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US 5,024,288 AGranted
Sound attenuation apparatus
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsKevin P. Shepherd, Ferdinand M. W. A. Grosveld
Life of this patent
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Abstract
Apparatus for reducing acoustic transmission from mechanical or acoustic sources by means of a double wall partition, within which an acoustic pressure field is generated by at least one secondary acoustic source. The secondary acoustic source is advantageously placed within the partition, around its edges, or it may be an integral part of a wall of the partition.
Claims8
A sound barrier comprising:
- a multiple wall partition positioned between a primary acoustic source producing a first sound of a frequency and a zone wherein the sound of said primary acoustic source is to be attenuated;
- a sound-transmitting medium within said partition;
- and
- at least one secondary acoustic source positioned to generate a second sound within the partition, the second sound having a frequency, magnitude, and phase selected so as to achieve attenuation in said zone.
1 more element
Dependencies are inferred from the claim text.