CN102238452A - A method for actively anti-noise in hands-free earphones and hands-free earphones - Google Patents
A method for actively anti-noise in hands-free earphones and hands-free earphonesDownload PDFInfo
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- CN102238452A CN102238452ACN2011101155203ACN201110115520ACN102238452ACN 102238452 ACN102238452 ACN 102238452ACN 2011101155203 ACN2011101155203 ACN 2011101155203ACN 201110115520 ACN201110115520 ACN 201110115520ACN 102238452 ACN102238452 ACN 102238452A
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Abstract
Description
Technical field
The present invention relates to the Anti-noise Technique field, relate in particular to a kind of in Earphone with microphone initiatively antimierophonic method and Earphone with microphone.
Background technology
The common method and the earphone of anti-ambient noise in earphone mainly is divided into two big classes: passive type and active.Passive type is based on sound-absorbing and sound insulation; Active electronics or the additive method of then utilizing, it is anti-phase that the phase place of partial noise is made 180 degree, mixes with source noise again, and phase place is just in time opposite with the source noise amplitude is equal as the noise after anti-phase, and then noise can be cancelled fully.
The antimierophonic earphone of existing active all need be provided with a microphone on each earphone side usually, shown in Fig. 1 (In-Ear Headphones) and Fig. 2 (circumaural earphone).Among Fig. 1 and 2,100 is the ambient noise source, and 101 for leaking the ambient noise of external auditory meatus, 102 for receiving the microphone of noise, 103 is headset main body, and 104 is the loud speaker of earphone, 105 sound that send for loud speaker 104,106 is ear, 107 is mixer, and 108 is source signal, also is thatear 106 is wanted the sound heard, 109 is signal processor, comprised thatmixer 107 and noise processor 110,111 are the electric wire of microphone, transmitted microphone signal, 112 is the electric wire ofloud speaker 104, transmit loudspeaker signal, 200 is the ear-drum in the ear, with the sound of external auditory meatus, be transformed into signal, be sent to brain.
Particularly, microphone 102 has been collected theambient noise 100 of outside, it is become the signal of telecommunication, reach on thesignal processor 109 throughelectric wire 111,noise processor 110 in thesignal processor 109 with noise amplify, anti-phase, filter, postpone or do other information processings, delivering tomixer 107 again mixes withsource signal 108, source signal can be the signal that comes out from multimedia equipments such as MP3, mobile phone, multimedia player, panel computers, mixed signal is again through amplifying buffering, delivered to byelectric wire 112 in theloud speaker 104 of headsetmain body 103 and goes.Thesound 105 that sends fromloud speaker 104, propagate at external auditory meatus, throughear drum membrane 200,sound 105 has compriseduseful source signal 108 and the noise of handling throughnoise processor 110, if the amplitude of the noise section of thesound 105 that loud speaker sends equates with thenoise 101 that leaksear 106, and phase place is that 180 degree are anti-phase, and thenear drum membrane 200 can't hear theambient noise 100 of outside fully.
In the active antimierophonic earphone of this tradition, because it is less withloud speaker 104 spacings to collect themicrophone 102 of noise, makemicrophone 102 except collectingambient noise 100, collect the sound thatloud speaker 104 sends also unavoidablely, these loud parts are to be produced byuseful source signal 108, negative feedback will make source signal sound diminish in this, as phase place deviation be arranged, and also can cause distortion and produce new noise.In addition, traditional active noise reducing earphone is provided with microphone respectively on two receivers, need design especially, costs an arm and a leg, and is unfavorable for popularizing.
Summary of the invention
The technical problem to be solved in the present invention is, at in the prior art initiatively antimierophonic method and apparatus weaken source signal easily, produce new noise and defective such as cost an arm and a leg, utilize the microphone that is used for voice call in the Earphone with microphone to collect ambient noise, a kind of source signal quality, more thorough antinoise and cheap antimierophonic method of active and Earphone with microphone in Earphone with microphone of guaranteeing is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Provide a kind of in Earphone with microphone antimierophonic method initiatively, comprising:
Collect ambient noise, described collection process is used to provide the plug-in microphone of the described Earphone with microphone of function of voice communication to carry out by former, and the distance of described plug-in microphone and external auditory meatus is less than 1 meter;
Described ambient noise is carried out anti-phase processing;
Described anti-phase ambient noise is mixed with source signal from multimedia equipment.
In the antimierophonic method of active, described plug-in microphone also is used for collecting voice signal when carrying out voice communication in Earphone with microphone in the present invention.
The present invention in the antimierophonic method of active, also comprises described ambient noise is carried out processing and amplifying in Earphone with microphone.
The present invention in the antimierophonic method of active, also comprises described ambient noise is carried out filtration treatment in Earphone with microphone.
The present invention in the antimierophonic method of active, also comprises described ambient noise is postponed to handle in Earphone with microphone.
The present invention also provides a kind of active antimierophonic Earphone with microphone, comprises headset main body, also comprises:
Be used to collect the plug-in microphone of ambient noise, described plug-in microphone is former to be used to provide function of voice communication, and described plug-in microphone links to each other with described headset main body, and with the distance of external auditory meatus less than 1 meter;
Be used to handle the signal processor of described ambient noise, described signal processor comprises inverter, and described inverter is used for described ambient noise is carried out anti-phase processing; And
Be used for mixer that described anti-phase ambient noise is mixed with source signal from multimedia equipment.
In the antimierophonic Earphone with microphone of the present invention's active, described plug-in microphone also is used for collecting voice signal when carrying out voice communication.
In the antimierophonic Earphone with microphone of the present invention's active, described signal processor also comprises the buffer amplifier that is used for described ambient noise is carried out processing and amplifying.
In the antimierophonic Earphone with microphone of the present invention's active, described signal processor also comprises the frequency spectrum filter that is used for described ambient noise is carried out filtration treatment.
The present invention is initiatively in the antimierophonic Earphone with microphone, and described signal processor also comprises and is used for audio frequency delay device that described ambient noise is postponed to handle.
The present invention is initiatively in the antimierophonic Earphone with microphone, and described signal processor is integrated in the described multimedia equipment or is placed on described multimedia equipment and communicates by letter with described earphone and links to each other.
In the antimierophonic Earphone with microphone of the present invention's active, described signal processor is a Small Scale Integration.
The present invention a kind of in Earphone with microphone initiatively the beneficial effect of antimierophonic method and Earphone with microphone be: by the Earphone with microphone that uses regular handset plug-in microphone and headset main body are separated, avoid when antinoise, weakening source signal, avoid producing new noise, improved the antimierophonic ability of earphone, and be based on common mobile phone Earphone with microphone, cheap, be beneficial to universal.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of the antimierophonic In-Ear Headphones of tradition active in the prior art;
Fig. 2 is the schematic diagram of the antimierophonic circumaural earphone of tradition active in the prior art;
Fig. 3 is the block diagram of antimierophonic Earphone with microphone initiatively according to an embodiment of the invention;
Fig. 4 is the schematic diagram of antimierophonic In-Ear Headphones initiatively according to an embodiment of the invention;
Fig. 5 is the schematic diagram of antimierophonic earmuff formula Earphone with microphone initiatively according to an embodiment of the invention;
Fig. 6 is that signal processor is built in the schematic diagram of the Earphone with microphone of multimedia equipment according to an embodiment of the invention;
Fig. 7 is that signal processor is placed on the schematic diagram of the Earphone with microphone of multimedia equipment according to an embodiment of the invention;
Fig. 8 is the flow chart of antimierophonic method initiatively in Earphone with microphone according to an embodiment of the invention;
Fig. 9 is the curve chart of antimierophonic effect according to an embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 3 is the block diagram of antimierophonic Earphone with microphone initiatively according to an embodiment of the invention.In the present embodiment, the antimierophonic Earphone with microphone of a kind of active comprises headset main body 30 (comprising loud speaker and various connecting line), plug-inmicrophone 40,signal processor 50 and mixer 60.Can compriseinverter 51 in the signal processor 50.Mixer 60 can be integrated in thesignal processor 50, or placessignal processor 50 to link to each other outward and withsignal processor 50 communications.
Plug-inmicrophone 40 is used to collect ambient noise.Plug-in microphone that the present invention adopts 40 is former to be used to provide function of voice communication, for example is the plug-in microphone on the common mobile phone Earphone with microphone.Therefore, plug-inmicrophone 40 can also be used for collecting voice signal when carrying out voice communication.Plug-inmicrophone 40 links to each other withsignal processor 50, and with the distance of external auditory meatus less than 1 meter.Tradition initiatively antimierophonic earphone will be placed on the microphone of collecting noise the earphone next door as far as possible, mainly is in order to obtain the noise near external auditory meatus.Under actual environment, most noise is all than low frequency, wavelength all one meter or more than.Therefore when the distance of microphone and external auditory meatus during less than (or much smaller than) 1 meter, the phase error that is produced will be seldom, thereby can ignore.
In the course of the work, plug-inmicrophone 40 is collected ambient noise, then ambient noise is sent to signal processor 50.The ambient noise of 50 pairs of receptions of signal processor is handled.In the present embodiment, the ambient noise of the 51 pairs of receptions of inverter in thesignal processor 50 is carried out anti-phase processing (180 degree are anti-phase).Then,inverter 51 will sendmixer 60 through anti-phase ambient noise to, andmixer 60 is from continuous multimedia equipment reception sources signal simultaneously, and mixer 60 mixes anti-phase ambient noise with source signal then.Owing to equate through anti-phase ambient noise and people's ear amplitude by the ambient noise in the audio signal of external auditory meatus reception, phase place is opposite, therefore can partially or completely resist the ambient noise in the audio signal, the ear that makes the people is the audio frequency that produces of reception sources signal more clearly.
The antimierophonic Earphone with microphone of active provided by the invention separates plug-in microphone and headset main body by the Earphone with microphone that adopts regular handset, avoid when antinoise, weakening source signal, avoid producing new noise, improved the antimierophonic ability of earphone, and be based on common mobile phone Earphone with microphone, cheap, be beneficial to universal.
Fig. 4 is the schematic diagram of antimierophonic In-Ear Earphone with microphone initiatively according to an embodiment of the invention.Fig. 5 is the schematic diagram of antimierophonic earmuff formula Earphone with microphone initiatively according to an embodiment of the invention.In these embodiments, initiatively antimierophonic Earphone with microphone comprises headsetmain body 203, plug-inmicrophone 202,signal processor 209 and mixer 207.Wherein, headsetmain body 203, plug-inmicrophone 202 andmixer 207 are same or similar with headsetmain body 30, plug-inmicrophone 40 and themixer 60 described with reference to figure 3 respectively.Although the mixer shown in the Figure 4 and 5 207 is arranged insignal processor 209, this only is used to illustrate, and is not used in restriction, and in other embodiments of the invention,mixer 207 can also place outside thesignal processor 209, for example in the headset main body 203.In Figure 4 and 5,204 is the loud speaker in the headset main body 203,208,211,212 respectively with Fig. 1 and 2 in 108,111,112 identical.
In Fig. 4 and embodiment shown in Figure 5,signal processor 209 also comprisesbuffer amplifier 210A except comprising inverter210B.Buffer amplifier 210A can be used for the ambient noise that plug-inmicrophone 202 is collected is carried out suitably processing and amplifying, so that cooperate the microphone of different sensitivity, reaches best antinoise effect.
In other embodiments of the invention,signal processor 209 can also comprise the frequency spectrum filter.The frequency spectrum filter can be used for the ambient noise that plug-inmicrophone 202 is collected is carried out suitably filtration treatment, with the anti-noise degree of control to different spectral.For example, the frequency spectrum filter can suitably reduce even eliminate middle and high frequency ambient noise, only keeps the low frequency environments noise.Because middle and high frequency ambient noise is warning signal sound or other urgent signal mostly, moderate reduction or keep this class ambient noise fully and can avoid the user to ignore warning signal sound or other urgent signal and influence safety of outside.
In other embodiments of the invention,signal processor 209 can also comprise the audio frequency delay device.The audio frequency delay device can be used for the ambient noise that plug-in microphone is collected is suitably postponed to handle, and reducing or to eliminate because the delay that the processing noise produces, thereby reaches the anti-noise effect of the best.
In other embodiments of the invention,signal processor 209 can be a Small Scale Integration, except inverter, it can also comprise in buffer, frequency spectrum filter and the audio frequency delay device any one and/or multiple combination, and order or the mode according to any appropriate connects between them.In the active antimierophonic earphone of tradition, except microphone being contained on each earphone, itssignal processor 109 generally all uses discrete analog processor (Discrete Analogue Signal Processing Module) or expensive digital processing unit (Digital Signal Processing Module), these two kinds of processors all have the shortcoming that volume is big and power consumption is many, are unfavorable for using on portable set.Therefore, initiatively antimierophonic earphone is all expensive and not universal for this tradition.In some embodiments of the invention, the signal processor that adopts Small Scale Integration to make is placed on the inside or the outside of mobile phone, MP3, multimedia player, panel computer etc., and the machine external connection can be constant fully.If this integrated circuit is an analog integrated circuit, volume and power consumption can be very little, thereby can save cost.This integrated circuit is 201010265288.7 at application number, be entitled as in the patent application of " a kind of earphone and drive circuit thereof of eliminating noise " and have a detailed description, and this paper all includes it in reference.
If the antimierophonic Earphone with microphone of above-mentioned active is used in mobile phone or the voice communication apparatus,signal processor 209 will be handled noise and useful voice signal simultaneously, when the user uses plug-inmicrophone 202 to talk, undressed signal, to directly deliver to mobile phone or othervoice communication apparatus 213 bybuffer 210A, pass to the recipient in a distant place again.Buffer 210A also delivers to the signal of plug-inmicrophone collection inverter 210B or frequency spectrum filter, audio frequency delay device, after amplification after filtration,, delay, the information processing such as anti-phase, mix with thesource signal 208 in mobile phone or the voice communication apparatus, deliver in theloud speaker 204 of earphone.In the above-described embodiments, the frequency spectrum filter need filter plug-inmicrophone 202 collected higher frequency spectrum (comprising the speech frequency spectrum) as far as possible.
Fig. 6 is that signal processor is built in the schematic diagram of the Earphone with microphone of multimedia equipment according to an embodiment of the invention.As shown in the figure, 303 is the In-Ear Headphones main body, 302 is plug-in microphone, 350 is that the earphone of headsetmain body 303 is inserted, 351 insert four in 350 for earphone saves plugs, 324A is connected with plug-inmicrophone main body 303 respectively, and 321A is common wiring.300 is the multimedia equipment (for example multimedia handset) of the common In-Ear Earphone with microphone of use, 300A is the multimedia equipment that is built-in with signal processor, 352 is earphone socket, 321,322,323 and 324 directly (in 300) or be connected with 321A, 322A, 323A and 324A by signal processor 309 (in 300A) indirectly respectively.In thesignal processor 309 307,310A and 310B are same or similar with 207 shown in the Figure 4 and 5,210A and 210B respectively.
In the present embodiment, 300,300A can be multimedia equipments such as mobile phone, MP3, multimedia player, panel computer, 303 can be In-Ear Earphone with microphone or earmuff formula Earphone with microphone main body, this headset main body is inserted 350 by one four joint earphone and is received on the multimedia equipment,microphone 302 not only can be made conversation usefulness when mobile phone communication, can also be used for the reception environment noise simultaneously.Earphone inserts 350 one fourjoint plug 351, and wherein two joints are left and rightacoustic channels microphone 324A, a joint iscommon wiring 321A, but also ground connection of 321A.This four joints plug also can be used in the combination of other left and right acoustic channels, microphone and ground connection.
When not having built-insignal processor 309, headsetmain body 303 is inserted 350 by four joint earphones and is received in 300 thesocket 352, makes the usefulness of Earphone with microphone.When built-insignal processor 309, headsetmain body 303 also is to be inserted on the four joint earphone sockets 352.But 322A at this moment, 323A and 324A then receive on thesignal processor 309,buffer 310A with microphone signal send to respectively 324 and 310B in, the 324th, the microphone signal passage for mobile phone or panel computer use need not use in MP3 and multimedia player.310B is with the ambient noise that 310A sends anti-phase information processings such as (can also filter before anti-phase, amplify and/or) delays, and delivering to mixer 307 again mixes with the left and right acoustic channels source signal, is sent to headsetmain body 303 through earphone socket 352.In the present embodiment, the power supply thatsignal processor 309 can shared multimedia equipment.
Fig. 7 is that signal processor is placed on the schematic diagram of the Earphone with microphone of multimedia equipment according to an embodiment of the invention.In the embodiment shown in fig. 7, exceptsignal processor 309 is placed onmultimedia equipment 300 and needs the independent current source, other parts are roughly the same with Earphone with microphone as shown in Figure 6.As shown in Figure 7,300B is an external annex, and independentcurrent source 340 andsignal processor 309 placeexternal annex multimedia equipment 300 are communicated to connect.
In the embodiment shown in fig. 7,signal processor 309 is driven by independentcurrent source signal processor 309 is identical with the described method of any embodiment among Fig. 3-6.Wherein,signal processor 309 is connected withheadset plug 350 bysocket 352, also is connected with theearphone socket 352 ofmultimedia equipment 300 by plug 350A.In the present embodiment, between headsetmain body 303 and signal processor annex 300B and the connected mode of 300 of signal processor annex 300B and multimedia equipments identical.In addition, because the sensitivity of microphone of each Earphone with microphone brand is all different, so the magnification ratio ofbuffer 310A is preferably adjustable, to obtain best anti-noise effect.
Though Fig. 6 and embodiment shown in Figure 7 are the active anti-noise earphone based on the mobile phone Earphone with microphone, the present invention is not limited to based on the hands-free headsets earphone, can also be based on the earphone with plug-in microphone of any appropriate.In addition, in other embodiments of the invention, can also use other connected mode, for example USB plug and female type are inserted and be not limited only to four joint earphones.And, between headsetmain body 303 and signal processor annex 300B and the connected mode of 300 of signal processor annex 300B and multimedia equipments can be different.
Fig. 8 is the flow chart of antimierophonic method initiatively in Earphone with microphone according to an embodiment of the invention.In the present embodiment, in Earphone with microphone antimierophonic method from step S1.In step S1, collect ambient noise, collection process is carried out by the plug-in microphone of this Earphone with microphone, and this plug-in microphone is former to be used to provide function of voice communication, for example be the plug-in microphone of regular handset Earphone with microphone, the distance of this plug-in microphone and external auditory meatus is less than 1 meter.In step S2, the ambient noise of collecting is carried out anti-phase processing.In step S3, will mix with source signal through the ambient noise of anti-phase processing from multimedia equipment.Owing to equate through anti-phase ambient noise and people's ear amplitude by the ambient noise in the audio signal of external auditory meatus reception, phase place is opposite, therefore can partially or completely offset the ambient noise in the audio signal, the ear that makes the people is the audio frequency that produces of reception sources signal more clearly.
Provided by the invention in Earphone with microphone initiatively antimierophonic method by using Earphone with microphone plug-in microphone and headset main body are separated, when having avoided antinoise source signal is had a negative impact, and avoid producing new noise, improved the antimierophonic ability of earphone.
In other embodiments of the invention, can also carry out suitably processing and amplifying,, reach best antinoise effect so that cooperate the microphone of different sensitivity to the ambient noise of collecting.
In other embodiments of the invention, can also carry out suitably filtration treatment, with the anti-noise degree of control to different spectral to the ambient noise of collecting.For example, can suitably reduce even eliminate middle and high frequency ambient noise, only keep the low frequency environments noise.Because middle and high frequency ambient noise is warning signal sound or other urgent signal mostly, moderate reduction or keep this class ambient noise fully and can avoid the user to ignore warning signal sound or other urgent signal and influence safety of outside.
In other embodiments of the invention, can also suitably postpone the ambient noise of collecting to handle, reducing or to eliminate because the delay that the processing noise produces, thereby reach the anti-noise effect of the best.
Fig. 9 is the curve chart of antimierophonic effect according to an embodiment of the invention.As can be seen from Figure 9, earphone provided by the invention is not opened initiatively (being ANC OFF) before the anti-noise signal processor, because shielding also can appropriateness reduce ambient noise, but after opening active anti-noise signal processor (being ANC ON), ambient noise further can be reduced 10dB, thereby obviously suppress even eliminate ambient noise.
In some embodiments of the invention, can utilize the plug-in microphone on the common mobile phone Earphone with microphone to collect ambient noise, by filtering, postponing, appropriate signals such as amplification are handled and the phase place reversing, mix with source signal again, be sent to earphone, cancel each other, ambient noise is reduced significantly with the ambient noise of leaking external auditory meatus.Make to reach earphone in this way, when having avoided antinoise source signal is had a negative impact, and avoid producing new noise, improved the antimierophonic ability of earphone.In addition, can also avoid using traditional special and expensive active anti-noise earphone.And this method and earphone can be used for mobile phone, phone, MP3, broadcast receiver, video camera, DVD player, laptop computer, panel computer, the Internet and broadcast equipment; multimedia play equipment, deaf-aid set and other need use in the communication and playback equipment of earphone, also can be used for protecting in the industrial earphone of the sense of hearing.
Though the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, at particular condition or material, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (12)
1. the antimierophonic method of active in Earphone with microphone is characterized in that, comprising:
Collect ambient noise, described collection process is used to provide the plug-in microphone of the described Earphone with microphone of function of voice communication to carry out by former, and the distance of described plug-in microphone and external auditory meatus is less than 1 meter;
Described ambient noise is carried out anti-phase processing;
Described anti-phase ambient noise is mixed with source signal from multimedia equipment.
2. according to claim 1 in Earphone with microphone antimierophonic method initiatively, it is characterized in that described plug-in microphone also is used for collecting voice signal when carrying out voice communication.
3. according to claim 1 in Earphone with microphone antimierophonic method initiatively, it is characterized in that, also comprise described ambient noise carried out processing and amplifying.
4. according to claim 1 in Earphone with microphone antimierophonic method initiatively, it is characterized in that, also comprise described ambient noise carried out filtration treatment.
5. according to claim 1 in Earphone with microphone antimierophonic method initiatively, it is characterized in that, also comprise described ambient noise is postponed to handle.
6. the antimierophonic Earphone with microphone of active comprises headset main body, it is characterized in that, also comprises:
Be used to collect the plug-in microphone of ambient noise, described plug-in microphone is former to be used to provide function of voice communication, and described plug-in microphone links to each other with described headset main body, and with the distance of external auditory meatus less than 1 meter;
Be used to handle the signal processor of described ambient noise, described signal processor comprises inverter, and described inverter is used for described ambient noise is carried out anti-phase processing; And
Be used for mixer that described anti-phase ambient noise is mixed with source signal from multimedia equipment.
7. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that, described plug-in microphone also is used for collecting voice signal when carrying out voice communication.
8. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that described signal processor also comprises the buffer amplifier that is used for described ambient noise is carried out processing and amplifying.
9. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that described signal processor also comprises the frequency spectrum filter that is used for described ambient noise is carried out filtration treatment.
10. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that, described signal processor also comprises and is used for audio frequency delay device that described ambient noise is postponed to handle.
11. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that, described signal processor is integrated in the described multimedia equipment or is placed on described multimedia equipment and communicates by letter with described earphone and links to each other.
12. the antimierophonic Earphone with microphone of active according to claim 6 is characterized in that described signal processor is a Small Scale Integration.
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| CN103051774A (en)* | 2011-10-14 | 2013-04-17 | 浪潮乐金数字移动通信有限公司 | Mobile terminal based on multi-unit loudspeaker |
| CN103489452A (en)* | 2013-09-24 | 2014-01-01 | 小米科技有限责任公司 | Method and device for eliminating call noise and terminal device |
| CN104184886A (en)* | 2014-07-21 | 2014-12-03 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN104254026A (en)* | 2013-06-28 | 2014-12-31 | 胜德国际研发股份有限公司 | Earphone transmission line and connecting terminal thereof |
| CN104602162A (en)* | 2014-12-17 | 2015-05-06 | 惠州Tcl移动通信有限公司 | External noise reduction device for mobile terminal and noise reduction method of external noise reduction device |
| CN105120389A (en)* | 2015-08-17 | 2015-12-02 | 惠州Tcl移动通信有限公司 | A method and earphone for carrying out noise reduction processing according to scenes |
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| CN103051774B (en)* | 2011-10-14 | 2016-12-14 | 浪潮乐金数字移动通信有限公司 | A kind of mobile terminal based on multi-unit loudspeaker |
| CN106308812A (en)* | 2015-07-08 | 2017-01-11 | 宣威科技股份有限公司 | Portable hearing detection device |
| CN107333196A (en)* | 2016-04-29 | 2017-11-07 | 北京小米移动软件有限公司 | Conversion equipment and ear speaker device |
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| CN201319656Y (en)* | 2008-08-06 | 2009-09-30 | 深圳沛嘉科技有限公司 | Headphone |
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| CN105120389A (en)* | 2015-08-17 | 2015-12-02 | 惠州Tcl移动通信有限公司 | A method and earphone for carrying out noise reduction processing according to scenes |
| CN105120389B (en)* | 2015-08-17 | 2019-07-12 | 惠州Tcl移动通信有限公司 | A kind of method and earphone carrying out noise reduction process according to scene |
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| CN113497849A (en)* | 2020-03-20 | 2021-10-12 | 华为技术有限公司 | Sound masking method and device and terminal equipment |
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