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:
Mar. 15, 2005
Filed:
Nov. 17, 2000
Christopher Michael Jubien, Victoria, CA;
Constantine Lakoumentas, Bothell, WA (US);
Brian John Roden, Cobble Hill, CA;
Dale John Shpak, Victoria, CA;
Jeffrey William Sondermeyer, Bothell, WA (US);
Christopher Michael Jubien, Victoria, CA;
Constantine Lakoumentas, Bothell, WA (US);
Brian John Roden, Cobble Hill, CA;
Dale John Shpak, Victoria, CA;
Jeffrey William Sondermeyer, Bothell, WA (US);
Mackie Designs Inc., Woodinville, WA (US);
Abstract
An audio system () is provided with improved adaptive filter () to automatically adjust signal gain depending on the ambient noise level. The original music signal passes through a normalized adaptive filter (), and is subtracted from the ambient room signal detected by a microphone (), resulting in an error signal that is an estimate of the ambient noise. The error signal is used to update a set of adaptation coefficients so that the normalized adaptive filter more accurately simulates the room transfer function, resulting in an better estimate of the ambient noise. The audio system () is calibrated automatically upon initial use to determine adaptation coefficients and noise threshold level to prevent runaway gain. System parameters are adjusted using a controller () with a user-friendly interface ().