DYNAMIC RANGE CONTROL FOR A WIDE VARIETY OF PLAYBACK ENVIRONMENTS

摘要

In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.

主权项

1. A method for dynamic range control (DRC) of audio signals, the method comprising:
receiving, by an audio decoder operating in a specific playback environment different from a reference channel configuration, an audio signal for the reference channel configuration, the audio signal including audio sample data and encoder-generated DRC metadata, the encoder-generated DRC metadata comprising a plurality of sets of DRC gains for a plurality of playback environments, the plurality of sets of DRC gains comprising one or more respective sets of DRC gains for each playback environment in the plurality of playback environments; selecting one or more sets of DRC gains, based on the specific playback environment, from among the plurality of sets of DRC gains for the plurality of playback environments, the one or more sets of DRC gains relating to the specific playback environment; applying the one or more sets of DRC gains as a part of overall gains applied to the audio sample data to the audio sample data to generate output DRC audio data.