Noise cancellation system

Details Noise cancellation system Noise cancellation system

1990-08-14

1992-08-18

Isen, Forester W.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

G10K 1116

Patent

active

051406403

ABSTRACT:
This disclosure relates to a self-adaptive noise cancellation system that may be employed in a noise environment at the vicinity of an acoustic noise source to produce noise signals denoted as anti-noise signals that are directed towards a geometric region of the same environment and which counter the first acoustic noise source thus rendering the geometric region relatively quiet. The system monitors the acoustic noise source to identify its signal parameters thus retrieving the noise parameters that are required for the device to tune itself in order to cope with variations in the parameters of the noise source and to adapt its own anti-noise output to keep adequate noise cancellation in said geometric region in the face of the changes in the characteristics of the noise source, such as changes in power or in frequency spectrum of the noise source.

REFERENCES:
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4677676 (1987-06-01), Eriksson
patent: 4677677 (1987-06-01), Eriksson
Time Series Analysis, Identification and Adaptive Filtering; D. Graupe; 2nd Edition, R. E. Krieger Publishing Co., 1989 pp. 25-26, 55-90, 249-251.
The Selection and Application of an IIR Adaptive Filter For Use in Active Sound Attenuation; L. J. Eriksson, et al. IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-35, No. 4, Apr. 1987, pp. 433-437.
Time Series Analysis, Forecasting and Control; G. E. P. Box and G. M. Jenkins Holden-Day Publisher, 1970; pp. 49-67 and 432-437.
Modern Control Theory; K. Ogata Prentice Hall, 1970; pp. 625-631.
Author: Wei Ren and P. R. Kumar--Title: Inter-noise 89; Date: Dec. 4-6, 1989; pp. 435 to 440.

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