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A Second-Order Ambisonics Device Using Velocity Transducers

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The second-order components of a spherical harmonics expansion of the sound pressure field can be obtained by means of velocity transducers based on hot-wire anemometry. Such velocity transducers are small compared to acoustic wavelengths and can be mounted on a tiny rigid bar only a few millimeters wide, thereby reducing the effects of wave diffraction and acoustic shadows. Numeric simulations and experimental tests using two Microflown pressure-velocity transducers validate the proposed approach.

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JAES Volume 59 Issue 9 pp. 656-668; September 2011
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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=15981

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