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121 results about "Noise field" patented technology
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Active noise reduction for audiometry
InactiveUS6396930B1Maximize noise control performanceAccurate comparisonEar treatmentAudiometeringNoise controlNoise field
The technology of active noise reduction (ANR) is incorporated into audiometry testing in a variety of formats. Analog feedback, digital feedback, adaptive feedforward, and adaptive feedback noise control schemes are presented for use in audiometry to reduce the ambient noise heard by the test subject, allowing subject testing in higher ambient noise fields. Audiometer test signals are appropriately compensated so the test results are accurate and comply with existing calibration standards for audiometers. Existing audiometry headphone technologies are modified so that ANR can be accomplished while satisfying existing standards for audiometric testing. Embodiments are also defined for alternate headphone arrangements that may not conform to current (1997) audiometric testing standards but provide sufficient performance advantages to warrant new standards for audiometry testing in the future.
Owner:GENTEX CORP
Telephonic handset employing feed-forward noise cancellation
InactiveUS7031460B1Effective noise cancellationRobust against inter-user variabilityTwo-way loud-speaking telephone systemsEar treatmentNoise fieldIir filtering
A telephonic handset comprises an active noise reduction (ANR) system. The ANR system comprises a reference microphone and an IIR filter. The IIR filter is receivingly coupled to the reference microphone with respect to noise reference signals, and it is transmittingly coupled to the receiver transducing element of the handset. The ANR system is configured as a fixed feed-forward noise cancellation system. Preferably, the IIR filter has a transfer function derived, in part, from the open-loop gain of a feedback noise cancellation system.In specific embodiments of the invention, the noise reference microphone is situated so as to sample the ambient noise field near the front face of the receiver, but without directly sampling the noise field on the front face.
Owner:LUCENT TECH INC +1
Voice enhancement method employing combination of nesting-subarray-based post filtering and spectrum-subtraction
InactiveCN101447190AImprove frequency responseSimple structureSpeech analysisPost filteringFrequency response
The invention discloses a voice enhancement method employing a combination of nesting-subarray-based post filtering and spectrum-subtraction and is suitable for indoor environment, comprising the enhancement of multi-channel voice signal in vehicle environment; as the problems of unstable the broadband of the voice signals, the inconsistent frequency response of the microphone-array-based multi-channel voice-enhancement method to the voice signal and the correlation among all-channel noise in actual noise-field environment are considered, by utilizing the microphone array nested by the subarrays with different spacing, the voice signals are collected; and the voice signals formed by subarray beams are divided into a high-frequency section and a low-frequency section, different voice-enhancement algorism are adopted for carrying out the treatment; all the advantages are complementary with each other, thus improving the effect of voice enhancement.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL
Voice identification method and device
The embodiment of the invention provides a voice identification method which comprises the following steps of: acquiring voice data; acquiring a first confidence level value according to the voice data; acquiring a noise scene according to the voice data; acquiring a second confidence level value corresponding to the noise scene according to the first confidence level value; and if the second confidence level value is greater than or equal to a pre-stored confidence level threshold value, processing the voice data. The invention also discloses a device. According to the noise scene, the method and the device can be used for flexibly adjusting the confidence level value, so that the voice identification rate in the noise environment is greatly improved.
Owner:HUAWEI DEVICE CO LTD
System and method for estimating, synthesizing and matching noise in digital images and image sequences
InactiveUS7245783B2Improve textureQuality improvementImage enhancementTelevision system detailsNoise fieldCorrelation coefficient
A method for synthesizing noise in a digital image comprises the steps of (a) estimating noise statistics based on a set of spatial autocorrelation coefficients and a set of spectral correlation coefficients that correspond to the color channels of the image, where at least one of the spatial autocorrelation coefficients is weighted by at least one of the spectral correlation coefficients, thereby providing a weighted set of autocorrelation coefficients, and where a set of filter coefficients is obtained from the weighted set of autocorrelation coefficients; and (b) synthesizing a synthetic texture by using the filter coefficients to filter a random noise field in each of the color channels, thereby producing output noise fields in each of the color channels that replicate a synthetic texture, e.g., a desired grain appearance, when combined into the digital image.
Owner:INTELLECTUAL VENTURES FUND 83 LLC
Diffusor
ActiveUS8162604B2Improve acoustic propertiesIncrease widthEngine manufacturePump componentsNoise fieldImpeller
The guide device for the diffusor at the compressor impeller outlet of a radial compressor has guide blades with stepped inlet edges. The step is implemented by setting back the hub-side inlet edge. This meridional stepping divides the guide blades into two component blades, of which the first component blade is made longer than the second component blade. The set-back of the inlet edge of the hub-side component blade and the associated superposition of the noise fields which are produced on the front and rear inlet edge of the diffusor leads to improvement of the acoustic properties of the compressor.
Owner:TURBO SYST SWITZERLAND LTD
Methods and systems for enhanced accuracy image noise addition
InactiveUS20080118128A1Reconstruction from projectionCharacter and pattern recognitionPattern recognitionNoise field
Methods and apparatus for reconstructing a simulated image of an object that includes a predetermined amount of noise are provided. A method includes receiving a base image, determining an amount of noise in the base image, generating a noise field image based on the determined amount of noise in the base image, combining the noise field image and the base image to generate a simulated image that includes the predetermined amount of noise, and displaying the simulated image.
Owner:GENERAL ELECTRIC CO
Diffusor
ActiveUS20070274826A1Improve acoustic propertiesGreat useful characteristic diagram widthEngine manufacturePump componentsNoise fieldImpeller
The guide device for the diffusor at the compressor impeller outlet of a radial compressor has guide blades with stepped inlet edges. The step is implemented by setting back the hub-side inlet edge. This meridional stepping divides the guide blades into two component blades, of which the first component blade is made longer than the second component blade. The set-back of the inlet edge of the hub-side component blade and the associated superposition of the noise fields which are produced on the front and rear inlet edge of the diffusor leads to improvement of the acoustic properties of the compressor.
Owner:TURBO SYST SWITZERLAND LTD
Line spectrum detection method by coherent accumulation of frequency domains
InactiveCN102353952AEasy to detectImprove signal detection performanceWave based measurement systemsNoise fieldTime correlation
The invention provides a line spectrum detection method by coherent accumulation of frequency domains. According to the invention, the method comprises the following steps that: step one, on the basis of time correlation characteristics of a signal field and a noise field, segment processing is carried out on a receiving signal, so that there are time delays between all segments of the signal and a time delay amount is greater than a correlation radius of the noise and is less than a correlation radius of the signal; step two, each the signal segment is internally divided into a plurality of sub data segments and it is allowed that there are overlapping parts of data of all the segments; step three, time delay compensation is carried out on the signal; step four, signals of all the segments are accumulated to obtain an output signal of coherent accumulation; step five, power equalization is carried out on outputs of all correlation accumulations, so that a power spectrum estimated by the method provided in the invention is obtained. According to the invention, coherence of signals is utilized; and phase compensation is carried out on signals, wherein there are time delay differences between all the signals; therefore, same phase addition of the signals is formed; however, because the phase of the noise is random, there is no formed same phase addition for the noise, so that a detection capability on a weak signal can be improved.
Owner:HARBIN ENG UNIV
Submarine sound velocity passive access method based on noise field vertical vibration velocity signal
The invention relates to a submarine sound velocity passive access method based on a noise field vertical vibration velocity signal. The method comprises the steps that a marine environment noise field vector signal vertical coherent characteristic prediction model is built, aiming at three elements of inversion, an optimization algorithm, forward modeling and a cost function, a submarine sound velocity inversion model based on noise field vertical vibration velocity signal vertical coherent characteristics is given, and noise field vertical coherent characteristics are selected for conductinginversion of the submarine sound velocity. Accordingly, seawater acoustic parameters can be obtained through actual measurement, by means of a submarine geological database, geology types of the experimental seafloor can be obtained roughly, the search range of submarine parameters can be determined through table look-up, by means of a genetic algorithm, the best agreement of noise field verticalcoherent characteristic results and measured results under a group of ground acoustic parameters, and the parameters can be approximatively considered as actual submarine earth sound parameters.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Method and device for compensating for magnetic noise fields in spatial volumes, and nuclear magnetic resonance imaging apparatus
InactiveUS6844732B2Improve performanceLow costMeasurements using NMR imaging systemsElectric/magnetic detectionNoise fieldNMR - Nuclear magnetic resonance
A method for compensating for magnetic noise fields in spatial volumes includes determining the strength of a magnetic field outside said spatial volume; defining the correlation between the noise field outside the spatial volume and the corresponding noise field inside said spatial volume; generating a magnetic compensation field for neutralizing the noise field in said spatial volume. The method further provides separate detection of noise fields with frequencies in the range of at least two different frequency bands.
Owner:ESAOTE
Electronic device, method and computer program for active noise control inside a vehicle
A device for active noise control inside a vehicle, the device comprising a processor (7610) configured to determine a noise wavefield within the vehicle based on noise signals captured by a microphone array (M1-M10); determine the position of the ears of a passenger (P1) based on information obtained from a head tracking sensor (HTU1); capture a noise field inside the vehicle based on information obtained by the microphone array; obtain a noise level at the ears of the passenger (P1) from the noise field; and determine an anti-noise field based on the noise level at the position of the ears of the passenger.
Owner:SONY CORP
Substation noise source distribution measuring method based on synthetic aperture principle
ActiveCN103217211AGood effectHigh measurement accuracySubsonic/sonic/ultrasonic wave measurementUsing electrical meansSound sourcesMeasurement precision
The invention discloses a substation noise source distribution measuring method based on a synthetic aperture principle. The method comprises the following steps of adopting an array to sample substation radiation noise fields in different space positions, wherein the array consists of one group of microphones with fixed relative positions; meanwhile, fixing a plurality of reference microphones to sample the substation radiation noise fields; and then, utilizing a data processing method to synthesize the noise fields, which are sampled in different space positions by the array consisting of the microphones, through signals sampled by the reference microphones, so as to measure the substation low-frequency noise source distribution. The method is based on an array technique, and the higher angle resolution can be obtained. When one sound source is measured, the other sound sources can be effectively shielded, and the measuring precision is higher. The method has the advantage that the characteristic of the substation noise being a stable single-frequency signal is utilized, and by using the reference microphones, the small-aperture arrays in different positions are synthesized into a virtual large-aperture array, so the problem of measurement of the low-frequency noise source is effectively solved.
Owner:STATE GRID CORP OF CHINA +2
Seabed sound speed multi-step inverting method based on dual-vector hydrophone
ActiveCN109489799AGuaranteed accuracyReduce dimensionalityWave based measurement systemsVelocity propogationHydrophoneVertical vibration
The invention relates to a seabed sound speed multi-step inverting method based on a dual-vector hydrophone. The method includes the steps of reestablishing a sound field green function between two points in the vertical direction through noise field vertical vibration velocity signals and extracting different multiplicity arrival structures to obtain the seabed layered structure and the relationbetween the sound speed and the thickness of each depositing layer, selecting a corresponding seabed model, and inverting the seabed sound speed through the vertical coherence characteristic of the noise field vertical vibration velocity signals. By means of the multi-step inverting method, it can be ensured that the selected seabed model is correct during inverting, and the guarantee is providedfor the accuracy of the inverting result. In addition, by means of the multi-step inverting method, the sound speed and the thickness of the seabed depositing layer can be represented with an inverting amount, the dimension of the parameter search space during inverting is reduced, and the inverting efficiency is improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Underpan structure of wind cooling electric generating set
ActiveCN101158314ADirectionalGuaranteed stabilityPortable framesMachines/enginesNoise fieldDirectivity
The invention relates to a chassis structure of a wind cooling generator unit. The invention is characterized in that the front end F of the chassis is provided with a wind inlet; a main wind duct is horizontally arranged in the wind inlet; the end of the main wind duct is provided with a clapboard which hermetically comparts the main wind duct and an wind outlet; the rear end of the chassis is provided with the wind outlet, with the exhaust direction pointing to a oblique lower part; the main wind duct is respectively provided with a first wind distributing port, a second wind distributing port and a third wind distributing port which are communicated in a casing assembly; one end of a wind guide duct is communicated with the first wind distributing port and the other end of the wind guide port is communicated with the outlet of the wind guide duct. The invention sufficiently utilizes the absorption and dispersion function of the ground to the noise, causes the noise field with strong directivity outwards radiated by the wind outlet of the generator unit to be attenuated and weakened and the noise of the whole machine is reduced; the arrangement of a plurality of wind distributing ports can ensure that all parts in the generator unit casing can be suitably cooled, the service life of corresponding parts can be prolonged, and the stability of the unit in long-term operation can be ensured.
Owner:WUXI KIPOR POWER CO LTD
Desert seismic exploration random noise eliminating method based on noise modeling analysis
InactiveCN109991664AAccurate and reliable prior knowledgeFit closelySeismic signal processingPattern recognitionNoise field
The invention relates to a desert seismic exploration random noise eliminating method based on noise modeling analysis, and belongs to the technical field of physical geography. The desert seismic exploration random noise eliminating method comprises the following steps: building a noise-containing synthetic record; building desert seismic exploration random noise model; taking a natural noise function, a near-field human noise function, and a far-field human noise function as excitation functions of the wave function; solving a wave equation with a green function to obtain a noise field of the natural noise, a noise field of a near-field human noise and a noise field of a far-field human noise; overlapping the noise field of the natural noise, the noise field of the near-field human noiseand the noise field of the far-field human noise to obtain a desert area random noise model; and determining a proper filtering method for filtering and denoising by using the random noise model. Through adoption of the desert seismic exploration random noise eliminating method, a shearlet variable threshold denoising method finally determined based on the noise modeling is suitable for eliminating the desert seismic exploration noise; the signal-to-noise ratio of the seismic exploration data is improved; the effective signal can be recovered accurately; and the interpretation of subsequent seismic data is effectively facilitated.
Owner:JILIN UNIV
Voice increasing method, system and device and storage medium
PendingCN111599371AReduce computational overheadAccurately identify tasksSpeech analysisHigh level techniquesNoise fieldNoise
The invention relates to a voice signal processing method, in particular to a voice enhancement method, which comprises the following steps of S10, audio acquisition, S20, screening effective voice signals, S30, preliminarily enhancing the voice, S40, screening target voice, S50, enhancing the voice signal again, S60, carrying out wake-up word detection: sending the re-enhanced voice into a high-precision wake-up word detection model, carrying out wake-up word detection, and entering S70 when a wake-up word is detected, and otherwise, returning to S20, and S70, continuously enhancing the voicedetected by the wake-up word, then sending the enhanced voice to a recognition end and carrying out recognition. According to the speech enhancement method provided by the invention, the calculationoverhead can be effectively reduced, and the recognition task can be accurately carried out even in a strong noise scene. The method is suitable for being applied to a local end with complex environment and limited computing resources.
Owner:苏州奇梦者科技有限公司
Combined secondary sound source design method applied to active noise control
InactiveCN101389158ASimple structureImprove noise reductionElectrical apparatusNoise controlSound sources
The invention relates to a combined secondary sound source design method applied to active noise control, which comprises measuring central frequency f0 in energy centralized frequency band of the primary noise field, and space distribution characteristic of the primary sound field; setting number of combined secondary sound source between 4 and 8; setting distance between the secondary sound source to the center of the primary noise center as not exceeding 0.5 times of wavelength corresponding to sound source central frequency; forming the secondary sound source by two loudspeaker units closely abutting against each other, having a secondary channel shared thereby; computing source strength ratio an, 12, (n=1, 2, ..., N) of the loudspeaker close to the primary source and the loudspeaker remote to the primary source respectively according to distribution characteristic of the primary noise field and space position of the secondary sound source; and selecting two loudspeaker units having frequency response close to each other as unit 1 and unit 2 in the combined secondary sound source to form the combined secondary sound source according to source strength amplitude ratio of the secondary sound source. The method evidently enhances noise reducing performance, and the combined source is simple in construction, suitable for multiple kinds of sound field environment.
Owner:NANJING UNIV
Time-space array differential electromagnetic prospecting method
ActiveCN105445805AFlexible collection methodElectric/magnetic detectionAcoustic wave reradiationMatrix decompositionNoise field
Owner:CENT SOUTH UNIV
Engine noise test method
ActiveCN103994819AGuaranteed accuracyReduce in quantitySubsonic/sonic/ultrasonic wave measurementUsing electrical meansJet aeroplaneNoise field
The invention belongs to the field of airplane vibration and noise, and relates to an engine noise test technology. The engine noise test technology comprises measuring point optimization arrangement, multichannel data simultaneous acquisition and cloud method data post processing. The measuring point optimization arrangement enables important noise information of an engine noise field to be captured by use of quite few microphones; the multichannel data simultaneous acquisition ensures the accuracy of acquisition data; and the cloud method data post processing can enable the noise distribution of a tail jet flow field to be obtained more visually. The engine noise test technology has the following advantages: the test precision is high, the test result is visual, the multichannel simultaneous acquisition reduces the frequency of starting an engine during testing, and the test cost is saved.
Owner:SHENYANG AIRCRAFT DESIGN INST AVIATION IND CORP OF CHINA
Double layer ring microphone array voice enhancement method
ActiveCN108447499AImprove robustnessHigh directivity factorSpeech analysisNoise fieldComputer science
The invention discloses a double layer ring microphone array voice enhancement method. Different beam forming methods are used according different sound field environments so that the noise robustnessof the microphone array can be enhanced. When the sound field environment is the scattering noise field, the method of combination of first-order and second-order differential beam former items is used at different bands to perform voice enhancement and the high directivity factor can be acquired without sacrificing the white noise gain.
Owner:FOSHAN SHUNDE SUN YAT SEN UNIV RES INST +2
Method and probe for compensating for magnetic noise fields in space volumes, particularly in magnetic resonance imaging apparatus
A method for compensating in a space volume for a magnetic noise field outside the space volume includes determining a strength of the magnetic noise field outside the space volume; defining a correlation between the noise field outside the space volume and a corresponding noise field inside the space volume, or calculating the noise field inside the space volume on the basis of the measurements of the magnetic field outside the space volume; based on the noise field inside the space volume, generating a magnetic compensation field for neutralizing the noise field inside the space volume; wherein the compensation of the magnetic noise field outside the space volume is carried out along a direction in the space volume which is variable by determining a noise field component inside the space volume along the direction and generating a compensation field of the noise field component along the direction.
Owner:ESAOTE
Acoustic vector sensor amplitude weight MUSIC direction finding method
ActiveCN108469599ACompensation inconsistencyImprove estimation accuracyDirection finders using ultrasonic/sonic/infrasonic wavesSignal-to-quantization-noise ratioSound pressure
The invention discloses an acoustic vector sensor amplitude weight MUSIC direction finding method, belongs to the sensor signal processing technical field, and specifically relates to a method that uses a single acoustic vector sensor to carry out target direction finding in a sea environment noise field; the method is realized via an acoustic vector sensor; the acoustic vector sensor comprises asound pressure sensor and three vibration velocity sensor in a space common point mode, and can simultaneously measure the sound pressure and three vibration velocity components in x, y and z directions. The method combines to consider target angle and sound pressure channel and vibration velocity channel ambient noise powers, compensates the sound pressure and vibration velocity channel ambient noise power non-consistency, thus ensuring high estimation precision and resolution under a low signal to noise ratio condition; the method can solve the problems that an existing MUSIC direction finding technology is high in sidelobe and fat in main lobe, and cannot distinguish two targets in the sea environment noise field; the method can be applied to solve the passive direction finding problemsof a weak target and dual-target in the sea environment noise field.
Owner:HARBIN ENG UNIV
Active noise reduction method for spatial field
PendingCN108877758AImprove noise reductionReduce noise levelSound producing devicesNoise fieldNoise level
According to the invention, the surrounding noise distribution and change features of all points are collected so as to simulate and build a whole noise sound field model shown in the description, wherein the noise field sound model is a group of continuous functions in a three-dimensional space and comprises the sound features of each frequency. The method comprises the steps: calculating the coefficients of basis functions of the noise sound field model; constructing a model of one noise reduction sound model according to the current controller parameters, carrying out the preliminary noisereduction with the noise sound field, and then calculating the energy of the whole space according to the collected noise sound field model. The coefficients of basis functions of the noise sound field model are combined for designing the controller parameters under the condition that the overall energy is minimum, and then the sound field model counteracting the noise sound field is constructed according to the model, so as to achieve the precise noise reduction, thereby enabling the noise reduction effect of the system to be optimal. In other words, the method achieves the noise reduction ata position that the noise reduction is most required, so as to achieve the optimal noise reduction effect of the whole space, and reduce the noise level of the space.
Owner:北京安声科技有限公司
Array detection and estimation method of environmental noise field intensity and distribution
ActiveCN103344319ASubsonic/sonic/ultrasonic wave measurementUsing electrical meansEnvironmental noiseSensor array
The invention provides an array detection and estimation method of environmental noise field intensity and distribution. According to the method, an electret microphone is arranged in an array mode, packaging of the specific structure and the specific materials is adopted by the array of the electret microphone to form a ball coronary sound sensor array, each electret microphone sound hole corresponds to through holes in a packaging outer shell, and multi-hole metal composite structural material interval fillings is adopted by the through holes in the packaging outer shell. Each electret microphone signal of the not-filled through holes in the packaging outer shell and each electret microphone signal adjacent to the electret microphone after the through holes in the packaging outer shell are filled are collected according to itineration and synchronization modes, power spectrum estimation is carried out on noise intensity after low-frequency background noise is restrained, and finally an environmental noise field intensity and distribution model is built. The technical problems that when high-frequency noise is measured, the sensitivity is low, and noise distribution and field intensity are hard to determine are solved.
Owner:XIAN FEISIDA AUTOMATION ENG
Laboratory playback device and method of actual noise field
ActiveCN102685658AEfficient measurementObjective Noise Cancellation PerformanceTransducer circuitsNoise fieldComputer science
The invention relates to a laboratory playback device and method of an actual noise field. The front end of the laboratory playback device is respectively connected with a computer and a horn; a computer sends noise through the horn or the noise is acquired and then sent to a processing component in the computer for carrying out calibration, test and the like. The laboratory playback device and method solve the defects that noise is not definite in directivity and enough in scattering property, is static and insufficient in coverage surface and the like in the past. According to the invention, noise playback can effectively cover the actual noise field of a communication terminal using environment from a point noise source with definite directivity to nondirectional scattering noise, thereby providing a noise environment with effective, objective and accurate communication terminal denoising performance measurement, ensuring that playback of the laboratory noise field is accurately consistent with that of the actual noise filed, accurately measuring the denoising performance of the communication terminal and ensuring accurate, effective and objective results.
Owner:深圳市爱普泰科电子有限公司
Engine air inlet noise sound power test system and test method thereof
The invention provides a test system of measuring engine air inlet noise sound power and a method thereof. In the invention, assembling of an installation support and a sound intensity probe is specially designed. The test system is constructed, and a scientific sound intensity and sound power algorithm is used to process a test signal. Through using a characteristic that a sound intensity vector carries out integral along a closed curved surface, an engine air inlet noise is completely isolated and extracted from an integral and complex noise field of an engine mathematically so as to be served as a reliable basis of evaluating the engine air inlet noise. Compared to sound power measurement by using an existing traditional sound pressure method, by using the method in the invention, a test result is irrelevant with a peripheral sound field, which means that there is no requirement to a sound field test environment and the test does not need to be performed in a specific acoustic environment, such as an anechoic chamber and a live room. Based on a mathematics principle, a characteristic of an air inlet noise source can be extracted from the complex engine noise field. Tool equipment, such as a big barrier board, an air inlet extension tube and the like, does not need to be designed and made.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD
Method for background noise removal by electromagnetic measuring technology
InactiveCN103207322AReliable evaluationAccurate measurementElectromagentic field characteristicsNoise fieldElectromagnetic radiation
The invention particularly relates to a method for background noise removal by an electromagnetic measuring technology. The method belongs to the technical field of the electromagnetic environment detection and comprises synchronously performing electromagnetic radiation field intensity detection on different detection points along the same direction of radiation source through a detection system which is formed by three same detecting devices; measuring comprehensive field intensity of electromagnetic radiation field intensity and noise field intensity; utilizing a data processing program of the detection system to obtain noise field intensity; and calculating electromagnetic radiation field intensity after noise is eliminated. Accordingly, the method for the background noise removal by the electromagnetic measuring technology has the advantages of enabling measuring results to be accurate and guaranteeing accurate and reliable electromagnetic radiation environmental assessments.
Owner:ZHENGZHOU UNIV
Noise reduction method of earphone, self-adaptive FIR filter, denoising filter bank and earphone
ActiveCN111193977AEnhanced inhibitory effectEarpiece/earphone noise reductionEnvironmental noiseNoise field
The invention relates to a noise reduction method of an earphone, a self-adaptive FIR filter, a denoising filter bank and the earphone. The noise reduction method comprises the following steps: acquiring an external environment noise signal; filtering by using a first infinite impulse response (IIR) filter based on the external environment noise signal to obtain a first noise reference signal so as to counteract the effects of the external microphone and the loudspeaker; collecting a residual noise signal, and adjusting a coefficient of a first finite impulse response (FIR) filter based on theresidual noise signal and the first noise reference signal; filtering the first noise reference signal using a first FIR filter, and outputting an in-ear reverse noise via a speaker to cancel the in-ear reverse noise over the air from the noise entering the ear. According to the method, the filter coefficient of the FIR filter can be adaptively adjusted according to any one of the earphone wearing posture, the ear structure and the noise scene change, and under the conditions that adaptive rapid convergence is achieved and the order of the FIR filter is low, a good suppression effect on noiseunder different conditions is achieved.
Owner:BESTECHNIC SHANGHAI CO LTD
Vector microphone array-based low-frequency noise source high-precision positioning method
InactiveCN108562871AComplete sound field informationReduce the numberPosition fixationBroadband noiseReference vector
The invention provides a vector microphone array-based low-frequency noise source high-precision positioning method. The vector microphone array-based low-frequency noise source high-precision positioning method is accurate in sound field distribution and noise source position measurement, and is particularly suitable for positioning a transformer substation low-frequency noise source under the near field condition. According to the vector microphone array-based low-frequency noise source high-precision positioning method, broadband noise signals are acquired in different positions of the noise environment space of the transformer substation by the vector microphone array; moreover, one reference vector microphone is fixed to continuously sample noise fields in the selected position, the signal acquired by the array and the signal acquired by the reference vector microphone are subjected to phase calibration in a frequency domain, and data is equivalent to the signal acquired by a large array at the corresponding time, so that large array pore diameter is synthesized and high-precision positioning of the low-frequency noise source is realized.
Owner:STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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