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Performance limits in subband beamforming

In English

Författare

  • Sven Nordholm
  • Ingvar Claesson
  • Nedelko Grbic

Summary, in English


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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.

Publiceringsår

2003

Språk

Engelska

Sidor

193-203

Publikation/Tidskrift/Serie

IEEE/ACM Transactions on Audio, Speech, and Language Processing

Volym

11

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Piscataway, NJ : Institute of Electrical and Electronics Engineers

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2329-9290