A Novel and High Performance System for Enhancing Speech in Helmet

Award Information
Agency:
National Aeronautics and Space Administration
Amount:
$99,999.00
Program:
SBIR
Contract:
NNX09CD03P
Solitcitation Year:
2008
Solicitation Number:
N/A
Branch:
N/A
Award Year:
2009
Phase:
Phase I
Agency Tracking Number:
084385
Solicitation Topic Code:
O3.02
Small Business Information
Signal Processing, Inc.
13619 Valley Oak Circle, Rockville, MD, 20850-3563
Hubzone Owned:
N
Woman Owned:
Y
Socially and Economically Disadvantaged:
Y
Duns:
620282256
Principal Investigator
 Chiman Kwan
 Principal Investigator
 (240) 505-2641
 chiman.kwan@signalpro.net
Business Contact
 Chiman Kwan
Title: Business Official
Phone: (240) 505-2641
Email: chiman.kwan@signalpro.net
Research Institution
N/A
Abstract
We propose a highly innovative system for enhancing speech in helmet. First, we propose to apply a circular array with 8 microphones that are inside the helmet. In our past studies, it was found that circular arrays have better directivity than linear arrays. The use of 8 microphones achieves a compromise between performance and complexity. Second, since the speech source and mics are close, we apply proven near-field beamforming to speech acquisition. This will ensure better speech acquisition and high signal-to-noise ratio. Third, we propose to apply latest developments in speech separation to untangle the speech from other background noises. The particular technique is known as Adaptive Decorrelation Filter (ADF) and has been proven to outperform conventional techniques such as Independent Component Analysis (ICA). ADF has strong potential in separating breathing noise from normal speech. Then only the speech segments will be transmitted. The proposed algorithms will be implemented in Field Programmable Gate Array (FPGA) in Phase 2.

* information listed above is at the time of submission.

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