Sparse Framework for Reproduction of NFC-HOA

Abstract

In this paper a sparse optimization problem is formulated for reproduction of higher order ambisonics (HOA) encoded signals. The problem is solved using the least absolute shrinkage and selection operator (Lasso). The proposed solution is efficient enough to reproduce the desired sound field with reduced number of loudspeakers. Furthermore, this paper highlights the amplification in the ambisonics components due to the near field effect of the secondary source. The near field compensation(NFC) of HOA encoded signals is carried out to reduce the curvature distortion in the reproduced sound field. Experiments on sound field reproduction using the proposed method are conducted using finite distance loudspeaker arrays. Performance improvements are noted when compared to the standard HOA reproduction techniques in terms of sound field reproduction accuracy and normalized error.