5 research outputs found
Localization of sound sources : a systematic review
Sound localization is a vast field of research and advancement which is used in many useful applications to facilitate communication, radars, medical aid, and speech enhancement to but name a few. Many different methods are presented in recent times in this field to gain benefits. Various types of microphone arrays serve the purpose of sensing the incoming sound. This paper presents an overview of the importance of using sound localization in different applications along with the use and limitations of ad-hoc microphones over other microphones. In order to overcome these limitations certain approaches are also presented. Detailed explanation of some of the existing methods that are used for sound localization using microphone arrays in the recent literature is given. Existing methods are studied in a comparative fashion along with the factors that influence the choice
of one method over the others. This review is done in order to form a basis for choosing the best fit method for our use
Exploiting Rays in Blind Localization of Distributed Sensor Arrays
Many signal processing algorithms for distributed sensors are capable of
improving their performance if the positions of sensors are known. In this
paper, we focus on estimators for inferring the relative geometry of
distributed arrays and sources, i.e. the setup geometry up to a scaling factor.
Firstly, we present the Maximum Likelihood estimator derived under the
assumption that the Direction of Arrival measurements follow the von
Mises-Fisher distribution. Secondly, using unified notation, we show the
relations between the cost functions of a number of state-of-the-art relative
geometry estimators. Thirdly, we derive a novel estimator that exploits the
concept of rays between the arrays and source event positions. Finally, we show
the evaluation results for the presented estimators in various conditions,
which indicate that major improvements in the probability of convergence to the
optimum solution over the existing approaches can be achieved by using the
proposed ray-based estimator.Comment: 5 pages, 2 figures, Accepted to ICASSP 202
From Acoustic Room Reconstruction to SLAM
Recent works on reconstruction of room geometry from echoes assume that the geometry of the sensor array is known. In this paper, we show that such an assumption is not essential; echoes provide sufficient clues to reconstruct the room’s and the array’s geometries jointly, even from a single acoustic event. Rather than focusing on the combinatorial problem of matching the walls and the recorded echoes, we provide algorithms for solving the joint estimation problem in practical cases when this matching is known and the number of microphones is small. We then explore intriguing connections between this problem and simultaneous localization and mapping (SLAM), and show that SLAM can be solved by the same methods. Finally, we demonstrate how effective the proposed methods are by numerical simulations and experiments with real measured room impulse responses