Active noise control
Elliott, S.J.; Nelson, P.A.
Signal Processing Magazine, IEEE
Volume 10, Issue 4, Oct 1993 Page(s):12 - 35
Digital Object Identifier 10.1109/79.248551
Summary:Active noise control exploits the long wavelengths associated with
low frequency sound. It works on the principle of destructive
interference between the sound fields generated by the original primary
sound source and that due to other secondary sources, acoustic outputs
of which can be controlled. The acoustic objectives of different active
noise control systems and the electrical control methodologies that are
used to achieve these objectives are examined. The importance of having
a clear understanding of the principles behind both the acoustics and
the electrical control in order to appreciate the advantages and
limitations of active noise control is emphasized. A brief discussion of
the physical basis of active sound control that concentrates on
three-dimensional sound fields is presented
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