CN105049976B - A kind of method of noise reduction, earphone and terminal - Google Patents

A kind of method of noise reduction, earphone and terminal Download PDF

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Publication number
CN105049976B
CN105049976B CN201510456834.8A CN201510456834A CN105049976B CN 105049976 B CN105049976 B CN 105049976B CN 201510456834 A CN201510456834 A CN 201510456834A CN 105049976 B CN105049976 B CN 105049976B
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signal
earphone
terminal
frequency
noise reduction
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CN105049976A (en
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刘浩东
徐昌荣
朱顺吉
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The embodiment of the present invention provides method, earphone and the terminal of a kind of noise reduction, which includes: noise reduction microphone, for acquiring at least two-way noise signal；Signal processing circuit, at least two-way noise signal to be modulated to different frequency spectrums, acquisition frequency-division multiplex singal by this；Transmission circuit, the frequency-division multiplex singal is sent to terminal for the microphone pin by the earphone, the transmission circuit is also used to, and receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, and the de-noising signal is for this, at least two-way noise signal to carry out noise reduction；Loudspeaker, for playing the de-noising signal of terminal transmission.Therefore, in embodiments of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify the design of earphone, to improve the portability of earphone under the premise of realizing noise reduction.

Description

A kind of method of noise reduction, earphone and terminal
Technical field
The present embodiments relate to the communications fields, and a kind of method more particularly, to noise reduction, earphone and end End.
Background technique
Reducing three kinds of noise reduction measures generalling use of noise is, at sound source noise reduction, in communication process noise reduction and Noise reduction at human ear, wherein noise reduction is active mode at source of sound, its basic principle is: all sound is all by certain frequency Spectrum composition, if a kind of sound can be found, frequency spectrum and the noise to be eliminated are just the same, and only phase is just opposite (differing 180 °), so that it may fall this noise cancellation.
The key of noise reduction is that the sound for how obtaining that noise can be offset at source of sound, in current techniques, using master Noise reduction (Active Noise Canceling, referred to as " ANC ") earphone is moved to realize noise reduction, detailed process are as follows: first by disposing In the environmental noise that the microphone detecting ear in earphone can be heard；Noise signal is reached into Dolby circuit again, Dolby circuit into De-noising signal is calculated in row in real time；Obtained de-noising signal is issued from earphone with after playback Signal averaging, realization is made an uproar The inhibition of sound.
In existing ANC earphone, in addition to (there are also one on earphone used for mobile phone to lead to the playback loudspeaker as common headphones Words/recording microphone) except, it has in addition increased two noise reduction microphones in left and right newly and has gone to collect the noise of two ears of left and right, and will Data-signal for handling noise handles (Digital Signal Process, referred to as " DSP ") built-in chip type in earphone In, therefore be also required to consider the powerup issue, such as internal battery, charging chip and charging interface etc. of dsp chip.
Existing ANC earphone, due to needing to integrate dsp chip and battery, electricity for generating de-noising signal on earphone Source control module, that there are system designs is complicated, technology controlling and process higher cost when producing in enormous quantities, uses and maintain complexity, ear Body accumulates the drawbacks such as big.
Summary of the invention
The embodiment of the present invention provides method, earphone and the terminal of a kind of noise reduction, can under the premise of realizing noise reduction, The design for simplifying earphone, to improve the portability of earphone.
In a first aspect, providing a kind of earphone, which includes:
Noise reduction microphone, for acquiring at least two-way noise signal；
Signal processing circuit, at least two-way noise signal to be modulated to different frequency spectrums, acquisition frequency division multiplexing by this Signal；
Transmission circuit sends the frequency-division multiplex singal to terminal for the microphone pin by the earphone, transmitting-receiving electricity Road is also used to, and receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, the de-noising signal be used for this at least two Road noise acoustical signal carries out noise reduction；
The loudspeaker, for playing the de-noising signal of terminal transmission.
With reference to first aspect, in the first possible implementation of the first aspect, the earphone further include:
Power circuit, for obtaining the voltage that the terminal provides from the microphone pin, and according to the voltage to the noise reduction Microphone provides power supply.
With reference to first aspect or the first possible implementation of first aspect, second in first aspect are possible In implementation, which is specifically used for, and by this, at least two-way noise signal and reference clock signal are modulated to On different frequency spectrums, the frequency-division multiplex singal is obtained, the reference clock signal is for being aligned at least two-way noise signal.
With reference to first aspect and its above-mentioned implementation, in a third possible implementation of the first aspect, the ear Machine further include:
Call/recording microphone, for acquiring voice signal；
The signal processing circuit is specifically used for, by this at least two-way noise signal and the voice signal be modulated to it is different On frequency spectrum, the frequency-division multiplex singal is obtained.
With reference to first aspect and its above-mentioned implementation, in a fourth possible implementation of the first aspect, the ear Machine further include:
Noise reduction control circuit for determining whether the terminal supports active noise reduction, and is determining terminal support actively drop In the case where making an uproar, the control signal for being used to indicate acquisition noise signal is sent to the noise reduction microphone；
Wherein, which is specifically used for, and according to the control signal, acquires at least two-way noise signal.
The 4th kind of implementation with reference to first aspect, in the fifth possible implementation of the first aspect, the drop Control circuit of making an uproar is specifically used for, when the voltage that the terminal obtained from the microphone pin provides is more than preset voltage value, really The fixed terminal supports active noise reduction；
The transmission circuit is also used to, and by the microphone pin, is used to indicate the earphone to terminal transmission and is also supported to lead First previously arranged signal of dynamic noise reduction.
The 4th kind of implementation with reference to first aspect, in the sixth possible implementation of the first aspect,
The transmission circuit is also used to, and sends the second previously arranged signal for asking whether support active noise reduction to the terminal；
The transmission circuit is also used to, and receives the third previously arranged signal that the terminal is sent according to second previously arranged signal, this Three previously arranged signals are used to indicate the terminal and support active noise reduction；
The noise reduction control circuit is specifically used for, and according to the received third previously arranged signal of the transmission circuit, determines the terminal Support active noise reduction.
With reference to first aspect and its above-mentioned implementation, in a seventh possible implementation of the first aspect, the ear Machine further include:
Sensor, for acquiring sensor measurement signal；
The signal processing circuit is specifically used for, which is modulated to not On same frequency spectrum, the frequency-division multiplex singal is obtained.
With reference to first aspect and its above-mentioned implementation, in the 8th kind of possible implementation of first aspect, the drop Microphone of making an uproar is numeric type microphone, the earphone further include:
D/A converting circuit, the frequency-division multiplex singal for obtaining the signal processing circuit are handled as analog signal；
Wherein, which is specifically used for, and sends the analog signal to the terminal by the microphone pin.
With reference to first aspect and its above-mentioned implementation, in the 9th kind of possible implementation of first aspect, the frequency The protection bandwidth of division multiplex signal is not less than preset value.
With reference to first aspect and its above-mentioned implementation, in the tenth kind of possible implementation of first aspect, the receipts Power Generation Road is specifically used for, and while receiving the de-noising signal, also receives the useful audio signal of terminal transmission；
The loudspeaker is specifically used for, and while playing the de-noising signal, also plays the useful audio signal.
Second aspect provides a kind of terminal, which includes:
Transmission circuit receives the frequency-division multiplex singal that earphone is sent for the microphone interface by terminal, wherein the frequency Division multiplex signal is by the way that at least two-way noise signal of the noise reduction microphone acquisition on the earphone is modulated to different frequency spectrums On get, which connect with the microphone pin of the earphone；
Signal processing circuit obtains at least two-way noise signal for demodulating the frequency-division multiplex singal；
Dolby circuit, for according to the signal processing circuit determine this at least two-way noise signal generate de-noising signal, The de-noising signal is for this, at least two-way noise signal to carry out noise reduction；
The transmission circuit is also used to, and sends the de-noising signal to the earphone.
In conjunction with second aspect, in the first implementation of second aspect, the frequency-division multiplex singal be by by this extremely Few two-way noise signal and reference clock signal are modulated to be got on different frequency spectrums, the reference clock signal for pair The neat at least two-way noise signal；
The signal processing circuit is also used to, and obtains the reference clock signal by demodulating the frequency-division multiplex singal, and according to The reference clock signal is aligned at least two-way noise signal.
In conjunction with second aspect and its above-mentioned implementation, in second of implementation of second aspect, the frequency division multiplexing Signal is by the way that the voice signal that at least two-way noise signal is acquired with the call on the earphone/recording microphone to be modulated to It is got on different frequency spectrums；
Signal processing circuit is also used to, and obtains the voice signal by demodulating the frequency-division multiplex singal；
The terminal further include:
Speed signal processing circuit, for handling the voice signal.
In conjunction with second aspect and its above-mentioned implementation, in the third implementation of second aspect, which is also wrapped It includes:
Control circuit, for passing through the microphone interface of the terminal in the case where determining that the earphone supports active noise reduction Continue to provide the voltage more than preset voltage value to the earphone.
In conjunction with the third implementation of second aspect, in the 4th kind of implementation of second aspect,
The control circuit is specifically used for, and when the terminal is connect with earphone, passes through the wheat of the terminal within a preset period of time Gram wind interface provided to the earphone be more than preset voltage value voltage；
The transmission circuit is also used to, and receives the first agreement for being used to indicate the earphone and supporting active noise reduction of earphone transmission Signal；
The control circuit is used for, and according to first previously arranged signal, determines that the earphone supports active noise reduction.
In conjunction with the third implementation of second aspect, in the 5th kind of implementation of second aspect, the transmission circuit It is specifically used for, before receiving the frequency-division multiplex singal, receive earphone transmission is used to ask whether support active noise reduction The second previously arranged signal；
The control circuit is used for, and according to second previously arranged signal, determines that the earphone supports active noise reduction；
The transmission circuit is also used to, and is sent to the earphone and is used to indicate the third agreement letter that the terminal supports active noise reduction Number.
In conjunction with second aspect and its above-mentioned implementation, in the 6th kind of implementation of second aspect, the frequency division multiplexing Signal is by the way that the sensor measurement signal of the sensor acquisition on this at least two-way noise signal and the earphone to be modulated to not It is got on same frequency spectrum；
Signal processing circuit is also used to, and by demodulating the frequency-division multiplex singal, obtains the sensor measurement signal；
The terminal further include:
Sensor signal processing circuit, for handling the sensor measurement signal.
In conjunction with second aspect and its above-mentioned implementation, in the 7th kind of implementation of second aspect, the transmission circuit The received frequency-division multiplex singal is analog signal；
The signal processing circuit is specifically used for, and before demodulating the frequency-division multiplex singal, carries out to the frequency-division multiplex singal Analog-to-digital conversion process obtains corresponding digital signal.
In conjunction with second aspect and its above-mentioned implementation, in the 8th kind of implementation of second aspect, the frequency division multiplexing The protection bandwidth of signal is not less than preset value.
In conjunction with second aspect and its above-mentioned implementation, in the 9th kind of implementation of second aspect, the transmission circuit It is specifically used for, when sending the de-noising signal to the terminal, also sends useful audio signal to the terminal.
The third aspect provides a kind of method of noise reduction, this method comprises:
Pass through the noise reduction microphone acquisition at least two-way noise signal on earphone；
By this, at least two-way noise signal is modulated on different frequency spectrums, obtains frequency-division multiplex singal；
The frequency-division multiplex singal is sent to terminal by the microphone pin of the earphone；
The de-noising signal that the terminal is sent according to the frequency-division multiplex singal is received, which is used for at least two-way Noise signal carries out noise reduction；
Play the de-noising signal of terminal transmission.
In conjunction with the third aspect, in the first implementation of the third aspect, by this, at least two-way noise signal is modulated for this Onto different frequency spectrums, frequency-division multiplex singal is obtained, comprising:
By this, at least two-way noise signal and reference clock signal are modulated on different frequency spectrums, obtain the frequency division multiplexing Signal, the reference clock signal is for being aligned at least two-way noise signal.
In conjunction with the third aspect and its above-mentioned implementation, in second of implementation of the third aspect, this method is also wrapped It includes:
Voice signal is acquired by the call on the earphone/recording microphone；
By this, at least two-way noise signal is modulated on different frequency spectrums for this, obtains frequency-division multiplex singal, comprising:
At least two-way noise signal and the voice signal is modulated on different frequency spectrums, frequency division multiplexing letter is obtained Number.
In conjunction with the third aspect and its above-mentioned implementation, in the third implementation of the third aspect, this passes through earphone On noise reduction microphone acquisition at least two-way noise signal, comprising:
Determine whether the terminal supports active noise reduction；
Determine the terminal support active noise reduction in the case where, by the noise reduction microphone on the earphone acquire this at least two Road noise acoustical signal.
In conjunction with the third implementation of the third aspect, in the 4th kind of implementation of the third aspect, the determination end Whether active noise reduction is supported in end, comprising:
When the voltage that the terminal obtained from the microphone pin provides is more than preset voltage value, determine that the terminal is supported Active noise reduction；
This method further include:
By the microphone pin, is sent to the terminal and be used to indicate the first agreement letter that the earphone also supports active noise reduction Number.
In conjunction with the third implementation of the third aspect, in the 5th kind of implementation of the third aspect, the determination end Whether active noise reduction is supported in end, comprising:
The second previously arranged signal for asking whether support active noise reduction is sent to the terminal；
The third previously arranged signal that the terminal is sent according to second previously arranged signal is received, which is used to indicate The terminal supports active noise reduction；
According to the third previously arranged signal, determine that the terminal supports active noise reduction.
In conjunction with the third aspect and its above-mentioned implementation, in the 6th kind of implementation of the third aspect, this method is also wrapped It includes:
Sensor measurement signal is acquired by the sensor on the earphone；
By this, at least two-way noise signal is modulated on different frequency spectrums for this, obtains frequency-division multiplex singal, comprising:
At least two-way noise signal is modulated on different frequency spectrums from the sensor measurement signal, it is multiple to obtain the frequency division Use signal.
In conjunction with the third aspect and its above-mentioned implementation, in the 7th kind of implementation of the third aspect, noise reduction Mike Wind is numeric type microphone, should send the frequency-division multiplex singal to terminal by the microphone pin of the earphone, comprising:
The frequency-division multiplex singal is subjected to digital-to-analogue conversion, obtains the corresponding analog signal of the frequency-division multiplex singal；
The frequency-division multiplex singal after the digital-to-analogue conversion is sent to the terminal by the microphone pin.
In conjunction with the third aspect and its above-mentioned implementation, in the 8th kind of implementation of the third aspect, the frequency division multiplexing The protection bandwidth of signal is not less than preset value.
In conjunction with the third aspect and its above-mentioned implementation, in the 9th kind of implementation of the third aspect, the reception end Hold the de-noising signal sent according to the frequency-division multiplex singal, comprising:
The de-noising signal that the terminal is sent according to the frequency-division multiplex singal is received, and receives the useful audio of terminal transmission Signal；
The de-noising signal that the broadcasting terminal is sent, comprising:
The de-noising signal is played, and plays the useful audio signal.
Fourth aspect provides a kind of method of noise reduction, this method comprises:
The frequency-division multiplex singal that earphone is sent is received by the microphone interface of terminal, wherein the frequency-division multiplex singal is It is got on different frequency spectrums by the way that at least two-way noise signal of the noise reduction microphone acquisition on the earphone to be modulated to, it should Microphone interface is connect with the microphone pin of the earphone；
It demodulates the frequency-division multiplex singal and obtains at least two-way noise signal；
According to this, at least two-way noise signal generates de-noising signal, which is used for at least two-way noise signal Carry out noise reduction；
The de-noising signal is sent to the earphone.
In conjunction with fourth aspect, in the first implementation of fourth aspect, the frequency-division multiplex singal be by by this extremely Few two-way noise signal and reference clock signal are modulated to be got on different frequency spectrums, the reference clock signal for pair The neat at least two-way noise signal；
This method further include:
By demodulating the frequency-division multiplex singal, the reference clock signal is obtained, and should according to reference clock signal alignment At least two-way noise signal；
According to this, at least two-way noise signal generates de-noising signal, comprising:
According to this after alignment, at least two-way noise signal generates the de-noising signal.
In conjunction with fourth aspect and its above-mentioned implementation, in second of implementation of fourth aspect, the frequency division multiplexing Signal is by the way that the voice signal that at least two-way noise signal is acquired with the call on the earphone/recording microphone to be modulated to It is got on different frequency spectrums；
This method further include:
By demodulating the frequency-division multiplex singal, the voice signal is obtained；
The voice signal is handled by the speed signal processing circuit of the terminal.
In conjunction with fourth aspect and its above-mentioned implementation, in the third implementation of fourth aspect, this method is also wrapped It includes:
Determine whether the earphone supports active noise reduction；
In the case where determining that the earphone supports active noise reduction, continue to mention to the earphone by the microphone interface of the terminal For being more than the voltage of preset voltage value.
In conjunction with the third implementation of fourth aspect, in the 4th kind of implementation of fourth aspect, the determination ear Whether machine supports active noise reduction, comprising:
When the terminal is connect with earphone, provided within a preset period of time by the microphone interface of the terminal to the earphone More than the voltage of preset voltage value；
Receive the first previously arranged signal for being used to indicate the earphone and supporting active noise reduction that the earphone is sent according to the voltage；
According to first previously arranged signal, determine that the earphone supports active noise reduction.
In conjunction with the third implementation of fourth aspect, in the 5th kind of implementation of fourth aspect, the determination ear Whether machine supports active noise reduction, comprising:
Receive the second previously arranged signal for being used to ask whether to support active noise reduction of earphone transmission；
According to second previously arranged signal, determine that the earphone supports active noise reduction；
The third previously arranged signal for being used to indicate the terminal and supporting active noise reduction is sent to the earphone.
In conjunction with fourth aspect and its above-mentioned implementation, in the 6th kind of implementation of fourth aspect, the frequency division multiplexing Signal is by the way that the sensor measurement signal of the sensor acquisition on this at least two-way noise signal and the earphone to be modulated to not It is got on same frequency spectrum；
This method further include:
By demodulating the frequency-division multiplex singal, the sensor measurement signal is obtained；
The sensor measurement signal is handled by the sensor signal processing circuit of the terminal.
In conjunction with fourth aspect and its above-mentioned implementation, in the 7th kind of implementation of fourth aspect, which is sent The frequency-division multiplex singal be analog signal；
The demodulation frequency-division multiplex singal obtains at least two-way noise signal, comprising:
Analog-to-digital conversion process is carried out to the frequency-division multiplex singal and obtains corresponding digital signal；
Demodulation obtains at least two-way noise signal by the frequency-division multiplex singal after analog-to-digital conversion.
In conjunction with fourth aspect and its above-mentioned implementation, in the 8th kind of implementation of fourth aspect, the frequency division multiplexing The protection bandwidth of signal is not less than preset value.
In conjunction with fourth aspect and its above-mentioned implementation, in the 9th kind of implementation of fourth aspect, this is to the earphone Send the de-noising signal, comprising:
The de-noising signal and useful audio signal are sent to the earphone.
5th aspect provides a kind of system of noise reduction, which includes the earphone that above-mentioned first aspect provides and upper The terminal of second aspect offer is provided.
Based on the above-mentioned technical proposal, in embodiments of the present invention, in earpiece side acquisition noise signal, noise signal is sent To terminal side；Noise reduction process is carried out in terminal side, generates for the de-noising signal to noise signal noise reduction, de-noising signal is sent It to earphone, is played out by the loudspeaker of earphone, to realize noise reduction.Therefore, in embodiments of the present invention, it is not necessarily in earphone Dolby circuit is set, the design of earphone can be simplified, to improve the portability of earphone under the premise of realizing noise reduction.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention Example is applied, it for those of ordinary skill in the art, without any creative labor, can also be attached according to these Figure obtains other attached drawings.
Fig. 1 shows the schematic block diagram of the earphone provided according to embodiments of the present invention.
Fig. 2 shows another schematic block diagrams of the earphone of offer according to embodiments of the present invention.
Fig. 3 show the present embodiments relate to noise signal carry out frequency division multiplexing schematic diagram.
Fig. 4 shows another schematic block diagram of the earphone provided according to embodiments of the present invention.
Fig. 5 shows another schematic block diagram of the earphone provided according to embodiments of the present invention.
Fig. 6 shows another schematic block diagram of the earphone provided according to embodiments of the present invention.
Fig. 7 shows the schematic flow chart of the method for the noise reduction provided according to embodiments of the present invention.
Fig. 8 shows another schematic flow chart of the method for the noise reduction provided according to embodiments of the present invention.
Fig. 9 shows another schematic block diagram of the earphone provided according to embodiments of the present invention.
Figure 10 shows another schematic block diagram of the earphone provided according to embodiments of the present invention.
Figure 11 shows the schematic block diagram of the terminal provided according to embodiments of the present invention.
Figure 12 shows another schematic flow chart of the method for the noise reduction provided according to embodiments of the present invention.
Figure 13 shows another schematic flow chart of the method for the noise reduction provided according to embodiments of the present invention.
Figure 14 shows the schematic block diagram of the system of the noise reduction provided according to embodiments of the present invention.
Figure 15 shows another schematic block diagram of the system of the noise reduction provided according to embodiments 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 embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall within the protection scope of the present invention.
The present embodiments relate to earphone, including earpiece (also referred to as earplug or earmuff) includes loudspeaking in earpiece Device.Earphone is connect by earphone cable with terminal, for example, earphone cable includes four-part form pin, which can be inserted end The four-part form audio interface at end.
The present embodiments relate to terminal can be various audiogenic devices, and the terminal includes four-part form audio interface, After connecting with the four-part form pin of earphone, power supply can be provided for earphone, drive the loudspeaker (also referred to as loudspeaker) of earphone And microphone, the four-part form audio interface are, for example, active 3.5mm jack.Specifically, which can be portable or desk-top Electronic equipment, such as the various handheld terminals such as can be mobile phone, tablet computer, music player or recorder, are not limited solely to Communication terminal.
It should also be understood that noise signal involved in the embodiment of the present invention is specially intermediate frequency and low-frequency noise signal, this frequency Section contains the daily most of noise faced of user, such as the repeatability of most typical aeroengine or train, subway Noise etc..
Fig. 1 shows the schematic block diagram of the earphone 100 provided according to embodiments of the present invention, as shown in Figure 1, the earphone 100 include:
Noise reduction microphone 110, for acquiring at least two-way noise signal；
It is multiple to obtain frequency division for at least two-way noise signal to be modulated to different frequency spectrums for signal processing circuit 120 Use signal；
Transmission circuit 130 sends the frequency-division multiplex singal to terminal for the microphone pin by the earphone, the transmitting-receiving Circuit 130 is also used to, and receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, which is used for this extremely Few two-way noise signal carries out noise reduction；
Loudspeaker 140, for playing the de-noising signal of terminal transmission.
In embodiments of the present invention, in earpiece side acquisition noise signal, noise signal is sent to terminal side；In terminal side Noise reduction process is carried out, generates for the de-noising signal to noise signal noise reduction, de-noising signal is sent to earphone, by raising for earphone Sound device plays out, to realize noise reduction.Therefore, in embodiments of the present invention, no setting is required in earphone Dolby circuit, can Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
It is to believe multipath noise during earphone is to terminal transmitted noise signal in addition, in embodiments of the present invention Number processing is frequency-division multiplex singal all the way, is sent to the frequency-division multiplex singal using the corresponding channel of the microphone pin of earphone Terminal side carries out subsequent processing, and the embodiment of the present invention realizes while on the basis of traditional four-section type headset pin to end End sends multipath noise signal, can be improved the effect of noise reduction.
It should be understood that the noise reduction microphone (hereinafter referred to as MIC) 110 is used to acquire making an uproar for the ambient enviroment that ear can be heard Acoustical signal, specifically, the noise reduction microphone 110 are used to acquire the noise signal within the scope of predeterminated frequency, to realize to different frequencies The ambient noise of section carries out the elimination or shielding of selectivity.
It should also be understood that the noise reduction microphone 110 is arranged on earphone, specifically, the left and right earpiece of earphone can be arranged in Near, or be integrated in the earpiece of left and right, it include loudspeaker in earpiece, specifically, if the schematic diagram of earphone 200 shown in 2. Specifically, such as the noise reduction microphone is that two noise reductions MIC, one of noise reduction MIC are distributed in the outside of the left earpiece of earphone, separately One noise reduction MIC is distributed in the outside of the right earpiece of earphone.Again alternatively, as shown in Fig. 2, the noise reduction microphone is four noise reductions MIC, the outside and inside that two of them noise reduction MIC is respectively distributed to the left earpiece of earphone are (i.e. between headset earpiece and ear Space), another two noise reduction MIC is respectively distributed to the outside and inside of the right earpiece of earphone.It should also be understood that in the embodiment of the present invention In, which can also include greater number of noise reduction MIC, and part of noise reduction MIC is distributed near left earpiece, Another part noise reduction MIC is distributed near right earpiece.It should also be understood that acquiring ambient noise using greater number of noise reduction MIC Signal can more comprehensively obtain the periotic ambient noise of people, so that subsequent can be better achieved noise reduction.
Further, the noise reduction MIC being distributed in inside earpiece is also used to obtain what the earpiece after noise reduction process played Audio signal is adjusted for feeding back to signal needed for subsequent noise reduction algorithm so that noise reduction algorithm can carry out corresponding dynamic And signal estimation.
It should also be understood that in embodiments of the present invention, only noise signal all the way can also be obtained using a noise reduction MIC.Example Such as, it is mounted with that a noise reduction MIC, such as noise reduction MIC are located at apart from left earpiece and right earpiece apart from identical position on earphone. By this, noise signal is sent to terminal to earphone all the way, and terminal generates noise reduction letter identical as the noise amplitude signal, opposite in phase Number, earphone receives the de-noising signal that terminal is sent, and is equivalent to left and right earpiece and receives same de-noising signal, it should be appreciated that It is that by decrease of noise functions.
It should also be understood that the earphone in the embodiment of the present invention can be In-Ear earphone, it is also possible to headphone.It is right It answers, the earpiece of earphone is also referred to as earplug or earmuff.The earpiece of In-Ear earphone is earplug, the earpiece of headphone It can be referred to as earmuff.
Specifically, Fig. 2 shows the schematic diagrames of headphone 200, as shown in Fig. 2, the earphone 200 includes:
Noise reduction microphone 210, for the ambient noise signal around acquiring, specifically, acquisition at least two-way noise signal, Specifically, Fig. 2 schematically provides four noise reduction MIC, and two of them are located at the outside and inside of left earpiece, other two is located at The outside and inside of right earpiece.Optionally, in embodiments of the present invention, which also can integrate in headset earpiece It is interior.
Left and right earpiece 220 is used for playing audio signal, respectively includes loudspeaker (also referred to as in the left and right earpiece 220 Loudspeaker).It should be understood that loudspeaker 140 shown in FIG. 1 is arranged in headset earpiece.
Signal processing circuit 230 is processed into all the way for handling the noise signal of the acquisition of noise reduction microphone 210 Frequency-division multiplex singal is sent to terminal by the microphone pin of earphone cable 240.
Earphone cable 240, one end of earphone cable 240 include four-part form pin 250, which includes L channel L Pin, right channel R pin, ground connection G pin and microphone M pin.
Earphone is connect by the four-part form pin 250 of earphone cable with terminal, specifically, the four-part form pin 250 for The four-part form audio interface of terminal connects, and terminal passes through L channel L pin, right channel R pin and the driving of microphone M pin respectively The left and right loudspeaker and microphone of earphone, specifically, in the figure 2 example, terminal by M pin drive four noise reduction microphones with An and call/recording microphone.
It should be understood that the noise reduction microphone 110 in the embodiment of the present invention corresponds to the noise reduction microphone 210 in Fig. 2, loudspeaker 140 correspond to the loudspeaker for including in earpiece 220 shown in Fig. 2.Transmission circuit 130 is specifically pass through four-part form pin 250 M pin to terminal send frequency division composite signal, and pass through M pin receive terminal send de-noising signal.The present invention is implemented Signal processing circuit 120 in example can correspond to signal processing circuit 230 shown in Fig. 2.
It should also be understood that Fig. 2 is merely illustrative and non-limiting, for example, four-part form pin shown in Figure 2 successively include L pin, R pin, G pin and M pin, wherein the sequence of G pin and M pin can also exchange, and the embodiment of the present invention does not limit this It is fixed.
Signal processing circuit 120 be used to acquire noise reduction microphone this at least two-way noise signal is modulated to different frequencies In spectrum, frequency-division multiplex singal is obtained.At least two-way noise signal is modulated on different frequency spectrums for this, obtains frequency-division multiplex singal. Specifically, information is distributed according to default frequency spectrum, at least two-way noise signal is modulated on different frequency spectrums by this, obtains the frequency division Multiplexed signals, which includes the corresponding relationship for needing the signal and Reusespectrum that are multiplexed.For example, will at least Two-way noise signal is modulated to the process of frequency-division multiplex singal are as follows: by the first via noise signal A at least two-way noise signal It is modulated on the first sub-band of Reusespectrum by the frequency spectrum a where noise signal A script, by the second road noise acoustical signal B by making an uproar Frequency spectrum b where acoustical signal B script is modulated on the second sub-band of Reusespectrum.In the present embodiment, specifically, this is default Frequency spectrum distribution information includes the corresponding relationship of frequency spectrum a and the first sub-band and the corresponding pass of frequency spectrum b and the second sub-band System.Accordingly, in terminal side, frequency spectrum distribution information is preset according to this, frequency-division multiplex singal is demodulated, specifically, to this The signal on the first sub-band in frequency-division multiplex singal is demodulated, i.e., the signal on the first sub-band is restored to frequency spectrum a On, to obtain first via noise signal A；Signal on second sub-band is demodulated, i.e., it will be on second sub-band Signal be restored on frequency spectrum b, to obtain the second road noise acoustical signal B.
It should also be understood that in embodiments of the present invention, at least two-way noise signal that noise reduction microphone acquires is modulated to It on different frequency spectrums, refers specifically to, by this, at least two-way noise signal is modulated to the corresponding channel of microphone pin of earphone Spectral range different frequency spectrums on.
Specifically, such as the noise reduction microphone 110 is four noise reduction microphones, arrangement such as Fig. 2 institute on earphone Show, i.e., this at least two-way noise signal is four road noise acoustical signals, respectively by being located at left horn inside, outside, on the inside of right horn, outside The noise reduction MIC acquisition noise signal of side, it is assumed that the data of every road noise acoustical signal are only limitted to 2.5kHz band in the four road noises acoustical signal Data within width, then the concrete condition for four road noises acoustical signal progress frequency spectrum distribution is as shown in Figure 3:
The de-noising signal (signal 2 as shown in Figure 3) acquired of noise reduction MIC on the outside of left horn is assigned to: 28kHz~ 34kHz；
The de-noising signal (signal 3 as shown in Figure 3) of noise reduction MIC acquisition on the inside of left horn is assigned to: 38kHz~ 44kHz；
The de-noising signal (signal 4 as shown in Figure 3) acquired of noise reduction MIC on the outside of right horn is assigned to: 48kHz~ 54kHz；
The de-noising signal (signal 5 as shown in Figure 3) of noise reduction MIC acquisition on the inside of right horn is assigned to: 58kHz~ 64kHz。
Optionally, in embodiments of the present invention, the protection bandwidth of the frequency-division multiplex singal is not less than preset value.
Specifically, which can be arranged according to specific requirements, such as the protection bandwidth of the frequency-division multiplex singal is 4kHz, the embodiment of the present invention are not construed as limiting this.
It should be understood that the protection bandwidth of frequency-division multiplex singal refers to the frequency in the multiplexed signals between adjacent two paths of signals Spectrum interval, the protection bandwidth can guarantee that the signal of the transmission on different frequency range is not interfere with each other.Specifically, as shown in figure 3, for example Protection bandwidth per the data of signal all the way is set not less than 4kHz.
Transmission circuit 130 is used for, and receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, the de-noising signal For to this, at least two-way noise signal to carry out noise reduction.
It should be understood that terminal can recover at least two-way noise signal, Jin Ersheng by demodulating the frequency-division multiplex singal At corresponding de-noising signal.
Specifically, for example, it is assumed that in earpiece side, at least two-way noise signal is modulated to the process of frequency-division multiplex singal Are as follows: the first via noise signal A at least two-way noise signal is modulated to first by the frequency spectrum a where noise signal A script On sub-band, the second road noise acoustical signal B is modulated on the second sub-band by the frequency spectrum b where noise signal B script.In terminal Side demodulates the frequency-division multiplex singal, specifically, carries out to the signal on the first sub-band in the frequency-division multiplex singal Signal on first sub-band, i.e., be restored on frequency spectrum a, to obtain first via noise signal A by demodulation；To the second son frequency The signal taken is demodulated, i.e., the signal on second sub-band is restored on frequency spectrum b, to obtain the second road noise sound Signal B.
Terminal demodulates carry out at least two-way noise signal after, generate, the drop of opposite in phase identical as the noise amplitude signal The noise signal can be cut down or even be offset to noise cancellation signal, the i.e. de-noising signal.
It should be noted that assuming that the first via noise signal A at least two-way noise signal is around the left earpiece of earphone Noise signal, the second road noise acoustical signal B at least in two-way noise signal is the noise signal around the right earpiece of earphone.It is optional Ground, terminal can generate L channel de-noising signal based on first via noise signal A, generate right sound based on the second road noise acoustical signal B Road de-noising signal.
Optionally, terminal can also be based on at least two-way noise signal, generate a de-noising signal, then will be same De-noising signal is used as L channel de-noising signal and right channel de-noising signal simultaneously.
Optionally, in embodiments of the present invention, which is specifically used for, and by this, at least two-way noise is believed Number and reference clock signal be modulated on different frequency spectrums, obtain the frequency-division multiplex singal, the reference clock signal for pair The neat at least two-way noise signal.
For example, this at least two-way noise signal includes that two noise reduction microphones being arranged near the left earpiece of earphone acquire Two-way noise signal, the two-way noise signal is after spectrum modulation, it is possible to because modulation algorithm error etc. brings phase inclined Difference, i.e., in frequency-division multiplex singal, there are phase deviations for this two-way noise signal.Terminal receives the frequency-division multiplex singal, And this two-way noise signal obtained after the demodulation is also there are phase deviation, will lead to cannot generate accurate noise reduction letter Number.In order to avoid this problem, when earpiece side carries out frequency division multiplexing processing to multipath noise signal, that is, reference clock letter is provided Number so that terminal when demodulating frequency-division multiplex singal according to the reference clock signal, can be to there are the noise of phase deviation letters It number is modified, to obtain accurate de-noising signal.
Specifically, as shown in figure 3, reference clock signal (signal 6 as shown in Figure 3) is assigned to: 70kHz.
It should be understood that Fig. 3 is merely illustrative and non-limiting, and in actual operation, the protection bandwidth used during frequency division multiplexing And the Frequency point of each road signal can be adjusted accordingly according to algorithm requirements, not being here is to obligate.
Optionally, in embodiments of the present invention, the noise reduction transmission circuit 130 is specifically used for, and is receiving the de-noising signal Meanwhile also receiving the useful audio signal of terminal transmission；
The loudspeaker 140 is specifically used for, and while playing the de-noising signal, also plays the useful audio signal.
It should be understood that the useful audio signal is the audio signal that user needs to listen to, for example, the useful audio signal is sound The audio signals such as happy or speech signal.To which headset earpiece plays out the de-noising signal and useful audio signal, user It can hear more pure music or speech signal.
Optionally, in embodiments of the present invention, the earphone 100 further include:
Clock circuit, for providing reference clock signal to noise reduction microphone 110, so that multiple noise reduction microphones are based on phase Same reference clock signal acquires at least two-way noise signal.
Optionally, as shown in figure 4, in embodiments of the present invention, the earphone 100 further include:
Power circuit 150, for obtaining the voltage that the terminal provides from the microphone pin, and according to the voltage to the drop Microphone of making an uproar provides power supply.
Specifically, shown in Fig. 2 for earphone, which is used for the Mike from the four-part form pin of earphone cable Wind pin (hereinafter referred to as M pin) obtains the voltage (specifically, can be referred to as microphone bias voltage) that terminal provides, the electricity Source circuit 150 provides power supply to noise reduction microphone 110 based on the voltage obtained from terminal, i.e., for driving noise reduction microphone 110.
It should be understood that the power circuit 150 is also used for powering to signal processing circuit 120.
Specifically, which is the power supply circuit in the signal processing circuit 120.
In embodiments of the present invention, earpiece side is responsible for acquisition noise signal, is sent to terminal side and carries out noise reduction process, because This, earpiece side is not necessarily to solve the powerup issue of Dolby circuit naturally without arranging Dolby circuit；Secondly, in the embodiment of the present invention Using four-section type headset pin, terminal can use to the power supply of the microphone pin in four-part form pin to drive noise reduction Microphone and signal processing circuit for frequency division multiplexing processing, to eliminated inside earphone with larger volume and weight Power module simplifies the design of earphone, has simplified the volume of earphone, can reduce earphone manufacturing cost and maintenance at This, also can be improved the portability of earphone.
It should be understood that in embodiments of the present invention, which may be handset earphone, that is, include call/recording MIC ( It can be referred to as chest wheat).It when user uses the call/recording MIC, such as records or converses with other users, at least It also include to call/recorded audio signals frequency division multiplexing when two-way noise signal carries out frequency division multiplexing processing.
Optionally, as shown in figure 5, in embodiments of the present invention, the earphone 100 further include:
Call/recording microphone 160, for acquiring voice signal；
The signal processing circuit 120 is specifically used for, which is modulated to not On same frequency spectrum, the frequency-division multiplex singal is obtained.
Specifically, which is, for example, microphone 260 shown in Fig. 2, also referred to as chest wheat Perhaps headset is used for user's communication or recording.
The signal processing circuit 120 is specifically used for, by voice signal together at least two-way noise signal frequency division multiplexing, really It is set to multiplexed signals all the way, it is assumed that the bandwidth of operation of the data of call/recording MIC output voice signal is 20kHz, for call Or the frequency spectrum of the data distribution of the voice signal of recording MIC output are as follows: 0~24kHz, the frequency spectrum as in Fig. 3 being the distribution of signal 1. As described above for noise signal distribution frequency spectrum, which is not described herein again.
It should be understood that in embodiments of the present invention, earphone passes through frequency-division multiplex singal for call/recorded audio signals and multipath noise Signal is sent to terminal together, accordingly, in terminal side by demodulating to frequency-division multiplex singal, it is logical can to recover this Words/recorded audio signals and multipath noise signal carry out noise reduction process for noise signal, call/recorded audio signals are sent to phase The audio-frequency signal processing module of pass, such as codec chip are handled.Therefore, in embodiments of the present invention, active noise reduction is realized While, it will not influence the business of user's normal use call/recording microphone point, two kinds of events can carry out simultaneously, mutually not Interference, so as to improve satisfaction of users.
It should also be understood that in embodiments of the present invention, earphone includes two kinds of operating modes, one is normal mode of operation, one Kind is noise reduction operating mode.Wherein, in a normal mode of operation, earphone does not have decrease of noise functions, i.e., receives audio from terminal merely Signal is played out from earpiece, will not provide the terminal with noise signal, and specifically, the noise reduction MIC in earphone will not work.? Under noise reduction operating mode, earphone is powered to noise reduction MIC, noise reduction MIC work, acquisition noise signal, and carries out frequency to noise signal Divide multiplexing process, multiplexed signals is sent to terminal by treated.
Earphone is in the case where determining that terminal supports active noise reduction, Cai Huikai noise reduction operating mode, is otherwise in unskilled labor Operation mode.
Optionally, as shown in fig. 6, in embodiments of the present invention, the earphone 100 further include:
Noise reduction control circuit 170 for determining whether the terminal supports active noise reduction, and is determining terminal support actively In the case where noise reduction, the control signal for being used to indicate acquisition noise signal is sent to the noise reduction microphone；
Wherein, which is specifically used for, and according to the control signal, acquires at least two-way noise signal.
Specifically, the signal made an appointment between earphone and terminal by transmission, to inform whether other side oneself supports to lead Dynamic noise reduction.
Optionally, in embodiments of the present invention, which is specifically used for, and obtains when from the microphone pin When the voltage that the terminal taken provides is more than preset voltage value, determine that the terminal supports active noise reduction；
The transmission circuit 130 is also used to, and by the microphone pin, is used to indicate the earphone to terminal transmission and is also supported First previously arranged signal of active noise reduction.
Specifically, after earphone is connect with terminal, terminal is lifted the MIC bias voltage to earphone, for example, common headphones Default MIC bias voltage value is 2.7v (corresponding to the preset voltage value in the embodiment of the present invention), the end in the embodiment of the present invention It is 5V that end, which is the MIC bias voltage that earphone provides,.When headset detection to be more than preset voltage value MIC voltage value when, determine pair End terminal can support active noise reduction.
It should also be understood that terminal also has noise reduction operating mode and normal mode of operation, and terminal is also in the embodiment of the present invention In the case where determining that opposite end earphone supports active noise reduction, noise reduction operating mode is opened, is otherwise in normal mode of operation.Cause This, after earphone determines that distant terminal supports active noise reduction function according to the MIC bias voltage for being more than preset voltage value, it is also necessary to It sends to distant terminal for indicating that the earphone can support decrease of noise functions, and instruction terminal opens the first of noise reduction operating mode Reservation signal.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.It should be understood that first reservation signal is all well known for earphone and terminal.
Specifically, taking the terminal as an example, in conjunction with Fig. 7, the handshake procedure in S161 is described from the angle of mobile phone, In S11, mobile phone detects that four-section type headset is in place, i.e., mobile phone has connected with earphone；In S12, mobile phone passes through four-part form audio Interface provides the MIC bias voltage of 5V to earphone, it should be appreciated that for common headphones (i.e. the not earphone of decrease of noise functions), mobile phone The MIC bias voltage of 2.7V need to be only provided；In S13, mobile phone open recording channel to audio signal processing circuit starts to detect Previously arranged signal；In S14, mobile phone judges whether to receive previously arranged signal, and specifically, which is that 1k, 8k or 16k are this The clean audio signal that nature does not have very much goes to S15, otherwise goes to S16 when determining receive；In S15, root According to the previously arranged signal that earphone is sent, determines that the earphone supports active noise reduction, then persistently protect the MIC bias voltage provided for earphone It holds in 5V, and enters noise reduction operating mode.
Specifically, taking the terminal as an example, in conjunction with Fig. 8, the handshake procedure in S161 is described from the angle of earphone, In S21, the four-part form audio interface of the four-part form pin insertion mobile phone of earphone, i.e. earphone is connect with mobile phone；In S22, earphone Whether the MIC bias voltage for judging that mobile phone provides is higher than 2.7V, if so, going to S23, otherwise goes to S24；In S23, earphone Determine that the MIC bias voltage that mobile phone provides is higher than 2.7V, for example, 5V, it is determined that the mobile phone supports active noise reduction, to the mobile phone It sends previously arranged signal (corresponding to the previously arranged signal in S14 in Fig. 3), and enters noise reduction operating mode, i.e. acquisition noise signal, frequency Divide multiplex noise signal, Xiang Shouji transmitted noise signal, and receive the mixed signal that mobile phone is sent, and plays mixing letter Number；In S24, the MIC bias voltage that earphone determines that mobile phone provides is not above 2.7V, it is determined that the mobile phone is not supported actively to drop It makes an uproar, into normal mode of operation, i.e., is worked with the identity of common headphones.
It should be understood that 2.7V and 5V involved in Fig. 7 and Fig. 8 is merely illustrative and non-limiting.
After mobile phone detects the four-part form audio interface of earphone cable four-part form pin insertion mobile phone, mobile phone encoding and decoding (codec) chip can briefly be lifted ear microphone biasing (HSMICBIAS) voltage (such as being lifted to 5V from 2.7V), and Recording channel is opened, detects whether that the first previously arranged signal can be received, if after HSMICBIAS voltage lifting a period of time, Mobile phone codec chip does not detect the first previously arranged signal, then it is assumed that is be currently inserted into is common headphones, then by HSMICBIAS Voltage drops back to 2.7V, subsequent the earphone to be handled as common headphones.
If after HSMICBIAS voltage is lifted by mobile phone codec chip, the interlock circuit in the DSP module in earphone is visited Measure the raising of HSMICBIAS voltage, it is determined that the mobile phone supports active noise reduction, which can be also switched to by normal mode of operation Noise reduction operating mode, i.e. DSP module 130 are powered to noise reduction MIC, and are carried out frequency division to the noise signal of noise reduction MIC acquisition and answered With processing.At the same time, earphone can send the first previously arranged signal to mobile phone, indicate earphone as active earphone, prompting mobile telephone set using this Noise reduction operating mode can also be opened, specifically, which is, for example, a special audio signal, for example, 1k, The clean audio signal that this nature of 8k or 16k does not have very much.
It should be understood that earphone, which can be continued for a period of time to mobile phone, sends first previously arranged signal, such as persistently send 0.5s.
After mobile phone receives first previously arranged signal, it is determined that the earphone is ANC earphone, then mobile phone also works in noise reduction work Operation mode carries out noise reduction process to the frequency-division multiplex singal (analog signal) that earphone is sent.
It should also be understood that the four-part form audio of i.e. earphone cable four-part form pin insertion mobile phone connects after earphone is connect with mobile phone After mouthful, the HSMICBIAS voltage that mobile phone provides is constantly in 2.7V, and there is no being lifted, then the earphone, which only works, is commonly working Mode works as a common headphones, i.e., the earphone does not have decrease of noise functions.
It should be understood that in embodiments of the present invention, ANC earphone can and connect first before opening active noise reduction operating mode The terminal connect carries out handshake procedure, that is, is mutually authenticated whether other side supports active noise reduction function, and supports actively in both sides On the basis of noise reduction, the step of executing active noise reduction, active noise reduction is realized, so that providing after noise reduction process for user has term Sound signal.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band.
Specifically, in the handshake procedure between above-mentioned earphone and terminal, the audio mixing frequency for the first previously arranged signal being related to With the sending time and duration of audio mixing mode and first previously arranged signal, corresponding position can be done according to the actual situation Reason, such as: by way of frequency division multiplexing, other signals are attached to using the signal of supersonic band, so that the algorithm of mobile phone terminal Thin interbed can be carried out, therefore to determine that this earphone is ANC earphone.
It should be understood that generating first previously arranged signal in addition to signal using supersonic band is attached to other signals, may be used also To generate first previously arranged signal using other high-frequency signals come other subsidiary signals, the embodiment of the present invention is not construed as limiting this.
It should be understood that transmission circuit 130 sends the frequency-division multiplex singal to terminal by the microphone pin of the earphone, so as to It is demodulated to obtain at least two-way noise signal according to the frequency-division multiplex singal in the terminal.
Optionally, in embodiments of the present invention, which is also used to, and sends to the terminal for asking whether Support the second previously arranged signal of active noise reduction；
The transmission circuit 130 is also used to, and receives the third previously arranged signal that the terminal is sent according to second previously arranged signal, should Third previously arranged signal is used to indicate the terminal and supports active noise reduction；
The noise reduction control circuit 170 is specifically used for, and according to the received third previously arranged signal of the transmission circuit, determines the end Support active noise reduction in end.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band, second agreement Signal is the unrecognized audio signal of human ear.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.Third previously arranged signal is the unrecognized audio signal of human ear, the third prearranged signals For example, ultrasonic audio signal.It should be understood that second reservation signal and third reservation signal are all public for earphone and terminal Know.
It should be understood that the handshake procedure described above is earphone and terminal before opening noise reduction operating mode.It can also adopt Realize that the handshake procedure, the embodiment of the present invention are not construed as limiting this with other means.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
Optionally, in embodiments of the present invention, which is numeric type microphone, which also wraps It includes:
D/A converting circuit 190, the frequency-division multiplex singal processing for obtaining the signal processing circuit are simulation letter Number；
Wherein, which is specifically used for, and sends the analog signal to the terminal by the microphone pin.
It should be understood that noise reduction microphone 110 or analogue type MIC in the embodiment of the present invention, but in its acquisition Before noise signal (analog signal) carries out frequency division multiplexing processing, after needing that the noise signal is first converted to digital signal, then Carry out subsequent processing.
Optionally, the noise reduction microphone 110 in the embodiment of the present invention is analogue type MIC.
Specifically, i.e., this at least two-way noise signal be analog signal.
Wherein, which is specifically used for, and to this, at least two-way noise signal carries out modulus processing first, Obtain at least corresponding digital signal of two-way noise signal；Then corresponding at least two-way noise signal in numeric field Digital signal carries out frequency division multiplexing processing, then carries out digital-to-analogue conversion to obtained frequency-division multiplex singal, obtains corresponding simulation letter Number, the analog signal is sent to terminal.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In embodiments of the present invention, in addition to believing including at least two-way noise in the frequency-division multiplex singal that earphone is sent to terminal Extra can also include but is not limited to other sensors signal, such as earphone in the measuring signal of level sensor.It should be understood that Sensor measurement signal can be sent to terminal by a channel by frequency-division multiplex singal, and terminal crosses frequency division multiplexing letter to this Number demodulation after the available sensor measurement signal, so as to obtain the more information about earphone local environment.
Optionally, as shown in figure 9, in embodiments of the present invention, the earphone 100 further include:
Sensor 180, for acquiring sensor measurement signal；
The signal processing circuit 120 is specifically used for, and by this, at least two-way noise signal and the sensor measurement signal are modulated Onto different frequency spectrums, the frequency-division multiplex singal is obtained.
Specifically, such as the sensor 180 is earphone in level sensor, which can indicate that earphone is It is no to be worn on ear, such as the distance between earpiece and ear can be measured.Alternatively, which, which can also be, adds Speed meter, gyroscope or the other sensors for measuring human body sport parameter.
The signal processing circuit 120 is specifically used for, and by this, at least two-way noise signal and the sensor measurement signal are modulated Onto different frequency spectrums, for example, the sensor measurement signal data distribution frequency spectrum are as follows: 78kHz~88kHz, in Fig. 3 The frequency spectrum distributed for signal 7.
It should be understood that in terminal side, demodulates to obtain the demodulation according to the frequency-division multiplex singal and obtain sensor measurement signal, when When determining distance of the earpiece of earphone apart from ear beyond threshold value, that is, when determining that earphone leaves ear, then stop to send to earphone Audio signal (assuming that before this, terminal sends audio signal to earphone always)；Conversely, terminal keeps sending audio to earphone Signal.
It should be understood that in embodiments of the present invention, which can also be the signal of other sensors acquisition, Such as infrared sensor etc..
Therefore, in embodiments of the present invention, by sending sensor measurement signal to terminal, terminal can be allowed to know more About the information of earphone local environment, so as to adjust the communication between terminal and earphone neatly, in real time.
In embodiments of the present invention, in earpiece side acquisition noise signal, noise signal is sent to terminal side；In terminal side Noise reduction process is carried out, generates for the de-noising signal to noise signal noise reduction, de-noising signal is sent to earphone, by raising for earphone Sound device plays out, to realize noise reduction.Therefore, in embodiments of the present invention, no setting is required in earphone Dolby circuit, can Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Optionally, in embodiments of the present invention, signal processing circuit 120, power circuit 150, noise reduction control circuit 170, D/A converting circuit 190, call/recording microphone 160 and for for noise reduction microphone 110 provide reference clock signal when Clock circuit, can be independent from each other circuit, also be desirably integrated into a functional module, and comparison of the embodiment of the present invention does not limit It is fixed.
Figure 10 shows the schematic diagram of the earphone 300 provided according to embodiments of the present invention, which includes:
Noise reduction microphone 310, for acquiring at least two-way noise signal, which is numeric type microphone；
Integrated treatment circuit 320, comprising:
Call/recording microphone 321, for acquiring voice signal；
Power circuit 322, for obtaining the voltage that the terminal provides from the microphone pin, and according to the voltage to the drop Microphone 310 and the call/recording microphone 321 of making an uproar provide power supply；
Clock circuit 323, for providing reference clock signal to the noise reduction microphone 310.
Noise reduction control circuit 324 for determining whether the terminal connecting with earphone supports active noise reduction, and is determining the end In the case that active noise reduction is supported at end, the 310 acquisition noise signal of noise reduction microphone is controlled, specifically, it is determined that connecting with earphone Terminal whether support the noise reduction control circuit 170 in the method and foregoing embodiments of noise reduction to determine end for connecting with earphone Whether end supports the method for noise reduction similar, and which is not described herein again.
Signal processing circuit 325, for at least two-way noise signal from the voice signal to be modulated to different frequency spectrums On, obtain frequency-division multiplex singal；
D/A converting circuit 326, the frequency-division multiplex singal for obtaining to the signal processing circuit 325 carry out digital-to-analogue and turn It changes, obtains the analog signal of the frequency-division multiplex singal；
Transmission circuit 330 sends the integrated treatment circuit 320 to terminal for the microphone pin by the earphone and determines Frequency-division multiplex singal (analog signal), which is also used to, and receives the terminal and is sent according to the frequency-division multiplex singal De-noising signal, the de-noising signal be used for this at least two-way noise signal carry out noise reduction；
It should be understood that transmission circuit 330 sends the frequency-division multiplex singal to terminal, in order to which the terminal is according to the frequency division multiplexing Signal demodulates to obtain at least two-way noise signal.
Loudspeaker 340, for playing the de-noising signal of terminal transmission.
Optionally, as shown in Figure 10, which further includes random access memory SRAM327, for storing number According to and information, such as program.
In embodiments of the present invention, in earpiece side acquisition noise signal, noise signal is sent to terminal side；In terminal side Noise reduction process is carried out, generates for the de-noising signal to noise signal noise reduction, de-noising signal is sent to earphone, by raising for earphone Sound device plays out, to realize noise reduction.Therefore, in embodiments of the present invention, no setting is required in earphone Dolby circuit, can Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Figure 11 shows the schematic block diagram of the terminal 400 provided according to embodiments of the present invention, as shown in figure 11, the terminal 400 include:
Transmission circuit 410 receives the frequency-division multiplex singal that earphone is sent for the microphone interface by terminal, wherein The frequency-division multiplex singal is different by the way that at least two-way noise signal of the noise reduction microphone acquisition on the earphone to be modulated to It is got on frequency spectrum, which connect with the microphone pin of the earphone；
Wherein, at least two-way noise signal for example respectively by be mounted on earphone noise reduction MIC acquire two-way noise signal.
Signal processing circuit 420 obtains at least two-way noise signal for demodulating the frequency-division multiplex singal；
Dolby circuit 430, for according to the signal processing circuit determine this at least two-way noise signal generate noise reduction letter Number, the de-noising signal is for this, at least two-way noise signal to carry out noise reduction；
Specifically, the de-noising signal is identical as the amplitude of the noise signal, opposite in phase, so as to offset noise letter Number.The generating process of the de-noising signal can be found in prior art the present embodiment and not repeat.
The transmission circuit 410 is also used to, and sends the de-noising signal to the earphone.
In embodiments of the present invention, terminal demodulates noise signal from the frequency-division multiplex singal that earphone is sent, generate with Then the de-noising signal of the noise signal opposite in phase sends the de-noising signal to earphone.Therefore, in embodiments of the present invention, Noise signal is handled in terminal side, and generates de-noising signal, so that the module of no setting is required inside earphone noise reduction process, Neng Gou Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Specifically, such as terminal is mobile phone, which is located in the codec chip of mobile phone.
It should be understood that in embodiments of the present invention, at least two-way noise signal is specially two-way noise signal or four road noises for this Acoustical signal or greater number of noise signal, the embodiment of the present invention be not construed as limiting this, according to the noise reduction MIC of earpiece side installation Depending on quantity.
It should also be understood that earphone is connected by the four-part form pin of earphone cable and the four-part form audio interface of terminal, work is carried out Make.
Specifically, transmission circuit 410 is received by the four-part form audio interface of terminal and the four-part form pin of earphone cable The frequency-division multiplex singal that earphone is sent.
Specifically, signal processing circuit 420 is used for, and generates the machine of frequency-division multiplex singal based on noise signal based on earpiece side System, demodulates the frequency-division multiplex singal and obtains at least two-way noise signal.It specifically, is according to default frequency such as in earpiece side Spectrum distribution information, by will at least two-way noise signal be modulated on different spectral to obtain the frequency-division multiplex singal, then at end End side can distribute information based on the default frequency spectrum, demodulate the frequency-division multiplex singal to obtain at least two-way noise signal.
For example, at least two-way noise signal to be modulated to the process of frequency-division multiplex singal in earpiece side are as follows: will at least two-way First via noise signal A in noise signal is modulated to the first son frequency of Reusespectrum by the frequency spectrum a where noise signal A script It takes, the second road noise acoustical signal B is modulated on the second sub-band of Reusespectrum by the frequency spectrum b where noise signal B script. In the present embodiment, specifically, which includes the corresponding relationship of frequency spectrum a and the first sub-band, and The corresponding relationship of frequency spectrum b and the second sub-band.Accordingly, in terminal side, frequency spectrum distribution information is preset according to this, frequency division is answered It is demodulated with signal, specifically, the signal on the first sub-band in the frequency-division multiplex singal is demodulated, i.e., by first Signal on sub-band is restored on frequency spectrum a, to obtain first via noise signal A；To the signal on the second sub-band into Signal on second sub-band, i.e., be restored on frequency spectrum b, to obtain the second road noise acoustical signal B by row demodulation.
It should also be understood that in embodiments of the present invention, at least two-way noise signal that noise reduction microphone acquires is modulated to It on different frequency spectrums, refers specifically to, by this, at least two-way noise signal is modulated to the corresponding channel of microphone pin of earphone Spectral range different frequency spectrums on.
Specifically, earpiece side handles the frequency division multiplexing of at least two-way noise signal the description of combination Fig. 2 as detailed above, this In repeat no more.
Optionally, in embodiments of the present invention, the protection bandwidth of the frequency-division multiplex singal is not less than preset value.
Specifically, which can be arranged according to specific requirements, such as the protection bandwidth of the frequency-division multiplex singal is 4kHz, the embodiment of the present invention are not construed as limiting this.
Dolby circuit 430, for according to the signal processing circuit determine this at least two-way noise signal generate noise reduction letter Number, the de-noising signal is for this, at least two-way noise signal to carry out noise reduction, specifically, the vibration of the de-noising signal and noise signal Identical, opposite in phase.
Specifically, for example, when at least two-way noise signal that get from earpiece side includes making an uproar near left earpiece all the way Acoustical signal C, and the noise signal D near right earpiece all the way, at this moment, the de-noising signal c, Cong Zuosheng generated according to noise signal C Road is sent, and according to the de-noising signal d that noise signal D is generated, is sent from right channel.
The transmission circuit 410 is specifically used for, by the left channel interface of earphone connecting line and right channel interface to the earphone Send the de-noising signal.
In embodiments of the present invention, terminal demodulates noise signal from the frequency-division multiplex singal that earphone is sent, generate with Then the de-noising signal of the noise signal opposite in phase sends the de-noising signal to earphone.Therefore, in embodiments of the present invention, Noise signal is handled in terminal side, and generates de-noising signal, so that the module of no setting is required inside earphone noise reduction process, Neng Gou Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Optionally, in embodiments of the present invention, which is specifically used for, and is sending noise reduction letter to the terminal Number when, also send useful audio signal to the terminal.It should be understood that the useful audio signal is the audio letter that user needs to listen to Number, for example, the useful audio signal is the audio signals such as music or speech signal.To which, headset earpiece is by the de-noising signal It is played out with useful audio signal, user can hear more pure music or speech signal.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal and Reference clock signal is modulated to be got on different frequency spectrums, and the reference clock signal for being aligned this, at least believe by two-way noise Number；
The signal processing circuit 420 is also used to, and obtains the reference clock signal, and root by demodulating the frequency-division multiplex singal At least two-way noise signal is aligned according to the reference clock signal.
In embodiments of the present invention, which can be handset earphone, that is, include call/recording MIC (also referred to as chest Wheat).It when user uses the call/recording MIC, such as records or converses with other users, believe at least two-way noise Number carry out frequency division multiplexing processing when, also include to call/recorded audio signals frequency division multiplexing.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal with should Call on earphone/recording microphone acquisition voice signal is modulated to be got on different frequency spectrums；
Signal processing circuit 420 is also used to, and obtains the voice signal by demodulating the frequency-division multiplex singal；
The terminal 400 further include:
Speed signal processing circuit 440, for handling the voice signal.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In embodiments of the present invention, terminal has noise reduction operating mode and normal mode of operation, and terminal is to determine opposite end In the case that earphone supports active noise reduction, noise reduction operating mode is opened, is otherwise in normal mode of operation.Wherein, in unskilled labor Under operation mode, terminal default only receives call/recording MIC (i.e. chest wheat) collected call/recorded audio signals from earphone, only gives ear Machine provides common MIC bias voltage.Under noise reduction operating mode, terminal can promote the MIC bias voltage of earphone, such as commonly MIC bias voltage is 2.7V, at this moment improves the MIC bias voltage of 5V.Simultaneously, it is believed that is received from earpiece side is according to default Frequency spectrum distributes the frequency-division multiplex singal of modulates information, and then presets frequency spectrum distribution information according to this, solves from frequency-division multiplex singal Tune obtains noise signal (perhaps also demodulation obtains call/recorded audio signals or sensor measurement signal), generates and believes with the noise Number opposite in phase is de-noising signal, and is sent to earpiece side.
In embodiments of the present invention, earphone also includes two kinds of operating modes, and one is normal mode of operation, and one is noise reductions Operating mode.Wherein, in a normal mode of operation, earphone does not have a decrease of noise functions, i.e., receives audio signal from terminal merely, from listening Cylinder plays out, and will not provide the terminal with noise signal, specifically, the noise reduction MIC in earphone will not work.In noise reduction Working mould Under formula, earphone is powered to noise reduction MIC, noise reduction MIC work, acquisition noise signal, and carries out frequency division multiplexing processing to noise signal, By treated, multiplexed signals is sent to terminal.
I.e. the terminal and the earphone are all that in the case that confirmation opposite end has active noise reduction function, can just open noise reduction work Operation mode.
Optionally, in embodiments of the present invention, the terminal also 400 includes:
Control circuit 450, for being connect by the microphone of the terminal in the case where determining that the earphone supports active noise reduction Mouth continues to provide the voltage more than preset voltage value to the earphone.
Optionally, in embodiments of the present invention, which is specifically used for, when the terminal is connect with earphone, Voltage in preset time period by the microphone interface of the terminal to earphone offer more than preset voltage value；
The transmission circuit 410 is also used to, and receives first for being used to indicate the earphone and supporting active noise reduction of earphone transmission Previously arranged signal；
The control circuit 450 is used for, and according to first previously arranged signal, determines that the earphone supports active noise reduction.
Specifically, after earphone is connect with terminal, terminal is lifted the MIC bias voltage to earphone, for example, common headphones Default MIC bias voltage value is 2.7v (corresponding to the preset voltage value in the embodiment of the present invention), the end in the embodiment of the present invention It is 5V that end, which is the MIC bias voltage that earphone provides,.When headset detection to be more than preset voltage value MIC voltage value when, determine pair End terminal can support active noise reduction.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.It should be understood that first reservation signal is all well known for earphone and terminal.
Technical solution provided in an embodiment of the present invention is described taking the terminal as an example below.Mobile phone detects earphone cable four After segmentation pin is inserted into the four-part form audio interface of mobile phone, mobile phone encoding and decoding (codec) chip can briefly be lifted earphone Mike (HSMICBIAS) voltage (such as being lifted to 5V from 2.7V) is set in windage yaw, and opens recording channel, detects whether to receive First previously arranged signal, if mobile phone codec chip does not detect the first agreement after HSMICBIAS voltage lifting a period of time Signal, then it is assumed that is be currently inserted into is common headphones, then HSMICBIAS voltage is dropped back to 2.7V, it is subsequent will the earphone as Common headphones processing.
If after HSMICBIAS voltage is lifted by mobile phone codec chip, the interlock circuit in the DSP module in earphone is visited Measure the raising of HSMICBIAS voltage, it is determined that the mobile phone supports active noise reduction, which can be also switched to actively by general mode Noise reduction mode, i.e. DSP module 130 are powered to noise reduction MIC, and are carried out at frequency division multiplexing to the noise signal of noise reduction MIC acquisition Reason.At the same time, earphone can send the first previously arranged signal to mobile phone, indicate earphone as active earphone using this, prompting mobile telephone set can also Open active noise reduction mode, specifically, which is, for example, a special audio signal, for example, 1k, 8k or The clean audio signal that this nature of 16k does not have very much.
It should be understood that earphone, which can be continued for a period of time to mobile phone, sends first previously arranged signal, such as persistently send 0.5s.
After mobile phone receives first previously arranged signal, it is determined that the earphone is ANC earphone, then mobile phone also works drops in active It makes an uproar mode, i.e., noise reduction process is carried out to the reasonable signal (analog signal) that earphone is sent.
It should also be understood that the four-part form audio of i.e. earphone cable four-part form pin insertion mobile phone connects after earphone is connect with mobile phone After mouthful, the HSMICBIAS voltage that mobile phone provides is constantly in 2.7V, and there is no being lifted, then the earphone only works in general mode, It works as a common headphones, i.e., the earphone does not have decrease of noise functions.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band.
Optionally, in embodiments of the present invention, which is specifically used for, and is receiving the frequency-division multiplex singal Before, the second previously arranged signal for being used to ask whether to support active noise reduction of earphone transmission is received；
The control circuit 450 is used for, and according to second previously arranged signal, determines that the earphone supports active noise reduction；
The transmission circuit 410 is also used to, and is sent to the earphone and is used to indicate the third agreement that the terminal supports active noise reduction Signal.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band, second agreement Signal is the unrecognized audio signal of human ear.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.It should be understood that second reservation signal and third reservation signal for earphone and terminal all It is well known.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In embodiments of the present invention, in addition to believing including at least two-way noise in the frequency-division multiplex singal that earphone is sent to terminal Extra can also include but is not limited to other sensors signal, such as earphone in the measuring signal of level sensor.It should be understood that Sensor measurement signal can be sent to terminal by a channel by frequency-division multiplex singal, and terminal crosses frequency division multiplexing letter to this Number demodulation after the available sensor measurement signal, so as to obtain the more information about earphone local environment.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal with should The sensor measurement signal of sensor acquisition on earphone, which is modulated to, to be got on different frequency spectrums；
Signal processing circuit 420 is also used to, and by demodulating the frequency-division multiplex singal, obtains the sensor measurement signal；
The terminal 400 further include:
Sensor signal processing circuit 460, for handling the sensor measurement signal.
Specifically, which is, for example, the signal of earphone sensor measurement in place.
Optionally, in embodiments of the present invention, the sensor measurement signal be used to indicate the earphone earpiece and human ear it Between range information；
The S250 is correspondingly handled according to the sensor measurement signal, comprising:
S251, when determining that the distance between earpiece and human ear of the earphone are more than threshold value according to the sensor measurement signal When, stop to play the mixed signal to the earphone.
Specifically, such as on earphone one earphone is installed in level sensor, by this earphone sensor measurement in place biography Sensor measuring signal, the sensor measurement signal can indicate whether earphone is worn on ear, such as can measure earpiece and ear The distance between piece.
To this, at least two-way noise signal, the sensor measurement signal and reference clock signal carry out frequency division multiplexing processing Process it is as indicated above, which is not described herein again.
It should be understood that in embodiments of the present invention, which can also be the signal of other sensors acquisition, Such as accelerometer, gyroscope or other sensors for measuring human body sport parameter etc..
It should be understood that in terminal side, demodulates to obtain the demodulation according to the frequency-division multiplex singal and obtain sensor measurement signal, when When determining distance of the earpiece of earphone apart from ear beyond threshold value, that is, when determining that earphone leaves ear, then stop to send to earphone Audio signal (assuming that before this, terminal sends audio signal to earphone always)；Conversely, terminal keeps sending audio to earphone Signal.
Therefore, in embodiments of the present invention, by sending sensor measurement signal to terminal, terminal can be allowed to know more About the information of earphone local environment, so as to adjust the communication between terminal and earphone neatly, in real time.
Optionally, in embodiments of the present invention, the received frequency-division multiplex singal of the transmission circuit is analog signal；
The signal processing circuit 420 is specifically used for, before demodulating the frequency-division multiplex singal, to the frequency-division multiplex singal into Row analog-to-digital conversion process obtains corresponding digital signal.
In embodiments of the present invention, terminal demodulates noise signal from the frequency-division multiplex singal that earphone is sent, generate with Then the de-noising signal of the noise signal opposite in phase sends the de-noising signal to earphone.Therefore, in embodiments of the present invention, Noise signal is handled in terminal side, and generates de-noising signal, so that the module of no setting is required inside earphone noise reduction process, Neng Gou Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Figure 12 shows the schematic flow chart of the method 500 of the noise reduction provided according to embodiments of the present invention, such as This method 500 can be executed by the earphone 100 in above-described embodiment, and as shown in figure 12, this method 500 includes:
S510 passes through the noise reduction microphone acquisition at least two-way noise signal on earphone；
Specifically, such as shown in Figure 1 noise reduction microphone 110 acquires at least two-way noise signal.
S520, by this, at least two-way noise signal is modulated on different frequency spectrums, obtains frequency-division multiplex singal；
S530 sends the frequency-division multiplex singal to terminal by the microphone pin of the earphone；
It should be understood that the terminal can demodulate to obtain at least two-way noise signal according to the frequency-division multiplex singal.
S540 receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, which is used for this extremely Few two-way noise signal carries out noise reduction；
S550 plays the de-noising signal of terminal transmission.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In S510, specifically, at least two-way noise signal may be four road noise acoustical signals, six road noise sound for this of acquisition Signal or more road noise acoustical signals, the embodiment of the present invention are not construed as limiting this.Specifically, for example, this at least two-way noise believe Number be four road noise acoustical signals, accordingly, on earphone be mounted with 4 noise reduction MIC, two of them are respectively distributed to the outside of left earpiece And inside (space i.e. between earpiece and ear), other two is respectively distributed to the outside and inside of right earpiece, thus by this Four noise reduction MIC acquire 4 road noise acoustical signals.It should be understood that acquiring ring using four noise reduction MIC or greater number of noise reduction MIC Border noise signal can more comprehensively obtain the periotic ambient noise of people, so that subsequent can be better achieved noise reduction.
It should also be understood that in embodiments of the present invention, only noise signal all the way can also be obtained using a noise reduction MIC.Example Such as, it is mounted with that a noise reduction MIC, such as noise reduction MIC are located at apart from left earpiece and right earpiece apart from identical position on earphone. By this, noise signal is sent to terminal to earphone all the way, and terminal generates noise reduction letter identical as the noise amplitude signal, opposite in phase Number, earphone receives the de-noising signal that terminal is sent, and is equivalent to left and right earpiece and receives same de-noising signal, it should be appreciated that It is that by decrease of noise functions.
It should also be understood that in embodiments of the present invention, earphone can be In-Ear earphone, it is also possible to headphone. Corresponding, the earpiece of earphone is also referred to as earplug or earmuff.The earpiece of In-Ear earphone is earplug, and headphone is listened Cylinder can be referred to as earmuff.
S520, by this, at least two-way noise signal is modulated on different frequency spectrums, obtains frequency-division multiplex singal.Specifically, Information is distributed according to default frequency spectrum, at least two-way noise signal is modulated on different frequency spectrums by this, obtains frequency division multiplexing letter Number, which includes the corresponding relationship for needing the signal and Reusespectrum that are multiplexed.For example, will at least two-way make an uproar Acoustical signal is modulated to the process of frequency-division multiplex singal are as follows: by the first via noise signal A at least two-way noise signal by noise Frequency spectrum a where signal A script is modulated on the first sub-band of Reusespectrum, by the second road noise acoustical signal B by noise signal B Originally the frequency spectrum b where is modulated on the second sub-band of Reusespectrum.In the present embodiment, specifically, the default frequency spectrum point It include the corresponding relationship of frequency spectrum a and the first sub-band and the corresponding relationship of frequency spectrum b and the second sub-band with information.It is corresponding Ground is preset frequency spectrum distribution information according to this and is demodulated to the frequency-division multiplex singal in terminal side, specifically, multiple to the frequency division It is demodulated, i.e., the signal on the first sub-band is restored on frequency spectrum a with the signal on the first sub-band in signal, thus Obtain first via noise signal A；Signal on second sub-band is demodulated, i.e., it is the signal on second sub-band is extensive It answers onto frequency spectrum b, to obtain the second road noise acoustical signal B.
It should also be understood that in embodiments of the present invention, at least two-way noise signal that noise reduction microphone acquires is modulated to It on different frequency spectrums, refers specifically to, by this, at least two-way noise signal is modulated to the corresponding channel of microphone pin of earphone Spectral range different frequency spectrums on.
Specifically, such as the noise reduction microphone 110 is four noise reduction microphones, arrangement such as Fig. 2 institute on earphone Show, i.e., this at least two-way noise signal is four road noise acoustical signals, respectively by being located at left horn inside, outside, on the inside of right horn, outside The noise reduction MIC acquisition noise signal of side, it is assumed that the data of every road noise acoustical signal are only limitted to 2.5kHz band in the four road noises acoustical signal Data within width, then the concrete condition for four road noises acoustical signal progress frequency spectrum distribution is as shown in Figure 3:
The de-noising signal (signal 2 as shown in Figure 3) acquired of noise reduction MIC on the outside of left horn is assigned to: 28kHz~ 34kHz；
The de-noising signal (signal 3 as shown in Figure 3) of noise reduction MIC acquisition on the inside of left horn is assigned to: 38kHz~ 44kHz；
The de-noising signal (signal 4 as shown in Figure 3) acquired of noise reduction MIC on the outside of right horn is assigned to: 48kHz~ 54kHz；
The de-noising signal (signal 5 as shown in Figure 3) of noise reduction MIC acquisition on the inside of right horn is assigned to: 58kHz~ 64kHz。
Optionally, in embodiments of the present invention, the protection bandwidth of the frequency-division multiplex singal is not less than preset value.
Specifically, which can be arranged according to specific requirements, such as the protection bandwidth of the frequency-division multiplex singal is 4kHz, the embodiment of the present invention are not construed as limiting this.
It should be understood that the protection bandwidth of frequency-division multiplex singal refers to the frequency in the multiplexed signals between adjacent two paths of signals Spectrum interval, the protection bandwidth can guarantee that the signal of the transmission on different frequency range is not interfere with each other.Specifically, as shown in figure 3, for example Protection bandwidth per the data of signal all the way is set not less than 4kHz.
Optionally, in embodiments of the present invention, by this, at least two-way noise signal is modulated on different frequency spectrums S520, is obtained Take frequency-division multiplex singal, comprising:
S521, by this, at least two-way noise signal and reference clock signal are modulated on different frequency spectrums, obtain the frequency Division multiplex signal, the reference clock signal is for being aligned at least two-way noise signal.
For example, this at least two-way noise signal includes that two noise reduction microphones being arranged near the left earpiece of earphone acquire Two-way noise signal, the two-way noise signal is after spectrum modulation, it is possible to because modulation algorithm error etc. brings phase inclined Difference, i.e., in frequency-division multiplex singal, there are phase deviations for this two-way noise signal.Terminal receives the frequency-division multiplex singal, And this two-way noise signal obtained after the demodulation is also there are phase deviation, will lead to cannot generate accurate noise reduction letter Number.In order to avoid this problem, when earpiece side carries out frequency division multiplexing processing to multipath noise signal, that is, reference clock letter is provided Number so that terminal when demodulating frequency-division multiplex singal according to the reference clock signal, can be to there are the noise of phase deviation letters It number is modified, to obtain accurate de-noising signal.
Specifically, as shown in figure 3, in earpiece side frequency division multiplexing, by reference clock signal (signal as shown in Figure 3 6) it is assigned on the frequency spectrum of 70kHz, accordingly, terminal demodulates the reference clock signal from the frequency spectrum of 70kHz, according to the ginseng It examines clock signal and is aligned to the multipath noise signal come is demodulated, and then generate accurately noise signal.
As shown in figure 3, specifically, reference clock signal (signal 6 as shown in Figure 3) is assigned to: 70kHz.
It should be understood that in embodiments of the present invention, which may be handset earphone, that is, include call/recording MIC ( It can be referred to as chest wheat).It when user uses the call/recording MIC, such as records or converses with other users, at least It also include to call/recorded audio signals frequency division multiplexing when two-way noise signal carries out frequency division multiplexing processing.
Optionally, in embodiments of the present invention, which is numeric type microphone, and S530 passes through the wheat of the earphone Gram wind pin sends the frequency-division multiplex singal to terminal, comprising:
The frequency-division multiplex singal is carried out digital-to-analogue conversion, obtains the corresponding analog signal of the frequency-division multiplex singal by S531；
S532 sends the frequency-division multiplex singal after the digital-to-analogue conversion to the terminal by the microphone pin.
It should be understood that the noise reduction microphone may be simulation microphone, then in S520, will at least believe two-way noise first Number analog-to-digital conversion is digital signal, then by multi-path digital signal modulation to different spectral, generates frequency-division multiplex singal, into The subsequent processing of row.
Optionally, in embodiments of the present invention, S540 receives the terminal and is believed according to the noise reduction that the frequency-division multiplex singal is sent Number, comprising:
The de-noising signal that the terminal is sent according to the frequency-division multiplex singal is received, and receives the useful audio of terminal transmission Signal；
S550 plays the de-noising signal of terminal transmission, comprising:
The de-noising signal is played, and plays the useful audio signal.
Specifically, which is, for example, the audio signals such as music or speech signal.So that headset earpiece will The de-noising signal is played out with useful audio signal, and user can hear more pure music or call.
In embodiments of the present invention, earpiece side is responsible for acquisition noise signal, is sent to terminal side and carries out noise reduction process, because This, earpiece side is not necessarily to solve the powerup issue of Dolby circuit naturally without arranging Dolby circuit；Secondly, in the embodiment of the present invention Using four-section type headset pin, terminal can use to the power supply of the microphone pin in four-part form pin to drive noise reduction Microphone and signal processing circuit for frequency division multiplexing processing, to eliminated inside earphone with larger volume and weight Power module simplifies the design of earphone, has simplified the volume of earphone, can reduce earphone manufacturing cost and maintenance at This, also can be improved the portability of earphone.
Optionally, in embodiments of the present invention, this method 500 further include:
S560 acquires voice signal by the call on the earphone/recording microphone；
By this, at least two-way noise signal is modulated on different frequency spectrums S520, obtains frequency-division multiplex singal, comprising:
At least two-way noise signal and the voice signal is modulated on different frequency spectrums, obtains the frequency division by S522 Multiplexed signals.
Specifically, by voice signal together at least two-way noise signal frequency division multiplexing, be determined as multiplexed signals all the way, it is false If the bandwidth of operation of the data of call/recording MIC output voice signal is 20kHz, for the voice for MIC output of conversing or record The frequency spectrum of the data distribution of signal are as follows: 0~24kHz, the frequency spectrum as in Fig. 3 being the distribution of signal 1.Frequency spectrum is distributed such as noise signal Described above, which is not described herein again.
It should be understood that in embodiments of the present invention, earphone passes through frequency-division multiplex singal for call/recorded audio signals and multipath noise Signal is sent to terminal together, accordingly, in terminal side by demodulating to frequency-division multiplex singal, it is logical can to recover this Words/recorded audio signals and multipath noise signal carry out noise reduction process for noise signal, call/recorded audio signals are sent to phase The audio-frequency signal processing module of pass, such as codec chip are handled.Therefore, in embodiments of the present invention, active noise reduction is realized While, it will not influence the business of user's normal use call/recording microphone point, two kinds of events can carry out simultaneously, mutually not Interference, so as to improve satisfaction of users.
It should also be understood that in embodiments of the present invention, earphone includes two kinds of operating modes, one is normal mode of operation, one Kind is noise reduction operating mode.Wherein, in a normal mode of operation, earphone does not have decrease of noise functions, i.e., receives audio from terminal merely Signal is played out from earpiece, will not provide the terminal with noise signal, and specifically, the noise reduction MIC in earphone will not work.? Under noise reduction operating mode, earphone is powered to noise reduction MIC, noise reduction MIC work, acquisition noise signal, and carries out frequency to noise signal Divide multiplexing process, multiplexed signals is sent to terminal by treated.
Earphone is in the case where determining that terminal supports active noise reduction, Cai Huikai noise reduction operating mode, is otherwise in unskilled labor Operation mode.
Optionally, in embodiments of the present invention, S510 is believed by the noise reduction microphone acquisition at least two-way noise on earphone Number, comprising:
S511, determines whether the terminal supports active noise reduction；
S512 should by the noise reduction microphone acquisition on the earphone in the case where determining that the terminal supports active noise reduction At least two-way noise signal.
Specifically, the signal made an appointment between earphone and terminal by transmission, to inform whether other side oneself supports to lead Dynamic noise reduction.
Optionally, in embodiments of the present invention, S511 determines whether the terminal supports active noise reduction, comprising:
S511A determines the end when the voltage that the terminal obtained from the microphone pin provides is more than preset voltage value Support active noise reduction in end；
This method 100 further include:
S570 sends to the terminal by the microphone pin and is used to indicate the earphone also supports active noise reduction first Previously arranged signal.
Specifically, as shown in Figure 4 and Figure 5, description as detailed above, which is not described herein again.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band.
Specifically, in the handshake procedure between above-mentioned earphone and terminal, the audio mixing frequency for the first previously arranged signal being related to With the sending time and duration of audio mixing mode and first previously arranged signal, corresponding position can be done according to the actual situation Reason, such as: by way of frequency division multiplexing, other signals are attached to using the signal of supersonic band, so that the algorithm of mobile phone terminal Thin interbed can be carried out, therefore to determine that this earphone is ANC earphone.
It should be understood that generating first previously arranged signal in addition to signal using supersonic band is attached to other signals, may be used also To generate first previously arranged signal using other high-frequency signals come other subsidiary signals, the embodiment of the present invention is not construed as limiting this.
Optionally, in embodiments of the present invention, S511 determines whether the terminal supports active noise reduction, comprising:
S511B sends the second previously arranged signal for asking whether support active noise reduction to the terminal；
S511C receives the third previously arranged signal that the terminal is sent according to second previously arranged signal, which uses In instruction, the terminal supports active noise reduction；
S511D determines that the terminal supports active noise reduction according to the third previously arranged signal.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band, second agreement Signal is the unrecognized audio signal of human ear.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.Third previously arranged signal is the unrecognized audio signal of human ear, the third prearranged signals For example, ultrasonic audio signal.It should be understood that second reservation signal and third reservation signal are all public for earphone and terminal Know.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In embodiments of the present invention, in addition to believing including at least two-way noise in the frequency-division multiplex singal that earphone is sent to terminal Extra can also include but is not limited to other sensors signal, such as earphone in the measuring signal of level sensor.It should be understood that Sensor measurement signal can be sent to terminal by a channel by frequency-division multiplex singal, and terminal crosses frequency division multiplexing letter to this Number demodulation after the available sensor measurement signal, so as to obtain the more information about earphone local environment.
Optionally, in embodiments of the present invention, this method 500 further include:
S580 acquires sensor measurement signal by the sensor on the earphone；
By this, at least two-way noise signal is modulated on different frequency spectrums S520, obtains frequency-division multiplex singal, comprising:
At least two-way noise signal is modulated on different frequency spectrums from the sensor measurement signal by S523, and obtaining should Frequency-division multiplex singal.
It specifically, is the frequency spectrum that the data of sensor measurement signal are distributed are as follows: 78kHz during S520 frequency division multiplexing ~88kHz, the frequency spectrum as in Fig. 3 being the distribution of signal 7.
Specifically, such as on earphone one earphone is installed in level sensor, by this earphone sensor measurement in place biography Sensor measuring signal, the sensor measurement signal can indicate whether earphone is worn on ear, such as can measure earpiece and ear The distance between piece.
To this, at least two-way noise signal, the sensor measurement signal and reference clock signal carry out frequency division multiplexing processing Process it is as indicated above, which is not described herein again.
It should be understood that in terminal side, demodulates to obtain the demodulation according to the frequency-division multiplex singal and obtain sensor measurement signal, when When determining distance of the earpiece of earphone apart from ear beyond threshold value, that is, when determining that earphone leaves ear, then stop to send to earphone Audio signal (assuming that before this, terminal sends audio signal to earphone always)；Conversely, terminal keeps sending audio to earphone Signal.
It should be understood that in embodiments of the present invention, which can also be the signal of other sensors acquisition, Such as accelerometer, gyroscope or other sensors for measuring human body sport parameter etc..
Therefore, in embodiments of the present invention, by sending sensor measurement signal to terminal, terminal can be allowed to know more About the information of earphone local environment, so as to adjust the communication between terminal and earphone neatly, in real time.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
It should be understood that the method 500 of the noise reduction provided according to embodiments of the present invention can also be provided by above-described embodiment Earphone 300 realize.
Figure 13 shows the schematic flow chart of the method 600 of the noise reduction provided according to embodiments of the present invention, the party Method 600 can for example be executed by the terminal 400 that foregoing embodiments provide, as shown in figure 13, this method comprises:
S610 receives the frequency-division multiplex singal that earphone is sent by the microphone interface of terminal, wherein frequency division multiplexing letter Number for by the way that at least two-way noise signal of the noise reduction microphone acquisition on the earphone to be modulated on different frequency spectrums and gets , which connect with the microphone pin of the earphone；
For example, the noise reduction microphone is two noise reduction microphones, it is separately mounted near the left and right earpiece of earphone, for adopting The noise signal that collection ear can be heard.
S620 demodulates the frequency-division multiplex singal and obtains at least two-way noise signal；
S630, according to this, at least two-way noise signal generates de-noising signal, which is used for at least two road noises Acoustical signal carries out noise reduction；
S640 sends the de-noising signal to the earphone.
In embodiments of the present invention, terminal demodulates noise signal from the frequency-division multiplex singal that earphone is sent, generate with Then the de-noising signal of the noise signal opposite in phase sends the de-noising signal to earphone.Therefore, in embodiments of the present invention, Noise signal is handled in terminal side, and generates de-noising signal, so that the module of no setting is required inside earphone noise reduction process, Neng Gou Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
It should be understood that in embodiments of the present invention, at least two-way noise signal is specially two-way noise signal or four road noises for this Acoustical signal or greater number of noise signal, the embodiment of the present invention be not construed as limiting this, according to the noise reduction MIC of earpiece side installation Depending on quantity.
It should be understood that earphone is connected by the four-part form pin of earphone cable and the four-part form audio interface of terminal, work.
In S620, demodulates the frequency-division multiplex singal and obtain at least two-way noise signal, specifically, such as in earphone Side is to distribute information according to default frequency spectrum, by the way that at least two-way noise signal to be modulated on different spectral to obtain the frequency division Multiplexed signals can distribute information based on the default frequency spectrum, demodulate the frequency-division multiplex singal to obtain this at least then in terminal side Two-way noise signal.
For example, at least two-way noise signal to be modulated to the process of frequency-division multiplex singal in earpiece side are as follows: will at least two-way First via noise signal A in noise signal is modulated to the first son frequency of Reusespectrum by the frequency spectrum a where noise signal A script It takes, the second road noise acoustical signal B is modulated on the second sub-band of Reusespectrum by the frequency spectrum b where noise signal B script. In the present embodiment, specifically, which includes the corresponding relationship of frequency spectrum a and the first sub-band, and The corresponding relationship of frequency spectrum b and the second sub-band.Accordingly, in terminal side, frequency spectrum distribution information is preset according to this, frequency division is answered It is demodulated with signal, specifically, the signal on the first sub-band in the frequency-division multiplex singal is demodulated, i.e., by first Signal on sub-band is restored on frequency spectrum a, to obtain first via noise signal A；To the signal on the second sub-band into Signal on second sub-band, i.e., be restored on frequency spectrum b, to obtain the second road noise acoustical signal B by row demodulation.
It should also be understood that in embodiments of the present invention, at least two-way noise signal that noise reduction microphone acquires is modulated to It on different frequency spectrums, refers specifically to, by this, at least two-way noise signal is modulated to the corresponding channel of microphone pin of earphone Spectral range different frequency spectrums on.
Specifically, earpiece side handles the frequency division multiplexing of at least two-way noise signal the description of combination Fig. 3 as detailed above, this In repeat no more.
Optionally, in embodiments of the present invention, the protection bandwidth of the frequency-division multiplex singal is not less than preset value.
Specifically, which can be arranged according to specific requirements, such as the protection bandwidth of the frequency-division multiplex singal is 4kHz, the embodiment of the present invention are not construed as limiting this.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal which sends is analog signal；
S620 demodulates the frequency-division multiplex singal and obtains at least two-way noise signal, comprising:
S621 carries out analog-to-digital conversion process to the frequency-division multiplex singal and obtains corresponding digital signal；
S622, demodulation obtain at least two-way noise signal by the frequency-division multiplex singal after analog-to-digital conversion.
Optionally, in embodiments of the present invention, S640 sends the de-noising signal to the earphone, comprising:
The de-noising signal and useful audio signal are sent to the earphone.
Specifically, useful audio signal is, for example, music or speech signal etc..Optionally, in S640, by that will have It is superimposed with audio signal with de-noising signal, obtains mixed signal, sent to earphone.
In embodiments of the present invention, terminal demodulates noise signal from the frequency-division multiplex singal that earphone is sent, generate with Then the de-noising signal of the noise signal opposite in phase sends the de-noising signal to earphone.Therefore, in embodiments of the present invention, Noise signal is handled in terminal side, and generates de-noising signal, so that the module of no setting is required inside earphone noise reduction process, Neng Gou Under the premise of realizing noise reduction, simplify the design of earphone, to improve the portability of earphone.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal and Reference clock signal is modulated to be got on different frequency spectrums, and the reference clock signal for being aligned this, at least believe by two-way noise Number；
S620 demodulates the frequency-division multiplex singal and obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, obtains at least the two-way noise signal and the reference clock signal, and according to the ginseng It examines clock signal and is aligned at least two-way noise signal；
S630, according to this, at least two-way noise signal generates de-noising signal, comprising:
According to this after alignment, at least two-way noise signal generates the de-noising signal.
For example, this at least two-way noise signal includes that two noise reduction microphones being arranged near the left earpiece of earphone acquire Two-way noise signal, the two-way noise signal is after spectrum modulation, it is possible to because modulation algorithm error etc. brings phase inclined Difference, i.e., in frequency-division multiplex singal, there are phase deviations for this two-way noise signal.Terminal receives the frequency-division multiplex singal, And this two-way noise signal obtained after the demodulation is also there are phase deviation, will lead to cannot generate accurate noise reduction letter Number.In order to avoid this problem, when earpiece side carries out frequency division multiplexing processing to multipath noise signal, that is, reference clock letter is provided Number so that terminal when demodulating frequency-division multiplex singal according to the reference clock signal, can be to there are the noise of phase deviation letters It number is modified, to obtain accurate de-noising signal.
Specifically, as shown in figure 3, in earpiece side frequency division multiplexing, by reference clock signal (signal as shown in Figure 3 6) it is assigned on the frequency spectrum of 70kHz, accordingly, terminal demodulates the reference clock signal from the frequency spectrum of 70kHz, according to the ginseng It examines clock signal and is aligned to the multipath noise signal come is demodulated, and then generate accurately noise signal.
In embodiments of the present invention, which can be handset earphone, that is, include call/recording MIC (also referred to as chest Wheat).It when user uses the call/recording MIC, such as records or converses with other users, believe at least two-way noise Number carry out frequency division multiplexing processing when, also include to call/recorded audio signals frequency division multiplexing.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal with should Call on earphone/recording microphone acquisition voice signal is modulated to be got on different frequency spectrums；
S620 demodulates the frequency-division multiplex singal and obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, at least the two-way noise signal and the voice signal is obtained；
The method 600 further include:
S650 handles the voice signal by the speed signal processing circuit of the terminal.
It should be understood that in embodiments of the present invention, earphone passes through frequency-division multiplex singal for call/recorded audio signals and multipath noise Signal is sent to terminal together, accordingly, in terminal side by demodulating to frequency-division multiplex singal, it is logical can to recover this Words/recorded audio signals and multipath noise signal carry out noise reduction process for noise signal, call/recorded audio signals are sent to phase The audio-frequency signal processing module of pass, such as codec chip are handled.Therefore, in embodiments of the present invention, active noise reduction is realized While, it will not influence the business of user's normal use call/recording microphone point, two kinds of events can carry out simultaneously, mutually not Interference, so as to improve satisfaction of users.
Optionally, in embodiments of the present invention, this method 600 further include:
S660, determines whether the earphone supports active noise reduction；
Specifically, the signal made an appointment between earphone and terminal by transmission, to inform whether other side oneself supports to lead Dynamic noise reduction.
S670 is continued by the microphone interface of the terminal to this in the case where determining that the earphone supports active noise reduction Earphone provides the voltage more than preset voltage value.
Optionally, in embodiments of the present invention, S660 determines whether the earphone supports active noise reduction, comprising:
S661, when the terminal is connect with earphone, within a preset period of time by the microphone interface of the terminal to the ear Machine provides the voltage more than preset voltage value；
S662 receives the earphone and supports the first agreement of active noise reduction to believe according to the earphone that is used to indicate that the voltage is sent Number；
S663 determines that the earphone supports active noise reduction according to first previously arranged signal.
Detailed process description as detailed above, which is not described herein again.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band.
Optionally, in embodiments of the present invention, S660 determines whether the earphone supports active noise reduction, comprising:
S664 receives the second previously arranged signal for being used to ask whether to support active noise reduction of earphone transmission；
S665 determines that the earphone supports active noise reduction according to second previously arranged signal；
S666 sends the third previously arranged signal for being used to indicate the terminal and supporting active noise reduction to the earphone.
Optionally, in embodiments of the present invention, which includes the signal of supersonic band, second agreement Signal is the unrecognized audio signal of human ear.
Specifically, which is a special audio signal, for example, this nature of 1k, 8k or 16k The clean audio signal not having very much.It should be understood that second reservation signal and third reservation signal for earphone and terminal all It is well known.
In embodiments of the present invention, earphone acquisition noise signal, and noise signal is supplied to terminal processes, pass through reception The de-noising signal that terminal is sent, is played out de-noising signal by earpiece, to achieve the purpose that active noise reduction.Therefore, exist In the embodiment of the present invention, the module for noise reduction process that no setting is required inside earphone can simplify earphone under the premise of realizing noise reduction Design, to improve the portability of earphone.
In embodiments of the present invention, in addition to believing including at least two-way noise in the frequency-division multiplex singal that earphone is sent to terminal Extra can also include but is not limited to other sensors signal, such as earphone in the measuring signal of level sensor.It should be understood that Sensor measurement signal can be sent to terminal by a channel by frequency-division multiplex singal, and terminal crosses frequency division multiplexing letter to this Number demodulation after the available sensor measurement signal, so as to obtain the more information about earphone local environment.
Optionally, in embodiments of the present invention, the frequency-division multiplex singal be by by this at least two-way noise signal with should The sensor measurement signal of sensor acquisition on earphone, which is modulated to, to be got on different frequency spectrums；
S620 demodulates the frequency-division multiplex singal and obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, at least the two-way noise signal and the sensor measurement signal is obtained；
This method 600 further include:
S680 handles the sensor measurement signal by the sensor signal processing circuit of the terminal.
Specifically, the sensor such as on earphone is earphone in level sensor, by this earphone sensor measurement in place The sensor measurement signal, the sensor measurement signal can indicate whether earphone is worn on ear, such as can measure earpiece The distance between ear.
It should be understood that in terminal side, demodulates to obtain the demodulation according to the frequency-division multiplex singal and obtain sensor measurement signal, when When determining distance of the earpiece of earphone apart from ear beyond threshold value, that is, when determining that earphone leaves ear, then stop to send to earphone Audio signal (assuming that before this, terminal sends audio signal to earphone always)；Conversely, terminal keeps sending audio to earphone Signal.
It should be understood that in embodiments of the present invention, which can also be the signal of other sensors acquisition, E.g. accelerometer, gyroscope or other sensors for measuring human body sport parameter etc..
Therefore, in embodiments of the present invention, by sending sensor measurement signal to terminal, terminal can be allowed to know more About the information of earphone local environment, so as to adjust the communication between terminal and earphone neatly, in real time.
As shown in figure 14, the embodiment of the present invention also provides a kind of system 700 for active noise reduction, which includes above The earphone 710 and terminal 720 that embodiment provides.
Specifically, which is earphone 100, earphone 200 or the earphone 300 that foregoing embodiments provide；Terminal 720 The terminal 400 provided for foregoing embodiments.
The earphone 710 is connect with terminal 720 by the four-part form audio interface of the four-part form pin on earphone cable and terminal.
Specifically, as shown in figure 15, the noise reduction MIC acquisition noise multichannel in earphone 710 provided in an embodiment of the present invention is made an uproar Acoustical signal, signal processing module 711 (signal processing circuit 120 or integrated treatment circuit corresponding to foregoing embodiments description 320) by carrying out frequency division multiplexing processing to the noise signal, frequency-division multiplex singal is obtained, is then led to by the uplink of terminal 720 Road 722 sends the frequency-division multiplex singal to the terminal 720.Signal processing module 721 in the terminal 720 (corresponds to real above Apply the signal processing circuit 420 that example describes) by demodulating the frequency-division multiplex singal, the noise signal is recovered, and generate and be somebody's turn to do The de-noising signal of noise signal opposite in phase sends mixed signal simultaneously finally by down going channel 723 to earphone 710, should Mixed signal includes de-noising signal, can also include useful audio signal, such as music or voice signal.Optionally, this is mixed Closing signal is useful audio signal and the superimposed signal of de-noising signal.
From the foregoing, it will be observed that active noise reduction may be implemented in system provided in an embodiment of the present invention.And the embodiment of the present invention mentions It does not include the processing module for generating de-noising signal in the earphone of confession, without the powerup issue for solving the processing module, phase Than the structure of earphone can be greatly simplified under the premise of realizing active noise reduction in existing ANC earphone, reduce its volume, Production cost is reduced, also can be improved the reliability of earphone.
In addition, in embodiments of the present invention, the processing module for being used to generate de-noising signal is placed as terminal side, Neng Gouli With the powerful chip ability in terminal side, can have better performance performance, and scalability is more preferable.Such as the terminal is mobile phone, it can Directly upgrade mobile phone side software, directly obtains the promotion of performance, and a plurality of earphones using the technology can be adapted to.Therefore, The scheme of active noise reduction provided in an embodiment of the present invention, compared with the prior art, using more flexible.
In embodiments of the present invention, active noise reduction may be implemented in the combination of earphone 300 and terminal 500.And the present invention is implemented It does not include the processing module for generating de-noising signal in the earphone 300 that example provides, without the power supply for solving the processing module Problem under the premise of realizing active noise reduction, can be greatly simplified the structure of earphone compared to existing ANC earphone, reduce Its volume reduces production cost, also can be improved the reliability of earphone.
It should also be understood that first, second, third, fourth and the various digital numbers that are referred to herein are only for convenience of description The differentiation of progress is not intended to limit the invention the range of embodiment.It should be understood that character "/" herein, typically represent front and back and close Connection object is a kind of relationship of "or".
It should be understood that in various embodiments of the present invention, magnitude of the sequence numbers of the above procedures are not meant to execute suitable Sequence it is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention Process constitutes any restriction.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps, additionally it is possible to be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are studied carefully Unexpectedly it is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technique people Member can use different methods to achieve the described function each specific application, but this realization is it is not considered that super The scope of the present invention out.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (38)

1. a kind of earphone characterized by comprising
Noise reduction control circuit for determining whether terminal supports active noise reduction, and is determining the terminal support active noise reduction In the case of, the control signal for being used to indicate acquisition noise signal is sent to noise reduction microphone；The noise reduction microphone is used for, according to The control signal, acquisition at least two-way noise signal；
Signal processing circuit obtains frequency division multiplexing letter for at least two-way noise signal to be modulated to different frequency spectrums Number；
Transmission circuit sends the frequency-division multiplex singal to terminal for the microphone pin by the earphone, wherein described Transmission circuit is also used to, and receives the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, and the de-noising signal is used In at least two-way noise signal progress noise reduction；
Loudspeaker, the de-noising signal sent for playing the terminal.
2. earphone according to claim 1, which is characterized in that the earphone further include:
Power circuit, for obtaining the voltage that the terminal provides from the microphone pin, and according to the voltage to described Noise reduction microphone provides power supply.
3. earphone according to claim 1 or 2, which is characterized in that the signal processing circuit is specifically used for, by described in extremely Few two-way noise signal and reference clock signal are modulated on different frequency spectrums, obtain the frequency-division multiplex singal, the ginseng Clock signal is examined for being aligned at least two-way noise signal.
4. earphone according to claim 1 or 2, which is characterized in that the earphone further include:
Call/recording microphone, for acquiring voice signal；
The signal processing circuit is specifically used for, and at least two-way noise signal and the voice signal are modulated to difference Frequency spectrum on, obtain the frequency-division multiplex singal.
5. earphone according to claim 1 or 2, which is characterized in that the noise reduction control circuit is specifically used for, when from described When the voltage that the terminal that microphone pin obtains provides is more than preset voltage value, determine that the terminal supports active noise reduction；
The transmission circuit is also used to, and by the microphone pin, the transmission of Xiang Suoshu terminal is used to indicate the earphone and also props up Hold the first previously arranged signal of active noise reduction.
6. earphone according to claim 1 or 2, which is characterized in that
The transmission circuit is also used to, and Xiang Suoshu terminal sends the second previously arranged signal for asking whether support active noise reduction；
The transmission circuit is also used to, and receives the third previously arranged signal that the terminal is sent according to second previously arranged signal, institute It states third previously arranged signal and is used to indicate the terminal support active noise reduction；
The noise reduction control circuit is specifically used for, according to the received third previously arranged signal of the transmission circuit, determine described in Terminal supports active noise reduction.
7. earphone according to claim 1 or 2, which is characterized in that the earphone further include:
Sensor, for acquiring sensor measurement signal；
The signal processing circuit is specifically used for, and at least two-way noise signal is modulated to the sensor measurement signal On different frequency spectrums, the frequency-division multiplex singal is obtained.
8. earphone according to claim 1 or 2, which is characterized in that the noise reduction microphone is numeric type microphone, described Earphone further include:
D/A converting circuit, the frequency-division multiplex singal for obtaining the signal processing circuit are handled as analog signal；
Wherein, the transmission circuit is specifically used for, and sends the analog signal to the terminal by the microphone pin.
9. earphone according to claim 1 or 2, which is characterized in that the protection bandwidth of the frequency-division multiplex singal is not less than Preset value.
10. earphone according to claim 1 or 2, which is characterized in that the transmission circuit is specifically used for, described in reception While de-noising signal, the useful audio signal that the terminal is sent also is received；
The loudspeaker is specifically used for, and while playing the de-noising signal, also plays the useful audio signal.
11. a kind of terminal characterized by comprising
Transmission circuit receives the frequency-division multiplex singal that earphone is sent for the microphone interface by terminal, wherein the frequency division Multiplexed signals is by the way that at least two-way noise signal of the noise reduction microphone acquisition on the earphone is modulated to different frequency spectrums On get, the microphone interface connect with the microphone pin of the earphone；
Signal processing circuit obtains at least two-way noise signal for demodulating the frequency-division multiplex singal；
Dolby circuit generates de-noising signal for at least two-way noise signal according to signal processing circuit determination, The de-noising signal is used to carry out noise reduction at least two-way noise signal；
The transmission circuit is also used to, and Xiang Suoshu earphone sends the de-noising signal；
The terminal further include:
Control circuit, for passing through the microphone interface of the terminal in the case where determining that the earphone supports active noise reduction Continue to provide the voltage more than preset voltage value to the earphone.
12. terminal according to claim 11, which is characterized in that the frequency-division multiplex singal is by least two by described in Road noise acoustical signal and reference clock signal are modulated to be got on different frequency spectrums, and the reference clock signal is for being aligned At least two-way noise signal；
The signal processing circuit is also used to, and obtains the reference clock signal, and root by demodulating the frequency-division multiplex singal According to the reference clock signal alignment at least two-way noise signal.
13. terminal according to claim 11 or 12, which is characterized in that the frequency-division multiplex singal is described extremely by general Few two-way noise signal is modulated on different frequency spectrums from the call on the earphone/recording microphone acquisition voice signal and obtains It gets；
Signal processing circuit is also used to, and obtains the voice signal by demodulating the frequency-division multiplex singal；
The terminal further include:
Speed signal processing circuit, for handling the voice signal.
14. terminal according to claim 11 or 12, which is characterized in that
The control circuit is specifically used for, and when the terminal is connect with earphone, passes through the terminal within a preset period of time Microphone interface provides the voltage more than preset voltage value to the earphone；
The transmission circuit is also used to, and the earphone that is used to indicate for receiving that the earphone sends is supported the first of active noise reduction about Determine signal；
The control circuit is used for, and according to first previously arranged signal, determines that the earphone supports active noise reduction.
15. terminal according to claim 11 or 12, which is characterized in that
The transmission circuit is specifically used for, and before receiving the frequency-division multiplex singal, receives being used for for the earphone transmission Ask whether the second previously arranged signal of support active noise reduction；
The control circuit is used for, and according to second previously arranged signal, determines that the earphone supports active noise reduction；
The transmission circuit is also used to, and Xiang Suoshu earphone, which is sent, is used to indicate the third agreement letter that the terminal supports active noise reduction Number.
16. terminal according to claim 11 or 12, which is characterized in that the frequency-division multiplex singal is described extremely by general Few two-way noise signal is modulated on different frequency spectrums from the sensor measurement signal of the sensor acquisition on the earphone and obtains It arrives；
Signal processing circuit is also used to, and by demodulating the frequency-division multiplex singal, obtains the sensor measurement signal；
The terminal further include:
Sensor signal processing circuit, for handling the sensor measurement signal.
17. terminal according to claim 11 or 12, which is characterized in that the received frequency division multiplexing of transmission circuit Signal is analog signal；
The signal processing circuit is specifically used for, before demodulating the frequency-division multiplex singal, to the frequency-division multiplex singal into Row analog-to-digital conversion process obtains corresponding digital signal.
18. terminal according to claim 11 or 12, which is characterized in that the frequency-division multiplex singal protects bandwidth not low In preset value.
19. terminal according to claim 11 or 12, which is characterized in that the transmission circuit is specifically used for, in Xiang Suoshu When terminal sends the de-noising signal, useful audio signal also is sent to the terminal.
20. a kind of method of noise reduction characterized by comprising
Pass through the noise reduction microphone acquisition at least two-way noise signal on earphone；
At least two-way noise signal is modulated on different frequency spectrums, frequency-division multiplex singal is obtained；
The frequency-division multiplex singal is sent to terminal by the microphone pin of the earphone；
Receive the de-noising signal that the terminal is sent according to the frequency-division multiplex singal, the de-noising signal be used for it is described at least Two-way noise signal carries out noise reduction；
Play the de-noising signal that the terminal is sent；
Wherein, the noise reduction microphone acquisition at least two-way noise signal by earphone, comprising:
Determine whether the terminal supports active noise reduction；
It is described at least by the noise reduction microphone acquisition on the earphone in the case where determining that the terminal supports active noise reduction Two-way noise signal.
21. according to the method for claim 20, which is characterized in that described to be modulated at least two-way noise signal not On same frequency spectrum, frequency-division multiplex singal is obtained, comprising:
At least two-way noise signal and reference clock signal are modulated on different frequency spectrums, the frequency division multiplexing is obtained Signal, the reference clock signal is for being aligned at least two-way noise signal.
22. the method according to claim 20 or 21, which is characterized in that the method also includes:
Voice signal is acquired by the call on the earphone/recording microphone；
It is described that at least two-way noise signal is modulated on different frequency spectrums, obtain frequency-division multiplex singal, comprising:
At least two-way noise signal and the voice signal are modulated on different frequency spectrums, the frequency division multiplexing is obtained Signal.
23. the method according to claim 20 or 21, which is characterized in that whether the determination terminal is supported actively to drop It makes an uproar, comprising:
When the voltage that the terminal obtained from the microphone pin provides is more than preset voltage value, the terminal branch is determined Hold active noise reduction；
The method also includes:
By the microphone pin, the transmission of Xiang Suoshu terminal is used to indicate the earphone and also supports the first of active noise reduction to arrange Signal.
24. the method according to claim 20 or 21, which is characterized in that whether the determination terminal is supported actively to drop It makes an uproar, comprising:
The second previously arranged signal for asking whether support active noise reduction is sent to the terminal；
The third previously arranged signal that the terminal is sent according to second previously arranged signal is received, the third previously arranged signal is for referring to Show that the terminal supports active noise reduction；
According to the third previously arranged signal, determine that the terminal supports active noise reduction.
25. the method according to claim 20 or 21, which is characterized in that the method also includes:
Sensor measurement signal is acquired by the sensor on the earphone；
It is described that at least two-way noise signal is modulated on different frequency spectrums, obtain frequency-division multiplex singal, comprising:
At least two-way noise signal is modulated on different frequency spectrums from the sensor measurement signal, obtains the frequency division Multiplexed signals.
26. the method according to claim 20 or 21, which is characterized in that the noise reduction microphone is numeric type microphone, The microphone pin by the earphone sends the frequency-division multiplex singal to terminal, comprising:
The frequency-division multiplex singal is subjected to digital-to-analogue conversion, obtains the corresponding analog signal of the frequency-division multiplex singal；
It is sent by the microphone pin to the terminal and passes through the analog signal.
27. the method according to claim 20 or 21, which is characterized in that the frequency-division multiplex singal protects bandwidth not low In preset value.
28. the method according to claim 20 or 21, which is characterized in that the reception terminal is multiple according to the frequency division The de-noising signal sent with signal, comprising:
The de-noising signal that the terminal is sent according to the frequency-division multiplex singal is received, and receives the useful sound that the terminal is sent Frequency signal；
The de-noising signal for playing the terminal and sending, comprising:
The de-noising signal is played, and plays the useful audio signal.
29. a kind of method of noise reduction characterized by comprising
The frequency-division multiplex singal that earphone is sent is received by the microphone interface of terminal, wherein the frequency-division multiplex singal is logical It crosses for at least two-way noise signal of the noise reduction microphone acquisition on the earphone to be modulated to and be got on different frequency spectrums, institute Microphone interface is stated to connect with the microphone pin of the earphone；
It demodulates the frequency-division multiplex singal and obtains at least two-way noise signal；
De-noising signal is generated according at least two-way noise signal, the de-noising signal is used to believe at least two-way noise Number carry out noise reduction；
The de-noising signal is sent to the earphone；
The method also includes:
Determine whether the earphone supports active noise reduction；
In the case where determining that the earphone supports active noise reduction, continued by the microphone interface of the terminal to the earphone Voltage more than preset voltage value is provided.
30. according to the method for claim 29, which is characterized in that the frequency-division multiplex singal is by least two by described in Road noise acoustical signal and reference clock signal are modulated to be got on different frequency spectrums, and the reference clock signal is for being aligned At least two-way noise signal；
The demodulation frequency-division multiplex singal obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, obtains at least two-way noise signal and the reference clock signal, and according to institute State the reference clock signal alignment at least two-way noise signal；
It is described that at least two-way noise signal generates de-noising signal according to, comprising:
At least two-way noise signal generates the de-noising signal according to after alignment.
31. the method according to claim 29 or 30, which is characterized in that the frequency-division multiplex singal is described extremely by general Few two-way noise signal is modulated on different frequency spectrums from the call on the earphone/recording microphone acquisition voice signal and obtains It gets；
The demodulation frequency-division multiplex singal obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, at least two-way noise signal and the voice signal are obtained；
The method also includes:
The voice signal is handled by the speed signal processing circuit of the terminal.
32. the method according to claim 29 or 30, which is characterized in that whether the determination earphone is supported actively to drop It makes an uproar, comprising:
When the terminal is connect with earphone, mentioned within a preset period of time by the microphone interface of the terminal to the earphone For being more than the voltage of preset voltage value；
Receive the first previously arranged signal for being used to indicate the earphone and supporting active noise reduction that the earphone is sent according to the voltage；
According to first previously arranged signal, determine that the earphone supports active noise reduction.
33. the method according to claim 29 or 30, which is characterized in that whether the determination earphone is supported actively to drop It makes an uproar, comprising:
Receive the second previously arranged signal for being used to ask whether to support active noise reduction that the earphone is sent；
According to second previously arranged signal, determine that the earphone supports active noise reduction；
The third previously arranged signal for being used to indicate the terminal and supporting active noise reduction is sent to the earphone.
34. the method according to claim 29 or 30, which is characterized in that the frequency-division multiplex singal is described extremely by general Few two-way noise signal is modulated on different frequency spectrums from the sensor measurement signal of the sensor acquisition on the earphone and obtains It arrives；
The demodulation frequency-division multiplex singal obtains at least two-way noise signal, comprising:
The frequency-division multiplex singal is demodulated, at least two-way noise signal and the sensor measurement signal are obtained；
The method also includes:
The sensor measurement signal is handled by the sensor signal processing circuit of the terminal.
35. the method according to claim 29 or 30, which is characterized in that the frequency-division multiplex singal that the earphone is sent For analog signal；
The demodulation frequency-division multiplex singal obtains at least two-way noise signal, comprising:
Analog-to-digital conversion process is carried out to the frequency-division multiplex singal and obtains corresponding digital signal；
Demodulation obtains at least two-way noise signal by the frequency-division multiplex singal after analog-to-digital conversion.
36. the method according to claim 29 or 30, which is characterized in that the frequency-division multiplex singal protects bandwidth not low In preset value.
37. the method according to claim 29 or 30, which is characterized in that described to send the noise reduction letter to the earphone Number, comprising:
The de-noising signal and useful audio signal are sent to the earphone.
38. a kind of system for active noise reduction, which is characterized in that including any one of such as claim 1 to claim 10 The earphone and the terminal as described in any one of claim 11 to claim 19.
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CN112785998B (en) * 2020-12-29 2022-11-15 展讯通信（上海）有限公司 Signal processing method, equipment and device
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