New Insights Into the MVDR Beamformer in Room Acoustics

—The minimum variance distortionless response (MVDR) beamformer, also known as Capon’s beamformer, is widely studied in the area of speech enhancement. The MVDR beamformer can be used for both speech dereverberation and noise reduction. This paper provides new insights into the MVDR beamformer. Specifically, the local and global behavior of the MVDR beamformer is analyzed and novel forms of the MVDR filter are derived and discussed. In earlier works it was observed that there is a tradeoff between the amount of speech dereverberation and noise reduction when the MVDR beamformer is used. Here, the tradeoff between speech dereverberation and noise reduction is analyzed thoroughly. The local and global behavior, as well as the tradeoff, is analyzed for different noise fields such as, for example, a mixture of coherent and non-coherent noise fields, entirely non-coherent noise fields and diffuse noise fields. It is shown that maximum noise reduction is achieved when the MVDR beam...

• Type: Journal
• Year: 2010
• Where: TASLP
• Authors: Emanuël Anco Peter Habets, Jacob Benesty, Israel Cohen, Sharon Gannot, Jacek Dmochowski
• Keywords: MVDR Beamformer, Noise Reduction, Speech Dereverberation, TASLP 2010