CN105872884B - Earphone, the downlink Dolby circuit of earphone and method - Google Patents
Earphone, the downlink Dolby circuit of earphone and method Download PDFInfo
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- CN105872884B CN105872884B CN201610353164.1A CN201610353164A CN105872884B CN 105872884 B CN105872884 B CN 105872884B CN 201610353164 A CN201610353164 A CN 201610353164A CN 105872884 B CN105872884 B CN 105872884B
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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
- H04R1/1083—Reduction of ambient noise
Abstract
The invention discloses a kind of earphone and its downlink Dolby circuit and method, the downlink Dolby circuit of the earphone includes: environmental noise detection circuit, for receive circuit receive external audio signal when, the noise signal of test earphone external environment；Frequency range determines circuit, and the noise signal for being detected according to environmental noise detection circuit determines tonal range locating for the noise of earphone external environment；Control circuit, for determining tonal range locating for the noise of earphone external environment that circuit determines according to frequency range, the first audio amplifier circuit of control amplifies processing to the audio signal of respective audio frequency range in the received external audio signal of circuit is received.The present invention realizes the purpose of earphone signal downlink noise reduction, so that user can clearly catch out the audio content for the content either external equipment input that partner is spoken in the noisy environment of different frequency range.
Description
Technical field
The present invention relates to ear phone technology field more particularly to a kind of earphones, the downlink Dolby circuit of earphone and method.
Background technique
Earphone noise reduction is divided into two class of uplink noise reduction and downlink noise reduction, and the purpose of uplink noise reduction is to make to can catch me
One's voice in speech, the purpose of downlink noise reduction are to make the sound that I can catch other side or earphone issues.Traditional downlink noise reduction
Method eliminates external noise mainly by the way of stifled.But current most of small earbud headphone, such as bluetooth traffic type ear
Machine and various wired small headsets, are limited by space structure, are extremely difficult to the sealing requirements of above-mentioned downlink noise reduction, therefore, tradition
Earphone downlink noise-reduction method effect it is poor.
Summary of the invention
The main purpose of the present invention is to provide a kind of downlink Dolby circuits of earphone, it is intended to improve earphone downlink noise reduction
Effect.
To achieve the above object, the present invention proposes that a kind of downlink Dolby circuit of earphone, the earphone include outer for receiving
The reception circuit of portion's audio signal and for amplifying and exporting to received external audio signal to the first audio of loudspeaker
Amplifying circuit；The downlink Dolby circuit of the earphone includes:
Environmental noise detection circuit, for when the reception circuit receives external audio signal, outside test earphone
The noise signal of environment；
Frequency range determines circuit, and the noise signal for being detected according to the environmental noise detection circuit determines the ear
Tonal range locating for the noise of machine external environment；
Control circuit, for according to the frequency range determine circuit determine the earphone external environment noise locating for sound
Frequent section controls first audio amplifier circuit to respective audio frequency range in the received external audio signal of the reception circuit
Audio signal amplify processing.
Preferably, the earphone further includes for the amplified audio signal of first audio amplifier circuit to be carried out two
Stage gain is amplified and is exported to the second audio amplifier circuit of the loudspeaker；The control circuit is also used to according to the environment
The noise level for the earphone external environment that noise measuring circuit detects, accordingly controls second audio amplifier circuit pair
The amplified audio signal of first audio amplifier circuit carries out the amplification of full range section audio.
Preferably, the downlink Dolby circuit of the earphone further include: for being detected to the environmental noise detection circuit
Noise signal amplify the first signal amplification circuit of processing.
Preferably, the downlink Dolby circuit of the earphone further includes for making an uproar to the first signal amplification circuit output
The filter circuit that sound signal is filtered.
Preferably, the filter circuit includes for inputting the signal input part of noise measuring signal, for exporting filtering
Signal output end, low-pass filter unit, bandpass filtering unit and the high pass filter unit of noise measuring signal afterwards, the low pass
The input terminal of filter unit, bandpass filtering unit and high pass filter unit is connect with the signal input part, the low-pass filtering
The output end of unit, bandpass filtering unit and high pass filter unit passes through a control switch respectively and the signal output end connects
It connects；The control switch of the low-pass filter unit, the control switch of the bandpass filtering unit and the high pass filter unit
Control switch is connect with the control circuit respectively.
Preferably, human body voice collecting circuit, for when receiving external audio signal, acquiring the earphone user
Call voice, and export corresponding voice signal；
Signal inversion circuit, for being superimposed to the environmental noise detection electricity after the voice signal is carried out reverse process
On the noise signal of road detection output.
The present invention also proposes a kind of earphone, which includes the downlink Dolby circuit of earphone as described above, for receiving
The reception circuit of external audio signal and for amplifying and exporting to received external audio signal to the first sound of loudspeaker
Frequency amplifying circuit；The downlink Dolby circuit of the earphone includes: environmental noise detection circuit, for receiving in the reception circuit
When to external audio signal, the noise signal of test earphone external environment；Frequency range determines circuit, for according to the environmental noise
The noise signal that detection circuit detects determines tonal range locating for the noise of the earphone external environment；Control circuit is used
The tonal range locating for the noise for determining the determining earphone external environment of circuit according to the frequency range, control described first
Audio amplifier circuit amplifies the audio signal of respective audio frequency range in the reception received external audio signal of circuit
Processing.
In addition, the present invention also proposes a kind of downlink noise-reduction method of earphone, this method comprises:
When receiving external audio signal, the noise of test earphone external environment；
According to the noise signal detected, tonal range locating for the noise of the earphone external environment is determined；
According to tonal range locating for the noise of the identified earphone external environment, in the external audio signal
The audio signal of respective audio frequency range amplifies processing.
Preferably, tonal range locating for the noise of the earphone external environment described according to determined by, to described outer
The audio signal of respective audio frequency range amplifies processing and specifically includes in portion's audio signal:
When the duration of the noise of the earphone external environment confirmly detected being greater than preset threshold, then according to institute
Tonal range locating for the noise of the determining earphone external environment, to respective audio frequency range in the external audio signal
Audio signal amplifies processing.
Preferably, the downlink noise-reduction method of the earphone further include:
When receiving external audio signal, the call voice of the earphone user is acquired, and exports corresponding voice
Signal；
The noise signal of the earphone external environment detected will be superimposed to after voice signal progress reverse process
On.
The present invention by setting for when the reception circuit receives external audio signal, test earphone external environment
The environmental noise detection circuit of noise signal, the noise signal for being detected according to the environmental noise detection circuit, really
The frequency range of tonal range locating for the noise of the fixed earphone external environment determines circuit and for being determined according to the frequency range
Tonal range locating for the noise for the earphone external environment that circuit determines controls first audio amplifier circuit to described
The audio signal for receiving respective audio frequency range in the received external audio signal of circuit amplifies the control circuit of processing, so that
With noise with the reinforced partly of frequency range in the voice signal of earphone horn output so that in the voice signal of earphone horn output with
Noise makes user in different frequency range with the reinforced partly of frequency range to improve the clarity of earphone horn output sound
The audio content for the content either external equipment input that partner is spoken can be clearly caught out in noisy environment, this
Sample just improves the effect of downlink noise reduction.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is that the downlink Dolby circuit of earphone of the present invention is applied to the functional block diagram in earphone；
Fig. 2 is the electrical block diagram of one embodiment of filter circuit of the present invention；
Fig. 3 is that external noise of the present invention detects loudness contour；
Fig. 4 is the flow diagram of the downlink noise-reduction method first embodiment of earphone of the present invention；
Fig. 5 is the flow diagram of the downlink noise-reduction method second embodiment of earphone of the present invention；
Fig. 6 is the flow diagram of the downlink noise-reduction method 3rd embodiment of earphone of the present invention；
Fig. 7 is the flow diagram of the downlink noise-reduction method fourth embodiment of earphone of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art under that premise of not paying creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot understand
For its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the technical side between each embodiment
Case can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solution
Conflicting or cannot achieve when occur will be understood that the combination of this technical solution is not present, also not the present invention claims guarantor
Within the scope of shield.
The present invention proposes a kind of earphone and its downlink Dolby circuit and method.
As shown in Figure 1, earphone of the present invention includes receiving circuit 101, the first audio amplifier circuit 102 and the amplification of the second audio
Circuit 103, wherein receive circuit 101 for receiving external audio signal；First audio amplifier circuit 102 is used for received
External audio signal amplifies；Second audio amplifier circuit 103 is used for first audio amplifier circuit 102 is amplified
Audio signal carries out two stage gain amplifications and exports to loudspeaker to play.
Also, earphone of the present invention further includes the downlink Dolby circuit of earphone, for carrying out downlink noise reduction to earphone, using
It is defeated that person can clearly catch out the content either external equipment that partner is spoken in the noisy environment of different frequency range
The audio content entered.
Referring especially to Fig. 1, in an embodiment of the present invention, the downlink Dolby circuit of the earphone includes:
Environmental noise detection circuit 10, for when the reception circuit 101 receives external audio signal, test earphone
The noise signal of external environment；Environmental noise detection circuit 10 can realize earphone external rings using sound detections devices such as microphones
The detection of border noise.The purpose of the ambient external noise of test earphone is to know that the currently used external environment of earphone is noise
It is miscellaneous or quiet, it can prepare in this way further to adjust received external audio signal, because the external environment of earphone is
It is noisy or quiet, user is caught and has direct influence in earphone.It should be noted that earphone external environment is not
It is ear canal, but earphone user's current environment.
Frequency range determines circuit 20, and the noise signal for being detected according to the environmental noise detection circuit 10 determines institute
State tonal range locating for the noise of earphone external environment；
The noise of audio full range segment signal (20~20000HZ) earphone external environment varies, after some time it is possible to reach audio is complete
The minimum 20HZ (hertz) of frequency range, it is also possible to reach the highest 20000HZ of audio full frequency band.Full range segment signal (20~
In 20000HZ), it may be possible to high, it is also possible to low.Full frequency band can be divided into multiple frequency ranges, example as needed in the present embodiment
Such as, it is divided into low frequency signal section (20H~781HZ), intermediate-freuqncy signal section (782HZ~1968HZ), high-frequency signal section (1969HZ~
20000HZ), it is of course also possible to be the frequency segmentation of other forms, even more frequency ranges, and according to ready-portioned audio
Frequency range, so that it may determine that the size of the noise signal detected determines tonal range locating for the noise signal, further to adjust
Whole received external audio signal is prepared.
Control circuit 30, for according to the frequency range determine circuit 20 determine the earphone external environment noise locating for
Tonal range, control first audio amplifier circuit 102 to phase in the received external audio signal of the reception circuit 101
The audio signal of tonal range is answered to amplify processing.
By taking low frequency signal section, intermediate-freuqncy signal section, high-frequency signal section as an example, in the noise for determining current earphone use environment
When middle low frequency signal is larger, corresponding adjustment receives the signal gain of low frequency band in the received audio signal of circuit 101, with enhancing
The loudness comparison of noise and earphone output audio, in this way, the low-frequency sound part in the sound that user hears is just clearer.
It is understood that when current earphone use environment noise in low frequency signal, intermediate-freuqncy signal, high-frequency signal all clearly
When, then the basic, normal, high frequency signal in received audio signal is all reinforced, makes the audio signal of loudspeaker final output is opposite to make an uproar
Sound is more obvious, is easy to be caught by user.And corresponding frequency in received audio signal is enhanced by the frequency range of corresponding noise
The voice parts of section, can make user that can clearly catch out partner in the noisy environment of different frequency range and speak
Content either external equipment input audio content.
It should be noted that can be according to the gain contrast situation of noise and audio in the present embodiment, corresponding adjust corresponds to
The audio size of frequency range, either, the audio for accordingly adjusting corresponding frequency band according to preset external noise detection loudness contour are big
It is small.The present embodiment preferably uses latter implementation mode, because human ear is to the feeling of sound, not only harmony is pressed with pass, also and frequently
Rate is related, and therefore, sound pressure level is identical and sound that frequency is different sounds clarity difference, and the latter approach is exactly to pass through
It adjusts the audio frequency of current corresponding tonal range and makes the audio signal of the tonal range for the best noise of ear recognition
Than so that ear recognition is clearer.Wherein, external noise detection loudness contour reflects Mic frequency response curve, human ear
The architectural characteristic of loudness contour and earphone, as shown in figure 3, external noise detects loudness contour use -4dB sound pressure level loudness contour
As adjust audio signal reference curve, by low pass frequency response curve, band logical frequency response curve and high pass frequency response curve superposition and
At abscissa is frequency, and unit is hertz (Hz), and ordinate is sound pressure level, and unit is decibel (dB).When detecting current earphone
Tonal range locating for the noise of use environment, such as when low frequency band, it is corresponding by the low pass frequency response curve of the reference curve
The audio size for adjusting present video low frequency band, reaches optimal signal-to-noise ratio, so that ear recognition is more clear
Chu.
Fig. 1 is also referred to, in a preferred embodiment, the control circuit 30 is specifically used for determining the environmental noise inspection
When the duration of the noise for the earphone external environment that slowdown monitoring circuit 10 detects is greater than preset threshold, then according to the frequency range
It determines tonal range locating for the noise for the earphone external environment that circuit 20 determines, controls first audio amplifier circuit
102 pairs of audio signals for receiving respective audio frequency range in the received external audio signal of circuit 101 amplify processing.
Have in the noise of earphone external environment it is random and continuous, when for random noise, then not to received ear
Machine signal carry out noise reduction process, if it is continuously just to received earphone signal carry out noise reduction process, this way it is possible to avoid with
The interference that machine noise signal controls noise reduction.Wherein it is possible to (default in a period of time by obtaining environmental noise detection circuit 10
Period) in noise measuring value, mean value calculation carried out to these noise measuring values, then by the average value and preset threshold into
Row compares；When average value is greater than preset threshold, then determines that current earphone external environment is in continuous noisy environment, need
Noise reduction process is carried out to received earphone signal；When average value be less than preset threshold when, then not to received earphone signal into
Row noise reduction process.Certainly it can also be realized using other modes, be not intended to limit herein.
Fig. 1 is also referred to, in a preferred embodiment, the control circuit 30 is also used to detect according to the environmental noise
The noise level for the earphone external environment that circuit 10 detects accordingly controls second audio amplifier circuit, 103 pairs of institutes
It states the amplified audio signal of the first audio amplifier circuit 102 and carries out the amplification of full range section audio.
In the earphone of this structure, by the second audio amplifier circuit 103 of control to the audio for being input to earphone horn
Signal carries out the amplification of full range section audio, and the loudness that can improve earphone horn output sound and noise again on the whole compares,
The sound for guaranteeing that human ear is heard is more clear.
Fig. 1 is also referred to, in further carrying out example, the downlink Dolby circuit of the earphone further include: for described
The noise signal that environmental noise detection circuit 10 detects amplifies the first signal amplification circuit 40 of processing.First signal is put
Big circuit 40 can be realized using any form of audio amplifier circuit.Purpose is in the present embodiment, improves environmental noise inspection
The intensity for the noise signal that slowdown monitoring circuit 10 detects, and then facilitate control, and improve the precision of control.
In the embodiment, further, the downlink Dolby circuit of the earphone further includes for putting to first signal
The filter circuit 50 that the noise signal that big circuit 40 exports is filtered.More through the filtered noise signal of filter circuit 50
Add pure, smooth, no noise jamming, control is got up more accurate.
Preferably, referring to Fig. 2, the filter circuit 50 include for input the signal input part In of noise measuring signal,
For exporting signal output end Out, low-pass filter unit 51, bandpass filtering unit 52 and the height of filtered noise measuring signal
Pass filtering unit 53, the input terminal of the low-pass filter unit 51, bandpass filtering unit 52 and high pass filter unit 53 with it is described
Signal input part In connection, the output end point of the low-pass filter unit 51, bandpass filtering unit 52 and high pass filter unit 53
Not Tong Guo a control switch connect with the signal output end Out；Control switch K1, the band of the low-pass filter unit 51
The control switch K2 of the pass filtering unit 52 and control switch K3 of the high pass filter unit 53 respectively with the control circuit 30
Connection.Control circuit 30 is by control switch K1, K2 and K3 to low-pass filter unit, bandpass filtering unit and high pass filter unit
Time-sharing control is carried out, place can be filtered to the high, medium and low frequency noise signal that environmental noise detection circuit 10 detects respectively
Reason, to improve filter effect.
Fig. 1 is also referred to, in further carrying out example, the downlink Dolby circuit of the earphone further include:
Human body voice collecting circuit 60, for when receiving external audio signal, acquiring the logical of the earphone user
Language sound, and export corresponding voice signal；
Signal inversion circuit 70, for being superimposed to the environmental noise detection after the voice signal is carried out reverse process
On the noise signal of the detection output of circuit 10.
It should be noted that the sound of user's call also can detect electricity by environmental noise when being conversed using earphone
Road 10 detects, the purpose in the present embodiment is to eliminate the user's communication voice that environmental noise detection circuit 10 detects, can be with
Avoid the interference of user's call sound.Specifically, by acquiring the earphone user to human body voice collecting circuit 60
Call voice, and export corresponding voice signal, then carried out the speech detection signal by signal inversion circuit 70
It is superimposed to after reverse process on the noise signal of the detection of environmental noise detection circuit 10 output, so that it may so that the language after reversed
The user for including in the noise signal for the earphone external environment that sound signal and environmental noise detection circuit 10 detect converses
Voice signal offset, realize avoid user call sound interference.
Fig. 1 is also referred to, in further carrying out example, the downlink Dolby circuit of the earphone further includes for the people
The voice signal that body voice collecting circuit 60 exports amplifies the second signal amplifying circuit 80 of processing.Second signal amplification electricity
Road 80 can be realized using any form of audio amplifier circuit, be superimposed to the environmental noise detection electricity after enhanced processing again
On the noise signal of the detection output of road 10, the strong of the human body voice signal of the acquisition output of human body voice collecting circuit 60 can be improved
Degree, and then facilitate control, and improve the precision of control.
It should be noted that when using the embodiment of the first signal amplification circuit 40 and second signal amplifying circuit 80,
The voice signal that then human body voice collecting circuit 60 exports is in reversed, the second signal amplifying circuit 80 by signal inversion circuit 70
After amplification, then correspondence is superimposed on the amplified noise signal of the first signal amplification circuit 40, and guarantees the first signal amplification electricity
Road 40 is consistent with the magnification ratio of second signal amplifying circuit 80.
To sum up, the downlink Dolby circuit of earphone proposed by the present invention is by setting for receiving in the reception circuit 101
When to external audio signal, the environmental noise detection circuit 10 of the noise signal of test earphone external environment, for according to
The noise signal that environmental noise detection circuit 10 detects determines tonal range locating for the noise of the earphone external environment
Frequency range determines locating for circuit 20 and the noise of the earphone external environment for determining the determination of circuit 20 according to the frequency range
Tonal range control first audio amplifier circuit 102 to phase in the received external audio signal of the reception circuit 101
Answer the audio signal of tonal range to amplify the control circuit 30 of processing so that earphone horn output voice signal in make an uproar
Sound with frequency range reinforced partly so that earphone horn output voice signal in noise with the reinforced partly of frequency range, to mention
The high clarity of earphone horn output sound, catch out user can clearly in the noisy environment of different frequency range
The audio content of the content that partner is spoken either external equipment input, in this way, just improving the effect of downlink noise reduction.
In addition, it should be noted that, since earphone of the present invention uses all implementations of downlink Dolby circuit of above-mentioned earphone
Whole technical solutions of example, then earphone of the present invention accordingly has the technical solution institute of the embodiment of the downlink Dolby circuit of the earphone
All beneficial effects of bring, this is no longer going to repeat them.
Based on above-mentioned earphone, the present invention proposes a kind of downlink noise-reduction method of earphone, referring especially to Fig. 1 and Fig. 4, in this hair
In a bright embodiment, the downlink noise-reduction method of the earphone includes:
Step S10, when receiving external audio signal, the noise signal of test earphone external environment；
The detection of earphone ambient external noise can be realized using sound detections devices such as microphones.The external rings of test earphone
The purpose of border noise is to know that the currently used external environment of earphone is noisy or quiet, can be so further tune
Whole received external audio signal is prepared because the external environment of earphone be it is noisy or quiet, ear is caught for user
Direct influence is had in machine.It should be noted that earphone external environment not instead of ear canal, earphone user are presently in
Environment.
Step S20 determines the frequency of audio locating for the noise of the earphone external environment according to the noise signal detected
Section；
The noise of audio full range segment signal (20~20000HZ) earphone external environment varies, after some time it is possible to reach audio is complete
The minimum 20HZ (hertz) of frequency range, it is also possible to reach the highest 20000HZ of audio full frequency band.Full range segment signal (20~
In 20000HZ), it may be possible to high, it is also possible to low.Full frequency band can be divided into multiple frequency ranges, example as needed in the present embodiment
Such as, it is divided into low frequency signal section (20H~781HZ), intermediate-freuqncy signal section (782HZ~1968HZ), high-frequency signal section (1969HZ~
20000HZ), it is of course also possible to be the frequency segmentation of other forms, even more frequency ranges, and according to ready-portioned audio
Frequency range, so that it may determine that the size of the noise signal detected determines tonal range locating for the noise signal, further to adjust
Whole received external audio signal is prepared.
Step S30, according to tonal range locating for the noise of the identified earphone external environment, to the external sound
The audio signal of respective audio frequency range amplifies processing in frequency signal.
By taking low frequency signal section, intermediate-freuqncy signal section, high-frequency signal section as an example, in the noise for determining current earphone use environment
When middle low frequency signal is larger, corresponding adjustment receives the signal gain of low frequency band in the received audio signal of circuit 101, with enhancing
The loudness comparison of noise and earphone output audio, in this way, the low-frequency sound part in the sound that user hears is just clearer.
It is understood that when current earphone use environment noise in low frequency signal, intermediate-freuqncy signal, high-frequency signal all clearly
When, then the basic, normal, high frequency signal in received audio signal is all reinforced, makes the audio signal of loudspeaker final output is opposite to make an uproar
Sound is more obvious, is easy to be caught by user.And corresponding frequency in received audio signal is enhanced by the frequency range of corresponding noise
The voice parts of section, can make user that can clearly catch out partner in the noisy environment of different frequency range and speak
Content either external equipment input audio content.
The downlink noise-reduction method of earphone proposed by the present invention is by when receiving external audio signal, outside test earphone
The noise signal of environment, and the frequency of the audio according to locating for the noise that the noise signal detected determines the earphone external environment
Section, the then tonal range according to locating for the noise of the identified earphone external environment, in the external audio signal
The audio signal of respective audio frequency range amplifies processing, so that with noise with frequency range in the voice signal of earphone horn output
Reinforced partly, thus improve earphone horn output sound clarity, make user in the noisy environment of different frequency range all
The audio content that the content either external equipment input that partner is spoken can clearly be caught out, in this way, just improving
The effect of downlink noise reduction.
Referring to Fig. 5, in a preferred embodiment, above-mentioned steps S30 can be replaced step S30 ', and the step S30 ' is specific
Include:
When the duration of the noise of the earphone external environment confirmly detected being greater than preset threshold, then according to institute
Tonal range locating for the noise of the determining earphone external environment, to respective audio frequency range in the external audio signal
Audio signal amplifies processing.
Have in the noise of earphone external environment it is random and continuous, when for random noise, then not to received ear
Machine signal carry out noise reduction process, if it is continuously just to received earphone signal carry out noise reduction process, this way it is possible to avoid with
The interference that machine noise signal controls noise reduction.Wherein it is possible to by obtaining the noise measuring in a period of time (preset time period)
Value carries out mean value calculation to these noise measuring values, then the average value is compared with preset threshold；When average value is greater than
When preset threshold, then determines that current earphone external environment is in continuous noisy environment, need to received earphone signal
Carry out noise reduction process；When average value is less than preset threshold, then noise reduction process is not carried out to received earphone signal.Certainly may be used also
It realizes in a manner of using others, is not intended to limit herein.
In a preferred embodiment, the step S30 further include:
According to the noise level of the earphone external environment detected, the amplified external audio signal is mutually coped with
Carry out the amplification of full range section audio.
In the earphone of this structure, by carrying out the amplification of full range section audio to the audio signal for being input to earphone horn,
The loudness that earphone horn output sound and noise can be improved again on the whole compares, and the sound for guaranteeing that human ear is heard is more clear
It is clear.
Referring to Fig. 6, in further carrying out example, between the step S10 and step S20, the downlink of the earphone
Noise-reduction method further include:
Step S11 amplifies processing to the noise signal detected.Purpose is in the present embodiment, improves and detects
The intensity of noise signal, and then facilitate control, and improve the precision of control.
In the embodiment, further, after executing the step S11, the downlink noise-reduction method of the earphone is also wrapped
It includes:
Step S12 is filtered the noise signal after enhanced processing.Filtered noise signal is purer
Only, smoothly, no noise jamming, control are got up more accurate.
Preferably, the step S12 is specifically included is filtered place to the high, medium and low frequency noise signal detected respectively
Reason, to improve filter effect.
Referring to Fig. 7, in further carrying out example, the downlink noise-reduction method of the earphone further include:
Step S40 acquires the call voice of the earphone user, and output pair when receiving external audio signal
The voice signal answered；
Step S50 is superimposed to the earphone external environment detected after the voice signal is carried out reverse process
On noise signal.
It should be noted that the sound of user's call can be also detected, the present embodiment when being conversed using earphone
In purpose be to eliminate the user's communication voice detected, can to avoid user converse sound interference.Specifically, lead to
The call voice for acquiring the earphone user is crossed, and exports corresponding voice signal, is then carried out speech detection signal anti-
It is superimposed to after to processing on the noise signal of earphone external environment, so that it may so that voice signal after reversed and the earphone detected
The voice signal for the user's call for including in the noise signal of external environment offsets, and realization avoids user's call sound
The interference of sound.
Fig. 7 is also referred to, in further carrying out example, between the step S40 and step S50, under the earphone
Row noise-reduction method further include:
Step S45 amplifies processing to the call voice signal of the collected earphone user.After enhanced processing
It is superimposed on the noise signal of the earphone external environment detected again, can be improved the human body voice signal of acquisition output
Intensity, and then facilitate control, and improve the precision of control.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (7)
1. a kind of downlink Dolby circuit of earphone, the earphone include reception circuit for receiving external audio signal and for pair
Received external audio signal is amplified and is exported to the first audio amplifier circuit of loudspeaker；It is characterized in that, the earphone
Downlink Dolby circuit include:
Environmental noise detection circuit, for when the reception circuit receives external audio signal, test earphone external environment
Noise signal；
Frequency range determines circuit, and the noise signal for being detected according to the environmental noise detection circuit determines outside the earphone
Tonal range locating for the noise of portion's environment；
Control circuit, for according to the frequency range determine circuit determine the earphone external environment noise locating for audio frequency
Section controls first audio amplifier circuit to the sound of respective audio frequency range in the reception received external audio signal of circuit
Frequency signal amplifies processing；
Wherein, the downlink Dolby circuit of the earphone further include:
Human body voice collecting circuit, for when receiving external audio signal, acquiring the call voice of the earphone user,
And export corresponding voice signal；
Signal inversion circuit, for being superimposed to the environmental noise detection circuit inspection after the voice signal is carried out reverse process
It surveys on the noise signal of output；
Wherein, the downlink Dolby circuit of the earphone further includes the noise letter for detecting to the environmental noise detection circuit
Number amplify the first signal amplification circuit of processing；
Wherein, the downlink Dolby circuit of the earphone further includes for the voice signal to the human body voice collecting circuit output
Amplify the second signal amplifying circuit of processing；
Wherein, the voice signal of the human body voice collecting circuit output is reversed by the signal inversion circuit, and described the
After the amplification of binary signal amplifying circuit, then correspondence is superimposed on the amplified noise signal of the first signal amplification circuit, and institute
It is consistent with the magnification ratio of the second signal amplifying circuit to state the first signal amplification circuit.
2. the downlink Dolby circuit of earphone as described in claim 1, which is characterized in that the earphone further includes for will be described
The amplified audio signal of first audio amplifier circuit carries out two stage gain amplifications and exports to the second audio of the loudspeaker to put
Big circuit；The control circuit, the earphone external environment for being also used to be detected according to the environmental noise detection circuit
Noise level, accordingly control second audio amplifier circuit to the amplified audio signal of the first audio amplifier circuit into
The amplification of row full range section audio.
3. the downlink Dolby circuit of earphone as described in claim 1, which is characterized in that the downlink Dolby circuit of the earphone is also
The filter circuit being filtered including the noise signal for being exported to first signal amplification circuit.
4. the downlink Dolby circuit of earphone as claimed in claim 3, which is characterized in that the filter circuit includes for inputting
The signal input part of noise measuring signal, the signal output end for exporting filtered noise measuring signal, low-pass filtering list
Member, bandpass filtering unit and high pass filter unit, the low-pass filter unit, bandpass filtering unit and high pass filter unit it is defeated
Enter end to connect with the signal input part, the output end of the low-pass filter unit, bandpass filtering unit and high pass filter unit
It is connect respectively by a control switch with the signal output end；The control switch of the low-pass filter unit, band logical filter
The control switch of the control switch of wave unit and the high pass filter unit is connect with the control circuit respectively.
5. a kind of earphone, which is characterized in that the downlink Dolby circuit including the earphone as described in Claims 1-4 any one.
6. a kind of downlink noise-reduction method of earphone, which is characterized in that this method comprises:
When receiving external audio signal, the noise signal of test earphone external environment；
According to the noise signal detected, tonal range locating for the noise of the earphone external environment is determined；
According to tonal range locating for the noise of the identified earphone external environment, to corresponding in the external audio signal
The audio signal of tonal range amplifies processing；
Wherein, the downlink noise-reduction method of the earphone further include:
When receiving external audio signal, the call voice of the earphone user is acquired, and exports corresponding voice signal；
It is superimposed on the noise signal of the earphone external environment detected after the voice signal is carried out reverse process；
Wherein, described when receiving external audio signal, the step of the noise signal of test earphone external environment with it is described
It is described between the step of determining tonal range locating for the noise of the earphone external environment according to the noise signal detected
The downlink noise-reduction method of earphone further include:
Processing is amplified to the noise signal detected；
Wherein, described when receiving external audio signal, the call voice of the earphone user is acquired, and exports correspondence
Voice signal the step of with it is described by the voice signal carry out reverse process after be superimposed to outside the earphone detected
Between step on the noise signal of environment, the downlink noise-reduction method of the earphone further include:
Processing is amplified to the call voice signal of the collected earphone user, is superimposed to detection again after enhanced processing
To the earphone external environment noise signal on.
7. the downlink noise-reduction method of earphone as claimed in claim 6, which is characterized in that the earphone described according to determined by
Tonal range locating for the noise of external environment puts the audio signal of respective audio frequency range in the external audio signal
Big processing specifically includes:
When the duration of the noise of the earphone external environment confirmly detected being greater than preset threshold, then according to determining
The earphone external environment noise locating for tonal range, to the audio of respective audio frequency range in the external audio signal
Signal amplifies processing.
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| CN108063996A (en) * | 2018-01-24 | 2018-05-22 | 江西联创宏声万安电子有限公司 | A kind of Type C interface earphone and its implementation |
| CN110856068B (en) * | 2019-11-05 | 2022-09-09 | 南京中感微电子有限公司 | Communication method of earphone device |
| CN112700760B (en) * | 2020-12-23 | 2022-05-24 | 新沂市承翔电子有限公司 | Noise-reduction strong-sound electronic buzzer and control system and control method thereof |
| CN115665643B (en) * | 2022-12-12 | 2023-03-17 | 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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| CN1620751A (en) * | 2000-08-14 | 2005-05-25 | 清晰音频有限公司 | Voice enhancement system |
| CN102413403A (en) * | 2010-09-03 | 2012-04-11 | Nxp股份有限公司 | Noise reduction circuit and method therefor |
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| JP4623124B2 (en) * | 2008-04-07 | 2011-02-02 | ソニー株式会社 | Music playback device, music playback method, and music playback program |
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| CN1620751A (en) * | 2000-08-14 | 2005-05-25 | 清晰音频有限公司 | Voice enhancement system |
| CN102413403A (en) * | 2010-09-03 | 2012-04-11 | Nxp股份有限公司 | Noise reduction circuit and method therefor |
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