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Advances in Sound Localization Part 4

Tham khảo tài liệu 'advances in sound localization part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 7 Sound Source Localization Method Using Region Selection Yong-Eun Kim1 Dong-Hyun Su2 Chang-Ha Jeon2 Jae-Kyung Lee2 Kyung-Ju Cho3 and Jin-Gyun Chung2 1Korea Automotive Technology Institute in Chonan 2Chonbuk National University in Jeonju 3Korea Association Aids to Navigation in Seoul Korea 1. Introduction There are many applications that would be aided by the determination of the physical position and orientation of users. Some of the applications include service robots video conference intelligent living environments security systems and speech separation for hands-free communication devices Coen 1998 Wax Kailath 1983 Mungamuru Aarabi 2004 Sasaki et al. 2006 Lv Zhang 2008 . As an example without the information on the spatial location of users in a given environment it would not be possible for a service robot to react naturally to the needs of the user. To localize a user sound source localization techniques are widely used Nakadai et al. 2000 Brandstein Ward 2001 Cheng Wakefield 2001 Sasaki et al. 2006 . Sound localization is the process of determining the spatial location of a sound source based on multiple observations of the received sound signals. Current sound localization techniques are generally based upon the idea of computing the time difference of arrival TDOA information with microphone arrays Knnapp Cater 1976 Brandstein Silverman 1997 . An efficient method to obtain TDOA information between two signals is to compute the cross-correlation of the two signals. The computed correlation values give the point at which the two signals from separate microphones are at their maximum correlation. When only two isotropic i.e. not directional as in the mammalian ear microphones are used the system experiences front-back confusion effect the system has difficulty in determining whether the sound is originating from in front of or behind the system. A simple and efficient method to overcome this problem is to incorporate more microphones Huang et al. 1999 . .