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Active attenuation of noise in HVAC systems.

Author(s) : LEVENTHALL H. G., WISE S. S., DINEEN S.

Type of article: Article

Summary

Sound waves within a duct can be cancelled out by propagating an equal but opposite phase noise in the duct. An input microphone measures the noise and generates the antidote, which is fed into a duct loudspeaker. This second signal tends to travel upstream and contaminate the original signal, requiring adaptive electronic filtration in the circuit. The same attenuation can be achieved as with passive devices but with no air pressure losses. A.R.T.

Details

  • Original title: Active attenuation of noise in HVAC systems.
  • Record ID : 1996-0432
  • Languages: English
  • Source: Build. Serv. Eng. Res. Technol. - vol. 16 - n. 1
  • Publication date: 1995
  • Document available for consultation in the library of the IIR headquarters only.

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