Research On Sound Source Localization And Noise Reduction Algorithm Based On Microphone Array

With the development of science and technology,the computing power of human electronic devices is continuously enhanced,which makes the application of array signal processing in daily life possible.Microphone array technology is an important part of array signal processing.Compared with single microphone,microphone array technology can determine the direction of sound source and conduct directional sound pickup in a specific direction according to the direction of sound source,so as to mention the signalto-noise ratio and make spatial filtering possible.The main content of this paper is the sound source location and noise reduction algorithm based on microphone array.In the aspect of sound source location,an improved frequency-domain MUSIC algorithm focusing on the formant is proposed.After the improvement,the positioning accuracy of the algorithm is better than the traditional timedomain MUSIC algorithm,and the calculation amount is less than the traditional frequency-domain MUSIC algorithm.In terms of noise reduction algorithm,Sigmoid variable step function is used to improve the LMS algorithm.The improved algorithm can ensure faster convergence at the beginning of the gradient descent,and smaller convergence error after the completion of convergence,so that the beam in the interference direction to form a better zero trap.The C language sound source localization program is written for embedded platform.RK3308 embedded platform was built,and the improved sound source localization algorithm was implemented on the embedded platform.The two algorithm improvements proposed in this paper are both verified by Matlab simulation experiment that the improved algorithm is better than the traditional algorithm.The embedded platform using the improved localization algorithm is tested.The test results show that the system can achieve the sound source location function well and accurately.