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Description
In this paper, a three-dimensional optimal higher-order Ambisonics
encoding (3-D HOA) method, which offers the possibility
to impose spatial stop-bands in the directivity patterns
of all the spherical harmonics while keeping the transformed
audio channels still compatible with the 3-D HOA
reproduction sound format, is introduced. This might be useful
as a post-processing technique for suppressing interfering
signals from specific directions in a 3-D HOA recording. The method is adapted from recent work on the optimization of
spherical microphone array beamforming. The new spherical
harmonics decomposition approach also exhibits its advantage
in improving the resolution of audio source localization.
Numerical simulations and experimental results are
used to evaluate the proposed method.