Method and system for positioning sound source in enclosed space based on spatial pulse response matching

Abstract

The invention discloses a method and a system for positioning a sound source in an enclosed space based on spatial pulse response matching. The method comprises the steps: dividing a to-be-tested enclosed space into a plurality of grids, using the centers S1, S2...Sn of the grids as sampling positions, measuring pulse responses at two microphones Ra and Rb and obtaining n pairs of spatial pulse responses by measurement; using signals (H1aH1b), (H2aH2b)...(HnaHnb) subjected to Fourier transformation as a template base; measuring an unknown sound source to obtain a pair of signals (fafb) on a time domain, performing Fourier transformation to obtain FaFb, performing correlation analysis among Fa-Fb ratio, F1a-F1b ratio, F2a-F2b ratio...Fna-Fnb ratio to obtain all correlation factors, and utilizing the corresponding position of the maximum correlation factor as the sound source position. The method and the system for positioning the sound source in the enclosed space based on spatial pulse response matching have higher precision and broad application prospect for positioning the sound source in the enclosed space.

Description

technical field [0001] The invention relates to a closed space sound source localization method based on spatial impulse response matching, which can be applied to sound source localization of any type of closed space, especially a closed space with complex environment and high degree of reverberation. Background technique [0002] Sound source localization in a closed space is an important part of acoustic research, and it has wide applications in many aspects of people's lives, such as noise source localization in aircraft cabins, intelligent microphone sound transmission control systems in conference rooms, and Parking space recognition system in underground garage, etc. The main feature of this type of space is that the environment is complex and the reverberation degree is high, and some small-scale spaces also have serious sound wave interference and diffraction effects, which require high accuracy and stability of sound source localization technology. [0003] Existi...

AI Technical Summary

Problems solved by technology

First of all, for the controllable wave formation technology based on the maximum output power, a large-scale microphone array is required to obtain high positioning accuracy, which will cause a great burden economically; Due to the limitation, only the sound source in the far field can be positioned. In a small-scale closed space, the positioning accuracy will be greatly reduced.

Secondly, for the sound source localization method based on high-resolution spectral estimation technology, the sound source or noise in the space must be stable and time-invariant, but this is difficult to achieve in the actual acoustic environment for speech signals; at the same time , there are still many assumptions for sound source localization based on high-resolution spectrum estimation, which is impossible for a real-time implementation system; Causes inaccurate localization, so it is rarely used in modern sound source localization systems

Third, for the positioning technology based on the time difference of arrival, the sound source localization actually only locates the direction of the sound source, and the specific distance cannot be given. In addition, this method is greatly affected by the reverberation of the environment. When the reverberation At higher degrees, the accuracy is very low

Fourth, in the actual positioning process of the single-microphone sound source localization technology based on time reversal, the impulse response from the sound source to the receiving position needs to be obtained, which requires the sound source to have a special form of signal, which is difficult to achieve in practice. limit its application

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