A Robust Adaptive Beamformer with a Blocking Matrix Using Coefficient-Constrained Adaptive Filters

概要

論文の詳細を見る
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 filters (CCAFs). The CCAFs, whose common input signal is the output of a fixed beamformer, minimize leakage of the target signal into the interference path of the GSC. Each coefficient of the CCAFs is constrained to avoid mistracking. In the multiple-input canceller, leaky adaptive filters 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 resuits show that the proposed beamformer, when designed to allow about 20° of look-direction error, can suppress interference by more than 17 dB.
社団法人電子情報通信学会の論文
1999-04-25