Patent ID: 11895482
Assignee: DOLBY LABORATORIES LICENSING CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 2:
3. An apparatus for decoding encoded higher order ambisonics (HOA) signals describing a sound field, the apparatus comprising:
a receiver for obtaining a bit stream containing the encoded HOA signals and metadata indicating a production screen size;
a processor for determining the production screen size from the metadata;
an audio decoder for decoding the encoded HOA signals to obtain a first set of decoded HOA signals representing dominant components of the sound field and a second set of decoded HOA signals representing ambient components of the sound field;
a combiner for integrating the first set of decoded HOA signals and the second set of decoded HOA signals to produce a combined set of decoded HOA signals; and
a processor for determining a transformation matrix for warping the combined set of decoded HOA signals, wherein the transformation matrix is based on the production screen size and a target screen size, and wherein the transformation matrix is further based on a diagonal matrix of loudspeaker correction gains.