DocumentCode :
1866012
Title :
A robust adaptive beamformer for microphone arrays with a blocking matrix using constrained adaptive filters
Author :
Hoshuyama, Osamu ; Sugiyama, Akihiko
Author_Institution :
Inf. Technol. Res. Labs., NEC Corp., Tokyo, Japan
Volume :
2
fYear :
1996
fDate :
7-10 May 1996
Firstpage :
925
Abstract :
This paper proposes a new robust adaptive beamformer applicable to microphone arrays. The proposed beamformer is a generalized sidelobe canceller (GSC) with a variable blocking matrix using coefficient-constrained adaptive digital filters (CCADFs). The CCADFs minimize leakage of target signal into the interference path of the GSC. Each coefficient of the CCADFs is constrained to avoid mistracking. The input signal to all the CCADFs is the output of a fixed beamformer. In a multiple-input canceller, leaky ADFs are used to decrease undesirable target-signal cancellation. The proposed beamformer can allow large look-direction error with almost no degradation in interference-reduction performance and can be implemented with a small number of microphones. The maximum allowable look-direction error can be specified by the user. Simulation results show that the proposed beamformer designed to allow about 20 degrees of look-direction error can suppress interference by more than 17 dB
Keywords :
acoustic transducer arrays; adaptive filters; array signal processing; digital filters; filtering theory; interference suppression; microphones; 17 dB; blocking matrix; coefficient-constrained adaptive digital filters; constrained adaptive filters; generalized sidelobe canceller; interference path; interference-reduction performance; look-direction error; maximum allowable look-direction error; microphone arrays; mistracking; robust adaptive beamformer; target signal; undesirable target-signal cancellation; Adaptive arrays; Adaptive filters; Array signal processing; Degradation; Delay; Information technology; Interference; Laboratories; Microphone arrays; Noise robustness;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on
Conference_Location :
Atlanta, GA
ISSN :
1520-6149
Print_ISBN :
0-7803-3192-3
Type :
conf
DOI :
10.1109/ICASSP.1996.543273
Filename :
543273
Link To Document :
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