Motion Sound Source Location Method And Analysis System Design Based On Generalized Weighted Cross-correlation Time Delay Estimation

The acoustic source location technology based on acoustic array is to use microphone array to collect sound signal,and to locate and track the spatial position of sound source by using the time delay of each microphone signal in the array,and is widely used in automobile and other fields.However,in the actual engineering environment,the sound source is often not static,especially in the automotive field,the noise is often generated in the process of movement.How to effectively control the noise has always been a difficult problem for the automotive industry.The movement of the car increases the difficulty of the sound source positioning.Therefore,it is of great significance to explore the positioning technology of the moving sound source for the production of the car,Only when the sound source is located accurately can the noise be controlled effectively.When identifying and locating the moving sound source,due to the relative motion between the noise source and the sound array,Doppler effect exists in the signal collected by the microphone,which makes the spectrum of the original signal shift.Therefore,before locating the moving sound source,it is necessary to correct the Doppler effect caused by the motion to recover the original spectrum structure of the signal,so that the sound source can be located more accurately.Under this background,this paper mainly studies the moving sound source localization method based on generalized weighted crosscorrelation time delay estimation,and develops a set of acoustic analysis and sound source localization system based on sound array.In order to solve the problem of Doppler effect caused by moving sound source,frequency offset is introduced to represent the influence of Doppler effect on the signal.Based on the frequency offset,a variable sampling method is used to modify the signal with Doppler effect,and the real sampling time point of the signal is resampled to recover the original spectrum structure of the signal.In order to solve the problem that the traditional generalized cross-correlation time delay estimation algorithm is easily affected by the sampling frequency and environmental noise,an improved interpolation algorithm near the peak of generalized weighted cross-correlation is proposed,which can effectively improve the accuracy of time delay estimation,and can still obtain higher accuracy at low sampling rate.Combined with the Doppler effect correction method,the moving sound source can be identified and located.In this paper,a set of acoustic analysis and sound source recognition system has been developed independently.The system supports more than 32 channels of signal synchronous acquisition,and can expand the test channels infinitely in theory.It can flexibly support various shapes and quantities of sound arrays.It has the basic functions of sound signal acquisition,time-frequency analysis and processing,statistical characteristics analysis and sound source location.