Design And Research Of Sound Source Location System Based On Microphone Array

Microphone array localization of sound source refers to the use of multiple microphones arranged according to a certain rule,through the high-speed highprecision data acquisition card for the sound source signal acquisition,and then according to time delay estimation,solution conic equation,autocorrelation correlation algorithm and wave speed measure out the spatial position of the sound.Compared with a single microphone signal,the array microphone has the advantages of simple equipment and no interference with the transmission medium,and it can be widely used in audio or video conferencing,speech recognition,industrial robot positioning,and the like.However,the microphone array sound source positioning system involves a large amount of computation and high system cost.This dissertation focuses on the difficulties of high-speed and high-precision data acquisition,simultaneous sampling of large-area topologies,and the complex problems of microphone array sound source localization algorithms.We have developed sound source localization algorithms and software and hardware system development work.We finally completed the design of a microphone array positioning system prototype.Through hardware and related algorithm software testing,we verified the rationality of hardware and software design.The microphone array positioning experiment results show that the system can realize simultaneous synchronization of multiple microphone signals,data storage and wireless transmission,human-computer interaction and acquisition control,and visualization of positioning results.For the 24-bit quantization accuracy,the ADC data sampling rate can reach 200 K,and the positioning system refresh rate can reach 25 FPS.After many experiments and analysis,the position accuracy of the system is ±0.03 m and the azimuth positioning accuracy is ±0.04 degrees.The pitch angle positioning accuracy is ±0.2 degrees,and the relative error of the positioning is less than 5%,They can meet the general application requirements.