Patent ID: 11907611
Assignee: APPLE INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A digital audio method comprising:
obtaining a bitstream, the bitstream comprising an encoded version of an audio signal, a first dynamic range control, DRC, gain sequence, that was determined by an encoder side process applying the audio signal to a first DRC characteristic, an index of the first DRC characteristic, wherein the index identifies or points to the first DRC characteristic, and a plurality of instances over time of integrated loudness update;
using the index to obtain an inverse DRC characteristic;
performing loudness normalization after applying the inverse DRC characteristic to the first DRC gain sequence, to produce a normalized loudness sequence;
applying the normalized loudness sequence to a second DRC characteristic to produce a second DRC gain sequence; and
applying the second DRC gain sequence to the audio signal to produce compressed audio.