US 12,170,882 B2
Audio processing for adaptive loudspeaker stereo widening
Sampo Vesa, Helsinki (FI); Mikko-Ville Laitinen, Espoo (FI); and Jussi Virolainen, Espoo (FI)
Assigned to NOKIA TECHNOLOGIES OY, Espoo (FI)
Appl. No. 17/293,723
Filed by NOKIA TECHNOLOGIES OY, Espoo (FI)
PCT Filed Nov. 8, 2019, PCT No. PCT/FI2019/050795
§ 371(c)(1), (2) Date May 13, 2021,
PCT Pub. No. WO2020/099716, PCT Pub. Date May 22, 2020.
Claims priority of application No. 1818690 (GB), filed on Nov. 16, 2018.
Prior Publication US 2022/0014866 A1, Jan. 13, 2022
Int. Cl. H04S 7/00 (2006.01); H04R 5/04 (2006.01); H04S 1/00 (2006.01)
CPC H04S 7/303 (2013.01) [H04R 5/04 (2013.01); H04S 1/002 (2013.01); H04S 7/307 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus for processing an input audio signal comprising a multi-channel audio signal, the apparatus comprising at least one processor; and at least one memory including computer program code, which when executed by the at least one processor, causes the apparatus to:
derive, based on the input audio signal, a first signal component comprising a multi-channel audio signal that represents a focus portion of a spatial audio image conveyed by the input audio signal and a second signal component comprising a multi-channel audio signal that represents a non-focus portion of the spatial audio image, wherein the first signal component comprises coherent sounds of the input audio signal with a predefined focus range and the second signal component comprises (i) coherent sounds that are outside the predefined focus range and (ii) non-coherent sound sources;
process the first signal component into a modified first signal component such that one or more sound sources represented by the first signal component are repositioned in the spatial audio image in dependence on one or more of a target loudspeaker configuration and an output loudspeaker configuration;
process the second signal component into a modified second signal component wherein a width of the spatial audio image is extended from that of the second signal component; and
combine the modified first signal component and the modified second signal component into an output audio signal comprising a multi-channel audio signal that represents a partially extended spatial audio image.