Performance Limits in Subband Beamforming
Blekinge Institute of Technology, Department of Signal Processing2003 (English)In: IEEE transactions on speech and audio processing, ISSN 1063-6676, E-ISSN 1558-2353, Vol. 11, no 3, 193-203 p.Article in journal (Refereed) PublishedAlternative title
Prestandagränser i delbandsbeamforming (Swedish)
This paper analyzes subband beamforming schemes mainly aimed at speech enhancement and acoustic echo suppression applications such as hands-free telephony for both mobile and office environments, internet telephony and video conferencing. Analytical descriptions of both causal finite-length and noncausal infinite-length subband microphone array structures are given. More specifically, this paper compares finite Wiener filter performance with the noncausal Wiener solution, giving a comprehensive theoretical suppression limit. It is shown that even short filters will yield a good approximation of the infinite solution, provided that the element spacing and temporal sampling is matched to the frequency band of interest. Typically, 10-20 FIR taps are sufficient in each subband.
Place, publisher, year, edition, pages
IEEE , 2003. Vol. 11, no 3, 193-203 p.
beamforming, speech enhancement, filterbank, subband, hands-free, microphone array
IdentifiersURN: urn:nbn:se:bth-10188ISI: 000183877300004Local ID: oai:bth.se:forskinfo256625F7182AC017C1256E290036D2FDOAI: oai:DiVA.org:bth-10188DiVA: diva2:838259