CN203721181U - Household active noise reduction device - Google Patents
Household active noise reduction device Download PDFInfo
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- CN203721181U CN203721181U CN201420060421.9U CN201420060421U CN203721181U CN 203721181 U CN203721181 U CN 203721181U CN 201420060421 U CN201420060421 U CN 201420060421U CN 203721181 U CN203721181 U CN 203721181U
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- signal transmitter
- reference signal
- sound source
- error signal
- denoiser
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Abstract
The utility model discloses a household active noise reduction device which comprises a reference signal transmitter (1) used for receiving a primary sound source and outputting a reference signal, an error signal transmitter (2) used for receiving a sound source signal near a noise reduction point and outputting an error signal, an adaptive processing host (4) used for processing the reference signal and the error signal and generating an output signal, and a flat panel speaker (3) used for receiving the output signal sent by the adaptive processing host (4) and emitting a secondary sound source capable of offsetting the primary sound source. The output signal of the adaptive processing host (4) passes through a power amplifier (5) and is then transmitted to the flat panel speaker (3), and the flat panel speaker (3) is connected with a subwoofer. The household active noise reduction device can achieve a good noise reduction effect without the need to close doors and windows, is low in design difficulty and low in cost, and is highly decorative to rooms.
Description
Technical field
The utility model relates to a kind of household electrical appliance, is specifically related to a kind of family expenses denoiser for reducing room noise.
Background technology
In bustling city or easily near traffic main artery, noise becomes large public hazards of environmental pollution day by day, is perplexing people always.Research shows, noise, in 55～60dB scope, can make people feel put about, and in 60～65dB scope, can make worried degree greatly increase, and more than 65dB, health may be endangered.Noise effect people's physical and mental health, damage hearing and related system, reduction work efficiency, the serious security incident that even causes.
People are carrying out unremitting pursue to high-quality family life, wish that the scientific and technological level being showing improvement or progress day by day brings people a quieter and comfortable New Times, eliminate noise, thus build environmental protection, quietly home environment to people work normally, studying and living produces very big meaning.
Generally with sound absorption, sound insulation, acoustic damping processing etc., low noise method is fallen now, the control mechanism of these methods is to be reached and fallen low noise object by the interaction consumption acoustic wave energy of noise sound wave and acoustical material or acoustic construction, is referred to as passive noise elimination method.Reducing in the family outside noise, to adopt the method for closing the window be exactly a kind of passive noise elimination method.The following problem of passive noise elimination method ubiquity:
1, the medium-term and long-term air of closing the window of family can not get nature circulation, cannot breathe extraneous fresh air, does not meet people and pursue the requirement of high-quality life, because people expect is to be washed in natural fresh air, lives the family life of green, environmental protection;
2, low frequency (especially 200Hz is following) noise penetration power is strong, generally needs bulky protective materials, even like this, low-frequency noise protection is also very difficult.
With the closely-related noise of people's daily life be but main mainly with low-frequency noise greatly, as the noise of the generations such as household electrical appliance hollow mediation refrigerator, occupy the noise of the vehicles such as outdoor automobile, subway or aircraft through out-of-date generation, this just forces people that it is being controlled and is being looked for another way, the Adaptive Signal Processing technology of utilizing growing up is in recent years carried out the method for Active Noise Control (adaptive active noise cancellation), for a new road has been opened up in noise control.Active noise control using is produced and equates and the secondary sound source of single spin-echo in this place's noise amplitude with noise source at designated space by certain means, makes it finally to reach with noise source stack the object of abating noises.After 19th-century eighties, adaptive filtering theory is developed fully, " self-adaptation " characteristic of this wave filter can automatic tracking system change, and therefore it can be applied in the noise control system of time to time change, forms adaptive active noise control system.The criterion that sef-adapting filter is set in advance according to certain, the system performance that regulates itself by adaptive algorithm is to reach needed output requirement.
Noise source (elementary sound source) characteristic in family's actual environment and the physical parameter (as temperature, gas velocity etc.) in sound space often change in time, if realize good noise reduction, when the transport function of active noise controller must be, become, it is adaptive namely requiring controller.Auto-adaptive filtering technique is applied to Active noise control using, is the focus of current Technique of Active Noise Control research.
The control of adaptive active noise can solve the shortcoming without source noise control, but according to the feature of adaptive active noise control system, while adopting single channel system (only comprising a secondary sound source and an error signal transmitter), only carry out noise reduction process for one, space point, and must have certain noise reduction space as the denoiser using in family room, use multi-channel system (comprising plural secondary sound source and error signal transmitter) to meet the demands, port number increase can expand muffler space, improve noise reduction, but along with increasing of port number, the complexity of controller design will increase considerably, denoiser cost raises, be difficult to enter on a large scale huge numbers of families, generally only use industrial at present, in military affairs.Multi-channel system can may be the combination of these classification specific to some examples, as adaptive feedback control system.
If can design a family expenses adaptive active denoiser, must become the another household electrical appliance on way of great use after the ripe household electrical appliance such as televisor, washing machine, refrigerator and air conditioner.
Utility model content
Technical problem to be solved in the utility model is, a kind of Household active denoiser is provided, and this denoiser can realized good noise reduction effect without close the doors and windows in the situation that, and can not increase the design difficulty of controller, and cost is low.
For solving the problems of the technologies described above, Household active denoiser described in the utility model comprises
Be used for the reference signal transmitter that receives elementary sound source and export reference signal;
For receiving the error signal transmitter of near the sound-source signal of noise reduction point output error signal;
For reference signal and error signal being processed and are produced the self-adaptive processing main frame of output signal;
Adapt to the output signal sent of processing host the panel speaker that sends the secondary sound source that can disappear mutually with elementary sound source for being received from, the output signal of described self-adaptive processing main frame is delivered to panel speaker through power amplifier, described panel speaker is connected with bass sound equipment, this bass sound equipment mainly sends low frequency signal (80Hz is following), can make up panel speaker low frequency (80kHz the is following) shortcoming that response sensitivity is low, and the sound equipment directive property that frequency is lower is poorer, more close to low frequency plane wave.
Further, in described reference signal transmitter, self-adaptive processing main frame and error signal transmitter, be equipped with the wireless module for radio communication.
Again further, in described reference signal transmitter, be also provided with the stereo audio codec for the treatment of elementary sound source, and this stereo audio codec is electrically connected with the wireless module being arranged in reference signal transmitter, described reference signal transmitter is by rechargeable battery powered.
Further, in described self-adaptive processing main frame, be also provided with stereo audio codec and digital signal processor, be electrically connected successively with the wireless module being arranged in self-adaptive processing main frame, described main frame is powered by AC/DC modular power source.
Further, in described error signal transmitter, be also provided with stereo audio codec, this stereo audio codec is electrically connected with the wireless module being arranged in error signal transmitter, and this error signal transmitter is by rechargeable battery powered.
Further, described stereo audio codec adopts TLV320AIC23 chip or SPCE061A single-chip microcomputer.
Further, described digital signal processor adopts FPGA, TMS6455 or TS201.
The utility model adopts after technique scheme, has the following advantages:
1, the utility model is to use in the situation that family room window is opened, and when making family room noise reduction obtain quiet environment, can make room inner air and outer air naturally circulate;
2, the utility model can reduce low-frequency noise more effectively with respect to passive sound suppressor;
3, the utility model has substituted existing adaptive active denoiser point source loudspeaker used (being the conventional electric loudspeaker that sound source scope is confined to spatial point) with panel speaker, send plane sound-source signal by panel speaker, expand noise reduction space, therefore the utility model is without increasing port number, but there is same noise reduction with multi-channel active denoiser, and cost is low;
4, panel speaker coordinates bass sound equipment, makes up panel speaker low frequency (80kHz the is following) shortcoming that response sensitivity is low, and the lower sound equipment directive property of frequency is poorer, more close to low frequency plane wave.
5, the utility model uses in the family and can not destroy original finishing, good concealment, even can also increase attractive in appearance and decorate for family room, such as panel speaker can landscape painting, the form such as cross embroidery hangs on the wall, reference signal transmitters etc. can merge with the object such as vase, and its aesthetics is splendid.
Brief description of the drawings
Accompanying drawing 1 is control principle schematic diagram of the present utility model;
Accompanying drawing 2 is the noise time domain waveform figure outside window;
The secondary sound source time domain waveform figure of accompanying drawing 3 for exporting after auto adapted filtering;
Accompanying drawing 4 is all square normalization time domain waveform figure of error pick-up place error signal after noise cancellation;
Accompanying drawing 5 is syndeton schematic diagram of the present utility model.
Number in the figure: 1-reference signal transmitter; 2-error signal transmitter; 3-panel speaker; 4-self-adaptive processing main frame; 5-power amplifier; 1 ＇-reference signal sensor; 2 ＇-error-sensing element; 3 ＇-loudspeaker; 4 ＇-active adaptive noise controller.
Embodiment
Consider that existing family causes not circulation naturally of fresh air as closed the window etc. without source noise control, the utility model aims to provide a kind of adaptive active Noise control program, wherein Fig. 1 is adaptive active noise control principle drawing, enter indoor (as in Fig. 1 left side arrow as shown in) as elementary sound source by the window of opening from the noise outside family room window, receiving elementary sound source near near reference signal sensor 1 ＇ window, reference signal is sent to adaptive active noise controller 4 ＇, produce output signal by 4 ＇ of adaptive active noise controller after corresponding self-adaptive digital signal Processing Algorithm and be sent to power amplifier 5, the electric signal that reaches certain power after power amplifier 5 drives drives sound wave that loudspeaker 3 ＇ send corresponding power as secondary sound source, can compare at space same point secondary sound source and elementary sound source amplitude, phase approximation differs 180 °, secondary signal and elementary noise produce destructive interference, thereby the noise in this region is minimized, the signal obtaining according to error pick-up 2 ＇ regulates the coefficient of sef-adapting filter by adaptive algorithm, make the noise signal minimum at error pick-up 2 ＇ places.
As can be seen from Figure 1, the self-adaptive control module in active adaptive noise controller 4 ＇ is the core of whole system, and wherein the quality of self-adaptive control module algorithm determines effect and the efficiency of eliminating the noise.Common lowest mean square (LMS) ERROR ALGORITHM is to adjust output signal generation secondary sound source according to reference signal and error signal, makes the acoustic wave energy minimum at error pick-up place reach the object of noise elimination.Common LMS algorithm has the advantages that to calculate simply and be easy to realization, thereby becomes one of the most general algorithm of application, but it is affected greatly by gradient noise, and speed of convergence is slow.For accelerating system speed of convergence and requirement of real time, the utility model adopts Normalized LMS Algorithm.Specifically, following formula is followed in its weights adjustment:
y(n)=W
T(n)X(n)
W(n+1)=W(n)+αe(n)X(n)/(r+X
T?(n)X(n))
In formula, X (n) is elementary sound-source signal, y (n) is secondary sound source signal, W (n) is the weights that will adjust, e (n) is error signal, the value of α is (the utility model gets 0.005) between 0～2, and r is a less number (the utility model gets 0.001), is used for ensureing to work as X
t(n), when the value of X (n) is very little, the variable quantity of weights is not too large.
Fig. 2, Fig. 3, Fig. 4 adopt Normalized LMS Algorithm to carry out the simulation waveform figure of family room noise reduction.Wherein Fig. 2 is the noise time domain waveform figure outside window, and Fig. 3 is the secondary sound source time domain waveform figure exporting after auto adapted filtering, and Fig. 4 is all square normalization time domain waveform figure of error pick-up place error signal after noise cancellation.Be that energy noise reduction after the adjustment convergence of 200 left and right of noise is obvious from square error Fig. 2 to Fig. 4 can find out noise cancellation.
Fig. 1 and Fig. 2 to Fig. 4 carry out noise reduction for one, space point, are single channel system, in channel system, only comprise a secondary sound source and an error pick-up, can find out that from Fig. 2 to Fig. 4 noise reduction is really obvious.Multi-channel system comprises plural secondary sound source and error pick-up, and multi-channel system can expand muffler space, improves noise reduction, but along with the increasing of port number, the complexity of controller design will increase considerably.May be the combination of these classification specific to some examples, as adaptive feedback control system.
Must have certain noise reduction space as the denoiser using in family room, use multi-channel system really can meet the demands, but port number increase raises denoiser cost, is difficult to enter on a large scale huge numbers of families.Consider as elementary sound source and be approximately plane wave from the noise outside family room window, utilize panel speaker to be approximately the feature of plane sound source, the utility model changes the loudspeaker in Fig. 1 into panel speaker by point source loudspeaker (conventional electric loudspeaker), the muffler space of single channel active noise reduction device can be expanded, meet domestic consumer's needs.Panel speaker technology is ripe, has ready-made product on market.Various landscape paintings can be sticked according to living environment or personal like in panel speaker surface, on family room wall, hang up the environment that the panel speaker that posts landscape painting can not destroy room, can keep the matching in color of room for those more luxurious rooms of finishing especially, make to seem attractive in appearance, elegant in room.
Embodiment 1 of the present utility model:
As shown in Figure 5, Household active denoiser described in the utility model comprises
Be used for the reference signal transmitter 1 that receives elementary sound source and export reference signal;
For receiving the error signal transmitter 2 of near the sound-source signal of noise reduction point output error signal;
For reference signal and error signal being processed and are produced the self-adaptive processing main frame 4 of output signal;
Adapt to the output signal sent of processing host 4 panel speaker 3 that sends the secondary sound source that can disappear mutually with elementary sound source for being received from, the output signal of described self-adaptive processing main frame 4 is delivered to panel speaker 3 through power amplifier 5, described panel speaker 3 is connected with bass sound equipment, particularly, this bass sound equipment is electrically connected with panel speaker by frequency divider.
In described reference signal transmitter 1, self-adaptive processing main frame 4 and error signal transmitter 2, be equipped with the wireless module for radio communication.
In described reference signal transmitter 1, be also provided with the stereo audio codec for the treatment of elementary sound source, and this stereo audio codec is electrically connected with the wireless module being arranged in reference signal transmitter 1, described reference signal transmitter 1 is by rechargeable battery powered.
In described self-adaptive processing main frame 4, be also provided with stereo audio codec and digital signal processor, be electrically connected successively with the wireless module being arranged in main frame 4, described self-adaptive processing main frame 4 is powered by AC/DC modular power source.
In described error signal transmitter 2, be also provided with stereo audio codec, this stereo audio codec is electrically connected with the wireless module being arranged in error signal transmitter 2, and this error signal transmitter 2 is by rechargeable battery powered.
Stereo audio codec described in the utility model should have AD, DA and microphone signal modulate circuit simultaneously, be built-in with anti-aliasing analog filter, there is the wave digital lowpass filter to digital signal filter, can carry out drive amplification to the simulating signal of DA output.Specifically can adopt TI company, it is Texas Instrument, (SPCE061A single-chip microcomputer sampling rate is low for the SPCE061A single-chip microcomputer that a high-performance stereo audio codec TLV320AIC23 chip that Texas Instruments releases or Taiwan Ling Yang Science and Technology Ltd. produce, digital quantity figure place is few, and the present embodiment adopts TLV320AIC23 chip.）。
Digital signal processor described in the utility model adopts FPGA and some other High Performance DSP (digital singnal processor, digital signal processor), such as TMS6455 or TS201.Wherein FPGA high performance signal processor (Field-Programmable Gate Array), i.e. field programmable gate array; TMS6455 is a kind of High Performance DSP that TI company produces; TS201 is a kind of High Performance DSP that ADI company of the U.S. produces.The present embodiment adopts FPGA digital signal processor.
Above wireless module directly adopts commercially available wireless singlechip.
Reference signal transmitter 1 is placed on the windowsill of opening window, the noise coming from window outside converts electric signal to by electret capacitor microphone and is sent to the TLV320AIC23 chip setting within it, this chip internal is integrated bias voltage and the impact damper of electret capacitor microphone, mimic channel function that simultaneous altitude is integrated, the requirement that the ultra-weak electronic signal of microphone output can be nursed one's health to A/D converter input signal.Modulus in TLV320AIC23 chip and digital to analog converter have used many bits sigma-delta technique, and in inside the integrated digital interpolation wave filter of high sampling rate.The digital transmission word length of this device can be 16,20,24,32bit, and it supports the sampling rate of 8～96kHz.In the utility model, the sampling rate of A/D is set to 48kHz, and digital quantity is set to 16, arranges like this and can ensure collected reference signal digital quantity high-fidelity.The digital signal that in TLV320AIC23 chip, integrated digital interpolation wave filter is exported A/D converter is carried out digital filtering and is exported from digital audio interface with DSP pattern.The power consumption of this chip is less than 23mW, can work long hours with rechargeable battery.After reference signal transmitter 1 powers on, wireless singlechip initialize routine is set to main equipment mode of operation by the control interface TLV320AIC23 of TLV320AIC23 chip, after powering on like this, TLV320AIC23 chip will carry out continuous sampling with the parameter request of setting to reference signal, outputs to continuously the digital I/O mouth of wireless singlechip with reference to the digital quantity of signal by digital audio interface with DSP pattern.The digital I/O mouth that wireless singlechip is connected with the digital audio interface of TLV320AIC23 is set to the digital audio interface DSP pattern working method of compatibility mutually with TLV320AIC23, and the radio-frequency transmissions circuit that the digital quantity of the digital audio interface output of TLV320AIC23 is input to Embedded by wireless singlechip is like this gone out by antenna transmission.The circuit of reference signal transmitter 1 is arranged in a vase, and emitting antenna 2 centimeter length, twist in vase, and vase inserts a branch of plastic flower, and microphone is hidden in plastic flower, and charging plug is collapsible at the bottom of vase.Error signal transmitter 2 is just the same with reference signal transmitter 1 circuit and mounting structure, unique different be that the wireless singlechip transmission frequency and the reference signal transmitter 1 that arrange are different, this is to interfere with each other in order to prevent that both from transmitting.Error signal transmitter 2 is placed on needs the highest place of eliminated noise requirement in family room, for example need in bedroom the noise on bed minimum, so just error signal transmitter 2 is placed on bedside cupboard, noise on bed is minimum like this, house person sleeping and be not subject to noise effect outside window in bed, is opening window simultaneously and can naturally circulate by indoor-outdoor air.
Wireless singlechip in the self-adaptive processing main frame 4 of Household active denoiser receives reference signal transmitter 1 and the next signal of error signal transmitter 2 transmitting, the digital signal receiving is constantly sent to FPGA high-performance digital signal processor (FPGA in a steady stream, Field-Programmable Gate Array, be field programmable gate array), in FPGA, adopt Normalized LMS Algorithm to carry out self-adaptive digital signal and process computing, be sent to TLV320AIC23 according to reference signal and error signal generation output digit signals, D/A converter in chip will produce corresponding simulating signal, this simulating signal is sent to the panel speaker 3 with power amplifier 5, panel speaker 3 is as secondary plane sound source sounding, thereby with cancel out each other and room noise reduced from the external noise of window.The dominant frequency of FPGA is 100MHz, thereby ensures that self-adaptive digital signal processing has enough speed of convergence, thereby along with the variation of outside noise can fast automatic adjustment parameter produce corresponding secondary sound source.The circuit of self-adaptive processing main frame 4 is arranged on the back side of panel speaker 3, does as a whole panel speaker 3 to be hung near on the wall of window, and radiating surface is towards indoor.Panel speaker 3 and self-adaptive processing main frame 4 circuit are powered by AC/DC, and AC/DC is provided by the commercial power socket on wall.Because the LF-response insufficient sensitivity of panel speaker 3 is high, therefore this panel speaker 3 is also provided with a bass sound equipment, and this bass sound equipment is electrically connected with panel speaker 3 by frequency divider.
High performance digital signal Processing Algorithm in FPGA high-performance digital signal processor is quick for the various noises in window outside, the convergence of overstable ground self-adaptation, and the noise especially producing for vehicles such as the automobile, subway and the aircrafts that move outside window can be offset fast and efficiently.Adopt the mode of radio communication, can 50 meters of interior stable, with high fidelity communications of distance in family room, overcome the inconvenience that wire communication brings.
As long as install correctly, the utility model Household active denoiser can be by reducing noise 20～30dB in family room in the situation that opening a window, thereby creates the home environment of peace and quiet, environmental protection.
More than adopt the mode of radio communication, can be in family room 50 meters of interior stable, with high fidelity communications of distance, overcome the inconvenience that wire communication brings.
Communicating by letter between reference signal transmitter 1 of the present utility model, error signal transmitter 2 and self-adaptive processing main frame 4 also can adopt wire communication; but this communication mode is because wiring problem can be brought certain inconvenience; can affect daily routines, also make aesthetics give a discount simultaneously.Although wire communication mode is more convenient, more attractive in appearance not as communication, it still has good noise reduction, and cost is also low, is equally applicable to vast family and uses.
It should be noted last that, above embodiment is only unrestricted in order to the technical solution of the utility model to be described.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is modified or is equal to replacement, do not depart from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (7)
1. a Household active denoiser, is characterized in that:
This Household active denoiser comprises
Be used for the reference signal transmitter (1) that receives elementary sound source and export reference signal;
For receiving the error signal transmitter (2) of near the sound-source signal of noise reduction point output error signal;
For reference signal and error signal being processed and are produced the self-adaptive processing main frame (4) of output signal;
Be used for being received from and adapt to the output signal that processing host (4) sends the panel speaker (3) that sends the secondary sound source that can disappear mutually with elementary sound source, the output signal of described self-adaptive processing main frame (4) is delivered to panel speaker (3) after power amplifier (5), and described panel speaker (3) is connected with bass sound equipment.
2. Household active denoiser according to claim 1, is characterized in that:
In described reference signal transmitter (1), self-adaptive processing main frame (4) and error signal transmitter (2), be equipped with the wireless module for radio communication.
3. Household active denoiser according to claim 2, is characterized in that:
In described reference signal transmitter (1), be also provided with the stereo audio codec for the treatment of elementary sound source, and this stereo audio codec is electrically connected with the wireless module being arranged in reference signal transmitter (1), and described reference signal transmitter (1) is by rechargeable battery powered.
4. Household active denoiser according to claim 2, is characterized in that:
In described self-adaptive processing main frame (4), be also provided with stereo audio codec and digital signal processor, be electrically connected successively with the wireless module being arranged in self-adaptive processing main frame (4), described main frame (4) is powered by AC/DC modular power source.
5. Household active denoiser according to claim 2, is characterized in that:
In described error signal transmitter (2), be also provided with stereo audio codec, this stereo audio codec is electrically connected with the wireless module being arranged in error signal transmitter (2), and this error signal transmitter (2) is by rechargeable battery powered.
6. according to the Household active denoiser described in claim 3,4 or 5, it is characterized in that:
Described stereo audio codec adopts TLV320AIC23 chip or SPCE061A single-chip microcomputer.
7. Household active denoiser according to claim 4, is characterized in that:
Described digital signal processor adopts FPGA, TMS6455 or TS201.
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| CN201420060421.9U CN203721181U (en) | 2014-02-10 | 2014-02-10 | Household active noise reduction device |
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| CN201420060421.9U CN203721181U (en) | 2014-02-10 | 2014-02-10 | Household active noise reduction device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835487A (en) * | 2014-02-10 | 2015-08-12 | 杭州歌丽瑞环保科技有限公司 | Household active noise reduction system and noise reduction control method thereof |
| CN106027348A (en) * | 2016-07-28 | 2016-10-12 | 中国船舶重工集团公司第七〇九研究所 | Multi-channel active control system in combination with smart home |
| CN106210987A (en) * | 2016-07-29 | 2016-12-07 | 努比亚技术有限公司 | A kind of mobile terminal, noise reducing apparatus and noise-reduction method thereof |
| CN106292138A (en) * | 2015-05-20 | 2017-01-04 | 江苏宜清光电科技有限公司 | A kind of system using active noise to reduce scialyscope noise |
-
2014
- 2014-02-10 CN CN201420060421.9U patent/CN203721181U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104835487A (en) * | 2014-02-10 | 2015-08-12 | 杭州歌丽瑞环保科技有限公司 | Household active noise reduction system and noise reduction control method thereof |
| CN106292138A (en) * | 2015-05-20 | 2017-01-04 | 江苏宜清光电科技有限公司 | A kind of system using active noise to reduce scialyscope noise |
| CN106027348A (en) * | 2016-07-28 | 2016-10-12 | 中国船舶重工集团公司第七〇九研究所 | Multi-channel active control system in combination with smart home |
| CN106210987A (en) * | 2016-07-29 | 2016-12-07 | 努比亚技术有限公司 | A kind of mobile terminal, noise reducing apparatus and noise-reduction method thereof |
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