Method and apparatus for automatic volume control in an...

Details Method and apparatus for automatic volume control in an... Method and apparatus for automatic volume control in an...

2005-03-15

2005-03-15

Woo, Stella (Department: 2643)

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

C381S108000

Reexamination Certificate

active

06868162

ABSTRACT:
An audio system (100) is provided with improved adaptive filter (206) to automatically adjust signal gain depending on the ambient noise level. The original music signal passes through a normalized adaptive filter (206), and is subtracted from the ambient room signal detected by a microphone (120), 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 (100) 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 (124) with a user-friendly interface (400).

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Symetrix—571 SPL Computer User's Guide, dated Mar. 1999.

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