US 12,348,952 B2
Head-related (HR) filters
Tomas Jansson Toftgård, Uppsala (SE); and Rory Gamble, Uppsala (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 18/010,749
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Nov. 20, 2020, PCT No. PCT/EP2020/082784
§ 371(c)(1), (2) Date Dec. 15, 2022,
PCT Pub. No. WO2021/254652, PCT Pub. Date Dec. 23, 2021.
Claims priority of provisional application 63/040,112, filed on Jun. 17, 2020.
Prior Publication US 2023/0254661 A1, Aug. 10, 2023
Int. Cl. H04S 7/00 (2006.01); G06F 9/30 (2018.01); G06F 17/16 (2006.01)
CPC H04S 7/305 (2013.01) [G06F 9/3001 (2013.01); G06F 17/16 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for audio signal filtering, the method comprising:
producing an estimated head-related (HR) filter, h′, that consists of a set of S HR filter sections ĥ′s for s=1 to S;
obtaining an audio signal; and
filtering the audio signal using the estimated HR filter, wherein
producing the estimated HR filter comprises:
obtaining an alpha matrix, wherein the alpha matrix consists of S sections, where each one of the sections of the alpha matrix corresponds to a different one of the S HR filter sections, each section of the alpha matrix consists of N sub-vectors, and each sub-vector comprises a number of scalar values; and
computing each one of the S HR filter sections, wherein, for at least a certain one of the S HR filter sections, ĥ′s, the step of computing ĥ′s comprises using a predetermined number, qs, of the sub-vectors within the section of the alpha matrix corresponding to ĥ′s to compute ĥ′s, where qs is less than N, wherein
the method further comprises, for each sub-vector within the section of the alpha matrix corresponding to h′s, determining a metric value for the sub-vector, and
selecting the qs sub-vectors that are used to compute ĥ′s based on the determined metric values.