US 12,248,731 B2
Deferred loudness adjustment for dynamic range control
Frank Baumgarte, Sunnyvale, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 3, 2024, as Appl. No. 18/403,432.
Application 18/403,432 is a continuation of application No. 17/501,839, filed on Oct. 14, 2021, granted, now 11,907,611.
Claims priority of provisional application 63/111,759, filed on Nov. 10, 2020.
Prior Publication US 2024/0143271 A1, May 2, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/16 (2006.01); H04R 3/04 (2006.01)
CPC G06F 3/165 (2013.01) [G06F 3/162 (2013.01); H04R 3/04 (2013.01); H04R 2430/01 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An audio decoder apparatus comprising:
a processor; and
memory having stored therein instructions that configure the processor to obtain 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,
a loudness normalization gain that was applied by the encoder side process when determining the first DRC gain sequence,
an index of the first DRC characteristic, wherein the index identifies or points to the first DRC characteristic, and
an integrated loudness update.