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US 2011/0079462 A1Published application
Muffling device
AssigneeFujitsu Limited
InventorsHiroyuki FURUYA, Atsushi YAMAGUCHI, Kazuhiro NITTA
Life of this patent
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Abstract
A muffling device has a muffling piece that is placed in an airflow path and muffles sound caused by airflow, and a drive unit that performs one of rotation and movement of the muffling piece.
Claims19
A muffling device comprising:
- a muffling piece that is configured to be placed in an airflow path and muffle sound caused by airflow;
- and
- a drive unit configured to perform one of rotation and movement of the muffling piece.
A muffling device comprising:
- a muffling piece including a surface configured to encounter sound waves, the surface of the muffling piece being displaceable.
A noise-reduction device, comprising:
- a noise reduction unit configured to be disposed in a path of sound waves;
- a drive unit operatively coupled to said noise reduction unit, said drive unit configured to move the noise reduction unit relative to the path of the sound waves.
Dependencies are inferred from the claim text.