We recently published a new journal paper from IEEE/ACM Transactions on Audio, Speech, and Language Processing authored by the alimni members of the CAL (Benjamin Yen and Yameizhen Li). The paper proposes a new algorithm to estimate the noise covariance matrix of drone rotor noise, which is an essential information to be used by various signal processing algorithms using microphone arrays. Please have a look at the paper for more details about the study. The link to the paper is here.