CN105872884A - Headset as well as downlink noise reduction circuit and method for headset - Google Patents

Headset as well as downlink noise reduction circuit and method for headset Download PDF

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Publication number
CN105872884A
CN105872884A CN201610353164.1A CN201610353164A CN105872884A CN 105872884 A CN105872884 A CN 105872884A CN 201610353164 A CN201610353164 A CN 201610353164A CN 105872884 A CN105872884 A CN 105872884A
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China
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noise
earphone
circuit
signal
audio
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CN201610353164.1A
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CN105872884B (en
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丘方纯
彭涛
郑厚水
刘林
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TCL Tongli Electronics Huizhou Co Ltd
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TCL Tongli Electronics Huizhou Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083Reduction of ambient noise

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a headset as well as a downlink noise reduction circuit and method for the headset. The downlink noise reduction circuit for the headset comprises an environmental noise detection circuit, a frequency band determination circuit and a control circuit, wherein the environmental noise detection circuit is used for detecting noise signals of an external environment of the headset when a receiving circuit receives external audio signals; the frequency band determination circuit is used for determining an audio frequency band where the noise of the external environment of the headset is located according to the noise signals detected by the environmental noise detection circuit; the control circuit is used for controlling a first audio amplification circuit to amplify audio signals in the corresponding audio frequency band in the external audio signals received by the receiving circuit according to the audio frequency band, where the noise of the external environment of the headset is located, determined by the frequency band determination circuit. According to the headset as well as the downlink noise reduction circuit and method for the headset, the downlink noise reduction of the headset signals is realized, so that a user can clearly hear talking content of the opposite party of a call or audio content input by peripheral equipment in the environment where the noise is located in different frequency bands.

Description

Earphone, the descending Dolby circuit of earphone and method
Technical field
The present invention relates to ear phone technology field, particularly relate to a kind of earphone, the descending Dolby circuit of earphone and Method.
Background technology
Earphone noise reduction is divided into up noise reduction and descending noise reduction two class, and the purpose of up noise reduction is to make listening Understand that my one's voice in speech, the purpose of descending noise reduction make me can catch the other side or earphone sends Sound.Traditional descending noise-reduction method mainly uses stifled mode to eliminate external noise.But at present The little earbud headphone of major part, such as bluetooth traffic type earphone and various wired little headset, is limited by space structure, It is extremely difficult to the sealing requirements of above-mentioned descending noise reduction, therefore, traditional earphone descending noise-reduction method effect Poor.
Summary of the invention
Present invention is primarily targeted at the descending Dolby circuit that a kind of earphone is provided, it is intended to improve under earphone The effect of row noise reduction.
For achieving the above object, the present invention proposes the descending Dolby circuit of a kind of earphone, and this earphone includes using In receiving receiving circuit and being used for the external audio signal of reception is amplified and defeated of external audio signal Go out the first audio amplifier circuit to loudspeaker;The descending Dolby circuit of described earphone includes:
Environmental noise testing circuit, for when described reception circuit receives external audio signal, detects The noise signal of earphone external environment condition;
Frequency range determines circuit, for the noise signal detected according to described environmental noise testing circuit, really The tonal range residing for noise of fixed described earphone external environment condition;
Control circuit, for determining the noise of described earphone external environment condition that circuit determines according to described frequency range Residing tonal range, controls the outside sound that described reception circuit is received by described first audio amplifier circuit Frequently in signal, the audio signal of respective audio frequency range is amplified processing.
Preferably, described earphone also includes the audio frequency letter after being amplified by described first audio amplifier circuit Number carry out two stage gain amplifications and export the second audio amplifier circuit to described loudspeaker;Described control circuit, It is additionally operable to the noise level of the described earphone external environment condition detected according to described environmental noise testing circuit, Described second audio amplifier circuit of corresponding control is to the audio signal after described first audio amplifier circuit amplification Carry out full frequency band audio frequency amplification.
Preferably, the descending Dolby circuit of described earphone also includes: for described environmental noise detection electricity The noise signal that road detects is amplified the first signal amplification circuit processed.
Preferably, the descending Dolby circuit of described earphone also includes for described first signal amplification circuit The noise signal of output is filtered the filter circuit processed.
Preferably, described filter circuit include the signal input part for inputting noise measuring signal, for Export the signal output part of filtered noise measuring signal, low-pass filter unit, bandpass filtering unit and High pass filter unit, described low-pass filter unit, bandpass filtering unit and the input of high pass filter unit It is connected with described signal input part, described low-pass filter unit, bandpass filtering unit and high pass filter unit Outfan respectively by one control switch be connected with described signal output part;Described low-pass filter unit Control the control switch point controlling switch and described high pass filter unit of switch, described bandpass filtering unit It is not connected with described control circuit.
Preferably, human body voice collecting circuit, for when receiving external audio signal, gather described The call voice of earphone user, and export the voice signal of correspondence;
Signal inversion circuit, is superimposed to described environment after described voice signal is carried out reverse process and makes an uproar On the noise signal of tone detection circuit detection output.
The present invention also proposes a kind of earphone, this earphone include earphone as above descending Dolby circuit, For receiving the reception circuit of external audio signal and for the external audio signal received is amplified also Export the first audio amplifier circuit to loudspeaker;The descending Dolby circuit of described earphone includes: environmental noise Testing circuit, is used for when described reception circuit receives external audio signal, test earphone external environment condition Noise signal;Frequency range determines circuit, for the noise detected according to described environmental noise testing circuit Signal, determines the tonal range residing for noise of described earphone external environment condition;Control circuit, for basis Described frequency range determines the tonal range residing for noise of the described earphone external environment condition that circuit determines, controls institute State respective audio frequency range in the external audio signal that described reception circuit is received by the first audio amplifier circuit Audio signal is amplified processing.
Additionally, the present invention also proposes the descending noise-reduction method of a kind of earphone, the method includes:
When receiving external audio signal, the noise of test earphone external environment condition;
According to the noise signal detected, determine the tonal range residing for noise of described earphone external environment condition;
The tonal range residing for noise of described earphone external environment condition determined by according to, to described outside sound Frequently in signal, the audio signal of respective audio frequency range is amplified processing.
Preferably, the tonal range residing for noise of described earphone external environment condition determined by described basis, The audio signal of respective audio frequency range in described external audio signal is amplified process specifically include:
When determining that the persistent period of noise of the described earphone external environment condition detected is more than predetermined threshold value, The then tonal range residing for noise of described earphone external environment condition determined by basis, to described external audio In signal, the audio signal of respective audio frequency range is amplified processing.
Preferably, the descending noise-reduction method of described earphone also includes:
When receiving external audio signal, gather the call voice of described earphone user, and export right The voice signal answered;
Making an uproar of the described earphone external environment condition being superimposed to after described voice signal is carried out reverse process to detect In tone signal.
The present invention passes through to be provided for when described reception circuit receives external audio signal, test earphone The environmental noise testing circuit of the noise signal of external environment condition, for according to described environmental noise testing circuit The noise signal detected, determines that the frequency range of the tonal range residing for noise of described earphone external environment condition is true Determine circuit and for determining according to described frequency range residing for the noise of described earphone external environment condition that circuit determines Tonal range, control the external audio letter that described reception circuit receives by described first audio amplifier circuit In number, the audio signal of respective audio frequency range is amplified the control circuit processed so that earphone horn exports Acoustical signal in noise with the reinforced partly of frequency range so that in the acoustical signal of earphone horn output with Noise is with the reinforced partly of frequency range, thus improves the definition of earphone horn output sound, makes user Content that partner speaks or outer can be caught out clearly in the noisy environment of different frequency range The audio content of portion's equipment input, so, just improves the effect of descending noise reduction.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below, Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art, On the premise of not paying creative work, it is also possible to obtain other according to the structure shown in these accompanying drawings Accompanying drawing.
Fig. 1 is the high-level schematic functional block diagram that the descending Dolby circuit of earphone of the present invention is applied in earphone;
Fig. 2 is the electrical block diagram of filter circuit one embodiment of the present invention;
Fig. 3 is that external noise of the present invention detects loudness contour;
Fig. 4 is the schematic flow sheet of the descending noise-reduction method first embodiment of earphone of the present invention;
Fig. 5 is the schematic flow sheet of descending noise-reduction method second embodiment of earphone of the present invention;
Fig. 6 is the schematic flow sheet of descending noise-reduction method the 3rd embodiment of earphone of the present invention;
Fig. 7 is the schematic flow sheet of descending noise-reduction method the 4th embodiment of earphone of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings further Explanation.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having Pay the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
It is to be appreciated that the description relating to " first ", " second " etc. in the present invention is only used for describing purpose, and It is not intended that indicate or imply its relative importance or the implicit number indicating indicated technical characteristic Amount.Thus, define " first ", the feature of " second " can express or implicitly include at least one should Feature.It addition, the technical scheme between each embodiment can be combined with each other, but must be with ability Based on territory those of ordinary skill is capable of, when the combination of technical scheme occurs conflicting or cannot be real Will be understood that the combination of this technical scheme does not exists now, the most not application claims protection domain it In.
The present invention proposes a kind of earphone and descending Dolby circuit thereof and method.
As it is shown in figure 1, earphone of the present invention includes receiving circuit the 101, first audio amplifier circuit 102 and the Two audio amplifier circuits 103, wherein, receive circuit 101 and are used for receiving external audio signal;First audio frequency Amplifying circuit 102 is for being amplified the external audio signal received;Second audio amplifier circuit 103 Audio signal after being amplified by described first audio amplifier circuit 102 carries out two stage gain amplifications defeated Go out to loudspeaker broadcasting.
Further, earphone of the present invention also includes the descending Dolby circuit of earphone, for earphone is carried out descending fall Make an uproar, make user can catch out what partner was spoken clearly in the noisy environment of different frequency range Content or the audio content of external equipment input.
Referring especially to Fig. 1, in an embodiment of the present invention, the descending Dolby circuit of described earphone includes:
Environmental noise testing circuit 10, is used for when described reception circuit 101 receives external audio signal, The noise signal of test earphone external environment condition;Environmental noise testing circuit 10 can use the first-class sound of miaow to examine Survey device and realize the detection of earphone ambient external noise.The purpose of the ambient external noise of test earphone be for Know that the currently used external environment condition of earphone is noisy or quiet, can be so to adjust further to connect The external audio signal received is prepared, because the external environment condition of earphone is noisy or quiet, for user Directly impact is had in catching earphone.It should be noted that earphone external environment condition is not auditory meatus, But earphone user is presently in environment.
Frequency range determines circuit 20, for the noise signal detected according to described environmental noise testing circuit 10, Determine the tonal range residing for noise of described earphone external environment condition;
The noise of audio frequency full frequency band signal (20~20000HZ) earphone external environment condition varies, Ke Nengda Minimum 20HZ (hertz) to audio frequency full frequency band, it is also possible to reach the highest by 20000 of audio frequency full frequency band HZ.In full frequency band signal (20~20000HZ), it may be possible to high, it is also possible to low.In the present embodiment As required full frequency band can be divided into multiple frequency range, such as, be divided into low frequency signal section (20H~781H Z), intermediate-freuqncy signal section (782HZ~1968HZ), high-frequency signal section (1969HZ~20000HZ), certainly, Can also be the frequency segmentation of other forms, even more frequency range, and according to ready-portioned audio frequency frequency Section, it is possible to determine that the size of the noise signal detected determines the tonal range residing for this noise signal, Prepare for adjusting the external audio signal received further.
Control circuit 30, for determining, according to described frequency range, described earphone external environment condition that circuit 20 determines Tonal range residing for noise, controls described first audio amplifier circuit 102 to described reception circuit 101 In the external audio signal received, the audio signal of respective audio frequency range is amplified processing.
As a example by low frequency signal section, intermediate-freuqncy signal section, high-frequency signal section, determining that current earphone uses When the noise medium and low frequency signal of environment is bigger, low in the corresponding audio signal adjusting reception circuit 101 reception Again and again the signal gain of section, to strengthen noise and the loudness contrast of earphone output audio frequency, so, user Low-frequency sound part in the sound heard is the clearest.It is understood that when current earphone uses The noise medium and low frequency signal of environment, intermediate-freuqncy signal, high-frequency signal the most clearly time, then will receive sound Frequently the basic, normal, high frequency signal in signal is all strengthened, and makes the audio signal relative noise that loudspeaker finally export Become apparent from, easily caught by user.And strengthen, by the frequency range of corresponding noise, the audio frequency received and believe The voice parts of corresponding frequency band in number, it is possible to make the user can be clear in the noisy environment of different frequency range Catch out the content or the audio content of external equipment input that partner speaks.
It should be noted that can be according to the gain contrast situation of noise Yu audio frequency in the present embodiment, accordingly The audio frequency size of regulation corresponding frequency band, or, corresponding according to preset external noise detection loudness contour The audio frequency size of regulation corresponding frequency band.The present embodiment preferably employs latter implementation mode, because human ear pair The sensation of sound, not only harmony is pressed with pass, also relevant with frequency, therefore, sound pressure level is identical and frequency not With sound sound that definition is different, and this latter approach to be through regulating current diaphone frequent Section audio frequency and make the optimum signal-noise ratio that audio signal is ear recognition of this tonal range, and then Make the clearer of ear recognition.Wherein, external noise detection loudness contour reflects Mic frequency response song Line, human ear loudness contour and the architectural characteristic of earphone, as it is shown on figure 3, external noise detection loudness contour Using-4dB sound pressure level loudness contour as the reference curve of regulation audio signal, it is by low pass frequency response curve, The logical frequency response curve of band and high pass frequency response curve are formed by stacking, and abscissa is frequency, and unit is hertz (Hz), Vertical coordinate is sound pressure level, and unit is decibel (dB).When detecting that current earphone uses residing for the noise of environment Tonal range, such as during low frequency frequency range, by the low pass frequency response curve of this reference curve, corresponding regulation The audio frequency size of present video low frequency frequency range so that it is reach optimal signal to noise ratio, so that ear recognition Clearer.
Referring also to Fig. 1, in a preferred embodiment, described control circuit 30 specifically for determine described The persistent period of the noise of the described earphone external environment condition that environmental noise testing circuit 10 detects is more than presetting During threshold value, then determine according to described frequency range residing for the noise of described earphone external environment condition that circuit 20 determines Tonal range, controls the outside that described reception circuit 101 is received by described first audio amplifier circuit 102 In audio signal, the audio signal of respective audio frequency range is amplified processing.
The noise of earphone external environment condition has random and continuous print, when for random noise, the most right The earphone signal received carries out noise reduction process, if continuous print just carries out noise reduction to the earphone signal received Process, this way it is possible to avoid the interference that noise reduction is controlled by random noise signal.Wherein it is possible to by obtaining Take the environmental noise testing circuit 10 noise measuring value within a period of time (preset time period), to these The noise measuring value value that is averaged calculates, then this meansigma methods is compared with predetermined threshold value;Work as meansigma methods During more than predetermined threshold value, then judge that current earphone external environment condition is in the most noisy environment, need The earphone signal received is carried out noise reduction process;When meansigma methods is less than predetermined threshold value, the most not to reception Earphone signal carries out noise reduction process.Certainly can realize in the way of using other, be not limiting as herein.
Referring also to Fig. 1, in a preferred embodiment, described control circuit 30, it is additionally operable to according to described ring The noise level of the described earphone external environment condition that border noise measuring circuit 10 detects, corresponding controls described the Audio signal after described first audio amplifier circuit 102 is amplified by two audio amplifier circuits 103 is carried out entirely Frequency band audio amplifies.
In the earphone of this structure, by controlling the second audio amplifier circuit 103 to input to earphone loudspeaker Audio signal carries out full frequency band audio frequency amplification, can the most again improve earphone horn output sound Sound contrasts with the loudness of noise, it is ensured that the sound that human ear is heard becomes apparent from.
Referring also to Fig. 1, in further carrying out example, the descending Dolby circuit of described earphone also includes: use The first signal being amplified processing in the noise signal described environmental noise testing circuit 10 being detected is put Big circuit 40.First signal amplification circuit 40 can use any form of audio amplifier circuit to realize. In the present embodiment, purpose is, improves the intensity of the noise signal that environmental noise testing circuit 10 detects, enters And conveniently control, and improve the precision of control.
In this embodiment, further, the descending Dolby circuit of described earphone also includes for described The noise signal of one signal amplification circuit 40 output is filtered the filter circuit 50 processed.Filtered circuit 50 filtered noise signals are purer, smooth, and without noise jamming, it is more accurate that control is got up.
Preferably, with reference to Fig. 2, described filter circuit 50 includes the signal for inputting noise measuring signal Input In, for exporting the signal output part Out of filtered noise measuring signal, low-pass filter unit 51, bandpass filtering unit 52 and high pass filter unit 53, described low-pass filter unit 51, bandpass filtering The input of unit 52 and high pass filter unit 53 is connected with described signal input part In, described low pass filtered The outfan of ripple unit 51, bandpass filtering unit 52 and high pass filter unit 53 is left by a control respectively Close and be connected with described signal output part Out;The control switch K1, described of described low-pass filter unit 51 The control switch K3 controlling switch K2 and described high pass filter unit 53 of bandpass filtering unit 52 is respectively It is connected with described control circuit 30.Control circuit 30 is by controlling switch K1, K2 and K3 to low pass filtered Ripple unit, bandpass filtering unit and high pass filter unit carry out Time-sharing control, can be respectively to environmental noise The high, medium and low frequency noise signal that testing circuit 10 detects is filtered processing, to improve filter effect.
Referring also to Fig. 1, in further carrying out example, the descending Dolby circuit of described earphone also includes:
Human body voice collecting circuit 60, for when receiving external audio signal, gathers described earphone and makes The call voice of user, and export the voice signal of correspondence;
Signal inversion circuit 70, is superimposed to described environment after described voice signal is carried out reverse process On the noise signal of noise measuring circuit 10 detection output.
It should be noted that when using earphone call, the sound of user's call also can be made an uproar by environment Tone detection circuit 10 detects, the purpose in the present embodiment is, eliminates environmental noise testing circuit 10 and examines The user's communication voice measured, can avoid the interference of user's call sound.Specifically, by right Human body voice collecting circuit 60, gathers the call voice of described earphone user, and exports the voice of correspondence Signal, is superimposed to after then described speech detection signal being carried out reverse process by signal inversion circuit 70 On the noise signal of described environmental noise testing circuit 10 detection output, so that it may so that the voice letter after Fan Xiang The user comprised in the noise signal of number earphone external environment condition detected with environmental noise testing circuit 10 this The acoustical signal of people's call offsets, it is achieved avoid the interference of user's call sound.
Referring also to Fig. 1, in further carrying out example, the descending Dolby circuit of described earphone also include for The secondary signal being amplified processing to the voice signal of described human body voice collecting circuit 60 output amplifies electricity Road 80.Secondary signal amplifying circuit 80 can use any form of audio amplifier circuit to realize, and amplifies It is superimposed to again after process on the noise signal of described environmental noise testing circuit 10 detection output, it is possible to increase Human body voice collecting circuit 60 gathers the intensity of the human body voice signal of output, and then convenient control, and carries The high precision controlled.
It should be noted that when using the first signal amplification circuit 40 and secondary signal amplifying circuit 80 During embodiment, then the voice signal of human body voice collecting circuit 60 output is through signal inversion circuit 70 Reversely, after secondary signal amplifying circuit 80 amplifies, then correspondence is superimposed to the first signal amplification circuit 40 and puts On noise signal after great, and ensure the first signal amplification circuit 40 and secondary signal amplifying circuit 80 Magnification ratio is consistent.
To sum up, the descending Dolby circuit of the earphone that the present invention proposes is by being provided at described reception circuit 101 when receiving external audio signal, the environmental noise detection electricity of the noise signal of test earphone external environment condition Road 10, for the noise signal that detects according to described environmental noise testing circuit 10, determine described earphone The frequency range of the tonal range residing for the noise of external environment condition determines circuit 20 and for true according to described frequency range The tonal range residing for noise determining the described earphone external environment condition that circuit 20 determines controls described first audio frequency The sound of respective audio frequency range in the external audio signal that described reception circuit 101 is received by amplifying circuit 102 Frequently signal is amplified the control circuit 30 processed so that with noise in the acoustical signal of earphone horn output Reinforced partly with frequency range so that increase with the part of frequency range with noise in the acoustical signal of earphone horn output By force, thus improve the definition of earphone horn output sound, make user at the noise ring of different frequency range Border can be caught out clearly in the audio frequency of content that partner speaks or external equipment input Hold, so, just improve the effect of descending noise reduction.
Furthermore, it is necessary to explanation, owing to earphone of the present invention have employed the descending Dolby circuit of above-mentioned earphone Whole technical schemes of all embodiments, earphone the most of the present invention has the descending Dolby circuit of this earphone accordingly All beneficial effects of being brought of the technical scheme of embodiment, this is no longer going to repeat them.
Based on above-mentioned earphone, the present invention proposes the descending noise-reduction method of a kind of earphone, referring especially to Fig. 1 and Fig. 4, in an embodiment of the present invention, the descending noise-reduction method of described earphone includes:
Step S10, when receiving external audio signal, the noise signal of test earphone external environment condition;
Miaow first-class sound detection device can be used to realize the detection of earphone ambient external noise.Test earphone The purpose of ambient external noise be to be noisy or peace to know the currently used external environment condition of earphone Quiet, can be so to adjust the external audio signal received further to prepare, because the external rings of earphone Border is noisy or quiet, has directly impact in catching earphone for user.Need explanation It is that earphone external environment condition is not auditory meatus, but earphone user is presently in environment.
Step S20, according to the noise signal detected, determines residing for the noise of described earphone external environment condition Tonal range;
The noise of audio frequency full frequency band signal (20~20000HZ) earphone external environment condition varies, Ke Nengda Minimum 20HZ (hertz) to audio frequency full frequency band, it is also possible to reach the highest by 20000 of audio frequency full frequency band HZ.In full frequency band signal (20~20000HZ), it may be possible to high, it is also possible to low.In the present embodiment As required full frequency band can be divided into multiple frequency range, such as, be divided into low frequency signal section (20H~781H Z), intermediate-freuqncy signal section (782HZ~1968HZ), high-frequency signal section (1969HZ~20000HZ), certainly, Can also be the frequency segmentation of other forms, even more frequency range, and according to ready-portioned audio frequency frequency Section, it is possible to determine that the size of the noise signal detected determines the tonal range residing for this noise signal, Prepare for adjusting the external audio signal received further.
Step S30, according to determined by described earphone external environment condition noise residing for tonal range, to institute State the audio signal of respective audio frequency range in external audio signal to be amplified processing.
As a example by low frequency signal section, intermediate-freuqncy signal section, high-frequency signal section, determining that current earphone uses When the noise medium and low frequency signal of environment is bigger, low in the corresponding audio signal adjusting reception circuit 101 reception Again and again the signal gain of section, to strengthen noise and the loudness contrast of earphone output audio frequency, so, user Low-frequency sound part in the sound heard is the clearest.It is understood that when current earphone uses The noise medium and low frequency signal of environment, intermediate-freuqncy signal, high-frequency signal the most clearly time, then will receive sound Frequently the basic, normal, high frequency signal in signal is all strengthened, and makes the audio signal relative noise that loudspeaker finally export Become apparent from, easily caught by user.And strengthen, by the frequency range of corresponding noise, the audio frequency received and believe The voice parts of corresponding frequency band in number, it is possible to make the user can be clear in the noisy environment of different frequency range Catch out the content or the audio content of external equipment input that partner speaks.
The descending noise-reduction method of the earphone that the present invention proposes, by when receiving external audio signal, detects The noise signal of earphone external environment condition, and determine described earphone external environment condition according to the noise signal detected The tonal range residing for noise, then according to determined by described earphone external environment condition noise residing for Tonal range, is amplified the audio signal of respective audio frequency range in described external audio signal processing, Make in the acoustical signal that earphone horn exports with noise with the reinforced partly of frequency range, thus improve earphone The definition of loudspeaker output sound, makes user can not hear clearly in the noisy environment of different frequency range Chu goes out content or the audio content of external equipment input that partner is spoken, and so, just improves The effect of descending noise reduction.
With reference to Fig. 5, in a preferred embodiment, above-mentioned steps S30 can be replaced step S30 ', described Step S30 ' specifically include:
When determining that the persistent period of noise of the described earphone external environment condition detected is more than predetermined threshold value, The then tonal range residing for noise of described earphone external environment condition determined by basis, to described external audio In signal, the audio signal of respective audio frequency range is amplified processing.
The noise of earphone external environment condition has random and continuous print, when for random noise, the most right The earphone signal received carries out noise reduction process, if continuous print just carries out noise reduction to the earphone signal received Process, this way it is possible to avoid the interference that noise reduction is controlled by random noise signal.Wherein it is possible to by obtaining Taking the noise measuring value in a period of time (preset time period), be averaged value to these noise measuring values Calculate, then this meansigma methods is compared with predetermined threshold value;When meansigma methods is more than predetermined threshold value, then sentence Earphone external environment condition before settled is in the most noisy environment, needs the earphone signal to receiving to carry out Noise reduction process;When meansigma methods is less than predetermined threshold value, the earphone signal received is not carried out noise reduction process. Certainly can realize in the way of using other, be not limiting as herein.
In a preferred embodiment, described step S30 also includes:
According to the noise level of the described earphone external environment condition detected, the described outside after reply is amplified mutually Audio signal carries out full frequency band audio frequency amplification.
In the earphone of this structure, by the audio signal of input to earphone horn is carried out full frequency band sound Frequency amplifies, and can the most again improve the loudness contrast of earphone horn output sound and noise, it is ensured that The sound that human ear is heard becomes apparent from.
With reference to Fig. 6, in further carrying out example, between described step S10 and step S20, described The descending noise-reduction method of earphone also includes:
Step S11, is amplified the noise signal detected processing.In the present embodiment, purpose is, improves The intensity of the noise signal detected, and then convenient control, and improve the precision of control.
In this embodiment, further, after performing described step S11, the descending fall of described earphone Method for de-noising also includes:
Step S12, is filtered the described noise signal after processing and amplifying processing.Filtered noise is believed Number purer, smooth, without noise jamming, it is more accurate that control is got up.
Preferably, described step S12 specifically includes to the high, medium and low frequency noise signal detected respectively It is filtered processing, to improve filter effect.
With reference to Fig. 7, in further carrying out example, the descending noise-reduction method of described earphone also includes:
Step S40, when receiving external audio signal, gathers the call voice of described earphone user, And export the voice signal of correspondence;
Step S50, is superimposed to after described voice signal is carried out reverse process outside the described earphone that detects On the noise signal of environment.
It should be noted that when using earphone call, the sound of user's call also can be detected, Purpose in the present embodiment is, eliminates the user's communication voice detected, user can be avoided to converse The interference of sound.Specifically, by gathering the call voice of described earphone user, and correspondence is exported Voice signal, is superimposed to the noise of earphone external environment condition after then speech detection signal being carried out reverse process On signal, so that it may so that voice signal after Fan Xiang with in the noise signal of the earphone external environment condition detected The acoustical signal of the user's call comprised offsets, it is achieved avoid the interference of user's call sound.
Referring also to Fig. 7, in further carrying out example, between described step S40 and step S50, institute The descending noise-reduction method stating earphone also includes:
Step S45, is amplified processing to the call voice signal of the described earphone user collected.Put Big process after be superimposed to again on the noise signal of described earphone external environment condition that detects, it is possible to increase gather The intensity of the human body voice signal of output, and then convenient control, and improve the precision of control.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, Every under the inventive concept of the present invention, utilize the equivalent structure that description of the invention and accompanying drawing content are made Conversion, or directly/be indirectly used in other relevant technical fields and be included in the patent protection model of the present invention In enclosing.

Claims (10)

1. a descending Dolby circuit for earphone, this earphone includes the reception for receiving external audio signal Circuit and for receive external audio signal be amplified and export to loudspeaker first audio frequency amplify electricity Road;It is characterized in that, the descending Dolby circuit of described earphone includes:
Environmental noise testing circuit, for when described reception circuit receives external audio signal, detects The noise signal of earphone external environment condition;
Frequency range determines circuit, for the noise signal detected according to described environmental noise testing circuit, really The tonal range residing for noise of fixed described earphone external environment condition;
Control circuit, for determining the noise of described earphone external environment condition that circuit determines according to described frequency range Residing tonal range, controls the outside sound that described reception circuit is received by described first audio amplifier circuit Frequently in signal, the audio signal of respective audio frequency range is amplified processing.
2. the descending Dolby circuit of earphone as claimed in claim 1, it is characterised in that described earphone is also Two stage gain amplifications defeated are carried out including the audio signal after being amplified by described first audio amplifier circuit Go out the second audio amplifier circuit to described loudspeaker;Described control circuit, is additionally operable to make an uproar according to described environment The noise level of the described earphone external environment condition that tone detection circuit detects, described second audio frequency of corresponding control Audio signal after described first audio amplifier circuit is amplified by amplifying circuit carries out full frequency band audio frequency amplification.
3. the descending Dolby circuit of earphone as claimed in claim 1, it is characterised in that described earphone Descending Dolby circuit also includes: the noise signal for described environmental noise testing circuit being detected is carried out First signal amplification circuit of processing and amplifying.
4. the descending Dolby circuit of earphone as claimed in claim 3, it is characterised in that described earphone Descending Dolby circuit also includes for being filtered the noise signal of described first signal amplification circuit output The filter circuit processed.
5. the descending Dolby circuit of earphone as claimed in claim 4, it is characterised in that described filtered electrical Road includes the signal input part for inputting noise measuring signal, for exporting filtered noise measuring letter Number signal output part, low-pass filter unit, bandpass filtering unit and high pass filter unit, described low pass The input of filter unit, bandpass filtering unit and high pass filter unit is connected with described signal input part, The outfan of described low-pass filter unit, bandpass filtering unit and high pass filter unit is respectively by a control Switch is connected with described signal output part;The control switch of described low-pass filter unit, described bandpass filtering The control switch controlling switch and described high pass filter unit of unit is connected with described control circuit respectively.
6. the descending Dolby circuit of the earphone as described in any one of claim 1 to 5, it is characterised in that The descending Dolby circuit of described earphone also includes:
Human body voice collecting circuit, for when receiving external audio signal, gathers described earphone and uses The call voice of person, and export the voice signal of correspondence;
Signal inversion circuit, is superimposed to described environment after described voice signal is carried out reverse process and makes an uproar On the noise signal of tone detection circuit detection output.
7. an earphone, it is characterised in that include the earphone as described in claim 1 to 6 any one Descending Dolby circuit.
8. the descending noise-reduction method of an earphone, it is characterised in that the method includes:
When receiving external audio signal, the noise signal of test earphone external environment condition;
According to the noise signal detected, determine the tonal range residing for noise of described earphone external environment condition;
The tonal range residing for noise of described earphone external environment condition determined by according to, to described outside sound Frequently in signal, the audio signal of respective audio frequency range is amplified processing.
9. the descending noise-reduction method of earphone as claimed in claim 8, it is characterised in that described according to institute The tonal range residing for noise of the described earphone external environment condition determined, to phase in described external audio signal The audio signal answering tonal range is amplified process and specifically includes:
When determining that the persistent period of noise of the described earphone external environment condition detected is more than predetermined threshold value, The then tonal range residing for noise of described earphone external environment condition determined by basis, to described external audio In signal, the audio signal of respective audio frequency range is amplified processing.
10. the descending noise-reduction method of earphone as claimed in claim 8 or 9, it is characterised in that described The descending noise-reduction method of earphone also includes:
When receiving external audio signal, gather the call voice of described earphone user, and export right The voice signal answered;
Making an uproar of the described earphone external environment condition being superimposed to after described voice signal is carried out reverse process to detect In tone signal.
CN201610353164.1A 2016-05-24 2016-05-24 Earphone, the downlink Dolby circuit of earphone and method Expired - Fee Related CN105872884B (en)

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WO2019084886A1 (en) * 2017-11-03 2019-05-09 深圳传音通讯有限公司 Audio denoising method and denoising device, mobile terminal and readable storage medium
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CN112700760A (en) * 2020-12-23 2021-04-23 新沂市承翔电子有限公司 Noise-reduction strong-sound electronic buzzer and control system and control method thereof
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
CN115665643A (en) * 2022-12-12 2023-01-31 杭州兆华电子股份有限公司 Method and system for evaluating active noise reduction effect of earphone

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