11results about "Systems with adjusting phase/time-lag-errors" patented technology

The invention provides a DOA estimation and error correction method and device based on joint sparse recovery, and the method comprises the steps: receiving a target signal through a linear array, building an array signal model fusing a phase error, and constructing an optimization model based on multiple measurement vectors; and compensating the phase error in each step of iteration by using an iterative optimization solution algorithm to enable the DOA to gradually approach a true value, thereby obtaining estimation results of the spatial spectrum and the phase error. The method provided by the invention has the advantages that random phase errors caused by array element position errors, system frequency errors, sound wave propagation errors and the like in DOA estimation are corrected. Under the condition that phase errors exist, a signal model and an optimization problem are constructed, and the phase errors and a DOA estimation value are solved through an iterative algorithm, so that a high-precision and low-sidelobe DOA estimation result is obtained. The method is suitable for DOA estimation under the conditions of small snapshots, strong noise and random phase errors.

The invention relates to the technical field of motion capture and space positioning, in particular to an acoustic motion capture method and system based on a receiving end synchronization mechanism. The core innovation of the method lies in that a system structure with a receiving end as a unified time reference is constructed, and asynchronous errors of a traditional transmitting end synchronization architecture are thoroughly eliminated. In order to solve the problems that signals of multiple transmitting nodes are difficult to judge at the same moment, multi-source signals are aliasing and the like, a receiving end synchronous unified time calibration mechanism is adopted, and a mixed signal scheduling scheme combining packet time division multiplexing and intra-group code division multiplexing is adopted. The system comprises a coordinator, an ultrasonic transmitting terminal, an acoustic receiving array and the like, the coordinator provides a global clock through an IEEE 1588v2 protocol and a PPS signal, the transmitting terminal transmits an ultrasonic signal with a unique pseudo-random noise code, the receiving array separates the signal through parallel matched filtering and records an accurate timestamp, and the acoustic receiving array receives the signal through the IEEE 1588v2 protocol and the PPS signal. And finally, high-precision positioning and attitude restoration are realized through a time difference of arrival algorithm, environmental parameter correction and an inverse kinematics model.

Methods and systems for spatial filtering transmitters and receivers capable of simultaneous communication with one or more receivers and transmitters, respectively, the receivers capable of outputting source directions to humans or devices. The methods and systems use spherical wave field partial wave expansion (PWE) models for transmitted and received fields at antennas and for waves generated by contributing sources. The source PWE models have expansion coefficients expressed as functions of directional coordinates of the sources. For spatial filtering receivers a processor uses the output signals from at least one sensor outputting signals consistent with Nyquist criteria representative of the wave field and the source PWE model to determines directional coordinates of sources (wherein the number of floating point operations are reduced) and outputs the directional coordinates and communications to a reporter configured for reporting information to humans. For spatial filtering transmitters a processor uses known receiver directions and source partial wave expansions to generate signals for transducers producing a composite total wave field conveying communications to the specified receivers. The methods and communications reduce the processing required for transmitting and receiving spatially filtered communications.

The application discloses a typhoon direction estimation method and system based on a single vector hydrophone and a terminal, and relates to the field of typhoon direction estimation.The method comprises the following steps: strictly checking sound pressure and three-directional vibration velocity data collected by the single vector hydrophone to ensure data quality; then, pre-processing the data, including filtering to remove noise interference; then, normalizing the filtered data; then, calculating sound intensity in each direction within a certain azimuth and pitch search range, constructing a sound intensity matrix, and finding the azimuth and pitch corresponding to the maximum sound intensity as the real reference value; dividing the processed data into a training set and a test set according to a certain proportion; constructing a multilayer perception machine model; and through experiments of different learning rates and small batch sizes, optimizing the model, selecting the parameters with the minimum loss to train the best model; finally, using the trained model to predict the test set to obtain the estimated value of the typhoon azimuth and pitch angle.The application effectively improves the accuracy of typhoon direction estimation.

The invention discloses a sound source localization method based on an NV-SRP neural network model, and relates to the technical field of sound source localization, and the sound source localization method based on the NV-SRP neural network model mainly comprises the steps: constructing a training and testing data set according to an acoustic vector sensor signal receiving model and an SRP-PHAT algorithm, and training the sound source localization network to obtain a trained sound source localization network, and predicting target sound source localization to obtain a prediction result. By implementing the sound source localization method based on the NV-SRP neural network model provided by the invention, the sound source localization precision and stability can be improved.

This invention belongs to the field of hydrophone parameter measurement technology, specifically relating to a device and method for precise control of the three-dimensional spatial position of a hydrophone based on acoustic focusing. It includes a multi-channel signal transmitting device, a multi-channel signal acquiring device, a motion mechanism control device, a computer control system, a hydrophone under test, a sound source, a motion mechanism, and three focusing transducers (I, II, and III) arranged in a triangular configuration on the same plane. This invention places the hydrophone under test in the sound field formed by the focusing transducers. Through feedback from the acoustic signals received by each focusing transducer, the positioning mechanism is controlled to move the hydrophone under test until it is placed in a specific spatial position. This achieves precise control of the three-dimensional position of the hydrophone under test in the measurement area, reduces the influence of the placement position on the phase measurement of the hydrophone under test, and exhibits good repeatability.

The invention discloses a typhoon orientation estimation method, system and terminal based on a single vector hydrophone, and the method comprises the steps: carrying out the strict inspection of sound pressure and vibration velocity data in three directions collected by the single vector hydrophone, and guaranteeing the data quality; preprocessing the data, including filtering to remove noise interference, normalizing the filtered data, calculating the sound intensity in each direction in a certain azimuth angle and pitch angle search range, constructing a sound intensity matrix, and finding the azimuth angle and pitch angle corresponding to the maximum sound intensity as real reference values; and dividing the processed data into a training set and a test set in proportion, constructing a multilayer perceptron model, performing model optimization by testing different learning rates and small batch sizes, and selecting parameters with minimum loss to train an optimal model. And finally, predicting the test set by using the trained model to obtain estimated values of the azimuth angle and the pitch angle of the typhoon. According to the invention, the accuracy of typhoon azimuth estimation is effectively improved.

The present application provides a DOA estimation and error correction method and device based on joint sparse recovery. The method includes: using a linear array to receive target signals, establishing an array signal model that integrates phase errors, and constructing an optimization model based on multiple measurement vectors; using an iterative optimization solution algorithm, by compensating for the phase error in each iteration, the DOA gradually approaches the true value, thereby obtaining the estimation results of the spatial spectrum and phase error. The advantage of the present application is that the method proposed in the present invention corrects the random phase error caused by the array element position error, system frequency error, sound wave propagation error, etc. in the DOA estimation. In the presence of phase error, a signal model and an optimization problem are constructed, and the phase error and DOA estimation value are solved by an iterative algorithm, thereby obtaining a high-precision, low-sidelobe DOA estimation result. The proposed method is suitable for DOA estimation under conditions of small snapshots, strong noise, and random phase errors.

Method for calibrating an acoustic antenna (10), the acoustic antenna comprising a plurality of acoustic transducers (11k), each acoustic transducer being capable of emitting an electrical signal (sk) under the effect of the detection of an acoustic wave, the antenna comprising elementary transducers (11k) being distributed along an antenna line or an antenna plane, around a reference transducer (110), the antenna defining a principal axis (Y0), passing through the reference transducer, and perpendicular to the antenna line or the antenna plane, the method comprising the following steps: a) disposition of a calibration source (5) in at least one position (r0, rj) relative to the antenna, the calibration source being capable of emitting a calibration acoustic wave (6); b) measurement of the signals (sk) generated by all or part of the elementary transducers in response to the calibration acoustic wave;c) from the measurements taken in step b), determination of a time phase shift (p0k,n, pk,j) of the signal respectively generated by each elementary transducer; d) repetition of steps a) to c) such that during at least one iteration, the position of the calibration source is considered to be centered on the principal axis; the method comprising an estimation of a phase shift (Φk) of each elementary transducer with respect to the reference transducer. Figure 2B.

Provided is a device control method and apparatus. The method is applied to an audio device, and includes: receiving (101) an acoustic signal set, determining (102) a propagation characteristic of an acoustic signal in the acoustic signal set, determining (103), according to the propagation characteristic, a device parameter associated with audio play quality to be used by the audio device, and controlling (104) the audio device to play audio with the device parameter.

The present application relates to the technical field of action capture and spatial positioning, in particular to an acoustic action capture method and system based on a receiving end synchronization mechanism. The core innovation is to build a system architecture with the receiving end as the unified time reference, completely eliminating the asynchronous error of the traditional transmitting end synchronization architecture. To solve the problems of difficult determination of multiple transmitting node signals at the same time and signal aliasing of multiple sources, a unified time calibration mechanism of receiving end synchronization is adopted, combined with a hybrid signal scheduling scheme of grouping time division multiplexing and intra-group code division multiplexing. The system includes a coordinator, an ultrasonic transmitting terminal, an acoustic receiving array and other components. The coordinator provides a global clock through the IEEE 1588v2 protocol and PPS signal, the transmitting terminal transmits ultrasonic signals with a unique pseudo-random noise code, the receiving array separates the signals through parallel matched filtering and records accurate time stamps, and finally realizes high-precision positioning and attitude restoration through the time difference of arrival algorithm, environmental parameter correction and inverse kinematics model.