Research On Virtual Instrument System Of Point Sound Source Based On Sensor Array

In contemporary society,sound source positioning system is widely used in military,industrial and civil fields.However,due to the complexity of the real environment,the localization accuracy of sound source positioning system is not high.It is a challenge in the field of sound source localization to overcome the influence of noise and reverberation.In order to improve the accuracy of sound source location in complex indoor environment,this paper studies the location algorithm of point sound source based on sensor array.Considering the real-time,practicability and accuracy of source location,the arrival time delay estimation algorithm is selected among the three sensor array-based source location algorithms.The main work contents are as follows:(1)An improved quadratic correlation delay estimation method is presented.In order to solve the problem of poor performance of quadratic correlation algorithm in complex environment,RLLMP and cepstrum method are introduced for signal preprocessing,and a quadratic correlation delay estimation algorithm based on the combination of RLLMP adaptive filtering and cepstrum prefiltering is proposed.The new algorithm shows strong robustness in complex environment.Simulation analysis of the proposed algorithm shows that the proposed algorithm can effectively suppress reverberation and noise in complex environment.(2)A new sensor array configuration is presented.Aiming at the problem of low positioning accuracy of planar five-element array,a new structure of three-dimensional six-element array is presented,and the position of the new array is calculated by using the spatial geometry method.Simulation results show that the new array structure designed in this paper has smaller pitch Angle estimation error than the planar five-element array,and more accurate positioning.(3)A stereo six-element sensor sound source positioning system is designed and built.And the acoustic source localization experiment is carried out in the actual environment,and the error analysis of the localization results is carried out.The experimental results show that the array has good performance of location under the complex condition,and can meet the requirements of indoor sound source location.