
Due to the process that this is a feedback, so in some cases, closed-loop system may be unstable.So noise signal reverse process circuit should as far as possible at a high speed, high precision reduction noise signal, and whole environment inside car structure will do corresponding calculating test acoustic characteristic, again according to reality adjustment noise signal treatment circuit, finally well can eliminate noise in part car and reach the effect of our noise reduction, as shown in Figure 4.
The foregoing is only preferred embodiments of the present utility model, the utility model is not limited to above-mentioned embodiment, as long as the technical scheme realizing the utility model object with basic same approach all belongs within protection domain of the present utility model.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520489337.3U CN204791951U (en) | 2015-07-07 | 2015-07-07 | An active noise reduction system in a car |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520489337.3U CN204791951U (en) | 2015-07-07 | 2015-07-07 | An active noise reduction system in a car |
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| CN204791951U true CN204791951U (en) | 2015-11-18 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105872908A (en) * | 2016-05-23 | 2016-08-17 | 北京长安汽车工程技术研究有限责任公司 | Denoising method and device for brake system |
| CN106205592A (en) * | 2016-06-24 | 2016-12-07 | 努比亚技术有限公司 | A kind of denoising device and method |
| CN107131054A (en) * | 2017-04-27 | 2017-09-05 | 深圳市赛梅斯凯科技有限公司 | Active noise reduction system and device in a kind of Automobile |
| CN107195294A (en) * | 2017-04-07 | 2017-09-22 | 吉利汽车研究院（宁波）有限公司 | A kind of active denoising method and device for vehicle |
| CN108156555A (en) * | 2016-12-02 | 2018-06-12 | 中车株洲电力机车研究所有限公司 | A kind of train active noise reduction system and method |
| CN110942762A (en) * | 2019-12-06 | 2020-03-31 | 苏州市华音电子科技有限公司 | Control method and system for performing frequency-band noise elimination on vehicle |
| CN114333755A (en) * | 2022-03-17 | 2022-04-12 | 滨州学院 | Intelligent monitoring and noise reduction device and method for in-car noise in automobile running |
-
2015
- 2015-07-07 CN CN201520489337.3U patent/CN204791951U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105872908A (en) * | 2016-05-23 | 2016-08-17 | 北京长安汽车工程技术研究有限责任公司 | Denoising method and device for brake system |
| CN106205592A (en) * | 2016-06-24 | 2016-12-07 | 努比亚技术有限公司 | A kind of denoising device and method |
| CN106205592B (en) * | 2016-06-24 | 2020-07-28 | 努比亚技术有限公司 | Noise reduction device and method |
| CN108156555A (en) * | 2016-12-02 | 2018-06-12 | 中车株洲电力机车研究所有限公司 | A kind of train active noise reduction system and method |
| CN108156555B (en) * | 2016-12-02 | 2020-05-05 | 中车株洲电力机车研究所有限公司 | Active noise reduction system and method for train |
| CN107195294A (en) * | 2017-04-07 | 2017-09-22 | 吉利汽车研究院（宁波）有限公司 | A kind of active denoising method and device for vehicle |
| CN107195294B (en) * | 2017-04-07 | 2020-07-21 | 吉利汽车研究院（宁波）有限公司 | A kind of active noise reduction method and device for vehicle |
| CN107131054A (en) * | 2017-04-27 | 2017-09-05 | 深圳市赛梅斯凯科技有限公司 | Active noise reduction system and device in a kind of Automobile |
| CN110942762A (en) * | 2019-12-06 | 2020-03-31 | 苏州市华音电子科技有限公司 | Control method and system for performing frequency-band noise elimination on vehicle |
| CN114333755A (en) * | 2022-03-17 | 2022-04-12 | 滨州学院 | Intelligent monitoring and noise reduction device and method for in-car noise in automobile running |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170503 Address after: 528400 Guangdong province Zhongshan Torch Development Zone, Cheung Hing Road 6 No. 11 South trade building, floor 1108 card Patentee after: Zhongshan Tianyi Communication Technology Co., Ltd. Address before: 528400 Guangdong City, Zhongshan City, the town of Victoria Sheng community residents committee Patentee before: Zhongshan Tianjian Electroacoustic Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181115 Address after: 341000 Ouxiang Road, Shangyou Industrial Zone, Yudu County, Ganzhou City, Jiangxi Province Patentee after: Ganzhou Ouxiang Electronics Co., Ltd. Address before: 528400 South Wing of No.6 Number Trade Building, Xiangxing Road, Zhongshan Torch Development Zone, Guangdong Province Patentee before: Zhongshan Tianyi Communication Technology Co., Ltd. |