基于麦克风阵列的二维声音定位系统

AbstractA two-dimensional acoustic pulse marking system is designed andconstructed,which can detect sharp sounds anywhere near it,andaccurately mark its source vector using a servo-based pointer.Oursystem has a full 360-degree range and is very effective at marking sharpsound sources to within 0.03 degree accuracy.We were able to achievethis using a 3-microphone array and a 51 microcontroller microcontrollerwhich detects the acoustic delay between the microphones and calculatesthe source vector of the sound.The microphone signals pass through an8-level analog system to convert them into binary signals,indicatingwhether each of them is triggered by sound.Analyzing the time delay ofthese 3 binary signals,the microcontroller selects the best 2 microphonesto calculate the exact angle of the sound produced.Then control theservo motor to turn the pointer completely in that direction.The timedifference between the microphones is detected based on the time delay.The speed of airborne sound is approximately 340m /s,which issufficient to measure the time delay between the offset microphonesusing a 51 microcontroller microcontroller.These time delays weremeasured for 3 microphones,and basic trigonometry was used tocalculate the angle of sound production.To visually mark the soundsource,the system controls a centrally mounted servo motor that rotatesa pointer to the sound source.Keywords:microphone array;stepper motor;51 single-chipmicrocomputer