TAILIEUCHUNG - Báo cáo hóa học: " A Multidelay Double-Talk Detector Combined with the MDF Adaptive Filter"

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: A Multidelay Double-Talk Detector Combined with the MDF Adaptive Filter | EURASIP Journal on Applied Signal Processing 2003 11 1056-1063 2003 Hindawi Publishing Corporation A Multidelay Double-Talk Detector Combined with the MDF Adaptive Filter Jacob Benesty Universite du Quebec INRS-EMT 800 de la Gauchetiere Quest Suite 6900 Montreal Quebec Canada H5A 1K6 Email benesty@ Tomas Gansler Agere Systems 555 Union Boulevard Allentown PA 18109-3229 USA Email gaensler@agere. com Received 31 July 2002 and in revised form 5 March 2003 The multidelay block frequency-domain MDF adaptive filter is an excellent candidate for both acoustic and network echo cancellation. There is a need for a very good double-talk detector DTD to be combined efficiently with the MDF algorithm. Recently a DTD based on a normalized cross-correlation vector was proposed and it was shown that this DTD performs much better than the Geigel algorithm and other DTDs based on the cross-correlation coefficient. In this paper we show how to extend the definition of a normalized cross-correlation vector in the frequency domain for the general case where the block size of the Fourier transform is smaller than the length of the adaptive filter. The resulting DTD has an MDF structure which makes it easy to implement and a good fit with an echo canceler based on the MDF algorithm. We also analyze resource requirements computational complexity and memory requirement and compare the MDF algorithm with the normalized least mean square algorithm NLMS from this point of view. Keywords and phrases adaptive filtering frequency domain double-talk detection echo cancellation. 1. INTRODUCTION Network and acoustic echo cancelers work on the same principle. An echo canceler EC 1 to work well should include good solutions to two important problems a system identification problem and a so-called double-talk detection problem 2 . When the echo path is identified by an adaptive filter a function should be included to freeze the adaptation whenever a near-end signal is detected and .

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