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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