Presentation	2000/9/22 Active control of one dimensional sound field in ducts Masashi Yamada,
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Abstract(in English)	For active control of one dimensional sound wave propagation in ducts, it is necessary to avoid the acoustic feedback which occurs because of detecting control sounds from additive source by sensing microphone. In this study, unidirectional source and unidirectional microphone are used to achieve stable sound attenuation of duct system. On-line control Experiments were operated with random noise and periodic noise to investigate the effectiveness of such system. As a result of experiments, active noise attenuation was performed well and this system was free from not only acoustic feedback but also boundary condition of ducts.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	noise / active control / duct / unidirectional source / unidirectional microphone
Paper #	EA2000-48
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Conference Information
Committee	EA
Conference Date	2000/9/22(1days)
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Paper Information
Registration To	Engineering Acoustics (EA)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Active control of one dimensional sound field in ducts
Sub Title (in English)
Keyword(1)	noise
Keyword(2)	active control
Keyword(3)	duct
Keyword(4)	unidirectional source
Keyword(5)	unidirectional microphone
1st Author's Name	Masashi Yamada
1st Author's Affiliation	Niihama National College of Technology()
Date	2000/9/22
Paper #	EA2000-48
Volume (vol)	vol.100
Number (no)	329
Page	pp.pp.-
#Pages	6
Date of Issue