Patent ID: 7072477

Claim:
A method for automatically normalizing a perceived loudness for a digitally encoded audio track formed of a number of channels during playback on a multimedia asset player, comprising selecting a number of auditory selectivity frequency bands; computing a power value for each of the number of selectivity frequency bands for each channel in the audio track; weighting each of the power values by a sensitivity weighting factor for each channel in the audio track; calculating an average sum value of all the weighted power values for each channel in the audio track; calculating a perceived acoustic power value based upon the average sum value for each of the channels by determining a maximum average sum value for all channels and dividing the maximum average sum for all channels by a power scale factor used to map the perceived acoustic power value to a predefined range for the audio track; calculating a normalization gain factor based upon the perceived acoustic power for the audio track; associating the normalization gain factor with the audio track; and applying the normalization gain factor to the track during playback.