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
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[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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