tailieunhanh - Báo cáo hóa học: " Research Article Single-Channel Talker Localization Based on Discrimination of Acoustic Transfer Functions"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Single-Channel Talker Localization Based on Discrimination of Acoustic Transfer Functions | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 918404 9 pages doi 2009 918404 Research Article Single-Channel Talker Localization Based on Discrimination of Acoustic Transfer Functions Tetsuya Takiguchi Yuji Sumida Ryoichi Takashima and Yasuo Ariki Organization of Advanced Science and Technology Kobe University Kobe 657-8501 Japan Correspondence should be addressed to Tetsuya Takiguchi takigu@ Received 5 June 2008 Revised 3 November 2008 Accepted 5 February 2009 Recommended by Aggelos Pikrakis This paper presents a sound source talker localization method using only a single microphone where a Gaussian Mixture Model GMM of clean speech is introduced to estimate the acoustic transfer function from a user s position. The new method is able to carry out this estimation without measuring impulse responses. The frame sequence of the acoustic transfer function is estimated by maximizing the likelihood of training data uttered from a given position where the cepstral parameters are used to effectively represent useful clean speech. Using the estimated frame sequence data the GMM of the acoustic transfer function is created to deal with the influence of a room impulse response. Then for each test dataset we find a maximum-likelihood ML GMM from among the estimated GMMs corresponding to each position. The effectiveness of this method has been confirmed by talker localization experiments performed in a room environment. Copyright 2009 Tetsuya Takiguchi et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Many systems using microphone arrays have been tried in order to localize sound sources. Conventional techniques such as MUSIC and CSP . 1-4 use simultaneous phase information from microphone arrays to estimate the .