Adaptive beamforming by microphone arrays
Zhang Ming, M.H. Er · 2002
In many communication situations, sound is picked up by microphones in a room for recording or transmission to a distant receiver. This paper presents an adaptive beamforming method to extract the desired signal (i.e., the desired talker's signal) from the signals received by microphone arrays in large rooms. The proposed method relaxes the requirement of approximate knowledge of the direction-of-arrival (DOA) of the talker and the microphone channel gains and delays (phases). Also the method can greatly enhance the desired signal based on a focusing transformation only for the desired talker and requires much less computations than the taped-delay-line beamformer, and provides good results even in reverberant environment. Computer simulations are given to support the proposed method.