US 12,245,014 B2
Method for and apparatus for decoding/rendering an Ambisonics audio soundfield representation for audio playback using 2D setups
Florian Keiler, Hannover (DE); and Johannes Boehm, Göttingen (DE)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Filed on Aug. 28, 2023, as Appl. No. 18/457,030.
Application 17/231,291 is a division of application No. 16/903,238, filed on Jun. 16, 2020, granted, now 10,986,455, issued on Apr. 20, 2021.
Application 16/903,238 is a division of application No. 16/189,732, filed on Nov. 13, 2018, granted, now 10,694,308, issued on Jun. 23, 2020.
Application 16/189,732 is a division of application No. 15/718,471, filed on Sep. 28, 2017, granted, now 10,158,959, issued on Dec. 18, 2018.
Application 15/718,471 is a division of application No. 15/030,066, granted, now 9,813,834, issued on Nov. 7, 2017, previously published as PCT/EP2014/072411, filed on Oct. 20, 2014.
Application 18/457,030 is a continuation of application No. 17/893,729, filed on Aug. 23, 2022, granted, now 11,770,667.
Application 17/893,729 is a continuation of application No. 17/231,291, filed on Apr. 15, 2021, granted, now 11,451,918, issued on Sep. 20, 2022.
Claims priority of application No. 13290255 (EP), filed on Oct. 23, 2013.
Prior Publication US 2024/0056755 A1, Feb. 15, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04S 3/02 (2006.01); H04R 5/00 (2006.01); H04R 5/02 (2006.01); H04S 5/02 (2006.01); H04S 7/00 (2006.01)
CPC H04S 3/02 (2013.01) [H04S 7/308 (2013.01); H04S 2400/11 (2013.01); H04S 2420/07 (2013.01); H04S 2420/11 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method of rendering an Ambisonics audio signal, the method comprising:
adding one or more virtual loudspeaker positions ΩL+1′ to a set of L loudspeaker positions to determine a new set of L2 loudspeaker positions;
determining a first decode matrix for the new set of L2 loudspeaker positions;
determining a second decode matrix for the set of L loudspeaker positions, wherein the second decode matrix is determined based on at least one coefficient of the first decode matrix, and wherein the second decode matrix is further based on weighting and distributing at least a coefficient for the one or more virtual loudspeaker positions ΩL+1′ based on a weighting factor

OG Complex Work Unit Math
determining a rendering matrix based on a normalization of the second decode matrix, wherein the normalization is based on a frobenius norm; and
rendering the Ambisonics audio signal based on the rendering matrix.
 
3. An apparatus for rendering an Ambisonics audio signal, the apparatus comprising:
a first processor for adding one or more virtual loudspeaker positions ΩL+1′ to a set of L loudspeaker positions to determine a new set of L2 loudspeaker positions;
a second processor for determining a first decode matrix for the new set of L2 loudspeaker positions;
a third processor for determining a second decode matrix for the set of L loudspeaker positions, wherein the second decode matrix is determined based on at least one coefficient of the first decode matrix, and wherein the second decode matrix is further based on weighting and distributing at least a coefficient for the one or more virtual loudspeaker positions ΩL+1′ based on a weighting factor

OG Complex Work Unit Math
a fourth processor for determining a rendering matrix based on a normalization of the second decode matrix, wherein the normalization is based on a frobenius norm; and
a fifth processor for rendering the Ambisonics audio signal based on the rendering matrix.