A Novel and High Performance System for Enhancing Speech in Helmet

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$99,999.00
Award Year:
2009
Program:
SBIR
Phase:
Phase I
Contract:
NNX09CD03P
Award Id:
90602
Agency Tracking Number:
084385
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
13619 Valley Oak Circle, Rockville, MD, 20850
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
620282256
Principal Investigator:
Chiman Kwan
Principal Investigator
(240) 505-2641
chiman.kwan@signalpro.net
Business Contact:
Chiman Kwan
Business Official
(240) 505-2641
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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