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Horizontal 3D sound field recording and 2.5D synthesis with omni-directional circular arrays

Citation Author(s):
Takuma Okamoto
Submitted by:
Takuma Okamoto
Last updated:
10 May 2019 - 3:08am
Document Type:
Document Year:
Takuma Okamoto
Paper Code:

Although 2.5D sound field synthesis with a circular loudspeaker array can be used in a 3D sound field, a 2D sound field, instead of a 3D sound field, is assumed for a sound field recording with a circular microphone array. This paper presents a horizontal 3D sound field recording and 2.5D synthesis method used in 3D sound fields with multiple co-centered omni-directional circular microphone arrays and a circular loudspeaker array without vertical derivative measurements. The spherical harmonic spectrums used for 2.5D synthesis are extracted from the recorded horizontal sound pressures and the driving function of a circular sound source is analytically derived based on 2.5D higher-order Ambisonics. The results of computer simulations indicate the effectiveness of the proposed method, in comparison with the conventional least squares-based pressure matching, and 2D cylindrical harmonic analysis-based approaches.

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