US 11,670,315 B2
System and method for non-destructively normalizing loudness of audio signals within portable devices
Jeffrey Riedmiller, Novato, CA (US); Harald Mundt, Fürth (DE); Michael Schug, Erlangen (DE); and Martin Wolters, Nuremberg (DE)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US); and Dolby International AB, Amsterdam Zuidoost (NL)
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US); and DOLBY INTERNATIONAL AB, Amsterdam Zuidoost (NL)
Filed on May 23, 2022, as Appl. No. 17/750,803.
Application 15/482,328 is a division of application No. 14/525,536, filed on Oct. 28, 2014, granted, now 9,646,622, issued on May 9, 2017.
Application 17/750,803 is a continuation of application No. 16/787,502, filed on Feb. 11, 2020, granted, now 11,341,982.
Application 16/787,502 is a continuation of application No. 16/504,076, filed on Jul. 5, 2019, granted, now 10,566,006, issued on Feb. 18, 2020.
Application 16/504,076 is a continuation of application No. 15/482,328, filed on Apr. 7, 2017, granted, now 10,418,045, issued on Sep. 17, 2019.
Application 14/525,536 is a continuation of application No. 13/576,386, granted, now 8,903,729, issued on Dec. 2, 2014, previously published as PCT/US2011/023531, filed on Feb. 3, 2011.
Claims priority of provisional application 61/303,643, filed on Feb. 11, 2010.
Prior Publication US 2022/0358944 A1, Nov. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 19/22 (2013.01); G10L 19/16 (2013.01); G10L 19/02 (2013.01); H03G 7/00 (2006.01); H03G 3/32 (2006.01); G10L 19/26 (2013.01); H03G 3/30 (2006.01)
CPC G10L 19/22 (2013.01) [G10L 19/02 (2013.01); G10L 19/0208 (2013.01); G10L 19/167 (2013.01); G10L 19/26 (2013.01); H03G 3/3089 (2013.01); H03G 3/32 (2013.01); H03G 7/007 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a decoding device, encoded audio information and metadata associated with an audio signal, the metadata including one or more parameter values specifying dynamic range compression (DRC) according to a first profile associated with a first reference reproduction level, and one or more parameter values specifying DRC according to a second profile associated with a range of reference reproduction levels;
selecting the one or more parameter values specifying DRC according to the second profile when a playback reference reproduction level is within the range of reference reproduction levels associated with the second profile;
applying, by the decoding device, a decoding process to the encoded audio information to obtain decoded subband signals representing spectral content of the audio signal;
modifying, by a degree controlled by the decoding device, the decoded subband signals using the one or more DRC parameter values specifying DRC according to the second profile to obtain modified subband signals, wherein the dynamic range of the modified subband signals is less than the full dynamic range of the decoded subband signals; and
applying, by the decoding device, a synthesis filter bank to the modified subband signals to obtain a decoded audio signal.