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Paper Abstract and Keywords
Presentation 2022-03-01 09:20
[Poster Presentation] Amplitude modulation on high frequency noise induced by non-stationary audio system and its effect in audible range
Masahide Kita, Shinichi Miyamoto, Yukiyasu Okamura, Kiminobu Nishimura (Kindai Univ.) EA2021-66 SIP2021-93 SP2021-51
Abstract (in Japanese) (See Japanese page) 
(in English) In a linear-stationary audio, as frequency components of signal are independent each other, an effect of noise in supersonic frequency region is not expected to cause noise in audible frequency region. An audio system in replaying a music should be considered a non-stationary system, because of non-stationary output which cause fluctuation in bias of power supply circuit. In this study, we assumed that noise in supersonic range generates noise in audible range by amplitude modulation for non-stationary system. Amplification factor in audio amplifier fluctuates related to fluctuation of audio signal. This fluctuation expects to cause amplitude-modulation to carrier of noise in supersonic region. To confirm this process to generate noise in audible region, we carried out a simulation that the supersonic noise produces an audible noise related with fluctuation of amplification factor. And these facts are also confirmed experimentally.
Keyword (in Japanese) (See Japanese page) 
(in English) Audio equipment / Non-stationary system / Amplitude modulation / Noise / Supersonic wave / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 383, EA2021-66, pp. 15-20, March 2022.
Paper # EA2021-66 
Date of Issue 2022-02-22 (EA, SIP, SP) 
ISSN Online edition: ISSN 2432-6380
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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 EA2021-66 SIP2021-93 SP2021-51

Conference Information
Committee EA SIP SP IPSJ-SLP  
Conference Date 2022-03-01 - 2022-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EA 
Conference Code 2022-03-EA-SIP-SP-SLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Amplitude modulation on high frequency noise induced by non-stationary audio system and its effect in audible range 
Sub Title (in English)  
Keyword(1) Audio equipment  
Keyword(2) Non-stationary system  
Keyword(3) Amplitude modulation  
Keyword(4) Noise  
Keyword(5) Supersonic wave  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masahide Kita  
1st Author's Affiliation Kindai University (Kindai Univ.)
2nd Author's Name Shinichi Miyamoto  
2nd Author's Affiliation Kindai University (Kindai Univ.)
3rd Author's Name Yukiyasu Okamura  
3rd Author's Affiliation Kindai University (Kindai Univ.)
4th Author's Name Kiminobu Nishimura  
4th Author's Affiliation Kindai University (Kindai Univ.)
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Speaker Author-1 
Date Time 2022-03-01 09:20:00 
Presentation Time 120 minutes 
Registration for EA 
Paper # EA2021-66, SIP2021-93, SP2021-51 
Volume (vol) vol.121 
Number (no) no.383(EA), no.384(SIP), no.385(SP) 
Page pp.15-20 
#Pages 6 
Date of Issue 2022-02-22 (EA, SIP, SP) 

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