Patent ID: 7617109
Filing Date: 2009-11-10
Classification: G10L,H03G

Abstract:
1. A method for correcting playback loudness and dynamic range of audio information, wherein the method comprises steps that: receive an input signal that conveys data representing a first loudness normalization level, a first dynamic range adjustment level and first encoded audio information, wherein the data conveyed by the input signal was produced by an encoding process that generated the first encoded audio information according to psychoacoustic principles and determined the first dynamic range adjustment level in response to audio information amplitude, the first loudness normalization level and a compression profile specifying one or more operational characteristics of a signal compressor; obtain decoded audio information from an application of a decoding process to the input signal; obtain a measure of loudness from an analysis of the decoded audio information and derive a second loudness normalization level from the measure of loudness; obtain an estimate of the compression profile used by the encoding process from an analysis of the decoded audio information and from the first dynamic range adjustment level; generate an output signal that conveys data representing a third loudness normalization level, a third dynamic range adjustment level and third encoded audio information representing the audio information in an encoded form, wherein: