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Paper Abstract and Keywords
Presentation
Acoustic characteristics of Non-Audible Murmur and NAM Microphone Response
Shota Shimizu, Makoto Otani, Tatsuya Hirahara (Toyama Pref. Univ.) SP2007-38
Abstract (in Japanese) (See Japanese page) 
(in English) Acoustic characteristics of Non-Audible Murmur (NAM) and response characteristics of soft-silicon type NAM microphone are clarified. The NAM is a very weak whispered body-couducted voice, which can be detected by specially designed microphone attached to the neck surface. Individual differences of three NAM microphones are small. Frequency response of NAM microphone decays at -17 dB/octave. NAM microphone sensitivity is about -36 dB (1 V/1 Pa = 0 dB @1 kHz). NAM signals were recorded from 26 male and 17 female speakers; total amount of the data is about 630 minutes. The signal-to-noise ratio of NAM signals is about 16 dB with 8 kHz bandwidth. Band width of the NAM signal is about 3 kHz. Long-term averaged Spectrum (LTAS) of NAM signals show energy concentration around 500 to 800 Hz and a -17 dB/octave roll off. After compensating the NAM microphone response, the LTAS of the raw NAM signals show energy concentration around 200 to 300 Hz and a -23 dB/octave roll off. This result roughly corresponds to the numerical simulation of transfer characteristics of sound propagating in head and neck.
Keyword (in Japanese) (See Japanese page) 
(in English) Non-Audible-Murmur(NAM) / NAM microphones / Acoustic characteristics / Frequency response / Long-term averaged Spectrum(LTAS) / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 165, SP2007-38, pp. 85-90, July 2007.
Paper # SP2007-38 
Date of Issue  
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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Conference Information
Committee SP  
Conference Date 2007-07-26 - 2007-07-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Toyama Prefectural University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Speech Production, Speech Perception, Hearing and Speech, etc. 
Paper Information
Registration To SP 
Conference Code 2007-07-SP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Acoustic characteristics of Non-Audible Murmur and NAM Microphone Response 
Sub Title (in English)  
Keyword(1) Non-Audible-Murmur(NAM)  
Keyword(2) NAM microphones  
Keyword(3) Acoustic characteristics  
Keyword(4) Frequency response  
Keyword(5) Long-term averaged Spectrum(LTAS)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Shota Shimizu  
1st Author's Affiliation Toyama Prefectural University (Toyama Pref. Univ.)
2nd Author's Name Makoto Otani  
2nd Author's Affiliation Toyama Prefectural University (Toyama Pref. Univ.)
3rd Author's Name Tatsuya Hirahara  
3rd Author's Affiliation Toyama Prefectural University (Toyama Pref. Univ.)
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Speaker Author-1 
Date Time  
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Registration for SP 
Paper # SP2007-38 
Volume (vol) vol.107 
Number (no) no.165 
Page pp.85-90 
#Pages 6 
Date of Issue  

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