US 11,990,142 B2
Parameter encoding and decoding
Alexandre Bouthéon, Erlangen (DE); Guillaume Fuchs, Erlangen (DE); Markus Multrus, Erlangen (DE); Fabian Küch, Erlangen (DE); Oliver Thiergart, Erlangen (DE); Stefan Bayer, Erlangen (DE); Sascha Disch, Erlangen (DE); and Jürgen Herre, Erlangen (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed on Dec. 14, 2021, as Appl. No. 17/550,905.
Application 17/550,905 is a continuation of application No. PCT/EP2020/066456, filed on Jun. 15, 2020.
Claims priority of application No. 19180385 (EP), filed on Jun. 14, 2019.
Prior Publication US 2022/0122617 A1, Apr. 21, 2022
Int. Cl. G10L 19/008 (2013.01); G10L 19/08 (2013.01); H04R 3/02 (2006.01); H04S 3/02 (2006.01)
CPC G10L 19/008 (2013.01) [G10L 19/08 (2013.01); H04S 3/02 (2013.01); H04S 2400/01 (2013.01); H04S 2400/03 (2013.01)] 37 Claims
OG exemplary drawing
 
1. An audio encoder for generating a downmix signal from an original signal, the original signal comprising a plurality of original channels, the downmix signal comprising a plural number of downmix channels, the audio encoder comprising:
a parameter estimator configured for estimating channel level and correlation information of the original signal, and
a bitstream writer for encoding the downmix signal into a bitstream, so that the downmix signal is encoded in the bitstream so as to comprise side information comprising channel level and correlation information of the original signal,
wherein the channel level and correlation information of the original signal comprises at least one interchannel level difference, ICLD,
wherein the channel level and correlation information of the original signal encoded in the side information comprises at least correlation information describing energy relationships between at least one couple of different original channels, but less than the totality of the original channels;
wherein the channel level and correlation information of the original signal is in the form of entries of a matrix,
wherein the matrix is symmetrical or Hermitian, wherein the entries of the channel level and correlation information are provided for all or less than the totality of the entries in the diagonal of the matrix and/or for less than the half of the non-diagonal elements of the matrix.