Noise reducing device

Details Noise reducing device Noise reducing device

2004-05-14

2009-02-17

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Sound or noise masking

C381S094100, C381S071100, C381S071200, C381S071400, C381S122000, C381S092000

Reexamination Certificate

active

07492911

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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