US 12,413,927 B2
Efficient head-related filter generation
Tomas Jansson Toftgård, Uppsala (SE); and Rory Gamble, Uppsala (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/014,958
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 7, 2021, PCT No. PCT/EP2021/068729
§ 371(c)(1), (2) Date Jan. 6, 2023,
PCT Pub. No. WO2022/008549, PCT Pub. Date Jan. 13, 2022.
Claims priority of provisional application 63/048,863, filed on Jul. 7, 2020.
Prior Publication US 2023/0336938 A1, Oct. 19, 2023
Int. Cl. H04S 7/00 (2006.01); H04S 1/00 (2006.01)
CPC H04S 7/304 (2013.01) [H04S 1/007 (2013.01); H04S 2400/11 (2013.01); H04S 2420/01 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for generating a head-related (HR) filter for audio rendering, the method comprising:
obtaining shape metadata which indicates whether to obtain a converted version of one or more compact representations of one or more HR filter model basis functions, said compact representations indicating shapes of non-zero parts of said one or more HR filter model basis functions and the converted version of the one or more compact representations being a flipped or mirrored version and/or a sub-sampled version of said compact representations;
obtaining HR filter model basis function shape data which identifies (i) said one or more compact representations of said one or more HR filter model basis functions or (ii) the converted version of said one or more compact representations of said one or more HR filter model basis functions;
based on the obtained shape metadata and the obtained HR filter model basis function shape data, generating the HR filter as a vector which is a weighted sum of one or more HR filter model basis vectors, by an HR filter generator using (i) said one or more compact representations of said one or more HR filter model basis functions and/or (ii) the converted version of said one or more compact representations of said one or more HR filter model basis functions;
obtaining an audio signal; and
using the generated HR filter, filtering the obtained audio signal to generate a left audio signal for a left side or a right audio signal for a right side.