Active sound attenuation system with on-line adaptive feedback c

Details Active sound attenuation system with on-line adaptive feedback c Active sound attenuation system with on-line adaptive feedback c

1985-09-19

1987-06-30

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 731, 381 93, H04R 128, H04B 1500, F01N 106, G10K 1116

Patent

active

046776770

ABSTRACT:
An active acoustic attenuation system (2) is provided for attenuating an undesirable output acoustic wave by introducing a cancelling acoustic wave from an omnidirectional speaker (14) at the output (8), and for adaptively compensating for feedback from the speaker (14) to the input (6) for both broad band and narrow band acoustic waves, without pre-training. The feedback path (20) is modeled with a single filter model (40) adaptively modeling the acoustic system (4) on-line without dedicated off-line pre-training, and also adaptively modeling the feedback path (20) from the speaker (14) to the input microphone (10) on-line for both broad band and narrow band acoustic waves without dedicated off-line pre-training, and outputting a correction signal to the speaker (14) to introduce a cancelling acoustic wave.

REFERENCES:
patent: 4025724 (1977-05-01), Davidson, Jr. et al.
patent: 4473906 (1984-09-01), Warnaka et al.
patent: 4480333 (1984-10-01), Ross
patent: 4489441 (1984-12-01), Chaplin
patent: 4490841 (1984-12-01), Chaplin
patent: 4527282 (1985-07-01), Chaplin
patent: 4562589 (1985-12-01), Warnaka
patent: 4589133 (1986-05-01), Swinbanks
patent: 4589137 (1986-05-01), Miller
patent: 4596033 (1986-06-01), Swinbanks
"Active Noise Reduction Systems in Ducts", J. Tichy, G. E. Warnaka and L. A. Poole, ASME Journal, Nov. 1984, pp. 1-7.
"Historical Review and Recent Development of Active Attenuators", H. G. Leventhall, Acoustical Society of America, 104th Meeting, Orlando, Nov. 1982, FIG. 8.
"Active Adaptive Sound Control in a Duct: A Computer Simulation", J. C. Burgess, Journal of Acoustic Society of America, 70(3), Sep. 1981, pp. 715-726.
"The Implementation of Digital Filters Using a Modified Widrow-Hoff Algorithm for the Adaptive Cancellation of Acoustic Noise", L. A. Poole, G. E. Warnaka and Richard C. Cutter, 1984, IEEE, CH 1945-5/84/0000-0233, pp. 21.7.1-21.7.4.
"VLSI Systems Designed for Digital Signal Processing", Bowen and Brown, vol. 1, Prentice Hall, Englewood Cliffs, New Jersey, 1982, pp. 80-87.
"Comments on `An Adaptive Recursive LMS Filter`", Widrow et al, Proceedings of the IEEE, vol. 65, No. 9, Sep. 1977, pp. 1402-1404, FIG. 2.
Elliot and Nelson, I.S.V.R. Technical Report No. 127, Southampton University, England, published in U.S. Department of Commerce, National Technical Information Service, Bulletin No. PB85-189777, Apr. 1984, pp. 1-61.
Morgan, "An Analysis of Multiple Correlation Cancellation Loops with a Filter in the Auxiliary Path", IEEE Transactions Acoustics Speech, Signal Processing, vol. ASSP-28, No. 4, pp. 454-467.
"Echo Cancellation Algorithms", Gritton and Lin, IEEE ASSP Magazine, Apr. 1984, pp. 30-38.
"Aspects of Network and System Theory", Widrow, Adaptive Filters, edited by R. E. Kalman and N. DeClaris, Holt, Reinhart and Winston, New York, 1971, pp. 563-587.

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