Method and apparatus for automatic volume control in an audio system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 15, 2005
Grant Date -
N/A
app pub date -
Nov 17, 2000
filing date -
Nov 17, 2000
priority date (Note) -
Expired
status (Latency Note)
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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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