METHOD AND APPARATUS FOR LOW BIT RATE COMPRESSION OF A HIGHER ORDER AMBISONICS HOA SIGNAL REPRESENTA

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The invention is suited for low bit rate compression of a Higher Order Ambisonics HOA signal representation of a sound field, wherein the HOA signal representation may represent directional signals and a residual ambient component, and wherein the HOA signal representation is spatially sparse due to the low bit rate. From reconstructed signals of said original HOA representation a number of modified phase spectra signals are created using de-correlation filters, which modified phase spectra signals are uncorrelated with the signals of said original representation. The modified phase spectra signals are mixed with each other using predetermined mixing parameters, in order to provide a replicated ambient HOA component. Finally the replicated ambient HOA component is combined with the sparse HOA representation.