34results about "Diversity direction finding" patented technology

The invention belongs to the acoustic vector communication field, and particularly relates to a vector circular matrix steady broadband MVDR estimation method. The method comprises steps of performing sub-band decomposition on acoustic pressure data and vibration velocity data received by the two-dimension circular array and generating a broadband frequency domain signal matrixes of the acoustic pressure and vibration velocity to obtain a broadband frequency domain snapshot data matrix of the vector matrix, generating vector cross-spectral matrix on all sub-bands, setting pace lengths, performing azimuth scanning, constructing a vector array guide vector on the sub-band, selecting a focusing reference frequency point and constructing the vector array focusing guide vectors on the same azimuth, adopting a coherence signal subspace CSS focusing transformation method to obtain a vector array focusing transformation matrix, obtaining a broadband focusing covariance matrix, obtaining an optimum vector and array average output power after optimization, and determining sound wave source according to the spectrum peak position of the spatial spectrum. The Acoustic vector circular matrix steady broadband MVDR orientation estimation method applies stable constrained optimization and improves the spatial spectrum resolution.

The invention discloses an unmanned aerial vehicle direction estimation method based on voiceprint multiharmonic identification. For a traditional incoherent subspace direction-of-arrival estimation algorithm of a high resolution spectrum, a wide-band signal is divided into several narrow-band signals, angle estimation is performed on a narrow band through a multiple signal classification (MUSIC) algorithm, and an arithmetic mean is obtained. The traditional method ignores uneven energy of sub-bands and different signal-to-noise ratios, and then the algorithm performance is poor. According to the method, characteristic frequency is obtained by performing time-frequency analysis on an acoustical signal of a target information source. For the wide-band signal, only the sub-band where the characteristic frequency is located is extracted, narrow-band MUSIC operation is performed, the energy ratios and the signal-to-noise ratios of all characteristic sub-bands are combined, different weighting coefficients are given to all characteristic sub-band direction angles, the angle estimation result is obtained through weighted mean, and then more accurate angle estimation performance is achieved.

The present invention provides an acoustic vector circular array mode-domain robust direction estimation method. The method includes the following steps that: the received signals P(t), Vx (t) and Vy (t) of an acoustic vector circular array acoustic pressure channel, an acoustic vector circular array vibration velocity x channel and an acoustic vector circular array vibration velocity y channel are obtained; the received signals Pe (t), Vex (t) and Vey(t) of a phase mode-domain acoustic pressure channel, a phase mode-domain vibration velocity x channel and a phase mode-domain vibration velocity y channel are obtained; Vex (t) and Vey(t) are rotated electronically, so that a combined vibration velocity Vec (t) can be obtained, a covariance matrix Repv is obtained based on Pe (t) and Vec (t), an unitary matrix Q is introduced to transform the matrix Repv, so that a real-value covariance matrix Rpv of mode-domain acoustic pressure and vibration velocity combined processing can be obtained; a steering vector a<~>r(Phi<~>) which has been subjected to mode-domain transformation and real-value processing is constrained, second-order cone programming is adopted to carry out solving, so that an optimal weight vector Omegarob can be obtained; and an output space spectrogram can be obtained based on the steering vector Omegarob which has been subjected to mode-domain transformation and unitary matrix real-value transformation, and a target direction can be obtained based on a spectrum peak position. With the method of the invention adopted, the problems of performance degradation and high signal-to-noise ratio processing threshold of a minimum variance distortionless response algorithm under a condition that related sound sources are difficult to distinguish and mismatching occurs can be solved. The method has the advantages of high resolution, high robustness, small amount of calculation, strong background noise suppression ability and the like.

The invention discloses a two-stage MUSIC microphone array direction finding method. The method includes the steps that a microphone array which is composed of N array elements receives spatial far field sound source signals, and sampled data of the microphone array are acquired; the sampled data are segmented to acquire segmented microphone array data; frequency domain segmented array data are acquired; available frequency units are selected, so that an available frequency set is obtained; the reference frequency is determined when the angle of arrival is estimated; the two-stage MUSIC algorithm is used for calculating the angle of incidence of the sound source signals. According to the method, the advantages of the frequency units at different frequency bands in the angle estimating process are combined, the frequency unit which is closest to the reference frequency is selected to be subjected to two-stage MUSIC spectrum estimation at most, the frequency units at the high frequency stage are used for guaranteeing the angle estimating precision, the frequency units at the low frequency stage are used for solving the angle estimating blur, the angle estimating result at the low frequency stage is used for solving the angle blur at the high frequency stage, and therefore a high-precision angle estimating result can be acquired.

An acoustic array near-field source ESPRIT and MUSIC parameter estimation method is provided. An array receives K uncorrelated narrowband random steady near-field sound source signals with different frequencies. Two groups of received signals ahead and after a delay tap and received by the array form full array received signals. A signal data autocorrelation matrix is subjected to characteristic decomposition to obtain the estimated values of an array steering vector matrix and the frequency. A rotation-invariant relation between four sub array steering vectors is obtained from the estimated value of the array steering vector. The rough estimated values of a signal azimuth angle, a pitch angle, and a distance are obtained according to a rotation-invariant relation matrix. A MUSIC spectrum peak search method is used to obtain the accurate estimated values of the azimuth angle, the pitch angle and the distance in a small area near the rough estimated values. The method breaks through the limitation of a conventional linear array parameter estimation method and the super large calculated amount of the full-domain 3D search of a single MUSIC method, combines the advantages of the ESPRIT method and the MUSIC method, requires no parameter matching operation, greatly reduces the calculated amount and improves parameter estimation accuracy.

The invention discloses a voice directing method and system based on intelligent equipment. The method comprises that after that the intelligent equipment is started, a voice signal is obtained in real time; when the voice signal is detected by the intelligent equipment, a present foreground image of the intelligent equipment is obtained, and a candidate direction of a sound source is obtained according to the present foreground image; and according to the candidate direction of a sound source, the intelligent equipment carries out calculation via a positioning algorithm, and then determines a sound source direction of the voice signal according to a calculation result. According to the invention, the candidate direction of the voice signal obtained in advance is calculated by combining image collection, the candidate direction is checked via the algorithm, the optimal sound source direction is obtained, the computing complexity is reduced, and the positioning efficiency of the voice signal is improved.

Iterative methods for direction of arrival estimation of a signal at a receiver with a plurality of spatially separated sensor elements are described. A quantized estimate of the angle of arrival is obtained from a compressive sensing solution of a set of equations. The estimate is refined in a subsequent iteration by a computed error based a quantized estimate of the direction of arrival in relation to quantization points offset from the quantization points for the first quantized estimate of the angle of arrival. The iterations converge on an estimated direction of arrival.

The invention provides an acoustic vector sensor two-dimensional array MUSIC decoherence parameter estimation method. An array receives K far-field narrowband coherent signals, and N times of snapshot data outputted by all the array elements are acquired by using the receiving array; four subarray data of acoustic pressure and x-axis, y-axis and z-axis acoustic velocity are extracted, and a data covariance matrix after decoherence is constructed by a data covariance matrix before transformation, a covariance matrix after data transformation and a cross-covariance matrix before and after transformation; singular value decomposition is performed on the data covariance matrix after decoherence so as to obtain a noise subspace, the noise subspace is divided into x-axis and y-axis noise subspaces according to the characteristics of an L-shaped array and the corresponding MUSIC space spectrum is constructed, and direction cosine estimation matrixes are obtained by two one-dimensional searches; and matching operation is performed on the direction cosine estimation values of the x-axis and y-axis directions by using the noise subspaces corresponding to the full array so as to achieve the estimation value of the angle of arrival. According to the method, one two-dimensional search is divided into two one-dimensional searches so that the computational burden can be greatly reduced and the parameter estimation accuracy can be enhanced.

The invention provides an acoustic vector sensor array space rotation solution coherence arrival angle estimation method. An array receives K coherence narrowbands and a stationary far-field signal. The single-shot snapshot output data of all elements are acquired through a receiving array. N-times snapshot data of the array are measured. The orthogonal vector characteristic of an acoustic vector sensor is fully used. The acoustic vector sensor array is divided into four sub-arrays of an acoustic pressure sub-array, an x-axis vibration velocity sub-array, a y-axis vibration velocity sub-array and a z-axis vibration velocity sub-array. The signal covariance matrix rank is acquired through sub-array processing, so as to acquire a data covariance matrix after solution coherence. A noise space is acquired through the data covariance matrix after solution coherence. A noise subspace is used to construct a MUSIC spatial spectrum. The estimated value of an arrival angle is acquired by searching the one-dimensional MUSIC peak of an angular domain. Compared with a spatial smooth de-coherence method, the method provided by the invention is applicable to a uniform linear array and a non-uniform linear array, is free of aperture loss, and has the advantages of higher spatial resolution, orientation accuracy and wide application range.

The invention provides a stochastic resonance enhanced acoustic vector signal orientation method. The method can realize amplitude linear gain and is suitable for vector acoustic signal noise reduction processing in orientation, can solve the problem of large vector acoustic orientation error under the condition of low signal-to-noise ratio, and has good orientation effect. The stochastic resonance enhanced acoustic vector signal orientation method is mainly applied to the orientation of an underwater weak target in a low signal-to-noise ratio environment, has good resistance to phase inconsistency of actual vector acoustic signals, and is a stable single-vector hydrophone orientation method.

A method for providing sound detection information producing a result of sound detection based on sound data generated by detecting sound generated around a host vehicle, may include determining an opposite lane vehicle detection index based on the result of sound detection, the opposite lane vehicle detection index forming a basis of determination of presence or absence of an opposite lane vehicle, and controlling a notification of a neighboring vehicle travelling around the host vehicle or controlling the host vehicle according to the opposite lane vehicle detection index, wherein the result of sound detection is information about the probability of presence of the neighboring vehicle for respective angles in frames consecutive over time.

A speech interaction device includes an ascertaining section and a control section. The ascertaining section ascertains a direction of a speech utterer by audio emitted by the speech utterer. The control section controls directionality of audio output through a speaker when outputting audio toward the speech utterer, such that directionality of audio in the direction ascertained by the ascertaining section is higher than directionality of audio in other directions.

The invention relates to a hydrophone direction finding method, a hydrophone direction finding device, a computer readable storage medium and computer equipment. The hydrophone direction finding method comprises the steps of: firstly, acquiring various paths of hydroacoustic signals output by a directional hydrophone array; subjecting the various paths of hydroacoustic signals to discrete Fourieroperation separately, so as to obtain each path of hydroacoustic energy spectrum corresponding to each path of hydroacoustic signal; and acquiring an azimuth value of direction finding at present according to various paths of the hydroacoustic energy spectra, wherein directivity of the directional hydrophone array covers a 360-degree hydroacoustic singal measurement range. The hydrophone directionfinding method and the hydrophone direction finding device can acquire various paths of hydroacoustic signals covering the 360-degree measurement range by means of the hydrophone array, so that the acquired hydroacoustic singal measurement range is complete without omission, the azimuth value of direction finding at present is obtained by adopting a method of acquiring the energy spectra, the anti-reverberation capability is high, and the hydrophone direction finding method and the hydrophone direction finding device are suitable for the complex underwater environments with reverberation andmultipath.

The invention relates to the technical field of array signal processing, and discloses a method for estimating the direction of arrival of an acoustic vector sensor array under non-uniform noise, and the method comprises the following steps: 1, receiving an output vector X output by the acoustic vector sensor array; step 2, based on a sparse signal model, calculating a signal covariance matrix P and a noise covariance matrix Q according to the output vector X, and constructing a sparse covariance matrix R by using the obtained signal covariance matrix P and noise covariance matrix Q; 3, constructing a cost function based on the sparse covariance matrix R, estimating sparse signal power by using the cost function, and obtaining a signal power vector; and 4, carrying out spectrum peak search on the signal power vector, wherein the sound source position corresponding to the obtained spectrum peak is the estimated target azimuth angle. According to the method, the orientation estimation performance of the acoustic vector sensor array under the non-uniform noise can be improved.

A system includes at least one processor and at least one memory storing program instructions that, when executed by the at least one processor, cause the system to send an acoustic ranging transmitter signal between a plurality of calibration reference positions and at least one anchor point, receive an acoustic ranging receiver signal associated with the acoustic ranging transmitter signal and with distances between the plurality of calibration reference positions and the at least one anchor point, and estimate a speed of sound based on the acoustic ranging receiver signal.

A method for providing sound tracking information includes detecting a sound occurred adjacent to a subject vehicle to generate a sound tracking result based at least on a sound data regarding detected sound; determining an angle of point having the maximum probability among at least one of peak points in the sound tracking result as a first vehicle angle; determining whether an angle of candidate point is a second vehicle angle, wherein the candidate point has the maximum probability among peak points included in a detection range except for the first vehicle angle; and generating at least one detection signal corresponding to the first and the second vehicle angles, when the angle of candidate point is the second vehicle angle, wherein the sound tracking result includes a probability of whether there is at least one another vehicle at each of angles in each of frames continued according to time.

The invention discloses a band channel calibration particle swarm optimization broadband beam forming method and device. The method comprises the following steps: calculating a compensation coefficient of an adaptive calibration compensation filter corresponding to each microphone array element channel; determining a frequency band range in which a user is interested and a main lobe and a side lobe of an array beam in the frequency band range; calculating an input spectrum power autocorrelation matrix in the frequency band range in which the user is interested, and constructing a problem of solving an optimal FIR filter weight coefficient under a linear constraint minimum variance criterion; converting the problem into an unconstrained optimization problem, and solving by using a particle swarm optimization algorithm to obtain the optimal FIR filter weight coefficient; summing the digital signal after filtering compensation by using the optimal FIR filter weight coefficient, and outputting a time domain signal after beam forming; and if a target sound source incoming wave direction or side lobe constraint, interference and noise suppression requirements to which the wave beam points are changed, recalculating the FIR filter weight coefficient.