Spherical Microphone Arrays for 3D Sound Recording

Author(s):  
Jens Meyer ◽  
Gary W. Elko
Author(s):  
Steve Whitford

The art of location-based Sound Recording specifically, has been a neglected area of academic research.  I seek to address this by drawing critical attention to the intricacies and skills involved in location Sound Recording within single-camera Observational Documentaries (ObsDocs). I show how this art continues to be central to the creative process of production, in driving the narrative and shaping the text’s influence, within the pro-filmic space.I go on to consider the future for location-based Sound Recording within ObsDocs and its place in a new multi-platform, multi-screen consumption space.  Examining a case study, I seek to develop and define a new working methodology and aesthetic for the craft and art, predicated on an anticipated resurgence of the ObsDoc genre, centred around opportunities afforded by the emerging technologies of immersive sound: ambisonic microphone arrays being a vital part of that development. Ambisonics is a method for capturing a full 3D sound field, and its genre-bridging adaptability means it can be converted to a dynamically steerable binaural format. I argue that deploying an ambisonic-centred location Sound Recording methodology, fused with the art of recording unscripted actuality Sound within the pro-filmic geographic event-space, will offer new creative opportunities impacts for ObsDoc makers and crucially, tomorrow’s Documentary audiences. Presenting audiences with an exciting new ability to experience the sense of geographical place and physical event that immersive audio delivers, bears the potential of re-invigorating a content driven ObsDoc market, which once again, will foreground the primacy of neglected storytelling capabilities, in a New consumption World.


2020 ◽  
Vol 10 (3) ◽  
pp. 1033 ◽  
Author(s):  
Pierre Massé ◽  
Thibaut Carpentier ◽  
Olivier Warusfel ◽  
Markus Noisternig

Directional room impulse responses (DRIR) measured with spherical microphone arrays (SMA) enable the reproduction of room reverberation effects on three-dimensional surround-sound systems (e.g., Higher-Order Ambisonics) through multichannel convolution. However, such measurements inevitably contain a nondecaying noise floor that may produce an audible “infinite reverberation effect” upon convolution. If the late reverberation tail can be considered a diffuse field before reaching the noise floor, the latter may be removed and replaced with an extension of the exponentially-decaying tail synthesized as a zero-mean Gaussian noise. This has previously been shown to preserve the diffuse-field properties of the late reverberation tail when performed in the spherical harmonic domain (SHD). In this paper, we show that in the case of highly anisotropic yet incoherent late fields, the spatial symmetry of the spherical harmonics is not conducive to preserving the energy distribution of the reverberation tail. To remedy this, we propose denoising in an optimized spatial domain obtained by plane-wave decomposition (PWD), and demonstrate that this method equally preserves the incoherence of the late reverberation field.


2011 ◽  
Vol 19 (4) ◽  
pp. 1045-1051 ◽  
Author(s):  
Haohai Sun ◽  
Shefeng Yan ◽  
U Peter Svensson

2012 ◽  
Vol 20 (4) ◽  
pp. 1189-1195 ◽  
Author(s):  
Ines Hafizovic ◽  
Carl-Inge Colombo Nilsen ◽  
Sverre Holm

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