This work describes an activity that allowed to realize a modified NIST MarkIII array. This system is able to acquire 64 synchronous audio signals at 44.1 kHz and is primarily conceived for far-field automatic speech recognition and speaker localization. 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.
Authors:
Bertotti, Claudio; Brayda, Luca-Giulio; Cristoforetti, Luca; Omologo, Maurizio; Svaizer, Piergiorgio
Affiliations:
Institut Eurecom; ITC-irst(See document for exact affiliation information.)
AES Convention:
118 (May 2005)
Paper Number:
6488
Publication Date:
May 1, 2005
Session Subject:
Audio Recording and Reproduction; High Resolution Audio; Instrumentation and Measurement
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