CN111938504A - Space active noise reduction method, device and system and dust collector - Google Patents
Space active noise reduction method, device and system and dust collector Download PDFInfo
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- CN111938504A CN111938504A CN202010906136.4A CN202010906136A CN111938504A CN 111938504 A CN111938504 A CN 111938504A CN 202010906136 A CN202010906136 A CN 202010906136A CN 111938504 A CN111938504 A CN 111938504A
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
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Abstract
The application discloses a space active noise reduction method, a device, a system and a dust collector, wherein the method comprises the following steps: acquiring a first signal reflecting the working condition of equipment to be denoised; determining noise reduction parameters from the first signal; and adjusting a second signal for driving to emit noise reduction sound waves according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the equipment to be subjected to noise reduction. The embodiment of the application can solve the bottleneck of the noise reduction technology of the current dust collector, and well reduces medium-high frequency noise under the condition that the inner space is not occupied and the pasting volume of the sound absorption material is limited.
Description
Technical Field
The invention relates to the field of active noise reduction, in particular to a space active noise reduction technology.
Background
The existing dust collector has overlarge noise. Excessive noise can affect user hearing comfort and is a common and central problem in improving the performance of vacuum cleaners.
The main sources of noise in vacuum cleaners include: noise generated when gas flows at a high speed, noise generated when a motor rotates at a high speed, and the like. The noise of the cleaner is mainly concentrated in the middle and high frequency range.
For the handheld wireless dust collector, because the product weight, the cleaning capacity, the noise and the endurance time need to be comprehensively considered, the noise reduction means adopted by the handheld wireless dust collector needs to further avoid influencing other performances of the dust collector.
The current means for reducing body noise mainly include: the structure of the machine body is changed, or a dust collector motor with advanced technology is adopted, or a passive noise reduction structure is added. Improving the machine body structure or the motor inevitably leads to increased design and production costs. The mode of making an uproar falls passively in the adoption, pastes sound absorbing material in the organism promptly, because organism inner space is limited, and the volume of the sound absorbing material who pastes is also very limited, and sound absorption effect and sound absorbing material's volume positive correlation again, so adopt the mode of making an uproar fall passively effect limited. In addition, too much sound-absorbing material can cause airflow obstruction of the dust collector, and the cleaning force of the dust collector is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a space active noise reduction method and a dust collector. The invention specifically adopts the following technical scheme.
In a first aspect, a method for spatially active noise reduction is provided, including: acquiring a first signal reflecting the working condition of equipment to be denoised; determining noise reduction parameters from the first signal; and adjusting a second signal for driving to emit noise reduction sound waves according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the equipment to be subjected to noise reduction.
With reference to the first aspect of the present application, in one possible implementation manner, the determining a noise reduction parameter according to the first signal includes: determining a calculation coefficient characterizing the sound field structure from the first signal; and determining the noise reduction parameters according to the calculation coefficients.
With reference to the first aspect of the present application, in one possible implementation manner, the method further includes: and when the energy of the noise signal after the noise reduction of the sound field exceeds a set threshold value, updating the noise reduction parameter, and adjusting the second signal according to the updated noise reduction parameter.
With reference to the first aspect of the present application, in a possible implementation manner, the second signal for driving to emit noise reduction sound waves is adjusted by an active noise reduction system according to the noise reduction parameters; wherein the active noise reduction system comprises at least one input and at least one output; in the active noise reduction process, adjusting the driving signal at the output end according to the noise reduction parameters, so that the driving signal drives the output end to generate noise reduction sound waves; the number of channels of the active noise reduction system is more than or equal to 1, and the order j of each noise reduction channel is more than or equal to 1.
With reference to the first aspect of the present application, in a possible implementation manner, the updating the noise reduction parameter includes: adjusting the noise reduction parameters to minimize the total energy of the sound field after the sound field is subjected to noise reduction; and updating the noise reduction parameters to the adjusted values.
With reference to the first aspect of the present application, in a possible implementation manner, the updating the noise reduction parameter includes: according to total energy of sound field
Adjusting the noise reduction parameters to enable the total energy En of the corresponding sound field to be minimum; and updating the noise reduction parameters.
With reference to the first aspect of the present application, in one possible implementation manner, noise after noise reduction
A set of noise collected for an error input in the active noise reduction system; wherein, the noise collected by the I-th error input end of the active noise reduction system
Wherein N isl(n) represents the original noise signal collected by the first reference input end of the active noise reduction system at the time n; w is al，j(n) represents the j-th order noise reduction parameter updated by the I-th noise reduction channel of the active noise reduction system at the time of n.
In a second aspect, a spatially active noise reduction apparatus is provided, comprising: the receiving module is configured to obtain a first signal reflecting the working condition of the equipment to be denoised; a noise reduction parameter determination module configured to determine noise reduction parameters from the first signal; and the adjusting module is configured to adjust a second signal for driving the emission of noise reduction sound waves according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the device to be noise reduced.
With reference to the second aspect of the present application, in one possible implementation manner, the noise reduction parameter determination module is further configured to: determining a calculation coefficient characterizing the sound field structure from the first signal; and determining the noise reduction parameters according to the calculation coefficients.
With reference to the second aspect of the present application, in one possible implementation manner, the noise reduction parameter determination module is further configured to: when the noise of the sound field after noise reduction exceeds a set threshold value, updating the noise reduction parameters; the adjustment module is further configured to: adjusting the second signal according to the updated noise reduction parameter.
With reference to the second aspect of the present application, in one possible implementation manner, the noise reduction parameter determination module is further configured to: adjusting the noise reduction parameters to minimize the total energy of the sound field after the sound field is subjected to noise reduction; and updating the noise reduction parameters to the adjusted values.
In a third aspect, a spatially active noise reduction system is provided, comprising: the signal acquisition unit is used for acquiring a first signal reflecting the working condition of the equipment to be denoised; and the active noise reduction unit is used for determining noise reduction parameters according to the first signal and adjusting a second signal for driving noise reduction sound waves to be emitted according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the equipment to be noise reduced.
With reference to the third aspect of the present application, in one possible implementation manner, the active noise reduction unit includes: a sound field adaptation subunit for determining, from the first signal, a calculation coefficient characterizing the sound field structure; and the filtering configuration subunit is used for determining the noise reduction parameters according to the calculation coefficients.
With reference to the third aspect of the present application, in one possible implementation manner, the signal acquisition unit includes: the input equipment is arranged in the equipment to be denoised and is used for acquiring noise signals of the sound field; the noise signal comprises noise after noise reduction of the sound field; the active noise reduction unit further includes: the noise reduction detection subunit is used for detecting whether the noise signal energy after the noise reduction of the sound field exceeds a set threshold value; and the filtering adaptation subunit is used for updating the noise reduction parameters when the noise signal energy after the noise reduction of the sound field exceeds the set threshold value.
With reference to the third aspect of the present application, in one possible implementation manner, the at least one input device includes: the two microphones are respectively used for acquiring an original noise signal of the sound field and a noise signal of the sound field after noise reduction; wherein the system further comprises: and the at least two loudspeakers are arranged in the equipment to be denoised and are used for outputting denoising sound waves according to the second signal to actively denoise.
In a fourth aspect, there is provided a vacuum cleaner comprising a storage medium having program instructions embodied therein that are executable by a processor, the program instructions when executed performing the steps of any of the methods described above.
In a fifth aspect, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the steps of the method of any one of the above.
Advantageous effects
The invention designs corresponding noise reduction parameters for active noise reduction aiming at different noises generated by equipment to be subjected to noise reduction under different working conditions. The output end of the active noise reduction system adjusts the driving signal according to the noise reduction parameter corresponding to the current working condition, so that the noise reduction sound wave generated by the driving signal driving loudspeaker achieves a more ideal noise reduction effect.
Furthermore, in the invention, when the current noise reduction parameters are found not to be suitable for the current working condition and the noise reduction effect does not meet the requirement, the noise reduction parameters can be further updated according to the residual noise energy after active noise reduction so as to keep the higher noise reduction effect of the dust collector.
The main structure of the active noise reduction system only comprises the main board, the loudspeaker and the microphone which are arranged in the equipment to be subjected to noise reduction, the occupied internal volume of the equipment to be subjected to noise reduction is small, and the influence on the overall power consumption of the equipment to be subjected to noise reduction is limited. Under the condition of not influencing the overall performance of the dust collector, the invention can achieve a relatively ideal noise reduction effect, effectively inhibit the medium and high frequency band noise of the equipment to be subjected to noise reduction, and improve the use experience of the machine.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the construction of the vacuum cleaner of the present invention;
FIG. 2 is a first block diagram of the spatially active noise reduction system of the present invention;
FIG. 3 is a second block diagram of the spatially active noise reduction system of the present invention;
fig. 4 is a schematic structural diagram of a spatial active noise reduction device according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the application.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in the present invention means that the respective single or both of them exist individually or in combination.
The meaning of the inner and the outer in the invention means that the direction from the shell of the dust collector to the air duct in the dust collector is inner, and vice versa, relative to the dust collector per se; and not as a specific limitation on the mechanism of the device of the present invention.
The term "connected" as used herein may mean either a direct connection between the components or an indirect connection between the components via other components.
The meaning of "front and back" in the invention means that when a user holds the dust collector, the direction from the air inlet of the dust collector to the air outlet is the back, otherwise, the direction is the front, and the invention is not specially limited to the device mechanism.
Fig. 1 is a vacuum cleaner according to the present invention, which includes:
the motor 1 is arranged in the shell of the dust collector and is electrified to rotate to drive air to enter an air duct in the dust collector to realize dust collection;
the microphone 2 is used as an input device of the active noise reduction system, is arranged at an input end of the active noise reduction system inside the housing of the dust collector shown in fig. 2 or fig. 3, and particularly can be arranged in an air duct inside the dust collector to collect noise, such as an original noise signal of the dust collector and a residual noise signal after active noise reduction of the present invention;
and the noise reduction main board 4 is used as a core component of the active noise reduction system and is also arranged in the dust collector. Specifically, the noise reduction main board 4 may be integrated in a control main board of the dust collector itself, or may be separately set up, and is configured to receive a noise signal collected by the microphone through the input end, perform signal processing on the noise signal, and output a driving signal to the output end;
and the loudspeaker 6 is used as output equipment of the active noise reduction system, is arranged at the output end of the active noise reduction system shown in the figure 2 or the figure 3, is driven by the driving signal to emit noise reduction sound waves, and offsets a noise sound field in the dust collector.
The dust collector can be a handheld wireless dust collector, an alternating current dust collector or other energy supply type dust collectors. To the handheld wireless dust catcher commonly used, its shell still is connected with battery 5 for to motor wherein, fall make an uproar mainboard, control circuit structure such as mainboard and supply energy.
Referring to fig. 2, in order to reduce noise generated by the operation of the vacuum cleaner, an active noise reduction system is provided in the vacuum cleaner, and the active noise reduction system includes:
and the signal acquisition unit is used for acquiring signals reflecting the working conditions of the dust collector. It should be understood that the specific content form of the signal reflecting the working condition of the dust collector can be adjusted according to the requirements of practical application scenarios, and the specific content form of the signal reflecting the working condition of the dust collector is not limited in the present application. In an embodiment of the present application, the signal reflecting the operating condition of the vacuum cleaner may include signals collected by sensors (e.g., microphones disposed at different noise sources), and the noise emitted by each noise source (e.g., motor, ventilation opening, etc.) under different operating conditions is different; in another embodiment, the signal reflecting the operating condition of the vacuum cleaner may also comprise a signal reflecting the operating condition of the vacuum cleaner itself, for example a response signal received by the system controlling the gear adjustment when the adjustable vacuum cleaner is shifting gears; in another embodiment, the signal indicative of the condition of the vacuum cleaner may further comprise an electrical signal in different conditions. For example, the current I or the voltage V of the battery unit in the vacuum cleaner, which is different in intensity due to different working conditions, may also be used to characterize the current working conditions of the vacuum cleaner.
In an embodiment of the present application, the active noise reduction unit may include: the sound field adaptation subunit is used for determining a calculation coefficient K representing a sound field structure according to the signal reflecting the working condition of the dust collector; and a filtering configuration subunit, configured to determine the noise reduction parameter W according to the calculation coefficient K. The calculation coefficient K is a parameter of sound field modeling involved in space modeling, and the calculation coefficient K changes only when a space sound field structure inside the dust collector changes. Therefore, the active noise reduction unit can determine a parameter W of the active noise reduction unit according to the calculation coefficient K, so as to carry out active noise reduction according to the parameter W; or, the active noise reduction unit can also directly determine the parameter W of the active noise reduction unit according to the working condition signal, so as to carry out active noise reduction according to the parameter W.
Specifically, in the present embodiment, when the noise reduction is performed on the tail sound field of the vacuum cleaner, K only needs to be calculated when the noise reduction is performed for the first time, and then the noise reduction parameter W only needs to be adjusted according to the foregoing manner according to different working conditions caused by different parameters such as the rotation speed of the motor. When the sound field in the front of the dust collector is subjected to noise reduction, or the sound field structure in the cavity is different due to the fact that different brush heads are replaced, the coefficient K needs to be calculated again. That is, when the sound field structure is changed, the calculation coefficient K needs to be adjusted first, otherwise, only the parameter W of the active noise reduction unit needs to be adjusted directly. Therefore, in an embodiment of the present application, when the calculation coefficient of the sound field structure does not need to be calculated, after the first signal reflecting the working condition of the vacuum cleaner is obtained, the noise reduction parameter is determined according to the first signal, and the second signal for driving the emission of the noise reduction sound wave is adjusted according to the noise reduction parameter, where the noise reduction sound wave is used for reducing noise of the sound field of the vacuum cleaner.
The signal acquisition unit can be realized by matching a sampling resistor with a voltage or current sensing device and an analog-to-digital converter or directly through a signal sampling element. The working condition of the dust collector can be converted into an electric signal to be output by connecting the dust collector in series or in parallel with a dust collector battery 5 or other energy supply devices or other output ends of circuit units capable of reflecting the working condition of the dust collector. Therefore, the invention can realize the adjustment of the space active noise reduction system based on the corresponding relation between the working condition and the electric signal, and based on the different operation working conditions of the machine, the corresponding electric signal change is generated, and the corresponding space field calculation coefficient K is determined through the sound field adaptation subunit according to the electric signal change on the lines of the battery board and the like of the dust collector, thereby realizing the optimization of the active noise reduction effect under the working condition.
The sound field adaptation subunit can pre-store a calculation coefficient K of the adaptive active noise reduction spatial field of the dust collector under different working conditions, and can also obtain the calculation coefficient K through calculation. The method comprises the steps of receiving a signal reflecting the operation condition mode of the dust collector, determining the operation mode or the operation condition of a machine based on the signal, and sending a calculation coefficient K which is required to be used and corresponds to a processor under the operation condition to a noise reduction processor.
After the noise reduction processor receives the calculation coefficient K of the spatial field determined by the sound field adaptation subunit, the processor performs matching calculation of the noise reduction parameter W according to the current calculation coefficient K, and then performs an active noise reduction process of the spatial field. The active noise reduction unit selects the corresponding noise reduction parameter W according to the proper K, and then the noise reduction under the general condition can be carried out. Within a certain range, the higher the W order, the better the noise reduction effect achieved by the method.
In the noise reduction process, each output end of the active noise reduction system is respectively based on the noise reduction parameter [ w ] of the corresponding noise reduction channell，1，wl，2，...，wl，J]TAnd generating a driving signal to drive the loudspeaker to generate noise reduction sound waves to achieve an ideal noise reduction effect.
The number of the input ends or the output ends can be flexibly set to be at least one according to the structure of the dust collector or the noise reduction requirement.
Therefore, the invention can solve the bottleneck of traditional noise reduction, adopts a space active noise reduction mode to offset noise, and reduces the medium-high frequency noise of the dust collector. Secondly, the active noise reduction system has simple structure and high execution efficiency, ensures the noise reduction effect and saves the space required by noise reduction, is particularly suitable for the wireless handheld dust collector, can ensure the portability of the machine body and has enough endurance time.
Under a better implementation mode, because the actual working condition of the dust collector is more complex, the corresponding relation between the working condition and the noise sound field is not necessarily clear in the early test process, and the noise reduction effect of the noise reduction parameter W under some working conditions, which is acted on the output end of the active noise reduction system, is not necessarily satisfactory. Therefore, the invention can further design a correction mechanism for the noise reduction parameter W, when the noise signal energy after noise reduction is detected to be higher than the set threshold value, the noise reduction parameter W of the processor is recalculated and stored in the processor, and the update of the parameter W is realized to ensure the noise reduction effect under the actual working condition environment.
The action process of the correction mechanism is as follows:
firstly, collecting noise signals after active noise reduction
Second, noise signal after active noise reduction
When the energy exceeds a set threshold Tv, updating a noise reduction parameter W, and actively reducing noise according to the updated noise reduction parameter W;
wherein the step of updating the noise reduction parameter W comprises:
according to total energy of sound field
Adjusting the noise reduction parameter W to enable the total energy En of the corresponding sound field to be minimum; updating the noise reduction parameter W to an adjusted value;
the principle of the above correction mechanism is as follows:
noise after active noise reduction
When the signal energy exceeds (is not less than) the set threshold value Tv, the noise collected by the first error input end of the active noise reduction system
Wherein N isl(n) represents the original noise signal collected by the first reference input end of the active noise reduction system at the time n; w is al，j(n) represents the j-th order noise reduction parameter updated by the l-th noise reduction channel of the active noise reduction system at the time n;
representing the anti-phase noise reduction sound wave emitted by the ith noise reduction channel. Noise after noise reduction
The noise data is the set of the noise collected by the error input end in the active noise reduction system and can reflect the total energy of the sound field after noise reduction. Each input end can be set as a dedicated microphone, and can also be multiplexed with other microphones in the system. The microphone may not be a main noise signal collection device, but an input device for feedback of effects to the system.
The relationship between the total energy of the sound field and the calculation coefficient of the sound field is as follows:
wherein the content of the first and second substances,
can be obtained by calculating the inverse fourier transform of the coefficient K. Due to noise after active noise reduction
The original noise signal and the noise reduction parameter W are determined, so that the parameter W which enables the total energy En of the sound field to be minimum is obtained, the corresponding parameter W is updated into the processor, and the processor can output the driving signal which corresponds to the optimal effect under the working conditionAnd the loudspeaker is driven, so that the sound field offset effect can be improved, and the working noise of the machine is reduced.
Referring to the manner shown in fig. 2, two types of input devices may be respectively disposed in the system: one is used for gathering the original noise data and reducing the noise actively; the other input device is used for adjusting the noise reduction parameters W required by the anti-phase noise reduction sound waves emitted by the system so as to optimize the noise reduction effect. The input device may be designed as two or more microphones and the output device may be realized as two or more loudspeakers.
Furthermore, the same noise reduction effect can also be achieved by the means of fig. 3. The input device can replace the two input devices by multiplexing functions, and the active noise reduction and the updating of the parameter W of the active noise reduction unit are both realized by the same group of input device hardware. That is, in this implementation, the "1 microphone" can be used for residual noise monitoring during the update of the parameter W and as a basis for generating the noise reduction sound wave during active noise reduction. That is, the number of the microphones selected for the input device may be two or two, or may be one/one.
Preferably, the update mechanism may be implemented by using a common active noise reduction system, and implemented by integrating a corresponding adaptive algorithm in a noise reduction motherboard chip. Of course, the skilled person should not exclude that the above-mentioned updating process of the parameter W is implemented by a relatively independent control unit or control chip.
In order to further absorb the noise in the air duct, the dust collector can be further provided with a passive noise reduction material such as the sound absorption cotton 3 in the figure 1 in the air duct or the shell, so that the noise of a sound field is further absorbed, and the noise reduction effect is improved.
Fig. 4 is a schematic structural diagram of a spatial active noise reduction device according to an embodiment of the present disclosure. As shown in fig. 4, the spatially active noise reduction apparatus 400 includes:
the receiving module 401 is configured to obtain a first signal reflecting the working condition of the device to be denoised;
a noise reduction parameter determination module 402 configured to determine noise reduction parameters from the first signal; and
an adjusting module 403, configured to adjust a second signal for driving emission of a noise reduction sound wave according to the noise reduction parameter, where the noise reduction sound wave is used to reduce noise in a sound field of the device to be noise reduced.
In an embodiment of the present application, the noise reduction parameter determining module 402 is further configured to: determining a calculation coefficient for representing the sound field structure according to the first signal; and determining a noise reduction parameter according to the calculation coefficient.
In an embodiment of the present application, the noise reduction parameter determining module 402 is further configured to: when the noise signal energy after the noise reduction of the sound field exceeds a set threshold value, updating noise reduction parameters; and the adjustment module 403 is further configured to: the second signal is adjusted according to the updated noise reduction parameters.
In an embodiment of the present application, the noise reduction parameter determining module 402 is further configured to: adjusting noise reduction parameters to minimize the total energy of the sound field after the noise of the sound field is reduced; and updating the noise reduction parameters to the adjusted values.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the apparatuses and modules described above may refer to the corresponding processes in the foregoing embodiments, and are not described herein again.
Therefore, the invention not only can directly solve the noise reduction bottleneck, but also can well reduce medium-high frequency noise under the conditions of not occupying internal space and limiting the pasting volume of the sound absorption material. The invention has almost no influence on the weight of the machine body which is particularly concerned by the handheld dust collector, can not increase the mass of the machine body, and has quite limited influence on the power consumption or the endurance time of the dust collector. The space active noise reduction system adopts the space field active noise reduction algorithm aiming at the dust collector, ensures the processing efficiency and does not excessively consume electric quantity, and the system can be suitable for the adjustable dust collector with multiple gears.
Fig. 5 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the application. As shown in fig. 5, the computer-readable storage medium 502 has stored thereon computer program instructions, which, when executed by the processor 501, cause the processor 501 to perform the steps of the above-mentioned spatial active noise reduction method of this specification.
Computer-readable storage media 502 may take any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may include, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory ((RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (10)
1. A method of spatially active noise reduction, comprising:
acquiring a first signal reflecting the working condition of equipment to be denoised;
determining noise reduction parameters from the first signal; and
and adjusting a second signal for driving to emit noise reduction sound waves according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the equipment to be noise reduced.
2. The spatially active noise reduction method of claim 1, wherein determining noise reduction parameters from the first signal comprises:
determining a calculation coefficient characterizing the sound field structure from the first signal; and
and determining the noise reduction parameters according to the calculation coefficients.
3. The spatially active noise reduction method of claim 1, further comprising: and when the energy of the noise signal after the noise reduction of the sound field exceeds a set threshold value, updating the noise reduction parameter, and adjusting the second signal according to the updated noise reduction parameter.
4. The spatially active noise reduction method of claim 3, wherein updating the noise reduction parameters comprises:
adjusting the noise reduction parameters to minimize the total energy of the sound field after the sound field is subjected to noise reduction; and
and updating the noise reduction parameters to the adjusted values.
5. A spatially active noise reduction apparatus, comprising:
the receiving module is configured to obtain a first signal reflecting the working condition of the equipment to be denoised;
a noise reduction parameter determination module configured to determine noise reduction parameters from the first signal; and
and the adjusting module is configured to adjust a second signal for driving the emission of noise reduction sound waves according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the device to be noise reduced.
6. A spatially active noise reduction system, comprising:
the signal acquisition unit is used for acquiring a first signal reflecting the working condition of the equipment to be denoised;
and the active noise reduction unit is used for determining noise reduction parameters according to the first signal and adjusting a second signal for driving noise reduction sound waves to be emitted according to the noise reduction parameters, wherein the noise reduction sound waves are used for reducing noise of the sound field of the equipment to be noise reduced.
7. The spatially active noise reduction system of claim 6, wherein the active noise reduction unit comprises:
a sound field adaptation subunit for determining, from the first signal, a calculation coefficient characterizing the sound field structure; and
and the filtering configuration subunit is used for determining the noise reduction parameters according to the calculation coefficients.
8. The spatially active noise reduction system of claim 7, wherein the signal acquisition unit comprises: the input equipment is arranged in the equipment to be denoised and is used for acquiring noise signals of the sound field; the noise signal comprises noise after noise reduction of the sound field;
the active noise reduction unit further includes:
the noise reduction detection subunit is used for detecting whether the noise signal energy after the noise reduction of the sound field exceeds a set threshold value; and
and the filtering adaptation subunit is used for updating the noise reduction parameters when the noise signal energy after the noise reduction of the sound field exceeds the set threshold value.
9. A vacuum cleaner comprising a storage medium having program instructions stored therein that are executable by a processor, the program instructions when executed performing the method of any of claims 1 to 4.
10. A computer readable storage medium having computer program instructions stored thereon, which, when executed by a processor, cause the processor to perform the method of any of claims 1 to 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910884302 | 2019-09-19 | ||
| CN2019108843022 | 2019-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111938504A true CN111938504A (en) | 2020-11-17 |
| CN111938504B CN111938504B (en) | 2022-04-29 |
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