Adaptive microphone array with noise statistics updates

In this paper, we present a new subband adaptive beamformer equipped with noise statistics updates. These updates are employed to effectively estimate and track the noise statistics continuously in the solution. Additionally, an update on the source power spectral density (PSD) is incorporated to enhance the timbre of the source of interest. Furthermore, the beamformer is also equipped with a space constraint on the source area to provide robustness against steering vector errors and good capture of the target signal spatially. The entire processing can be viewed as an efficient combination of weighted spatial and temporal filters. Evaluations on real car data with variations in the car noise level show that the proposed scheme achieves a good noise suppression level up to 20 dB.