Patent ID: 9466302
Filing Date: 2016-10-11
CPC Classification: G10L

Claim Text:
1. A method of compressing multi-channel audio data comprising: performing, by an audio encoder, an energy analysis with respect to each combination of an order and a sub-order to which a plurality of spherical harmonic coefficients representative of the multi-channel audio data correspond to determine an energy volume corresponding to each combination of the order and sub-order, wherein at least one of the plurality of spherical harmonic coefficients has an order greater than one; dynamically determining, by the audio encoder, a threshold for each of the combinations of the order and the sub-order to which the plurality of spherical harmonic coefficients correspond; applying, by the audio encoder, the dynamically determined thresholds to the corresponding energy volumes for each combination of the order and the sub-order to determine whether to eliminate the corresponding combination of the order and the sub-order to which the plurality of spherical harmonic coefficients correspond; eliminating, by the audio encoder, the plurality of spherical harmonic coefficients based on the determination of whether to eliminate the corresponding combination of the order and the sub-order to generate a reduced version of the plurality of spherical harmonic coefficients; and generating, by the audio encoder, a bitstream based on the reduced version of the plurality of spherical harmonic coefficients.