Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Counterwave generation control path
Reexamination Certificate
2011-04-26
2011-04-26
Chin, Vivian (Department: 2614)
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Counterwave generation control path
C381S071200, C381S094100
Reexamination Certificate
active
07933420
ABSTRACT:
A method for controlling a noise cancellation system having an adaptive control portion is provided. The noise cancellation system is operable to generate a cancellation noise configured to at least partially cancel an unwanted noise in a defined environment. The adaptive control portion is operable to adjust the operation of the noise cancellation system based on a level of unwanted noise that remains when the cancellation noise and the unwanted noise are combined. The method includes receiving an error signal representing a portion of a noise not cancelled by a cancellation noise, where the cancellation noise is generated from the noise cancellation system. The method also includes determining whether the level of the error signal exceeds a first threshold value for a first predetermined period of time. The method also includes calculating a crest factor using the error signal. The method also includes determining whether the crest factor exceeds a second threshold value. The method also includes deactivating the adaptive control system and continuing to operate the noise cancellation system if the error value exceeds the first threshold value for the predetermined period of time and the crest factor exceeds the second threshold value.
REFERENCES:
patent: 4987598 (1991-01-01), Eriksson
patent: 5251262 (1993-10-01), Suzuki et al.
patent: 5386477 (1995-01-01), Popovich et al.
patent: 5499302 (1996-03-01), Nagami et al.
patent: 5692055 (1997-11-01), Sano et al.
patent: 5699437 (1997-12-01), Finn
patent: 5724432 (1998-03-01), Bouvet et al.
patent: 5768124 (1998-06-01), Stothers et al.
patent: 5809152 (1998-09-01), Nakamura et al.
patent: 6219427 (2001-04-01), Kates et al.
patent: 6266422 (2001-07-01), Ikeda
patent: 6434247 (2002-08-01), Kates et al.
patent: 6522753 (2003-02-01), Matsuzawa et al.
patent: 6594365 (2003-07-01), Eatwell
patent: 7103188 (2006-09-01), Jones
patent: 7106866 (2006-09-01), Astorino et al.
patent: 7248708 (2007-07-01), Vaudrey et al.
patent: 7792312 (2010-09-01), Inoue et al.
patent: 2003/0219132 (2003-11-01), Sommerfeldt et al.
patent: 2004/0052383 (2004-03-01), Acero et al.
patent: 42 00 811 (1993-07-01), None
patent: 197 20 433 (1997-11-01), None
patent: 0 568 292 (1993-11-01), None
International Search Report in PCT/US2007/018508 mailed Sep. 3, 2008. (3 pages).
Written Opinion from the International Searching Authority in PCT/US2007/018508 mailed Sep. 3, 2008. (5 pages).
Hansen, C.H. et al., “Real Time Control of Sound Pressure and Energy Density in a Mining Vehicle Cabin”,Tenth International Congress on Sound and Vibration, Jul. 7-10, 2003, Stockholm, Sweden, pp. 3713-3719.
Faber, B. M., “Active Minimization of Acoustic Energy Density in Enclosed Sound Fields”, (unpublished M.S. thesis), Department of Physics and Astronomy, Brigham Young University, 2004, 73 pages.
Copley David C.
Faber Benjamin Mahonri
Sommerfeldt Scott D.
Caterpillar Inc.
Chin Vivian
Finnegan Henderson Farabow Garrett & Dunner LLP
Kurr Jason R
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