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Further Study of Sound Field Coding with Higher Order Ambisonics

Higher Order Ambisonics (HOA) provides a rational and flexible way for spatial encoding, conveying and rendering of 3D sound fields. For this reason it has known a growing interest over past years. Nevertheless, representing near field sources and recording natural sound fields has been addressed only quite recently. This raises the problem of "infinite bass-boost", which a recent approach (NFC-HOA) solves while being fully equivalent with spherical harmonics representation. To better handle problematic cases where bass-boost remains excessive, the present study discusses the actual usefulness of some spatial components depending on the area targeted for sound field reconstruction. Therefore it suggests frequency dependent restriction of spatial resolution by high-passing spatial components. As a particular result, it shows that a much moderated amplification is sufficient to efficiently model sound sources at any distance, and derives a safe and fine solution to simulate sources inside the listening area.

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