基于麥克風(fēng)陣列的移動(dòng)聲源定位研究
[Abstract]:In recent years, using microphone array to estimate the angle and position of signal source has become a hot research direction. There have been a lot of applications in audio and video conference camera, such as automatic tracking of audio and video conference camera, enhancement of sound denoising of hearing aid, sound tracking of intelligent robot and so on. However, the research on track location of moving sound source is still rare. In this paper, based on the widely used (TDOA) and high-resolution spectral estimation (MUSIC) algorithm, the track location of mobile sound source is studied, and the angle locus of sound source changing with time is estimated. Firstly, three basic localization methods are studied, the microphone array structure and its signal model are introduced, and a uniform linear array model for moving sound source location is introduced. Secondly, several different time delay estimation methods are analyzed and compared, and the generalized cross-correlation algorithms are simulated for different weighting functions. The anti-noise performance of different weighting functions is analyzed, and the PHAT-GCC algorithm is discussed emphatically. Thirdly, the basic theory of high-resolution spectral estimation (MUSIC) algorithm in subspace technology is studied. In view of the complexity of eigenvalue decomposition of covariance matrix, a no-eigenvalue algorithm is used to maintain the accuracy of spectral estimation. The efficiency of estimation is improved, and the simulation is done. Finally, aiming at the array signal model of moving sound source locus location, two kinds of algorithms, PHAT-GCC generalized cross-correlation and MUSIC with no eigenvalue decomposition, are used to simulate and estimate the track of pitch angle of sound source in the process of motion. The influence of signal to noise ratio, sampling rate and moving velocity on the positioning system is analyzed by simulation. The frequency offset problem brought by movement to the location system is corrected.
【學(xué)位授予單位】:燕山大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN642;TN911.7
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