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Unmanned aerial vehicle sound signal enhancement method based on tetrahedron microphone array

A microphone array, sound signal technology, applied in speech analysis, instruments, etc., can solve the problems of signal analysis errors and low cost, and achieve the effect of increasing accuracy, good real-time performance, and enhancing the sound signal of drones

Active Publication Date: 2018-09-21
ZHEJIANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current research content, most rely on the method of using priori signal correction to improve the accuracy of sound signal analysis, but the key to this method lies in the extraction of priori knowledge. Once the data at the previous moment is wrong, the entire follow-up Significant errors will occur in the analysis of signals. Therefore, a new method is urgently needed to truly improve the signal-to-noise ratio of effective signals, while ensuring faster operation speed and lower system cost.

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  • Unmanned aerial vehicle sound signal enhancement method based on tetrahedron microphone array
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  • Unmanned aerial vehicle sound signal enhancement method based on tetrahedron microphone array

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] The invention provides a method for enhancing the sound signal of an unmanned aerial vehicle based on a tetrahedral microphone array, comprising the following steps:

[0041] (1) Perform Fourier transform on the UAV sound signal collected by the tetrahedral microphone array:

[0042]

[0043] Where x(t) represents the sound signal received by each microphone located at the vertex in the tetrahedral microphone array at time t, F x (jw) represents the sound signal after the Fourier transform;

[0044] (2) A fundamental frequency harmonic and a series of fundamental frequency harmonics will be generated when the UAV is flying, and the F obtained in step (1) x (jw) is a complex vector, take the F obtained in step (1) x The modulus value of the harmonic between 100Hz-1000Hz in (jw) forms a row vector as the eigenvector of the ...

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Abstract

The present invention discloses an unmanned aerial vehicle sound signal enhancement method based on a tetrahedron microphone array. The method comprises the steps of: employing a minimum variance distortionless response (MVDR) method and feature frequencies of unmanned aerial vehicle sound signals to roughly estimate the direction of the unmanned aerial vehicle, employing array signal processing to inversely deduce the time delay between the microphones, then performing delay summation processing of original signals on a time domain through wave beams, performing weighing of multi-path signaldelays to the same time node, finally obtaining a set of signals to achieve an effect of unmanned aerial vehicle sound signal enhancement, and at the same time, employing the processing mentioned above for each array element of the tetrahedron to perform signal enhancement of all the microphones of the tetrahedron. The unmanned aerial vehicle sound signal enhancement method fully utilizes the information of each microphones of the tetrahedron to perform signal enhancement to obtain enhancement signals having the same quality as the receiving signals so as to greatly improve the signal to noiseratio of the receiving signals and have a high value for the sound array processing field.

Description

technical field [0001] The invention relates to the field of array signal enhancement, in particular to tetrahedral microphone array signal processing and delay-sum beamforming. Background technique [0002] The background of the present invention is based on actual needs. In recent years, when UAVs quickly became a research hotspot, it also brought a series of problems, such as UAV black flying, seriously affecting regional security. Therefore, drone defense is becoming a new area of ​​focus for governments and military forces. The sound of the drone has a distinctive signature that can effectively detect objects flying in the air. By setting up multiple microphone arrays, the signal of the UAV can be effectively collected, but the noise in the actual environment, the noise during the transmission of the signal in the circuit equipment, and some other reverberation, multipath interference, etc., the collected sound The signal is very noisy. Therefore, sound signal enhan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208G10L21/0216
CPCG10L21/0208G10L21/0216G10L2021/02166
Inventor 陈积明吴泽先史治国常先宇杨超群史秀纺吴均峰
Owner ZHEJIANG UNIV
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