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3D perceptual soundfield reconstruction via sound field extrapolation

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2020
Erdem, Eg
Perceptual sound field reconstruction (PSR) is a spatial audio recording and reproduction method based on the application of stereophonic panning laws in microphone array design. PSR allows rendering a perceptually veridical and stable auditory perspective in the horizontal plane of the listener, and involves recording using nearcoincident microphone arrays. This thesis extends the two dimensional PSR concept to three dimensions and allows reconstructing an arbitrary sound field based on measurements with a rigid spherical microphone array. This work offers a method for emulating near coincident microphone recordings by using rigid spherical microphone arrays via sound field extrapolation carried out in the spherical harmonic domain. An active-intensity-based analysis of the rendered sound field shows that the proposed approach can render direction of monochromatic plane waves accurately even with a straightforward extension of PSR directivity patterns designed for the 2D case. For the real recordings, listening tests are conducted using multi-channel audio recordings of the reconstructed sound field and compared with higher order Ambisonics recordings.