Research on Sound Source Localization System Based on Digital Microphone Array
Aimed at the problems of large volume,cumbersome signal acquisition process,low efficiency and poor real-time posi-tioning effect in multi-microphone positioning array,this paper presents a sound source positioning system by which three digital mi-crophones are used to construct an array.The system utilizes the time domain information of three microphones and the generalized cross-correlation algorithm to calculate the arrival time delay.The geometric relationship of the array element and the delay of the ar-ray element signal are used to obtain a better sound source localization effect in the indoor environment.Taken MAXI-Bit as a main control chip,the digital microphone in the system hardware is selected to form a three-way linear array and collect the sound data,the MCU collects the microphone signal and processes the data to realize the location of the sound source.Finally,the direction and dis-tance of the sound source are displayed in real time on the LCD screen.In addition,in order to more directly reflect the accuracy of the sound source positioning,a servo control module is also designed,and the laser light is fixed on the servo module to indicate the sound source,and the steering gear rotation angle changes in real time with the change in the sound source position.Through testing,the system has a maximum error of 4.68％,and the laser light on the servo can point to the sound source in real time,with the position of the sound source changed.The system can be applied in mechanical equipment fault diagnosis,whistle capture and other fields,thereby improving production efficiency.
万方数据
维普
