Abstract
This chapter takes a different approach to signal enhancement using spherical microphone arrays: a physically-motivated parametric representation of the sound field is introduced. It is shown that the sound field can be manipulated to achieve noise reduction or dereverberation by applying a time- and frequency-dependent gain to a reference signal. The gain is a simple function of the sound field parameters, which can be estimated using the methods presented in Chap. 5.
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Notes
- 1.
If the real SHT is applied instead of the complex SHT, the complex spherical harmonics \(Y_{lm}\) used throughout this chapter should be replaced with the real spherical harmonics \(R_{lm}\), as defined in Sect. 3.3.
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Jarrett, D.P., Habets, E.A.P., Naylor, P.A. (2017). Parametric Array Processing. In: Theory and Applications of Spherical Microphone Array Processing. Springer Topics in Signal Processing, vol 9. Springer, Cham. https://doi.org/10.1007/978-3-319-42211-4_8
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