This work describes an activity that led to the realization of a modified NIST Microphone Array MarkIII. This system is able to acquire 64 synchronous audio signals at 44.1 kHz and is primarily conceived for far-field automatic speech recognition, speaker localization and in general for hands-free voice message acquisition and enhancement. Preliminary experiments conducted on the original array had showed that coherence among a generic pair of signals was affected by a bias due to common mode electrical noise, which turned out to be detrimental for time delay estimation techniques applied to co-phase signals or to localize speakers. A hardware intervention was realized to remove each internal noise source from analog modules of the device. The modified array provides a quality of input signals that fits results expected by theory.
Modifications on NIST MarkIII array to improve coherence properties among input signals
AES 2005, 118th Audio Engineering Society Convention, May 28-31, 2005, Barcelona, Spain
Type:
Conférence
City:
Barcelona
Date:
2005-05-28
Department:
Sécurité numérique
Eurecom Ref:
1637
Copyright:
Copyright AES. Personal use of this material is permitted. The definitive version of this paper was published in AES 2005, 118th Audio Engineering Society Convention, May 28-31, 2005, Barcelona, Spain and is available at :
See also:
PERMALINK : https://www.eurecom.fr/publication/1637