Subband processing for broadband microphone arrays
Journal of VLSI Signal Processing Systems - Special issue on array optimization and adaptive tracking algorithms
Non-uniform Optimal Subband Beamforming: An Evaluation on Real Acoustic Measurements
CISP '08 Proceedings of the 2008 Congress on Image and Signal Processing, Vol. 5 - Volume 05
IEEE Transactions on Signal Processing
Broadband nearfield beamforming using a radial beampatterntransformation
IEEE Transactions on Signal Processing
Superdirective Beamforming Robust Against Microphone Mismatch
IEEE Transactions on Audio, Speech, and Language Processing
IEEE Transactions on Audio, Speech, and Language Processing
IEEE Transactions on Signal Processing
A Two-Stage Method for the Design of Near-Field Broadband Beamformer
IEEE Transactions on Signal Processing
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Subband beamforming has found many applications in microphone array processing field, due to its advantages over the fullband counterpart. In this paper, the performance of nearfield subband beamformers for arbitrary arrays in the presence of microphone gain and phase errors is studied from the perspective of statistical analysis. Through the bias and variance analysis of array response, some insightful properties on the robustness of nearfield subband beamformers have been derived. It is shown that the robustness of nearfield subband beamformers is dependent on the source-to-array distance, i.e., the robustness will deteriorate when the source is close to microphone arrays. Moreover, the variation in sound speed, i.e., the temperature in homogeneous environments, has little effect on the robustness performance of subband beamformers. The theoretical results are further verified by several numerical examples on nearfield subband beamformers.