CN206024053U - Active noise reduction In-Ear Headphones - Google Patents
Active noise reduction In-Ear Headphones Download PDFInfo
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- CN206024053U CN206024053U CN201620882842.9U CN201620882842U CN206024053U CN 206024053 U CN206024053 U CN 206024053U CN 201620882842 U CN201620882842 U CN 201620882842U CN 206024053 U CN206024053 U CN 206024053U
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Abstract
The utility model is related to the active noise reduction In-Ear Headphones of communication technique field, including earphone case, rear chamber, middle chamber and front cavity is provided with inside earphone case, feedforward microphone is horizontally installed with back cavity body, the bottom of front cavity is the sound mouth for spreading out of sound, rear feed microphone is installed in ante-chamber body, the ante-chamber passage with front cavity conducting is additionally provided with earphone case, ante-chamber passage is located at and is connect on the identical earphone case of sound mouth direction with feedforward, and the angle that the axis of ante-chamber passage and feedforward are connect between the axis of sound mouth is less than 90 degree.Compared with traditional earphone, noise is entered from ante-chamber passage, when the noise source of ante-chamber passage is entered in different directions, noise enters the passage of duct can be more consistent, at higher frequencies, the change of active noise reduction performance is more consistent, and the wave filter target for entering the different noises of ante-chamber passage from different directions is more consistent.
Description
Technical field
The utility model is related to communication technique field, more particularly to a kind of earphone, and in particular to the In-Ear ear of active noise reduction
Machine.
Background technology
Conventional earphone is mainly made up of four parts：Headband, phonation unit, earmuff and lead；Headband is used for earmuff
It is fixed on ear, lead is used for for audio signal being transported to phonation unit from sound equipment, and phonation unit is arranged in earmuff.Existing
Earphone generally there is decrease of noise functions, respectively a microphone collection sound sample is set outside two earmuffs in left and right, works as external noise
When more various and changeable, each earmuff only one of which collects the sampling microphone of whole noises, and noise certainly will be caused to adopt
The direction of sample is narrow and fine accurate, so as to be unable to reach the noise reduction of high-quality.In order to solve the defect of above-mentioned earphone, existing
Occurred using dual microphone noise reduction schemes on the market, i.e., two microphones be set in terminal diverse location and be acquired sound sample,
After the audio signal for comparing two microphone collections, the signal of noise attenuation signal frequency range reaches noise reduction purpose.
In most of earphones, as shown in figure 1, including earphone case, be respectively equipped with earphone case the first microphone B1,
Second microphone B2, pronunciation unit B3, ante-chamber blow vent B4, back cavity blow vent B5, the first microphone B1 are located at pronunciation unit B3
Top, second microphone B2 be located at pronunciation unit B3 lower section.The pronunciation face that ante-chamber blow vent B4 is located at pronunciation unit is corresponding
Shell on, environmental noise enter duct main thoroughfare through ante-chamber blow vent B4, when noise source is in different directions,
Noise enters the passage of duct it may happen that very big change.Then, when noise direction changes, the performance meeting of active noise reduction
Vary widely, through tight accurate test, as shown in Fig. 2 solid line is designated as the active drop of the noise entered from front direction
Make an uproar performance chart, thicker dotted line is designated as the active noise reduction performance chart of the noise for entering from the side, thinner
Dotted line is designated as the active noise reduction performance chart of the noise entered from posterior direction, under the frequency higher than 300Hz, actively drops
The change of the performance that makes an uproar more than 10dB, meanwhile, as shown in figure 3, amplitude of the wave filter target under different noise directions has additionally
The difference of 6dB（After 2KHz）, as wave filter target is plural number in Fig. 3, so using amplitude（Upper figure）And phase place（Figure below）Two
Graph expression, in Fig. 3, solid line is designated as wave filter target from the noise variation curve map for above entering, and thicker dotted line is designated as
The noise variation curve map that wave filter target is entered from side, thinner dotted line are designated as wave filter target from making an uproar for entering below
Sound change curve.Structure on the corresponding shell in traditional pronunciation face that ante-chamber blow vent is arranged at pronunciation unit, when
, when different directions, the passage that noise enters duct is inconsistent for noise source, particularly at higher frequencies, meanwhile, filtering
Amplitude of the device target under different noise directions has significant change, so as to affect overall noise reduction.
Utility model content
The purpose of this utility model is to solve disadvantages described above, there is provided active noise reduction In-Ear Headphones, its actively drop what mouth was made an uproar
More preferably, and which actively drops performance that mouth makes an uproar under different noise directions with uniformity to effect.
The purpose of this utility model is achieved in the following ways：
Active noise reduction In-Ear Headphones, including earphone case, are provided with pronunciation unit and control circuit inside earphone case,
Control circuit is connected with pronunciation unit, and pronunciation unit is connected with audio signal transmission wire, be provided with inside earphone case rear chamber, in
Between cavity and front cavity, rear chamber be located at earphone case top, be horizontally installed with feedforward microphone in back cavity body, make feedforward
The radio reception of microphone is faced upwards or downwards, feedforward microphone is connected to control circuit by audio signal transmission wire, and front
Offer, on corresponding earphone case, the feedforward turned on feedforward microphone above feedback microphone and connect sound mouth, while in rear chamber pair
The earphone case that answers is provided with the back cavity passage with rear chamber conducting, and front cavity is located at the bottom of earphone case, in ante-chamber body
Form sound tube road, the bottom of front cavity is the sound mouth for spreading out of sound, middle chamber be located at rear chamber and front cavity it
Between, pronunciation unit is transversely mounted in middle chamber, the sound mouth for making the pronunciation of pronunciation unit face down against front cavity, and which is special
Levy and be：Be additionally provided with the earphone case with front cavity conducting ante-chamber passage, ante-chamber passage by venting channels with
Front cavity is turned on, and ante-chamber passage is located at and is connect on the identical earphone case of sound mouth direction with feedforward, and the axis of ante-chamber passage
The angle that line and feedforward are connect between the axis of sound mouth is less than 90 degree.
In described above, as preferred scheme, the ante-chamber passage is located at the relative back of the body in face that pronounces of pronunciation unit
On earphone case above face.
In described above, as preferred scheme, rear feed microphone is installed in the ante-chamber body, rear feed microphone is located at
The lower section of pronunciation unit, rear feed microphone are connected to control circuit by audio signal transmission wire, and rear feed microphone is vertically installed
In ante-chamber body, the radio reception of rear feed microphone is made towards left or to the right, and the center vertical line of rear feed microphone is perpendicular to going out sound
The inwall of pipeline.
In described above, as preferred scheme, the control circuit include the first detecting unit, the second detecting unit,
Comparison unit, arithmetic element and sound wave output unit.
The noise audio signal of feedforward microphone collection is referred to as audio frequency one, and the noise audio signal of rear feed microphone collection claims
For audio frequency two.Audio frequency one and the difference input control circuit of audio frequency two, control circuit receive and calculate the sound of audio frequency one and audio frequency two
The Wave data of the mixed noise sound wave of ripple, and the data are transported to phonation unit.Phonation unit is carried according to control circuit
For data, produce the sound wave of, opposite in phase identical with the amplitude of noise sound wave, come automotive resistance process noise.So, send out
The sound that sound unit sends can farthest avoid the interference of ambient noise so that people can be in relatively quiet environment
Listen attentively to, and the clear sound that hears, tonequality grace.
In described above, as preferred scheme, the pronunciation unit is fidelity high pitch loud-speaker.
In described above, used as preferred scheme, the feedforward microphone gathers rightabout respectively with rear feed microphone
Noise audio signal.
In described above, as preferred scheme, it is provided with the back cavity body and blocks for installing the first of feedforward microphone
Seat, is provided with ante-chamber body for installing the second deck of rear feed microphone.
In described above, used as preferred scheme, the axis of the ante-chamber passage connects the axis of sound mouth with feedforward
It is parallel to each other.
Beneficial effect produced by the utility model is：The structure of this active noise reduction is applied to In-Ear Headphones, will be front
Chamber passage is arranged at and is connect on the identical earphone case of sound mouth direction with feedforward, and the axis of ante-chamber passage connects sound with feedforward
Angle between the axis of mouth is less than 90 degree, and compared with traditional earphone, noise is entered from ante-chamber passage, when entrance ante-chamber
, when different directions, noise enters the passage of duct can be more consistent, this special setting structure for the noise source of passage
Preferably, environmental suitability is strong for noise reduction, such as still keeps notable noise reduction effect under the especially ear-piercing environment of the noise such as airport, subway
Really, being different from traditional active noise reduction techniques can only reduce the defect of low frequency noise, and In-Ear Headphones of the present utility model can not only
Reduce high frequency noise, moreover it is possible to the actual life noise (voice such as crowd in fan sound, air-conditioning sound, subway is greatly lowered
Deng), through tight accurate test, at higher frequencies, the change of active noise reduction performance is more consistent, in addition, wave filter target exists
Amplitude under different noise directions does not have significant changes, compared with traditional structure, ante-chamber passage is designed in new position,
The wave filter target for entering the different noises of ante-chamber passage from different directions is more consistent, and this structure is applied to feedforward
Type and mixed type active noise reduction In-Ear Headphones.
Description of the drawings
Fig. 1 is the easy structure schematic diagram of existing earphone in background technology；
Fig. 2 is the change curve schematic diagram of the active noise reduction performance for receiving noise in background technology from different directions；
Fig. 3 is change curve schematic diagram of the background technology median filter target under different noise directions；
Fig. 4 is the easy structure schematic diagram of active noise reduction In-Ear Headphones in embodiment；
Fig. 5 is the profile of active noise reduction In-Ear Headphones in embodiment；
Fig. 6 is the structural decomposition diagram of active noise reduction In-Ear Headphones in embodiment；
Fig. 7 is the change of the active noise reduction performance that active noise reduction In-Ear Headphones receive noise from different directions in embodiment
Curve synoptic diagram；
Fig. 8 is that change curve of the active noise reduction In-Ear Headphones wave filter target under different noise directions shows in embodiment
It is intended to；
In Fig. 1, B1 is the first microphone, and B2 is second microphone, and B3 is pronunciation unit, and B4 is ante-chamber blow vent, and B5 is
Back cavity blow vent；In Fig. 4～Fig. 6,1 is upper shell, and 2 is lower house, and 3 is pronunciation unit, and 4 is feedforward microphone, and 5 is logical for back cavity
Pore, 6 is rear feed microphone, and 7 is ante-chamber passage, and 8 is venting channels, and 9 connect sound mouth for feedforward.
Specific embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
The present embodiment, with reference to Fig. 4～Fig. 8, the active noise reduction In-Ear Headphones which is embodied as include earphone case, this reality
The earphone case for applying example includes that upper shell 1 and lower house 2, upper shell 1 carry out pairing fastening with lower house 2 and form, such as Fig. 4～6
Shown, pronunciation unit 3 and control circuit are installed inside earphone case（Not shown）, the pronunciation unit 3 of the present embodiment is fidelity
High pitch loud-speaker, control circuit are connected with pronunciation unit 3, and pronunciation unit 3 is connected with audio signal transmission wire（Not shown）, ear casing
Portion is provided with rear chamber, middle chamber and front cavity in vivo, and rear chamber is located at the top of earphone case, is transversely mounted in back cavity body
There is feedforward microphone 4, the radio reception of feedforward microphone 4 is faced upwards or downwards, feedforward microphone 4 passes through audio signal transmission wire
Control circuit is connected to, is provided with back cavity body for installing the first deck of feedforward microphone 4, and above feedforward microphone 4
The feedforward turned on feedforward microphone 4 is offered on corresponding earphone case and connects sound mouth 9, while in the corresponding ear casing of rear chamber
Body is provided with the back cavity passage 5 with rear chamber conducting.
Front cavity is located at the bottom of earphone case, forms sound tube road in ante-chamber body, and the bottom of front cavity is for spreading out of
The sound mouth of sound, is provided with rear feed microphone 6 in ante-chamber body, rear feed microphone 6 is located at the lower section of pronunciation unit 3, rear feed wheat
Gram wind 6 is connected to control circuit by audio signal transmission wire, is provided with for installing the second card of rear feed microphone 6 in ante-chamber body
Seat, in the present embodiment, rear feed microphone 6 is mounted vertically in ante-chamber body, make the radio reception of rear feed microphone 6 towards left or to
The right side, and the center vertical line of rear feed microphone 6 is perpendicular to the inwall in sound tube road.
Middle chamber is located between rear chamber and front cavity, and pronunciation unit 3 is transversely mounted in middle chamber, makes pronunciation list
The sound mouth that the pronunciation of unit 3 faces down against front cavity, and rear feed microphone 6 is located at the lower section of pronunciation unit 3, on earphone case
The ante-chamber passage 7 with front cavity conducting is additionally provided with, ante-chamber passage 7 is turned on front cavity by venting channels 8, makes rear feed wheat
Gram wind 6 can receive the noise of the different directions incoming by ante-chamber passage 7, and ante-chamber passage 7 is located at and meets 5 side of sound mouth with feedforward
To on identical earphone case, and the angle that the axis of ante-chamber passage 7 and feedforward are connect between the axis of sound mouth 5 is less than 90
Degree, in the present embodiment, ante-chamber passage 7 is located on the earphone case of the relative back side in face of pronouncing of pronunciation unit 3, and front
The axis that the axis of chamber passage 7 connects sound mouth 5 with feedforward is parallel to each other, when axis and the feedforward of ante-chamber passage 7 connect
When the axis of sound mouth 5 is parallel to each other, its active noise reduction effect is optimal.
Through tight accurate test, as shown in fig. 7, in the utility model, ante-chamber passage 7 being arranged at and connecing sound with feedforward
On 5 direction identical earphone cases of mouth, and the axis of ante-chamber passage 7 and feedforward connect the angle between the axis of sound mouth 5
90 degree are less than, during Fig. 7 is shown, solid line is designated as the active noise reduction performance chart of the noise entered from front direction, thicker
Dotted line is designated as the active noise reduction performance chart of the noise for entering from the side, and thinner dotted line is designated as from posterior direction
The active noise reduction performance chart of the noise of entrance, when noise source is in different directions, noise enters the passage of duct can be more
Plus it is consistent（Relative to feedforward active noise reduction microphone position）, at higher frequencies, the change of active noise reduction performance is more consistent,
And under the frequency higher than 800Hz, then have more than the change of 10dB.
As shown in figure 8, give change curve of the figure median filter target under different noise directions after tested, due to
Wave filter target is plural number, so using amplitude（Upper figure）And phase place（Figure below）Two graph expressions, in figure, solid line is designated as wave filter mesh
From the noise variation curve map for above entering, it is bent from the noise variation that side enters that thicker dotted line is designated as wave filter target to mark
Line chart, thinner dotted line are designated as wave filter target from the noise variation curve map for entering below, and in figure, wave filter target is not
There is no significant changes with the amplitude under noise direction（It is less than 3KHz）, compared with traditional front blow vent, using new design
During the ante-chamber passage 7 of position, the wave filter target under different noise directions is more consistent.Wave filter target is set for wave filter
Meter target or optimal target, this target can be with the direction change of noise, and this change is fewer, and anti-acoustic capability is more fixed, more
Less by the aspect effect of noise.
Above content is with reference to specific preferred embodiment further detailed description of the utility model, it is impossible to recognize
Fixed of the present utility model it is embodied as being confined to these explanations.Ordinary skill people for the utility model art
For member, without departing from the concept of the premise utility, some simple deduction or replace can also be made, be regarded as this
The protection domain of utility model.
Claims (8)
1. active noise reduction In-Ear Headphones, including earphone case, are provided with pronunciation unit and control circuit inside earphone case, control
Circuit processed is connected with pronunciation unit, and pronunciation unit is connected with audio signal transmission wire, is provided with rear chamber, centre inside earphone case
Cavity and front cavity, rear chamber are located at the top of earphone case, be horizontally installed with feedforward microphone, make feedforward wheat in back cavity body
The radio reception of gram wind is faced upwards or downwards, feedforward microphone is connected to control circuit by audio signal transmission wire, and in feedforward
The feedforward turned on feedforward microphone is offered above microphone on corresponding earphone case and connects sound mouth, while corresponding in rear chamber
Earphone case be provided with rear chamber conducting back cavity passage, front cavity be located at earphone case bottom, shape in ante-chamber body
Into sound tube road, the bottom of front cavity is the sound mouth for spreading out of sound, and middle chamber is located between rear chamber and front cavity,
Pronunciation unit is transversely mounted in middle chamber, the sound mouth for making the pronunciation of pronunciation unit face down against front cavity, its feature
It is：Be additionally provided with the earphone case with front cavity conducting ante-chamber passage, ante-chamber passage by venting channels with front
Cavity is turned on, and ante-chamber passage is located at and is connect on the identical earphone case of sound mouth direction with feedforward, and the axis of ante-chamber passage
The angle connect with feedforward between the axis of sound mouth is less than 90 degree.
2. active noise reduction In-Ear Headphones according to claim 1, it is characterised in that：It is single that the ante-chamber passage is located at pronunciation
On the earphone case of the relative back side in face of pronouncing of unit.
3. active noise reduction In-Ear Headphones according to claims 1 or 2, it is characterised in that：It is provided with the ante-chamber body
Rear feed microphone, rear feed microphone are located at the lower section of pronunciation unit, and rear feed microphone is connected to control by audio signal transmission wire
Circuit processed, rear feed microphone are mounted vertically in ante-chamber body, make the radio reception of rear feed microphone towards left or to the right, and rear feed wheat
Inwall of the center vertical line of gram wind perpendicular to sound tube road.
4. active noise reduction In-Ear Headphones according to claims 1 or 2, it is characterised in that：The control circuit includes
One detecting unit, the second detecting unit, comparison unit, arithmetic element and sound wave output unit.
5. active noise reduction In-Ear Headphones according to claim 4, it is characterised in that：The pronunciation unit is coughed for fidelity high pitch
?.
6. active noise reduction In-Ear Headphones according to claims 1 or 2 or 5, it is characterised in that：The feedforward microphone
Rightabout noise audio signal is gathered respectively with rear feed microphone.
7. active noise reduction In-Ear Headphones according to claims 1 or 2 or 5, it is characterised in that：Set in the back cavity body
Have for installing the first deck of feedforward microphone, be provided with ante-chamber body for installing the second deck of rear feed microphone.
8. active noise reduction In-Ear Headphones according to claims 1 or 2 or 5, it is characterised in that：The ante-chamber passage
Axis connect the axis of sound mouth with feedforward and be parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620882842.9U CN206024053U (en) | 2016-08-15 | 2016-08-15 | Active noise reduction In-Ear Headphones |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620882842.9U CN206024053U (en) | 2016-08-15 | 2016-08-15 | Active noise reduction In-Ear Headphones |
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| CN201620882842.9U Active CN206024053U (en) | 2016-08-15 | 2016-08-15 | Active noise reduction In-Ear Headphones |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454576A (en) * | 2016-08-15 | 2017-02-22 | 富士高实业有限公司 | Active noise reduction in-ear type earphone |
| US20200090636A1 (en) * | 2018-09-18 | 2020-03-19 | Cotron Corporation | In-ear microphone with active noise control |
| TWI702855B (en) * | 2018-11-20 | 2020-08-21 | 財團法人金屬工業研究發展中心 | Active noise reduction device with sound filter and earphone |
| US20210295815A1 (en) * | 2018-08-03 | 2021-09-23 | Sony Corporation | Sound output device |
-
2016
- 2016-08-15 CN CN201620882842.9U patent/CN206024053U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106454576A (en) * | 2016-08-15 | 2017-02-22 | 富士高实业有限公司 | Active noise reduction in-ear type earphone |
| US20210295815A1 (en) * | 2018-08-03 | 2021-09-23 | Sony Corporation | Sound output device |
| US11664006B2 (en) * | 2018-08-03 | 2023-05-30 | Sony Corporation | Sound output device |
| US20200090636A1 (en) * | 2018-09-18 | 2020-03-19 | Cotron Corporation | In-ear microphone with active noise control |
| CN110913293A (en) * | 2018-09-18 | 2020-03-24 | 固昌通讯股份有限公司 | Active noise-proof type in-ear microphone |
| US10748522B2 (en) | 2018-09-18 | 2020-08-18 | Cotron Corporation | In-ear microphone with active noise control |
| TWI702855B (en) * | 2018-11-20 | 2020-08-21 | 財團法人金屬工業研究發展中心 | Active noise reduction device with sound filter and earphone |
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