Duplex Acoustic Echo Cancellation
碩士 === 國立交通大學 === 電信研究所 === 83 === This thesis focuses on closed-loop analysis of duplex acoustic echo cancellation (DAEC) with applications to teleconference and speaker-phone. Adaptation process and closed-loop ERLE are discussed. The causes and prevent...
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| Format: | Others |
| Language: | en_US |
| Published: |
1995
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| Online Access: | http://ndltd.ncl.edu.tw/handle/08829762185668012373 |
| Summary: | 碩士 === 國立交通大學 === 電信研究所 === 83 === This thesis focuses on closed-loop analysis of duplex acoustic
echo cancellation (DAEC) with applications to teleconference
and speaker-phone. Adaptation process and closed-loop ERLE are
discussed. The causes and prevention of the closed-loop are
also discussed. Several double talk detection methods are
introduced and their advantages and drawbacks are discussed. An
improved method to distinguish double-talk conditions from room
impulse response variation is suggested. In the final part of
this thesis, a novel acoustic echo cancellation method using a
pair of complementary filters is proposed. In this nonadaptive
scheme, training coefficients of filter and double talk
detection are no longer needed. Computer simulations are
provided under different schemes of DAEC''s.
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