A new adaptive differential microphone array

A Simple Adaptive First-Order Differential Microphone

Adaptive Beamforming Using a Microphone Array for Hands-Free Telephony

This thesis describes the design and implementation of a 4-channel microphone array that is an adaptive beamformer used for hands-free telephony in a noisy environment. The microphone signals are amplified, then sent to an A/D converter. The microprocessor board takes the data from the 4 channels and utilizes digital signal processing to determine the direction-of-arrival of the sources and cre...

An adaptive beamforming microphone array system using a blind deconvolution

This paper proposes an adaptive microphone array using blind deconvolution. The method realizes an signal enhancement based on the combination with beamforming using blind deconvolution, synchronized summation and DSA method. The proposed method improves a performance of estimation by the iterative operation of blind deconvolution using a cost-function base on the coherency function.

A steerable and variable first-order differential microphone array

A new rst-order di erential microphone array with an in nitely steerable and variable beampattern is described. The microphone consists of 6 small pressure microphones ush-mounted on the surface of a 3/4" diameter rigid nylon sphere. The microphones are located on the surface at points where included octahedron vertices contact the spherical surface. By appropriately combining the three Cartesi...

Blind Adaptive Dereverberation of Speech Signals Using a Microphone Array

This paper describes a blind adaptive method for the dereverberation of speech/audio signals in a closed room environment based on the use of multiple microphones (two or more) by utilizing the second-order statistics of the reverberated speech signals only. The spatial diversity provided by the microphone array creates the equivalent of multiple channels, where each channel is the impulse resp...