Attenuation Effects of Discrete Tone Using Adaptive Feedback Active Noise Control

Attenuation Effects of Discrete Tone Using Adaptive Feedback Active Noise Control

The attenuation characteristics of a slit resonator that combined the adaptive feedback ANC system at a ventilation aperture of the package for leakage noise is investigated. The discrete tones radiated from an AC axial flow fan are controlled by DSP using Filtered-X Least Mean Square algorithm. The...

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Veröffentlicht in:Journal of Environment and Engineering 2007, Vol.2(3), pp.470-479
Hauptverfasser: WATANABE, Seiji, YANAGIMOTO, Kensaku, TANIFUJI, Katsuya, SAKAMOTO, Shuichi, TAKAHASHI, Masayuki, ICHIMIYA, Ryoichi
Format: Artikel
Sprache:eng
Schlagworte:
Active noise control
Adaptive Control
Attenuation
Control systems
Control theory
Discrete Tone
Feedback
Least mean squares algorithm
Noise
Noise Control
Prominence Ratio
Resonators
Slit Resonator
Slits
Tone to Noise Ratio
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Beschreibung
Zusammenfassung:The attenuation characteristics of a slit resonator that combined the adaptive feedback ANC system at a ventilation aperture of the package for leakage noise is investigated. The discrete tones radiated from an AC axial flow fan are controlled by DSP using Filtered-X Least Mean Square algorithm. The attenuation is found at the range of: 3dB-14dB with circular slit resonator, 2dB-15dB with elliptic slit resonator. Results of measurement show that the proposed system can achieve TNR(Tone to Noise Ratio) and PR(Prominence Ratio) under threshold effectively.
ISSN:1880-988X
1880-988X
DOI:10.1299/jee.2.470