Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate
2006-07-04
2006-07-04
Dorvil, Richemond (Department: 2655)
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
C381S056000, C381S104000, C340S392300, C705S500000
Reexamination Certificate
active
07072477
ABSTRACT:
Automatically normalizing a perceived loudness for a digitally encoded audio track formed of a number of channels during playback on a multimedia asset player is described. A number of auditory selectivity frequency bands are selected and for each channel in the track, a power value for each of the number of selectivity frequency bands is computed. Each of the power values is weighted by a sensitivity weighting factor and a sum value of all the weighted power values is then calculated. For the track, a perceived acoustic power value is calculated based upon the sum value for each of the channels and a normalization gain factor based upon the perceived acoustic power is calculated and associated with the track. During playback, the normalization gain factor is applied to the track.
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Apple Computer Inc.
Beyer Weaver & Thomas LLP
Dorvil Richemond
Sked Matthew J.
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