3pEA1. Directional microphones for teleconferencing.

Session: Wednesday Afternoon, June 18

Author: Gary W. Elko
Location: Acoust. Res. Dept., Bell Labs, Lucent Technologies, 600 Mountain Ave., Murray Hill, NJ 07974


Directional microphones are spatial filters that can be designed to improve the sound quality of speech in audio telecommunication. At present, the most common type of directional microphone utilized in audio telecommunication is a simple first-order differential microphone having a hypercardioid directivity pattern. The directivity index (microphone gain in isotropic noise) for the hypercardioid microphone is 6 dB. For very noisy and reverberant environments more directional gain will be necessary. This talk will describe and discuss some of the microphone array systems that have been proposed in the last decade that address this problem.

ASA 133rd meeting - Penn State, June 1997