Research On Sound Source Location Method Based On Microphone Array

Locating the sound source in the indoor acoustic environment has a wide range of applications in real life,such as small venues,classroom teaching,stage performances and so on.With the development of array signal processing technology,the microphone array technology is applied to sound source localization.The method determines the sound source spatial position by processing the signals of the Multiple microphones.To solve the problem of large positioning error of the existing method under the conditions of high noise and high reverberation,analyzed and improved the positioning method,and designed a high anti-noise and anti-reverb Microphone Array Sound Source Positioning System.Through the comparison of the sound source localization methods,the subject chooses the sound source localization method based on TDOA as the research project.The signal processing model of sound source localization is analyzed.Aiming at the scene of indoor application,through comparison,select the suitable space model and signal model to study the indoor reverberation.The signal preprocessing is studied.According to the characteristics of the speech signal,study the methods of signal prefiltering,windowing frame segmentation and endpoint detection and parameter selection,and implement the preprocessing.The thesis systematically study The algorithm of delay estimation,introduce the GCC-MLPT algorithm,analyse its algorithm flaw,propose the improved GCC-IMLPT algorithm according to its deficiencies,verify the performance of GCC-IMLPT algorithm by simulation experiments.The thesis study the localization algorithm based on time-delay estimation,by comparison,select the the spherical interpolation algorithm with small computation and better real-time performance,and analyse the relationship between the estimation error and the number of microphones and the error of the algorithm.The thesis Design the sound source localization system based on the microphone array,study the topology of the microphone array,determine the the shape and size of the microphone array,and design the the functions of each part of the system in detail.the performance of the system is simulated and the actual environment is tested,Verify the performance of the system,and analyze the error of the system,and finally put forward the next improvement.