Point Sound Source Localization And Type Analysis Based On Mic Array

Point source localization based on mike array is the sound source localization research hotspot in recent years, is widely used in military field and field of speech enhancement, but relatively few applications in environmental noise monitoring. The main microphone array model of planar array and two vertical mike array. Planar array can be divided into the form of the space location: one word, T, circular, etc. Vertical array can considering the orientation of the sound source, can be more accurate in judging Angle, however, three-dimensional fast Fourier transform and the related algorithm, increased the operation complexity and the amount of time. Planar array to a certain extent reduced the amount of calculation, but in terms of detection height is limited by the corresponding.In this paper, on the basis of the predecessors’ sound source localization method, puts forward a sound localization system based on half spherical microphone array. First summarized the advantages and disadvantages of the existing sound source localization algorithm, combined with three dimensional complex sound field distribution, aiming at the microphone array localization algorithm calculation and the characteristics of not easy to transplant, half spherical sound source localization scheme, was proposed and designed for design is given and the theoretical basis of the localization algorithm deduction; Secondly, using the STM32 embedded processors on the microphone array data acquisition and processing, including voice signal normalization processing and the frequency of the sound signal is obtained by FFT transform information, first introduce the frequency noise source analysis, through the wireless transmission module will be processed data upload first place machine for further positioning process, and designed the data communication code, to achieve efficient data transmission; Finally, the design of system positioning experiment was carried out, respectively, on the different location of sound source localization testing, test data are given, with the help of the LabVIEW virtual instrument, the sound source localization, half spherical sound source localization system error are analyzed, obtained the good positioning effect.In this paper, we give the sound source localization system noise measuring resolution of 0.1 dB, the system position error is 5%, the frequency range of 100 Hz to 10 KHZ. 3-d mapping of the realization of the system is good a little bit of sound source, and has made a preliminary study to the type of sound source to distinguish, for follow-up study provides a new solution of sound source localization.