US 11,838,738 B2
Method and device for applying Dynamic Range Compression to a Higher Order Ambisonics signal
Johannes Boehm, Göttingen (DE); and Florian Keiler, Hannover (DE)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed on Jan. 8, 2021, as Appl. No. 17/144,325.
Application 17/144,325 is a division of application No. 16/857,093, filed on Apr. 23, 2020, granted, now 10,893,372.
Application 16/857,093 is a division of application No. 16/660,626, filed on Oct. 22, 2019, granted, now 10,638,244, issued on Apr. 28, 2020.
Application 16/660,626 is a division of application No. 16/457,135, filed on Jun. 28, 2019, granted, now 10,567,899, issued on Feb. 18, 2020.
Application 16/457,135 is a division of application No. 15/891,326, filed on Feb. 7, 2018, granted, now 10,362,424, issued on Jul. 23, 2019.
Application 15/891,326 is a division of application No. 15/127,775, granted, now 9,936,321, issued on Apr. 3, 2018, previously published as PCT/EP2015/056206, filed on Mar. 24, 2015.
Claims priority of application No. 14305423 (EP), filed on Mar. 24, 2014; and application No. 14305559 (EP), filed on Apr. 15, 2014.
Prior Publication US 2021/0314719 A1, Oct. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04S 3/00 (2006.01); G10L 19/008 (2013.01); H04S 3/02 (2006.01)
CPC H04S 3/008 (2013.01) [G10L 19/008 (2013.01); H04S 3/02 (2013.01); H04S 2420/01 (2013.01); H04S 2420/11 (2013.01)] 6 Claims
OG exemplary drawing
 
6. An apparatus for applying dynamic range compression (DRC) to a Higher Order Ambisonics (HOA) signal in the time domain, the apparatus comprising a processor configured to:
receive the HOA signal and one or more DRC gains gdrc=[g1, . . . , g(N+1)2]T, wherein N is an HOA order of the HOA signal;
apply the one or more DRC gains gdrc to the HOA signal based on:
cdrc=DL−1 diag(gdrc)DLc
where c is a vector of one time sample of HOA coefficients (c∈custom character(N+1)2×1) of the HOA signal, and wherein DL∈custom character(N+1)2×(N+1)2 and its inverse DL−1 are matrices related to a Discrete Spherical Harmonics Transform (DSHT) optimized for DRC purposes; and
render the HOA signal to obtain loudspeaker signals for audio playback by one or more loudspeakers.