Acoustic attenuation device with active double wall

Details Acoustic attenuation device with active double wall Acoustic attenuation device with active double wall

1995-11-02

1997-05-06

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

056278977

ABSTRACT:
An active double wall comprises two parallel plates defining a rectangular space. Four sensors are positioned between the plates so as to detect noises in said space, and four actuators are place between the plates to emit counter-noises in the space. The actuators are phase-controlled by a control unit in order to minimize the sum of the outputs of the sensors. The actuators are respectively positioned at the centers of the sides of the rectangular space, and the sensors are each positioned on a respective long side of the rectangular space at a distance of one quarter of the length of a long side with respect to a respective corner of the rectangular space, or vice-versa.

REFERENCES:
patent: 5024288 (1991-06-01), Shepherd et al.
Journal of the Acoustical Society of America, vol. 92, No. 3, Sep. 1992, "Optimal placement of piezoelectric actuators and polyvinylidene fluoride error sensors in active structural acoustic control approaches"--pp. 1521-1533--R.L. Clark et al.

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