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Optimal Microphone Placement for Single-Channel Sound-Power Spectrum Estimation and Reverberation Effects

The sound power produced by an acoustic source comprises its total sound energy radiated in all directions per unit time. As the global emission, it excites the reverberant field of a surrounding room. Conversely, an acoustic signal detected for audio applications, including driving reverberation effects, often results from a microphone at a discrete location that does not capture the global source sound and its sound-power spectrum. This paper explores several physical bases for how measured high-resolution spherical directivity functions and known room conditions allow audio engineers to optimize a microphone position to yield a signal with a mean-squared spectrum best approximating the time-averaged sound-power spectrum. The proposed approaches provide means to capture the global source sound with its attendant audio benefits, including the production of more realistic reverberation effects.

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JAES Volume 71 Issue 1/2 pp. 20-33; January 2023
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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=22028

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