Anti Spatial Aliasing HOA Encoding Method based on Aliasing Projection Matrix

Abstract

Higher order Ambisonics (HOA) is a 3D sound decomposition and reproduction technology that represent 3D sound fields based on a series of spherical harmonic functions. However, practical application of HOA technology is limited by narrow available bandwidth, low-frequency noise pollution and high-frequency spatial aliasing. Inspired by the sparse recovery method, anti-spatial aliasing HOA encoding method which combines aliasing projection matrix and sparse recovery is presented to obtain better high frequency performance. In this work, we explain the causes of spatial aliasing and propose anti-spatial aliasing HOA encoding method. Then a series of simulations were carried out to verify the effectiveness the proposed method.