Noise reducing device
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United States of America Patent
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Feb 17, 2009
Grant Date -
Jul 21, 2005
app pub date -
May 14, 2004
filing date -
May 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an active control type noise reducing device that is disposed at a sound barrier and with which can be obtained an excellent noise reduction effect with respect to moving sound sources. Linear array of flat loudspeakers are arranged in ascending order from an incoming side of automobiles towards an outgoing side. Delay times of 0, τ, 2τ, . . . , 8τ are respectively given in the arrangement order to the linear array of flat loudspeakers. By delaying signals in correspondence to the arrangement order, the wavefront of a control sound can be slanted in a diagonal direction. Namely, “line sound sources”, where sound sources are linearly arranged, arc pseudo-realized.
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