CN112509548A - Active noise reduction device and system for outdoor environment noise - Google Patents
Active noise reduction device and system for outdoor environment noise Download PDFInfo
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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
- G10K11/17821—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 characterised by the analysis of the input signals only
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
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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
- G10K11/17821—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 characterised by the analysis of the input signals only
- G10K11/17825—Error signals
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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
- G10K11/1787—General system configurations
- G10K11/17879—General system configurations using both a reference signal and an error signal
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Abstract
The invention relates to the technical field of noise reduction, in particular to active noise reduction equipment and a system for outdoor environmental noise, wherein the active noise reduction equipment comprises a shell, wherein a convex cover body is fixedly arranged on the shell; the convex cover body comprises an outer convex part, a first inner concave part and a second inner concave part which are positioned on the left side and the right side of the outer convex part; the outer convex part is fixedly provided with a loudspeaker; the first concave part is fixedly provided with an acceleration sensor, and the second concave part is fixedly provided with a microphone; an audio chip, a DSP chip, a storage unit, a network transmission interface and a chip power supply are fixedly arranged in the shell; the microphone and the loudspeaker are respectively connected with the audio chip through signals; the audio chip and the acceleration sensor are respectively in signal connection with the DSP chip; the DSP chip and the network transmission interface are respectively in signal connection with the storage unit; the DSP chip and the audio chip are respectively electrically connected with a chip power supply. This scheme of adoption can promote noise source data acquisition's accuracy.
Description
Technical Field
The invention relates to the technical field of noise reduction, in particular to active noise reduction equipment and system for outdoor environment noise.
Background
In real places of work and life, various noises are common, and the noises often cause various injuries to physical and psychological health of surrounding personnel and even influence and damage production work on site. Therefore, in order to achieve the purpose of noise reduction, two methods, namely active noise reduction and passive noise reduction, are often adopted, and the active noise reduction function is to generate reverse sound waves equal to external noise through a noise reduction system to neutralize the noise, so that the noise reduction effect is realized.
For example, a document with chinese patent publication No. CN109714668A discloses an indoor active noise reducer, a noise reduction method, and a storage medium, where the indoor active noise reducer includes: noise detection module, the module of making an uproar, the reverse sound wave module of offsetting of production fall in the initiative, the module of making an uproar falls in the initiative and is connected with noise detection module and the reverse sound wave module of offsetting of production respectively, and noise detection module includes: a microphone array; the noise detection module is used for detecting indoor scene noise source data by adopting a microphone array noise estimation algorithm; the active noise reduction module is used for generating a noise reduction signal according to the noise source data and an active noise reduction algorithm; and the reverse cancellation sound wave generation module is used for generating reverse cancellation sound waves according to the denoising signals and superposing the reverse cancellation sound waves with the noise to be eliminated.
According to the scheme, noise source data in a scene are detected through the microphone array, the active noise reduction module generates reverse cancellation sound waves according to an active noise reduction algorithm, and the reverse cancellation sound waves are played through the loudspeaker, so that the noise reduction effect is achieved. However, the noise source data belongs to sound wave signals, and the sound wave signals are collected in real time through the microphone array to have a certain phase difference, namely the physical distances of all microphone arrays in the microphone array are different, and the sound wave signals received by other microphones can be preceded by the microphone close to the noise source; the active noise reduction algorithm needs to process a plurality of sound waves with the same waveform and different phases at the same time to generate repeated and invalid operation, so that the operation load of the processor is increased, and the problem of low accuracy exists.
Disclosure of Invention
The invention aims to provide active noise reduction equipment and system for outdoor environment noise, which can solve the problem of low accuracy of data acquisition of a noise source.
The basic scheme provided by the invention is as follows: the active noise reduction equipment for the outdoor environmental noise comprises a shell, wherein a convex cover body is fixedly arranged on the shell; the convex cover body comprises an outer convex part, a first inner concave part and a second inner concave part which are positioned on the left side and the right side of the outer convex part; the outer convex part is fixedly provided with a loudspeaker; the first concave part is fixedly provided with an acceleration sensor, and the second concave part is fixedly provided with a microphone;
an audio chip, a DSP chip, a storage unit, a network transmission interface and a chip power supply are fixedly arranged in the shell; the microphone and the loudspeaker are respectively connected with the audio chip through signals; the audio chip and the acceleration sensor are respectively in signal connection with the DSP chip; the DSP chip and the network transmission interface are respectively in signal connection with the storage unit; the DSP chip and the audio chip are respectively electrically connected with a chip power supply.
The working principle and the advantages of the invention are as follows: compared with the prior art that noise is collected through a double-microphone or microphone array, the scheme improves and optimizes the external physical structure of the active noise reduction equipment, the loudspeaker and the microphone are respectively arranged on the outer convex part and the inner concave part of the convex cover body and are distributed in a stepped manner, so that the phenomenon of acoustic feedback easily caused by too close of the loudspeaker and the microphone can be avoided, and the accuracy of noise source data is improved; in addition, by arranging a single microphone, a plurality of repeated sound waves do not exist, invalid operation can be avoided, and the operation load of the processor is reduced; finally, through setting up acceleration sensor in another interior recess of type of protruding lid, compare with current two microphones, utilize acceleration sensor to replace one of them microphone, not only can avoid carrying out the problem that the noise source gathers and lead to the sound wave to have the phase difference through two microphones, can also provide the information of another dimension through acceleration sensor to guarantee the validity of noise source data.
Further, the outer surface of the first inner concave part is fixed with a vibration stopping plate. This scheme of adoption sets up through the surface at first interior concave part and ends the shake board, can avoid the precision that the production vibrations on the active noise reduction equipment influence the acceleration sensor testing result.
Furthermore, sound absorption materials are fixed on the outer surfaces of the outer convex part and the second inner concave part. The sound played by the loudspeaker can be prevented from being detected by the microphone through the sound absorption material.
Further, the acceleration sensor is a polycrystalline silicon nano-film acceleration sensor, the audio chip is TLV320AIC23, the DSP chip is TMS320C6416, and the chip power supply is TPS73HD318 PWP. Because the sensor can perceive the vibration signal of the frequency section concerned by people, compared with most acceleration sensors on the market, the polysilicon nano-film acceleration sensor has small volume and high sensitivity, and can more effectively acquire noise vibration. In addition, the compatibility of the DSP chip, the audio chip and the chip power supply is very good, physical matching and framework can be carried out more efficiently, the arrangement space is reduced, the risk of data loss is reduced, and the method has the advantages of low cost, strong comprehensive algorithm calculation capability, rich interfaces and the like.
Furthermore, the solar cell module also comprises a solar cell fixedly arranged at the bottom of the shell, and the solar cell is electrically connected with the chip power supply. This scheme of adoption through setting up solar cell, can make the initiative equipment of making an uproar that falls be applicable to field work more.
The invention also provides an active noise reduction system for outdoor environmental noise, which comprises a polycrystalline silicon nano-film acceleration sensor, a microphone, an audio chip, a DSP chip, a storage unit and a loudspeaker, wherein:
the polycrystalline silicon nano-film acceleration sensor is used for collecting vibration frequency information of a noise source in a current scene;
the audio chip is used for receiving the noise analog signal collected by the microphone, and performing analog-to-digital conversion on the noise analog signal to generate a noise digital signal;
the storage unit is used for pre-storing vibration frequency information and digital signals of a plurality of specific noises and reverse sound wave signals generated after the specific noises are processed by an active noise reduction algorithm;
the DSP chip is used for matching pre-stored reverse sound wave signals from the storage unit according to the vibration frequency information and the noise digital signals of the noise source in the current scene;
the audio chip is used for receiving the reverse sound wave signals and generating reverse offset sound waves after digital-to-analog conversion;
the loudspeaker is used for playing the reverse cancellation sound wave.
Has the advantages that: in the using process, firstly, respectively acquiring vibration frequency information and analog signals of a noise source in the current scene through a polycrystalline silicon nano-film acceleration sensor and a microphone, and then performing analog-to-digital conversion on the noise analog signals through an audio chip to obtain noise digital signals; the storage unit is pre-stored with vibration frequency information and digital signals of a plurality of specific noises and inverse sound wave signals generated after the specific noises are processed by an active noise reduction algorithm; the pre-stored reverse sound wave signals can be matched from the storage unit through the DSP chip according to the vibration frequency information and the noise digital signals of the noise source in the current scene; finally, the audio chip receives the reverse sound wave signal, and generates reverse offset sound wave after digital-to-analog conversion; the reverse cancellation sound waves are played through a speaker to reduce the effect of the noise source.
The noises which people feel uncomfortable are only specific noises, such as the booming sound of a motor vehicle, construction site noise and the like; the scheme mainly matches the reverse sound wave information of specific noise from the storage unit through the vibration frequency information of the noise source and the noise digital signal, and compared with the method for processing the noise in real time according to an active noise reduction algorithm in the prior art, the method can reduce the operation difficulty and the operation amount of the system and has higher efficiency of generating the reverse sound wave information; in addition, because the nature of sound is energy wave, this scheme provides the information of another dimension for discerning the noise through setting up the vibration frequency information that acceleration sensor detected the noise, can make the discernment result more accurate.
Further, the solar cell module also comprises a chip power supply and a solar cell;
the chip power supply is used for respectively supplying power to the DSP chip and the audio chip;
the solar cell is used for converting solar energy into electric energy and transmitting the electric energy to the chip power supply.
Has the advantages that: through setting up solar cell, can make the initiative equipment of making an uproar that falls be applicable to field work more.
Further, the system also comprises a background terminal; the DSP chip is also used for screening the specific noise in the storage unit according to the vibration frequency information and the noise digital signal of the noise source in the current scene, and forwarding the vibration frequency information and the noise digital signal of the noise source to the background terminal if the corresponding specific noise cannot be matched from the database;
the background terminal is used for processing the noise digital signal according to an active noise reduction algorithm to generate a corresponding reverse sound wave signal; and transmits the vibration frequency information of the noise, the noise digital signal, and the reverse acoustic wave signal to the storage unit.
Has the advantages that: by adopting the scheme, if the noise source in the current scene is not specific noise, the noise can be subjected to noise reduction treatment by a background technician through the background terminal, and the noise is forwarded to the storage unit after noise reduction is finished, so that updating and expansion of prestored resources are finished, and a better comprehensive noise reduction effect is achieved.
Further, the DSP chip is further configured to extract amplitude information and frequency information of the noise digital signal, and match a corresponding specific noise according to the amplitude information and the frequency information, and if an amplitude difference between the noise digital signal and the specific noise is smaller than a preset amplitude threshold and a frequency difference is smaller than a preset frequency threshold, determine that the specific noise is the same as a noise source of the current scene.
Has the advantages that: the scheme is intended to provide a specific mode for matching specific noise according to a noise source, and the specific noise with similar amplitude and frequency can be conveniently matched.
Further, the DSP chip is also used for judging whether a plurality of specific noises are the same as the noise sources of the current scene in the storage unit, if so, the vibration frequency information of the noise sources in the current scene is used as a reference quantity, the difference value between the vibration frequency information of each specific noise and the reference quantity is calculated, and the specific noise with the minimum difference value is output.
Has the advantages that: by adopting the scheme, when specific noise is matched, the matching result is corrected through the vibration frequency information acquired by the acceleration sensor, so that the specific noise with higher accuracy is conveniently matched.
Drawings
Fig. 1 is a schematic structural diagram of an active noise reduction device and system for outdoor environmental noise according to a first embodiment of the present invention.
Fig. 2 is a system block diagram of an active noise reduction device and system for outdoor environmental noise according to a first embodiment of the present invention.
Detailed Description
The following is further detailed by the specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a shell 1, a convex cover body 2, a loudspeaker 3, an acceleration sensor 4 and a microphone 5.
Example one
An active noise reduction device for outdoor environmental noise is basically shown as figure 1, and comprises a shell 1, wherein a convex cover body 2 is fixedly arranged on the shell 1; the convex cover body 2 comprises an outer convex part, a first inner concave part and a second inner concave part which are positioned at the left side and the right side of the outer convex part; the outer convex part is bonded with a loudspeaker 3; the first concave part is adhered with an acceleration sensor 4, and the second concave part is adhered with a microphone 5;
an audio chip, a DSP chip, a storage unit, a network transmission interface and a chip power supply are fixedly arranged in the shell 1; the microphone 5 and the loudspeaker 3 are respectively connected with an audio chip through signals; the audio chip and the acceleration sensor 4 are respectively in signal connection with the DSP chip; the DSP chip and the network transmission interface are respectively in signal connection with the storage unit; the DSP chip and the audio chip are respectively electrically connected with a chip power supply.
Specifically, the acceleration sensor 4 is a polysilicon nano-film acceleration sensor 4, the audio chip is TLV320AIC23, the DSP chip is TMS320C6416, and the chip power supply is TPS73HD318 PWP.
In other embodiments, in order to prevent the vibration generated on the active noise reduction device from affecting the accuracy of the detection result of the acceleration sensor 4, a vibration-stopping plate is bonded to the outer surface of the first inner concave portion. Sound absorption materials are bonded on the outer surfaces of the outer convex part and the second inner concave part, and the sound absorption materials are common silencing cotton on the market; the microphone 5 can be prevented from directly collecting the sound played by the loudspeaker 3 to influence the collection of the noise source.
Based on the active noise reduction device, the scheme further provides an active noise reduction system for outdoor environmental noise of a user, which is basically as shown in fig. 2 and comprises a polycrystalline silicon nano-film acceleration sensor, a microphone, an audio chip, a DSP chip, a storage unit and a loudspeaker, wherein:
the polycrystalline silicon nano-film acceleration sensor is used for collecting vibration frequency information of a noise source in a current scene;
the audio chip is used for receiving the noise analog signal collected by the microphone, and performing analog-to-digital conversion on the noise analog signal to generate a noise digital signal;
the storage unit is used for pre-storing vibration frequency information and digital signals of a plurality of specific noises and reverse sound wave signals generated after the specific noises are processed by an active noise reduction algorithm;
the DSP chip is used for matching pre-stored reverse sound wave signals from the storage unit according to the vibration frequency information and the noise digital signals of the noise source in the current scene; specifically, in this embodiment, the DSP chip is further configured to extract amplitude information and frequency information of the noise digital signal, and match a corresponding specific noise according to the amplitude information and the frequency information, and if an amplitude difference between the noise digital signal and the specific noise is smaller than a preset amplitude threshold (a value range of the preset amplitude threshold is [0,1] dB, which is set to 1dB in this embodiment), and a frequency difference is smaller than a preset frequency threshold (a value of the preset frequency threshold is [0, 15] Hz, which is set to 10Hz in this embodiment), determine that the specific noise is the same as the noise source of the current scene. For example, the frequency information of a noise digital signal collected in the current scene is 100Hz, and the amplitude is 3 dB; the frequency of the specific noise A prestored in the storage unit is 95Hz, the amplitude of the specific noise A is 2.5dB, the frequency difference of 100Hz-95Hz (5Hz < 10Hz) and the amplitude difference of 3dB-2.5dB (0.5dB < 1dB) are obtained through comparison, namely the specific noise is judged to meet the condition, and the noise in the current scene can be reduced by playing the reverse sound wave of the specific noise A.
The DSP chip is also used for judging whether a plurality of specific noises are the same as the noise sources of the current scene in the storage unit, if so, the vibration frequency information of the noise sources in the current scene is used as a reference quantity, the difference value between the vibration frequency information of each specific noise and the reference quantity is calculated, and the specific noise with the minimum difference value is output. For example, in addition to the specific noise a, a specific noise B is also matched, the amplitude and the frequency of the noise digital signal are respectively 0.5dB and 98Hz, and the amplitude difference and the frequency difference with the noise digital signal in the current scene are also smaller than the preset amplitude threshold and the preset frequency threshold, which indicates that more than one (i.e. the number of matched specific noises is more than one) is the same as the noise source of the current scene, it is necessary to extract the vibration frequency information "93 Hz" collected by the polysilicon nano-film acceleration sensor as a reference, find that the frequency differences between the specific noise a and the specific noise B and the reference are respectively 2Hz and 5Hz, and judge that the specific noise a is the smallest difference because 2Hz < 5Hz, so that the specific noise a is output.
The types of specific noise mainly comprise traffic noise, construction noise, social noise and equipment noise; wherein: the traffic noise mainly comprises motor vehicle whistle and engine rumbling, the construction noise comprises excavation noise and beating sound in the building site, the social noise is square dance music noise, and the equipment noise comprises the running noise of the home machinery equipment.
It is worth mentioning that: in the scheme, the vibration frequency information acquired by the polycrystalline silicon nano-film acceleration sensor is used as a reference quantity for auxiliary judgment; in other embodiments, since the nature of sound is energy waves, the high-sensitivity acceleration sensor can well obtain the basic information of noise, such as frequency, amplitude and phase, so the reference quantity can also be the amplitude and phase collected by the sensor, and the matching and comparing mode of the amplitude and the phase is similar to the vibration frequency, or the combination of the three is used for comparison and judgment, which is not described herein again.
And the noise analog signal collected by the microphone, the noise digital signal after analog-to-digital conversion and the noise waveform also have a vibration frequency information which is used for directly comparing with the pre-stored specific noise, and if a plurality of specific noises can be matched after the vibration frequency information of the noise waveform is compared, the vibration frequency information collected by the polysilicon nano-film acceleration sensor is introduced for auxiliary judgment. Firstly, matching specific noise through the amplitude and frequency of a noise digital signal waveform, taking vibration frequency information acquired by the polycrystalline silicon nano-film acceleration sensor as a standby auxiliary item, only acquiring and storing the standby auxiliary item, and not relating to the processing of data, so that the problem of large calculation amount can be avoided, and the active noise reduction effect under most conditions can be basically realized; and on the basis, the active noise reduction of the case and some special cases is also completed, namely, the auxiliary judgment of the identification result is carried out on the signal acquired by another type of sensor, so that the accuracy of the matching result can be improved.
The audio chip is used for receiving the reverse sound wave signals and generating reverse offset sound waves after digital-to-analog conversion; the speaker is used to play the reverse cancellation sound wave.
Specifically, in other embodiments, the specific noise resource is pre-stored in the memory unit for updating; the system also comprises a background terminal; the DSP chip is also used for screening the specific noise in the storage unit according to the vibration frequency information and the noise digital signal of the noise source in the current scene, and forwarding the vibration frequency information and the noise digital signal of the noise source to the background terminal if the corresponding specific noise cannot be matched from the database; the background terminal is used for processing the noise digital signal according to an active noise reduction algorithm to generate a corresponding reverse sound wave signal; and transmits the vibration frequency information of the noise, the noise digital signal, and the reverse acoustic wave signal to the storage unit. In the scheme, if the matching is carried out, no corresponding specific noise exists in the database, the fact that the noise source in the current scene belongs to nonspecific noise is indicated, and a background technician can update the database remotely on line through a background terminal so as to adapt to the change of the scene change noise. Compared with the prior art that the noise digital signals are analyzed in real time through the active noise reduction equipment and the reverse sound waves are obtained, the scheme can reduce the operation amount and the operation difficulty of the active noise reduction equipment processor and improve the operation efficiency; meanwhile, the noise reduction of nonspecific noise under some conditions can be dealt with.
Example two
Compared with the first embodiment, the audio chip is different only in that the audio chip further comprises a chip power supply and a solar cell, wherein the chip power supply is used for respectively supplying power to the DSP chip and the audio chip; the solar cell is used for converting solar energy into electric energy and transmitting the electric energy to the chip power supply. Namely, the active noise reduction device structurally further comprises a solar cell fixedly arranged at the bottom of the shell, and the solar cell is electrically connected with a chip power supply. This scheme of adoption through setting up solar cell, can make the initiative equipment of making an uproar that falls be applicable to field work more.
EXAMPLE III
Compared with the first embodiment, the difference is that the DSP chip is further configured to obtain a noise type name input by the user through a mobile phone end in a personalized manner, and if the noise type name is the same as the specific noise type name, the matched specific noise type is screened according to the noise type name input by the user, so as to obtain reverse sound wave information of the specific noise with the same type name. For example, in the scheme, the user A does not want to hear the noise, such as the rumbling sound of an automobile engine, the digging noise and the knocking sound in a building site, and can complete personalized selection through a mobile phone end; after the active noise reduction equipment analyzes the current scene noise source, the matched specific noise types comprise the booming sound of an automobile engine, the whistling sound of a motor vehicle, the digging noise and the knocking sound in a construction site; when the specific noises with the same type name are the rumbling sound of an automobile engine, the digging noise and the knocking sound in a construction site, only the reverse sound wave information of the specific noises with the same type is matched.
The noise type name also comprises music noise (such as common square dance in life or music sound transmitted from neighbor houses), the DSP chip is also used for judging whether the noise type name input by the user through the mobile phone terminal is the music noise, if so, the noise source is listened to and identified, and corresponding song information is identified; and capturing music sound waves according to the song information, processing the music sound waves through an active noise reduction algorithm, and processing a reverse sound wave signal.
When music noise is processed, the noise source can be predicted through the song listening and music identification function, namely song information is identified after the song information is collected by a microphone for a period of time (the longest existing song is 15 seconds), and then the music sound wave of the song is derived; finally, the reverse sound wave is played through the microphone, and therefore the interference of music noise is reduced. Compared with the prior art that the sound information of the noise source is collected in real time through the microphone, the scheme can identify the noise source and match the music sound wave through the song, and the processing efficiency of the reverse sound wave signal can be improved.
In another embodiment, a human body infrared induction sensor is fixed on the active noise reduction device and is in signal connection with the DSP chip; the DSP chip is used for judging whether a person is in the current scene or not according to the detection result of the human body infrared induction sensor, and if not, the microphone and the acceleration sensor are controlled to automatically enter a dormant state; thereby reducing power consumption. Correspondingly, in order to facilitate a user to wake up the active noise reduction device by using a mobile phone end, the DSP chip is further configured to receive a control instruction initiated by the user through the mobile phone end, and if the control instruction is a wake-up instruction, wake up the microphone and the acceleration sensor to enter a working state.
The microphone is characterized by comprising a holder for carrying the active noise reduction equipment to move and another microphone, wherein the other microphone is fixed compared with the microphone on the active noise reduction equipment. In this way, the sound wave information collected by the two microphones is respectively sent to the DSP chip, and the DSP chip processes the two sound wave information to obtain the direction of the noise source; the principle is similar to binaural response, sound waves of a noise source are received through two sound collection points, and the direction of the noise source can be determined; the DSP chip is further configured to, during the movement of the active noise reduction device, obtain a detection result of the human infrared sensor (in other embodiments, a camera may also be used to collect a graphic to determine position information of a user), input a motion trajectory of the active noise reduction device (in this embodiment, the active noise reduction device mainly moves left and right, and the motion trajectory is a horizontal line), an orientation of the noise source, and user position information into a preset mathematical model, obtain a connection line between the noise source and the user in the mathematical model, obtain an intersection point coordinate of the connection line and the motion trajectory of the active noise reduction device, and control the pan-tilt head to drive the active noise reduction device to move at the intersection point coordinate.
According to the scheme, the position of a user and the direction of a noise source (mainly aiming at a fixed noise source such as square dance and construction site) are respectively determined by combining a human body infrared sensor and a microphone, and then the active noise reduction equipment moves through a holder, so that the active noise reduction equipment is always positioned between the user and the noise source, and the reverse sound wave generated by a loudspeaker reduces noise; the active noise reduction equipment can be dynamically adjusted according to the position of the user, the user can be helped to block noise sound waves of a noise source, and the noise reduction effect is better.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The active noise reduction equipment for the outdoor environmental noise is characterized by comprising a shell, wherein a convex cover body is fixedly arranged on the shell; the convex cover body comprises an outer convex part, a first inner concave part and a second inner concave part which are positioned on the left side and the right side of the outer convex part; the outer convex part is fixedly provided with a loudspeaker; the first concave part is fixedly provided with an acceleration sensor, and the second concave part is fixedly provided with a microphone;
an audio chip, a DSP chip, a storage unit, a network transmission interface and a chip power supply are fixedly arranged in the shell; the microphone and the loudspeaker are respectively connected with the audio chip through signals; the audio chip and the acceleration sensor are respectively in signal connection with the DSP chip; the DSP chip and the network transmission interface are respectively in signal connection with the storage unit; the DSP chip and the audio chip are respectively electrically connected with a chip power supply.
2. The active noise reduction device for outdoor ambient noise according to claim 1, characterized in that: and a vibration stopping plate is fixed on the outer surface of the first inner concave part.
3. The active noise reduction device for outdoor ambient noise according to claim 2, characterized in that: and sound absorption materials are fixed on the outer surfaces of the outer convex part and the second inner concave part.
4. The active noise reduction device for outdoor ambient noise according to claim 3, characterized in that: the acceleration sensor is a polycrystalline silicon nano-film acceleration sensor, the audio chip is TLV320AIC23, the DSP chip is TMS320C6416, and the chip power supply is TPS73HD318 PWP.
5. The active noise reduction device for outdoor ambient noise according to claim 4, characterized in that: the solar cell is fixedly arranged at the bottom of the shell and is electrically connected with the chip power supply.
6. An active noise reduction system for outdoor environmental noise, which is characterized by comprising a polysilicon nano-film acceleration sensor, a microphone, an audio chip, a DSP chip, a storage unit, a network transmission interface and a loudspeaker, wherein:
the polycrystalline silicon nano-film acceleration sensor is used for collecting vibration frequency information of a noise source in a current scene;
the audio chip is used for receiving the noise analog signal collected by the microphone, and performing analog-to-digital conversion on the noise analog signal to generate a noise digital signal;
the storage unit is used for pre-storing vibration frequency information and digital signals of a plurality of specific noises and reverse sound wave signals generated after the specific noises are processed by an active noise reduction algorithm;
the DSP chip is used for matching pre-stored reverse sound wave signals from the storage unit according to the vibration frequency information and the noise digital signals of the noise source in the current scene;
the audio chip is used for receiving the reverse sound wave signals and generating reverse offset sound waves after digital-to-analog conversion;
the loudspeaker is used for playing the reverse cancellation sound wave.
7. The active noise reduction system for outdoor ambient noise according to claim 6, characterized in that: the solar cell module also comprises a chip power supply and a solar cell;
the chip power supply is used for respectively supplying power to the DSP chip and the audio chip;
the solar cell is used for converting solar energy into electric energy and transmitting the electric energy to the chip power supply.
8. The active noise reduction system for outdoor ambient noise according to claim 7, characterized in that: the system also comprises a background terminal; the DSP chip is also used for screening the specific noise in the storage unit according to the vibration frequency information and the noise digital signal of the noise source in the current scene, and forwarding the vibration frequency information and the noise digital signal of the noise source to the background terminal if the corresponding specific noise cannot be matched from the database;
the background terminal is used for processing the noise digital signal according to an active noise reduction algorithm to generate a corresponding reverse sound wave signal; and transmits the vibration frequency information of the noise, the noise digital signal, and the reverse acoustic wave signal to the storage unit.
9. The active noise reduction system for outdoor ambient noise according to claim 8, characterized by: the DSP chip is also used for extracting amplitude information and frequency information of the noise digital signal, matching corresponding specific noise according to the amplitude information and the frequency information, and judging that the specific noise is the same as a noise source of the current scene if the amplitude difference between the noise digital signal and the specific noise is smaller than a preset amplitude threshold value and the frequency difference is smaller than a preset frequency threshold value.
10. The active noise reduction system for outdoor ambient noise according to claim 9, characterized in that: the DSP chip is also used for judging whether a plurality of specific noises are the same as the noise sources of the current scene in the storage unit, if so, the vibration frequency information of the noise sources in the current scene is used as a reference quantity, the difference value between the vibration frequency information of each specific noise and the reference quantity is calculated, and the specific noise with the minimum difference value is output.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113160786A (en) * | 2021-03-23 | 2021-07-23 | 河南理工大学 | Fan noise reduction system and method for coal mine tunnel |
| CN115171640A (en) * | 2022-06-28 | 2022-10-11 | 科大讯飞股份有限公司 | Noise reduction robot, electric appliance noise reduction system and active noise reduction method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113160786A (en) * | 2021-03-23 | 2021-07-23 | 河南理工大学 | Fan noise reduction system and method for coal mine tunnel |
| CN115171640A (en) * | 2022-06-28 | 2022-10-11 | 科大讯飞股份有限公司 | Noise reduction robot, electric appliance noise reduction system and active noise reduction method |
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