CN108566590A - A kind of active noise reduction examination earphone - Google Patents
A kind of active noise reduction examination earphone Download PDFInfo
- Publication number
- CN108566590A CN108566590A CN201810750192.6A CN201810750192A CN108566590A CN 108566590 A CN108566590 A CN 108566590A CN 201810750192 A CN201810750192 A CN 201810750192A CN 108566590 A CN108566590 A CN 108566590A
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- module
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- usb
- noise reduction
- examination
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
Abstract
The present invention provides a kind of active noise reduction examination earphones, including at least 1 audio tweeter group, 1 noise reduction loud speaker group, switching circuit, Dolby circuit, USB module, usb audio coding and decoding module, the audio tweeter group decodes coding module with USB by USB module and connect, and is used for the broadcasting of audio file；The USB module is connect with USB decodings coding module, switching circuit respectively, and the input terminal of the switching circuit is connect with battery, and output end is connect with noise reduction electricity, USB module road；The noise reduction loud speaker group is connect with Dolby circuit, is used for the reversed sound wave of generation environment noise.The present invention promotes the playback recording quality for hearing class examination by active noise reduction and speech detection, blind source separating, improves the just and fair property that class of languages hears examination.
Description
Technical field
The invention belongs to field of examination equipment, are related to a kind of examination earphone, more particularly to a kind of active noise reduction examination earphone.
Background technology
Now, hear class examination be as speech capability means of testing it is more and more important, such as English Listening and Speaking examination exist
Proportion in college entrance examination gradually increases.In the implementation process of English Listening and Speaking examination, usually there are 30-50 examinees in each examination hall simultaneously
It takes an examination, the spacing distance between examinee is usually within 2 meters, due to hearing examination examination question and examining the requirement of business, it is easy to
There is an examinee to have an impact to being absorbed in examinee around hearing content when answering language acquisition problems and recording.
Further, since the psychological factor of examinee and operating lack of standardization and causing typing excessive noise, these noises in recording straight
It connects and affects recording quality.Therefore, recording quality and playing quality hear the fair and just particularly important of class examination for guarantee.
The technical principle of active noise reduction (ANC) is：The voice signal of same frequency opposite in phase can cancel out each other.This skill
Art has been widely used in earphone products, and user can not be obtained clear pure sound field environment by external interference.Past
Two during the last ten years, ANC is mainly appeared in high-end packet aural headphone product.But with constantly pushing away for China's college entrance examination examination reform
Into the necessity that ANC technologies are applied in English Listening and Speaking examination has been more and more obvious.
Past vicennial active noise reduction product is without exception all by lithium battery power supply, the power supply tool provided due to lithium battery
There is very pure ripple, therefore active noise reduction can obtain good effect.But during answering English exam, in order to ensure to examine
Try the continuity of earphone, it is desirable that electricity is taken from USB, and USB takes electricity can introduce external power supply ripple and will produce fluctuation.
Invention content
To solve the above problems, the present invention provides a kind of active noise reduction earphones to take an examination earphone at least, including switching circuit,
Dolby circuit, USB module, usb audio coding and decoding module, battery and at least one audio tweeter group, 1 noise reduction are raised one's voice
Device group, the audio tweeter group are connect with USB decoding coding modules, are used for the broadcasting of audio file；The USB module difference
Connect with USB decoding coding module, switching circuit, the input terminal of the switching circuit is connect with battery, output end and noise reduction it is electric,
USB module road connects；The noise reduction loud speaker group is connect with Dolby circuit, is used for the reversed sound wave of generation environment noise.
In an embodiment of the present invention, in order to ensure the electromagnetic isolation of loud speaker and microphone and the direction of microphone
Property, the audio tweeter group is located at noise reduction loud speaker group on the outside and inside of headset body.
In an embodiment of the present invention, the examination earphone further includes the first microphone group and the second microphone group, described
First microphone group is used to acquire voice signal when examinee's answer, and the second microphone group connect with Dolby circuit, is used for
Acquire examination hall ambient noise.
In an embodiment of the present invention, the audio tweeter group includes center channel speaker, preposition left speaker, the right side
Channel loudspeaker, postposition left speaker, right surround channel loudspeaker and 1 supper bass channel loudspeaker.
In an embodiment of the present invention, the Dolby circuit includes speech detection module, control unit, the first filtering mould
Block, the second filter module, the speech detection module detect the voice signal frame length and energy in input signal；
Described control unit controls the first filter module in response to the voice signal frame length and energy of speech detection module
And/or second filter module unlatching；First filter module carries out active noise reduction to input signal；The second filtering mould
Block is to including that the voice signal of more voice carries out blind source separating.
Particularly, in an embodiment of the present invention, first filter module includes generalized sidelobe canceller.
Particularly, in an embodiment of the present invention, second filter module is based on quick fixed point method to input letter
It number is handled.
In an embodiment of the present invention, the battery is lithium battery.
Beneficial effects of the present invention：
1. active noise reduction techniques are used in examination earphone by the present invention, when reducing external environmental noise and taking an examination examinee
Listen to the influence of hearing topic.
2. by being isolated to Dolby circuit and USB interface, solve the dry of ripple when ANC circuit takes electricity by USB
Disturb problem.
3. speech detection and blind source separating further improve the robustness of recording quality, reduce examinee because operating not
When or psychological factor caused by recording quality decline the case where to improve hear class examination fairness.
Description of the drawings
Fig. 1 is basic principle frame diagram in the embodiment of the present invention；
Fig. 2 is the principle framework figure that the first microphone group and the second microphone group are contained in the embodiment of the present invention；
Fig. 3 is the diagram for illustrating the examination earphone recording noise reduction process of the present invention；
Fig. 4 is the diagram for illustrating Dolby circuit internal structure and Recording Process.
Specific implementation mode
The earphone as shown in Figure 1, a kind of active noise reduction earphone is taken an examination, is raised including at least 1 audio tweeter group, 1,1 noise reduction
Sound device group 7, switching circuit 5, Dolby circuit 4, USB module 3, usb audio coding and decoding module 2, battery 6, the audio are raised one's voice
Device group 1 is connect with USB decoding coding modules, is used for the broadcasting of audio file；The USB module 3 decodes coding mould with USB respectively
Block, switching circuit 5 connect, and the input terminal of the switching circuit 5 is connect with battery 6, and output end connects with noise reduction electricity, 3 tunnel of USB module
It connects；The noise reduction loud speaker group 7 is connect with Dolby circuit 4, is used for the reversed sound wave of generation environment noise.Specifically, switch electricity
Road 5 is connected with the power contact of USB interface, switching circuit 5.Switch element in switching circuit 5 may be provided at outside headset body
Side facilitates examinee to cut and opens Dolby circuit 4.
In some embodiments of the invention, in order to ensure the electromagnetic isolation of loud speaker and microphone and the finger of microphone
Tropism, the audio tweeter group are located at noise reduction loud speaker group on the outside and inside of headset body.
As shown in Fig. 2, in an embodiment of the present invention, the examination earphone further includes that the first microphone group 81 and second passes
Sound device group 82, voice signal when the first microphone group 81 is used to acquire examinee's answer, the second microphone group 82 with
Dolby circuit 4 connects, for acquiring examination hall ambient noise.First microphone group 81, the second microphone group 82 are by including 1 or more
A microphone composition.
Fig. 3 shows the active noise reduction process of examination earphone, i.e., enrolls environmental noise, noise reduction electricity by the second microphone group 82
Road 4 is by the incoming signal processing to the second microphone 82, the output audio signal opposite with ambient noise, then passes through noise reduction
Loud speaker group 7 sends out the reversed sound wave of ambient noise.
In an embodiment of the present invention, audio tweeter group 1, which includes multiple loud speakers, can form loudspeaker array, to
Sounding effect is improved, three-dimensional sense is improved.The audio tweeter group 1 includes center channel speaker, preposition left speaker, right sound
Road loud speaker, postposition left speaker, right surround channel loudspeaker and 1 supper bass channel loudspeaker.
As shown in figure 4, in an embodiment of the present invention, the Dolby circuit 4 includes speech detection module 41, control unit
42, the first filter module 43, the second filter module 44, what the detection of speech detection module 41 was passed to by the first microphone group 81
Voice signal frame length in input signal and energy；Voice signal of the described control unit 42 in response to speech detection module
Frame length and energy or amplitude control the unlatching of the first filter module 43 and/or the second filter module 44；Particularly, control is single
42 energy automated response of member is in the voice signal of voice sound generation source：When detecting the voice sent out by non-first microphone group 81
Signal then opens the second filter module 44.
It is described first filtering 43 modules to input signal carry out active noise reduction, with reference to figure 3 or Fig. 4, input signal refer to by
The electric signal that first microphone group or the second microphone group are passed to；Second filter module 44 to include more voice voice
Signal carries out blind source separating.First filter module 43, the second filter module 44, control unit 42 may include being programmed to execute
The processor of instruction, other one or more devices, circuit, module or combinations thereof.In conjunction with algorithm shown in this article or method
Step can directly be implemented with hardware, with the combination of the software module that is executed by processor or both.
Above-mentioned speech detection module 41 is by judging the speech frame in voice signal and non-speech frame, and voice signal is to have
Color short-term stationarity signal, frequency spectrum are more concentrated, and different frequency bands deposit difference, special, in some examples of the present invention, utilize width
Degree composes the emergency degree of the variation on frequency domain to describe the difference of voice and noise, defines 1 frequency band variance to describe amplitude
Compose the variation tendency on frequency domain.
Other than distinguishing speech frame and non-speech frame in addition to the frequency band variance of above-mentioned some examples use in the present invention, by one
The power spectrum of frame signal is divided into several critical bands according to the height of frequency, and power summation is what element was constituted in each critical band
Vector becomes critical band feature vector.
In an embodiment of the present invention, first filter module 43 includes generalized sidelobe canceller (GSC).In general, GSC
Including fixed beam former, blocking matrix, adaptation module.Microphone device array signal is each after fixed beam former
Echo signal can be approximated to be in time unifying in the signal of road.
In an embodiment of the present invention, second filter module 44 is based on quick fixed point method to input signal progress
Processing.Specifically, it is based on the maximum progressive orthogonalization Fixed-Point Algorithm of kurtosis.
In the above-described embodiment, in order to preferably reduce ripple, the battery is lithium battery.The foregoing is merely this hairs
Bright preferred embodiment can not limit the present invention, all within the spirits and principles of the present invention, any modification made, etc.
With replacing, improving, should all be included in the protection scope of the present invention.
Claims (8)
- The earphone 1. a kind of active noise reduction is taken an examination, which is characterized in that compiled including switching circuit, Dolby circuit, USB module, usb audio Code decoder module, battery and at least one audio tweeter group and at least one noise reduction loud speaker group,The audio tweeter group is connect with USB decoding coding modules, is used for the broadcasting of audio file；The USB module is connect with USB decodings coding module, switching circuit respectively,The input terminal of the switching circuit is connect with battery, and output end is connect with Dolby circuit, USB module；The noise reduction loud speaker group is connect with Dolby circuit, is used for the reversed sound wave of generation environment noise.
- 2. examination earphone according to claim 1, which is characterized in that preferred, the audio tweeter group is raised with noise reduction Sound device group is located on the outside and inside of headset body.
- 3. examination earphone according to claim 1, which is characterized in that the examination earphone further include the first microphone group and Second microphone group, the first microphone group are used to acquire voice signal when examinee's answer,The second microphone group is connect with Dolby circuit, for acquiring examination hall ambient noise.
- 4. examination earphone according to claim 1, which is characterized in that the audio tweeter group includes that center channel is raised one's voice Device, preposition left speaker, right channel loudspeaker, postposition left speaker, right surround channel loudspeaker and 1 supper bass sound channel are raised Sound device.
- 5. examination earphone according to claim 1, which is characterized in that the Dolby circuit includes speech detection module, control Unit processed, the first filter module, the second filter module,Voice signal in the speech detection module detection input signal；Described control unit is in response to the frame length of the voice signal of speech detection module and the threshold value of amplitude, the first filtering of control The unlatching of module and/or the second filter module；First filter module carries out active noise reduction to input signal；Second filter module is to including that the voice signal of more voice carries out blind source separating.
- 6. examination earphone according to claim 5, which is characterized in that first filter module includes that generalized sidelobe is offset Device.
- 7. examination earphone according to claim 5, which is characterized in that second filter module is based on quick fixed point side Method handles input signal.
- 8. examination earphone according to any one of claims 1 to 7, which is characterized in that the battery is lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750192.6A CN108566590A (en) | 2018-07-09 | 2018-07-09 | A kind of active noise reduction examination earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810750192.6A CN108566590A (en) | 2018-07-09 | 2018-07-09 | A kind of active noise reduction examination earphone |
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| Publication Number | Publication Date |
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| CN108566590A true CN108566590A (en) | 2018-09-21 |
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| CN206024050U (en) * | 2016-08-11 | 2017-03-15 | 歌尔股份有限公司 | A kind of noise cancelling headphone |
| CN107396220A (en) * | 2016-05-17 | 2017-11-24 | 中兴通讯股份有限公司 | Electricity-fetching method, noise cancelling headphone and playback equipment |
| WO2018051369A2 (en) * | 2016-09-16 | 2018-03-22 | Intel Corporation | Battery-less, noise-cancellation headset |
| CN207304859U (en) * | 2017-10-18 | 2018-05-01 | 倬韵科技（深圳）有限公司 | A kind of binary channels active noise reduction earphone |
| CN207354545U (en) * | 2017-06-21 | 2018-05-11 | 张睿清 | It is a kind of to remove noise earphone with speech identifying function |
| CN208489975U (en) * | 2018-07-09 | 2019-02-12 | 广州启辰电子科技有限公司 | A kind of active noise reduction examination earphone |
-
2018
- 2018-07-09 CN CN201810750192.6A patent/CN108566590A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107396220A (en) * | 2016-05-17 | 2017-11-24 | 中兴通讯股份有限公司 | Electricity-fetching method, noise cancelling headphone and playback equipment |
| CN206024050U (en) * | 2016-08-11 | 2017-03-15 | 歌尔股份有限公司 | A kind of noise cancelling headphone |
| WO2018051369A2 (en) * | 2016-09-16 | 2018-03-22 | Intel Corporation | Battery-less, noise-cancellation headset |
| CN207354545U (en) * | 2017-06-21 | 2018-05-11 | 张睿清 | It is a kind of to remove noise earphone with speech identifying function |
| CN207304859U (en) * | 2017-10-18 | 2018-05-01 | 倬韵科技（深圳）有限公司 | A kind of binary channels active noise reduction earphone |
| CN208489975U (en) * | 2018-07-09 | 2019-02-12 | 广州启辰电子科技有限公司 | A kind of active noise reduction examination earphone |
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