	US 12,112,768 B2
	Post-processing gains for signal enhancement
Xuejing Sun, Beijing (CN); and Glenn N. Dickins, Como (AU)
Assigned to DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
Filed by DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
Filed on Jun. 29, 2023, as Appl. No. 18/344,782.
Application 15/433,437 is a division of application No. 14/384,372, granted, now 9,584,087, issued on Feb. 28, 2017, previously published as PCT/US2013/033251, filed on Mar. 21, 2013.
Application 18/344,782 is a continuation of application No. 17/723,317, filed on Apr. 18, 2022, granted, now 11,694,711.
Application 17/723,317 is a continuation of application No. 17/156,485, filed on Jan. 22, 2021, granted, now 11,308,976, issued on Apr. 19, 2022.
Application 17/156,485 is a continuation of application No. 16/429,552, filed on Jun. 3, 2019, granted, now 10,902,865, issued on Jan. 26, 2021.
Application 16/429,552 is a continuation of application No. 15/433,437, filed on Feb. 15, 2017, granted, now 10,311,891, issued on Jun. 4, 2019.
Claims priority of provisional application 61/618,503, filed on Mar. 30, 2012.
Claims priority of application No. 201210080971.2 (CN), filed on Mar. 23, 2012.
Prior Publication US 2023/0419983 A1, Dec. 28, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H03G 3/00 (2006.01); G10K 11/16 (2006.01); G10L 21/0224 (2013.01); G10L 21/0316 (2013.01); G10L 21/034 (2013.01); G10L 21/0364 (2013.01); G10L 25/78 (2013.01); H03G 3/30 (2006.01); H03G 3/32 (2006.01); H03G 7/00 (2006.01)

CPC G10L 21/0364 (2013.01) [G10K 11/16 (2013.01); G10L 21/0224 (2013.01); G10L 21/0316 (2013.01); G10L 21/034 (2013.01); G10L 25/78 (2013.01); H03G 3/301 (2013.01); H03G 3/32 (2013.01)]

9 Claims

1. An audio processing apparatus, comprising:

at least one processor; and

at least one memory storing a computer program;

in which the at least one memory with the computer program is configured with the at least one processor to cause the audio processing apparatus to at least:

receive at least one audio signal,

analyze the at least one audio signal to determine a raw dynamic range control (DRC) gain, wherein the raw DRC gain depends on a level of the audio signal,

select a raw DRC gain smoothing factor from a plurality of raw DRC gain smoothing factors in response to a comparison of the raw DRC gain to a previous smoothed DRC gain, wherein the plurality of raw DRC gain smoothing factors corresponds to a plurality of raw DRC gain smoothing time durations;

determine, by employing a first order linear smoothing filter, a current smoothed DRC gain from the raw DRC gain, the previous smoothed DRC gain, and the selected raw DRC gain smoothing factor; and

control a dynamic range of the audio signal by applying the current smoothed DRC gain to the audio signal.