The Research On Acoustic Recognition And Localization Technology Based On Microphone Array

With the continuous development of array technology and audio processing technology,microphone array is extensively used in acoustic acquisition and processing systems.The microphone array has extremely strong anti-interference ability and high spatial resolution,which can solve the acoustic problems that cannot be solved by a single microphone.This thesis mainly studies the technical principle of acoustic recognition and localization system based on microphone array,and designs this system.The central work completed is as follows:(1)The related principles of acoustic recognition and localization system based on microphone array were studied.The acoustic recognition technology based on short-term time domain analysis of acoustic signals and the acoustic source localization technology based on time difference of arrival were analyzed.The general design scheme of acoustic recognition and localization system based on microphone array was proposed.(2)The acoustic recognition and localization system based on microphone array was realized.The hardware circuit of the system was designed.The hardware circuit chiefly includes MEMS digital microphone array circuit,field programmable gate array data processing unit circuit,data communication level conversion circuit,indicator array circuit and so on.In the field programmable gate array,the acoustic recognition and localization algorithm logic were realized.This part completed the timing drive of MEMS digital microphone array,the realization of the acoustic recognition algorithm based on short-term time domain analysis of acoustic signals,the realization of the acoustic localization algorithm based on time difference of arrival,the design of the data communication module,the display driver of the array indicator,and the generation of control logic.(3)The test and verification of acoustic recognition and localization system based on microphone array were completed.The experimental test platform was built,and a series of experimental tests were carried out on the acoustic recognition and localization system based on the microphone array.These experimental tests include acoustic signal acquisition,acoustic signal time delay estimation,acoustic recognition and localization.Experimental test results show that:the designed acoustic recognition and localization system based on the microphone array completes the synchronous acquisition of 8 channels of acoustic signals,realizes the estimation of acoustic time delay,completes the recognition of specific acoustic signals,and completes the acoustic source localization.All parts of the system work well and basically meet the design requirements.