ABSTRACT: This paper describes the design and implementation of a 5-channel microphone array that is an adaptive beamformer used for hands-free telephony in a noisy environment. The microphone signals are amplified, and then sent to an A/D converter. The microprocessor board takes the data from the 5 channels and utilizes digital signal processing to determine the direction-of-arrival of the sources and create an output which ′steers′ the microphone array to the desired look direction while trying to minimize the energy of interference sources and noise.
IETE Technical Review. 01/2007;