US 9,852,737 B2 · Coding vectors decomposed from higher-order ambisonics audio signals

Abstract

In general, techniques are described for coding of vectors decomposed from higher order ambisonic coefficients. A device comprising a processor and a memory may perform the techniques. The processor may be configured to obtain from a bitstream data indicative of a plurality of weight values that represent a vector that is included in a decomposed version of the plurality of HOA coefficients. Each of the weight values may correspond to a respective one of a plurality of weights in a weighted sum of code vectors that represents the vector and that includes a set of code vectors. The processor may further be configured to reconstruct the vector based on the weight values and the code vectors. The memory may be configured to store the reconstructed vector.

Claims21

Dependent claims

A method of obtaining a plurality of higher order ambisonic (HOA) coefficients representative of a soundfield, the method comprising:

obtaining, by an audio decoder and from a bitstream data indicative of a plurality of weight values that represent a vector, each of the weight values corresponding to a respective one of a plurality of weights in a weighted sum of code vectors used to represent the vector, the vector defined in a spherical harmonic domain, and representative of a directional component of an corresponding audio object present in the soundfield represented by the plurality of HOA coefficients;
obtaining, from the bitstream and by the audio decoder, data indicative of which of a plurality of code vectors to use for reconstructing the vector;
selecting, by the audio decoder, a subset of the code vectors based on the data indicative of which of the plurality of code vectors to use for reconstructing the vector;
reconstructing, by the audio decoder, the vector based on the weight values, and the selected subset of the code vectors;
and
rendering, by the audio decoder and based on the reconstructed vector, loudspeaker feeds for playback by loudspeakers to reproduce the soundfield.

3 more elements

A device configured to obtain a plurality of higher order ambisonic (HOA) coefficients representative of a soundfield, the device comprising:

one or more processors configured to:
obtain from a bitstream data indicative of a plurality of weight values that represent a vector, each of the weight values corresponding to a respective one of a plurality of weights in a weighted sum of code vectors used to represent the vector, the vector defined in a spherical harmonic domain, and representative of a directional component of an corresponding audio object present in the soundfield represented by the plurality of HOA coefficients;
obtain, from the bitstream, data indicative of which of a plurality of code vectors to use for reconstructing the vector;
select a subset of the code vectors based on the data indicative of which of a plurality of code vectors to use for reconstructing the vector;
reconstruct the vector based on the weight values, and the selected subset of the code vectors;
and
render, based on the reconstructed vector, loudspeaker feeds for playback by loudspeakers to reproduce the soundfield;
and
a memory coupled to the one or more processors, and configured to store the reconstructed vector.

6 more elements

A device configured to obtain a plurality of higher order ambisonic (HOA) coefficients, the device comprising:

means for obtaining from a bitstream, data indicative of a plurality of weight values that represent a vector, each of the weight values corresponding to a respective one of a plurality of weights in a weighted sum of code vectors used to represent the vector, the vector defined in a spherical harmonic domain, and representative of a directional component of an corresponding audio object present in the soundfield represented by the plurality of HOA coefficients;
means for obtaining, from the bitstream, data indicative of which of a plurality of code vectors to use for reconstructing the vector;
means for selecting a subset of the code vectors based on the data indicative of which of the plurality of code vectors to use for reconstructing the vector;
means for reconstructing the vector based on the weight values, and the selected subset of the code vectors;
and
means for rendering, based on the reconstructed vector, loudspeaker feeds for playback by loudspeakers to reproduce the soundfield.

3 more elements

Dependencies are inferred from the claim text.

Coding vectors decomposed from higher-order ambisonics audio signals

Life of this patent

Coding vectors decomposed from higher-order ambisonics audio signals

Life of this patent

Abstract

Claims21