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Paper Abstract and Keywords
Presentation 2018-07-24 13:00
[Poster Presentation] Denoising Method for Underwater Acoustic Signals by Using Hough Transform
Yoshihiro Taira, Takashi Matsubara, Keisuke Iwai, Takakazu Kurokawa (NDA) EA2018-11
Abstract (in Japanese) (See Japanese page) 
(in English) Underwater acoustic signals are used in various fields such as marine environmental measurement, exploration of sea bottom resources, ecological monitoring, etc. Underwater acoustic noise is colored, and its power spectral density is higher in the low frequency domain. A spectrogram is a visual representation that a signal is passed through a window function, a frequency spectrum is calculated, and a time-frequency variation of a signal is visually represented. A noise removal method of a spectrogram has proposed by using image processing, where a spectrogram is considered as an image. In Ugo’s research, the noises were removed by applying a pre-whitening and the mathematical morphological filter to the spectrogram of the signal with the underwater noise. However there are some problems that the target signals are vanished when SNR is very low in the low frequency domain. In this research, we assume that the target signals are frequency modulated (FM) signals and the underwater noises’powers are higher in the low frequency domain. The proposed method can restore the signals vanished in the low frequency domain by using surrounding information extracted from the time-frequency binary image by the Hough transform.
Keyword (in Japanese) (See Japanese page) 
(in English) underwater acoustic signal / time-frequency analysis / noise reduction / Hough transform / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 149, EA2018-11, pp. 59-64, July 2018.
Paper # EA2018-11 
Date of Issue 2018-07-17 (EA) 
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)
Download PDF EA2018-11

Conference Information
Committee EA ASJ-H ASJ-AA  
Conference Date 2018-07-24 - 2018-07-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Engineering/Electro Acoustics, Psychological and Physiological Acoustics, Architectural Acoustics, Education in Acoustics, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2018-07-EA-H-AA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Denoising Method for Underwater Acoustic Signals by Using Hough Transform 
Sub Title (in English)  
Keyword(1) underwater acoustic signal  
Keyword(2) time-frequency analysis  
Keyword(3) noise reduction  
Keyword(4) Hough transform  
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1st Author's Name Yoshihiro Taira  
1st Author's Affiliation National Defense Academy of Japan (NDA)
2nd Author's Name Takashi Matsubara  
2nd Author's Affiliation National Defense Academy of Japan (NDA)
3rd Author's Name Keisuke Iwai  
3rd Author's Affiliation National Defense Academy of Japan (NDA)
4th Author's Name Takakazu Kurokawa  
4th Author's Affiliation National Defense Academy of Japan (NDA)
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Speaker Author-1 
Date Time 2018-07-24 13:00:00 
Presentation Time 90 minutes 
Registration for EA 
Paper # EA2018-11 
Volume (vol) vol.118 
Number (no) no.149 
Page pp.59-64 
#Pages 6 
Date of Issue 2018-07-17 (EA) 

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