Research On Sound Source Location Method And Device Based On Time Measurement

The sound source positioning technology which based on the time measurement is a popular research field and widely used in conference systems,car phones,shooting positioning and military gun positioning and other fields.Many researchers both at home and abroad have developed a number of products in the field of sound source positioning technology,but compared to abroad,due to the earlier technology in the field and more research results,most of the domestic research in the field of technology still remain at the level of algorithm research,and there are very few products with independent intellectual property rights.Therefore,aiming at this situation,this paper will mainly study the realization of sound source location and realize a set of devices.First this paper analyzes the status quo of sound source positioning system at home and abroad,and explains the importance of studying the system for the development of our country in related fields,and elaborates the characteristics and application of sound source location system.Chan algorithm and Taylor algorithm based on arrival time difference technique which are two kinds of classical algorithm are analyzed and simulated in depth.It is proposed that the two algorithms can be combined into Chan-Taylor collaborative algorithm to calculate the location of the target sound source.This paper also designs a set of sound source positioning system,and finally implements and tests on the system hardware platform to verify the feasibility of the algorithm,and then gives and analyzes the test results.This paper studies and designs the sound positioning device can be divided into three modules: the first is the receiving unit,the receiving unit using ultrasonic sensors,first of all,to enlarge the received sound signal,and then filter to achieve the purpose of frequency selection to remove noise.The second is the logic,timing and display module,this unit consists of grab time circuit and timing circuit.The reception timing of the reception unit of the first received sound is used as the timing start signal of the other time unit,and the other time unit receives the sound timing as the unit stop timing signal.All the timing units have received the sound signal to stop the time,at the same time send the end of the signal to the SCM unit.SCM based on the timing data to calculate and determine the location of the sound source,the results sent to the display module,at the same time send the results to the host computer.SCM communication using RS485 and wireless two ways,the SCM measure the ambient temperature and humidity at any time,in order to measure the data for emperature and humidity compensation.The third is the host computer control unit,the function is to communicate with SCM and implement the positioning algorithm based on TDOA.The sound source localization algorithm of the host computer adopts the Chan-Taylor cooperative algorithm based on TDOA,The basic principle of Chan algorithm is that the nonlinear equations listed according to the basic principle of TDOA are transformed into linear equations,and then the least squares method is used to solve them.It has the advantages of small computation and high precision.The basic principle of Taylor algorithm is to expand Taylor at the initial estimation position,and to reduce the gap between the estimated position and the real value gradually by iterative calculation.It has a high accuracy and the combination of the two algorithms can be realized.The experimental results show that the structure of the whole positioning device is simple and the positioning accuracy is basically the experimental requirement.