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US 12,010,501 B2Granted
Method and apparatus for decoding stereo loudspeaker signals from a higher-order Ambisonics audio signal
AssigneeDolby International AB
InventorsJohannes Boehm, Florian Keiler
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Abstract
Decoding of Ambisonics representations for a stereo loudspeaker setup is known for first-order Ambisonics audio signals. But such first-order Ambisonics approaches have either high negative side lobes or poor localisation in the frontal region. The invention deals with the processing for stereo decoders for higher-order Ambisonics HOA.
Claims5
A method for decoding a Higher-Order Ambisonics (HOA) audio signal, the method comprising:
- receiving the HOA audio signal;
- determining a matrix G of panning function values, wherein the matrix G contains, for each of a number S of virtual sampling points on a sphere, gain vectors g1 . . . gs, wherein at least a first panning function value for a first virtual sampling point located opposite to a loudspeaker position approaches zero, and at least a second panning function value for a second source located close to the loudspeaker position has a value not approaching zero;
- and
- determining a decoding matrix based on the matrix G;
- and
- rendering, by at least one processor, the HOA audio signal to stereo loudspeaker signals based on the decoding matrix.
3 more elements
An apparatus for decoding a Higher-Order Ambisonics (HOA) audio signal, the apparatus comprising:
- a first receiver configured to receive the HOA audio signal;
- a first processor for determining a matrix G of panning function values, wherein the matrix G contains, for each of a number S of virtual sampling points on a sphere, gain vectors g1 . . . gs, wherein at least a first panning function value for a first virtual sampling point located opposite to a loudspeaker position approaches zero, and at least a second panning function value for a second source located close to the loudspeaker position has a value not approaching zero;
- a second processor for determining a decoding matrix based on the matrix G;
- and
- a renderer for rendering the HOA audio signal to stereo loudspeaker signals based on the decoding matrix.
2 more elements
Dependencies are inferred from the claim text.