Method and apparatus for active noise control of high order mode

Details Method and apparatus for active noise control of high order mode Method and apparatus for active noise control of high order mode

1997-06-10

1998-05-05

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within duct

381 711, A61F 1106

Patent

active

057487502

ABSTRACT:
An active noise control system for effective control of higher order modes of noise propagation within a duct is disclosed. A plurality of error sensors is disposed within an error sensors plane, which plane is perpendicular to the longitudinal axis of the duct. The disclosed process and apparatus minimizes the mean square distance between the points of the area associated to each error sensor. The resulting arrangement of errors sensors optimizes the overall area that the error sensors can control and consequently the global efficiency of the controlling system.

REFERENCES:
patent: 5343713 (1994-09-01), Okabe et al.
patent: 5511127 (1996-04-01), Warnaka
"Vector Quantization in Speech Coding" by John Mahoul, Salim Roucos, and Herbert Gish, Proceedings of the IEEE, vol. 73, No. 77, Nov., 1985, pp. 1551-1557.
"Development of an Active Acoustic Sink (AAS) for Noise Control Applications" by Clark J. Radcliffe, Sachin D. Gogate, and Greg Hall, Active Control of Vibration and Noise (ASME), DE-vol. 75, 1994, pp. 43-50.
"Active Control of Noise Including Higher-Order Acousic Modes Propragating in a Duct" by T. Morishita, C. Yamaguchi, T. Tanaka, M. Taki, and T. Mori, Inter-noise 94, Aug. 29-31, pp. 1372-1376.
"Experimental Modeling of Acoustic Enclosures for Feedback Control Purposes" by David A. Naastad and A. Reza Kashani, Active Control of Vibration and Noise (ASME), DE-vol. 75, 1994, pp. 25-33.

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