Open Access
43- https://doi.org/10.1109/icassp.2002.5743881
Soft constrained subband beamforming for hands-free speech enhancement
- May 1, 2002
- Nedelko Grbic +1 more
Abstract
This paper introduces a new constrained adaptive subband beamformer algorithm for speech enhancement in acoustic telecommunication systems. The solution relies on a pre-calculated source covariance matrix and recursive estimates of background noise- and handsfree signal covariance matrices. The constraint acts as an eye-opening in a vicinity of the near-field location of the source and degradations from steering-vector errors can therefor be made small. The algorithm is applied in subbands using a uniform multi channel over-sampled filterbank. Simulations with real speech recorded in an automobile hands-free environment show 19 dB noise reduction and 20 dB hands-free suppression.
- # Estimates Of Background Noise
- # Subband Beamformer
- # Steering-vector Errors
- # Speech Enhancement
- # Covariance Matrices
- # Covariance Matrix Of Noise
- # Adaptive Beamformer Algorithm
- # Covariance Matrix
- # Matrix Of Noise
- # Covariance Matrix Estimates
