Apparatus for reducing noise in a closed space having divergence

Details Apparatus for reducing noise in a closed space having divergence Apparatus for reducing noise in a closed space having divergence

1996-10-10

1998-09-15

Kuntz, Curtis A.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

381 711, A61F 1126

Patent

active

058091521

ABSTRACT:
An automatic sound suppression system is automatically disengaged whenever noise in an area and generated counter noise deviate in their reverse phase relationship or if the amplitude of the counter noise deviates from that of the noise. The system can also be automatically disengaged whenever divergence prediction means predicts that sounds of the noise and the counter noise diverge or whenever divergence prediction means predict that sounds of the noise and the counter noise are about to diverge. The system can also operate as a vibration reducing apparatus which is also automatically disengaged whenever divergence prediction means predicts that a vibration and a generated countervibration diverge.

REFERENCES:
patent: 5018202 (1991-05-01), Takahashi et al.
patent: 5029218 (1991-07-01), Nagayasu
patent: 5251262 (1993-10-01), Suzuki et al.
patent: 5426703 (1995-06-01), Hamabe et al.
IEEE Transactions on Acoustics, Speech, and Signal Processing entitled A Multiple Error LMS Algorithm and Its Application to the Active Control of Sound and Vibration, vol. ASSP-35, No. 10, Oct. 1987.

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