A microphone array system integrated into computer display using blind processing

摘要

In this paper, a beamforming system using a microphone array integrated into computer display is proposed. This system is divided into three steps. In Step 1, it separates and enhances the signal components by means of the AMUSE (Algorithm for Multiple Unknown Signals Extraction) method. Also a DOA (Direction Of Arrival) information of source which has highest power level is estimated by the DSA (Delay-and-Sum Array) method. In Step 2, the system estimates a DOA of 2nd source, which has second highest power, using the deconvoluted signal components. To prevent so-called permutation problem, the system assigns the separated signal and noise based on the DOA information. In Step 3, the system applies the adaptive notch filter to eliminate the noise component and concatenates the output frames using overlapping method. Results of computer simulations show the effectiveness of the proposed method.