Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming

J. Schmalenstroeer, R. Haeb-Umbach, in: ITG 2018, Oldenburg, Germany, 2018.

Conference Paper | English
Abstract
It has been experimentally verified that sampling rate offsets (SROs) between the input channels of an acoustic beamformer have a detrimental effect on the achievable SNR gains. In this paper we derive an analytic model to study the impact of SRO on the estimation of the spatial noise covariance matrix used in MVDR beamforming. It is shown that a perfect compensation of the SRO is impossible if the noise covariance matrix is estimated by time averaging, even if the SRO is perfectly known. The SRO should therefore be compensated for prior to beamformer coefficient estimation. We present a novel scheme where SRO compensation and beamforming closely interact, saving some computational effort compared to separate SRO adjustment followed by acoustic beamforming.
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ITG 2018, Oldenburg, Germany
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Schmalenstroeer J, Haeb-Umbach R. Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming. In: ITG 2018, Oldenburg, Germany. ; 2018.
Schmalenstroeer, J., & Haeb-Umbach, R. (2018). Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming. In ITG 2018, Oldenburg, Germany.
@inproceedings{Schmalenstroeer_Haeb-Umbach_2018, title={Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming}, booktitle={ITG 2018, Oldenburg, Germany}, author={Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}, year={2018} }
Schmalenstroeer, Joerg, and Reinhold Haeb-Umbach. “Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming.” In ITG 2018, Oldenburg, Germany, 2018.
J. Schmalenstroeer and R. Haeb-Umbach, “Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming,” in ITG 2018, Oldenburg, Germany, 2018.
Schmalenstroeer, Joerg, and Reinhold Haeb-Umbach. “Insights into the Interplay of Sampling Rate Offsets and MVDR Beamforming.” ITG 2018, Oldenburg, Germany, 2018.

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