The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 26, 2011
Filed:
Dec. 28, 2006
David C. Copley, Peoria, IL (US);
Benjamin Mahonri Faber, Spanish Fork, UT (US);
Scott D. Sommerfeldt, Mapleton, UT (US);
David C. Copley, Peoria, IL (US);
Benjamin Mahonri Faber, Spanish Fork, UT (US);
Scott D. Sommerfeldt, Mapleton, UT (US);
Caterpillar Inc., Peoria, IL (US);
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.