CN204006502U - Control device for noise reduction of air conditioner - Google Patents
Control device for noise reduction of air conditioner Download PDFInfo
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- CN204006502U CN204006502U CN201420382069.0U CN201420382069U CN204006502U CN 204006502 U CN204006502 U CN 204006502U CN 201420382069 U CN201420382069 U CN 201420382069U CN 204006502 U CN204006502 U CN 204006502U
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Abstract
The utility model discloses a controlling means for making an uproar falls in air conditioner. Wherein, this a controlling means for air conditioner falls makes an uproar includes the controller, and this controller includes: an acquisition means for acquiring a digital reference signal of a primary sound source in an air conditioner; the generating component is connected with the acquiring component and is used for generating a control command for controlling a secondary sound source in the air conditioner to generate a noise reduction output signal according to the digital reference signal; and a control component connected with the generating component and used for controlling the secondary sound source to generate the noise reduction output signal through the control command. Through the utility model discloses, when having solved falling of centering among the correlation technique, low frequency band noise and having fallen the time of making an uproar, can increase the problem of the structure size of falling the device of making an uproar passively.
Description
Technical field
The utility model relates to air-conditioner field, in particular to a kind of control device for air-conditioner noise reduction.
Background technology
At present, in correlation technique, for air-conditioner is carried out to noise control, provide following several active noise reduction schemes:
Scheme one, tumbler is carried out to active noise controlling, this scheme is utilized pre-stored rotating speed and the corresponding relation of transfer function, determines the sound wave of secondary sound source, and suppress noise by the sound wave of controlling secondary sound source by the operation transfer function corresponding with rotating speed and reference signal.There is following shortcoming in this scheme: 1) must first have the database of transfer function and rotating speed, and in fact transfer function and rotating speed itself does not generally exist positive connection; 2) can only be applied in one dimension pipeline, there is limitation in accommodation.
Scheme two, compressor is carried out to active noise controlling, this scheme need to arrange a cavity at compressor periphery, amplitude and the phase place of the sound wave by real-time control secondary sound source suppress noise, there is following shortcoming in this scheme: 1) need to carry out by analog signal or in frequency domain active noise reduction, and analog signal noise reduction mode does not have too many engineering using value; 2) in active noise reduction, use be the transfer function between reference signal and secondary sound source.3) can only carry out noise reduction to compressor.
In correlation technique, for air-conditioner is carried out to noise control, also provide passive noise reduction scheme.And passive noise reduction scheme is obvious to the noise reduction of high band noise, the noise reduction of centering, low frequency range noise is not obvious, and while adopting passive noise reduction centering, low-frequency noise to carry out noise reduction, can increase the physical dimension of passive denoising device.
During for the noise reduction of centering, low frequency range noise in correlation technique, can increase the problem of the physical dimension of passive denoising device, not yet propose at present effective solution.
Utility model content
Main purpose of the present utility model is to provide a kind of control device for air-conditioner noise reduction, to solve the unconspicuous problem of noise reduction of centering in correlation technique, low frequency range noise.
To achieve these goals, according to the utility model, provide a kind of control device for air-conditioner noise reduction.This device comprises: comprise controller, controller comprises: obtain parts, for obtaining the digital reference signal of elementary sound source of air-conditioner; Generate parts, and obtain parts and be connected, produce the control command of noise reduction output signal for generate secondary sound source for controlling air-conditioner according to digital reference signal; And control assembly, be connected with generation parts, for producing noise reduction output signal by control command control secondary sound source.
Further, this control device also comprises: error detector, for obtaining error signal; And controller also comprises: correcting part, be connected with generation parts with error detector, and for according to error signal correction noise reduction output signal, obtain revised noise reduction output signal.
Further, this control device also comprises: digital signal processor, and obtains parts and is connected with error detector, for respectively digital reference signal and error signal being carried out to corresponding Digital Signal Processing.
Further, digital signal processor comprises: audio coding decoding chip, be connected with error detector, and for error signal is carried out to audio decoder, obtain audio decoder signal; And DSP chip, with audio coding decoding chip with obtain parts and be connected, for audio decoder signal is carried out to digital processing, and digital reference signal is carried out to filtering processing.
Further, DSP chip comprises: wave filter, and obtains parts and is connected, for digital reference signal is carried out to filtering processing.
Further, digital signal processor also comprises: power amplifier, is connected with audio coding decoding chip, for the output signal of audio coding decoding chip is amplified to processing.
Further, this control device also comprises: reference-signal detector, for detection of the analog of elementary sound source; And A/D converter, be connected with reference-signal detector, for analog is converted to digital reference signal.
Further, reference information detector is reference signal sensor, and reference signal sensor comprises: speed probe and/or acceleration transducer.
Further, speed probe comprises: the first speed probe, is arranged on the flabellum of blower fan of air-conditioner, for obtaining the digital tach signal of blower fan; And/or second speed probe, be arranged on the air outlet of indoor set of air-conditioner, for the digital tach signal of indoor set.
Further, acceleration transducer comprises: the first acceleration transducer, is arranged on the compressor of air-conditioner, for obtaining the digital acceleration signal of compressor; And/or second acceleration transducer, be arranged on the indoor set of air-conditioner, for the digital acceleration signal of indoor set.
By the utility model, adopt controller of air conditioner to comprise: to obtain parts, for obtaining the digital reference signal of elementary sound source of air-conditioner; Generate parts, and obtain parts and be connected, produce the control command of noise reduction output signal for generate secondary sound source for controlling air-conditioner according to digital reference signal; And control assembly, be connected with generation parts, for producing noise reduction output signal by control command control secondary sound source, solve the unconspicuous problem of noise reduction of centering, low frequency range noise in correlation technique, and then reached the obvious effect of noise reduction of centering, low frequency range noise.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is according to the schematic diagram of the control device for air-conditioner noise reduction of the utility model embodiment;
Fig. 2 is according to the signal flow diagram of the active noise reduction system of the utility model embodiment;
Fig. 3 is according to the schematic diagram of the active noise reduction of the utility model embodiment;
Fig. 4 is according to the schematic diagram of the digital signal processor of the utility model embodiment;
Fig. 5 is according to the schematic diagram of the blower fan noise reduction system of the utility model embodiment;
Fig. 6 is according to the schematic diagram of the compressor noise-reduction system of the utility model embodiment; And
Fig. 7 is according to the schematic diagram of the indoor set noise reduction system of the utility model embodiment.
Detailed description of the invention
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
In order to make those skilled in the art better understand the utility model scheme, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiment.Based on the embodiment in the utility model, do not make the every other embodiment obtaining under creative work prerequisite those of ordinary skill in the art, all should belong to protection domain of the present utility model.
It should be noted that, term " first ", " second " etc. in description of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and needn't be used for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiment of the present utility model described herein can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, is intended to be to cover not exclusive comprising.
According to embodiment of the present utility model, a kind of control device for air-conditioner noise reduction is provided, this control device that is used for air-conditioner noise reduction is for carrying out active noise reduction to air-conditioner.
Fig. 1 is according to the schematic diagram of the control device for air-conditioner noise reduction of the utility model embodiment.
As shown in Figure 1, this control device comprises: obtain parts 10, generate parts 20 and control assembly 30.
Obtaining parts 10 can be for obtaining the digital reference signal of the elementary sound source in air-conditioner.
Before obtaining the digital reference signal of the elementary sound source in air-conditioner, can first obtain the analog of the elementary sound source in air-conditioner, then by analog signal discretization, the digital reference signal that just can be answered in contrast.Particularly, can process analog by signal processor, obtain digital reference signal.
It should be noted that, what construct noise produced is basic because be to have structural vibration, and therefore, in air-conditioner, any parts that can produce structural vibration can be served as elementary sound source.So-called elementary sound source is noise source.
For example, noise source can comprise off-premises station and indoor set, and off-premises station noise source can comprise blower fan and compressor etc.Wherein, because construct noise is relevant to structural vibration, the rotational noise of blower fan is relevant to the rotating speed of blower fan, therefore, in the utility model embodiment, reference signal (comprising digital reference signal and analog) can be structure vibration signals and tach signal etc.For example, reference signal can be the acceleration signal of tach signal, the acceleration signal of compressor and the tach signal of indoor set or the indoor set of blower fan etc.It should be noted that, why tach signal and acceleration signal can be used as reference signal is the frequency characteristic that can determine noise because of them.
Particularly, can obtain by detector (as sensor) analog of the elementary sound source in air-conditioner, wherein, detector can be reference signal sensor.For example, in the time that elementary sound source is blower fan, can obtain rotation speed of fan signal by speed probe; In the time that elementary sound source is compressor, can obtain by acceleration transducer the acceleration signal of compressor; In the time that elementary sound source is indoor set, can obtains by speed probe the tach signal of indoor set, or can obtain by acceleration transducer the acceleration signal of indoor set.Aforesaid every speed signal and acceleration signal are all reference signals.It should be noted that, in the utility model embodiment, the analog of the elementary sound source in can Real-time Obtaining air-conditioner, and according to predeterminated frequency, analog is sampled, obtain corresponding digital reference signal.
Particularly, in air-conditioner, corresponding detector (as sensor) can be set, at this moment, can obtain by other means the analog of elementary sound source, for example, can obtain the reference signal such as rotating speed and acceleration by the control device of air-conditioner self.
Generate parts 20 and obtain parts 10 and be connected, for generate the control command of the secondary sound source generation noise reduction output signal for controlling air-conditioner according to digital reference signal.
Wherein, control command produces noise reduction output signal for the secondary sound source of controlling air-conditioner, and noise reduction output signal is for suppressing the noise that elementary sound source is sent.
Particularly, the control device in air-conditioner can compute weighted according to the length of digital reference signal and predefined weighing vector, obtains the noise reduction output signal of secondary sound source, and produces control command according to noise reduction output signal.In the time that control command is sent to secondary sound source by control device, secondary sound source can move aforesaid noise reduction output signal according to control command.Wherein, the length of weighing vector is identical with the length of digital reference signal.
For example, the length of supposing digital reference signal X (n) and weighing vector W (n) is n, and n=1,2,3 ..., wherein, digital reference signal X (n) is input signal, and the noise reduction output signal of secondary sound source can calculate y (n)=W (n) X by following formula
t(n).
While moving aforesaid noise reduction output signal due to secondary sound source, may produce the vibration of certain frequency, and the vibration of certain frequency can cause secondary sound source to send specific sound wave, wherein, the single spin-echo of the sound wave that the phase place of this specific sound wave and noise source produce, but the size of aforementioned two kinds of sound waves can be identical.Like this, the noise that noise reduction output signal just can be sent for suppressing elementary sound source, reaches the object of controlling air-conditioning noise reduction.It should be noted that, secondary sound source can be arranged on the loudspeaker in air-conditioner etc.
Control assembly 30 is connected with generation parts 20, for producing noise reduction output signal by control command control secondary sound source.
By the utility model embodiment, owing to adopting digital reference signal, therefore wide accommodation, applicable scene is many, and because secondary sound source can be according to control command, move rotating speed and/or the acceleration corresponding with control command, thereby cause object vibration, produce specific sound wave or specific sound field, wherein, this specific sound wave or this specific sound field can suppress noise source (being sound wave or the sound field that elementary sound source produces), therefore, have reached the effect of obvious air-conditioner active noise reduction.
In the utility model embodiment, active noise reduction technology can in the indoor set to air-conditioner and off-premises station, low-frequency noise carries out noise reduction, and indoor set to air-conditioner and the high-frequency noise of off-premises station carry out noise reduction.Preferably, active noise reduction technology can in the indoor set to air-conditioner and off-premises station, low-frequency noise carries out noise reduction, and noise reduction is obvious, for example, can make the reducing noise 6-10 decibel of air-conditioner.
Preferably, in the utility model embodiment, this control device can also comprise: error detector.Error detector can be for obtaining error signal.Wherein, aforesaid controller can also comprise: correcting part.This correcting part can be connected with generation parts with error detector, and for according to error signal correction noise reduction output signal, obtains revised noise reduction output signal.
It should be noted that, in the utility model embodiment, can step-up error detector, also step-up error detector not, wherein, error detector can be error pick-up.
Wherein, in the utility model embodiment, after producing noise reduction output signal by control command control secondary sound source, in the time being provided with error pick-up, can obtain error signal by pass-through mode one, in the time that error pick-up is set not, can obtain error signal by pass-through mode two:
Mode one, by the mode of error pick-up direct-detection, the error signal that this kind of mode obtained can comprise two parts: the desired signal part of error pick-up itself,, error pick-up detects the acoustical signal part of elementary sound source, and the acoustical signal part of the sound field of the secondary sound source that detects of error pick-up.Wherein, adopt in this way, can simple and fast obtain error signal, and save a large amount of computational process, cost saves time.
Mode two, by first detecting transfer function, then calculated in the noise reduction output signal in a upper moment according to the transfer function and the primary and secondary sound source that detect, obtained the size of error signal, that is, and and the mode of indirect detection.Wherein, adopt in this way, save error pick-up, the structure of simplification device, and save hardware cost.
Particularly, the error signal that error detector can be obtained feeds back to controller of air conditioner, and in controller according to the mapping relations of predefined error signal and weighing vector, first revise each in weighing vector, revise the noise reduction output signal of corresponding with it secondary sound source according to each in the weighing vector of having revised again, thereby obtain revised noise reduction output signal.
Preferably, any one in weighing vector can be the iteration function of the filtering signal of its last item and error signal and convergence factor and reference signal (can be the input signal of control device at this).
By the utility model embodiment, owing to only adopting the noise reduction output signal being determined by control command, can not farthest suppress the noise that elementary sound source (being noise source) produces, therefore, adopt error signal to revise noise reduction output signal by correction, and secondary sound source moves this correction noise reduction output signal, can suppress greatly the noise that elementary sound source (being noise source) produces, reach the more obvious object of air-conditioner noise reduction.
Particularly, in the utility model embodiment, can obtain in the following manner error signal: controller of air conditioner can be for obtaining the current noise reduction output signal of secondary sound source.Particularly, the current noise reduction output signal of secondary sound source can be determined according to the control command corresponding with current noise reduction output signal, or the current noise reduction output signal of secondary sound source can also be immediately detected by sensor.Controller of air conditioner can also be used for obtaining the transfer function of current noise reduction output signal and error signal.Particularly, can from store list, obtain predefined transfer function, wherein, store list is database table, or can first detect noise reduction output signal and input signal, then calculate to obtain transfer function according to noise reduction output signal and input signal, wherein, noise reduction output signal herein can be the noise reduction output signal of secondary sound source, the reference signal that input signal can elementary sound source.Controller of air conditioner can also be used for calculating according to current noise reduction output signal and transfer function, obtains the acoustical signal of the sound field of secondary sound source.Particularly, can be by current noise reduction output signal and transfer function to be carried out to convolution algorithm, convolution results is the acoustical signal of the sound field of secondary sound source.Controller of air conditioner can also be used for using acoustical signal as error signal.
Like this, correcting part can adopt aforementioned error signal to revise aforesaid weighing vector, obtains revised weighing vector, and then utilizes revised weighing vector to revise the noise reduction output signal of secondary sound source.It should be noted that, the mode of obtaining error signal described in mode one is the mode of aforesaid indirect detection.
Or, preferably, in the utility model embodiment, can also obtain in the following manner error signal:
Controller of air conditioner can be for obtaining the desired signal of error pick-up self.Error pick-up can obtain the desired signal of self by the mode that detects self.
Error pick-up can be delivered to for detection of secondary sound source the noise reduction output signal of error pick-up.Wherein, secondary sound source is delivered to the function of the transfer function between noise reduction output signal and secondary sound source and the error pick-up that the noise reduction output signal of error pick-up can be secondary sound source.For example, secondary sound source is delivered to the transfer function convolution between noise reduction output signal and secondary sound source and the error pick-up that the noise reduction output signal of error pick-up can be secondary sound source.Particularly, can go out secondary sound source and be delivered to by error pick-up direct-detection the noise reduction output signal of error pick-up.
Controller of air conditioner can, for calculating according to desired signal and the noise reduction output signal that is delivered to error pick-up, obtain error signal.Wherein, the error signal here can be the stack of desired signal and the noise reduction output signal that is delivered to error pick-up.
For example, at loudspeaker, during as secondary sound source, loudspeaker can be arranged on the indoor set and off-premises station of air-conditioner, as it can be arranged on the blower fan and compressor of off-premises station, the operation principle of the noise reduction output signal noise reduction of the loudspeaker of wherein, having revised can realize according to following formula:
The noise reduction output signal of loudspeaker: y (n)=W (n) X
t(n) (1)
Weighing vector: W (n+1)=W (n)-2ue (n) r (n) (2)
Error signal: e (n)=d (n)+s (n) (3)
Secondary sound source is delivered to the noise reduction output signal of error pick-up: s (n)=y (n) * h
s(n) (4)
Filtering signal: r (n)=X (n) * h
s(n) (5)
Wherein, the noise reduction output signal y (n) of loudspeaker has determined the size of the acoustic pressure that loudspeaker send.The noise reduction output signal y (n) of loudspeaker is superposeed and is obtained by reference signal (as tach signal, the acceleration signal etc.) X (n) of weighing vector W (n) and reference signal sensor detection (as speed probe, acceleration transducer etc.), the length of X (n) and W (n) can be L, L is natural number, W (n) can be designated as [w1 (n), w2 (n), wL (n)], X (n) is designated as [x (n), x (n-1) ... x (n-L+1)].Weighing vector W (n) can preset, or it can obtain according to error signal correction on default vectorial basis.Weighing vector W (n+1) can obtain by weighing vector coefficient W (n), filtering signal r (n), convergence coefficient or convergence factor u and error signal e (n) correction of last.Filtering signal r (n) can be obtained by Filtered-X LMS algorithm by reference signal, compared with existing correlation technique, Filtered-X LMS algorithm has been considered the impact of secondary sound source to the transfer function between error pick-up, thereby makes the noise reduction of air-conditioner more obvious.Error signal e (n) is desired signal d (n), and secondary sound source is delivered to the stack of the noise reduction output signal s (n) of error pick-up.As shown in Figure 2, the principle of its active noise reduction as shown in Figure 3 for the expression of above-mentioned each signal and transfer function.Wherein, in Fig. 3,1 is noise source (elementary sound source), and 2 is reference signal sensor (speed probe or acceleration transducer), and 3 is controller, and 4 is loudspeaker (elementary sound sources), and 5 is error pick-up.
Preferably, in the utility model embodiment, this control device can also comprise: digital signal processor.This digital signal processor can with obtain parts and be connected with error detector, and for respectively digital reference signal and error signal being carried out to corresponding Digital Signal Processing.
Preferably, in the utility model embodiment, this digital signal processor can comprise: audio coding decoding chip and digital signal processor DSP chip.Wherein, audio coding decoding chip can be connected with error detector, and for error signal is carried out to audio decoder, obtains audio decoder signal.Dsp chip can with audio coding decoding chip with obtain parts and be connected, and for audio decoder signal is carried out to digital processing, and digital reference signal is carried out to filtering processing.
Preferably, in the utility model embodiment, this dsp chip can comprise: wave filter.This wave filter can with obtain parts and be connected, and for digital reference signal is carried out to filtering processing.
Particularly, in error signal, obtain the filtering signal of digital reference signal by wave filter.Wherein, filtering signal is the convolution signal of digital reference signal and transfer function.For example, wave filter can obtain filtering signal by Filtered-X LMS algorithm.
In addition, controller of air conditioner can also obtain first weighing vector of digital reference signal in the first moment, and determine the second weighing vector according to error signal, filtering signal and the first weighing vector, the second weighing vector is digital reference signal at the weighing vector in the second moment, and the second moment was the moment after the first moment.Wherein, the second weighing vector can calculate by aforesaid weighing vector formula (2): W (n+1)=W (n)-2ue (n) r (n), W (n) represents the first weighing vector.
Like this, correcting part can also be used for, according to the second weighing vector correction noise reduction output signal, obtaining revised noise reduction output signal.Control assembly 30 can also produce revised noise reduction output signal by control command control secondary sound source.Concrete makeover process, as previous embodiment, does not repeat them here.Revise noise reduction output signal by revising weighing vector, method is simple, and can suppress greatly the noise that elementary sound source (being noise source) produces, and reaches the more obvious object of air-conditioner noise reduction.
Preferably, in the utility model embodiment, this digital signal processor can also comprise: power amplifier.This power amplifier can be connected with audio coding decoding chip, and for the output signal of audio coding decoding chip is amplified to processing.
Preferably, in the utility model embodiment, this control device can also comprise: reference-signal detector and A/D converter (being A/D converter).Wherein, reference-signal detector can be for detection of the analog of elementary sound source.A/D converter (A/D converter) can be connected with reference-signal detector, and for analog is converted to digital reference signal.
Particularly, can carry out by being arranged on reference signal sensor in air-conditioner the analog of detection of primary sound source, for example, detect the rotating speed of blower fan and/or the rotating speed of indoor set by speed probe, and detect acceleration of compressor or indoor set etc. by acceleration transducer.
After above-mentioned arbitrary analog being detected, can in the signal processor being arranged in air-conditioner, analog be converted to digital reference signal.
Wherein, the signal processor that digital signal processor is active noise reduction, as shown in Figure 4, digital signal processor can comprise audio coding decoding chip 6, dsp chip and power amplifier 7.5 is error pick-up, it by Real-time Collection to the processing of decoding of noise signal transmission to audio coding decoding chip, obtain decoded signal, this decoded signal transforms through the McASP port of audio coding decoding chip and through A/D, obtain data signal, this digital data transmission is to DSP, and in DSP, utilize Filtered-X LMS algorithm to carry out filtering processing, obtain filtering signal, this filtering signal amplifies processing by AUDIO OUT port transmission to the power amplifier of audio coding decoding chip again, and exports this amplifying signal.
Preferably, in the utility model embodiment, reference information detector can be reference signal sensor, and reference signal sensor can comprise: speed probe and/or acceleration transducer.
Preferably, in the utility model embodiment, this speed probe can comprise: the first speed probe and/or the second speed probe.Wherein, the first speed probe, is arranged on the flabellum of blower fan of air-conditioner, and for obtaining the digital tach signal of blower fan.And/or second speed probe, be arranged on the air outlet of indoor set of air-conditioner, and for the digital tach signal of indoor set.
Preferably, in the utility model embodiment, this acceleration transducer can comprise: the first acceleration transducer and/or the second acceleration transducer.Wherein, the first acceleration transducer, is arranged on the compressor of air-conditioner, and for obtaining the digital acceleration signal of compressor.And/or second acceleration transducer, be arranged on the indoor set of air-conditioner, and for the digital acceleration signal of indoor set.
For example, as shown in Figure 5, in blower fan noise reduction system, A1 is speed probe, and it can be arranged on the flabellum of blower fan fan, and A1 can be for detection of the rotating speed of fan, and wherein, the rotating speed of fan has determined the frequency characteristic of blower fan rotational noise; B1 is error pick-up, and it can be arranged on the impeller of blower fan fan, the size of the sound field after sound that B1 can send for detection of fan noise and loudspeaker is superimposed; C1 is loudspeaker, and it can be for sounding, and the noise sending to offset blower fan reaches the object of noise reduction.Wherein, the signal of A1, B1 and C1 is processed in DSP.
For example, as shown in Figure 6, in compressor noise-reduction system, A2 is acceleration transducer, it can be arranged in the primary importance of compressor, and A2 can be for detection of the acceleration of compressor, wherein, the acceleration of compressor has determined the frequency characteristic of vibration of compressor noise, it should be noted that, the noise of structure radiation is except being caused by vibration of compressor, and the miscellaneous part vibration that can also be caused by compressor causes, wherein, compressor is noise source (elementary sound source); B2 is error pick-up, and it can be arranged in the second place of compressor, the size of the sound field after sound that B2 can send for detection of compressor noise and loudspeaker is superimposed; C2 is loudspeaker, and it can be for sounding, and the noise sending to offset compressor reaches the object of noise reduction.Wherein, the signal of A2, B2 and C2 is processed in DSP.
For example, as shown in Figure 7, in indoor set noise reduction system, A3 is acceleration transducer or speed probe, it can be arranged on the air outlet of indoor set, A3 can be for detection of the acceleration of indoor set or rotating speed, and wherein, the acceleration of indoor set or rotating speed have determined the frequency characteristic of indoor set vibration noise; B3 is error pick-up, the size of the sound field after sound that B2 can send for detection of noise of indoor unit and loudspeaker is superimposed; C3 is loudspeaker, and it can be for sounding, and the noise sending to offset indoor set reaches the object of noise reduction.By using A3, can save a microphone, reduce manufacturing cost.Wherein, the signal of A3, B3 and C3 is processed in DSP.
Wherein, if air-conditioner controller itself can obtain tach signal or acceleration signal, can from Fig. 5 to Fig. 7, A1, A2 and A3 be deleted respectively, that is, A1, A2 and A3 are not set.
Pass through foregoing description, in the utility model embodiment, adopt force signal (as tach signal and acceleration signal) as with reference to signal, simplify embodiment, and can build the active noise reduction system of error free sensor, simplify the structure of active noise reduction system.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. for a control device for air-conditioner noise reduction, it is characterized in that, comprise controller, described controller comprises:
Obtain parts, for obtaining the digital reference signal of elementary sound source of air-conditioner;
Generate parts, be connected with the described parts that obtain, for generate the control command of the secondary sound source generation noise reduction output signal for controlling described air-conditioner according to described digital reference signal; And
Control assembly, is connected with described generation parts, for producing described noise reduction output signal by secondary sound source described in described control command control.
2. control device according to claim 1, is characterized in that, also comprises:
Error detector, for obtaining error signal; And
Described controller also comprises: correcting part, be connected with described generation parts with described error detector, and for according to noise reduction output signal described in described error signal correction, obtain revised noise reduction output signal.
3. control device according to claim 2, it is characterized in that, also comprise: digital signal processor, is connected with described error detector with the described parts that obtain, for respectively described digital reference signal and described error signal being carried out to corresponding Digital Signal Processing.
4. control device according to claim 3, is characterized in that, described digital signal processor comprises:
Audio coding decoding chip, is connected with described error detector, for described error signal is carried out to audio decoder, obtains audio decoder signal; And
DSP chip, with described audio coding decoding chip with described in obtain parts and be connected, for described audio decoder signal is carried out to digital processing, and described digital reference signal is carried out to filtering processing.
5. control device according to claim 4, is characterized in that, described DSP chip comprises: wave filter, is connected with the described parts that obtain, for described digital reference signal is carried out to filtering processing.
6. control device according to claim 4, is characterized in that, described digital signal processor also comprises: power amplifier, is connected with described audio coding decoding chip, for the output signal of described audio coding decoding chip is amplified to processing.
7. control device according to claim 1, is characterized in that, also comprises:
Reference-signal detector, for detection of the analog of described elementary sound source; And
A/D converter, is connected with described reference-signal detector, for described analog is converted to described digital reference signal.
8. control device according to claim 7, is characterized in that, reference information detector is reference signal sensor, and described reference signal sensor comprises: speed probe and/or acceleration transducer.
9. control device according to claim 8, is characterized in that, described speed probe comprises:
The first speed probe, is arranged on the flabellum of blower fan of described air-conditioner, for obtaining the digital tach signal of described blower fan; And/or
The second speed probe, is arranged on the air outlet of indoor set of described air-conditioner, for the digital tach signal of described indoor set.
10. control device according to claim 8, is characterized in that, described acceleration transducer comprises:
The first acceleration transducer, is arranged on the compressor of described air-conditioner, for obtaining the digital acceleration signal of described compressor; And/or
The second acceleration transducer, is arranged on the indoor set of described air-conditioner, for the digital acceleration signal of described indoor set.
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| CN104864562A (en) * | 2015-05-06 | 2015-08-26 | 海信（广东）空调有限公司 | Noise control method and device, household appliance and central controller |
| CN105157204A (en) * | 2015-10-19 | 2015-12-16 | 珠海格力电器股份有限公司 | Noise reduction method and system, electronic expansion valve and air conditioner |
| CN105241013A (en) * | 2015-10-23 | 2016-01-13 | 青岛海尔空调器有限总公司 | Control method and device for air conditioner and air conditioner |
| CN105299828A (en) * | 2015-10-13 | 2016-02-03 | 珠海格力电器股份有限公司 | Noise processing method and system and air conditioner |
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| CN109282479B (en) * | 2018-09-17 | 2021-02-23 | 青岛海信日立空调系统有限公司 | Air conditioner noise reduction device and noise reduction method |
| CN110822695A (en) * | 2019-11-27 | 2020-02-21 | 广东美的制冷设备有限公司 | Noise reduction method and device for air conditioner, air conditioner and electronic equipment |
| CN111189107A (en) * | 2020-03-03 | 2020-05-22 | 青岛海尔空调器有限总公司 | Active noise reduction air conditioner and control method thereof |
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