Electronic Journal Technical Acoustics ISSN 1819-2408

Allan Kim, Andrey Bykov, Andrey Troshin

Active noise control and noise reduction: practical examples

language: English

received 08.11.2004, published 20.11.2004

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ABSTRACT

The practical examples of ANC (active noise control) systems are shown and discussed in the paper. Examples shown for active noise reduction headsets, noise cancellation in the duct system, general noise reduction using adaptive algorithm are discussed. The efficiency of the active noise control is 10–20 dB for the all cases except of transformer where much more control channels have to be implemented in order to obtain the global reduction of three transformer harmonics. It was shown that global reduction for transformer case could be archived using anti noise loudspeaker and error microphones separated with one half of wavelength.

11 pages, 12 figures

Сitation: Allan Kim, Andrey Bykov, Andrey Troshin. Active noise control and noise reduction: practical examples. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2004, 17.

REFERENCES

1. Nelson P. A., Elliott S. J. Active control of sound. Academic press, 1992.
2. Colin H. Hansen. Understanding active noise cancellation. Spon Press, London and New York, 2001.
3. Sen M. Kuo, Dennis R. Morgan. Active noise control: systems algorithms and DSP implementations. John Wiley and Sons Inc, 1996.
4. Connover W. B., Ringlee R. J. Recent contributions to transformer audible noise control. Transactions of the AIEE, Part III, Power Apparatus and Systems, vol. 74, 77–90.

		Allan Kim - Director of Acoustic solutions department at IT Magic. Co. Ltd. Seoul, Republic of Korea
		Andrey V. Bykov - Project leader and DSP programmer, Acoustic solutions department at IT Magic. Co. Ltd. Seoul, Republic of Korea
		Andrey G. Troshin - PhD, Acoustic expert and team leader, Acoustic solutions department at IT Magic. Co. Ltd. Seoul, Republic of Korea. e-mail: atroshin(at)yahoo.com