	US 12,322,404 B2
	Methods and devices for encoding and/or decoding immersive audio signals
David S. McGrath, Rose Bay (AU); Michael Eckert, Ashfield (AU); Heiko Purnhagen, Sundbyberg (SE); and Stefan Bruhn, Sollentuna (SE)
Assigned to DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US); and DOLBY INTERNATIONAL AB, Dublin (IE)
Filed by DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US); and DOLBY INTERNATIONAL AB, Dublin (IE)
Filed on Jul. 10, 2023, as Appl. No. 18/349,427.
Application 18/349,427 is a division of application No. 17/251,913, granted, now 11,699,451, previously published as PCT/US2019/040282, filed on Jul. 2, 2019.
Claims priority of provisional application 62/693,246, filed on Jul. 2, 2018.
Prior Publication US 2024/0005933 A1, Jan. 4, 2024
Int. Cl. G10L 19/16 (2013.01); G10L 19/008 (2013.01); G10L 19/18 (2013.01); H04S 3/00 (2006.01)

CPC G10L 19/167 (2013.01) [G10L 19/008 (2013.01); G10L 19/18 (2013.01)]

1 Claim

1. A method for determining a reconstructed multi-channel signal from coded audio data indicative of a plurality of reconstructed channel signals and from coded metadata indicative of joint coding metadata, the method comprising:

decoding the coded audio data to provide the plurality of reconstructed channel signals forming a K^thorder Ambisonics signal, with K≥1, and decoding the coded metadata to provide the joint coding metadata; and

upmixing the plurality of reconstructed channel signals to an increased number of first upmixed channel signals based on the joint coding metadata, the first upmixed channel signals including an L^thorder Ambisonics signal, with L>K;

applying decorrelation to a selected channel of the K^thorder Ambisonics signal to generate first and second decorrelated signals;

upmixing the first and second decorrelated signals to the increased number of second upmixed channel signals based on the joint coding metadata; and

determining the reconstructed multi-channel signal by summing corresponding channels of the L^thorder Ambisonics signal and the second upmixed channel signals.