CN207835739U - Active noise reduction system and active noise reduction earphone - Google Patents
Active noise reduction system and active noise reduction earphone Download PDFInfo
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- CN207835739U CN207835739U CN201820240251.0U CN201820240251U CN207835739U CN 207835739 U CN207835739 U CN 207835739U CN 201820240251 U CN201820240251 U CN 201820240251U CN 207835739 U CN207835739 U CN 207835739U
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- dynamic equalizer
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Abstract
A kind of active noise reduction system of the utility model offer and active noise reduction earphone, active noise reduction system include active noise reduction module, dynamic equalizer module, control module, sound detection module and audio output module.Realize elimination to ambient noise using the noise cancellation signal that active noise reduction module generates, using dynamic equalizer realize due in caused by active noise reduction, the compensation of low frequency sound quality loss.Compared with existing active noise reduction earphone, due to adding dynamic equalizer, the frequency range that can be directed to active noise reduction system damage makes corresponding sound quality compensation, and this compensation has real-time, the online dynamic for realizing sound quality compensates, and improves the quality that active noise reduction earphone plays audio.
Description
Technical field
The utility model is related to active noise reduction techniques fields, and in particular to a kind of active noise reduction system and active noise reduction ear
Machine.
Background technology
With the sustainable development of active noise reduction techniques, requirement of the consumer to active noise reduction earphone is also higher and higher, not only
Need to have good noise reduction, sound quality when also ensureing to play audio.Active noise reduction earphone is to ensure noise reduction, in ear
Machine configuration aspects need to close earphone back cavity, ensure that speaker diaphragm is frivolous and earphone impedance cannot be too high, these three aspects are
It can lead to the sound quality deterioration of noise cancelling headphone.In terms of noise reduction strategies, active noise reduction earphone is generated by secondary source of sound and is made an uproar with environment
Acoustic amplitude is equal, opposite in phase noise cancellation signal realizes active noise reduction, but also can simultaneously in the ambient noise for eliminating corresponding band
The audio signal of the frequency range is eliminated so that noise cancelling headphone serious distortion occurs when playing the audio.
Utility model content
First of the utility model is designed to provide a kind of active noise reduction system, is being broadcast with solving existing noise cancelling headphone
The technical issues of will appear serious distortion when playback frequency.
Active noise reduction system provided by the utility model, including active noise reduction module, dynamic equalizer module, control mould
Block, sound detection module and audio output module.
Wherein, the active noise reduction module, the dynamic equalizer module and the audio output module are sequentially connected, institute
It states active noise reduction module and the audio output module to be connected with the sound detection module, the active noise reduction module receives
Audio signal from outer audio equipment and the noise signal from the sound detection module.
The active noise reduction module, the audio output module and the dynamic equalizer module with the control module
It is connected.
Further, the active noise reduction module includes connected the first analog to digital conversion circuit and digital filter.
The outer audio equipment and the sound detection module are connect with first analog to digital conversion circuit, the number
Word filter handles the digital signal that first analog to digital conversion circuit is handled, and the number that processing obtains is believed
Number output is in the dynamic equalizer module.
Further, the dynamic equalizer module includes connected dynamic equalizer and D/A converting circuit.
The dynamic equalizer is connected with the digital filter, and the dynamic equalizer and the control module phase
Even, the D/A converting circuit is connected with the audio output module, will be through handling obtained analog signal output to the sound
In frequency output module.
Further, the dynamic equalizer includes multiple concatenated second order filters.
Further, the control module includes connected controller and the second analog to digital conversion circuit.
The digital filter and the dynamic equalizer are connected with the controller, the audio output module and institute
It states the second analog to digital conversion circuit to be connected, the controller can receive the noise cancellation signal from the digital filter and come from institute
The audio signal of audio output module is stated, and control signal is exported to the dynamic equalizer.
Further, the sound detection module includes microphone.
Further, the audio output module includes loud speaker.
The advantageous effect that the utility model active noise reduction system is brought is：
By the way that active noise reduction module, dynamic equalizer module, control module, sound detection module and audio output mould is arranged
Block, wherein active noise reduction module, each audio output module of dynamic equalizer module are sequentially connected, active noise reduction module and audio
Output module is connected with sound detection module, active noise reduction module can receive audio signal from outer audio equipment and
Noise signal from sound detection module.Also, active noise reduction module, audio output module and dynamic equalizer module with
Control module is connected.
The operation principle of the active noise reduction system is：Active noise reduction module receives the audio from outer audio equipment respectively
Signal and noise signal from sound detection module export noise cancellation signal to dynamic equalizer module after noise reduction process；
The audio signal that the noise cancellation signal and audio playing module that control module is exported according to active noise reduction module play, judges whether
The sound quality compensation function of unlatching dynamic equalizer module is needed, and will determine that structure output to dynamic equalizer module；Dynamic is
Weighing apparatus module receives the noise cancellation signal from active noise reduction module, meanwhile, it is according to the control signal judgement from control module
It is no to open the sound quality compensation function of dynamic equalizer module, and the noise cancellation signal after compensation is exported to audio output module.
The active noise reduction system realizes the elimination to ambient noise using the noise cancellation signal that active noise reduction module generates, profit
It is realized to the compensation due to middle low frequency sound quality loss caused by active noise reduction with dynamic equalizer module so that the active noise reduction
The frequency range that system can be directed to active noise reduction damage makes corresponding sound quality compensation, to realize the real-time online dynamic of sound quality
Compensation improves the audio quality of active noise reduction system broadcasting well.
Second of the utility model is designed to provide a kind of active noise reduction earphone, is being broadcast with solving existing noise cancelling headphone
The technical issues of will appear serious distortion when playback frequency.
Active noise reduction earphone provided by the utility model, including above-mentioned active noise reduction system.
Further, further include earphone case, the active noise reduction system is located in the earphone case.
The utility model active noise reduction earphone belt come advantageous effect be：
By the way that above-mentioned active noise reduction system is arranged in active noise reduction earphone, to improve the audio quality played, correspondingly,
The active noise reduction earphone has the institute of above-mentioned active noise reduction system advantageous, and this is no longer going to repeat them.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram of the utility model embodiment active noise reduction system；
Fig. 2 is the structural schematic diagram of active noise reduction module in the utility model embodiment active noise reduction system；
Fig. 3 is the structural schematic diagram of dynamic equalizer module in the utility model embodiment active noise reduction system；
Fig. 4 is the structural schematic diagram of control module in the utility model embodiment active noise reduction system；
Fig. 5 is the connection relation of digital filter and dynamic equalizer in the utility model embodiment active noise reduction system
Schematic diagram；
Fig. 6 is the structural schematic diagram of the utility model embodiment another kind active noise reduction system.
Icon：100- active noise reduction modules；200- dynamic equalizer modules；300- audio output modules；400- controls mould
Block；500- sound detection modules；The first analog to digital conversion circuits of 110-；120- digital filters；210- dynamic equalizers；220- numbers
Analog conversion circuit；410- controllers；The second analog to digital conversion circuits of 420-.
Specific implementation mode
It is new to this practicality below in conjunction with attached drawing to keep the purpose of this utility model, technical solution and advantage clearer
The technical solution of type carries out clear, complete description.Obviously, described embodiment is only that the part of the utility model is implemented
Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "inner", "outside"
It is to be based on the orientation or positional relationship shown in the drawings, it is only for convenient for description the utility model and simplify description, without
It is instruction or implies that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore not
It can be construed as a limitation of the present invention.In addition, term " first ", " second " are used for description purposes only, and should not be understood as
Instruction implies relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term is " even
Connect ", " connected " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in utility model.
As shown in Figure 1, a kind of active noise reduction system is present embodiments provided, including active noise reduction module 100, dynamic equalization
Device module 200, control module 400, sound detection module 500 and audio output module 300.Specifically, active noise reduction module
100, dynamic equalizer module 200 and audio output module 300 are sequentially connected, active noise reduction module 100 and audio output module
300 are connected with sound detection module 500, and active noise reduction module 100 can receive the audio signal from outer audio equipment
With the noise signal from sound detection module 500.Also, active noise reduction module 100, audio output module 300 and dynamic are
Weighing apparatus module 200 is connect with control module 400.
The operation principle of the active noise reduction system is：Active noise reduction module 100 is received respectively from outer audio equipment
Audio signal and noise signal from sound detection module 500 export noise cancellation signal to dynamic equalization after noise reduction process
Device module 200；What the noise cancellation signal and audio playing module that control module 400 is exported according to active noise reduction module 100 played
Audio signal judges whether to need the sound quality compensation function for opening dynamic equalizer module 200, and will determine that structure output to dynamic
State equalizer module 200；Dynamic equalizer module 200 receives the noise cancellation signal from active noise reduction module 100, meanwhile, according to
It is determined whether to enable the sound quality compensation functions of dynamic equalizer module 200 for control signal from control module 400, and will compensation
Noise cancellation signal afterwards is exported to audio output module 300.
The active noise reduction system is realized using the noise cancellation signal that active noise reduction module 100 generates disappears to ambient noise
It removes, is realized to the compensation due to middle low frequency sound quality loss caused by active noise reduction using dynamic equalizer module 200 so that should
The frequency range that active noise reduction system can be directed to active noise reduction damage makes corresponding sound quality compensation, to realize the real-time of sound quality
Online dynamic compensates, and improves the audio quality of active noise reduction system broadcasting well.
As shown in Fig. 2, in the present embodiment, active noise reduction module 100 includes 110 sum number of the first analog to digital conversion circuit being connected
Word filter 120.Specifically, outer audio equipment and sound detection module 500 are connect with the first analog to digital conversion circuit 110,
The number that the digital signal that the processing of first analog to digital conversion circuit 110 obtains is handled, and processing is obtained by digital filter 120
Word signal is exported into dynamic equalizer module 200.Above-mentioned first analog to digital conversion circuit 110 is used for will be from the sound of audio frequency apparatus
The noise signal of frequency signal and sound detection module 500 is converted to digital signal by analog signal, and the digital signal is passed
Transport to digital filter 120.
As shown in figure 3, in the present embodiment, dynamic equalizer module 200 includes that connected dynamic equalizer 210 and digital-to-analogue turn
Change circuit 220.Specifically, dynamic equalizer 210 is connected with digital filter 120, and dynamic equalizer 210 and control module
400 are connected, and D/A converting circuit 220 is connected with audio output module 300, will be through handling obtained analog signal output to audio
In output module 300.
Specifically, as shown in figure 4, control module 400 includes connected controller 410 and the second analog to digital conversion circuit 420,
In the present embodiment, dynamic equalizer 210 is connected with controller 410, as shown in Figure 6.
Dynamic equalizer 210 receives the noise cancellation signal from digital filter 120, and the control exported according to controller 410
Signal processed judges whether that sound quality is needed to compensate, and the noise cancellation signal after sound quality is compensated is exported to audio output module 300.
In the present embodiment, dynamic equalizer 210 includes multiple concatenated second order filters.Dynamic equalizer 210 be directed to by
Caused by 120 noise reduction of digital filter sound quality loss compensate, therefore with the frequency characteristic phase of digital filter 120
It closes.By the way that multiple concatenated second order filters are arranged so that greatly improved to the compensation effect of sound quality.
In addition, as shown in figure 5, in the present embodiment, active noise reduction module 100 can also include multiple digital filters 120,
Corresponding, dynamic equalizer module 200 includes multiple dynamic equalizers 210, and each digital filter 120 is separately connected one and moves
State balanced device 210.Also, different digital filters 120 can also be designed for different ambient noises, and is each number
Filter 120 matches corresponding dynamic compensator 210.
Such setting so that the active noise reduction system can be selected according to the environmental aspect residing for user suitable at this
The digital filter 120 of noise reduction is connected with dynamic equalizer 210 under kind environment, to meet at the noise reduction under a variety of varying environments
Reason, to realize that the sound quality under optimal noise reduction compensates, to further ensure the noise reduction of the present embodiment active noise reduction system
Reliability.
Please continue to refer to Fig. 6, in the present embodiment, controller 410 receives noise cancellation signal and sound from digital filter 120
The digital signal of frequency output module 300 being converted into through the second analog to digital conversion circuit 420 judges whether to need to carry out sound based on this
Matter compensates, if it is judged that for only simple playing audio signal, does not then need audio compensation, at this time dynamic equalizer
210 do not work；If it is judged that open decrease of noise functions and playing audio signal, then needs to carry out audio compensation, move at this time
State balanced device 210 is the higher order filter generated by two second order filter series connection.
In the present embodiment, sound detection module 500 includes microphone.Wherein, the acoustical signal of sound is converted by microphone
Electric signal.Active noise reduction module 100, dynamic equalizer module 200 and control module 400 are based on electric signal and are handled.
In the present embodiment, audio output module 300 includes loud speaker.The electric signal of sound is converted into sound letter by loud speaker
Number.
The present embodiment additionally provides a kind of active noise reduction earphone, including above-mentioned active noise reduction system.
By the way that above-mentioned active noise reduction system is arranged in active noise reduction earphone, to improve the audio quality played, correspondingly,
The active noise reduction earphone has the institute of above-mentioned active noise reduction system advantageous, and this is no longer going to repeat them.
In the present embodiment, which can also include earphone case, specifically, active noise reduction system is fixedly arranged on
In earphone case.
Specifically, earphone case can be ear-shield type.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：
It can still modify to the technical solution recorded in previous embodiment, either to which part or all technical features
Carry out equivalent replacement；And these modifications or replacements, the utility model embodiment that it does not separate the essence of the corresponding technical solution
The range of technical solution.
Claims (9)
1. a kind of active noise reduction system, which is characterized in that including active noise reduction module, dynamic equalizer module, control module, sound
Sound detection module and audio output module；
Wherein, the active noise reduction module, the dynamic equalizer module and the audio output module are sequentially connected, the master
Dynamic noise reduction module and the audio output module are connected with the sound detection module, and the active noise reduction module reception comes from
The audio signal of outer audio equipment and noise signal from the sound detection module；
The active noise reduction module, the audio output module and the dynamic equalizer module with the control module phase
Even.
2. active noise reduction system according to claim 1, which is characterized in that the active noise reduction module includes connected
One analog to digital conversion circuit and digital filter；
The outer audio equipment and the sound detection module are connect with first analog to digital conversion circuit, the number filter
Wave device handles the digital signal that first analog to digital conversion circuit is handled, and the digital signal that processing is obtained is defeated
Go out into the dynamic equalizer module.
3. active noise reduction system according to claim 2, which is characterized in that the dynamic equalizer module includes connected
Dynamic equalizer and D/A converting circuit；
The dynamic equalizer is connected with the digital filter, and the dynamic equalizer is connected with the control module, institute
D/A converting circuit is stated with the audio output module to be connected, it will be through handling obtained analog signal output to the audio output
In module.
4. active noise reduction system according to claim 3, which is characterized in that the dynamic equalizer includes multiple concatenated
Second order filter.
5. active noise reduction system according to claim 3, which is characterized in that the control module includes connected controller
With the second analog to digital conversion circuit；
The digital filter and the dynamic equalizer are connected with the controller, the audio output module and described the
Two analog to digital conversion circuits are connected, and the controller can receive the noise cancellation signal from the digital filter and come from the sound
The audio signal of frequency output module, and control signal is exported to the dynamic equalizer.
6. active noise reduction system according to claim 1, which is characterized in that the sound detection module includes microphone.
7. active noise reduction system according to claim 1, which is characterized in that the audio output module includes loud speaker.
8. a kind of active noise reduction earphone, which is characterized in that including such as claim 1-7 any one of them active noise reduction system.
9. active noise reduction earphone according to claim 8, which is characterized in that further include earphone case, the active noise reduction
System is fixedly arranged in the earphone case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820240251.0U CN207835739U (en) | 2018-02-09 | 2018-02-09 | Active noise reduction system and active noise reduction earphone |
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|---|---|---|---|
| CN201820240251.0U CN207835739U (en) | 2018-02-09 | 2018-02-09 | Active noise reduction system and active noise reduction earphone |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108156551A (en) * | 2018-02-09 | 2018-06-12 | 会听声学科技（北京）有限公司 | Active noise reduction system, active noise reduction earphone and active denoising method |
| CN109246513A (en) * | 2018-09-30 | 2019-01-18 | 歌尔科技有限公司 | A kind of active noise reduction earphone and its noise-reduction method, device |
| CN115665643A (en) * | 2022-12-12 | 2023-01-31 | 杭州兆华电子股份有限公司 | Method and system for evaluating active noise reduction effect of earphone |
-
2018
- 2018-02-09 CN CN201820240251.0U patent/CN207835739U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108156551A (en) * | 2018-02-09 | 2018-06-12 | 会听声学科技（北京）有限公司 | Active noise reduction system, active noise reduction earphone and active denoising method |
| CN109246513A (en) * | 2018-09-30 | 2019-01-18 | 歌尔科技有限公司 | A kind of active noise reduction earphone and its noise-reduction method, device |
| CN115665643A (en) * | 2022-12-12 | 2023-01-31 | 杭州兆华电子股份有限公司 | Method and system for evaluating active noise reduction effect of earphone |
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