Low-noise fume extractor hood
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United States of America Patent
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Nov 29, 2016
Grant Date -
Nov 20, 2014
app pub date -
May 17, 2013
filing date -
May 17, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A fume extractor hood is disclosed, comprising a box with a motor-fan assembly and a muffler module comprising a bearing frame defining an air extraction conduit with axis (A), an active noise suppression system comprising at least one electro-acoustic transducer and at least two microphones, a passive noise suppression system comprising a sound absorbent material. Said muffler module comprises at least two electro-acoustic transducers connected to the walls of said bearing frame, in opposite positions, in such manner to leave the central part of said conduit free. The sound beams coming from said at least two electro-acoustic transducers are mutually combined, obtaining a resulting sound beam that can be directed towards a preferred direction by means of beam forming algorithms.
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