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Free-Field TDOA-AOA Sound Source Localization Using Three Soundfield Microphones | IEEE Journals & Magazine | IEEE Xplore

Free-Field TDOA-AOA Sound Source Localization Using Three Soundfield Microphones


3D Sound Source localization in the anechoic chamber.

Abstract:

Accurate source localization is an important problem in many research areas as well as practical applications in wireless communications and acoustic signal processing. T...Show More

Abstract:

Accurate source localization is an important problem in many research areas as well as practical applications in wireless communications and acoustic signal processing. This paper presents a passive three-dimensional sound source localization (SSL) method that employs a geometric configuration of three soundfield microphones. Two methods for estimating the angle of arrival (AOA) and time difference of arrival (TDOA) are proposed based on Ambisonics A and B format signals. The closed-form solution for sound source location estimation based on two TDOAs and three AOAs is derived. The proposed method is evaluated by simulations and physical experiments in our anechoic chamber. Simulations demonstrate that the estimation method can theoretically obtain Cramér-Rao lower bound for a small Gaussian noise present in AOA and TDOA observations. Investigation on the uncertainty of TDOA and AOA measurements depending on the length of measurement interval is also conducted. Experimental results in terms of RMSE indicate that the proposed solution can be used to accurately find a 3D position of the sound source in free-field environment. Performance evaluation regarding the number of estimation steps shows that higher accuracy can be achieved by longer observations of stationary sound source.
3D Sound Source localization in the anechoic chamber.
Published in: IEEE Access ( Volume: 8)
Page(s): 87749 - 87761
Date of Publication: 07 May 2020
Electronic ISSN: 2169-3536

Funding Agency:


References

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