3 research outputs found
Limits in FIR subband beamforming for spatially spread near-field speech sources
This paper analyses optimal subband beamforming performance mainly aimed at
speech enhancement and acoustic echo suppression for personal communication
devices, personal computers and wireless cellular telephones.
The focus is on theoretical limits of finite impulse response (FIR) beamformers
for spatially spread sources in the array near-field. Performance of the Wiener
solution is compared to the direct maximization of the array gain for different
lengths of the FIR filters and different source interference spreads. The
evaluation is performed individually in subbands with constant increasing
logarithmic bandwidth. Results show that the difference between the Wiener
solution and the direct array gain maximization is less than 2 dB in the
measure of Signal-to-Noise plus Interference Ratio (SNIR), for small
interference spread. With increasing interference spread the difference in SNIR
performance increases, in favor of the array gain maximization