Paper Abstract and Keywords |
Presentation |
2008-05-30 11:25
A method steadily reducing acoustic echo against double-talk Ryuichi Oka, Kensaku Fujii (Univ. of Hyogo), Mitsuji Muneyasu (Kansai Univ.) EA2008-21 SIP2008-30 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
This paper proposes a stepsize control method without distinguishing double-talk and echo path change. In acoustic echo canceller systems, the coefficients of adaptive filter are disturbed by three factors: the power fluctuation of reference signal (far-end talker’s signal), the superposition of noise (near-end talker’s signal) called double talk and echo path change. The disturbance caused by the first one, can be prevented by applying block length control to block implementation algorithms. The other two can be solved by distinguishing the echo path change and the double talk and by increasing and decreasing the step size in the former and the latter cases, respectively. However, it is difficult to distiguish them quickly and exactly. This paper hence proposes a step size control method decreasing the estimation error steadily without the distinguishment. For the control, this method uses a sub adaptive filter with a fixed large step size and fewer taps than those of a main adaptive filter. Naturally, this filter provides smaller residual echo than the main filter does. This control method applies the step size calculated using the residual echo to the main filter; consequently a large and small step size can be automatically provided in the echo path chnage and the double talk, respectively. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
echo canceller / double talk / echo path change / block length control / step size control / / / |
Reference Info. |
IEICE Tech. Rep., vol. 108, no. 69, EA2008-21, pp. 19-26, May 2008. |
Paper # |
EA2008-21 |
Date of Issue |
2008-05-23 (EA, SIP) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
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EA2008-21 SIP2008-30 |
Conference Information |
Committee |
SIP EA |
Conference Date |
2008-05-29 - 2008-05-30 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Kansai Univ. |
Topics (in Japanese) |
(See Japanese page) |
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Paper Information |
Registration To |
EA |
Conference Code |
2008-05-SIP-EA |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
A method steadily reducing acoustic echo against double-talk |
Sub Title (in English) |
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Keyword(1) |
echo canceller |
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double talk |
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echo path change |
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block length control |
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step size control |
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1st Author's Name |
Ryuichi Oka |
1st Author's Affiliation |
University of Hyogo (Univ. of Hyogo) |
2nd Author's Name |
Kensaku Fujii |
2nd Author's Affiliation |
University of Hyogo (Univ. of Hyogo) |
3rd Author's Name |
Mitsuji Muneyasu |
3rd Author's Affiliation |
Kansai University (Kansai Univ.) |
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Speaker |
Author-1 |
Date Time |
2008-05-30 11:25:00 |
Presentation Time |
25 minutes |
Registration for |
EA |
Paper # |
EA2008-21, SIP2008-30 |
Volume (vol) |
vol.108 |
Number (no) |
no.69(EA), no.71(SIP) |
Page |
pp.19-26 |
#Pages |
8 |
Date of Issue |
2008-05-23 (EA, SIP) |
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