7results about "Systems with adjusting phase/time-lag-errors" patented technology

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.

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.

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.