US 11,955,130 B2
Layered coding and data structure for compressed higher-order Ambisonics sound or sound field representations
Sven Kordon, Wunstorf (DE); and Alexander Krueger, Burgdorf (DE)
Assigned to DOLBY INTERNATIONAL AB, Amsterdam (NL)
Filed by DOLBY INTERNATIONAL AB, Amsterdam (NL)
Filed on May 19, 2022, as Appl. No. 17/749,007.
Application 16/925,336 is a division of application No. 15/763,830, granted, now 10,714,099, issued on Jul. 14, 2020, previously published as PCT/EP2016/073971, filed on Oct. 7, 2016.
Application 17/749,007 is a continuation of application No. 16/925,336, filed on Jul. 10, 2020, granted, now 11,373,661.
Claims priority of provisional application 62/361,863, filed on Jul. 13, 2016.
Claims priority of application No. 15306591 (EP), filed on Oct. 8, 2015.
Prior Publication US 2022/0284907 A1, Sep. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 15/00 (2013.01); G10L 19/008 (2013.01); G10L 19/24 (2013.01); G10L 19/16 (2013.01)
CPC G10L 19/008 (2013.01) [G10L 19/24 (2013.01); G10L 19/167 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of decoding a compressed Higher Order Ambisonics (HOA) representation of a sound or sound field, the method comprising:
receiving a bit stream comprising the compressed HOA representation, wherein the bit stream comprises a plurality of hierarchical layers that comprise a base layer and one or more hierarchical enhancement layers,
determining a highest usable layer among the plurality of hierarchical layers for decoding;
determining that a parameter CodedVVecLength=2, and based on this determination determining that vector elements 1 to MinNumOfCoeffsForAmbHOA are not transmitted, and that coefficients of predominant vectors corresponding to a number greater than a MinNumOfCoeffsForAmbHOA are specified, wherein a VVecCoeffId array is determined based on MinNumOfCoeffsForAmbHOA;
extracting a HOA extension payload assigned to the highest usable layer, wherein the HOA extension payload includes side information for parametrically enhancing a reconstructed HOA representation corresponding to the highest usable layer, wherein the reconstructed HOA representation corresponding to the highest usable layer is based on of transport signals assigned to the highest usable layer and any layers lower than the highest usable layer;
decoding the compressed HOA representation corresponding to the highest usable layer based on layer information and the VVecCoeffId array, wherein the layer information indicates an active enhancement layer, and wherein the active enhancement layer can be used to determine a number of active directional signals in a current frame of the active enhancement layer; and
parametrically enhancing the decoded HOA representation using the side information included in the HOA extension payload assigned to the highest usable layer.