Patent ID: 7848531
Filing Date: 2010-12-07
Classification: H03G

Abstract:
1. A method of adjusting the dynamics of a digital audio track, the method implemented on a computerized system, comprising: evaluating an audio track to determine the loudness levels of a plurality of frames in the audio track such that the loudness levels of the plurality of frames are representative of the loudness distribution of frames across the entire audio track; determining an apparent loudness weighting for the plurality of frames of the audio track such that the weighting emphasizes the relatively greater effect that louder frames have on loudness perception, while including the contribution to overall loudness made by less loud frame; and adjusting the loudness of the track based on the determined loudness levels and apparent loudness weighting of the plurality of frames so that the apparent loudness of the track matches a desired apparent loudness, the adjusting performed via a nonlinear compressor transfer function determined by estimating dynamic spread on the audio track with a calculated non-linear compressor transfer function applied by applying the calculated non-linear compressor transfer function to at least one of histogram or sample frame data.