Sound source tracking system based on array microphone and its control method

Abstract

A sound source tracking system based on an array microphone and a control method thereof, including an array microphone, a filter and amplifying circuit, a single-chip microcomputer, a rotating pan-tilt and an encoder; when in use, the array microphone is used to pick up sound first; the microphone pickup signal passes through Frequency sampling filter processing; then the processed signal is sampled by the ADC of the single-chip microcomputer; after the final sampling, the sampled data is estimated by DOA, and the estimated angle is compared with the current angle of the PTZ to determine whether to rotate the PTZ and whether to rotate direction, so that the camera or the high-directivity microphone is aimed at the sound source; the present invention has the advantage of accurate tracking.

Description

technical field [0001] The invention relates to the technical field of sound source tracking, in particular to a sound source tracking system based on an array microphone and a control method thereof. Background technique [0002] In the prior art, in traditional array signal processing, narrowband signals are mainly processed. Narrowband signals refer to signals whose bandwidth is much smaller than the center frequency, and it is assumed that the signal source is located in the far field of the array, so the plane wave propagation theory can be used, It is considered that the signals are incident in parallel, and there is no amplitude difference between the signals received by each array element, only the phase difference caused by the propagation delay. The traditional array signal processing models and algorithms are based on the condition of narrowband signals, but the frequency of speech signals The range is 300-3400Hz, and the bandwidth is large, so the voice signal ca...

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Problems solved by technology

[0002] In the prior art, in traditional array signal processing, narrowband signals are mainly processed, and narrowband signals refer to signals whose bandwidth is much smaller than the center frequency, and it is assumed that the signal source is located in the far field of the array, so the plane wave propagation theory can be used, It is considered that the signals are incident in parallel, and there is no amplitude difference between the signals received by each array element, only the phase difference caused by the propagation delay. The traditional array signal processing models and algorithms are based on the condition of narrow-band signals, but the frequency The range is 300-3400Hz, and the bandwidth is large, so the voice signal cannot be directly processed

[0003] The existing sound source tracking system displays the acquisition of the sound source signal through the traditional array signal, and its shortcoming cannot realize accurate location and tracking of the sound source

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