Abstract
The encoding of spatial sound fields captured by spherical microphone arrays into Eigenbeams (HOA signals) provides a compact representation of the sound field that facilitates spatially realistic audio playback in Higher-Order Ambisonics (HOA) applications. For spatial audio reproduction, a typical Ambisonics decoder generates the loudspeaker signals from the HOA signals by applying only simple scalar weights. However, since the HOA signals derived from physical microphone arrays are frequency dependent, such a frequency independent scalar weighting scheme will not result in the desired loudspeaker sound field reproduction. An analysis of this frequency dependency and some equalization schemes to mitigate detrimental effects resulting from frequency independent loudspeaker decoding will be discussed.
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