Active sound reduction apparatus and active noise insulation...

Details Active sound reduction apparatus and active noise insulation... Active sound reduction apparatus and active noise insulation...

2006-07-06

2009-11-03

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

C381S073100, C181S210000

Reexamination Certificate

active

07613307

ABSTRACT:
An active noise insulation wall includes an active sound reduction apparatus disposed on an upper end surface of a noise insulation wall. The active sound reduction apparatus comprises a combination of an active acoustic control cell and a sound tube. The active acoustic control cell controls a coming noise such that a diffracted sound pressure component of the coming noise at the upper end surface of the noise insulation wall is actively reduced. The sound tube decreases a sound wave of a frequency different from a target frequency of the active acoustic control cell. Thus, the active noise insulation wall can effectively reduce noises including many frequency components.

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