Broadband beamforming optimization for speech enhancement in noisy environments

Author

Kajala, M. ; Hamaldinen, M.

Author_Institution

Speech & Audio Syst. Lab., Nokia Res. Center, Tampere

fYear

1999

fDate

1999

Firstpage

19

Lastpage

22

Abstract

We have developed a method to optimize the directional sensitivity of a filter-and-sum beamformer. The directivity of the broadband microphone array is optimized by adjusting the spatial transducer positions and the impulse response of the beamformer. We focus on the optimization of 1-dimensional arrays consisting of M omnidirectional microphones and M FIR filters each of length L. The signal sources are assumed to be point sources evenly distributed over a sphere of radius r or over a set of concentric spheres. The target beam pattern for optimization is defined in terms of the desired source signal directions (mainlobe) and the angles for background noise attenuation

Keywords

FIR filters; acoustic noise; acoustic transducer arrays; array signal processing; filtering theory; microphones; optimisation; speech enhancement; transient response; 1D arrays; FIR filters; acoustic interference; angles; background noise attenuation; beam pattern optimization; broadband beamforming optimization; broadband microphone array directivity; concentric spheres; directional sensitivity; filter length; filter-and-sum beamformer; impulse response; mainlobe; noisy environments; omnidirectional microphones; point sources; signal sources; source signal directions; spatial transducer positions; speech enhancement; sphere; Array signal processing; Design optimization; Finite impulse response filter; Frequency; Microphone arrays; Optimization methods; Sensor arrays; Speech enhancement; Telephony; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Signal Processing to Audio and Acoustics, 1999 IEEE Workshop on

Conference_Location

New Paltz, NY

Print_ISBN

0-7803-5612-8

Type

conf

DOI

10.1109/ASPAA.1999.810839

Filename

810839